The CAT E320D Travel Motor / Final Drive Assembly is the core chassis drive component for the classic CAT 320D medium excavator. It integrates a piston hydraulic motor with a 2-stage planetary gear reducer and a wet parking brake, and supports automatic two-speed travel. Technical Specifications Applicable Machines 320D, 320DL, 321D, 320C, 323D, 324D, 325D, 329D, 330B, 319D Excavators Structure Piston hydraulic motor, planetary gear set, wet multi-disc brake, 2-speed shift