Jeff, if you have a shop manual, it describes a hydraulic pressure test for the PTO clutch pack.
One more test for worn splines on pressure plate, engage the PTO and if the tractor has remote hydraulic outlets, dead head the remote outlet and listen for relief valve buzzing, engine being lugged down and watch to see if PTO stops. If the relief valve stops buzzing and the PTO stops, the splines on the pressure plate that drive the PTO shaft could be worn out but still have enough grip to drive the hydraulic pump but not a PTO driven implement.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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