Good afternoon all. Putting a call out to all Super Major experts. I've got a real stumper. Regardless of what I do 3PT will only go up slowly under no load, regardless of control position. It can be pushed down by hand while this is happening and will just slowly go back up. I have 1700 psi of pressure, have extensively read many posts here and have:
Change oil to aw32, checked and cleaned check valve, removed and polished gently unloading valve, no o ring in place, also cleaned and polished control shuttle, cleaned polished and rebuilt valve chest, replaced exhaust filter, made sure all shuttle valves move freely with gravity.
I am stumped, have rebuilt many tractors and have never had one be quite so stubborn, but I refuse to give up. Have been fooling with this one for just over a year.
I can provide more details but don't want to make this to long to read.