Compressor starts to build pressure than stops

by Don
(C.T.)

Hi A I have an old Craftsman conpresser and the pump broke A rod.

So I replaced the air pump and it would not build over 80 psi it would start to slow down and just stop.

I checked the check valve and than replaced the cut out/in switch and the same thing happened so I replaced the motor now it builds to about 90 psi than the same thing happens. Any help in solving the problem would be great. Thank you Don.

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Bill says...

Hello Don. It sounds like the load is building to the point that the motor cannot exceed it, and grinds to a halt.

Yet, if that happens, usually the motor will draw more and more amperage until the breaker trips.

When it comes to a stop, is the motor still trying to go? Is it getting warmer?

Or, is it reaching a certain pressure and then the pressure switch trips out and stops the motor?

Cheers,

Bill