creia wrote:.In addition, the PTO end is 2.25" long and has a slotted keyway the entire length.
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Actually, you don't need to worry so much about length, long as they are at least as long, and have the keyway you mention - Longer shafts can be cut down to size (ordinary hacksaw will do the job, wrap a strip of printer paper around the shaft keeping straight edge squared up for the full wrap, serves as an excellent guide to cut square. - If really long and needing drilled & tapped , make sure the drilled depth (and tapped threads) go in far enough first before cutting, otherwise, you should drill deeper using original hole as your drill guide, then make sure you have 3-4 threads already tapped in past the point you need to cut, so you can finish tapping threads after cut off.
Granted, those starter clutch crankshafts can be very hard to find these days, but if you can find something within the specs you need, the PTO end can usually be machined relatively easily (with patience and care) with ordinary shop tools - Can even machine in a keyway if need be, if you have a good dremel and quality cuttter bits (and a steady enough hand to cut within the lines)
But yeah, on the off chance you CAN locate a crankshaft with the gear you need (and assuming it won't work as a replacement at all), I'd start by making sure you can remove THAT gear first. Because, as noted, you may have to heat the gear to remove, and even then it may not come loose as heating it will also heat the crank.... installing it would be done by putting crank in freezer for a few hours, then heat the gear in hot oil (20-30 minutes at a steady temperature WELL BELOW the oil's flash point) pull crank out of freezer, drop gear on and (working as fast as possible) get it aligned and snugged tight before the gear cools too much and clinches to the shaft... - So, as RoyM says, generally not serviceable.. but if you can find a crank, don't limit your options to only an exact match.
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)