I would drain the transmission oil and check the suction screen...change the hydraulic filter...fill it back up with oil and check it again. If still nothing check the stroke control valve in the head of the main hydraulic pump(if it has a de-stroking screw..screw it in and back out)
Of course..make sure the pump drive shaft and coupler is intact and actually turning the main pump. The shaft could have worn out the splines and just be turning..and not turning the pump shaft
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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