Komatsu D375A-5 D375A-6 Final Drive Motor Gearbox Crawler Dozer Hydraulic Traction Assembly High-Torque Travel Drive

The Final Drive Motor Gearbox for Komatsu D375A-5 and D375A-6 dozers is an ultra-heavy-duty propulsion assembly engineered for large-scale mining, land reclamation, and heavy earthmoving applications in the 70-80 ton machine class. This unit integrates a high-displacement axial piston hydraulic motor with a rugged multi-stage planetary reduction gearbox, delivering immense tractive effort and reliable travel performance under continuous high-load conditions.

The Komatsu D375A-5 and D375A-6 dozers are deployed across the world's most demanding heavy industries. Our final drive motor gearbox is regionally optimized to meet specific operational challenges:

• North America & South America: Engineered for large-scale open-pit mining, coal overburden removal, and heavy infrastructure projects, with reinforced housing and enhanced sealing to withstand extreme temperature variations, abrasive materials, and continuous high-cycle operation.
• Australia & Oceania: Equipped with heavy-duty floating seals that resist ingress of highly abrasive quartz-rich soils, red dust, and laterite materials common in iron ore and coal mining environments.
• Africa & Middle East: High-temperature seals and corrosion-resistant materials protect against sand erosion, thermal stress, and airborne particulate contamination in arid desert and semi-arid mining regions.

• Ultra-High Torque Capacity: The large-displacement axial piston motor delivers exceptional starting torque and smooth power transmission, enabling the D375A to push heavy loads on steep mine ramps, soft overburden, and uneven bench floors.
• Heavy-Duty Multi-Stage Planetary Reduction: The gearbox employs case-hardened alloy steel planetary gears with precision-ground tooth profiles, ensuring uniform load distribution across multiple stages and maximizing service life between major rebuilds.
• Cross-Generation Compatibility: Engineered to fit both D375A-5 and D375A-6 models with identical mounting dimensions, pilot bores, spline connections, and hydraulic port locations, providing flexibility for fleet maintenance across machine generations.
• Mining-Grade Structural Integrity: The ductile iron housing features massive reinforced ribbing and stress-relieved construction to resist structural fatigue under continuous shock loading from dozing and ripping operations. Dual-cone floating seals with heavy-duty dust wipers provide robust protection against contamination in the harshest environments.

1. Hydraulic System Care: Routinely inspect case drain lines for restrictions, kinks, or blockages. A restricted drain line can generate excessive back pressure, leading to catastrophic motor rotary group failure. Maintain strict hydraulic fluid cleanliness standards and replace return filters at intervals prescribed for heavy mining equipment.
2. Gear Oil Management: Fill the planetary housing with the recommended extreme-pressure gear oil of the correct viscosity grade for heavy-duty dozer applications. Change the oil every 250-500 operating hours under normal conditions, and every 250 hours in severe applications such as continuous ripping, push-loading, or heavy dozing.
3. Mounting Bolt Protocol: When reinstalling the final drive motor gearbox, always fit new high-strength bolts meeting the specified grade. Apply a suitable thread locking compound to the bolt threads prior to torquing to factory specifications.
4. Pre-Operation Priming Procedure: Before initial startup or after final drive 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.

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
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