195-27-00634 195-27-00644 Final Drive & Travel Motor Assembly for Komatsu D375A-5 | Heavy-Duty Mining Dozer Gearbox

The Final Drive and Travel Motor Assembly (195-27-00634 & 195-27-00644) is the high-torque mechanical heart of the Komatsu D375A-5 crawler dozer. Engineered for the 100-ton class mining bulldozer, this multi-stage planetary gearbox is designed to withstand the extreme pushing forces, vertical vibrations, and structural stress found in large-scale overburden removal, ripping, and quarrying operations.

Restoring Maximum Drawbar Pull The Komatsu D375A-5 is a legendary workhorse in the mining world, and its productivity relies entirely on the final drive’s ability to multiply torque. The 195-27-00634 is not just a gearbox; it is the final link that translates hydraulic and mechanical power into ground-shredding tractive effort.

In a bulldozer of this size, the final drive operates under constant "shock load" conditions—especially during heavy ripping operations. Our premium aftermarket units are built to handle the immense pressure of shifting heavy overburden. By utilizing precision-ground sun gears and reinforced planet carriers, this assembly eliminates "gear whine" and minimizes internal heat buildup, which are the primary precursors to catastrophic failure in large dozers.

• The D375A-5 is a global mining staple, and our drive assemblies are optimized for the following environments:

  • Australia & Oceania (Pilbara / Hunter Valley): Engineered with reinforced "Mining-Grade" floating seals to keep out the abrasive red dust and iron ore particles that are notorious for destroying standard seals.

  • CIS Regions (Russia, Kazakhstan): Features "Arctic-Ready" metallurgy to maintain structural ductility and prevent housing cracks during high-torque cold starts in Siberian coal mines.

  • Africa & Middle East: Optimized for long-shift operations in high-ambient temperatures, ensuring the travel motor maintains volumetric efficiency even when the hydraulic oil is at peak operating heat.

  • South America (Chile, Peru): Ideal for high-altitude copper mines where consistent power transmission and reliable braking systems are critical for safety and production.

For a 100-ton bulldozer, the cost of a final drive failure is astronomical. Maintenance is your only insurance:

• The "Metal Fuzz" Check: Regularly inspect the magnetic drain plug. Fine metallic fuzz is expected, but distinct silver flakes are a "stop work" order. It means a bearing or gear tooth is spalling.

• Floating Seal Vigilance: Bulldozers push dirt into the final drive area. If you see oil weeping onto the inside of the track frame, replace the seal immediately. Once abrasive dirt enters the gears, the gearbox is on a countdown to failure.

• Oil Level Discipline: Dozers often work on steep inclines. Ensure your gear oil is always at the correct level; a few liters low can lead to the upper planetary gears running dry during a long uphill push.

• Sprocket Bolt Torque: Always use new Grade 10.9 or 12.9 bolts when mounting the sprocket. Follow the Komatsu multi-stage torque specs to prevent bolt stretch and catastrophic flange damage.

Guangzhou Tieqi Construction Machinery Co., Ltd. (IRON CAVALRY) is strategically located in Guangzhou's Huangpu District, approximately an hour from Baiyun International Airport. We have been a dedicated specialist in engineering machinery hydraulics for nearly 15 years.

Driven by our core values of "Pragmatism and Progress," we are committed to delivering practical solutions and upholding our responsibilities. This principle-driven approach defines all our operations and client partnerships.

In China's excavator hydraulic assembly sector, our efficient execution and rigorous approach to manufacturing every product to meet over 95% of original performance specifications have built widespread trust. This has made us a destination for industry peers and clients seeking knowledge and reliable supply.

Our capability is backed by 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 a distinct advantage in large mining excavator components and hard-to-find items.

Our 4,000-square-meter factory in Guangzhou is equipped for professional manufacturing, precision assembly, rigorous testing, and quality certification, ensuring reliable performance and timely delivery for every order.

For large items, we use sturdy plywood crates secured with metal fasteners for added stability. Inside, the products are cushioned with bubble wrap and secured with wooden braces, while special attention is given to protecting vulnerable parts. Externally, the crates are reinforced with high-strength PET plastic strapping and wrapped in highly waterproof black film.

• One-stop solution provider for all your hydraulic component needs
• High-quality products at competitive prices
• Exceptional customer service that makes you feel at home
• Large inventory, short delivery times, and long warranty periods
• Professional expertise with accurate part number identification for excavator components