Weak hydraulics... I think.

[Marveltone]

This is regarding my Fordson Major Diesel, so I don't know whether to post this in vintage Ford or hydraulics. I'll choose hydraulics in hopes of getting more bites. Here goes.

Earlier this summer I used my FMD to disc a field. The disc (Kewanee 130) was raised via hydraulic cylinder. This was no problem, so I assumed everything was well. As it turns out, I have a mower conditioner (John Deere 1209) that needs a considerable amount of hydraulic pressure to raise. I cannot raise it, no matter what. The manual recommends 1300 PSI. We tested the hydraulic pressure at the rear remotes and only got 700 PSI. This seems rather low to me. Should it be higher? Is there a way to improve it?

Thoughts?

Joe

 

[J_J]

Your pump will try and pump volume and when something restricts the flow of fluid such as a cyl or motor, pressure is developed.

If you can't get the pressure then the pump is worn and bypassing or the cyl seals are bypassing. or both.

Sometimes you will not have the load to develop the full pump pressure.

You can improve that situation by rebuilding the pump and replacing the seals on the cyl's.

Perhaps a relief valve is stuck open and bypassing fluid.

 

[banjodunn]

G'day common thing for those tractors was for someone to want more pressure so they would shim the relief valve only problem then is that they are prone to cracking the alloy pump housing, hope that is not the case with yours.


Jon

 

[J_J]

If you cracked the pump, you would see the results real quick.

 

[Marveltone]

Anyone hare ever worked on a Fordson pump? I have a feeling I'd better find a shop manual.

Joe

 

[banjodunn]

G'day pump is mounted in the bottom of the trans so you will not see any leakage, been a fair while since I have done one but IIRC they bolt up through the bottom of the trans final drive housing. I will have a look at the shop manual tonight.
Just had a look and relief pressure is 2250-2500 psi and the top has to come off to get the pump out
Jon

 

[Marveltone]

Perhaps I would be better served by a new pump run off the crank in front of the grill. My uncle has a Major with a backhoe that is set up this way. Hydraulics are independent of the PTO.

Joe