Cat 931b rear transmission seal

Hey Guys, I have a 1986 931b serial # 29Y1 3f/3r with a fluid

leak at the rear transmission seal at the drive shaft.

Is it possible to replace this seal in the machine? Seems like

I heard somewhere it was very tight but could be done.

If it can be done is there anything special needed. This is a future

project, just making plans.



Thanks

Cat 931b rear transmission seal