Quincy rebuild help needed

[Tarnished]

Quick question for the Quincy folks...
From the following picture, can someone tell me where the copper tube should be connected?

I believe this ine is coming from the hyd un-loader, and I think it just reconnects to the tank pressure at some point. Is this correct? Should cause the hp valve to unload when pump gets to set limit and shuts down. (I think?)
I am looking for a parts diagram/installation manual, but haven't got the correct one for this pump yet. It is roc 102 if needed.

 

[redmondjp]

That is a Quincy 310, correct?

From my reading of other threads on this forum - you are correct - that other line should be plumbed into tank pressure. Additional expert opinions are welcome!

 

[Tarnished]

Thanks Redmond,
Actually the compressor is a 325. I think they call them QP's now??

 

[metalmagpie]

Learn how to download docs from Quincy's Web site. Write down your model number and record of change number, and download the service manual for your exact pump.

I doubt that line goes to tank pressure. I believe that the oil pump is supposed to run for a bit with the pump unloaded just to get things lubricated, then the unloader (the stack thingy up on top of your pump) releases and the real air pumping starts. This is controlled by a 1/4" copper tube that runs between the oil pump and the unloader valve. You didn't show the top of your air pump or I could tell for sure.

But really, read the manual.

metalmagpie

 

[Tarnished]

Thanks Metalmag, Guess I will have to spend a little more time on the Quincy web site. Didn't find what I needed there last time, but will take a better/longer look around.
If you look at the pic I posted, there are 2 copper lines out of the hyd unit. The one on the left goes to the top of the compressor, to the unloader. It is the second or right line that needs to go somewhere. Will try to post better pic.

 

[zkling]

Yes it goes to the tank pressure. The series is called the QR series, their flagship line, which where 2xx (single stage units) and the 3xx (two stage units). Of which your 325 is the most common, by far. Get a manual specific to your ROC, by either download or call quincy. There is a section on the hydraulic unloader control circuit (which that is) plumbing based on mode of operation you want to run.

 

[metalmagpie]

On the Quincy web site http://www.quincycompressor.com click "Download Literature". As I said, you need your model number and record of change to get your exact parts list.

MM

 

[Trey T]

Yes that goes to the tank; Quincy calls it "receiver"

 

[Tarnished]

Thanks all, appreciate the help. Was able to find the parts manual, thanks to magpie, and will now contact my local Quincy dealer for parts and filters.