Abstract: The present invention provides an impact crushing apparatus that includes a housing, a chamber defined within the housing, a rotor assembly for receiving material and throwing the material radially outward, and a plurality of anvils positioned around the rotor assembly and configured to break apart the material. The rotor assembly is driven by a drive unit, which is coupled to a shaft. A bearing cartridge encircles the shaft, and the bearing cartridge and drive unit are disposed outside the chamber.