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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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