Komatsu original part number-6212-22-4140

Core Functions

 Power Transmission and Constant Ratio Drive: As a timing/drive gear, it precisely transmits power from the crankshaft to components like the camshaft and fuel pump, maintaining a constant transmission ratio. This ensures accurate timing for valve operation and fuel injection, preventing misalignment between valve timing and fuel supply. Heavy-Duty Performance: Designed for the SA6D140 engine (15.2L displacement, 264–364kW/354–495hp), it withstands high torque and impact loads, making it ideal for continuous high-load operations in heavy equipment such as mining dump trucks and large bulldozers. System Synergy and Durability: Integrated with the engine's lubrication and cooling systems, it reduces transmission losses, minimizes vibration and noise, and extends the service life of both the unit and its components.

Core Advantage

High-strength fatigue resistance: Manufactured with premium alloys and precision heat treatment, featuring root bending strength ≥1000MPa. Capable of withstanding instantaneous overloads (1.5–2 times rated load), effectively reducing the risk of tooth fracture and tooth surface adhesion.

Highly efficient transmission: Featuring involute tooth profiles and precision grinding technology, it achieves 95%-98% transmission efficiency. This ensures precise timing, minimizes power loss, and enables the engine to deliver low fuel consumption (minimum fuel consumption rate: 189g/(kW·h)) and low noise performance.

High compatibility and reliability: Factory dimensions and tolerances are precisely matched, eliminating the need for additional adjustments during installation. The sealing and lubrication systems are well-adapted, providing dust and mud resistance while withstanding harsh conditions such as high temperatures, dust, and vibrations, thereby reducing maintenance frequency.

Universal Compatibility: As Komatsu's standard components, these parts can directly replace older parts of the same model, compatible with all SA6D140 engine series and related equipment, ensuring stable after-sales service and spare parts supply.

Fit scenarios and value

Compatible equipment: Heavy-duty machinery equipped with SA6D140/SAA6D140 engines, including Komatsu HD325-6 mining dump trucks and D155AX-6 bulldozers.

Core value: Ensures stable engine operation under heavy loads, frequent start-stop cycles, and sustained high-speed conditions, reducing downtime caused by gear failures while improving equipment availability and operational efficiency.