Grain mill stops turning

It is more than likely that there is a stripped drive gear inside the mixer, either the attachment hub gear or the pinion gear has stripped and you hear the gears grinding up the nylon parts of the gear. soon it will stop altogether because the wear will be so great that it will no longer engage at all. You need to open the mixer and replace the gears that are worn.

Will it grind any wheat? I had a similar problem with the wheat overwelming the drive system and had to use smaller amounts of wheat to keep the system grinding. Do you have the feeder attached? I couldn't just load it up but had to feed a little at a time. Hope it helps. Favorable comments are apprieciated.