Case 2590

[Keckr]

Hydraulics work fine at first. But the tractor loses hydraulics to the implement after running a couple hours. When I press in the the clutch the hydraulics work again but then quit when I release. Just curious if this is a charge pump issue.
Thanks

 

[mEl]

Im betting you have powershift leakage issues, the flow divider shifts to supply the hydraulics once the power shift is satisfied, If the power shift starts leaking, the flow divider shifts back to satisfy the leak taking flow from the hydraulics, the only way to really be sure is to have a flow test done on the hydraulic system while working the power shift through it ranges and recording the flow on the flow meter in each range, clutch down and reverse. Using the flow test will also check pump output and the oil should be warmed up and that can be accomplished with the flowmeter.

 

[urbancase]

sounds like some of the same problem i having with my 3594, i not sure if i will attempt to work on it or take to case.

 

[chcase]

I would agree with what was stated by mEL
Below. The poweshift trasmissions in the 70 and 90 series need to have someone with a good hydraulic flow meter run a full test on your system and record the pressures.Once that is done there are a few members here that can tell you what the problem is.The factory Case service manual will help. (Not the cheap it manual)

 

[jogl]

Its good to be able to do a flow test, but just doing the pressure test is simpler and will tell you which clutch is leaking, if it is a leaking clutch, which from your description it likely is.