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Could be some binding in the linkage. I'd check this first. Easy way is to remove the pin from the crank arm of the transmision and see if the linkage binds or if it's in the trany. Could also be damage to the swach plate in the pump. Bad news. Try to detaermine whitch it is before proceeding.

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After the above check (and it works fine). Then check the quandrant. The plate the lever rides against. The Vickers hydro units had a very fussy clearance between the quadrant and the lever with the locking ball. loosen (do not remove) the bolts holding the quandrant to the cowling of the tractor. Work the lever back and forth and find the position that works best.

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