Another Quincy 325-12 no oil pressure problem

[01birddog]

As in title i have a Quincy 325-13 that i have had since 1974 with no trouble at all. All of a sudden it stopped making oil pressure and was as a result not pumping air. I have worked on this thing until it is killing me to the point i bought another 325 and put it in this troubled ones place.

Here is what i had done prior to pulling it off.

1. New to me bearing support/oil pump but know good operation one. This is the vein pump.
2. Took apart and cleaned pickup screen
3. Removed and cleaned oil press relief in rear crank counter weight
4.Blew low pressure air through all oil passages
5. New compressor oil
6.Primed as best i could the system before trying a start


I have done the above like five times only to see a "0" on oil pressure gauge with a bypassing of air buildup. I have not taken hydraulic unloader out/apart as it in my thought is down stream of the oil problem. ANY thoughts on where to turn next is sure a help. On the bench now and turning it by hand it makes "compressor noise" but under power as i stated no oil pressure.

Thanks for any help,
01Birddog

 

[jim keris]

make sure the pump is set up to turn in the right direction you can install the ports backwards hence no oil pressure. The Quincy manual tells you how

 

[metalmagpie]

Can you buy a new oil pump from Quincy?

Did you drain the oil from the crankcase and then open the inspection plate and see if there's a lot of **** or metal shavings in there?

This is where knowing the service manager at your local Quincy service center pays off handsomely. You could call him and ask him what went wrong. I bet he can answer that question right off the top of his head. And tell you what parts you need to fix it. And maybe even let you look through their boneyard for the parts.

metalmagpie

 

[The Tool Tyrant]

Have you tried adjusting the oil pressure adjusting bolt? Perhaps it backed out?

 

[01birddog]

I have got my extra one up and running fine. Back to the troubled one... As i said it has a vane oil pump not the geared one. I found a known good one on line and took it apart to check condition which was exc. There is a insert in the cast pump body outboard of the rotor and four vanes. This is positioned with a roll pin in body to make sure this outboard insert with the ports in it is correct which it is. Parts of pump appear perfect with all springs, and machined back of body look fine.

I have had this off and on many times before i took this compressor off to replace it. i'm going now to try and figure out problem before i put it on another tank. I was sure the oil relief in rear crank counter weight was problem, i was sure also replacing the total bearing housing with pump would square it away. None of the above helped. Still was "0" oil pressure and there fore the unloader never called on the pump to start producing air.
I used air to blow out all passages,new Quincy oil and retried. Nothing. Also primed it with oil and squirt can.

I'm about ready to give up and shoot it.

 

[The Tool Tyrant]

Okay, I'm just throwing this out there as I've had things like this happen to me. # 1, you've already replaced the pump which did not cure the issue (time to wonder if the pump is bad to begin with) Gauges DO go bad, hydraulic unloaders DO go bad...I'd pull the unloader off your good pump and try it on the bad pump. The gauge could be bad, but in itself, has no bearing on loading or unloading.
It IS possible that it's just a bad unloader and a malfunctioning gauge. Stranger things have been known to happen!

BTW, the vane style pump also uses a pressure adjusting bolt...did you check it?
Did you verify that the oil passage from the oil intake screen to the oil pump is open?

 

[01birddog]

Checked at opening where oil pressure gauge goes with unit running and no oil pressure also tried the oil pressure relief spring/ball but nothing. I will try the hydraulic unloader off the good pump.

My problem is i guess thinking that the oil pressure is in fact the first thing needed in this 325 to get things going. Come up about 8/10 psi and this tells the unloader to do its thing. Boy this has really tested me.

I have tried by the way to get a service manual for this 13-14 Record of change model. I got parts but cannot get a service. Emails to Quincy haven't produced even a PDF copy.

 

[The Tool Tyrant]

Checked at opening where oil pressure gauge goes with unit running and no oil pressure also tried the oil pressure relief spring/ball

Are you referring to part # 38 on the parts list...which is the oil pressure adjusting bolt? Turning it in raises the oil pump pressure.

 

[01birddog]

Are you referring to part # 38 on the parts list...which is the oil pressure adjusting bolt? Turning it in raises the oil pump pressure.

No actually the pipe thread port where the oil pressure gauge goes. Took gauge out after all the priming and started for a second.....Nothing, no oil here and this is the passage downstream of the hydraulic unloader so it couldn't work.

This thing for some reason will not pick up a drop of oil to prime pump. This after hand priming with oil can until my fingers bleed.

Please keep trying as it is personal now.

 

[Stillgottimefor1]

Found a discussion on Yesterday’s Tractors saying”look for worn o-rings on the oil pump shaft at the end of the crankshaft. Worn aluminum gasket behind the nut at the bottom of the crankcase which holds the oil screen. Bad gasket between the oil siphon tube and the bearing carrier. “.

 

[Stillgottimefor1]

Could not post photo.

 

[01birddog]

Found a discussion on Yesterday’s Tractors saying”look for worn o-rings on the oil pump shaft at the end of the crankshaft. Worn aluminum gasket behind the nut at the bottom of the crankcase which holds the oil screen. Bad gasket between the oil siphon tube and the bearing carrier. “.

Good deal....I replaced the o-ring on oil pump shaft at end of crank. Going to pull it back apart since it on table anyway and check all the other things you mentioned. These parts looked good but i will replace with new parts.
Thanks.

 

[The Tool Tyrant]

I believe this may be the link to the forum discussion Stillgottime' is
referring to...'https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=127723

Regarding mention of the 'OIL SPILL VALVE', I have no experience with the older 325's, but looking at it's location, it appears that if it sticks, it may cause lack of oil pressure. According to the parts diagram, it is not a required part as the pump could be ordered with a 'plug' in it's place.
I would check it out, along with other suggestions in the above link.

 

[jfrancis]

Was this every resolved?

I have a Quincy 325-13 which I just overhauled due to no oil pressure. Still no oil pressure after the overhaul. I was beginning to think about that crank relief plug which I left in during the overhaul and maybe I should just replace it with a solid plug. Would that plug alone cause no pressure? I would think reduced pressure but there is NO pressure.