JD 2020 troubles

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JD 2020 troubles

Nathan Jacquin	After an hour(maybe 2) or so of use, all hydraulic functions slow, start to chatter and barely function....and now the clutch just started slipping, but only when it acts up. Both filters and fluid have been replaced twice and the fluid appears clean and the level constant(before and during extended use). The pressure at remote hookup remains constant at 1650psi, even while it acts rough. Even though the service manual specs 2250psi. Clutch and pto eventually grab, with just less than full throttle. I have been hesitant to adjust the stroke control valve until I feel there isn't another problem(i.e. clog or faulty pump.) All suggestions are welcome. Here is the part that really confuses me......If I shut it down and let it sit for a while it is fine for another hour or so...depending on load conditions. Which makes me think clog, but where and how would it clear itself by sitting. I also worry about using a cheaper quality fluid...just because the first filter and fluid change is about when this all started.
John Heine	Did you clean suction screen in bottom of transmission?
Nathan Jacquin	The belly filter is just as clean if not even more shiny. Has been this way for a couple years since I last replaced filters and fluid.
Nathan Jacquin	The photo of the screen filter is just after removing it, didn't do anything except let some oil drip off.
Nathan Jacquin	Well, no luck so far, I checked the intake screen filter, the pressure control valve, and the stroke control valve along with its filter. All these components are really clean and don"t show any visual signs of wear. Although the stroke control valve was shiny where it contacts the seat. Also, I attempted to remove one main pump outlet valve. Unfortunately with the loader in the way my socket plus universal joint couldn't grab securely. I had to leave without sufficient time to spend breaking it loose. Next, I added new fluid and ran through all the cycles for a half hour or so, it was all jumpy or barely functional at first with 2100psi standby. With slow improvements and occasional times when it worked perfectly smooth and normal, I thought I was getting somewhere. Then things started getting worse. I shut it down and re-checked the fluid, below the add mark...so I added more. Now suddenly there is really fluctuating standby pressure, anywhere from 100-2100psi. I tried to disconnect the loader and that didn"t seem to affect it at all. I am worried the valves in the pump are sticking, but not excited about taking the pump off to check all of them just yet, unless someone more wise suggests that I remove the main pump. Another thing that troubles me is that each time I replace the fluid it seems to get worse. Any suggestions?

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