Compressor pulls near 200 amps then trips circuit breaker

by nick maranta
(san jose, ca)

I have a 120 gallon speedaire air compressor model #5Z405D that is powered by a leeson 10hp single phase 220v farm duty motor. It will run for a few seconds sometimes and run properly other times before tripping the wall circuit breaker. The unloader valve seems to work properly. We have replaced all 3 capacitors with no improvement. When it fails, it seems to grunt or run with a deeper tone prior to tripping breaker. Both pump and motor spin by hand unloaded. Also it seems to run longer before failing with the air filters removed. Compressor was in storage for many years. We changed pump oil. It ran perfectly for 4-5 days before these problems started. Thanks a million for any advise.

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Nov 01, 2016
High Amps
by: Doug in s.d.ca

Not sure I understand - did you change the oil in response to this, or was that before you started it back up from storage?

Does it usually start OK, but then bog down?

Kinda sounds like you've got some kind of crud in the pump somewhere loading it down.

Or maybe crud in the motor shorting part of it out.

Can you run the motor with some load other than the pump? Or even no-load?

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