Hyraulics on 3pt not working.. jumping/not lifting on ford 1900. Please Help

[dustyfontenot]

I just bought a 1981 Ford 1900 tractor. I did a full service. I drained the hydraulic oil where the filter is, the rear diff plug, and the transmission plug, then I cleaned the filter which surprising wasn't that bad. I also did engine oil and fuel filter. Well the first day everything worked fine for 3 hours. But on the second day the hydraulics on the 3pt on rear started lifting slow and started JUMPING when lifting up and will barely lift. I don't see any leaks.
Also the pump sounds like its cavitating. I used a universal hyd oil( Super S).

Any help will be much appreciated!!

 

[BukitCase]

Welcome to TBN - Did you re-check hyd levels AFTER you ran it for awhile? Symptoms sound like low level, some machines can get a LOT of air when doing full service, it's always best to "exercise" every circuit several times after filling, then re-check... Steve

 

[dustyfontenot]

Yes, I have checked multiple times. I even loosened the smaller diameter piping on the discharge of the pump (the big bolt on the front right of the tractor) I turned over engine to crank it for like 2 seconds and it sprayed about a 1/2 gallon of hydraulic oil. I then killed it and tighten it back up.

 

[dustyfontenot]

so after that I added more oil to fill it back up.

 

[Sawyer Rob]

Sounds like air is trapped in the system some place...

SR

 

[dustyfontenot]

Any tips on bleeding it?
I did some research on the Super S AGRI+PLUS hydraulic oil and it says not recommend for models later than 1974. So I will drain it, and refill with a different oil and maybe something will change.

 

[Jsheds]

I had a very similar problem with my Ford 1910. It turned out to be the piston seal on the 3 point hitch lift cylinder. Maybe the oil change is a coincidence. The seal is an easy fix if that turns out to be the problem.

 

[dustyfontenot]

where can I order new seals?

 

[Jsheds]

I got mine online from Messicks.

 

[5030]

Word of caution... Cheap hydraulic fluid is just that cheap. I bet your fluid is an issue. Buy some not so cheap stuff and refill it. Take the cheap stuff and use it for fire starter.

 

[dustyfontenot]

UPDATE: I replaced all the o rings on the banjo bolt on suction and discharge side( they were in bad shape) And I replace the gasket on the filter. I then replaced the super s hydraulic oil with travelled premium hydraulic fluid from tractor supply. And the hydraulics work awesome. It lifts like it suppose to and no more shaking...It was either the fluid or it was sucking in air from somewhere.. Who knows. But the good news is that it痴 working again!!