Product Overview The CAT E336GC final drive assembly, also known as the travel motor assembly, integrates a hydraulic travel motor and a planetary reduction gearbox into a single unit. It is the core chassis hydraulic component that delivers travel power to the CAT E336GC large excavator. This assembly is compatible with the E336GC, E340GC, E345GC, and E336D2 excavator models, and is identified by part numbers 511-0315, 568-9405, 574-3203, and 591-8316. Technical Specificatio