Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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I have a Craftsman 1 hp, 3 gal air compressor model #921.153101 that wont pump air, the motor runs fine, the hose is clear what can I do to get it running?

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Remove the air filter and see if the inlet is sucking air if so the unit is pumping,if not the valves could be bad or the piston is broken.

Posted on Apr 29, 2010

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Air compresor Craftsman 921.153101 it spound like is one but it wont run at all. It sounds like the motor is stuck


if its belt driven ,unplug it(safety first)remove the belt and try to turn the pump by hand.if the pump turn plug it back without the belt. and try it .if the motor doesnt run.check the contacts on your pressure switch.if they are ok and try again.if not you need a new motor.if the motor ,the pressure switch contacts,and the pump are fine.put the belt back back on bleed your tank to zero with an air gun and try to run it.if it work well till it cuts of check if your bleeder release air.you might have pressure stuck in your pump.the compressor needs to release pressure for a soft start.hope this help!

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As the pump is running try spraying all the fittings with soapy water and look for bubbles. Hope this helps. Good luck.

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