Product Introduction

This precision-machined splined sleeve acts as a torque-transfer coupling between the sun gear and other transmission components in the planetary gearset.

• Structure & Material: Made from high-strength alloy steel, it features both internal and external splines. The surface is carburized and quenched for exceptional hardness and wear resistance.

• Performance: The dual spline design ensures a backlash-free connection, enabling efficient torque transfer while maintaining precise alignment between components.

• 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 spline count and dimensional specifications of the HW19710 transmission’s planetary gear system.

Core Function

1. Torque Transmission: Transmits rotational torque between the sun gear and other components in the planetary gearset.

2. Precision Coupling: The dual spline design ensures precise alignment and backlash-free engagement, reducing noise and vibration.

3. Load Distribution: Evenly distributes torque loads across spline teeth, preventing premature wear and failure.

Transition Sleeve AZ2210100003 – SINOTRUK HW Series Gearbox Parts

When your heavy-duty fleet depends on seamless gear engagement, every component inside the transmission matters. The Transition Sleeve AZ2210100003 is a precision-engineered coupling sleeve designed specifically for the SINOTRUK HW Series Gearbox. Built to handle extreme torque loads and high-frequency shifting cycles, this gearbox transition sleeve ensures smooth synchronization between gears — keeping your trucks on the road and your maintenance costs under control.

At Mettlead, we supply this genuine-spec transition sleeve directly from our factory in China, offering wholesale distributors and spare parts agents competitive pricing, strict quality control, and reliable global delivery. Whether you stock parts for African transport fleets or Middle Eastern logistics operators, this is the coupling sleeve your customers trust.

Key Features and Benefits of Transition Sleeve AZ2210100003

This isn’t just another gearbox component sitting on a shelf. The Transition Sleeve AZ2210100003 is purpose-built to deliver consistent performance under the harshest operating conditions. Here’s what sets it apart:

• Precise OEM Fitment – Manufactured to match original SINOTRUK HW gearbox specifications, so installation is straightforward without machining or modification.
• High-Grade Alloy Steel Construction – Heat-treated for superior wear resistance, ensuring the sleeve withstands repeated gear engagement cycles without premature failure.
• Optimized Spline Profile – The internal and external spline geometry promotes smooth, positive engagement, reducing driver fatigue and protecting synchro rings.
• Extended Service Life – Thanks to precision surface finishing and hardness treatment, this transition sleeve outlasts generic aftermarket alternatives significantly.
• Wholesale-Ready Packaging – Available with white-label or custom packaging options, making it easy for distributors to build their own brand identity.

In short, choosing this SINOTRUK HW gearbox transition sleeve means fewer warranty claims, happier end-users, and stronger margins for your distribution business.

Technical Specifications

Accuracy matters when sourcing transmission components. Below you’ll find the detailed parameters for the Transition Sleeve AZ2210100003:

Application Scenarios – Where Does This Transition Sleeve Fit?

The Transition Sleeve AZ2210100003 is engineered for the SINOTRUK HW series heavy-duty manual transmission. More specifically, it serves as the coupling sleeve responsible for locking selected gear sets to the output shaft during shifting. Here’s where it finds its home:

• SINOTRUK HOWO A7 / T7H Heavy Trucks – Equipped with HW19710 or HW19712 transmissions for long-haul freight and construction applications.
• SINOTRUK SITRAK C7H – Premium heavy-duty logistics trucks utilizing HW Series gearboxes.
• SINOTRUK HOWO Dump Trucks & Tractor Heads – Mining, quarrying, and port operations where the transmission endures constant gear changes under load.
• SINOTRUK STEYR Series – Older fleet models still in active service across Africa, Southeast Asia, and Central Asia.

Whenever you encounter rough shifting, gear slip-out, or abnormal noise during engagement in an HW series gearbox, a worn transition sleeve is often the root cause. Replacing it with a quality-assured AZ2210100003 sleeve restores factory-level performance immediately.

Explore our full range of SINOTRUK HOWO Gearbox Parts and browse more components in our Gearbox Parts Category.

OEM/ODM Capabilities – Built for Your Brand

As a wholesale distributor or regional agent, you need more than just competitive pricing. You need a supplier who can adapt to your market. Here’s what Mettlead offers beyond the part itself:

• White-Label Packaging – We supply the Transition Sleeve AZ2210100003 in neutral packaging, ready for your own branding and labeling.
• Custom Packaging Design – Want your logo, part numbers, and QR codes on the box? We handle it in-house with no minimum design fees.
• Strict Quality Control – Every batch undergoes dimensional inspection, hardness testing, and spline profile verification before shipping.
• Factory Direct Pricing – No middlemen. You deal directly with our manufacturing base in China, which means your landed cost stays low.
• Flexible Payment Terms – We support T/T, L/C, Western Union, and trade assurance platforms for secure transactions.
• Factory Visits Welcome – We encourage distributors to inspect our production lines and quality systems in person.

Whether you’re building a private-label truck parts brand or simply need reliable supply continuity, Mettlead makes it easy to scale your SINOTRUK HOWO truck parts inventory with confidence.

Customer Case Study – Transition Sleeve AZ2210100003 in Action

One of our long-term partners, a truck parts distributor based in Lagos, Nigeria, approached us in early 2023 with a recurring problem. Their local workshop customers kept returning low-quality transition sleeves sourced from generic suppliers — the spline teeth would wear out within 30,000 km, causing gear slip and costly downtime for fleet operators.

After switching their supply to Mettlead’s Transition Sleeve AZ2210100003, the difference was clear within months. Field failure rates dropped by over 80%, and their end-user workshops started requesting the part by name. Within six months, this distributor tripled their order volume for SINOTRUK HW gearbox coupling sleeves and expanded their Mettlead catalog to include synchro rings, shift forks, and gear assemblies.

Today, they carry our white-label packaging and have built a recognized local brand around quality SINOTRUK gearbox parts — all sourced factory-direct through Mettlead.

Frequently Asked Questions – Transition Sleeve AZ2210100003

What exactly does the Transition Sleeve AZ2210100003 do inside the gearbox?

The transition sleeve (also called a coupling sleeve or sliding sleeve) sits on the synchronizer hub. When the driver selects a gear, the shift fork pushes this sleeve forward or backward, and its internal splines engage with the dog teeth on the target gear. Essentially, it’s the component that physically locks the gear to the shaft, transmitting torque from engine to wheels.

How can I tell if the Transition Sleeve AZ2210100003 needs replacing?

Common symptoms of a worn transition sleeve include difficulty engaging specific gears, gear pop-out under load, grinding noises during shifting, and excessive free play in the shift linkage. If the spline teeth are visibly worn, chipped, or rounded, replacement is necessary to prevent further damage to synchronizer rings and gears.

Is this transition sleeve compatible with all HW series gearbox models?

The AZ2210100003 is designed for specific gear positions within the SINOTRUK HW gearbox family. While it fits widely across HW19710, HW15710, and HW19712 variants, we always recommend confirming the part number against your specific gearbox assembly drawing. Our team can assist with cross-referencing if needed.

What material is used, and how does it compare to OEM quality?

Our transition sleeve is manufactured from carburized alloy steel with a surface hardness of HRC 58–62. This matches — and in some cases exceeds — the original SINOTRUK OEM specification. The carburizing process creates a hard, wear-resistant outer layer while maintaining a tough, shock-absorbing core.

Can I order a sample before committing to bulk quantities?

Absolutely. We encourage new partners to order samples for fitment testing and quality evaluation before placing wholesale orders. This way, you can verify compatibility and performance with your end-user workshops before scaling up.

Do you supply other related HW gearbox components?

Yes. Mettlead stocks a comprehensive range of SINOTRUK HW gearbox parts, including synchronizer rings, shift forks, main shaft gears, countershaft assemblies, bearing kits, and gasket sets. You can find our complete gearbox parts catalog in the Gearbox Category Page.

Ready to Stock the Transition Sleeve AZ2210100003?

Your customers need parts that perform. Your business needs margins that make sense. The Transition Sleeve AZ2210100003 for SINOTRUK HW Series Gearbox delivers on both — with factory-direct pricing, verified quality, and packaging flexibility that supports your brand growth.

Take the next step today. Whether you need a sample, a bulk quotation, or technical cross-reference support, our team is ready to help.

Contact Us Now to request your wholesale price list and start building a more profitable parts inventory with Mettlead.