Simplicity Sunstar Transmission Output Shaft

I have a Simplicity Sunstar Tractor Model # 1692135 that powers a rear 3200 RPM PTO kit. I finally found the difficulty in activating the blower. (It worked for two lawns and then wouldnt engage) The output (male) splined shaft is worn out, and the female coupling on the kit required to power the blower that has the electric clutch etc is worn out as well. I have part numbers for both of these parts, and I have to find out if I can still get them etc. I can easily replace the female coupling, but the male splined shaft is part of the hydrostat. Will the hydro have to be removed from the tractor completely to reinstall the new part, if I can get one, or is there a faster way to do this?