Posted by Owen Aaland on July 14, 2011 at 13:56:52 from (216.47.33.237):
In Reply to: 656 Hydro question posted by Dean on July 12, 2011 at 07:15:05:
Quoting Removed, click Modern View to see
The Decelerator relief valve is working. That is what caused the tractor to slow when you pulled the lever back to neutral.
The most likely cause of your problem is the snap ring is off the end of the shuttle valve. The shuttle valve is what the directs the charge pressure to the unloaded side of the hydro circuit to provide make up oil to keep the circuit full. The valve is spring loaded to the center position and moves to supply the oil to the intake side of the hydrostatic pump. When going down hill or decelerating the motor and the pump swap functions. If the shuttle valve does not shift then the hydro circuit will not stay full of oil.
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