Question about Craftsman Air Tools & Compressors
I have an older craftsmen air comp that I would like to use as a back up but it has a problem. It will come up to pressure fine and you can use it. But when it tries to re-start after the pressure drops, it seems to have a hard time turning over and stalls out. You can hear the motor trying to turn but it does not. I removed the motor and cleaned the contacts but it still does the same thing. Rick.
Rick, I have come across this problem before and was related to the unloader mech. Follow the air discharge hose to the tank. There you will find the brass in-tank check valve. The check valve will retain pressure in the tank and not allow it to leak back and load the compressor. To test the valve, with pressure in tank, back off the air supply line from pump and check for leak. If leaking remove valve and clean debris or replace valve. Secondary to this valve is the unloader valve in the pressure switch. From the brass checkvalve follow the 1/4 inch line to the switch where you will find somewhat of a tire stem valve that is mechanically opened by a lever on the pressure switch. Make sure that when the compressor cycles off, the remaining air is the lineis unloaded at this stem. Make adjustments as necessary (by bending a small tab that depresses stem ). Good Luck with your repair and email if you have questions.
Posted on Apr 23, 2009
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Posted on Jan 02, 2017
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