Komatsu E31EX-21 D31P-18 DX31P-20 Final Drive Assembly 11Y-27-30401 | High-Torque Travel Motor | Precision Planetary Gearbox | Heavy-Duty Dozer Traction Component

These Komatsu dozers operate across diverse global job sites. Our final drive is purpose-optimized to meet regional environmental challenges:

• North America & Europe: Built for utility grading and land clearing in cold climates, featuring enhanced low-temperature sealing to maintain hydraulic efficiency during winter operations.
• Southeast Asia & Oceania: Equipped with reinforced floating seals that resist ingress of abrasive mud, clay, and tropical soils common in plantation and infrastructure projects.
• Middle East & Africa: Durable housing and high-temperature seals protect against sand erosion and thermal stress in arid desert environments.

• High-Torque Travel Motor: The axial piston hydraulic motor delivers strong starting torque and smooth speed control, enabling efficient climbing, turning, and load pushing on uneven terrain.
• Precision Planetary Gearbox: A multi-stage planetary reduction set is machined to tight tolerances, ensuring even load distribution across hardened gears for reduced wear and extended service intervals.
• Direct OEM Replacement Fit: All mounting bolt patterns, pilot diameters, and hydraulic port locations are manufactured to match original Komatsu specifications, enabling a straightforward swap with minimal downtime.
• Heavy-Duty Dozer Traction Component: The cast iron housing features reinforced ribbing to resist structural stress, while dual-cone seals protect internal components from moisture and debris contamination.

• Hydraulic System Care: Routinely inspect case drain lines for restrictions or kinks; a blocked drain can generate back pressure that damages the motor rotating group. Always use clean hydraulic fluid and replace return filters according to the machine's service schedule.
• Gear Oil Management: Fill the planetary housing with the specified viscosity gear oil. Change the oil every 250-500 operating hours under normal conditions, and every 250 hours in severe applications. Examine drained oil for metallic debris as an early indicator of internal wear.
• Mounting Bolt Protocol: Always install new high-strength bolts during reassembly. Apply a premium thread locking compound to the bolt threads prior to torquing to factory specifications, preventing loosening caused by vibration and shock loads.
• Pre-Start Priming Procedure: Before initial startup or after motor replacement, fill the motor case with clean hydraulic oil to purge trapped air. Run the machine at low idle for several minutes, cycling the tracks forward and reverse, to ensure complete lubrication of all planetary components.

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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