You can replace the PTO seal using the method described by MMDEL.
If you need to remove the PTO shaft for some other reason, I use a 18 - 36 inch pipe wrench on the shaft near the front of the rearend case, pull on it enough to make the teeth bite into the shaft then pry with a bar between the wrench and the front of the case. Clean the burs off some before trying to remove the shaft.
It also helps to spray some penetrant on the housing and bearing races at the back of the shaft (what usually makes the shaft hard to move is the bearing races in the housing bore)
*** Before attempting removal of the long shaft by any means, make sure you have removed the setscrew and the key from the hub/shaft. ***
MM PTO brake bands, R,Z Waterpump baffles & Oil filter adapters.
Still enjoy using several MM Tractors and some equipment