There is an adjustment procedure in the service manual. Basically, put the rear end on jack stands, start the tractor, put it in neutral via the brake pedal. The tires will probably rotate one way or the other. Carefully loosen a couple bolts on the front left side of the hydro and tap the cam pivot bracket up or down a bit to make the rear wheels stop moving. Tighten the bolts, try the forward/reverse control several times, stepping on the brake. Readjust as needed to get true neutral when you put the brake pedal down.
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