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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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