Komatsu D375A-5 Crawler Dozer Final Drive Assembly 195-27-00770 195-27-00720

The 195-27-00770 and 195-27-00720 Final Drive Assemblies are heavy-duty planetary gear reduction units engineered specifically for the Komatsu D375A-5 crawler dozer, operating in the 70-80 ton machine class. These assemblies integrate a high-displacement axial piston hydraulic motor with a robust four-stage planetary gear train enclosed in a thick-wall ductile iron housing, delivering superior sprocket torque and structural durability for demanding dozing, ripping, and push-loading operations in heavy construction and mining environments.

Komatsu D375A-5 dozers are deployed in demanding global environments, and our final drives are specifically optimized for regional conditions:

• North American Quarry & Overburden Operations: Features deep-case hardened planetary gears and reinforced bearing races to withstand continuous high-impact loading from rock fragmentation and heavy material displacement
• Australian Iron Ore & Coal Mines: Incorporates upgraded dual-cone floating seals with tungsten carbide sealing faces to resist abrasive dust ingress and thermal cycling during extended shift cycles
• Indonesian & Malaysian Tropical Earthworks: Equipped with corrosion-resistant housing treatments and modified breather valve assemblies to prevent moisture condensation and oil emulsification in high-humidity climates

• Enhanced Gear Train Durability: Precision-ground helical planetary gears with optimized tooth profiles distribute torque loads evenly across multiple contact points, minimizing noise, vibration, and localized stress concentrations under peak loads
• Direct OEM Replacement Fitment: All mounting bolt patterns, alignment dowel positions, pilot register diameters, and hydraulic port thread configurations match original Komatsu specifications for immediate bolt-on installation without modifications
• Superior Structural Rigidity: Heavy-wall ductile iron housing with integrated reinforcing webs resists housing deflection and maintains gear alignment integrity under severe side-load conditions encountered during angled dozing and benching operations
• Advanced Thermal Management: Internal oil galleries and external housing fins promote efficient heat dissipation, maintaining stable oil temperatures and consistent lubrication viscosity during prolonged high-load cycles

• Case Drain Line Verification: Confirm the motor case drain line is routed independently to the hydraulic tank with minimal back pressure. Elevated case pressure will accelerate rotary seal wear and potentially cause catastrophic leakage. Perform quarterly oil sampling to monitor wear particle concentration trends.
• Gear Oil Change Protocol: Replace planetary gear oil every 250 hours for initial break-in, followed by 500-hour intervals thereafter. Use extreme pressure gear oil meeting Komatsu specification AE 80W-90. Inspect oil for water contamination, copper content, and ferrous debris accumulation.
• Sprocket Hub Bolt Replacement Procedure: Always install new hub mounting bolts with original equipment grade thread locking compound. Clean bolt threads and blind holes thoroughly with solvent and compressed air. Torque in three stages using a cross pattern to a final specification of 1,250 ± 50 N*m.
• Motor Priming for Initial Startup: Before first operation after installation or extended storage, fill the motor housing completely with filtered hydraulic oil through the top port until oil flows steadily from the case drain opening. Slowly rotate the drive unit by hand or at low engine RPM for several minutes to purge air pockets, preventing cavitation damage and ensuring immediate bearing and piston lubrication at startup.

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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