pump binds up at 15psi

by Don
(Seattle wa.)

older sears compressor 919.158221--when it hits 15lbs the pump binds up --when I release the pressure the pump wheel is free and easy

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Bill says...

Binds up as the motor is stalled, Don? Or binds up as in slowing?

Unless the pump is pooched, or the motor is, then the first thing that comes to mind is the check valve into the tank. If, somehow, the back pressure created by 15 PSI in the tank is preventing that check valve to function properly, the back pressure in the line to the tank might stall the pump.

Check out the check valve first, then let me know. Make sure you dump the air before you open the lines.

It would be useful if you could give me your answer(s) as a comment here, so that I can follow our discussion as we try to figure out what is happening (or not happening) with your air compressor.

Cheers,

Bill