Yes, the Allis mowers did have an overrun clutch built into the power shaft. This was a feature that I really liked about it. Personally I would repair or replace the shaft and purchase an overrun, There is a lot of energy built up in the blades and with an overrun, this will reduce the shock to the tractor's P.T.O. when you throttle down or shut the pto off. It will also help prevent the cutter from tring to "push" the tractor
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