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Hi JM, I don't have a clue as to what is going on with your tractor and it almost sounds totally impossible for it to work the way you say it does. But, let me relate this experience. When I bought my old 686, it was a very tired, rode to death, cattle lot "chore tractor" under a loader, which was used by the hired men on the lot. The rearend forward PTO shaft seal had begun to leak inside the tractor, so one of the boys, not knowing, just put a plug down underneath in the weep hole to stop the external leaking. Evidently, over time, the fellas just kept adding rearend oil because it always seemed to be showing "low". When I got it, it appeared to have a rear main seal leak at the back of the motor. Come to find out, that thing had about 60 or 70 gallons of hytran in it and the main clutch was constantly running in oil that had overflowed and followed that open PTO shaft into the forward flywheel/clutch compartment. It absolutely "felt" backwards (possibly, just as your does) because that main clutch was actually slipping when on the high side. Too much torque to pull itself correctly in direct, but it could handle the load while in T/A because of the gear reduction. I know yours is a large frame tractor and is built differently, but strange things do happen and I hope you get it figured out. Allan
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