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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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