? for Mike10 on 499 Haybine

The 540 splines on the gearbox for the PTO pump are getting very worn, it will survive this year but will be replaced before next. I’m assuming the planetary setup is pretty self explanatory but just wanted to make sure there isn’t something else in need to do when I replace the shaft. Pump sits properly on the tractor and all, doesn’t wobble or anything, I’m just figuring this is just a wear and tear thing as this machine has cut thousands of acres.

? for Mike10 on 499 Haybine