Komatsu PC128US-2 PC138 Final Drive Motor 22B-60-11321 22B-60-11320 High Torque

The Travel Motor (Final Drive) Part Nos. 22B-60-11321 and 22B-60-11320 for Komatsu PC128US-2 and PC138US-2 excavators is a compact, high-torque propulsion unit specifically engineered for tight-radius urban excavators in the 12-13 ton machine class. This assembly integrates a high-efficiency axial piston hydraulic motor with a precision multi-stage planetary reduction gearbox, delivering reliable tractive effort and smooth travel performance in confined job sites and urban infrastructure projects. Both part numbers serve as direct OEM replacements, ensuring exact fitment and factory-specified hydraulic performance for the respective US-series models.

The Komatsu PC128US-2 and PC138US-2 ultra-short-radius excavators are purpose-built for space-constrained urban environments. Our travel motor final drive is regionally optimized to meet specific operational demands:

• North America & Europe: Designed for municipal utility work, road maintenance, and building renovation projects in dense urban areas, featuring enhanced cold-weather sealing for year-round reliability and low-noise operation suitable for residential and commercial zones.
• Southeast Asia & Oceania: Equipped with heavy-duty floating seals that resist ingress of abrasive mud, clay, and tropical soils common in drainage, foundation, and urban infrastructure projects in high-humidity environments.
• Middle East & Africa: Reinforced housing and high-temperature seals protect against sand erosion and thermal stress in arid desert conditions, ensuring dependable performance on dusty construction sites.

• Compact Urban-Optimized Design: The integrated motor and gearbox assembly is dimensionally engineered to fit within the narrow undercarriage of US-series excavators without compromising drawbar pull or tractive performance on confined job sites.
• Precision Multi-Stage Reduction: The planetary gear set employs heat-treated alloy steel components manufactured to tight tolerances, ensuring even load distribution across contact surfaces and extended service intervals between overhauls.
• Dual Part Number Compatibility: Engineered to accommodate both 22B-60-11321 and 22B-60-11320 specifications, providing flexibility for fleet maintenance and ensuring correct fitment across PC128US-2 and PC138US-2 models with identical mounting dimensions, pilot bores, and hydraulic port locations.
• Robust Contamination Defense: Dual-cone floating seals combined with heavy-duty dust wipers provide comprehensive protection against moisture, mud, and debris ingress, ensuring reliable operation in wet, dusty, and muddy working environments.

• Hydraulic System Care: Routinely inspect case drain lines for restrictions, kinks, or blockages. A restricted drain line can generate excessive back pressure, potentially causing motor seal failure or rotary group damage. Always maintain clean hydraulic fluid and replace return filters according to the machine's prescribed service schedule.
• Gear Oil Management: Fill the planetary housing with the recommended extreme-pressure gear oil of the correct viscosity grade. Change the oil every 250-500 operating hours under normal conditions, and every 250 hours in severe applications such as demolition, quarry work, or continuous heavy digging. Examine drained oil for metallic particles as an early diagnostic indicator of gear or bearing wear.
• Mounting Bolt Integrity: When reinstalling the final drive, always fit new high-strength bolts. Apply a suitable thread locking compound to the bolt threads prior to torquing to factory specifications, preventing loosening caused by continuous vibration and shock loads during travel and digging operations.
• Pre-Start Priming Procedure: Before initial startup or after motor replacement, fill the motor housing with clean hydraulic oil to purge trapped air pockets. Run the machine at low idle for several minutes, cycling the tracks forward and reverse, to ensure complete lubrication of all planetary components before engaging heavy operational loads.

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
• Exceptional customer service and support
• Large inventory, short delivery times, and long warranty periods
• Professional expertise with accurate part number identification