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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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