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Fix My Compressor

Buying, using and fixing your air compressor

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Central Pneumatic Air Compressor

If you have a Central Pneumatic air compressor, and you didn’t buy it used, from a garage sale, or from on on-line end-of-line wholesaler, odds are pretty good that you bought it at Harbor Freight.

In 2017, Harbor Freight offers about 35 different Central Pneumatic air compressors, from a 1/6 HP air brush style to a 5 HP, almost commercial type, on a 60 gallon air tank. They even have one model of a gas-powered, wheelbarrow style, that is quite well priced.

Central Pneumatic air compressors can be purchased through Harbor Freight on-line, or at the many Harbor Freight stores found throughout the United States.

 

Central Pneumatic air compressors - www.fix-my-compressor.com
Central Pneumatic Air Compressor – Photo: HarborFreight.com

Buyers of Central Pneumatic air compressors are, pretty much I think, aware that you get what you pay for. This line of compressors is entry level. I don’t believe they are made for serious compressed air use, where whether or not a compressor works means that trades persons do or don’t do work that day.

Which is not to say, if you are a periodic user of compressed air – the typical small workshop or home garage for example – you won’t be happy with this brand of compressors reliability. I just wouldn’t put the supply of my plants air system at the mercy of this particular brand.

While Harbor Freight boasts of having manufacturing around the world, I would be surprised if they actually owned a factory that makes air compressors. Their entire line is similar or identical to compressors of other brands with different colors and different labels. I could be wrong and will be happy to indicate so if someone can provide proof that HF actually makes their own compressors.

Regardless of whether they make them or not, try to find parts for a Central Pneumatic air compressor. Aside from pressure switches, gauges, regulators, PRV’s and check valves (all the same as those found on many other brands) there are very few repair parts for the compressor pump or the motor. Parts from other Central Pneumatic air compressors can often be used on other models of this brand. If you can scrounge or buy a non-working compressor, some parts from the old can be reused to fix others that have failed. Depends on your skill level as to whether or not this works for you.

If you are having a problem with your Central Pneumatic air compressor why not add a question or comment here? Include the model number of your compressor. As a result, perhaps the Central Pneumatic air compressor owner/user family, which is a huge one, can offer advice as some of them will, undoubtedly, already dealt with the same problem you are experiencing with your HF Central Pneumatic air compressor.

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monk
January 10, 2021 1:19 pm

Hello levi
I took the piston out of a twin tank 3hp peak air compressor model 42321 and now I am waiting for the 3 piston rings to come from in the mail. I cleaned the piston and the cylinder and decided to do this due to low air compression. Anyways I was wondering if you can accidently put the cylinder in wrong after reinstallation, I looked at some other utubes for info on on to do it. But I figure if you put it in wrong, you might as well not have bought it. Thanks

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Levi Cole
December 31, 2020 5:52 pm

I gave a 1/3HP 3 Gal 100 max psi brand Central Pneumatic. I cannot get it to run more than a second because it keeps blowing fuses. Haven’t had it for long, everything electrical is tight still. Any ideas?

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Author
Fix My Compressor Moderator
January 1, 2021 11:38 am
Reply to  Levi Cole

Hello Levi. Tell me about where and how you’ve got the compressor plugged in. Are you using an extension cord? If so, what gauge is it? Also, is the circuit powering the compressor a breaker or fuse, and what amperage is it? Thanks.

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Jim
January 1, 2021 7:50 pm
Reply to  Fix My Compressor Moderator

Is the tank empty when you try to start it up or is it a full tank

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Gerald O Peterson
December 31, 2020 5:02 pm

I bought a Central air compressor, 1.5 HP, 6 gallon, Item #62380, from Harbor Freight in late 2017 for $100. While it still works, it has developed a serious air leak. When pumped up to full pressure, it will go to zero in about 1 hour. I can actually hear the air leaking inside the black plastic cowling. If I could remove the cowling, I could probably stop the leak. I cannot figure out how to remove the cowling. Please advise.

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Author
Fix My Compressor Moderator
January 1, 2021 11:35 am
Reply to  Gerald O Peterson

Harbor Freight 62380 air compressor

Gerald, I’ve uploaded an image of what I believe your 62380 compressor looks like. I hope I’m close.

The cowling is attached by the socket screws shown in this diagram:

Central-air-compressor-1.5-HP-6-gallon-Item-62380-assembly-drawing

These are (item 12) M6 x 25 mm socket had cap screws. You’ll need a metric allen type key to remove them.

Item #4 is the tank check valve. I suspect you’ll find, when you get under the cover, that the check valve is the culprit. It can be cleaned or replaced if in fact it is.

Here is the Harbor Freight – Central Pneumatic 62380 air compressor manual for your reference. Good luck.

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Lonnie
December 26, 2020 6:47 pm

Central Pneumatic 3 Gallon oil-less pancake air compressor: HF Item 60637, which
I purchased a few days ago. I filled it with air and carried out to put air in the golf cart tires. When I sat it down on the ground, the schrader air valve popped open releasing a blast of air. I quickly pushed closed. I moved the tank to the other side of the golf cart & when I sat it on the ground, the air valve popped open again. Have you ever heard of such things happening with this tank or any other tank? Is it faulty? Should I return it for an exchange? I await your advice. Thanks

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Author
Fix My Compressor Moderator
December 27, 2020 8:22 am
Reply to  Lonnie

Hi Lonnie. The valve you refer to as the Schrader air valve is, I suspect, the compressor pressure relief valve seen on the left of the housing when looking straight on at the compressor.

I believe this compressor has a 100 PSI upper limit, which means the compressor should shut off at 100 PSI. The question then is, at what pressure is the PRV cracking open to spill air from the system? Please advise as a comment here. Thanks.

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Jchapman
December 20, 2020 11:49 am

17 gallon 150 psi Broke rod and messed sleeve up, what parts interchange or where can you get replacements

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Author
Fix My Compressor Moderator
December 20, 2020 2:56 pm
Reply to  Jchapman

Hi JChapman. It will be difficult for sure to find parts if we don’t know the model number of this Central Pneumatic compressor. If you have the manual, that should show the model number. If not, can you look around on the compressor and see if you can find something that identifies yours? Central Pneumatic / Harbor Freight sell an awful lot of small air compressors. Thanks.

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Jchapman
December 23, 2020 8:52 pm
Reply to  Fix My Compressor Moderator

63132. It’s a 1.8 hp 150 psi 17 gallon air compressor. Need connecting rod, piston, sleeve

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Author
Fix My Compressor Moderator
December 24, 2020 10:15 am
Reply to  Jchapman

Like yourself I’ve searched and found none of the spares you seek. When I look at the manual for this compressors, in the manual parts section, it doesn’t even list these parts. Unfortunately, that tells me that HF deems this as a disposable pump, and either you buy a replacement or… if you look at the specs, you can acquire a different brand for around $75 dollars, and either use the new or use the pump from it to fill the larger tank on your compressor. Or… start scouring the for sale sites near you and see who’s got a brand of compressor for sale used that might suit.

That, or hope that another reader can advise where to get the parts you need. Sorry I couldn’t be of more help.

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Alfred Branche
November 9, 2020 11:52 am

My air compressor is blow all the air out the safety valve when started up.

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Author
Fix My Compressor Moderator
November 9, 2020 5:38 pm
Reply to  Alfred Branche

If the safety valve has a piston with a ring on it on the end, push that piston back in. If it pops open on start up, then the PRV will either need a good cleaning or replacing.

If it’s not that, add a comment with a picture of the safety valve on your compressor. Thanks.

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Steve
November 8, 2020 8:22 pm

How do you change the belt on a 62629? Impossible!

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Jack
November 2, 2020 7:16 pm

Hi, I have a CP model 61693 2.5 HP 21 gal. tank. It has worked great for several years to seasonally change my snow tires and inflate my pontoon boat. Now though, it’s only filling to about 90 PSI and just keeps running (should go to 125 then shut off). Any advice/suggestions are appreciated. Thanks!

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Author
Fix My Compressor Moderator
November 7, 2020 4:51 pm
Reply to  Jack

Jack, this compressor is oil lubed. Check the vent in the oil fill cap to see if a lot of air is blowing out that vent. If so, you’re looking a new piston ring for sure. If you wish, while the head of the compressor is off – as that what you’ll have to do next after dumping all the air – replace any head gaskets and check the valves in the pump head to be sure that they are sound.

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Jack
November 7, 2020 11:28 pm
Reply to  Fix My Compressor Moderator

Thanks Willyr! I got lucky and found a loose fitting where the air was leaking. A quick tightening of the nut and all is well again!

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Chuck Gribble
October 22, 2020 1:47 pm

3 gallon pancake started giving off an acrid, burning electrical odor after a year of off and on use. Now won’t start at all. No trouble shooting advice anywhere seems to refer to this.

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Author
Fix My Compressor Moderator
October 23, 2020 10:03 am
Reply to  Chuck Gribble

The acrid burning smell suggests the motor. Don’t know if that compressor motor has windings, but it may be that a short has caused the issue. Diagnosing that on a motor is beyond the ken of most, and it may require getting a pro’s help. That will cost as much as the compressor, I would suspect. Good luck.

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Rachel
October 19, 2020 2:19 pm

I just got the 3 gallon oil less pancake compressor. Is there a way to lengthen the amount of time it will run between refills? I’m in a small room using it for art and it o my has a 20 of pressure difference between full and needing to refill. Can I adjust that down a bit so it doesn’t refill as often?
Thanks
Rachel

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Author
Fix My Compressor Moderator
October 20, 2020 12:09 pm
Reply to  Rachel

The first step, if you haven’t done so already, is to dial down the pressure on the regulator to the lowest pressure setting that will work for you.

The next step is to take a photo of the parts page that shows what pressure switch this model of compressor has, as if we can’t see it, we don’t know if it’s adjustable. Please add a photo in your response to this thread.

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Scott Bickford
October 17, 2020 11:26 am

I have a Central Pneumatic 67696 150 psi 6 gal. Have had for years and been pretty good. Now when pressure gets up to 150 psi in tank, PRV let’s go and it never shuts down. Only way I can use it is to shut off compressor once pressure gets up to 130 or so. Is this a faulty PRV? A fiend told me some tube which signal compressor to shut off might be kinked or need to be replaced. I’m not too mechanical but can follow You tube to fix something. Appreciate any advice!

Last edited 2 months ago by Scott Bickford
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Author
Fix My Compressor Moderator
October 17, 2020 5:54 pm
Reply to  Scott Bickford

Is 150 PSI the normal cut out pressure, or is it lower? If the normal cut out pressure is 10-15 PSI below the 150 PSI where the PRV is letting go, it’s quite possible the pressure switch that’s failed. If 150 PSI is the normal cut out, and the PRV is letting go at that pressure, then it’s quite possibly the PRV.

Dump all the air with the compressor off, remove the PRV, rinse it in thinner or boiling water, dry, and test again. If it is still cracking open at or before the normal cut out of the compressor, replace it.

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Scott Bickford
October 18, 2020 8:36 pm
Reply to  Fix My Compressor Moderator

Thank you Willyr! It’s supposed to cut out at 150psi. I’ll try removing and cleaning the safety valve and if that doesn’t work, replacing it. Appreciate the advice very much!

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Author
Fix My Compressor Moderator
October 19, 2020 8:47 am
Reply to  Scott Bickford

You are welcome, and let us know how it turns out, will you?

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Scott Bickford
October 19, 2020 2:20 pm
Reply to  Fix My Compressor Moderator

I decided to buy a new safety PRV and replace. The new PRV works “better” as it blows at about 155psi and the closes back at 120psi. The old one would just stay open until the tank drained. So I’m guessing my problem is the pressure switch not shutting off the compressor at 150psi. Don’t have the tools to get the cover off so guessing I’m stuck with what I have or bring it somewhere to have it repaired. Or find the right tool (8″ or so drive to reach hex head I’m guessing?). Thanks again for the help!

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Author
Fix My Compressor Moderator
October 20, 2020 12:12 pm
Reply to  Scott Bickford

There’s a bunch of comments and posts on this site about getting the covers off low end compressors. If you use the search function at the top of the nav column, you’ll find them. And yes, often the hex bolt is metric in size and needs an extra long wrench to reach the head.

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Mike
October 16, 2020 5:27 pm

My model 95275 3 gal compressor won’t start. Is there a fuse?
It had worked fine for years but today I plugged it in and nothing .

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Author
Fix My Compressor Moderator
October 17, 2020 8:36 am
Reply to  Mike

Mike, you need to do a few checks. When you do, please add a comment. Not sure which? Try these pages, all found linked from the compressor troubleshooting page on this site.
air compressor will not start
air compressor cycles on and off all the time
air compressor just hums
air compressor will not start when cold
compressor trips the breaker when restarting
compressor will not restart when air is used

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Darrell Galloway
September 22, 2020 8:39 am

I have a 9gal wheelbarrow type and it suddenly started shutting down once it reached top pressure instead of throttling back to idle and cycling on and off. Found the pilot valve shaft was slightly bent and replaced that, but it is still shutting down. I’m now wondering if it’s something to do with the throttle control.

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Author
Fix My Compressor Moderator
September 22, 2020 1:27 pm
Reply to  Darrell Galloway

I’m no expert when it comes to gasoline powered air compressors Darrell, yet it certainly makes sense that if, instead of throttling down to idle when the tank is full, the Central Pneumatic compressor (what model is this, by the way?) shuts down.

Please identify the model number, and add a photo of the compressor in your response to this please.

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Victor Cardoza
September 17, 2020 4:34 pm

Bought a 1/3 HP hot dog compressor Central neumatic from HF store used 6 times to fill pool toys and my car tire; Now it does not build pressure, never again will I get Peumatic Comp again ; I guess you really get what you pay for.

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Author
Fix My Compressor Moderator
September 17, 2020 7:21 pm
Reply to  Victor Cardoza

Mostly, huh? B.

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Noah Kamper
August 17, 2020 2:11 pm

trying to find a replacement tube, the one from motor to tank that has compression ring on either end. mine sheared off after I attempted to tighten the nut. what kind of store sells aluminum or better yet copper flexible tube and compression rings? 3gal 100psi pancake

tube.jpg
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Author
Fix My Compressor Moderator
August 17, 2020 3:47 pm
Reply to  Noah Kamper

I suspect that if you took the fittings and the tube to a good industrial plumbing or compressed air supply shop, or an auto parts supply shop, they’ll be able to fix you up with a custom one, made for the compressor.

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We live in Braselton ga is there someplace I can t
August 14, 2020 6:48 pm

The air outlet that attaches to the hose broke off
Thanks
Howard

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Author
Fix My Compressor Moderator
August 16, 2020 3:01 pm
Reply to  We live in Braselton ga is there someplace I can t

Howard, I call that outlet the discharge coupler, if I’m guessing right about what you are talking about. Please see this page: https://fix-my-compressor.com/connecting-your-air-tools/.

If you go to the hardware store where you buy pneumatic stuff, you can get coupler and connector kits there. They are usually under $20. Remove the broken part of the old coupler, install a new one, and if it fits the connectors you have that’s good (it probably will) but if not, replace the connectors with ones from the new kit as they will be compatible.

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Andrew Kramer
August 9, 2020 4:51 pm

My grandfather recently bought a 2.5 HP 21 Gallon compressor and forgot to put the oil in for initial use seizing the compressor. I since then have gotten the compressor running although it will only occasionally build pressure, and even then it only gets to about 20 PSI. I took the top of the cylinder off and the small metal plates now refuse to stay in place. Is there something else I need to do to get it back working or should I just replace the compressor with another that I have?

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Author
Fix My Compressor Moderator
August 10, 2020 8:24 am
Reply to  Andrew Kramer

While I cannot see the compressor or the “plates” (flapper or finger valves I suspect) it sounds as though heat may have warped them. Find parts or trash the compressor? Depends on how much time you want to spend, parts cost if you can find them, and the urgency, I guess. Good luck.

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Aurelio Salazar
August 4, 2020 9:38 pm

I have the 21 gallon CP 2.5 HP model 61454. I recently replaced/repaired the reed valve and was working fairly well. Then a couple days later I noticed it kept running and would not go past 90 psi. Someone told me it might be the pressure sensor, but want another opinion form someone that may know from experience. Also if it is the pressure sensor or something else, where can I buy the right part?

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Author
Fix My Compressor Moderator
August 5, 2020 9:35 am
Reply to  Aurelio Salazar

Sure Aurelio, this issue is covered in detail on the pages of this site. Check the troubleshooting page, and read the pages that relate. If you still have questions, please add them as a comment.

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Michael W Moore
August 1, 2020 10:26 pm

I have a friend who has a Central Pneumatic Model# 95386 air compressor.
It is having and intermittant problem of the reset switch operating and having to be reset to get it started. When it starts again, it runs very slowly until it eventually trips again.
Sometimes it will run normally and stay running at the normal higher rate of speed and then eventually return to the slow speed until it is stopped by whatever it is that is tripping the reset. Any ideas as to which direction to look to solve this problem?

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Jeff
September 13, 2020 10:04 pm
Reply to  Michael W Moore

Sounds like it is plugged into an extension cord that is not heavy enough.

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Author
Fix My Compressor Moderator
August 2, 2020 10:54 am
Reply to  Michael W Moore

Assuming there’s no change in location, and the compressor worked there before, see the information on this site about checking the capacitors. The symptoms suggest the compressor start capacitor may be failing.

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Mark
July 15, 2020 10:15 pm

Where can I get a regulator assy for a Central Pneumatic 95275 compressor?

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Author
Fix My Compressor Moderator
July 15, 2020 10:51 pm
Reply to  Mark

Manifold for Central Pneumatic air compressor
I think when you pull the cover off you’ll see something like what is shown in the image uploaded. That’s a manifold, and I don’t believe parts for it are available, or if you can even find the manifold.

The solution is to assemble your own from standard brass fittings from a decent plumbing supply house, and replace the regulator that came with the unit with a general purpose mini-regulator (typically 1/8″ in port size, at a cost of about $15 for the new regulator. Then, if you have regulator problems again, it’s easy to get a replacement. Good luck.

The image was a “screen grab” from a you tube video by Don Brandt about repairing a Central Pneumatic compressor. The video can be viewed by following this link.

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wilmead
July 11, 2020 8:52 am

I have a problem with a central pneumatic (Harbor Freight) 29 gal oil lubed unit that will build pressure fine until it reaches ~100 psi then it starts to “strain”/”lugs” and motor ( single phase induction 120v) begins making some “ticking/clicking” noises and unless I turn it off manually it will trip the breaker in the panel ( never the motor reset).

I’ve replaced the run cap-(did not fix). Tank check valve seems ok ( no visible signs to indicate faulty and no air leaks from anywhere when tank pressurized).

Unit is supposed to cut out at 150 and back in at 120.

I purchased the unit in this condition (used- barely-it looks brand new so obviously hasn’t seen much use and seller didn’t have much history about it). What else could it be? Thanks in advance.

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wilmead
July 13, 2020 12:04 pm
Reply to  wilmead

20 amp breaker. Panel to outlet is ~ 25′.

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Author
Fix My Compressor Moderator
July 14, 2020 10:45 am
Reply to  wilmead

Thanks for the info. I expect your compressor is 1.5-3 HP in motor size, and as such, the power supply should be more than adequate.

If it’s not the power supply to the motor, it must either be an increasing load due to air pressure building, a mechanical issue backloading the motor, or the motor itself. That it’s popping the breaker at the panel and not the motor cut out says to me that it’s not a heat issue (the motor would trip out on thermal) but is load related.

It were mine, it would be time to pull the top off the pump and check the valves.

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Author
Fix My Compressor Moderator
July 11, 2020 3:49 pm
Reply to  wilmead

My first thought is power supply. What’s the breaker amperage, and what’s the distance between the panel and the socket?

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Robert Ray
June 24, 2020 7:48 am

Had my 125psi 2.5 hp 21 gallon central pneumatic lil over a year NEVER BEEN HAPPY DOESNT NEAR ENOUGH AIR. Also the cold start valve went out as they ALL DO !

Went to replace it and never got valve screwed all the way in until the housing on the compressor snapped into. BEFORE YOU SAY I OVER TIGHTENED, I’M A CERTIFIED PRECISION STEAM TURBINE MECHANIC I KNOW ALL ABOUT TORQUE SPECS AND EXCETRA.

TERRIBLE PRODUCT WILL ( NEVER BUY ANOTHER ONE ! JUST SCRAP NOW!!

RATE 1 ☆ ROBERT RAY MOUNT PLEASANT,TX.

15929992363051501505624409066927.jpg
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Sam
June 23, 2020 6:45 pm

I purchased a Central Pneumatic 67696 Air Compressor several years ago. A few weeks ago it would not shut off at the high pressure level approximately 150PSI. The PVR goes off and the motor does not shut down. I ordered a new switch thru Amazon. It arrived yesterday after a week delay and got it installed. Nothing has changed. Any suggestions.

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Author
Fix My Compressor Moderator
June 24, 2020 8:26 am
Reply to  Sam

Is the PRV is letting go too soon? What pressure is the PRV letting go at? Note that the air gauges can be out of range by +-5 PSI.

It’s that or you have a bum switch. There seems to have been a lot of complaints of that going around recently. Possible a bad batch by the Chinese plant.

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SAM
July 4, 2020 9:31 am
Reply to  Fix My Compressor Moderator

Thanks for the info. Will try to locate a new PRV. If that doesn’t work I’ll try better gauges. If they cost too much, I’ll just fill the tank and shut it down.

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Stephen Sweet
June 18, 2020 9:08 pm

I bought a central phumatic twin cylinder 145 psi pump 1 year ago with a new 5 HP electric motor 3450 rpm. I did the math from the HF manual and installed 4.5″ pulley on electric motor. I just started to build the air compressor a week ago June 10,2020 the parts have been in my garage shrink wraped until I needed them . After several configurations of the 3/4″ tubing that i replaced from flared copper to compression stainless steel and installing new tank check valve 3/4″ with a a 90-145 psi pressure switch all I can get out of my compressor is 25 psi. I have a HD 60 gallon tank. The pump gets close to 25 psi and slows to trip the electric motor if I dont throw the on off switch. I have changed the start capacitor and run assist capacitor with no change. Checked the reed valves were all good and put new gaskets on the valve plate and head.i changed out 2 different pressure switches and 2 capacitors. I am out out ideas and watched videos asked people at HP and everone tells me to change the parts I have changed please can some one help me .

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Steve from Austin
December 27, 2020 8:52 pm
Reply to  Stephen Sweet

Try filling the tank from another compressor. (Make an F-to-F adapter). This will test your tank and fitting integrity and the gauge readings. Use soapy water or windex spray to check for slow leaks.

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Author
Fix My Compressor Moderator
June 18, 2020 10:11 pm
Reply to  Stephen Sweet

It sounds like a power supply issue, that or loading on the pump from increasing air pressure is overcoming the motor’s ability to drive against it. Help others help you and tell us a bit about the power supply to the compressor from the breaker at the panel to the compressor, won’t you?

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Bill Busch
June 17, 2020 11:25 am

I have a 3 gal oiless pancake compressor. Central pneumatic. I am looking for the regulator for this compressor model 60637. Any help.

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Author
Fix My Compressor Moderator
June 17, 2020 2:24 pm
Reply to  Bill Busch

Please, in a comment, add a photo of your compressor and the current regulator. Thanks.

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Bill Busch
June 23, 2020 4:28 pm
Reply to  Fix My Compressor Moderator

(I need ) the red pressure knob and valve assembly on the regulator manifold from the tank.

CB21C22E-80A9-4C13-94E5-C0D43E31B7FF.jpeg
Reply to original poster or commenter
Author
Fix My Compressor Moderator
June 23, 2020 5:05 pm
Reply to  Bill Busch

Hi Bill. Got this one photo, anyway.

If it were me, and knowing that parts for this regulator are few and far between, I’d simple replace the whole assembly with brass fittings from a decent plumbing shop, and then install instead of the junk that came with the compressor, and off-the-shelf 1/8″ regulator available almost anywhere for peanuts.

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Charles Kirk
June 17, 2020 5:58 am

I have model E 99780. It runs and builds pressure but does not hold pressure. New hose and fittings. Still does not hold for very long. And it is taking along time to build pressure.

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Author
Fix My Compressor Moderator
June 17, 2020 7:09 am
Reply to  Charles Kirk

It’s hard to tell from the drawings (no pictures) I’ve seen, but I believe the mini-pump on this compressor pumps into the tank via a valve. This valve is item 20 on the parts list. This valve should both allow the air from the pump to enter the tank while the compressor is running, and also keep the air in the tank while the compressor is off. That compressed air is then accessible to the filter / regulator manifold at the front of the compressor via the tube from the tank there.

If my surmise is correct, in that valve is a flapper or check, and if that flapper or check is not seating tightly, air will escape. You need to find that valve and check it I believe.

If you have no manual they are available on line.

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Roy
May 21, 2020 11:29 am

I have the 21 gal model 61454. Less than 2 months old. The reset keeps popping when its time to fill ? Start of day. Motor not hot. Tries to start then pops? Any ideas?

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Author
Fix My Compressor Moderator
May 21, 2020 4:11 pm
Reply to  Roy

A bunch… try these first.

– https://fix-my-compressor.com/compressor-trips-the-breaker-on-restart/

– https://fix-my-compressor.com/is-the-compressor-start-capacitor-working/

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Wayne
June 21, 2020 11:43 am
Reply to  Fix My Compressor Moderator

we have ran these tests.The air compressor turns on and fills to 5 psi and then shuts off. We have to push the reset to get it to run a little more. We have drained the tank unplugged watched for the arching and sparking (which there is none) It plugged straight into the wall.

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Author
Fix My Compressor Moderator
June 21, 2020 12:49 pm
Reply to  Wayne

I would think from the symptoms described, the start capacitor is weak or failing. Please go here: https://fix-my-compressor.com/air-compressor-problems-and-fixes/ and scroll down and look at the pages to do with capacitors if you aren’t sure about what they are.

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Emmett Coomes
May 17, 2020 5:06 pm

Where is the shaft cap and centrifugal switch on this if there is either? Also where would I get the same motor or one that works better yet is compatible to this compressor
Model: 61454
21 gallon
125 psi

7278729C-2D5E-4481-9CEC-F8E0100319BF.jpeg
FBEADDAE-ED7B-4813-B9FA-BF6213BE379B.jpeg
F00C8A51-09E5-42F7-8BF7-B524A3D811D7.jpeg
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Author
Fix My Compressor Moderator
May 18, 2020 10:14 am
Reply to  Emmett Coomes

Typically the centrifugal switch for an electric compressor motor is on the shaft end that connects to the drive. It’s normally under the cap, and looks like this.

electric Photo: Amazon.com

If you aren’t seeing this, then your compressor motor doesn’t have one. Time for a motor load check at a repair depot.

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Christopher Harvell
May 14, 2020 5:07 pm

Hey there. I got the 69091 model 21 gal 125 psi air compressor. I let it sit outside forgetting it was there and didn’t change the oil. I ran it for about a year here and there doing small stuff but this week I turned it on and heard a snap and the motor went to running super smoothe. The connecting rod broke.

I need to know if there is a replacement part for it and if so a part number. I can’t find one. I’ve emailed hf and no answer yet. I’d like to fix it if it’s available. Its been a great small compressor. Thanks for your input

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Author
Fix My Compressor Moderator
May 14, 2020 6:10 pm
Reply to  Christopher Harvell

Parts for this model of compressor available from HF are here. Otherwise, you may be out of luck and may need to get the connecting rod made for you.

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norbert kozlowski
May 14, 2020 12:52 pm

I bought a compressor used and doesn’t have a manual. How do i find a model number. Can you help

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Author
Fix My Compressor Moderator
May 14, 2020 2:59 pm
Reply to  norbert kozlowski

What is the HP of the compressor you have, plus, if you can find out, the tank size?

Go the the Harbor Freight site and see if that one is there.

Or, Google Central Pneumatic compressors (adding the motor HP and tank size) and see if you get an image back of yours. That may help identify the model.

Adding a couple of photos of your compressor in a comment on this thread wouldn’t hurt.

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norbert kozlowski
May 14, 2020 3:40 pm
Reply to  Fix My Compressor Moderator

Here are some pics. Psi 175 max

15894849136911560141924024193861.jpg
1589484982455972576160565530917.jpg
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Fix My Compressor Moderator
May 14, 2020 3:56 pm
Reply to  norbert kozlowski

Thanks for the pics.

It would appear as though yours is an older version of the currently available C201H. If you go to the HF website and look for this one, you can download from that page the three manuals of the various iterations of this compressor. Please check and see if the info you get from them is what you are looking for.

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Robert Kelley
May 9, 2020 12:25 am

CP model#61454
Looking for part #15884
Reed valve rebuild kit

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Author
Fix My Compressor Moderator
May 9, 2020 8:51 am
Reply to  Robert Kelley

You have checked with HF to see if they’ve got it? The 2019 manual for this compressor shows that it was available from them then. REPLACEMENT PARTS IN STOCK
Call to Order: 1-800-444-3353

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Emmett Coomes
May 8, 2020 10:42 pm

Will this capacitor work as replacement for stock one? The second picture where am I holding it with my hand is the stock one
Compressor model 61454 2.5 hp 21 gallon

Specs on possible replacement: 140 microfarads 250 VAC

A0658CDC-F996-4F19-B99C-194B563BFE6D.png
6747F490-05D4-4B3D-90F1-CC9B20EF40CE.jpeg
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Author
Fix My Compressor Moderator
May 9, 2020 8:46 am
Reply to  Emmett Coomes

As the page says I believe, if the micro farad specs are comparable, if the voltage range is comparable, and you can actually fit the new cap in the location where the old one was, then you’r good to go. It appears as though the new cap meets those criteria.

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Emmett Coomes
May 16, 2020 7:24 pm
Reply to  Fix My Compressor Moderator

My compressor still won’t run and there was no improvement from the new capacitor. I replaced the capacitor on my central pneumatic compressor and I believe the old one was good still , could it be the motor or some other part I can replace, I don’t believe it’s The on/auto switch, I replaced that already and the one I had on before worked fine before The compressor just buzzes and no rotation of the compressor. Even when I try to get it going by pushing the fan and removing the cold start valve, it still will not continue or start running.
Model: 61454
Power: 2.5
21 gallon tank
125 psi

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Author
Fix My Compressor Moderator
May 16, 2020 7:26 pm
Reply to  Emmett Coomes

Darn, Emmett. Yup, if the start cap doesn’t resolve the issue, and the motor is trying to start and it’s not doing so, then it’s a motor issue. If you know about electrical motors,pull the shaft cap off and see if there is a centrifugal switch. If that’s locked up that may be the issue. Failing that, it’s time for an electric motor shop I would think.

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Emmett Coomes
May 7, 2020 5:00 pm

Hi, my harbor freight air compressor is not turning over, the motor refuses to spin, it buzzes and then the fuse will get tripped, not sure what the problem is. Hasn’t been used much at all.
Model 61454 21 gallon 2.5 hp pressure switch 125 psi

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Emmett Coomes
May 8, 2020 2:11 pm
Reply to  Emmett Coomes

Where do I get the exact start capacitor for my model air compressor
Model 61454, 21 gallon, 125 psi, 2.5 hp

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Author
Fix My Compressor Moderator
May 8, 2020 5:35 pm
Reply to  Emmett Coomes

https://fix-my-compressor.com/finding-a-new-compressor-capacitor/

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Fix My Compressor Moderator
May 7, 2020 6:32 pm
Reply to  Emmett Coomes

If it was working where it is before, and the power supply hasn’t changed, then I think the link following has information about what the problem is on your compressor.

https://fix-my-compressor.com/is-the-compressor-start-capacitor-working/

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Tim Savunen
May 4, 2020 1:59 am

Looking for new pistin ring, head o-ring gasket set needed for model: 67847
2.5 hp, 21 Gallon, 125 psi, upright oiled compressor.
Any help on part numbers or where to find parts. Thank You!

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Author
Fix My Compressor Moderator
May 4, 2020 10:11 am
Reply to  Tim Savunen

I can find no sources for parts for a central pneumatic 67847. I hope someone else can help, though I expect their will be few available. All you may be able to do is measure the various components and try to find them from the manufacturers such as O rings, piston rings etc. The compressor companies rarely make these items themselves.

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Pater PArker
April 29, 2020 10:53 pm

Hi I have a HF 62551 (many model number are the same) compressor 6 gal, 1.5hp . I need regulator parts or a regulator. Is it available or can you recommend a generic I can get a few parts out of. Parts and orings just under the knob. Thanks

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Author
Fix My Compressor Moderator
April 30, 2020 9:47 am
Reply to  Pater PArker

Cannot find a photo of the unit. Please add a comment with a photo of the compressor, and a closeup of the installation where the regulator attaches. Thanks.

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Steven P Stogner
April 27, 2020 7:14 am

I have a 3 gallon pancake compressor and pulled a Griswold. I stepped on the manifold coking to the tool side of the regulator and the manifold is broken in two places. Any suggestions for where I can purchase a new manifold that would fit? Compressor, gauges and regulator all work great. Thanks

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Author
Fix My Compressor Moderator
April 27, 2020 9:19 am
Reply to  Steven P Stogner

Steven, I don’t know what you mean by “manifold coking”. I suspect you meant cover? Regardless, there are no after-market parts for the 3 gallon pancake compressor that I’ve found, however, the ones I did find all are more than $30 plus shipping. Since a new 3 gallon Central Pneumatic is $60, if this size provides enough air, if it were me I’d buy a new one and keep the old one for parts which, I expect, will be needed sooner than later. Good luck.

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Steven P Stogner
April 27, 2020 9:57 am
Reply to  Fix My Compressor Moderator

Sorry – that was a typo. I meant to say “stepped on the manifold on the tool side…”. I’m going to be taking the manifold to a couple of shops and see if they have any suggestions as I have found nothing online. I will post an update if I have anything worth sharing.

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Howard E Snow jr
April 24, 2020 4:46 pm

Just bought a 21 gallon compressor and was wondering if there was supposed to be metal stuff in oil breather

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Author
Fix My Compressor Moderator
April 24, 2020 5:59 pm
Reply to  Howard E Snow jr

Oil breather? Are you talking about the air intake to the pump? Please clarify. Also, what model is it? Thanks.

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Robert Kelley
April 19, 2020 8:49 pm

I have a CP 21 gal 125psi vertical A/C! It will not build pressure above 25psi & the Start valve is continuously leaking! Is there a way I can repair it or must I purchase a new start valve! I live in South Louisiana!

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Author
Fix My Compressor Moderator
April 20, 2020 10:07 am
Reply to  Robert Kelley

By the start valve, are you perhaps referring to what I would call the pressure switch? If so, when the compressor is running no air should be exiting the unloader valve that is part of this pressure switch. I can’t see if the unloader is on the side of the pressure switch or underneath and integral to the switch. From what you’ve written it seems that the unloader valve is not shutting off when the compressor starts to pump air, as it is supposed to. You may have a problem with the unloader then. See the pages about various compressor parts on this site if you aren’t sure of what I write.

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Evan Vulich
April 19, 2020 7:57 pm

CENTRAL PNEUMATIC 6 Gallon 1.5 HP 150 PSI “Pancake” Air Compressor regulator (red knob on top) is broke. I need replacement.
Where in the world can you find one? Searched the web. Going to visit my HF in the morning. Thanks!

April 19, 2020

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Dixon Smith Jr
July 16, 2020 5:30 pm
Reply to  Evan Vulich

I have leak from the regulator knob – I’m thinking I need a new one or maybe there’s an o-ring in there? Did you find parts?

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Author
Fix My Compressor Moderator
April 20, 2020 10:02 am
Reply to  Evan Vulich

I expect you’ll find that HF will not be able to help, not really having much of a supply chain for the many different models of air compressors they sell. I also expect that the regulator is part of a manifold, and that you’ll not be able to get parts… I may be wrong.

Here’s a link to the page about your compressor. On it you’ll find links to the manuals of the two model numbers that fall under these specs. Have a look at the manual for your compressor and scroll down to the parts drawing and list to see what I mean.

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Marshall
April 18, 2020 7:07 pm

I have the 8 gallon Central Pneumatic model 40400, I have an issue where the shut off switch won’t stay up by itself in order to shut it off while running. I have to keep it held up while I pull the plug. It will stay up when the compressor is not running. I’m guessing I need to just replace the switch, Anything else I should check before doing that?

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Author
Fix My Compressor Moderator
April 18, 2020 9:53 pm
Reply to  Marshall

Are you saying that the manual shut off isn’t working? The ON/OFF switch should be on all the time the compressor is running, and the pressure switch is what shuts it off and cuts it back on when the pressure drops. If the ON/OFF part of the switch won’t shut off, yup, it’s time for a new switch. As to anything else, are there any other symptoms on the compressor that you feel aren’t right?

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Marshall
April 20, 2020 1:26 pm
Reply to  Fix My Compressor Moderator

Yes, the manual shut-off. As far as I can tell, it is the only power switch. Thanks for your help. I’l replace the switch. .

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Jerry Benison
April 15, 2020 9:14 pm

CP 2.5hp 21gal, After good service for 3 years, the 1/4″ cold start valve failed to close after running the normal time. I ordered another cold start valve and installed it and it also bypasses continuously without closing. Am I missing something obvious?

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Author
Fix My Compressor Moderator
April 16, 2020 9:44 am
Reply to  Jerry Benison

Was the compressor still able to pump up to cut off pressure even though air was leaking?

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Jerry Benison
April 16, 2020 9:14 pm
Reply to  Fix My Compressor Moderator

Willy, it never got above 40psi. Is my problem related to volume issue. Maybe a reed valve leaking back to intake? I thought about installing a 1/4″ valve in place of the start valve and close it after the compressor got it’s stroke rate going and see what the pressure built up to. If it don’t’ build pressure I’ll pull the head and check the reeds. Any different ideas Willy? I’m retired oilfield but, surprisingly, I didn’t reach for the four pound hammer first

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Author
Fix My Compressor Moderator
April 16, 2020 10:40 pm
Reply to  Jerry Benison

I think, rather than a cold start valve, that you have a pump valve failing and it’s not able to generate enough to close the cold start, providing that the replacement cold start has the same closing pressure as the original.

If you haven’t tossed out the old cold start, a good rinsing in solvent might help, but that won’t stop the issue if it’s not the cold start and a pump valve or gasket issue.

Also, if you have a plug for the cold start port, plug it. Empty the tank, that will emulate the venting over the piston, and start the compressor. If it doesn’t build to cut out pressure, it’s not the start valve.

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John
March 27, 2020 8:45 pm

I have a used Central Pneumatic “67708” air compressor and last summer the Oil Breather Plug just shot out. I contacted Harbor Freight and they don’t sell them. So my questions is will these fit my air compressor?

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Author
Fix My Compressor Moderator
March 28, 2020 12:30 pm
Reply to  John

John, I don’t have the compressor in front of me to measure the threads on the oil dipstick tube. 16 mm is just under 3/8″. Is that what the hole size is in the oil fill tube?

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John
March 31, 2020 2:16 pm
Reply to  Fix My Compressor Moderator

Hi, Not sure where my first post went.
I measured the opening yesterday and it measured 5/8 of an inch. I also used a 5/8 tap just to check the threads, and it wasn’t tight but it threaded in. I’m attaching a picture of measuring.

IMG_2586.jpg
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Author
Fix My Compressor Moderator
March 31, 2020 4:56 pm
Reply to  John

Thanks for the photo, John. So, you know the port is approximately 5/8″, but it’s loose. That suggests that the thread is metric to me. What’s the size of the thread on the plugs you found?

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John
March 31, 2020 5:13 pm
Reply to  Fix My Compressor Moderator

Male Thread Diameter: 16mm/0.6″; Total Size: 56 x 28mm/2.2″ x 1.1″(L*Max.D)

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Author
Fix My Compressor Moderator
March 31, 2020 6:09 pm
Reply to  John

5/8 is .625 so it might work.

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John
April 6, 2020 9:31 am
Reply to  Fix My Compressor Moderator

Thank you. Ill let you know if they work.

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Allen Wight
March 25, 2020 6:36 pm

I have a 21 gal Central Pneumatic compressor… Works great — fills up to 105psi and as soon as it hits that number, it shuts off and starts bleeding air from the pressure valve. When down to 50psi or so it starts up again. Back up to 105psi, shuts off and bleeds very rapidly down to 50psi and starts running again. I just replaced the pressure valve with a like one — seems to be doing the same thing. Ideas?

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Author
Fix My Compressor Moderator
March 25, 2020 7:16 pm
Reply to  Allen Wight

Allen, it sounds very much like your tank check valve, the valve that is supposed to keep the air in the tank and ready for use, is leaking, allowing tank air to flow up and out the unloader. Dump all the air with the power cord out, remove the fitting where the line from the pump enters the tank, and clean and test the tank check valve.

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Allen Wight
March 26, 2020 11:25 am
Reply to  Fix My Compressor Moderator

Thanks — I’ll give it a try…

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Charles Jensen
March 21, 2020 3:34 pm

Item #67696 Won’t hold air pressure at all wont stop running.

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Author
Fix My Compressor Moderator
March 21, 2020 4:01 pm
Reply to  Charles Jensen

Sure Charles. A good place to start? Right here: http://fix-my-compressor.com/air-compressor-will-not-stop/

As well, other issues that maybe in play can be found here: http://fix-my-compressor.com/air-compressor-problems-and-fixes/

Please have a look, and then, add a comment to this thread if you still need some help.

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KenJ
March 15, 2020 4:47 pm

I have the Central Pneumatic #62511 6 gallon oilless air compressor that pumps up to nearly 150 psi but does not stop. I attempted to remove the top, but none of the sockets I have will remove the m6x25 screws (I have tried all metric and sae sizes that will fit down the hole. It looks to me like the screws have a round head rather than a hex head which makes no sense, except if this is a way to keep owners from servicing their unit. The compressor is about a year old, and has about 5 hours of use on it. Any information on this will be welcome.

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CARROLL G ALLEN
March 14, 2020 12:12 pm

My Harbor Freight air compressor has only about five hours on it, and it will not pump more than 50 PSI. Used to work fine.

Model 62803, 21 gallon, 2.5 HP motor. Can you advise?

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Author
Fix My Compressor Moderator
March 14, 2020 12:22 pm
Reply to  CARROLL G ALLEN

Sure. The answer depends on what happens when the compressor gets to the 50 PSI. Does it stop? Does it keep running? Please advise, and please also look at this page for more information.

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carroll allen
March 14, 2020 12:55 pm
Reply to  Fix My Compressor Moderator

keeps running.

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Author
Fix My Compressor Moderator
March 14, 2020 1:56 pm
Reply to  carroll allen

Okay, if the pressure stays at 50 PSIish, and doesn’t rise, and the compressor keeps running, it’s typically a leak (tank drain, unloader valve, open line) or the pump has an issue with air sealing. A gasket or seal in the pump head, or a valve that isn’t working right. Solutions are found on either the troubleshooting or brand-specific pages on this site.

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Andrew Poole
March 2, 2020 9:42 pm

My 6 gal 1.5 GO will not start its approx 8 months old barely used shot approx 400 3 in nails that’s it.

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Keith
February 25, 2020 7:24 pm

I have a central pneumatic 8 gallon air compressor, model 94355 and need a pressure regulator. Can’t find one anywhere. The adjusting knob is stripped.

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Author
Fix My Compressor Moderator
February 27, 2020 6:08 pm
Reply to  Keith

Keith, I am unable to find a reliable image of this 94355. Please add a comment with a photo of the whole compressor, and a photo of the regulator you are trying to replace. If the regulator is in a manifold, please remove the cover before taking the photo.

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Keith
February 28, 2020 11:41 am
Reply to  Fix My Compressor Moderator

Here are photos with the regulator in and out. Thanks

298F066E-5C39-4F26-A318-0F3FA2B4E404.jpeg
D819B373-0F8A-40F0-8826-AA0FE892803B.jpeg
23824ED3-B7D7-4F24-98D1-E871E7220432.jpeg
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Author
Fix My Compressor Moderator
February 28, 2020 12:12 pm
Reply to  Keith

Yeah, I was afraid of that. There are no after market sources for the regulator manifold. Your only choice I can see is to build one using off the shelf brass fittings, one that works the same but doesn’t have to look the same, and that may mean cutting out a piece of the cover to allow your jury rigged manifold to fit.

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Dillon
February 16, 2020 3:31 pm

I got a central pneumatic 125 psi 21 gal 2.5hp air compressor keeps running not building air what could be the problem

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Author
Fix My Compressor Moderator
February 16, 2020 5:59 pm
Reply to  Dillon

Could be a bunch of things, Dillon. Hard to be specific in this response when the troubleshooting page on this site has a link to a page that is all about just this issue. Maybe have a look at that, and then add a comment here if you still require help. Thanks.

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Alfredo Zuniga
February 14, 2020 7:36 am

My central pneumatic compressor 2.5hp. 21 gallon squires oil through the fill cap?? What can it be??

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Author
Fix My Compressor Moderator
February 14, 2020 11:05 am
Reply to  Alfredo Zuniga

Follow the link to the general troubleshooting page, and then scroll down to the page that addresses this issue. If you still need help after, please add a comment.

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Glynn Wright
February 11, 2020 12:20 pm

I have a 30 gal 150 psi vertical compressor that won’t pump up more than 50 lbs. No leaks. Where can i buy parts to rebuild the motor? Compression rings and oil rings and gaskets.

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Author
Fix My Compressor Moderator
February 11, 2020 9:12 pm
Reply to  Glynn Wright

Not a lot of Harbor Freight air compressors have parts supply, Glynn.

You can search using the model number. Without that it will be hard.

You can make valve plates and gaskets yourself, and pages about that can be found on this site. As to the motor, any electric motor repair shop should be able to help. Unfortunately, getting professionals involved with rebuilding lower cost compressor components can quickly add up to more money that buying a new compressor off the bat.

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Glynn Wright
February 12, 2020 4:36 pm
Reply to  Fix My Compressor Moderator

I could not find a model number on this unit but did find a parts diagram blow up naming all the parts. I can rebuild it myself, i rebuild engines myself. Already bought a big 80 gal compressor but wanted to fix this one and give it go my son in law who doesn’t have one. The parts manual had a model number that closely match the piston housing on mine. It said that i could not buy parts but must buy the motor as a unit. In that case, it would be cheaper to just buy a new unit. I like my son in law, but not that much.

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Author
Fix My Compressor Moderator
February 12, 2020 5:33 pm
Reply to  Glynn Wright

:-}

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Shawn
February 9, 2020 1:18 am

Can the Central Pneumatic 3 gallon 1/3 HP 100 PSI Oil-Free Pancake compressor be modified to have an intake feed rather than pulling from the ambient air around the motor, without having to drill and tap the cylinder head for a check valve and somehow disabling the intake through the piston?

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Author
Fix My Compressor Moderator
February 9, 2020 9:01 am
Reply to  Shawn

If the intake of the piston is on the top of the piston cap, and it is not presently threaded, then no, I don’t see how.

If you can plumb the air to the intake port and the supply line is bigger than the intake port of the compressor, it should work. It would also depend on how long the supply line was and how many fittings in it, as that would reduce air flow.

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Bob Wilson
February 8, 2020 3:42 pm

I have a central pneumatic 3 gal 100 psi. It wont cut off after reaching pressure.

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Author
Fix My Compressor Moderator
February 8, 2020 6:37 pm
Reply to  Bob Wilson

Likely the pressure switch is the issue, Bob. Please see this page for links to how to check.

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Leslie
February 4, 2020 6:02 pm

Hi, I have a central Pneumatic 1/3 hp 3 gallon pancake compressor, it won’t work at all. My husband used it for some trim and now it’s completely dead. Tried the reset switch and got nothing. Is all hope lost? Thank you

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Author
Fix My Compressor Moderator
February 5, 2020 10:58 am
Reply to  Leslie

Sure. Please see: https://fix-my-compressor.com/air-compressor-will-not-start/ and do the checks. Add a comment to the thread if you still need help after.

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Buck Cowick
January 29, 2020 3:00 pm

I have a Central Pneumatic model # 61454
The problem I am having is it shuts off at about 40 lbs and it won’t come bass look on unless I hit the reset button. Anyone else had this problem?

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Author
Fix My Compressor Moderator
January 29, 2020 3:27 pm
Reply to  Buck Cowick

Lots of folks have the same sort of issue with their air compressors, Buck. Have a look at this page and scroll down to those that are part of the diagnosis and correction: https://fix-my-compressor.com/air-compressor-problems-and-fixes/

Please add a comment to your post if you still need compressor help.

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Damian Clarke
June 25, 2020 7:00 am
Reply to  Fix My Compressor Moderator

I was having this problem too, my motor was drawing too many amps and overheating. This was due to having a 5HP SPL motor which is actually only 3.5hp with a 15amp full load. I purchased a new motor that is 6.5hp continuous at 23amps and have no problems at all. Check your motors amp draw at full load right before the thermal overload switch trips.

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Gordon K Smith
January 26, 2020 3:48 pm

Brand new 1/3hp 3gal burns up fuse as soon as it is turned on. What amp fuse do I need?

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Author
Fix My Compressor Moderator
January 26, 2020 5:24 pm
Reply to  Gordon K Smith

If it is a Central Pneumatic 69269 compressor, it’s a 3 amp fuse.

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Oralia B Acuna
January 21, 2020 2:21 pm

father has a CentralPneumatic 2.5 HP, 21 gallon, 125 PSI cast iron vertical air compressor model 67847 that will not start. Can I get some ideas on what to troubleshoot that could be the problem for this compressor. My dad does have the original manual and I called the customer service number but they were not very helpful. Tried taking to a repair shop and were informed they do not work on Harbor Freight compressors

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Greg P
February 9, 2020 4:26 pm
Reply to  Oralia B Acuna

Check the capacitor on the motor, just replaced mine.

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Author
Fix My Compressor Moderator
January 21, 2020 7:42 pm
Reply to  Oralia B Acuna

Sure. See the links from this page: https://fix-my-compressor.com/air-compressor-problems-and-fixes/

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David White
January 19, 2020 3:26 pm

Hi,
I have a 3gal oiless 100psi pancake compressor Model # 61615. it was filling today and then suddenly I heard a big change in the noise it was making to fill. I then noticed it would not fill at all. I took apart and discovered the aluminum line that goes from motor/pressure head is broken. Any chance in finding a new one?

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Author
Fix My Compressor Moderator
January 19, 2020 5:00 pm
Reply to  David White

Hi David. I got a chuckle out of seeing the Q.C. (quality control) label beside the broken part. Take the fitting off both ends and go to a decent plumbing shop. They should be able to make one for you out of soft copper tube, which will work just fine. Or, get the fittings and tube and make your own using soft copper.

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John
January 14, 2020 10:37 pm

I have the average 10gal 2.5 hp air compressor on wheels pushes like 4cfm. I would like info on how or if possible to install proper compressor to get like 7.5+cfm I see motors and compressor for under 200 total but no info on if it will fit my style

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Author
Fix My Compressor Moderator
January 15, 2020 11:21 am
Reply to  John

John if you are looking for a compressor that delivers 7.5 CFM at 90 PSI, then you’ll want to get a compressor that’s a “real” 3 HP or so. Otherwise, you’ll stand the risk of buying a compressor that promises higher flow, but cannot deliver. On average, a smaller air compressor will deliver about 3-4 CFM of air at 90 PSI per each “real”, that’s run HP, not start HP, of compressor.

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Mike
January 13, 2020 5:58 pm

I purchased the 1.5 HP, 6 GAL. 150 Max. PSI. compressor. I used this about 4 times. The 5th time, I noticed that the compressor ran for a longer time than normal.

I went to inspect, found that the pressure gauges both showed less than 10 psi. I could feel the air being by-passed out the relief valve.

So I took off the top and checked the fasteners for the head. WOW, found two of them stripped. CHEAP FASTENERS FOR A $100.00 plus compressor.

Will never buy another central pneumatic item!!! I will go to Home Depot and get some higher grade fasteners. Thanks Central Pneumatic.

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Bob J
January 7, 2020 10:36 am

My start valve on my 125 psi harbor freight compressor wasn’t popping out. I replaced it. Still didn’t work. After checking things I found on the internet about it, plus taking the head off and checking reed valves, it still wouldn’t work.. I removed the air filter and the start valve popped out and started filling with air.
I replaced the whole filter unit.. Works great!

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Jay
January 1, 2020 9:57 pm

I have model #69667 I need replacement part 49 drain valve broken ?

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Author
Fix My Compressor Moderator
January 2, 2020 9:11 pm
Reply to  Jay

If you are speaking of the tank drain valve, if you browse for “replacement tank drain valve” you will find many. It doesn’t have to be one from the compressor manufacturer.

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Scott Moss
December 27, 2019 1:21 pm

Anybody know where I can get the three-eared Inlet valve reed for a Central Pneumatic 26 gal air compressor?? (item #69669, part #6 in the PDF owner’s manual) Thank you in advance

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Bobby Taylor
December 23, 2019 1:02 pm

I have a older central neumatic air compressor model 61693 21 gal 2.5 hp I need a connecting rod where can I get one

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Author
Fix My Compressor Moderator
December 23, 2019 2:05 pm
Reply to  Bobby Taylor

I know of no after-market sources. You could try HF customer service at: 1 (800) 444-3353 during business hours. Otherwise, I hope someone else knows a source.

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Jason S
December 22, 2019 7:54 pm

I have a central pneumatic model 61454. It is a couple of years old. About 2 weeks ago, I noticed that it would not pressurize past 75 psi.. It then dropped to max of 50 psi a week later, and now it won’t go past 25 psi. Any suggestions?

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Harold A Hager
January 6, 2020 5:55 am
Reply to  Jason S

(It’s the) head gasket. You can make one, takes a little time to do.

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Jason
January 7, 2020 9:07 am
Reply to  Harold A Hager

Ended up being a broken Reed valve. Got a pair of Amazon for $12.50. Pressurized to 125, no prob. Bonus: did not need to break a gasket, it was located on the same level as the metal gasket.

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Author
Fix My Compressor Moderator
December 23, 2019 6:52 am
Reply to  Jason S

Sure Jason. There are a few things to check. Info about what they are is located here, under Pressure & Flow problems:

https://fix-my-compressor.com/air-compressor-problems-and-fixes/

Please have a look, and add a comment with what you found.

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Brittany fuller
December 21, 2019 8:36 am

I have a central pneumatic compressor model 69667. Do these compressors have a serial number on them or is it just the model number?

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Author
Fix My Compressor Moderator
December 21, 2019 8:53 am
Reply to  Brittany fuller

Hello Brittany. You’ve scrutinized all over the compressor, and under the cover? Given that these are manufactured in Asia, and there possibly isn’t a need for an individual serial number for each unit, odds are good there isn’t one. However, the proof can be found by calling: Harbor Freight at 1-800-444-3353 during normal business hours.

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Mark Velasquez
December 18, 2019 11:42 pm

I have 21 gallon compressor. Does not build up pressure into tank. Pressure directly out of crankcase. What do you think problem can be???

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Andrew M.
December 31, 2019 7:21 pm
Reply to  Mark Velasquez

It sounds just like what I had happen with my 2.5hp 21 gallon compressor. Check the Reed valves.

I found my parts on ebay
Central Pneumatic Air Compressor Reed Valve Valves STAINLESS STEEL 61693 61454

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Author
Fix My Compressor Moderator
December 19, 2019 6:54 pm
Reply to  Mark Velasquez

It would be helpful if you could explain this… “Pressure directly out of crankcase. ” more fully, Mark. And also in your comment on this thread, whats the model number of the compressor please?

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David Plew
December 18, 2019 3:57 pm

My father purchased brand new from Harbor Freight item 69269 a 3 gallon 1/3 HP Central Pneumatic oiless air compressor in August 2017. He has used it maybe a half dozen times in 2 years. 2 weeks ago it was used to put air in golf cart tires and it worked fine. 3 days ago turned it on and it will not build air pressure. Neither air gauge (tank or outlet) is registering any pressure. If I pull the relief valve there is air pressure. Also air is released when the drain valve is opened. There is no pressure using the air hose and attachment.

Is this fixable?

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Author
Fix My Compressor Moderator
December 18, 2019 4:41 pm
Reply to  David Plew

Sure, anything’s fixable, even if parts have to be fabricated. The symptoms you describe suggest that there’s an issue with the pump, perhaps a valve, or, you’ve a major leak that drains the air as the compressor is pumping… like a tank drain open or some such.

Unless you get giggles out of working on stuff and fixing things, given that this compressor is currently selling new for $60, make a choice. Junk it, keep if for parts, and buy a new one that will, surely, wear out and need repair.

At $60 retail this compressor probably cost $10 at the Asian source or thereabouts, and as such won’t have much in the way of long lasting, quality parts.

Good luck.

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Larry Helsel
December 11, 2019 9:47 am

My 2.5 gallon, unused but 2 years old, builds pressure to 100 psi but will only give a short weak burst of air through my air gun. Tried other tools with same weak response.

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Larry Helsel
December 12, 2019 5:23 am
Reply to  Larry Helsel

Well, I snooped around this site a bit after posting and found exactly what my problem is. The connecters on my air hose and the compressor are not compatible. I borrowed an outlet connecter from my large compressor and just like that the problem is solved.

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Author
Fix My Compressor Moderator
December 12, 2019 7:29 pm
Reply to  Larry Helsel

OK, not the regulator! 🙂 Glad you found the problem.

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Author
Fix My Compressor Moderator
December 11, 2019 5:47 pm
Reply to  Larry Helsel

When the air tool gets that “weak burst of air”, is the tank gauge pressure level showing a significant drop… by 20-30 PSI or more? If not, then I would suspect that you’ve got a failed regulator, Larry.

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Brian A.
December 9, 2019 9:28 am

I have a central Pneumatic oil less airbrush compressor model 60329.
I am in need of a pressure switch and I called for a replacement and was told they do not make replacement parts for this compressor. Does anyone know of a compatible pressure switch for this model?

Thank you

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Author
Fix My Compressor Moderator
December 9, 2019 5:11 pm
Reply to  Brian A.

You have pulled the existing pressure switch, Brian? If you browse for small compressor pressure switches, do you find any? Can you add a photo of the compressor and pressure switch in a comment on this thread, please?

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Brian A.
December 11, 2019 8:27 am
Reply to  Fix My Compressor Moderator

Yes, i did pull the existing switch. i just purchased a low pressure switch (15 to 35 psi). I will try this when it comes in and post the results.

Thank you.

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Richard
December 4, 2019 5:34 pm

Thank you since I already have the gauges and I just would put together a manifold would I just need the regulator without the gauge.

Regulator base on part of compressor manifold

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Author
Fix My Compressor Moderator
December 5, 2019 9:08 am
Reply to  Richard

When you buy a regulator it almost always comes with a gauge. Since they are low cost and prone to failure too, keep it as a spare.

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Richard
December 4, 2019 4:37 pm

Thank you for your information, I have 60730 and the cast manifold cracked, of course not wanting to add to landfill what parts could you direct me to to make my own manifold. I am sure I can get the brass fittings and I have the gauges, just the regulator piece to control pressure would have to be added can you assist me on finding the right one?

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Author
Fix My Compressor Moderator
December 4, 2019 5:12 pm
Reply to  Richard

Use your browser to search for 1/8″ regulator, and you will find many. Or, visit a decent hardware shop that sells compressor parts like gauges, filters and regulators, and ask for a small 1/8″ regulator. That should do it. Like the one shown below:

Compressed air regulator

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don hopper
November 26, 2019 4:03 am

3gallon model 60637 plugged in one time blew fuse and plug a gfi socket , and now cant find fuse, why is this happening , bad batch or what

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Author
Fix My Compressor Moderator
November 26, 2019 9:07 am
Reply to  don hopper

If it’s new you have the manual. Can you check to see if it refers to the amperage of the socket into which the compressor is plugged? A blown fuse on the compressor could be related to that. If the GFI is opening to stop power flow, that’s suggesting that there is a much larger flow of electricity to ground on the compressor, and that suggests an electrical short.

If the amperage of the plug is within limits, yes, I’d think I’ve got a dud, and I would return it for replacement since it’s new.

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Anthony Theriot
November 21, 2019 12:45 am

Hi I have central pneumatic 2.5hp 21gal model 62803 and need help finding the uploader tube number 55 in the manual. I’ve been to several places that sell compressor parts and was told that harbor freight does not share information about their products. I also checked with a couple of harbor freight to see if can get a part number or someone point me in the right direction and no one could.

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Author
Fix My Compressor Moderator
November 23, 2019 9:01 am
Reply to  Anthony Theriot

Anthony, if that’s the tube from the tank check valve to the unloader, yeah, they are a problem getting. A couple of things you can do. One is to visit a good plumbing shop and they often can provide 1/4″ copper tube with fittings that suit the compressor. You may need to bring the old with you to be sure they get the right fittings. You can do this yourself, but copper tube is a son-of-a-gun to bend without a bending tool, and it kinks really quickly. Or, visit a high end industrial distributor and get from the instant fittings to suit, and a length of high-heat urethane tube. Easy to install, and since this line rarely sees heat from the compressor, it can handle the unloading process nicely. I have one compressor on which I did this, had the same problem as you getting a new tube, and have never had an issue with the polyurethane.

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Andrew M.
December 31, 2019 7:32 pm
Reply to  Fix My Compressor Moderator

Would 1/4″ OD nickel-copper brake-line work? Bends by hand without kinking.

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Author
Fix My Compressor Moderator
January 1, 2020 10:05 am
Reply to  Andrew M.

If you are speaking of an unloader tube, that would work fine.

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Jarno
November 19, 2019 12:09 pm

Hi.
I have a 2 hp 4 gallon (60567) compressor from Central Pneumatic.

Motor was stopping at lower and lower pressure and would restart itself again sometimes after 2 minutes on 0 bar. No breaker would jump or anything else.
Sometimes it would pump to 6 bar, sometimes to 2,5.
Expected Pressure switch failure, replaced with new one.
No difference yet. Seems the pressure switch works and gives power to the motor.
Breaker switch does not jump, no reset needed but the motor just has a mind of his own.

What to do?

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Author
Fix My Compressor Moderator
November 19, 2019 6:01 pm
Reply to  Jarno

Sounds like it is a power problem, Jarno. And that means a change in the power supply to the compressor, a capacitor may be failing, or mechanical issue with valves or the pump itself. Have a look at this page and read the pages that affect compressor pumping etc., and then add a comment if you still have questions.

https://fix-my-compressor.com/air-compressor-problems-and-fixes/

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Jarno
November 24, 2019 4:21 pm
Reply to  Fix My Compressor Moderator

Thanks, It probably is something in the motor/power. After several hours and spending 70US on a pressure switch I have donated it to somebody with more patience. Bought a new one. Thank you!

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Stephan Reuchlein
November 11, 2019 1:41 pm

Cannot find oil plug replacement nor the size. Need assistance in replacing the plug.

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Author
Fix My Compressor Moderator
November 11, 2019 6:17 pm
Reply to  Stephan Reuchlein

Model number of compressor, please?

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Stephan Reuchlein
November 11, 2019 7:10 pm
Reply to  Fix My Compressor Moderator

2.64 gallon 47413 central Pneumatic

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Author
Fix My Compressor Moderator
November 12, 2019 7:06 am
Reply to  Stephan Reuchlein

There are none that I can find on the internet. If you have not, please call Harbor Freight customer service at 1-800-444-3353, give them your compressor part number, and ask for the number for the dipstick. Also, what the dimensions are, both thread and lengthy. They may actually have one.

With that info you can google replacement compressor dip sticks and you will find a bunch. See if any of them fits, since the people that make the HF compressors also private brand many other compressor types, and many parts are interchangeable.

If not, visit your local hardware store, pick up a 1/4″ plastic male fitting of any type, and see if that’s the thread. Other threads on the compressor are NPT so with luck, this one is too. If it fits, put a small hole through it to allow air to vent, and you now have a plug. If you get the length from HF, you can use anything of that length to check the oil level.

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Stephan Reuchlein
November 12, 2019 11:19 am
Reply to  Fix My Compressor Moderator

I’ve tried multiple times, they cannot help nor can they provide the size or thread pitch. 1/2 inch will not fit as it is too big only slightly.

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Author
Fix My Compressor Moderator
November 12, 2019 5:50 pm
Reply to  Stephan Reuchlein

Hi Stephan. Sorry that HF didn’t help, though that doesn’t surprise me. Long on selling cheapest quality goods they can make, very short on after market support.

OK, you say the 1/2″ is slightly too big, yes? Did you know that the nominal OD is 0.533 for a 1/4″ NPT? So a 1/4 NPT is actually quite a bit bigger than 1/4″ and a 1/2″ NPT is .675″.

What was the actual NPT size of the fitting you tried? Was it 1/2″ or 1/4″ NPT? And, if it was an NPT, try the same size in a metric fitting will you?

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LEE
November 2, 2019 8:44 pm

I have a 21 Gal 2.5 HP 125 PSI compressor (model 61454) I bought about 5 years ago. I need to get a replacement Cylinder Gasket (part 16 from the manual). Any idea where I can get one?

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Author
Fix My Compressor Moderator
November 3, 2019 9:22 am
Reply to  LEE

Doesn’t seem to be any source that I can find either, Lee. I expect though that if you purchased some “high heat” gasket material from an automotive parts dealer, you could make your own.

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Brad
October 20, 2019 5:52 pm

I just purchased the 61454 CentralPneumtic compressor today from Harbor Freight. I followed al of the instructions making sure that oil level was proper. Initially the compressor would not start at all. After a few more attempts it would run for about 15 to 20 seconds then trip a breaker. I guess there is no factory acceptance testing done on these all. I will be taking this back tomorrow for refund and Not a replacement. I am very, very disappointed by the lack of acceptance testing is a thing of the past of I guess for this product as well as about everything else.

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Sonny
October 17, 2019 5:24 pm

I just bought a 21 gal 125psi upright central Pneumatic compressor at a Harbor Freight parking lot sale. It runs fine but wouldn’t build pressure over 40 psi. I checked the reed valves and one was broken. I order a new set and in the process of fixing it I broke the exhaust tube. Any idea where one could be bought from? Would it be worth it to try to fix it or just carry it back, I still have a couple of days to bring it back. I got it real cheap and I’m kinda thinking to just try to fix it. I will use it for air tools but not very often, just to work on my own cars some.

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Author
Fix My Compressor Moderator
October 18, 2019 10:27 am
Reply to  Sonny

Don’t know what you mean by the exhaust tube Sonny. However, based on your experience so far, if this were mine, it would go right back to the store and exchange or get a refund.

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Gene Lamar
October 14, 2019 8:01 pm

Hello i have a 2.5 hp 10 gal 125 psi central Pneumatic compressor , when i run it it runs for a minute then kicks off , even with valve open , i bypassed the reset and it ran fine and filked up to 125 psi , i then shut it off worried it woukd blow up lol Could i just need a new reset button ? Thanks Geneo

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Author
Fix My Compressor Moderator
October 15, 2019 8:36 am
Reply to  Gene Lamar

While it is possible the reset is the problem, the more likelihood is that the motor is overheating. What causes this? A too great load from the pump to the motor, like the pump is mechanically damaged and can’t cycle properly. Or, a pump head valve has failed, preventing proper air flow, and the motor is now running too long as a result and overheats, or, the motor start / run capacitor is failing and cannot any longer support the motor… or, you are using the compressor too long at one time and it’s overheating.

Based on what you’ve written you can likely ignore the last, and my guess would be a capacitor issue. If you see the page on general troubleshooting or air components, you will find info on how to check them.

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Timothy Boyce
October 13, 2019 10:06 am

I have 2.5 hp 21gal stand up pressure switch needs replacement, where to get one?

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Author
Fix My Compressor Moderator
October 14, 2019 10:04 am
Reply to  Timothy Boyce

Go to this page and scroll down to the pages about the pressure switch. You’ll find your answer there, I suspect. If not, add a photo of the failed pressure switch as a comment to this thread, please.

https://fix-my-compressor.com/air-compressor-problems-and-fixes/

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terry
October 10, 2019 6:46 pm

thank you for offering a place to post. I am finding that the valve that controls releasing pressure from the tank to the tool is not opening. Nothing changes, tho, unpredicably it worked for about 10 mins today…Any suggested fixes for that?

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Author
Fix My Compressor Moderator
October 10, 2019 9:44 pm
Reply to  terry

Not knowing the model of Central Pneumatic air compressor you have makes recommending a replacement impossible. If your question is about what I would call the pressure regulator, and if turning the knob does not change the pressure setting on the regulator gauge, and if the tank pressure is higher than the regulator setting, and pushing or pulling on the knob of the regulator does not reengage it, then it would be time to replace the regulator I would think.

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SCOTT O LINDBERG
October 3, 2019 8:19 pm

So I usually have to empty all the air out of the compressor before it will start and if it’s cold it is even worse I have the 2.5 21 gallon upright I was wondering if this ‘t’ fix would help if so pictures would be nice 😉

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Author
Fix My Compressor Moderator
October 3, 2019 10:23 pm
Reply to  SCOTT O LINDBERG

Scott, please visit this page and scroll down to the section about compressors that won’t start.

Emptying the air before starting suggests an unloader issue.

When you say ” I was wondering if this ‘t’ fix would help if so pictures would be nice” I’m sorry, I have no idea what you are talking about. Please clarify.

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SCOTT O LINDBERG
October 6, 2019 12:08 am
Reply to  Fix My Compressor Moderator

sorry I thought I was replying to the post about how the guy put a t in and two of the pressure valves because his wouldnt get going

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Luis
September 29, 2019 11:25 am

I have a central pneumatic air compressor model# 67847 2.5hp 21GAL 125maximum psi and it keeps shutting off right at start off I plug it in hit the on button runs for like 3sec and shuts off

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Author
Fix My Compressor Moderator
September 29, 2019 12:17 pm
Reply to  Luis

Luis, now old, well used, using an extension cord?

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Joseluis Perez
September 25, 2019 8:18 pm

I have the same one as Noel and every time we turn it on it’ll be on for a few seconds then the reset button pops out and it turns off.

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Author
Fix My Compressor Moderator
September 25, 2019 9:03 pm
Reply to  Joseluis Perez

That’s typically an overheating issue, and the overheating can be caused by a number of things, including power supply. Please look at the troubleshooting page, scroll down to the pages that address this issue, and then add a comment here with more questions if you still have them. Thanks.

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Noel
September 21, 2019 12:48 pm

I have a 21gal stand up or the central pneumatic and all of a sudden it stopped building pressure. I used it Thursday just fine started today and it wont build pressure. Help

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Author
Fix My Compressor Moderator
September 21, 2019 1:29 pm
Reply to  Noel

Noel, are you saying that it stops running, or that it’s running and not building pressure, please?

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Noel
September 21, 2019 1:41 pm
Reply to  Fix My Compressor Moderator

Sorry i should have bee more clear. It will run but wont build any pressure past 30. Once it gets to 30 it will continue to run but no more pressure will build. the picture is where the gauge will stop but the compressor will continue to run.

15690874976832886402278697268895.jpg
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Author
Fix My Compressor Moderator
September 21, 2019 2:20 pm
Reply to  Noel

That helps, Noel. That compressor symptom suggests a couple of things. If the gasket in the pump is failing, it may leak badly at 30 PSI and the air doesn’t get driven into the tank, but instead goes back and forth inside the pump. Or, it could be a broken valve.

Have a look at this page, and scroll down to the pages that address this issue for more specific help. Okay?

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Noel
September 21, 2019 2:40 pm
Reply to  Fix My Compressor Moderator

Would this be the problem or should I dig deeper. I think it’s called a reed.

1569091164919901989311708417082.jpg
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Noel Rivera
September 23, 2019 7:44 am
Reply to  Noel

THis was the problem. Compressor back up and running. Thank you for your help Willyr

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Author
Fix My Compressor Moderator
September 23, 2019 10:24 am
Reply to  Noel Rivera

Glad to have been of help. Have a good one.

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Noel
September 21, 2019 2:24 pm
Reply to  Fix My Compressor Moderator

Thank you. I will look into this and hopefully it’s a quick fix

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Paul Couchman
September 18, 2019 11:41 am

I’ve seen a lot of comments on the 21 gal Central Pneumatics air compressor with starting issues. I tried all the suggestions to get mine to start consistently – new cold start valve, new capacitor, checked the bypass valve. I cured mine by putting a tee in place of my cold start valve and then put 2 cold start valves into the tee. They still close at 2.5lbs of pressure but it takes a second longer to close allowing the motor to get up to speed. Working like a charm now . . .

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Petna Eveline
June 28, 2020 8:29 am
Reply to  Paul Couchman

where did you get the cold start valve?

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Author
Fix My Compressor Moderator
September 18, 2019 12:45 pm
Reply to  Paul Couchman

Excellent tip, Paul. Thank you.

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Gary Nowell
September 15, 2019 1:58 pm

I have a 10gal 2.5hp central pneumatic air compressor the oil fill cap blew off where can I get another one

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Author
Fix My Compressor Moderator
September 15, 2019 5:36 pm
Reply to  Gary Nowell

I just Googled “central pneumatic compressor oil fill tube cap” and found a bunch. Have a look if you haven’t already done so.

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Angie Whittington
September 15, 2019 1:26 pm

I have a Central Pneumatic air compressor #69669. Where can I get the three eared inlet valve reed?

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Author
Fix My Compressor Moderator
September 15, 2019 5:41 pm
Reply to  Angie Whittington

Angie, please upload a photo of the inlet valve reed you are seeking. There are non-OEM reed valves available, but I don’t know which is yours.

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Raymond Hubert Olson
September 7, 2019 6:20 pm

Just wanted to give everyone an update on what ive recently done to my troublesome 21gal 2.5hp compressor. So after the 3rd reed broke on me I decided to trace the good reed i had left onto a piece of .012 feeler gauge. I shaped it to match almost exactly and put it back together. Only this time i drained the HF compressor oil and filled with Mobile 1 full synthetic 5w 20. Also loosened up that start valve right next to cylinder head so it was still snug but not tight. Drilled 3 more holes in air filter housing. Since doing this it no longer trips either house breaker or motor breaker on cold start or any start thereafter. Is actually a useful compressor now. Tripping breakers and breaking reeds was a constant issue before. Havent had either happen since. Thought Id throw that out there to help others because HF most likely will not. Good Luck.

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James Phipps
September 7, 2019 2:04 pm

I have a 69669 air compressor. I nedd a compositor for it where can I get one?

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Author
Fix My Compressor Moderator
September 7, 2019 6:41 pm
Reply to  James Phipps

https://fix-my-compressor.com/finding-a-new-compressor-capacitor/

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Dan Santabarbara
September 6, 2019 5:17 pm

My central pneumatic compressor will run and build air but compressor won’t kick off. What is the problem?

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Author
Fix My Compressor Moderator
September 6, 2019 5:32 pm
Reply to  Dan Santabarbara

Dan, if you are saying that your compressor tank pressure blows by the normal cut out, and then the PRV lets go to vent over-pressure, that’s typically an issue with the pressure switch failing and not responding to the tank pressure.

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Dan Santabarbara
September 5, 2019 5:01 pm

My compressor will build air but not kick off it keeps running.

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Author
Fix My Compressor Moderator
September 5, 2019 10:43 pm
Reply to  Dan Santabarbara

Model number? What pressure does it build to, or, is it building pressure past the normal stopping point and blowing the PRV open, please Dan?

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Rodney Stavedahl
September 5, 2019 1:48 pm

I have a model #47065 21 gal and the compressor wouldn’t build pressure. I took off pressure switch and took it apart and noticed that the rubber diaphragm has holes in it. Where do I find a replacement diaphragm.

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Author
Fix My Compressor Moderator
September 5, 2019 10:54 pm
Reply to  Rodney Stavedahl

I very much suspect that you won’t find a diaphragm unless you craft your own. I expect you’ll have to buy a new switch, and since the switch of the 47065 is the same one as used on many other makes and models of compressors, visit your compressor store, look at the new compressors, find one with the same switch, and see if they have that switch in stock.

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Rodney Stavedahl
September 5, 2019 11:47 pm
Reply to  Fix My Compressor Moderator

I thought so. I found one on Amazon that is the same. Should be here on Saturday. Thanks.

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EDWARD POYA
September 4, 2019 1:37 pm

can’t get the Red Knob on the pressure regulator to screw down to adjust out going air
pressure. anyone with suggestions?

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Author
Fix My Compressor Moderator
September 5, 2019 10:56 pm
Reply to  EDWARD POYA

If lifting or pushing down on the regulator knob does not allow turning the knob to adjust the pressure, I suspect a failed regulator and a replacement is in order.

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Glenn
August 31, 2019 3:46 pm

That black “reset” button just sits flush in the housing it’s in. Doesn’t really push in at all. Zero pressure on guage, compressor never shuts off, just keeps goin. How can I address this?

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Author
Fix My Compressor Moderator
August 31, 2019 4:56 pm
Reply to  Glenn

The reset button likely won’t do anything unless the compressor motor has gone off on thermal cut out, if it’s the button I think it is.

The compressor never shuts off, and the gauge reads zero, if that’s the tank pressure gauge and not the regulator gauge, then the pump isn’t getting any air into the tank, or, you’ve got a major leak that’s bleeding air as fast as the pump can make it.

Please advise which, and, take a look at this page for the issues and page listed that cause a compressor to run and not build pressure, if that’s the problem: https://fix-my-compressor.com/air-compressor-problems-and-fixes/

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Raymond Hubert Olson
August 24, 2019 3:11 pm

I think Harbor Freight should exchange Model 62803 21gallon compressor for customers who got stuck with LEMON COMPRESSORS. Im sure they are engineered to last just outside the return policy window but if it gets even light use it will become apparent that it only looks like a functional compressor. I will not buy another big item from Harbor Freight until they show some interest in customer satisfaction.

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Byron Baker
August 28, 2019 3:55 pm
Reply to  Raymond Hubert Olson

True. It appears to have way too many failure characteristics.

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Byron Baker
August 23, 2019 11:47 pm

I have a Central Pneumatic 21 Gallon 2.5 hp 125 PSI Compressor. Air pressure would not build over 20 PSI. Replaced reed valves and it came up to 120 PSI and cut off as normal. As I released air with blow gun as pressure dropped , the compressor wouldn’t kick back on. Completely drained tank and again tried on off switch and it would not come back on.

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Author
Fix My Compressor Moderator
August 24, 2019 2:08 pm
Reply to  Byron Baker

Are you getting power to the pressure switch? With the tank empty, is power getting to the motor. Those are the first checks, please do so and let us know.

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Byron Baker
August 28, 2019 4:10 pm
Reply to  Fix My Compressor Moderator

Definitely have power to pressure switch. With empty tank, pressure comes up to 120 PSI and shuts off automatically. But when I release air down to approximately 70 PSI, motor tries to kick back in, but compressor stutters and trips reset button. Cleaned, checked, and slightly stretched cold start valve spring to hopefully allow easier start , but again with empty tank, started up fine with 120 PSI, released pressure, and got same results. Where do I go from here?

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Author
Fix My Compressor Moderator
August 28, 2019 4:23 pm
Reply to  Byron Baker

See the page on this site about checking the motor capacitor. If power is getting through the switch to the motor when the pressure drops, and the motor is struggling to start, it’s typically either the cold start / unloader valve or the capacitor. Unless, the motor itself has failed. Check the capacitor and let us know if you would.

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Keith Rieks
August 23, 2019 11:56 am

I have the 2.5 horse with a 21 gallon tank, 125 psi. When go to turn on it runs for about 5 seconds then kicks the reset button on motor out. Started out intermittently now does it everytime no matter how much air pressure is built up. It was bought brand new 2 years ago. Any help is appreciated thanks

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Author
Fix My Compressor Moderator
August 23, 2019 12:14 pm
Reply to  Keith Rieks

That typically signifies a power supply issue. Not using extension cord? If not, and the compressor is plugged into the same outlet where it worked fine before, then the next step is to check the motor capacitor. The how to do that is found in the troubleshooting pages on this site.

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Keith Rieks
August 23, 2019 12:16 pm
Reply to  Fix My Compressor Moderator

Thank you for the info. Yes plugged into same outlet as usual and no extension cord

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Richard Dennis Partos
August 14, 2019 1:02 pm

the thread where the unloader tube connects to the check valve ( on the check valve) is stripped- any way to fix? or where can I get a replacement check valve?. This is the 2hp 8 gal model. Thanks

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Author
Fix My Compressor Moderator
August 14, 2019 2:08 pm
Reply to  Richard Dennis Partos

Hi Richard. Dump all the compressor tank air, power down of course, and then remove the tank check valve. Google “replacement compressor tank check valve” and you’ll find many. Pick the one that matches yours.

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Richard Dennis Partos
August 14, 2019 7:33 pm
Reply to  Fix My Compressor Moderator

I was going to do that, but after seeing all the trouble people had matching the threads I just slathered the whole fitting with JB Weld.. Not very elegant I know.

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Author
Fix My Compressor Moderator
August 15, 2019 12:03 pm
Reply to  Richard Dennis Partos

As long as the repair holds, and the compressor works, who cares if it’s not elegant? Sometimes building a new manifold for a compressor is the only way around it when an OEM manifold cannot be found, and the end result will be ugly, but it will work. Good on you for making the repair, one way or another!

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