Since you're asking my opinion......


First thing I'd do is tip the motor forward again and get that shaft out of there.

Second thing is to take the shaft completely apart. Clean and wire wheel all parts. Replace parts if they are worn. Paint all parts, I use Rust-Oleum High Heat 2000 paint, no primer. Pre heat parts with a heat gun or blow dryer, spray two coats. This particlar paint has no thickness build up and is long lasting and it does keep parts like the shaft from rusting.
Wire wheel the pins and use anti-sieze when reinstalling.

I will slide couplers and rags onto the shaft lose, insert the shaft into the bushing on the motor coupling adaptor, bring other end to the pump coupler and insert, now losely bolt the rags to the pump and motor coupler. Slide both shaft couplers to the rags and losely bolt those together, now install pins, tighten and adjust all rag bolts.

Parts should look like this when installed. These pins have no anti-sieze on them at the time of the pic as this was only for fitting and I intended to remove and reinstall again.



Note the paint finish, no build up to inhibit couplers.



Don't forget your fan.

I see no reason not to restore all parts prior to reinstalling them. Most of us will be working on our tractors again and again, might as well make it easy for the next go round.

Scott