Doug, the early tractors drove the PTO off the same shaft that drove the powershift. When it was shifted or clutched, the surge caused a whipping action in the pto which would shear pins. Later tractors had a seperate flywheel driven shaft for the PTO, that fixed the problem. All white tractors had the cure and some of the very latest sunset ones. There are listed ser. no. breaks if someone really needs to know. Rod.
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