I hope for his sake you are correct on your diagnosis, that being said, I have had several hydros apart, never once did I find that to be the problem. Had stuck shuttle valves, plug fell out on end of shuttle valve causing a lurch problem, several worn lever mechanisms causing drive to stop midway into range and a host of simple to complete trashed units. I would suspect something in the speed ratio cam or orfices or servo cylinders myself and would do a pressure test on the servo circuit but, there are a million things that can and do happen inside these units. For the most part, they are very reliable with good clean fluid and filters changes.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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