I need to replace this seal and before I order from Moss I thought I would check to see what else I might need. I assume nothing ?
...and a split pin
...and a torque wrench with suitable sized socket (is it 1. 1/8" or 1. 1/4" AF?)
...Suitable oil to top-up/re-fill after repair
Plus someone with their foot on the brakes to stop it all rotating as you have a go at the big nut. They are often loose (ish) , but should be torqued up as required.
Torque 85 - 100 Foot Lbs - to align split pin hole. (Is that 115 to 135 Nm ?) http://www.convertunits.com/from/ft+lb/to/N+m
If the seal area of the flange is groove