Removed, disassembled the hydrostat. Nothing wrong with it. Replaced the gasket, reassembled, reinstalled with a new cork gasket and refilled fluid.
Was careful to match mark the charge pump housing, kept the valve plates in exact same arrangement, the swash plate pivots correctly, all the slippers look fine, (did not actually remove the piston blocks as everything looked good), reinstalled the charge pump gear pin, and did not pinch the charge pump o ring. (not the first time I've been into a hydrostat).
Reinstalled and still not working. Next step is replace the filter which I removed and simply reinstalled. I have a spare.
I'm driving the hydrostat with a drill to test it. The front axle works fine, the rear does not.
Next step is to pull the rear cover and see if something in there is busted. From the hydro opening in the front of the axle housing, the large gear the hydro motor pinion drives seems to be connected to the wheels, as expected. So next thought is plugged filter, as unlikely as that seems because it was new last year.
Other ideas?
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