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Ford 4000 Rear Lift Hydraulics

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AGSC2021

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Hi All,

I recently purchased what I believe to be a 1964 Ford 4000 4 clyde diesel (the SN is basically uninterpretable, but based on my research, it's definitely pre 1965). I'm having problems with the rear hydraulics. They seem to be fixed in the up position regardless of what I do with the position lever. The only way to drop lower the lift arms is to use the selector block to release the pressure.

I've rebuilt the pump since it started leaking and have hydraulic pressure. It will lift the bush hog I have on back, but I can really only control the direction with the selector valve and not the position lever which is less than ideal. I've pulled the selector valve and noticed a missing oring on the plunger which I plan on replacing.

I apologize if this has been covered in a previous post, but I haven't been able to locate anything covering this particular issue. Does anyone have any insights on what might be the culprit here, and what might be involved to fix this problem. It would be great to have some feedback before I crack the top lod and start exploring.

Thanks,
AG
 
(quoted from post at 18:56:52 11/17/21) Hi All,

I recently purchased what I believe to be a 1964 Ford 4000 4 clyde diesel (the SN is basically uninterpretable, but based on my research, it's definitely pre 1965). I'm having problems with the rear hydraulics. They seem to be fixed in the up position regardless of what I do with the position lever. The only way to drop lower the lift arms is to use the selector block to release the pressure.

I've rebuilt the pump since it started leaking and have hydraulic pressure. It will lift the bush hog I have on back, but I can really only control the direction with the selector valve and not the position lever which is less than ideal. I've pulled the selector valve and noticed a missing oring on the plunger which I plan on replacing.

I apologize if this has been covered in a previous post, but I haven't been able to locate anything covering this particular issue. Does anyone have any insights on what might be the culprit here, and what might be involved to fix this problem. It would be great to have some feedback before I crack the top lod and start exploring.

Thanks,
AG
Click to expand...
am assuming that "selector valve " is the Selec-trol valve used to direct hydraulic output to some auxiliary device. Without knowing that & how it is connected, I can only suggest that perhaps the unloader valve is stuck and applying pressure to your lift even as you try to lower it and that the pressure overcomes the dump passage ability to flow adequately to dump the cylinder with the input flow still present. If you stop the engine, will the lift lower using only the touch control?
 

When I cut off the engine with the lift up, the only way I've been able to drop the lift arms is to release the hydraulic pressure using the valve on top of the top lid. That valve is a blue block that sits in top of the top lid directly under the seat with a plunger on the front and what looks like a pop off valve on top. On the bottom side that mates with the lid there are eight or nine interconnected passages to divert/bypass the hydraulic fluid. I'm not certain of the name, but replacement parts I've seen were listed as selector valves.

Thank you for your help!
 

Sorry, I'm somewhat new to this. What I was calling a selector valve appears to be the knock-off plate upon further research. That unit has the plunger I was using to relieve the hydraulic pressure to lower the lift arms.
 
(quoted from post at 22:03:58 11/17/21)
Sorry, I'm somewhat new to this. What I was calling a selector valve appears to be the knock-off plate upon further research. That unit has the plunger I was using to relieve the hydraulic pressure to lower the lift arms.
Click to expand...
orry to say, but I thought I had seen about all there is to see in this area of hydraulics, but do not know what this" knock off" plate you refer to is??? A standard factory Block off/accessory plate has no control on it, just a plug to be removed if used as a test port.
Where is the fluid going when you operate this thing to lower lift? Post pictures, please.
Std Block off or accessory plate plate:
SPB82ug.jpg

and Selectrol valves:
nUyS3fw.jpg

gmf9AUq.jpg
 
I would agree with JMOR about the unload valve. When working on
tractors with (say) a plough stuck up in the air, I have eased
the plunger/selector valve a little bit at a time and allowed the
ram cylinder oil to bleed passed it and lower the lift without
damaging the implement or getting covered in hydraulic oil.

Think you need to remove the lift and free the unload valve. If
it needs a new O ring use a genuine Ford one otherwise you will
have the same problem in a short while.



This post was edited by Majorman on 11/18/2021 at 01:00 am.
 

Sure enough! It was stuck. I don't see too much damage on the valve. I guess I'll lube it up, replace the seals and fluid, and try it out. Any other recommendations while I've got it taken apart?

AG
 
JMOR,

The lift cylinder shown for this '64 4000 in the photos looks very much like the c5nn477b replacement cylinder available as an aftermarket part. Several of the Vendors say the aftermarket c5nn477b will work on ford 801. Do you have a take on this?
Sorry to cut in to this discussion with a different question, but I'm having no luck with used OEM cylinders for my '58 801 and need some advice before making a leap to the new aftermarket part.
Thanks.

Tom
 
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