electric motor on my compressor turns slow an trips the breaker was working fine the last time I used it.

by gary
(Ponca City, OK.)

33 gal. 11.9cfm. craftmans. A.O.smith motor. 115V rpm3450 mod. 919.167340. motor turns slow then trips breaker work fine last time it was used. how many ohms should this motor show on meter. ITs showing 3

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Bill says...

I don't have the spec for that, Gary.

If you go to www.searspartsdirect.com and input your model number, you can see the parts diagram and parts list.

You can also (if during business hours) chat on line with them. I would ask if that info was in the manual before I ordered one, or, just if they knew what that was.

What is the pressure in the tank when "motor turns slow then trips breaker"? On cut in with pressure, or even when the tank is empty?

If no change in the power supply to the compressor, then check the intake filter to make sure it's clean, pull the line from the pump head to the tank and see if the compressor runs OK then. If so, apply gloved back pressure to the fitting or port in the pump head to see if this causes the motor to lug. If not, pull and clean the check valve, then try it again.

Cheers,

Bill