I need to replace the PTO oil seal on a Kubota L3000. I have not done this before and notice that there is a coupler at the end of the PTO shaft. Will the coupler come off when the PTO shaft is removed and if it does, how difficult is it to get to it and reinstall? I am also going to try parking the tractor facing down on a hill hoping that I won't have to drain the transmission fluid. Any suggestions on this procedure? Thank you for your help.