Help Me about old Quincy compressor

[davidhiep86]

Hello, Everyone,

I have a Quincy 310, 1950 vintage. I have it mostly rebuilt & about ready to try but am somewhat puzzled by the unloader circuit.
Any pictures or info I find on a 310 show the hydraulic unloader, actuated by oil pressure. On this system, there seems to be only 1 air line going from the hydraulic valve to the unloader tower.
On mine, I have centrifugal weights on the crankshaft that close the unloader valve after it is up to speed. Air is allowed to flow from the tank to the unloader when it is stopped, pushing down on the diaphragm & deactivating the valve.
There is a tee on the unloader tower. The line on the other side goes to what I believe is a check valve. What I haven't figured out yet is how the unloader pressure gets bled off after the crankshaft valve closes. Or does this valve bleed the pressure off itself?
Is anybody familiar with this system?

Thanks,
hiep

 

[Farmall 1066]

Lol! I have the same setup. Never fully understood how mine works either!
As long as it does, I'm not finding out either, as no parts are available for the centrifugal style unloader.

 

[BMAQCY]

Hello,

Due to the size limits on the website, I'm unable to attach the correct 310 parts manual. Please email me at [email protected] and I will email you the appropriate manual that provides you with the information to your inquiry. Thank you!

 

[rustyjames]

Wow, that's really cool that Ashley will provide that info. Hat's off to her!