My 1957 Parts book for the 77/Super77 includes the optional hand clutch. It indicates this option will work on all 77/Super 77 serial numbers. The special parts for the hand clutch are identified with a "K" prefix indicating they were initially designed for the 88 tractors. I can"t comment on whether the same hardware would apply to the 66 tractors. I would expect that most if not all would be common to all three tractor series. Does anyone know if the optional hand clutch replaced the foot clutch or that both clutchs remained functional when installed. I don"t remember ever seeing a hand clutch installed. My family was an OLiver dealer in Iowa 46-52 and I worked the summer of 52 in the engineering department at Charles City.
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