Question about Craftsman 15 gal Air Compressor 3 hp UMC Horizontal k Oil Free Pump
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Posted on Jan 02, 2017
Check the reset button on the motor to see if it tripped. The motor may be overheating. Some motors have an internal breaker and they have to cool off before they restart. Also check the pressure switch. Move the switch back and forth ( on and off ) and listen for a click. If it doesn't click with low to no air pressure then the switch is bad.
Posted on Dec 30, 2008
It sounds like you may have a broken reed on the diaphragm plate. This is located at the block. Remove the cover, and look for a cast metal assembly with fins. It will be attached to the side.
Posted on Apr 23, 2009
The compressor valve may have a faulty gasket or seal, and maybe leaking air internally. Or the compressor might be going downhill. You can try to replace the valve seal and see if that makes a difference, otherwise you need to replace the compressor.
Posted on Aug 27, 2009
You should not have air coming out of the vent cap. From what you've stated here I believe your piston rings and/or cylinder are damaged to where air is getting past them and going back into the crank case. It's possible you have a frozen valve plates so check them on your way to the piston and cylinder.
Posted on Sep 09, 2010
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