Question about Craftsman Air Tools & Compressors
Does it have oil? take it back for a replaement. pull the belt off and see if the motor is still good. turn the pump by hand to check for free turning.
Posted on Apr 23, 2015
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Posted on Jan 02, 2017
The pressure switch has snap action contacts that are opened by a diaphragm pushing against a spring mechanism. Unplug the compressor and remove the cover to the switch and look for the contacts. Make sure that they are not welded together from use. Move the on/off lever to see if they open and close. You may have welded contacts or broken mechanism within switch. A factory replacement is expensive, however if you are a tinker-er you can use a lower price generic pressure switch available on ebay. Switches are sold by pressure range, you need a 120#. Fittings may need tweaking. Enjoy
Posted on Dec 12, 2008
SOURCE: air compressor not working
If your motor is running and not the pump, the malfunction is either in the pump or the coupling between the motor and the pump.
Some of these compressors are manufactured so cheap now that there can be just a set screw that is loose and the motor shaft is spinning free inside of the crankshaft.
If you drain the oil out of the pump and take off the pump crankcase cover, you should be able to see the problem.
Posted on Apr 15, 2009
Sounds like the compressor has failed -- probably the valve -- tear down and rebuild is probably the solution, or replace compressor, or just buy another unit. My nature would be to tear it down and see what's going on.
Posted on Mar 23, 2010
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