Could you describe how the tractor's "PTO's go out"? The problem could be in the pump instead of in the several tractors that went bad running that pump. It's hard to tell without knowing the pump or seeing a picture of the setup. Some possibilities to look into are:
Binding in the pump or the pump's drive.
PTO joints that are out of phase to each other, creating a vibration and knock every half revolution.
Worn or badly misaligned PTO shaft.
If there is a belt pulley mounted directly on the tractor's PTO shaft without any other support bearings, it could be putting too much side load on the tractor's PTO shaft. PTO shafts are designed for torque loads only, not for heavy side loads like the old belt pulleys were.
Too much restriction/back pressure on the pump's outlet, causing the pump to use more power than it should.
Have you tried changing pumps?
If the pump manufacturer is still in business, check if they have a website, or call them and describe the problems you are having. It may be a common problem with that pumps.
Again, it's hard to do more than speculate without knowing the setup, please post a picture of the pump drive.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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