Caterpillar 180-6112 final drive for Caterpillar 317B 318B L LN excavator
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Component: Complete Final Drive Assembly (Hydraulic Travel Motor with Planetary Gearbox)
Komatsu OEM Part Numbers: 20Y-27-00860, 20Y-27-00870, 20Y-27-00862, 20Y-27-00872, 20Y-27-00861, 20Y-27-00871 (20Y2700860, 20Y2700870, 20Y2700862, 20Y2700872, 20Y2700861, 20Y2700871)
Machine Compatibility:
Komatsu PC210-11 / PC210LC-11
Komatsu PC220-8M0 / PC220LC-8M0 Heavy Excavator
Condition: High-Quality Aftermarket New (Complete Drop-In Assembly)
Function: Converts high-pressure hydraulic fluid flow into mechanical torque to drive track chains on 21 to 24-ton class excavators.
2. Technical Specifications
Motor Type: High-Pressure Variable Displacement Axial Piston Travel Motor
Reducer Type: Multi-Stage Planetary Gear Reduction System
Performance Parameters: High torque and speed ratios calibrated specifically to Komatsu SAA6D107E engine output and main control valve flow profiles for heavy tracking and gradeability.
Integrated Valve Network: Includes automatic two-speed shift control, multi-disc wet dynamic parking brake, counterbalance valves, and crossover relief valves.
Mounting Interface: Precision-machined sprocket bolt circle and frame mounting flange engineered for direct match to Komatsu PC210/PC220 undercarriages.
3. Critical Installation Requirements
Travel Motor Housing Priming (Mandatory)
Before operating the machine or driving the tracks, pre-fill the axial piston travel motor casing with clean, fresh hydraulic oil through the highest case drain port. Running an axial piston motor dry—even for a few track revolutions—will score the swash plate and piston slippers, causing immediate loss of pressure.
Verify Case Drain Line Backpressure
Inspect the low-pressure case drain hose back to the main hydraulic reservoir. Ensure there are no kinks, sharp bends, or restrictions. High backpressure in the travel motor case drain will blow out the main shaft seal and contaminate gearbox lubricant with hydraulic fluid.
Gearbox Lubricant Pre-Fill & Level
Verify that the planetary reduction gear hub is filled to the center level plug with fresh gear oil (typically SAE 80W-90 or SAE 90). Perform an initial gear oil change after the first 50 to 100 operating break-in hours.
Hydraulic System Flushing
If replacing a unit that suffered catastrophic internal mechanical failure, drain and flush the main hydraulic tank, clean oil cooler lines, and replace all main return and pilot filter elements to eliminate metallic debris.
4. Frequently Asked Questions (FAQ)
Q: Are all these Komatsu part numbers (20Y-27-00860, 20Y-27-00870, 20Y-27-00862, etc.) interchangeable?
A: Yes. These part numbers represent Komatsu factory engineering updates, dash revisions, and left/right side production designations across the PC210-11 and PC220-8M0 series. They share identical physical frame mounting dimensions, sprocket bolt patterns, and hose port threads.
Q: My Komatsu PC210-11 tracks slow or pulls to one side under load. Is the final drive at fault?
A: Loss of propel torque or asymmetric tracking speed usually points to worn internal piston groups within the travel motor section or worn planetary gears inside the hub. Replacing the complete final drive restores equal tracking power and speed.
Q: Is this unit supplied complete with both the motor and planetary gearbox?
A: Yes. The assembly comes fully intact as a complete drop-in replacement, including the high-pressure axial piston motor, multi-stage planetary gearbox, and pre-calibrated valve/brake manifold block.
5. Shipping & Logistics
Packaging: Preserved with anti-corrosion storage oil, sealed with heavy-duty port plugs, and bolted securely inside an export-safe wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days, with sea freight options available for heavy freight logistics.