I have a 2040 John Deerre with open center hydraulics. All hydraulics stopped working. I split the tractor and checked the trans pump and it checked out ok.I replaced the front piggyback pump and the steering works fine and I have pressure to the rear lift. I also changed all fluids and filters and cleaned the suction screen. The problem I am having now is when I raise the rear lift the pump starts to bog the engine so I lower it back down and the bogging stops. Also the lift is either all the way up or all the way down. As soon as it starts up it goes all the way up and same thing with down. I am a hobby tractor fixer so I need someone with real experience to point me in the right direction or give me the solution.
greendirt
greendirt