Product Introduction

This high-performance spiral bevel gear is a critical drivetrain component, engineered to handle extreme torque loads while delivering smooth, low-noise power transfer. Its spiral tooth design ensures gradual meshing with the differential ring gear, reducing vibration and wear for long service life.

Structure & Material

• Material: High-strength alloy steel, carburized and quenched to create a hard, wear-resistant tooth surface (up to 60 HRC) and a tough, impact-resistant core.

• Design: A one-piece main drive pinion with multi-tooth spiral bevel geometry, a splined shaft (for connecting to the propeller shaft), and a precision-ground pilot end (for alignment). The spiral tooth angle is optimized for load distribution and noise reduction.

Performance

• Extreme Torque Handling: Designed to withstand the high torque outputs of heavy-duty truck engines and transmissions.

• Low-Noise Operation: Spiral teeth engage gradually, reducing meshing noise and vibration compared to straight-cut gears.

• Uniform Load Distribution: The spiral design ensures even contact across tooth surfaces, minimizing wear and extending component life.

Durability

• Carburized alloy steel resists tooth pitting, spalling, and deformation under continuous heavy loads and shock impacts.

• Precision-machined geometry maintains consistent meshing performance over the component’s lifespan.

Core Function

1. Primary Torque Transfer: Transmits rotational power from the propeller shaft to the rear axle differential.

2. 90° Direction Change: Redirects torque to drive the rear axle wheels via the differential ring gear.

3. Differential Engagement: Enables the differential to split torque between the left and right rear wheels.

Rear Axle Main Gear 3712 810-35199-6598 – Sinotruk Sitrak OEM Replacement

When your Sinotruk Sitrak heavy-duty truck demands reliable torque transmission and smooth deceleration at the rear axle, this OEM-spec main gear delivers exactly that. The Rear Axle Main Gear 3712 810-35199-6598 is precision-engineered to fit Sitrak drive axle assemblies, ensuring consistent power delivery from the driveshaft to the wheel ends — even under the most punishing payloads.

Sourced directly from our factory in China, this gear eliminates middleman markups while maintaining the strict dimensional and metallurgical standards your fleet depends on. Whether you are restocking a warehouse in Africa, the Middle East, or Southeast Asia, Mettlead gets this critical drivetrain component to your door fast and at a price that protects your margins.

Key Features and Benefits of the Rear Axle Main Gear 3712 810-35199-6598

This isn’t just another replacement gear sitting on a shelf. Every unit goes through rigorous quality control before it leaves our facility, so you can install it with confidence and keep your trucks earning revenue.

• Precise OEM Fitment – Manufactured to match the original Sinotruk Sitrak rear axle specifications, which means no costly modifications or adapter kits are needed during installation.
• High-Strength Alloy Steel – Heat-treated gear teeth resist pitting, spalling, and premature wear, extending service intervals significantly.
• Optimized Gear Geometry – The tooth profile is designed to reduce noise, minimize vibration, and distribute load evenly across the contact surface.
• Power Transmission & Torque Multiplication – As the core component of the rear axle reduction assembly, this main gear converts driveshaft speed into the high torque your wheels need to move heavy loads uphill or through rough terrain.
• Factory-Direct Pricing – By purchasing from Mettlead, you bypass distributors and enjoy wholesale-level costs without sacrificing quality.
• White-Label & Custom Packaging Available – If you run your own parts brand, we can pack and label this gear under your identity.

Application Scenario: Where This Main Gear Works

The Rear Axle Main Gear 3712 810-35199-6598 is specifically designed for the Sinotruk Sitrak (汕德卡) series of heavy-duty trucks. Installed inside the rear axle housing, it serves as the primary reduction gear that transfers rotational power from the drive pinion to the differential case. In simple terms, it slows down the high-speed input from the transmission while multiplying torque — giving the wheels the brute force they need to haul 40+ tonnes of cargo.

You will typically need this part when rebuilding a rear axle after bearing failure, tooth damage, or scheduled overhaul at high-mileage intervals. It is also a critical stock item for fleet maintenance workshops and spare parts distributors serving Sitrak truck operators.

Looking for more rear axle components? Browse our full Rear Axle Parts catalog for ring gears, differential assemblies, half-shaft gears, and more.

Technical Specifications

Need the complete Sitrak parts list? Visit our Sinotruk Sitrak Truck Parts Full Category Guide to find every component organized by system.

OEM / ODM Capability

Mettlead isn’t just a parts supplier — we are a manufacturing partner. Here is what that means for your business:

• White-Label Packaging – We print your brand name, logo, and part number on the box so your customers see your identity, not ours.
• Custom Specifications – If you need a non-standard gear ratio or a modified tooth count for a specialized application, our engineering team can work with you on tooling and prototyping.
• Strict Quality Control – Every batch undergoes hardness testing, dimensional inspection, and surface finish verification before shipment.
• Flexible Order Quantities – Whether you need 10 pieces for a trial or 1,000 for a distribution contract, we accommodate both.
• Factory Visits Welcome – We encourage procurement managers to visit our production facility in China to audit processes firsthand.

Explore the full range of Sitrak heavy-duty parts we manufacture and stock at our Sitrak Heavy-Duty Parts Factory Direct brand page.

Frequently Asked Questions

What is the function of the rear axle main gear in a Sitrak truck?

The rear axle main gear (also called the crown wheel or ring gear in some contexts) meshes with the drive pinion to reduce rotational speed and increase torque. Essentially, it converts the high-speed, low-torque output of the transmission into the low-speed, high-torque force that turns the wheels. Without a properly functioning main gear, your truck simply cannot move heavy loads efficiently.

How do I confirm that part number 810-35199-6598 fits my specific Sitrak model?

The most reliable method is to cross-reference the number stamped on your existing gear or check your vehicle’s parts catalog using the VIN. If you are unsure, send us your truck model, year, and axle configuration — our technical team will verify compatibility before you place an order.

What are the signs that a rear axle main gear needs replacement?

Common symptoms include a loud whining or humming noise from the rear axle (especially under load), metal shavings in the axle oil during routine fluid changes, and excessive backlash between the ring and pinion. If left unaddressed, a worn main gear can lead to catastrophic axle failure and unplanned downtime.

Is this gear made from the same material as the original Sinotruk part?

Yes. We use high-strength alloy steel that is carburized and case-hardened to achieve the same surface hardness and core toughness as the OEM component. This ensures equivalent fatigue life and load-bearing capacity under real-world operating conditions.

Can I order a sample before committing to a bulk purchase?

Absolutely. We understand that procurement managers need to inspect quality before signing off on larger orders. We are happy to ship a sample unit so your workshop can verify fitment, finish, and hardness before you scale up.

How should I store this gear before installation?

Keep it in its original packaging in a dry, temperature-stable environment. Apply a thin coat of anti-rust oil to the tooth surfaces if the gear will be stored for more than three months. Avoid stacking heavy items on top of the packaging to prevent any deformation of the protective wrapping.

Ready to Secure Your Supply of Rear Axle Main Gears?

Every day your truck sits idle waiting for parts is a day of lost revenue. Don’t let a worn main gear turn into a week-long headache. Get a competitive quote on the Rear Axle Main Gear 3712 810-35199-6598 for Sinotruk Sitrak today — with fast lead times, factory-direct pricing, and the quality assurance your fleet deserves.

Contact Us Now to request pricing, confirm fitment, or arrange a factory visit. Our team typically responds within 24 hours.