B109BL300-22SWC breaker tripping

by jim

Went to start my Sanborn B109BL300-22SWC after it had been sitting unused for over a year. The motor ran very slowly for about 10 seconds and then the outlet circuit breaker tripped. I reset the breaker and tried again, same result. Suggestions?

Comments for B109BL300-22SWC breaker tripping

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Oct 23, 2017
by: Doug in s.d.ca.

Glad you got it figured out.

Thanks for the update.

Oct 22, 2017
Fixed my problem
by: Jim

I was getting ready to try and work on the compressor and follow the suggestions provided on this site.

Since posting my problem on this site I also did some research about air compressors. A little background. My compressor was a part of my dad's estate that I received. There was no instructiom manual so I just plugged it in and used it when I needed it. Made sure I drained the tank when I was done and that was about it.

This last time I tried to use the compressor I was doing clean up after Hurricane Irma so things were messed up in my garage. I ended up plugging in the compressor to an extension cord rather that directly in an outlet. From my research I learned that was wrong and may have been part of the problem causing the breaker to trip.

So anyway I checked the oil in the compressor and it was fine. I also decided to use a rubber mallet and tap the motor housing in case there were issues there. I then plugged the compressor directly into an outlet and the unit worked perfectly.

Oct 18, 2017
slow motor
by: Doug in s.d.ca.

A few things:

First, make sure you can turn it by hand - if not fairly easy, remove the belt(s), and see if you can turn the motor and pump.

If that seems OK, then look on the motor for capacitors (I don't see any in the drawing, but they may be there) and test them. Here's how if you don't already know:


Let us know what you find, please.

Good luck.

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