If it's the same as a 1660 I think it has a wedge key inthe pulley that is hard to get out. The bearing has a lock collar on it I believe. Both are hard to get off as they are probably froze to the shaft. Had to take a torch to get mine off
I always try to knock the pulley in, then get the key out. When you knock the pulley in, it loosen's the key.Sometimes you are really shy of room, but it works most of the time. After that is done, sand, file, soak with penetrant, heat, whatever it takes.
It doesn't have a gib key, the parts book only shows the pulley and the shaft (cast pulley), no setscrew, no key. The other end has what appears to be a 3" long sleeve pressed on (no set screw) to hold the bearing on but none of the left end is even in the parts book that I have found. Need help! Local dealer never had one apart. TORQUE