Case 85xt drive issues

[Captain2100]

My 85xt started having an issue with the right side not pulling when it warms up to operating temperature. Everything works fine until I turn the engine off. When I start it back up the right side doesn't want to drive until I rev the engine up and then it jerks and takes off. It will work fine all day until I shut it off and crank it back up. I have read several posts with people having the same issue but none have said what they did to fix the issue. Any help is greatly appreciated.

 

[Gearclash]

Sounds like a servo problem.

 

[Captain2100]

Are you referring to something in the pump or drive motor.

 

[Gearclash]

The control sticks tell the servos how far to move the swash plate of the hydro pumps. The swash plate on those higher horsepower machines has too much force on it for direct manual control. If your machine is 2 speed, there is most likely something similar to a servo that canes the swash plate angle on the drive motor. But the drive motor swash plate should never be a zero displacement position like the pump swash plate will be in neutral.