In Reply to: Re: Still Need Help! 2N Hydraulics posted by Jack - Iowa on October 01, 2018 at 10:12:37:
How old is the fluid? The easy answer is if it looks bad it is bad, or if it has been several years since a refresh... Just about anything can happen with old fluid. Obviously dirt, less obvious is corrosion from moisture that forms in there when the tractor sits. Moisture goes right to the bottom of the sump and is the first thing sucked into the pump when things start flowing again.
With the PTO engaged and the pump turning, you should see something going on in there, when the touch control is moved to the top. Turbulence or leakage from the top cover will indicate where the problem is.
If touch control is moving by itself, the friction disc may need to be tightened or rebuilt as TOH already mentioned. Even if the lever won't stay put, the lift should still go to the upper transport position when the touch control is raised to the top of it's travel. If it ain't the valves, linkage or pump problems are next. That usually requires pulling the top cover and dropping the pump to find problems. At that point, you have to go by the directions in the FO-4.