CAT D6D D6H D6R D6T Final Drive Group 260 6650 | Heavy Dozer Planetary Reducer 260 6650 3W 6493 7G 5532

The Final Drive Group Assembly (P/N 260 6650) is the high-torque power delivery system engineered exclusively for Caterpillar’s D6 track-type tractor fleet. Optimized for the 18 to 22-ton crawler class, including the D6D, D6H, D6R, D6R II, D6R III, D6R XL, D6T, and D6T XL, this planetary reducer handles demanding mechanical push and grading forces. Built for CAT's signature elevated sprocket (high-drive) configuration, it isolates severe torsional delivery from ground-induced shock loads during aggressive earthmoving, site preparation, and infrastructure applications.

Restoring Drawbar Efficiency for Severe Earthmoving The Caterpillar D6 series is arguably the most versatile and widely deployed track-type tractor in the heavy equipment industry, trusted globally for everything from heavy slot dozing to finish grading. Utilizing Caterpillar's distinct elevated sprocket design, the steering clutches, brakes, and final drives are efficiently isolated from abrasive mud packing, roller frame flex, and direct ground impacts. Despite this defensive architecture, the internal planetary gears of the 260 6650 drive group manage intense continuous loading while multiplying engine horsepower into massive tractive effort.

Over thousands of operating hours, the continuous shuttle dozing—alternating under heavy loads from forward to reverse—places high shearing forces on the sun shafts, needle bearings, and planet pinions. Our premium aftermarket replacement final drive gearboxes are engineered to address common structural wear items like subsurface gear pitting and bearing race spalling. Manufactured using precision gear-shaving profiles and advanced induction hardening, this unit guarantees crisp response, optimal power distribution, and zero tracking drift across unpredictable subgrades.

• North America & Europe: Ideal for Civil Infrastructure, Commercial Site Prep, and Rental Fleets where machines face relentless duty cycles and strict performance criteria.

• Southeast Asia & Oceania: Configured with heavy-duty mechanical floating seals that prevent fine silica sand, volcanic soil, and tropical mud from penetrating the gear oil cavity during harsh wet-season pioneering.

• CIS Regions & Middle East: Engineered with housing metallurgy that accommodates sharp thermal variations—preventing brittle cracking during freezing cold starts or seal degradation under intense desert ambient heat.

The High-Viscosity Lubrication Rule: Track-type tractor mechanical drives operate under much tighter tooth-to-tooth micro-welding forces than excavator systems. Always use specialized premium CAT FDAO (Final Drive and Axle Oil) or its equivalent high-performance drivetrain lubricant. Never mix general hydraulic fluid or standard automotive gear oils into the 260 6650 housing.

• S.O.S. Scheduled Oil Sampling: Pull final drive oil samples every 250 operating hours. Monitor parts-per-million (PPM) thresholds for iron, copper, and chromium. A sudden rise in copper indicates thrust washer wear, which requires immediate attention before causing devastating gear misalignment.

• Magnetic Drain Plug Inspections: Clean and analyze the magnetic plug at every oil drain interval. While fine microscopic gray soot is acceptable, any distinct metallic flakes or small chunking mean gear spalling has initiated—shut down the dozer immediately to prevent the expensive planet carrier from being destroyed.

• Sprocket Hardware Lifecycle: The high torque generated by the D6 demands flawless segment fastener integrity. Never reuse old segment bolts because they experience structural stretching under load. Always install new Grade 12.9 hardware, torque strictly to factory specifications, and execute the final torque-turn sequence to avoid stripping the drive hub threads.

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