I can help, there was a change at SN 20,000 in the design of the shaft from the engine to top pulley. is your tractor above or below SN 20K? Above 20K and you must remove the entire front PTO to get the shaft off. Not as hard as it sounds. Below 20K and I think you can take the shaft off at the crank and slide shaft forward enough to slip a belt thru. Let us know and I can give more detail. Jeff