There is a snap ring on the input shaft that has to come out. Its behind the seal
I'm a freaking idiot, I just now saw the "271" I read 241 my apologies
Sent from phone
There are several snap rings throughout the case that will have to be removed during disassembly (not just 2).
Also, while the pictures above are useful, they are not of a 271. The seal has to be removed from the front case half - it cannot be unbolted as shown above, so I would suggest getting a new seal onhand before you start. It is not difficult, just take your time.
I have pictures of a 271 when I tore mine down, so if you want to see something specific, let me know.