Product Introduction

This precision-engineered sun gear is the heart of the planetary gearset, driving the transmission’s torque multiplication and gear reduction functions.

• Structure & Material: Made from high-strength alloy steel, it features external helical teeth that mesh with the planet gears and an internal bore for mounting on the transmission shaft. The surface is heat-treated for exceptional wear and impact resistance.

• Performance: The precisely cut helical teeth ensure smooth, quiet meshing with planet gears, providing efficient torque transfer and reducing noise and vibration. The hardened surface resists wear from high loads and continuous operation.

• Durability: The hardened steel construction withstands high torque loads, shock, and friction, ensuring long service life even under harsh operating conditions.

• Compatibility: Direct OE replacement, fully matching the tooth profile and dimensional specifications of the HW19710 transmission’s planetary gear system.

Core Function

1. Torque Transmission: Acts as the central drive gear, transmitting rotational torque from the input shaft to the planet gears.

2. Gear Ratio Control: Works with the planet gears and ring gear to provide different gear ratios for the transmission.

3. Smooth Operation: The helical tooth design ensures smooth, quiet power transfer, reducing noise and vibration.

Sun Gear WG2210100001 – SINOTRUK HW Series Gearbox Replacement Part

When your SINOTRUK HW series gearbox demands a reliable sun gear replacement, the Sun Gear WG2210100001 delivers the precise fit and proven durability your fleet needs. Engineered to meet OEM specifications, this planetary sun gear keeps your heavy-duty transmission running smoothly — minimizing costly downtime and maximizing operational efficiency. As a factory-direct supplier of genuine SINOTRUK gearbox parts, Mettlead puts competitive pricing and fast delivery right at your fingertips.

Why Choose the Sun Gear WG2210100001 for Your SINOTRUK HW Gearbox

The sun gear sits at the heart of the planetary gear system inside the HW series transmission. It transmits torque from the input shaft to the planet gears, which means any wear or damage directly affects shifting quality, power transfer, and overall gearbox lifespan. Therefore, selecting a high-quality replacement sun gear is not just maintenance — it is an investment in your vehicle’s long-term performance.

Key Features and Benefits

• OEM Part Number WG2210100001 — Guarantees a direct, hassle-free fit for SINOTRUK HW series gearboxes without any modification.
• Premium Alloy Steel Construction — Heat-treated and precision-machined to withstand extreme torque loads and resist premature wear.
• Strict Quality Control — Every sun gear undergoes dimensional inspection and hardness testing before leaving our facility, so you receive parts that perform from day one.
• Extended Gearbox Life — Smooth tooth engagement reduces vibration and noise, protecting surrounding planetary components from accelerated degradation.
• Factory-Direct Pricing — By sourcing directly from Mettlead, you eliminate middlemen and secure a competitive unit cost that protects your margins.
• Fast and Reliable Delivery — Maintained stock levels and established logistics networks mean your parts arrive when you need them, not weeks later.

Application and Compatible Vehicle Models

The Sun Gear WG2210100001 is specifically designed as a SINOTRUK HW series gearbox component. It finds its home in a wide range of heavy-duty applications, including:

• SINOTRUK HOWO A7 heavy-duty trucks equipped with HW19710 / HW19712 transmissions
• SINOTRUK HOWO T7H and T5G models using HW series manual gearboxes
• SITRAK C7H heavy tractors with HW gearbox configurations
• Various mining, construction, and long-haul logistics vehicles fitted with SINOTRUK HW planetary transmission systems

Whether your fleet operates on highways, rugged construction sites, or mining roads, this sun gear is built to endure the toughest working conditions. For more compatible gearbox parts, explore our dedicated Gearbox Parts Collection and SINOTRUK HOWO Gearbox Parts pages.

Technical Specifications – Sun Gear WG2210100001

OEM/ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different branding needs. That is why we offer flexible white-label and custom packaging services for the Sun Gear WG2210100001 and all our SINOTRUK gearbox components. Here is what we can do for you:

• White-Label Supply — Receive parts in neutral packaging, ready for your own brand labeling and distribution.
• Custom Packaging — We print your logo, part numbers, and brand identity directly on the box, giving your customers a seamless branded experience.
• Bulk OEM Orders — Large-volume buyers enjoy tiered pricing and priority production scheduling.
• Quality Documentation — We provide inspection reports, material certificates, and packing lists tailored to your import requirements.

In addition, we welcome international buyers to visit our facility in China for on-site quality audits and face-to-face discussions. Browse our full range of SINOTRUK HOWO Truck Parts to see what else we can supply under one roof.

Customer Case Study — Sun Gear WG2210100001 Bulk Order for East African Fleet

In early 2024, a fleet management company operating over 200 SINOTRUK HOWO trucks across Kenya and Tanzania reached out to Mettlead with an urgent need. Their vehicles were experiencing gearbox noise and difficulty shifting — classic symptoms of worn sun gears in the HW planetary system.

After evaluating the situation, our team recommended the Sun Gear WG2210100001 as a direct replacement. The customer initially ordered 50 pieces for testing. Once their workshop confirmed the fitment and quality matched their OEM expectations, they followed up with a standing quarterly order of 150 units.

The result? Transmission repair turnaround dropped from five days to two days, because parts were always in stock. Meanwhile, unit costs fell by over 30% compared to their previous supply channel. Today, this client sources not only sun gears but also countershaft gears, synchronizer rings, and output shaft components through Mettlead — all for their SINOTRUK HW gearbox maintenance program.

Frequently Asked Questions — Sun Gear WG2210100001

What is the function of the sun gear in a SINOTRUK HW gearbox?

The sun gear is the central gear in the planetary gear set. It meshes with multiple planet gears to distribute torque evenly across the transmission. In the HW series gearbox, the Sun Gear WG2210100001 plays a critical role in smooth gear engagement and efficient power delivery from the engine to the drivetrain.

How do I know when the Sun Gear WG2210100001 needs replacing?

Common signs of a worn sun gear include abnormal metallic noise during gear shifts, difficulty engaging certain gears, and excessive vibration from the gearbox housing. If disassembly reveals pitting, chipping, or uneven wear on the gear teeth, replacement is necessary to prevent cascading damage to planet gears and the ring gear.

Is this sun gear an OEM original part or aftermarket?

The Sun Gear WG2210100001 supplied by Mettlead is an OEM-equivalent aftermarket part. It is manufactured to the same dimensional tolerances, material specifications, and heat-treatment standards as the original. This ensures a perfect fit and comparable lifespan at a more competitive price point.

Can I order the Sun Gear WG2210100001 together with other HW gearbox components?

Absolutely. Many of our customers order complete gearbox rebuild kits that include the sun gear, planet gears, bearings, synchronizer assemblies, and seals. Bundling parts in a single shipment reduces freight costs and simplifies your procurement process. Check our SINOTRUK HOWO Gearbox Parts page for the full catalog.

What is the typical lead time for bulk orders of Sun Gear WG2210100001?

For standard stock quantities (up to 100 pieces), we typically ship within 3–5 business days. Larger orders or custom-packaged batches may require 10–15 business days for production and quality inspection. We always confirm exact delivery timelines before order confirmation.

How is the sun gear packaged to prevent damage during shipping?

Each Sun Gear WG2210100001 is individually wrapped in anti-rust oil paper, placed in a protective carton, and secured within a reinforced outer box. For sea freight shipments, we use wooden crates with foam inserts to absorb shock and prevent moisture damage during transit.

Get a Competitive Quote for Sun Gear WG2210100001 Today

Ready to secure reliable, factory-direct pricing on the Sun Gear WG2210100001 for SINOTRUK HW Series Gearbox? Whether you need 10 pieces or 10,000, our team is standing by to provide a detailed quotation with transparent pricing, lead times, and shipping options tailored to your destination.

Take the next step — Contact Us now to request your personalized quote, ask technical questions, or schedule a factory visit. Let Mettlead be your trusted supply partner for SINOTRUK gearbox parts and beyond.