John 750 Grinder Mixer Bigiron Auctions. Mar 07, 2021 John 750 Grinder Mixer, 95 Bushel Capacity, 20 Hammer Type Mill, 540 PTO, Approximately 13'' Unloading Auger, Hydraulic Drive Side Auger Feeder, Hand Add Hopper, 12.5L-16 Tires On 8 Bolt Wheels, Extra Auger, Operating Manual, Note: Operational Condition Of This Item Has Not Been Verified And Is Not Disputable By The Buyer.