Does the tractor have Hi-Lo? Does it work properly? What about the PTO?
If there was a problem with either of those I'd say the problem is related to the charge pump or a leak in that system... but given that it seems intermittent, I'd guess that it's in the stroke control on the main pump.
At this point in time I think you either need someone well versed in the workings of that hydraulic system to have a look at it or else start investing in DEERE service manuals if you're going to DIY.... You're only going to get so much understanding of it reading comments on here... and you really need to understand it fully if you're going to fix it.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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