Had mine apart to lube the bearings but don’t remember much other than it was simple. Kuhlmann recommends Kluber grease. I have a copy of the manual but it leaves much to be desired. I’ll look to see if the manual says anything about bearing replacement.
Older SU2s have two piece castings, newer a one.
Mike, owner of Plate Engraving in Medina Ohio is the U.S. Kuhlman rep and can help you with parts etc.