sawdust
Guest
Had the same thing happen to an R50 last year. Mine broke right behind the inner wheel bearing where the spindle was cut down to the proper size for the bearing. The local dealer had it in stock because he has seen it happen a few times before. The local machine shop said it broke because the way it was made was to cut the spindle straight down to size and this gives it a line to break on. The taper needs to be cut in a radius where it is cut down from the larger shaft size so there isn't a definite score line for it to break on.