I had the same problem six months ago with my Manco. I even put the thing in a 10 ton press to get it off the jackshaft and it never budged. Soaked it for a week with penetrating oil and tried again. Still stuck. There was no set screws or other hardware holding it on the shaft. Ended up buying a new jackshaft, driven clutch, and sprocket. Hope you have better luck.
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