Final Drive Gearbox 92480040 90603140 Excavator Spare Parts For Komatsu PC4000-6

PC4000-6 is a large mining face shovel excavator. The travel drive assembly (Final Drive) consists of a high-pressure travel hydraulic motor integrated with a multi-stage planetary gear reducer. It is mounted at the end of the track frame to drive the sprocket and track.

Adopting heavy-duty multi-stage planetary reduction structure, it amplifies motor output torque to handle heavy load climbing and harsh mining conditions. The assembly has built-in parking brake for automatic locking when stopped to prevent sliding.

Common part numbers: 92480040, 90603140. Some part numbers of PC4000-6 final drive are interchangeable with PC3000-6, but mounting flange and output torque are different. Always verify stamped part number before order.

• Abnormal travel noise: Pitting or broken teeth on planetary gear and sun gear; worn bearing and damaged cage; contaminated or insufficient gear oil.
• Weak one-side travel & track deviation: Worn pistons and slippers of travel motor causing internal leakage; stuck parking brake that cannot fully release; insufficient relief valve pressure.
• Overheating of travel reducer: Worn gear pairs and increased friction loss; overfilled / underfilled or deteriorated gear oil; heat generated by motor internal leakage.
• Oil leakage at housing seal: Aged and damaged output shaft oil seal and joint face gasket; blocked breather, high internal pressure blows out seals.
• Stuck travel, unable to rotate: Locked planetary gear or broken gear teeth; stuck brake piston, brake cannot be released.

• Verify the stamped part number on old assembly and model PC4000-6 before placing order. PC4000-6 final drive cannot be directly interchanged with PC4000-11 or PC3000-6. Left and right travel assemblies share same part number.
• New assembly or remanufactured assembly are available. For remanufactured final drive, request factory load test report and confirm warranty period.
• Replace full oil seal and gasket kit during installation. Fill with dedicated reducer gear oil and clean hydraulic circuit to prevent premature wear of new assembly.
• Inspection upon arrival: Check housing for dents and cracks, intact oil ports and flange surface, all oil ports well sealed. Perform no-load and load test before installation to inspect noise, temperature and brake performance.
• Storage requirement: Store horizontally in dry and shaded area, seal all oil ports against dust and moisture.