I inherited a large 220v Sanborn Compressor. I started it several times and it seemed to work fine so I ran air lines through out my garage and shop. When it was done, I flipped the breaker and ..... nothing. I got a humming sound for a few seconds and then it went silent. I've hit the reset button to no avail. If I turn off the breaker and then on within a few minutes, I don't get the humming sound until it's been off for a while. I'd like to turn the motor over by hand but I can't do that until I've removed the open cage protecting the pulleys and belt. Before I take off the cage, does anyone have any suggestions on what's going on with the unit?
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Sanborn Compressor Problem
- Thread starter tsanborn
- Start date
jrsulo
Well-known member
Is tank empty or full ??,,,,if full it might be under a load meaning it has a bad check valve or unloader
jrsulo
Well-known member
Or a bad capacitor
No residual pressure in the tank. A bad capacitor might be at fault. Where would the capacitor be mounted typically. I probably should have attached a photo of the unit. It is an old unit and NOISY when running so I don't reject sabotage by the neighbors (kidding, kind of).
could be a bad start capacitor or bad centrifugal start switch.
the capacitor could be under a domed shaped cup on the motor or under a plastic housing.
the start switch will be under the bell end of the motor .
some pics or a model number would help
the capacitor could be under a domed shaped cup on the motor or under a plastic housing.
the start switch will be under the bell end of the motor .
some pics or a model number would help
35Ford
Well-known member
Single or three phase?