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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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