Quote:
Originally Posted by sawdustdad
Does the shaft through the hydro turn when the engine is running? There is a shaft that comes out the back of the hydro? It will turn with the input shaft. Check that.
A broken spirol pin is not obvious as it remains in the hole and may still be sheared off on the shaft inside the coupling.
Lack of fluid in the rear end, plugged filter, charge pump on backwards, pinched o-ring on the charge pump cover, broken swash plate/trunnion arm, no connection between speed lever on dash and the hydro cam plate.
1. Verify output on rear of hydro is turning, if not, you've got a spirol pin sheared
2. Change fluid and filter. Clean out rear end in the process. 7 qts Hytran or other similar hydraulic fluid. Roll the tractor by hand to prime the pump if the filter has been recently changed.
3. Remove the tunnel cover and observe the speed control lever, it should move the cam plate beside the hydro which in turn should move the trunnion arm fore and aft.
4. Possible both relief valves are shot. Usually I find one--so it moves one way but not the other. But both is possible. Make sure the buttons on top of the valves are not stuck down. (assuming they are manual valves)
5. Has anyone recently worked on the charge pump?
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I will have to check everything you suggested. I will double check pin in driveshaft. It was hard to tell while running if it was turning the pump but I think it was. Tractor appears to have never really been touched as far as being worked on.