rwirtzfeld
Active member
- Joined
- Sep 21, 2009
- Messages
- 26
I have a question about the final drive sprocket nut and retaining washer. I bought a dead M500 and during my repower project, I noticed one of the rear inner wheel bearing hubs was cracked in two places. So, I opened up the chain case on that side, to find the sprocket nut had backed out to the inside hub, cracking the inner hub and bearing race. So, that brings me to the retaining washer, how is it suppose to keep the drive sprocket nut tight? If you bend it over(the retaining washer) onto the nut, what keeps them both from backing away from the sprocket together, other than the torque initially when installed (450 ftlbs, book says)? My thought was to bend one side of the washer over the nut, then bend the other side of the washer over the flat spot on the sprocket, that would truely lock it, but the service manual specifically says just to bend it over the nut? Of course this method would not work on the front drive sprocket, because they use smaller diameter washers, that do not hang over enough to bend it towards both pieces.