14*14 holes PC78 hydraulic final drive Komatsu travel motor assembly gearbox for Komatsu excavators

This high-precision heavy-duty driving device assembly (integrating high-pressure travel motor and planetary gearbox) adopts a highly distinctive 14 hole x 14 hole (14 * 14 Holes) double-sided flange physical structure (14 holes on the frame end and 14 holes on the drive wheel end). This final drive assembly is specially designed for Komatsu's small and medium-sized core hydraulic excavators, perfectly matching the 7 to 8-ton core flagship models such as PC78, PC78US, and PC78MR series. The product is based on first principles to optimize high-power density transmission and bolt load distribution, ensuring absolute certainty of steering and propulsion torque for small tonnage equipment in complex muddy conditions. The physical dimensions of the product packaging are approximately 390mm × 340mm × 350mm, with an overall net weight of approximately 48kg. The original factory standard hole positions are precisely aligned.

"Extreme cleaning and flange torque alignment: Before installation, the frame and drive wheel mounting surfaces must be thoroughly cleaned. 14 * 14 high-strength bolts must be coated with anti seize compound and tightened in stages and symmetrically using a torque wrench strictly according to the original factory standard torque, to prevent bolt shear fracture or slight deformation of the shell caused by uneven local stress.

Motor forced oil filling (core avoidance pit): When connecting hydraulic pipelines, they must be absolutely aligned and do not connect the wrong drain pipe (Case Drain). Before starting the engine, clean hydraulic oil must be filled from the air release/oil injection port on the top of the walking motor housing. Dry grinding is strictly prohibited for starting, otherwise the rotating components will be physically eroded within 3 seconds of ignition.

Low speed no-load exhaust transition: Use a working device to suspend the single-sided track support, control the motor to run alternately in forward and reverse directions at low speed for 10-15 minutes, thoroughly exhaust the air inside the circuit, and closely monitor the gear meshing sound. Only after confirming the thermodynamic state is stable can the working load be applied on the ground."