Boy, can't say on a mf 35, but I don't believe you want to pull the pto shaft. On a allis chalmers, the seal retainer is almost triangle shaped with like 3 bolts that take like a half inch wrench. The seal is round donut shaped about 2-2 1/2 inches and pressed in to the seal retainer. Knock the seal out. When you put the new seal in the seal retainer, you have to be real careful you don't "jimmy or burger" up the seal. I DO NOT recommend hammering on it. I have found that taking (2) 1x4 or (2) 2x4 boards work really well. Put the seal and seal retainer sandwiched between the board. Put the seal, seal retainer and boards all in a bench vise. The boards serve as a buffer between the vise jaws and the seal/seal retainer
The board will absorb any marring caused by the vise jaws. Make sure every thing is all lined up. if seal does not line up straight and tries go in crooked, you're going to get in to trouble. Slowly tighten the bench vise making sure the seal slowly pushes/is pressed into the seal retainer. The re-install the seal retainer with the new seal back onto the tractor. If you got pics, send them. I'll try to help if I can.
