Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k
It just hums when turned on
There are several things that can cause your problem. Using an extension cord of insufficient rating, a failed capacitor, a failed motor and last a faulty unloader valve.
The extension cord is easy to check so I'll skip it.
The unloader valve is easy to check. It will cause this problem when the unload fails to discharge the pressure remaining between the tank check valve and the cylinder. It is the sudden release of pressure when the tank has reached it's max psi. If it doesn't release the piston has to work against the max psi. from a dead start. Most of the time a compressor will run really slowly then trip the breaker but your compressor is well please don't take this personally it's a girlie compressor.
Simply loosen one of the fittings on the tubing that run between the compressor head and the switch to bleed off any pressure manually.
If you have no pressure release then most likely it's the starting capacitor.
Below is a link where you should be able to get a new capacitor.
However I would like you to remember this your compressor is not built to last. In fact it is commonly referred to as a throw away. So before you spend anything you might want to ask yourself how much do you use it. If you use it a lot now or are planning on using it more in the future you may want to replace it with something a little better built.
Hope this helps
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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