QT-5 will not start, after stopping on its own...

by Bill
(Fort Worth, TX)

HI, I was working in the garage with my QT-5 running a rotating mini sander for about an hour when the compressor just stopped running. I checked the fuse box, nothing tripped. Checked voltage at the panel; two legs of 120v coming in, voltage coming into the switch, and going out.


The compressor is used once in awhile, as it's a hobby machine for me so it does not get overworked. It is about three years old and looks and runs new. I know there are some thermal fuses somewhere, but can't find them (if they don't reset on their own). Needless to say, I haven't had this happen before.

Thanks,
Bill
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Howdy Bill. If the power is getting through the pressure switch to the motor circuit and nothing is happening, I would surmise that it was the start capacitor that has failed.

See how to test the caps on this site.

Cheers,

Bill

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Quincy 370 air leak

by Bob
(Iowa)

Quincy 370, Has air coming out of air filter after shut-down.
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This could be a rotary screw or a recip compressor, as the model number doesn't appear to be complete.

If it is the reciprocating model, and you have air blowing back out of the air intake when the compressor is off and the tank is charged, then I would also surmise that you have air coming out of your unloader valve as well?

The symptoms would suggest to me that your pump valves are failing, that air from the tank is bleeding back up the line from the tank to the pump head (suggesting a poorly seated or failing tank check valve) and since the pressure valve and intake valves are worn or failing, air is getting by them and back out the intake filter.

Bill

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Quincy 370 oil pressure comes and goes

by Rich
(Wilmington, NC)

I recently rebuilt a Quincy 370 two stage compressor. For some reason it will build oil pressure one time, or several times in a row, then just wont.

Without the oil pressure, the hydraulic unloader will not function properly.

I replaced the O-ring on the pump shaft, and installed a new hydraulic unloader, but the condition remains unchanged. Any ideas?

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