What model grinder/mixer?

I'm pretty sure Arts-Way has parts books on their website but maybe not for all models. 


The bearings on the unload auger shafts are generic bearings that can be sourced anywhere.   Depending on how bad your bearings are, you may need new bevel gears as well.

As far as I know, Arts-Way is the only source for the worm gear.   If the worm gear is junk, you likely need to replace all of the bearings that go along with it.   I don't know if all models are the same but on a 500A there were at least 2 bearings on both sides of the worm gear, with one on each side being a thrust bearing.      If it hasn't been worn out all over, by taking out some bolts you can give the ring gear a partial turn to get the worm gear on new teeth.