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?
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?
OK, here are some pics of the beast. Not sure if it's single or three phase. I'd love to get the old Sanborn going, not the least because that's my last name. Nope, no relation but I can always lie about it. I'm guessing the capacitor is under the tan and grey plastic box in front. I open it up tomorrow and report back on what I see.
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Cruzan80
Well-known member
Grey box in front is the pressure switch, and possibly disconnect. The capacitors are in the squarish "hump" on top of the motor. Open that, look for markings on the tubes, order and swap them out.
You would know if it was 3ph, as it isn't common in residential households.
You would know if it was 3ph, as it isn't common in residential households.
you'll find the capacitor(s) under here
