Just bought a used Campbell Hausfeld 1.5 HP 11 gal. ''Super Pal'' 110v electric air compressor. Hasn't been used much in last few years. Has trouble starting under pressure (hums). Will start from 0 psi and go to 90 and auto shutoff, sometimes only makes it to 80 psi, then stalls (humming). Can't restart until about 15 psi. Same results in two different garages.
SOURCE: Air compressor motor stalls under pressure
this sounds like a bad pressure switch.if the unit is not shutting off at the same pressure each time this would be the cause.2 if the pressure is not unloading the air pressure on the compressor side of the unit it will cause the unit to struggle when it starts a cycle because the piston is under a load .how this works is say the unit starts from 0 psi when it get to the desired pressure you have it set on the unit kicks off . the other adjustment most units have on them is what pressure to cycle back on.so when the unit reaches say 100 pounds ,it kicks off and bleeds the air off the compressor side so when it starts back up it wont start up with pressure on the piston.
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Thanks for your reply. It turned out to be burned contacts in the
pressure switch, so the motor wasn't getting full current and didn't
have the umpf to start when there was pressure in the tank. The
unloader valve was working OK. When starting at 0 psi, in could
maintain enough momentum to reach shut off pressure. thanks again!
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