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 - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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