Quincy 325 Roc 13

[Bigwheel74]

Hi and this is my first post here so please bear with me. I have a Quincy 325 Roc13 that I picked up as a project and new addition for the shop. I just got it running and had no oil pressure. This has the vein type pump that can turn in either direction. I put a brand new motor, pulley, and magnetic starter on it as well and set it to spin ccw based on the arrow on the compressor pulley fan blades. When i run it CCW it doesn't build pressure. BUT will in the CW direction. By adjusting the pressure relief I get a quick 20 psi out of it. The problem I have or keep asking myself is that the direction of air flow across the intercooler isn't correct per my quincy service guy. To get pressure it had to pull air across the pump and intercooler. Doesn't seem very efficient and besides when I run it the other way it does push alot of air. The race that the oil pump veins ride in seems to be pressed into the casting and doesn't move. I thought maybe I need to flip the large pulley 180 degrees but the way it is now is how I took it apart. I also have a spare to look at and compare. If flipped I think there would be a clearance issue between the big pulley and intercooler. Not to mention the crank pto will most likely be recessed in that larg pulley. Let me know your thoughts. Thanks chad.

 

[MEngineer]

I have a 325 roc 14, practically the same pump, but I cannot picture what you are on about. Sounds like you are trying to get the oil pump to pump oil while spinning it in the wrong direction.

If so, I believe that when you assemble the oil pump you must index part of it...don't remember which part..to align a different orifice set.

If that doesn't make sense at all, post up some pics!

 

[Bigwheel74]

Here is some pictures of the pump side and cover removed. There is a port at 2 o'clock and one at 9 o'clock on the race that the veins ride against. Of course they would be off 90 degrees.

 

[redmondjp]

Reading from "QR-25 Series Instruction Manual, 52201-105, June 1999", page 26:

"Pressure lubricated QR-25 series compressors can be modified to operate in reverse rotation with exception to the Models 206 & 210."

It then lists four steps involved in the process, which involves unbolting and rotating the oil pump housing by 180 degrees, as well as moving the pipe plug to the bottom port position after reclocking. You are also supposed to then install a reverse rotation flywheel such that it blows air onto the pump.

It sounds like somebody has done this modification to the pump but didn't spring for the new flywheel ($$$). I'd put it back to normal.

You can download this QR-25 Series Instruction Manual from the Quincy website for free.

 

[Bigwheel74]

Hi Guys, thanks for the help so far!!! Unfortunately, when Bought this unit it was sized up because the previous had a mishap and the drain got left open. Oops. Needed all new bearings, rings and gaskets.

This unit DOESN'T have the newer spin on oil filter/pump cover. I've got the older one piece style with the vein pump machined into the casting/bearing support. I posted a couple pictures of it. This is what i get for buying a compressor that wasn't running. But where's the challenge in that.

 

[MacMcMacmac]

In theory, the friction of the vanes is supposed to rotate the race in the direction of rotation so it automatically uncovers the correct ports. In reality, this almost never works, so get a center punch and sharpen it good, then lightly tap the ring in the direction that the pump rotation would turn it until it stops moving. You should be ok after that. There is a roll pin in the crankcase that rides in a machined notch in the outer edge of the race that limits the rotation of the ring to the correct amount.

 

[Bigwheel74]

I swear up and down I read that somewhere while searching online for a resolution. I will give it a try this morning. Thanks.

 

[Bigwheel74]

That was spot on!!!! Thanks again for the help on this. Just a few light taps and the race moved freely in the proper direction up to the stop. Oil pressure is good and the air flow is plenty. Thanks.

 

[Trey T]

I have a Champion compressor that's a direct competitor to the 325 and your pump is a freakin tank. Congrats on the new compressor

 

[MacMcMacmac]

I swear up and down I read that somewhere while searching online for a resolution. I will give it a try this morning. Thanks.

I might have written it

Glad it worked out ok.