The AMERICAN "AC" Series machines are heavy, rugged, dust-tight units built from heavy, plate-steel weldments and rolled plates as well as structural shapes. These machines are machined to a dust-tight fit at all abutting surfaces. The major areas of wear have replaceable abrasion-resistant liners. Incorporated in the upper rear section of each machine is a metal trap for catching and holding uncrushable materials. Hinged doors are provided to allow clean-out of the metal from the tramp iron pocket. The crusher design allows for the removal of the rotor and cage assemblies without disturbing the feed chute or other equipment above the crushers. The bearing pedestals are machined for proper mounting of the bearing pillow blocks. The cage assembly is fabricated from a combination of mild steel and abrasion-resistant steel where areas of greater wear are concerned. The machine is lined throughout with replaceable abrasion-resistant liners.

The rotor assembly is statically balanced and checked for dynamic balance at our plant prior to shipment. The main rotor shaft is of a forged steel 4140 alloy, which is heat-treated for maximum strength. The crushing rings are forged steel or manganese steel castings supported on heavy, heat-treated alloy steel bars which run the entire width of the granulator cage. The bearings are heavy-duty, self-aligning spherical roller bearings with labyrinth and shroud seals. The housings are of a split design for easy inspection and service. The bearings have a minimum design life well in excess of 60,000 hours B-10 life rating.