Presumably you are not trying to lift anything heavier that 750-800 pounds.
Are you seeing anything suspicious through the RH access hole when you try to raise a load on the three point?
Do you have full travel on the control valve(~ 1 inch fore and aft total movement)?
If there are no oil leaks in the supply to the lift cylinder or at the pump housing (leaking side plate gaskets/seals) and the control valve is moving through it"s full range, then I would expect a problem internally in the pump. Check valves?
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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