Sounds like you are on the right track.
The parts diagrams don’t give much detail for your tractor but for the 200 series it shows a bearing at the bottom of the steering column and a snap ring (circlip by the book) that looks to retain the shaft to the bearing. The bearing is captured between the column housing and the mounting bracket.
To get to the snap ring it looks like you can take out the 4 bolts that hold the housing and the gearbox to the bracket then slide the column up through the hood far enough to get to the snap ring.
When you get it apart please post pictures so we can all see how it works.
Good luck!