Hydraulic Pressure builds up

[Jason (IL)]

My Cub has a hydraulic pressure issue, The pump will build up pressure and cause the tractor to come under a load and then stall. Basically I have gathered there is something not allowing pressure to release in the touch control, a check valve or safety valve is stuck? I have taken the unit apart and cleaned it, reassembled it and still have the problem.

Any tips, before I disassemble it all again and double check. The Touch control works, moves the hitch up and down. When I move the lever the tractor runs perfect, When the lever is held constant is when the pressure builds up. If that makes sense?

Thanks

[Jim Becker]

Did you have this problem before you took the unit apart or only after? Does it load up with the lever in the middle or only at one/both ends?

If only at the ends, the stops for the lever need adjusting. If also in the middle, the pressure control valve isn't unloading.

[Jason (IL)]

Problem started during a parade, it happens at all positions.

[Jim Becker]

Sounds like the pressure regulator valve isn't functioning. This is usually because of trash in the orifice and/or screen. You can get at them by removing a pipe plug in the Touch-Control head. Unscrew the plug then unscrew the orifice to clean it. Usually a plugged orifice causes the lift to not move at all, but it can do this as well.

[John *.?-!.* cub owner]

You don't by chance have a bypass block for an auxiliary valve that has had plugs put in it rather than a by pass hose do you? It would be a block mounted between the hydraulic line block and the touch control unit.

[Jason (IL)]

John, There is no by-pass block. I will get to work on the tractor this weekend I hope.