I am working on a newer Ariens machine. The machine would not roll at all. I went thru the whole drive system and I think I may have found the problem. Is the steel disc that the rubber roller wheel rides on supposed to move back and forth? It looks like that bolt and roller is meant to slide inside the assembly. It took the disc off the housing and it seems to be ok but that inner sleeve does not move. I would take the bearings out to check it , but I am not sure how to remove them.