I'm having trouble with the forward gears 2 and 4 only in an 8820 combine. Would you suggest pulling the transmission and attempting a rebuild or just buy a used one a replace it?
Had the same problem many years ago. Pull the cover and look for a split washer laying in the housing. For a quick fix we held the washer back in place and brazed it together with the rest of the transmission parts protected with a welders leather apron. We used it for a few more years with no more problems. Good luck.
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