Question about Craftsman Air Tools & Compressors

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Craftsman model #919.165020 with GE motor SKCR49TN2312CX. starts fine with 0 air pressure but jumps up to over 80 amps trying to start with pressure in tank. tank check valve is working

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  • mikem1805 Sep 10, 2010

    actually there was no additional pressure relief, it was a faulty design which has the start capacitor mounted on the back of the motor in a plastic frame that also included a presure contact that i assume brings in the start capacitor. this was broken away at the bottom screw which did not allow for it to kick in apparently. another one of the many uses for a rubber tarp strap. thanx for trying though. m

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  • Craftsman Master
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The motor does not have enough power to overcome headpressure. Two areas to check for your problem. Valve plate in head (broken reed valves/gasket) or unloader not bleeding air out of system. Your compressor has a small valve under the pressure cut out switch that unloads the pump (bleeds air out of tube). It is actuated by a small arm that comes into contact with valve when cut out pressure is reached. Verify that air bleeds out of system when set pressure is reached. You will hear air escape for just a moment. You mentioned that the check valve is working (or holding pressure in tank, spray soapy water on valve with tube removed). If checkvalve is leaking, pump motor can not overcome pressure. If valve plate has leaking or broken valves, the motor will strain and the air will discharge at a very high temperature. Your pump can use sears parts or maybe even porter cable. Good luck.

Posted on Sep 11, 2010

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  • Master
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Hi,
There should also be a relief between the check and the head...this should relieve the pressure and is what has failed...
Not sure where exactly it is on your particular model, but you should be able to find it by following the piping back from the check to the head or it is built right into the head...

heatman101

Posted on Sep 10, 2010

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