I had a very similar problem. Tractor would move forward normally, but reverse you sat there for a while before it finally would move.
Figuring I had lost a clutch seal, split the tractor. One seal was bad. Replaced all the seals and new fluid. Tractor would reverse a little quicker, but would not carry a load. Replaced the transmission controller, no change. When the wires were swapped on the solenoid and the tractor would reverse fine but die immediately and would not start until they were switched back. Just about to order new solenoids and transducers when I saw this post. Took out the pressure regulator valve and cleaned it well and the tractor worked better. Ordered a new one and now it is back to normal. 2002 JD 4310 Epower reverser.
