I bought a nice ten horse quincy air compressor at auction. Worked there, not when I got home
First was electrical. installed new contactor and relaced burnt up wiring. Still no joy.
Went completely through head. Removed ten pounds of burnt carbon several reed valves and springs. Man was it a dirty mess. Still does not run, but I am close.
The unloader valve is not releasing. If I undo the unloader valve air line at the blue arrow in the top of quincy pic, the compressor begins pumping.
Look at the unloader valve assembly - side of quincy pic.
I think this stuff is for both an engine type compressor and an electric motor start unit.
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Now look at my tractor PTO unit. This compressor only unloads on high pressure allwoing the PTO to keep turning. Sure looks exactly like the parts in green arrows on the quincy.
Back to the side of the quincy. I want to verify this, but I am pretty sure I've seen compressors with only the bottom device (red arrow in side of Quincy view). So, am I right? all the stuff in the green arrows has nothing to do with starting unloader operation? So, it can be removed? FWIW, the valve ,orange arrow, is turned off.
That still won't get it working. My guess is replace the bottom, red arrow, unit. plumb it direct to the unloader valves on top the compressor.
I may be all wet here, sure would like to find someone that know how it is supposed to work.