On 11/21/2013 4:47 AM, wrote:
My air compressor quit working. The motor just hums and will not start.
The belt and comporessor unit are free. I can easily spin it by hand,
which means it's not the motor bearings either. The motor is a 120V AC
about 1/2 HP. It has a capacitor on top, so I'm thinking that is a
starting cap. How likely is it that the cap is bad? I guess the only
other problem would be bad windings, but that often causes smoke. I
dont have smoke.

Likely a run cap. And, yes, they are known
to go bad.

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Christopher A. Young
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