I have done that job on the 10’s.
It’s not too bad with two people and a good cordless rattle gun. Overhead crane or excavator for the auger tube
Forklift and pallet beside the turret above front wheels to stand on
you shouldnt have to do that bush until you get to 3-3500 sep hrs minimum, that’s when my pivot tube failed. Bush was half worn
the 30-40’s are bigger and beefier so do you really want to go in there?
fold your auger out then useing a high lift fork or similar and an old car tyre for a cushion, lift the end of the auger tube gently and see if there’s any slop in your pivot bush. Needs to be done folded out as that’s where all the weight and wear is on the plastic bush