Komatsu PC50UU-1 PC50UU-2 20U-60-12200 final drive for 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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1. Product Overview
The final drive for the Komatsu PC50UU series is a precision-engineered integrated unit consisting of a two-speed variable displacement axial piston motor and a multi-stage planetary reduction gearbox. Given the heavy lifting and tight-radius maneuvering typical of the PC50UU, these units are built to provide maximum tractive effort and smooth deceleration. Our drives are manufactured to meet or exceed OEM specifications for the PC50UU-1 and PC50UU-2 platforms, ensuring the machine tracks straight and maintains full power on inclines.
2. Comprehensive OEM Part Number Compatibility
This assembly is a direct "bolt-on" replacement for the following Komatsu factory part numbers and manufacturer codes:
Komatsu Part Numbers:
20U-60-12200 / 20U6012200
20U-60-12100 / 20U6012100
20U-60-23320 / 20U6023320
20U-60-23330 / 20U6023330
20U-60-23310 / 20U6023310
20U-60-23331 / 20U6023331
Manufacturer/Teijin Seiki/Nabtesco Codes:
TZ512B1000-01 / TZ535B1000-00 / TZ587B1000-00
TZ531B1000-00 / TZ514B200000JA / TZ538B200001EU
TZ578B00000EY / TZ531B20000JA
3. Technical Specifications
Motor Type: Variable displacement axial piston motor with integrated 2-speed (High/Low) travel function.
Gearbox Architecture: Multi-stage planetary reduction using induction-hardened alloy gears for superior fatigue resistance.
Sealing: Heavy-duty "Duo-Cone" (Mirror) mechanical floating seals designed to prevent oil leaks and block the ingress of mud, water, and grit.
Braking System: Integrated spring-applied, hydraulic-release wet disc parking brake for safe holding on steep grades.
Hydraulic Pressure: Rated for continuous high-pressure operation (up to 280 bar) to maintain original factory breakout and tracking force.
4. Why Partner With a 13-Year Industry Expert?
UU-Series Expertise: We understand the specific mounting dimensions and hydraulic porting unique to Komatsu's Ultra-Urban series, ensuring a perfect 100% "plug-and-play" fitment.
Performance Validation: Every final drive undergoes a rigorous 100% bench test. We verify volumetric efficiency, brake holding torque, and smooth 2-speed shifting before the unit is crated.
Factory-Direct Value: Access Original New or Premium OEM-spec units at competitive wholesale prices, bypassing the high markups of local dealerships.
Global Rapid Logistics: Units are secured in reinforced, shock-proof export packaging. Delivery via DHL, FedEx, or UPS typically arrives in 3 to 7 business days.
5. Critical Installation & Maintenance Protocol
Gear Oil Commissioning: Final drives are shipped without gear oil for safety. You must fill the planetary gearbox with the correct volume of SAE 80W-90 gear oil before operation.
Case Drain Integrity: Ensure the case drain line is clear and connected to the correct port. High backpressure in the motor case is the leading cause of shaft seal failure and internal motor damage.
System Flushing: If the previous motor failed due to internal breakage, you must flush the hydraulic tank and lines. Residual metal shavings are the primary cause of premature failure in replacement motors.
Air Bleeding: After installation, lift the track off the ground and run the motor at low speed in both directions for several minutes to purge air from the hydraulic circuit.
6. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number and the number of sprocket mounting holes.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options, and current stock status.
Technical Guidance: Our expert team is available 24/7 to provide professional advice on installation, pressure settings, and troubleshooting.