To look for a blockage, start pulling lines loose and hold the end so it will pump in a bucket while someone fires up the tractor. Won't be much pressure but time with your watch how long it takes to pump a gallon to compare to what your pump puts out. Use a gallon jug to mark the gallons on your bucket. Don't get run over doing this.
Put in a pressure guage to check your pressures.
If you have good down pressure on your hitch but no up pressure, then probably not the pump. Pull the return line and see what pumps out when you make your hitch go down and then what happens when it goes up.
I'd look for a sticky piston or crud/blockage in valve or stuck relief/popoff valve with something under the ball. Something in one part of the system will affect another. It helps to have a book and diagram of the hydaulics and at least an IH manual so you can trace things out. There is a logic to the system and redundent relief/popoff valves and check valves in everything. Something is likely blocked with crud.
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