Dave maybe just make a stop so you can't raise the three point control lever any higher. I have one made for when I use my rotary cutter. If you raise it too high it bends the PTO shaft. I just took a small carriage bolt the would fit into the slot the lever slides in. I then put a larger washer and a wing nut on the bolt. I just pop it in the slot and slide it down against the lever. So I just raise the mower up until the PTO is close. Then slide the bolt down against the lever and tighten the wing nut. So I have a down stop for setting the cutting height and an up stop to keep the PTO safe. I use it with my three point mounted hay tedder too. It will break the PTO yoke if raised too high.
On some of my other tractors you don't have an exposed slot. I just cut a small piece of wood and then wire tie it to make a positive up stop. Use it with the round bale mover on any of the cab tractors. If you raise the bale too high it will hit the back window.
Maybe you can make some thing like that to put on when you are using the PTO on a drawn implement.
Some of the old MFs had an adjustable top stop. I know my Uncle's MF 165 did. I think you where supposed to use it to let the lever back into a constant pump position for using external valves but it worked to keep the three point limited as well.
I also have seen guys just take a small pair of Vise grips and clamp the lever so it does not move at all when they want to hold a constant position.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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