Komatsu PC220-6 PC228UU-1 PC230-6 Final Drive Assembly 708-8F-00120 | High-Torque Axial Piston Travel Motor | Precision Multi-Stage Planetary Gearbox

The 708-8F-00120 Final Drive Assembly is a heavy-duty track propulsion unit engineered for Komatsu PC220-6, PC228UU-1, and PC230-6 hydraulic excavators in the 22-23 ton machine class. This integrated drivetrain combines a high-displacement axial piston travel motor with a two-stage planetary reduction gearbox, delivering the robust torque output and operational reliability required for medium-duty construction, utility contracting, and general excavation applications.

These excavator platforms operate across diverse global job sites, and our final drives are optimized for region-specific operational conditions:

• North America & Europe: Configured with enhanced bearing preload and upgraded seal packs to withstand the high-cycle demands of utility contracting, road maintenance, and rental fleet operations in urban infrastructure projects
• Southeast Asia & Oceania: Equipped with heavy-duty floating seals and corrosion-resistant output shaft coatings to prevent contamination from abrasive laterite soils, monsoon mud, and coastal saline environments in tropical construction and plantation applications
• Japan & East Asia: Tuned to match the precision hydraulic control systems on PC220-6 and PC228UU-1 machines, providing smooth travel modulation and accurate positioning capability for confined urban worksites and slope work

• High-Torque Planetary Reduction: Optimized dual-stage gear ratio delivers maximum drawbar pull for navigating soft terrain and steep grades while maintaining productive travel speeds for daily production cycles
• Cross-Model Compatibility: Engineered to fit PC220-6, PC228UU-1, and PC230-6 undercarriage configurations, providing a unified replacement solution for mixed fleet maintenance programs across different excavator platforms
• Structural Durability: Induction-hardened sun gears, carburized planetary pinions, and high-strength ductile iron housing resist fatigue and structural stress during repetitive loading in trenching, foundation work, and medium-duty excavation operations
• Direct OEM Fitment: All mounting bolt patterns, hydraulic port locations (SAE O-ring boss and JIC 37° flare), and pilot line orientations match original Komatsu specifications for straightforward replacement without undercarriage modifications

• Hydraulic System Care: Routinely inspect case drain line backpressure; sustained readings above 6 kg/cm² indicate internal motor wear requiring teardown inspection. Replace hydraulic return filters every 250 operating hours and pilot filters every 500 hours to maintain clean oil supply to travel motor circuits
• Gear Oil Management: Drain and replenish planetary gearbox oil every 500 operating hours under normal conditions, or every 250 hours in dusty, high-humidity, or high-temperature environments. Use SAE 80W-90 API GL-5 gear oil; verify floating seal compatibility before switching to synthetic alternatives
• Mounting Bolt Protocol: Always install new OEM-specification mounting bolts with medium-strength thread locker. Tighten in a three-stage cross-pattern sequence at 50%, 75%, and 100% of specified torque to ensure even clamping force and prevent housing distortion
• Pre-Start Priming Procedure: Before initial engine startup following final drive replacement, completely fill the motor housing with clean ISO VG 46 hydraulic oil through the uppermost port. Manually rotate the output shaft in both directions to displace trapped air, then verify oil level before operation to prevent dry-start damage to piston shoes and valve plate surfaces

Guangzhou Tieqi Construction Machinery Co., Ltd. (IRON CAVALRY) is strategically located in Guangzhou's Huangpu District. With nearly 15 years of experience, we specialize in engineering machinery hydraulics and are committed to delivering practical solutions and upholding our responsibilities.

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Our efficient execution and rigorous manufacturing approach ensure our products meet over 95% of original performance specifications. This commitment has built widespread trust in the industry.

We maintain a ready inventory of over 500 assembly types, providing access to more than 6,000 different parts. Hydraulic pump, control valve, travel, and swing assemblies are our core products, with particular expertise in large mining excavator components and hard-to-find items.

For large items, we use sturdy plywood crates secured with metal fasteners. Products are cushioned with bubble wrap and secured with wooden braces, with special attention given to protecting vulnerable parts. External reinforcement includes high-strength PET plastic strapping and waterproof wrapping.

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• One-stop solution provider for all hydraulic component needs
• High-quality products at competitive prices
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• Large inventory, short delivery times, and long warranty periods
• Professional expertise with accurate part number identification