Product Introduction

• Structure: Precision-forged from high-strength 20CrMnTi alloy steel, with an external involute gear tooth profile and a smooth inner bore. The gear is carburized, quenched, and ground to achieve a surface hardness of HRC 58–62and a core hardness of HRC 33–45, balancing wear resistance and toughness.

• Key Specifications:

• Number of teeth: 21 teeth

• Material: 20CrMnTi carburized steel

• Surface treatment: Carburizing + quenching + gear grinding

• Operating temperature: -40°C to +150°C

  • Performance: The hardened tooth surface resists pitting and wear under high torque loads, while the tough core withstands shock loads during reverse engagement. Precision-ground teeth ensure smooth meshing and minimal noise.

Core Function

1. Power Redirection: Transmits torque between the main shaft reverse gear and countershaft reverse gear, changing the direction of rotation to enable vehicle reverse travel.

2. Torque Transmission: Handles high reverse gear torque loads without deformation or failure.

3. Noise Reduction: Precision-ground tooth profile ensures smooth, quiet meshing with mating gears.

Idler Gear WG2210050001 – SINOTRUK HW Series Gearbox Replacement Part

Premium Idler Gear WG2210050001 for SINOTRUK HW Series Gearbox – Built for Durability and Precision

When your fleet depends on SINOTRUK heavy-duty trucks, every single gearbox component matters. The Idler Gear WG2210050001 is a critical transmission part engineered specifically for the SINOTRUK HW Series Gearbox. It ensures smooth power transfer between gear sets, reduces vibration, and maintains the precise timing your drivetrain demands. Whether you are restocking your warehouse or fulfilling urgent client orders, this idler gear delivers the OEM-equivalent performance your customers expect — at a factory-direct price that protects your margins.

At Mettlead, we supply this idler gear straight from quality-certified production lines in China. That means you get consistent product quality, competitive bulk pricing, and the reliability that keeps your business moving forward. As a result, hundreds of distributors across Africa, the Middle East, Southeast Asia, and South America already trust us as their go-to source for SINOTRUK HOWO truck parts and gearbox components.

Key Features and Benefits of the Idler Gear WG2210050001

Precision-Engineered for the HW Gearbox

This idler gear is manufactured to exact OEM dimensional tolerances. Consequently, it meshes flawlessly with the primary and secondary drive gears inside the SINOTRUK HW Series transmission, ensuring seamless torque distribution and quiet operation under heavy loads.

Superior Material Composition

Crafted from high-grade alloy steel, the WG2210050001 idler gear undergoes carburizing and quenching heat treatment. This process creates a hardened tooth surface while maintaining a tough, shock-resistant core — extending service life significantly compared to inferior aftermarket alternatives.

Strict Quality Control at Every Stage

Each batch of Idler Gear WG2210050001 passes through rigorous inspection protocols, including dimensional verification, hardness testing, and gear tooth profile analysis. In other words, what arrives at your warehouse is ready to install — no sorting, no rejects, no wasted time.

Wholesale-Friendly Profit Margins

Because Mettlead operates as a factory-direct supplier, we eliminate multiple middlemen from the supply chain. Therefore, you access volume pricing that gives your business a genuine competitive advantage in your local market.

White-Label and Custom Packaging Available

Looking to build your own brand? We offer white-label packaging and custom branding solutions. You can put your company name and logo on every box, reinforcing brand recognition with every sale you make.

Technical Specifications

Application Scenario – Where the WG2210050001 Idler Gear Fits

The Idler Gear WG2210050001 sits inside the SINOTRUK HW Series manual transmission, where it serves as an intermediate gear connecting the input and output shafts. Its primary role is to transfer rotational force while maintaining the correct rotational direction between gear pairs. Without a properly functioning idler gear, drivers experience grinding noises, difficulty shifting, and eventually complete gearbox failure.

Compatible vehicle models include:

• SINOTRUK HOWO A7 heavy-duty trucks equipped with HW19710 / HW19712 gearbox
• SINOTRUK HOWO T7H tractor units with HW Series transmission
• SINOTRUK HOWO T5G medium and heavy trucks
• SINOTRUK SITRAK C7H long-haul tractors
• Other SINOTRUK models fitted with the HW Series gearbox

In short, if your customers operate SINOTRUK heavy trucks with HW-series transmissions, this idler gear is an essential stocking item. It is one of the most commonly replaced SINOTRUK HOWO gearbox parts due to normal wear over high-mileage duty cycles.

OEM/ODM Capability

Mettlead understands that every market is different. That is why we offer flexible OEM and ODM solutions tailored to your business needs:

• OEM Supply: We produce the Idler Gear WG2210050001 to original equipment specifications, ensuring drop-in compatibility with SINOTRUK HW gearboxes.
• White-Label Packaging: Receive products in your own branded packaging — complete with your logo, part number labels, and custom box design.
• Custom Kitting: We can bundle the WG2210050001 idler gear with related HW gearbox components (bearings, shafts, synchronizer rings) for convenient repair kits.
• Quality Documentation: We provide certificates of conformity, material test reports, and inspection records upon request to support your local market requirements.

Furthermore, our team welcomes factory visits. If you want to see our production lines and quality control processes firsthand, we are happy to arrange an on-site tour at our facilities in China.

Customer Case Study – How a West African Distributor Grew with the WG2210050001 Idler Gear

In early 2023, a truck parts distributor based in Lagos, Nigeria, approached Mettlead looking for a reliable source of SINOTRUK HW Series Gearbox components. Their previous supplier delivered inconsistent quality — roughly 8% of idler gears arrived out of tolerance, resulting in costly returns and unhappy workshop customers.

After switching to Mettlead, they placed an initial order of 200 units of the Idler Gear WG2210050001. Every piece passed their incoming inspection. Within six months, they doubled their order volume to 400 units per shipment and expanded into neighboring markets in Ghana and Cameroon. Additionally, they adopted our white-label packaging service, which helped them build stronger brand recognition among local mechanics.

Today, this distributor stocks over 150 SKUs of SINOTRUK gearbox parts from Mettlead and reports a product return rate below 0.5%. Their story is a testament to what consistent quality and competitive pricing can do for your business.

Frequently Asked Questions About the Idler Gear WG2210050001

What is the function of the idler gear in the SINOTRUK HW gearbox?

The idler gear WG2210050001 acts as an intermediate gear within the HW Series transmission. It transfers rotational motion between gear shafts while maintaining the correct direction of rotation. Essentially, it bridges the gap between the driving and driven gears, enabling smooth gear engagement and efficient torque delivery throughout the drivetrain.

How do I know when the WG2210050001 idler gear needs replacement?

Common signs include unusual whining or grinding noises from the gearbox, increased difficulty when shifting gears, excessive gear backlash, and visible wear or pitting on the gear teeth during routine transmission inspections. If a driver reports vibration at certain speeds or gears, the idler gear should be among the first components inspected.

Is this idler gear compatible with all SINOTRUK HW gearbox variants?

Yes, the WG2210050001 idler gear is designed to fit the standard SINOTRUK HW Series gearbox family, including the HW19710, HW19712, and related variants used in HOWO A7, T7H, T5G, and SITRAK C7H trucks. However, we always recommend confirming the OEM part number against your specific gearbox assembly drawing before ordering in bulk.

What material is the WG2210050001 idler gear made from?

It is manufactured from high-grade alloy steel that undergoes carburizing and quenching heat treatment. This gives the gear teeth a hard, wear-resistant surface (HRC 58–62) while the core remains tough and ductile. As a result, the gear can withstand heavy shock loads and extended service intervals without premature failure.

Can I order a sample before committing to a full wholesale order?

Absolutely. We encourage new distributors to order samples of the Idler Gear WG2210050001 for testing and quality verification. Once you are satisfied with the fitment and finish, we can discuss volume pricing and regular shipment schedules tailored to your demand cycle.

How should the idler gear be stored before installation?

Store the WG2210050001 in a dry, temperature-controlled environment away from moisture and corrosive chemicals. Keep it in its original packaging until ready for installation. If stored for extended periods, apply a light coat of anti-rust oil to the gear teeth to prevent surface oxidation.

Ready to Stock the Idler Gear WG2210050001 for Your Customers?

Your customers need their SINOTRUK trucks on the road — not sitting idle waiting for parts. By partnering with Mettlead, you get factory-direct access to the Idler Gear WG2210050001 and hundreds of other SINOTRUK HOWO truck parts at prices that make your business more competitive.

Here is what you can expect when you work with us:

• Factory-direct wholesale pricing with flexible MOQs
• Strict quality control — every gear inspected before shipping
• Fast, reliable global delivery via sea and air freight
• White-label and custom packaging to build your brand
• Secure, flexible payment options (T/T, L/C, Trade Assurance)
• Dedicated account manager for responsive communication

Take the next step today. Contact us now to request a quote on the WG2210050001 Idler Gear, ask about volume discounts, or discuss your complete SINOTRUK gearbox parts sourcing needs. Our team typically responds within 12 hours — because in this business, speed matters just as much as quality.