I think there is 6 total set screws on there. Once all are out, I believe the pto should slip off the shaft no problem. I know there is alot of information here at Only Cub Cadets on this very matter. You must use the search tool to fine information. Good luck! Pictures help, and we love pictures of what the 123 is looking like lately too!
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IH CUB CADET 1450, 72, 86, 1211, IH #2 CART, IH 56" SNOW BLADE, COLLECTING CUB CADET ENGINES
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