Question about Craftsman 33 gal Air Compressor 6 hp Horizontal k Oil Free Pump

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I have a 30 gal 5.5 hp oil free Craftsman air compressor. It was brand new several years ago but never used it. It set in the original box in the garage. Went to use it today and when plugged in to start break in process it just hums. Got any ideas. Thanks PJ

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Are you a mechanical type person? There is a fast and easy way to test the motor but it is not recommended for anyone who doesn't do this for a living. I have replaced 4 shaded pole motors in the last 3 years that did the same thing and never had a problem with a capacitor start or capacitor start/run motor. If the motor hums, it is trying to run. Try giving the stator help getting started while the motor is humming. Use a small piece of wood or soft plastic. Any non-conductor will do. Look inside the rear of the motor and you will see the field coils around the outside surface and the stator is the round thing in the middle of the motor that rotates. Use the non-conductor to start it turning in the direction it would normally run while the motor is humming. If the motor starts and runs ontill the pressure switch shuts it off, the motor is bad. If it has a capacitor on it, try replacing that first. Please let me know how this works out for you.

Posted on Apr 02, 2011

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