Husky WL650702aj fills up to about 80lbs then cuts out?

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What’s going on when a Husky WL650702aj compressor fills up to about 80lbs then cuts out? This compressor is most likely cutting out because it’s over heating. Here’s why.

Most compressor motors have a thermal cut out as a safety device. If the motor runs too long or against too much load, the motor gets very hot an the thermal cut out trips out, cutting power to the motor, to stop it from continuing to over heat to the point it damages itself.

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How can you tell the compressor motor is overheating?

Well, I suppose you could touch the motor but it’s probably too hot to touch and you could burn yourself in so doing, so don’t! Also, “too hot” is a subjective term. Compressor motors typically get quite hot when they are running normally, and a touch would not likely provide confirmation that a motor is “too hot”.

HUSKY WL650702AJ Air Compressor
Older HUSKY WL650702AJ Air Compressor

The best way to check if the motor is getting too hot is to shut the compressor down and let it sit for 30 minutes or so. Then, dump all the air  and it’s a good time now to drain the tank.  Shut the drain, wait 30 minutes to allow the motor to cool thorougly, and power it up again. It should start.

If it does, the odds are that it went off on thermal cut out.

The logical question then is why is it doing that?

Not enough pressure in the compressor tank?

If the tank pressure gets to the normal cut out setting, the motor on this Husky WL650702aj air compressor will stop. However, if the pressure in the tank never gets to the cut out level, then the compressor will run on and on until the motor goes off on thermal cut out, or until the motor fries.

Is the tank drain closed tightly and not leaking. Check, as that could be a simple reason. The compressor generates enough air into the tank to allow the pressure to rise, but the continuous draining of air never lets the pressure get past a certain level.

Any leaks anywhere else on the compressor?

Use a soap solution of 1 part soap to 10 parts water and brush this on all fittings including the manifold with the line from the tank to the regulator and to the gauges. No leaks?

Ensure that air is not leaking out of the unloader (part of the leak checking). If it is, the tank check valve is not sealing air in the tank and needs to be checked.

Feel around the compressor air intake port if it is accessible. Is air blowing out while the compressor is running?

If that’s the case it should not be bleeding air out. It suggests that there’s a bad valve in the pump head and that will have to be fixed to get the tank pressure up to where it’s supposed to cut out.

No leaks in the compressor anywhere?

If this is the case, it’s probably time to tear down the pump and install a pump repair kit for the WL650702aj compressor. As of the writing of this page repair kits are available on line. (Early in 2021)

Good luck with the repair and please post and tell us how it went.

By Ashley Pearce

As a passionate manufacturing and mechanical engineer, I've had my fair share of run ins with air compressors and compressed air systems. With over a decade of experience in the industry, I have both a fresh perspective and time-served hands and mind to help you with your compressor problems (along with our able community!)

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