2A8-27-00110 final drive for Komatsu PC500LC-10R PC500 excavator
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Nabtesco GM18VL-K-31/52 22B-60-22110 final drive for Komatsu PC130-8 PC138US-8 PC138USLC-8 excavator
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Component: Complete Final Drive Assembly (Hydraulic Travel Motor with Planetary Gearbox)
Komatsu OEM Part Numbers: 2A8-27-00110, 2A8-27-00120 (2A82700110, 2A82700120)
Machine Compatibility:
Komatsu PC500LC-10R Heavy Mining Excavator
Komatsu PC500-10R Series
Condition: Brand New Original / Premium OEM Specification Equivalent (Complete Drop-In Unit)
System Function: Converts high-pressure hydraulic fluid flow into high torque to drive the track chains on 50-ton class heavy excavators.
2. Technical Specifications
Motor Type: High-Pressure Variable Displacement Axial Piston Travel Motor
Reducer Type: Heavy-Duty Multi-Stage Planetary Gear Reduction Assembly
Performance Parameters: High-torque output and gear reduction ratios engineered specifically to handle heavy tracking, slope climbing, and mining conditions matching Komatsu SAA6D125E/SAA6D140E power output.
Integrated Control Network: Features integrated multi-disc wet dynamic parking brake, automatic high/low two-speed shift valve, counter-balance valves, and crossover relief valves.
Mounting Interface: Heavy-duty sprocket mounting pattern and precision frame flange engineered for direct fit onto Komatsu PC500LC-10R undercarriage frames.
3. Critical Installation Requirements
Travel Motor Housing Priming (Mandatory)
Before operating the excavator or driving the tracks, pre-fill the axial piston travel motor casing with clean, fresh hydraulic fluid 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 line leading back to the main hydraulic tank. Ensure there are no kinks, restrictions, or sharp bends. High backpressure in the case drain line will blow out the main hub shaft seal and contaminate planetary gearbox lubricant with hydraulic oil.
Gearbox Oil Level & Initial Fill
Check that the planetary gear reduction hub is filled to the center level plug with high-pressure 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 Circuit Decontamination
If replacing a unit that suffered catastrophic internal mechanical breakdown, completely drain and flush the main hydraulic reservoir, clean oil cooler lines, and replace all main return and pilot filter elements to remove metallic contaminants.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 2A8-27-00110 and 2A8-27-00120 interchangeable?
A: Yes. These part numbers represent standard Komatsu factory revisions, production updates, and left/right side configuration designations across the PC500LC-10R excavator series. They share identical physical frame mounting dimensions, sprocket bolt patterns, and hydraulic port connections.
Q: My Komatsu PC500LC-10R loses tracking power or tracks unevenly under heavy load. Is the final drive failing?
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 reducer. Replacing the complete final drive restores equal tracking power and speed.
Q: Is this final drive delivered complete with both the gearbox and motor?
A: Yes. The assembly is delivered fully intact as a single complete drop-in unit, including the high-pressure axial piston travel 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 caps, 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.