Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: Grinding noise
Older MODEL 20 axels didn't have a key. They had serrations, like very fine splines, in the hub. When the nut tightened down it pressed the hub onto the smooth taper of the axel shaft with enough force that the serrations were pressed into the shaft. That plus the jamming together of the tapers was enough to keep things from spinning. Mostly.
The hub won't fall off, because the washer, nut and cotter pin are still there. But if the spinning hub galls to the washer, which galls to the nut, it could shear the cotter pin and wind the nut off, and bye bye wheel.