When it comes to the performance of Komatsu HD785 dump trucks, one of the most critical yet often overlooked components is the pinion gear. As a key part of the drivetrain system, the Pinion Gear HD785 ensures the efficient transmission of engine power to the wheels—especially crucial for hauling heavy loads in mining and construction operations.
MASSCoT, a trusted name in heavy equipment components, offers premium-quality HD785 pinion gears designed to meet and exceed OEM standards. In this article, we’ll explore the functionality, advantages, and key part numbers: 561-22-71207, 561-22-71206, and 561-22-71205.
What Is a Pinion Gear in Komatsu HD785?
A pinion gear is a smaller gear that meshes with a ring gear in a differential or final drive assembly. In the Komatsu HD785, this component plays a pivotal role in power transmission from the transmission unit to the axle and wheel hubs. It works under high torque and extreme conditions—making material quality, precision machining, and durability essential.
MASSCoT Pinion Gear Part Numbers
MASSCoT manufactures the following high-performance pinion gears specifically engineered for the Komatsu HD785 series:
ID Part Numbers:
561-22-71207
561-22-71206
561-22-71205
- Precision-machined for smooth meshing and high-load endurance. Ideal for replacing worn-out or damaged final drive pinions in HD785 units.
- Designed for compatibility with HD785-7 models. Built to handle continuous operation under extreme mining conditions.
- Functions as a supporting pinion gear within the gear train, often paired with ring gears and differential assemblies for rotational stability.
All MASSCoT pinion gears are made from hardened alloy steel, treated with advanced heat processes for maximum durability and resistance to fatigue or wear.
Key Features of MASSCoT Pinion Gear HD785
OEM-Compatible Fitment
100% interchangeable with original Komatsu parts. Guaranteed fit and function with part numbers 561-22-71207, 561-22-71206, and 561-22-71205.
High Torque Resistance
MASSCoT gears are built to endure the intense torque produced during heavy haul operations, reducing the risk of premature failure.
Longer Lifespan
Thanks to precision grinding and finishing, MASSCoT pinion gears offer low friction performance—extending service intervals and overall gear life.
Cost-Effective Alternative
While maintaining premium quality, MASSCoT provides more budget-friendly options compared to OEM brands—ideal for fleet owners and resellers.
Applications & Use Case
MASSCoT HD785 pinion gears are ideal for:
- Heavy-duty mining trucks
- Quarry operations
- Earthmoving contractors
- Equipment rebuild and overhaul workshops
- Rental fleets operating Komatsu HD785
Whether you’re looking for a single replacement or bulk supply, MASSCoT provides reliable inventory, fast shipping, and consistent product quality.
Why Choose MASSCoT for HD785 Pinion Gears?
Good Manufacturing Process
Every gear is produced under strict quality control standards to ensure safety and performance under real-world working conditions.
Tested for Compatibility
Rigorously bench-tested for fit, noise reduction, and thermal expansion to match or outperform original Komatsu pinion gear specs.
Technical Support Available
Our engineering team supports customer inquiries, fitment guidance, and even custom orders for large-scale maintenance projects.
Maintenance Tips for Longer Gear Life
1. Lubricate Regularly: Use manufacturer-recommended gear oil and change it as scheduled.
2. Monitor Wear: Check for abnormal noise, vibration, or looseness during inspections.
3. Align Properly: Ensure correct alignment during installation to prevent premature gear wear.
Looking to Order MASSCoT Pinion Gears for HD785?
PT Sarthak Inti Persada is an official the owner and manufacturer of MASSCoT heavy-duty components, including pinion gear sets for Komatsu HD785. All parts are ready stock or available for preorder with competitive pricing and technical after-sales support.
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