Nabtesco GM09 Travel motor 21W-60-22130 final drive for Komatsu PC75UU-2 PC75UU-2E PC75UD-2 excavator
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1. Product Overview
The Nabtesco GM09 series is an integrated hydraulic transmission comprising a high-efficiency variable displacement axial piston motor and a multi-stage planetary reduction gearbox. As the original equipment (OEM) for the Komatsu PC75UU-2, this unit is engineered to provide the high tractive effort needed for a 7.5-ton machine while operating within the confined footprint of urban jobsites. With 13 years of specialized experience in Komatsu hydraulics, we provide units calibrated to restore factory-spec synchronized tracking and climbing power.
2. Comprehensive OEM Part Number Compatibility
This assembly is a 100% direct "bolt-on" replacement for the following Komatsu factory part numbers and Nabtesco manufacturer codes:
Komatsu Part Numbers:
21W-60-22130 / 21W6022130
21W-60-22410 / 21W6022410
21W-60-22411 / 21W6022411
Manufacturer Codes (Nabtesco / Teijin Seiki):
TZ922A1000-00 / TZ912B1000-00 / TZ912B1000-01
TZ920A200000XA / TZ921B200000HD / TZ922B200001HT
Machine Fitment:
Komatsu PC75UU-2
Komatsu PC75UU-2E
Komatsu PC75UD-2
3. Technical Specifications & Performance
Motor Type: 2-speed axial piston motor with integrated high/low speed switching.
Gearbox Architecture: Precision planetary reduction with induction-hardened gears for maximum shock-load resistance.
Max Working Pressure: Rated up to 28.5 MPa (285 bar) to match original factory climbing and breakout force specifications.
Sealing: Heavy-duty Duo-Cone (Mirror) mechanical floating seals protect the internal gears from mud, standing water, and abrasive grit.
Braking: Integrated spring-applied, hydraulic-release wet disc parking brake for secure operation on steep grades.
4. Why Partner With a 13-Year Industry Expert?
Nabtesco OEM Authenticity: We provide original-spec GM09 units. This ensures the internal valve plates and piston sets match the original Komatsu hydraulic curve, preventing the tracking "drift" common with low-quality aftermarket drives.
100% Performance Validation: Every unit undergoes a rigorous bench test. We verify volumetric efficiency, brake holding torque, and smooth 2-speed shifting before the unit is crated for shipment.
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 crates. Express 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 SAE 80W-90 gear oil (approx. 1.5–2.0 liters) before operation.
Case Drain Connection: Verify that the case drain line is clear and connected to the correct port. Excessive backpressure in the motor case is the leading cause of shaft seal failure.
System Decontamination: If the previous motor failed due to internal breakage, you must flush the hydraulic tank and lines. Residual metal shavings will destroy a new motor almost immediately.
Air Purging: After installation, lift the track and run the motor at low speed in both directions for several minutes to purge air from the hydraulic circuit before applying full load.
6. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your Machine Serial Number and the number of sprocket mounting holes (commonly 9 or 12).
Instant Quote: Contact us today for up-to-date pricing, availability, and tiered quality options.
Technical Guidance: Our expert team is available 24/7 to assist with installation procedures, hydraulic pressure settings, and troubleshooting.