The two things I would look at would at would be a sticking high pressure relief valve or the snap ring off the end of the shuttle valve.
If you can get the tractor to move in reverse by putting it in neutral or forward and then going to to reverse the most likely cause is the shuttle valve.
The way to test it is to put isolation valves on the high pressure lines coming out of the center section. If the problem is still there, it is the shuttle valve spool snap ring or spring. If the problem can not be duplicated then the problem is a sticking reverse high pressure valve.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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