This is great information, papapitufo! Thank you! I have a question and an observation.
How do you remove the secondary shaft (where the drive sprocket attaches) to get to the point shown in the first photo? I see two inaccessible snap rings, and that's all.
I believe there is an error in the second bearing part number. MT280232043 appears to be a Torrington bearing for the “clutch pump piston” (OSSA equivalent 173002RA). I think we actually want to also replace two MT280432039 (30x33x10) bearings while everything is apart. These are the bearings on which the clutch basket turns.