1953 ford jubilee 3 point hitch not working

[rdjinny]

I'm about to throw the towel on this tractor, when I purchased the jubilee the arms would work when it wanted to, mostly after warming up and high idle.
I removed the top lid replaced the piston along with leather and rubber o ring, the unloader valve o ring, replaced safety valve, along with the pin that rides on the cam, adjusted the draft and position to specs reinstalled lid and nothing no movement! okay so it had a vane pump thinking it should be replaced, so I spent several $ on a new piston pump and lines, installed and bled the system and again nothing what could be the issue?
Back pressure vale? system relief valve? pressure tube?, I did start the tractor with the lid off and oil was coming out of the pressure tube assuming its working properly. I really don't know what the issue is any input would be appreciated

 

[Andy Wickiser]

I'm about to throw the towel on this tractor, when I purchased the jubilee the arms would work when it wanted to, mostly after warming up and high idle.
I removed the top lid replaced the piston along with leather and rubber o ring, the unloader valve o ring, replaced safety valve, along with the pin that rides on the cam, adjusted the draft and position to specs reinstalled lid and nothing no movement! okay so it had a vane pump thinking it should be replaced, so I spent several $ on a new piston pump and lines, installed and bled the system and again nothing what could be the issue?
Back pressure vale? system relief valve? pressure tube?, I did start the tractor with the lid off and oil was coming out of the pressure tube assuming its working properly. I really don't know what the issue is any input would be appreciated

Definitely check the backpressure valve. Unlike later models it's not built into the lift cover but rather in the center housing. You can check by taking a pressure reading under conditions outlined below, should be 40-45 PSI. I assume you have service manual(s), this from I&T FO-19.

 

[rdjinny]

I do have a manual, and I tend to agree with you definitely will do the test in a few days.
I’m running out of ideas I was thinking the system relief valve would be plugged up?
I wouldn’t know if I can get a replacement for the back pressure valve.
Thanks

 

[Geo-TH,In]

I do have a manual, and I tend to agree with you definitely will do the test in a few days.
I’m running out of ideas I was thinking the system relief valve would be plugged up?
I wouldn’t know if I can get a replacement for the back pressure valve.
Thanks

I replaced the cam follower pin. Use the expensive CNH 134 hydraulic fluid and put a pressure gauge in my pump.
Before I rebuilt the pump it would lose it prime. Where I installed the pressure gauge is where you can bleed the air out of the pump and lines.

 

[shaun wallace]

Is the rubber grommet in the side of cylinder?

 

[rdjinny]

Is the rubber grommet in the side of cylinder?

Yes I replaced with a new one

 

[rdjinny]

I replaced the cam follower pin. Use the expensive CNH 134 hydraulic fluid and put a pressure gauge in my pump.
Before I rebuilt the pump it would lose it prime. Where I installed the pressure gauge is where you can bleed the air out of the pump and lines. View attachment 107055

It was a vane pump, I purchased a new piston pump

 

[rdjinny]

Definitely check the backpressure valve. Unlike later models it's not built into the lift cover but rather in the center housing. You can check by taking a pressure reading under conditions outlined below, should be 40-45 PSI. I assume you have service manual(s), this from I&T FO-19.
View attachment 107049

Andy the service manual doesn’t say how to test the back pressure valve, just explains how it works. How would I go about testing?
Lid off ? On?

 

[Andy Wickiser]

Andy the service manual doesn’t say how to test the back pressure valve, just explains how it works. How would I go about testing?
Lid off ? On?

Take a pressure reading and if backpressure is 40-45 PSI or so it's working. This is done with lift cover in place.

 

[rdjinny]

Take a pressure reading and if backpressure is 40-45 PSI or so it's working. This is done with lift cover in place.

Okay so I’ll install a gauge on the top lid plug to get a reading?

 

[Andy Wickiser]

Okay so I’ll install a gauge on the top lid plug to get a reading?

Below is what I&T says about pressure test points (as described for a different test), or you could use the plug on the piston pump as George pointed out. Since you apparently not developing any high pressure, only back pressure, you could use a lower pressure gage for a more accurate measurement.

 

[rdjinny]

Below is what I&T says about pressure test points (as described for a different test), or you could use the plug on the piston pump as George pointed out. Since you apparently not developing any high pressure, only back pressure, you could use a lower pressure gage for a more accurate measurement.
View attachment 107119

Thanks Andy appreciate the help

 

[rdjinny]

Back to the ford jubilee 3 point hydraulics, I replaced the hydraulic back pressure valve reinstalled top lid everything on the piston has been replaced linkage adjusted to specs
Installed pressure gauge on the auxiliary lid started tractor bleed the piston pump as in pic but no pressure reading on gauge, what could be wrong?

 

[Andy Wickiser]

Back to the ford jubilee 3 point hydraulics, I replaced the hydraulic back pressure valve reinstalled top lid everything on the piston has been replaced linkage adjusted to specs
Installed pressure gauge on the auxiliary lid started tractor bleed the piston pump as in pic but no pressure reading on gauge, what could be wrong?

In your picture you have your pump pressure port redirecting pump output back to the sump. You won't develop any pressure that way, put the plug back in.

 

[rdjinny]

In your picture you have your pump pressure port redirecting pump output back to the sump. You won't develop any pressure that way, put the plug back in.

I was using the hose off the piston pump bleeding it of air, is that what you’re saying?
The plug is installed and same results.
I removed the gauge and started tractor and no fluid was present?
I removed side cover and as you cn see the movement, I stuck my hand inside and there was fluid coming from the system relief valve circled in pic is that normal or does it need replaced?
Thanks

 

[Andy Wickiser]

I was using the hose off the piston pump bleeding it of air, is that what you’re saying?
The plug is installed and same results.
I removed the gauge and started tractor and no fluid was present?

It's O.K. to use the hose technique to bleed the pump as long as it's removed and plugged before further testing. I looked at your videos, one appears to have flow in the relief valve area, I don't think that should be the case during normal functioning. There's a YT member JMOR that has helped a lot of people with NAA lift problems in the past. Use advanced search function to search for some of his prior posts using JMOR as the member name and NAA or similar for the search text. He might see this posting and offer his evaluation of your videos, or maybe you could send him a message requesting comment.

 

[shaun wallace]

There will be no pressure until a raise is made. It will only show what it takes to lift weight. Put a chain around lift arm and axle hsg . then you will get pressure when making a lift.

 

[JMOR]

i responded to your 'conversations' inquiry. But there is the picture with circled relief/over pressure valve here that I had not seen and will say that with backpressure tube positioned as you have it, both its discharge and overpressure are in almost the same spot, to me making it difficult to determine which the flow is coming from. Picture shows proper placement for backpressure tube.

https://imgur.com/qtFZfmb

 

[rdjinny]

That’s the orientation I have back pressure tube, while I had the tractor running I placed my hand inside and could feel the fluid shooting out from the relief valve, I purchased a new one and it’s still doing the same thing
I’m completely lost with what the issue is.

 

[JMOR]

"That’s the orientation I have back pressure tube,". Not in 201_a.jpg, it isn't.