2000/3000 hydraulic relief valve

Hey all, back again with the hydraulic issue on the 1966 2000 3 cyl diesel. Just to recap, when I bought the tractor, the lift worked a few times then quit. Changed all the hydraulic fluids, worked again for a few times. Did a top cover rebuild, removed and cleaned the suction filter, replaced the return filter. While I had the cover off, I pulled the check valve from the front of the top cover to inspect the ball and seat, never pulled the seat, as all looked good and clean. Put everything back together, refilled with fluid, bled the pump. Lift would come up, but not with a load. Upon advice and suggestions received from from my previous posts, I have rebuilt the pump (twice, first kit was for the 4 cyl model), replaced the system relief valve at the bottom of the sump, and still, will lift but not with a load.
Now for the kicker... When I pulled the pump off last week to rebuild with the correct kit, I noticed a small part laying on the left running board. Looked like a spring seat of some sort. Only thing I could think of was it was part of the relief valve assembly from the front of the lift cover, but I never pulled the relief valve with the cover on the tractor, and I had the foot board removed when I had to remove the PTO shifter to get to the suction filter...
I looked through my FO-31 manual, the drawings didn't show that part anywhere. This morning, I did a google search and found a picture someone posted a couple of years ago of the exact part I found, which I'll try to post.
The piece I found is on the right side between the spring and ball seat, which appears that it has to be installed before the seat. Remember, I never pulled the seat out, but there is evidence that a po has.
Now, is there any way possible that that spring seat could have come out without removing the seat??? Could that prevent the lift from lifting a load (seems to me it would)?

Sorry for the long post, but this hydraulic issue has really tested my patience and what little experience I have with hydraulics on these newer tractors (newer than my 1952 8N anyway).

Thanks,
Roger
 
(quoted from post at 10:26:24 10/14/17)
<image src="http://forums.yesterdaystractors.com/photos/mvphoto4716.jpg"/>
Okay, here's the picture.
here is no relief valve parts in your photo. What is pictured is the check valve to the left and the backpressure valve to the right. Without sufficient backpressure, I am surprised that the unloader valve could operate so as to result in lift. Perhaps there is such a part installed and what you have found is a discarded item. Or maybe not. Maybe some incorrect part is in its place. Disassemble and see what is there.
 
Thanks for the reply JMOR. I am sorry about the confusion, I meant to say Check Valve, not relief valve. What is strange is that I had that running board off the tractor before I checked everything, and then found it... Perhaps it was just sitting somewhere and it rattled off and landed on the foot board.. I don't know. Anyway, I'm gonna try to get the seat out this afternoon and inspect everything. I sure hope that has been the problem all along...

Thanks again,
Roger
 
Okay, JMOR, hope you and everyone else are still on.
I got the check valve seat removed. Looked into the bore, nothing else is there. I took some pictures of what I removed, couldn't get a good shot of the bore, but maybe this will help. The original picture I posted is of a 641 check valve. The parts catalog shows the spring and back pressure valve for the 641, but not the 2/3/4000 pages. I'm totally stumped now.
The first picture is of what I removed, the other pictures are of the part I found on the running board.
As always, all help is appreciated...

Thanks,
Roger
mvphoto4729.jpg


mvphoto4730.jpg


mvphoto4731.jpg


mvphoto4732.jpg


mvphoto4733.jpg
 
(quoted from post at 19:39:47 10/14/17) What is the number cast on lift cover? NCA or C5NN ? is there a big plug on left side looks could be fill plug?

Shaun and JMOR,
Thanks for the replys. Shaun, the casting number starts with C5NN and if you'll look at the first picture dated 10/14/17, you can see the plug that screwed into the top cover holding the guide, ball, spring, and housing in the lift cover.

JMOR, I tend to agree with you. However, the bore inside the top cover looks to be the same size all the way down, don't see how the spring and back pressure valve would be held into place to mate up with the valve seat. But then again, I just don't know...
Any ideas?

Thanks for all your help guys,

Roger
 
yes. Im afraid that Shawns question has jogged my memory. Im not at home where I can check my references, but on yours, the backpressure valve is probably located elsewhere. Sorry . Shawn will likely point you, but I think around the exhaust filter.
 
Shaun,
No other plugs either on the lift cover or sides of the sump. As JMOR said, the parts manual does show a back pressure valve on the sump return line at the filter, but the drawings do not show the type of valve the I have. I did find a photo of a 3000 series that looks like mine though. And again, when I replaced the return filter, everything was done in the shop, not on the tractor. I am so confused!!!

Hopefully this link will take you to that picture.

http://www.tractorbynet.com/forums/files/hydraulics/437382d1439384163-ford-3000-hydraulics-image-jpg

Thanks,
Roger
 
At this point, I would say to forget that stray part as it appears unrelated to your tractor. Start over, looking for reason for no lift.
 

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