Product Overview This hydraulic travel motor assembly — also referred to as a final drive — is the core walking drive component for excavators and is compatible with the E320GC model. It delivers driving torque for machine travel and integrates a hydraulic motor with a reduction gearbox. Precision machining, stable output torque, and reliable sealing make it well suited for equipment overhaul and replacement. 507-6557 507-6558 Interchange part numbers: 507-6557, 507-6558.