From the description you provide, I suspect the woodruff key that couples the pto shaft to an internal gear that drives the belt pulley shaft is sheared. Looks like the pto housing will have to be removed in order to replace that key.
Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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good hydraulic unit for JD 50/520/530
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