Sears compressor unable to re-start

by Barry

Once the pressure gets below the threshold, it attempts to restart then blows a circuit breaker. I thought maybe it is the unloader valve(choke valve). There is a tube from the unloader valve to the on/off switch. I disconnected the tube that runs to the on/off switch at the unloader valve and the compressor will start back up under pressure but with it connected it attempts to but it cannot. Once the tank is empty it will start back up. I checked the capacitors as you have suggested and one will charge back up from the meter and one will not. The one that will not, does show that it is a good circuit but will not charge up. Soooo is it a capacitor issue or an unloader valve issue???


Barry
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Barry, please have a read of the Unloader Valve page on this site, making sure you understand how its operation fits into the compressor requirements, and then check and make sure yours is working properly.

If the unloader valve is not working, that adds a lot of load to the start up, and a weak capacitor may be part of the problem.

Eliminate the unloader valve malfunction first, if that's what is happening, and then target the capacitor.

Cheers,

Bill

Comments for Sears compressor unable to re-start

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Jul 20, 2013
choke valve
by: Troy

How do you test the choke valve?

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Compressor runs as long as there is no pressure in tank

by Bob
(Miami, Fl)

Model 919167312 crafsman compressor with a 1 hp A O Smith motor. When there is pressure in the tank the motor will not start and breaker trips at panel.

I replaced the choke valve on the tank and the start capacitor on motor, but still have the problem. ( as long as the pressure line going into the choke valve is disconnected the breaker does not trip )

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Bill says....

Bob, my read on your compressor complaint is that your unloader valve is pooched.

Check out the Unloader Valve page linked from the site map for details.

Maybe let us know if this solves the problem?

Cheers,

Bill

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