Compressor won't start when it's hot

by Dan
(Minneapolis)

I have a Speedaire compressor model # 4B227C that will run fine when it's cold, but once the pump gets hot it trips the breaker. I had the motor checked, and no problems with it. Now I've taken apart the pump and no cracked pistons, no worn rings. Not sure where to go next.

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Bill says...

Dan, in the absence of an motor or start/run capacitor failing issue, and if the mechanical side of the air compressor is working normally, then that only leaves your power supply.

An electric motor that is underpowered electrically will both run hot and fail sooner.

Make sure your power supply is not compromised by other devices pulling power from the same circuit at the same time your air compressor is starting or running, and that you are NOT using any extension cord except a heavy duty (12 gauge?) model.

Cheers,

Bill