Hydraulic problem Ford 3000

[sam un ont]

I am working on a friends tractor which Is mostly used to run a hay binder via remotes. He states that initially it will work fine for about 30 minutes ,then get slower and slower until he loosens the plug on the lift cover remote and lets some fluid out.and then it is good for maybe 10 minutes.He is not sure if it is just fluid or some air that shoots out.
I have pulled the lift cover and cleaned the suction filter and replaced the return filter, replaced the o rings at both ends of the suction and return lines.
The filters were actually ptetty clean and the fluid other than dirty and black had no milky look.
Since I could find nothing that I could nail as the problem I am hesitant to put it together and until I talk again to the owner I do not know whether there it is sucking air or there is a blockage of some type
any help or ideas are appreciated


sam

 

[sam un ont]

Spoke to the owner for more clarification and he states that iniitally everything will work fine for maybe an hour ,then get slower until the remote stops working. He then loosens off the plug on the remote on the lift cover and fluid will start to come out, he tightens it back up and all is fine for maybe even 20 minutes.He does seem to think that the warmer it is the more it occurs.
A pressure check shows that I have about 2400 psi

 

[Roadworthy]

You may wish to determine exactly what type fluid is in there, though it may be simpler to just replace the fluid with new fluid of the recommended type. If the fluid is black it's probably due for a change anyhow.

 

[Midniteoyl]

Sounds like a heat problem.

 

[sam un ont]

That was the plan

 

[sam un ont]

That was my plan but only when I am sure tha the problem is fixed

 

[sam un ont]

I do agree that it appears to be heat related but right now I am at a loss as where to start

 

[sam un ont]

After a pile more reading I am beginning to think the seal in the pump may be the problem,but I will keep checking before I put it together

 

[sam un ont]

Got a lot of it together today ,waiting for some o rings.
thanks for all the advice and I will let you know the outcome
Sam

 

[Midniteoyl]

Sorry, I missed the responses here, but it seem you have it well under control. Let us know how it turns out.