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I have a magna 3 HP that seems to have the pump binding up. I get little pressure in the tank (before the regulator).
Good oil level in compressor
Turns by hand okay
Will smoke the belt if left on.
Post moved to this page. Nick, if the pump turns by hand OK, and if it runs OK when the pressure is low, and the motor is able to “smoke” the belt when trying to turn the pump, that suggests back pressure from a filling tank may be causing the issue. That points to a blocked tank check valve, or a blocked pressure valve. Tackle the tank check valve first as that’s easier, and then if that doesn’t resolve it, you may need to pull the pump apart. Make sure the tube from the pump head to the tank is not blocked in any way either. See the troubleshooting page on this site for links to pages with more details. Good luck.