The counter shaft assembly is the backbone of your truck’s transmission, responsible for transferring engine torque through the gear train with exceptional efficiency and durability. The AZ2203030211 Counter shaft assembly (Left) from HOWO is engineered to deliver flawless power transfer, outstanding wear resistance, and a precise factory fit, ensuring that your gearbox operates with the smoothness and reliability that professional drivers demand. As a vital Howo/Sitrak truck parts component, this counter shaft assembly is manufactured from high-grade alloy steel, precision-forged, heat-treated, and ground to exacting tolerances, providing exceptional strength and resistance to fatigue. Whether you are rebuilding a transmission or replacing a worn shaft, the AZ2203030211 guarantees a perfect OEM fit, consistent performance, and extended transmission life – making it the trusted choice for professional workshops and fleet operators worldwide.
The counter shaft assembly is a fundamental component in your transmission, working in tandem with the main shaft to deliver the correct gear ratios for optimal engine performance. The AZ2203030211 is specifically designed for HOWO heavy-duty transmissions, commonly used in T7H, A7, and other models. A worn or damaged counter shaft can lead to excessive gear noise, vibration, reduced power transfer, and eventual transmission failure. HOWO has engineered this assembly with precision-machined gear teeth that ensure smooth, quiet meshing, and a robust shaft construction that resists bending and torsional deformation. Its left-side configuration is tailored to the specific layout of the transmission, ensuring perfect compatibility and seamless installation. With the AZ2203030211, you restore the original power transmission efficiency, reduce noise and vibration, and extend the service life of your gearbox.
Precision Forged
Maximum Strength
Heat-Treated
Wear-Resistant
OEM Grade
Genuine HOWO
Left-Side
Exact Fit
Accurate technical data is essential for correct selection and installation. The AZ2203030211 is manufactured to the highest OEM standards, guaranteeing seamless integration with your HOWO transmission.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | AZ2203030211 | Exact Match |
| Part Name | Counter shaft assembly (Left) | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / HW19710/HW19712 gearbox | Transmission gear train |
| Material | Alloy steel (20CrMnTi) | Carburized & hardened |
| Shaft Diameter | 55 mm | Precision ground |
| Overall Length | 380 mm | End‑to‑end |
| Weight | 6.2 kg | Complete assembly |
| Warranty | 12 Months | Manufacturer Guarantee |
The AZ2203030211 counter shaft assembly is the product of advanced forging, heat treatment, and precision machining processes. The shaft blank is first forged to create a dense, uniform grain structure that offers superior strength and fatigue resistance compared to cast alternatives. The gear teeth are precision-hobbed and then shaved or ground to achieve a mirror-like surface finish, ensuring smooth, quiet meshing and minimal friction. The shaft is then carburized and quenched to develop a hard, wear-resistant surface while maintaining a tough, shock-absorbing core. Final grinding operations ensure that the bearing journals and gear teeth are held to within microns of the nominal dimensions. Each assembly is inspected for tooth profile, lead, runout, and hardness using advanced measuring equipment, guaranteeing that the AZ2203030211 meets HOWO’s exacting quality standards. This meticulous engineering translates into a counter shaft that delivers consistent, reliable power transfer over hundreds of thousands of kilometers.
The AZ2203030211 counter shaft assembly is specifically designed for HOWO heavy-duty trucks equipped with HW19710 and HW19712 series manual and automated transmissions, commonly found in T7H, A7, and derivative models. It is configured for the left‑side installation, matching the original equipment layout. This assembly directly replaces the original counter shaft with identical dimensions, gear tooth profiles, and bearing journal specifications, ensuring a straightforward installation without modifications. It is compatible with all factory-specified bearings, gears, and synchronizers, and it works seamlessly with the existing gear set. This counter shaft is also compatible with many Sinotruk and other commercial vehicles that share the same transmission architecture. To confirm fitment, always cross-reference the OEM number on your existing shaft with AZ2203030211. If they match, this component will integrate flawlessly. Keeping this assembly in your spare parts inventory enables rapid transmission overhauls, minimising downtime and preserving the performance and reliability of your drivetrain.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
HW19710/HW19712
Transmission Series
Direct Replacement
No Mods
Replacing a worn or damaged counter shaft assembly with the AZ2203030211 immediately restores the precision and efficiency of your transmission. The perfectly formed gear teeth ensure smooth, quiet meshing, reducing noise and vibration within the gearbox. The correct tooth profile and accurate spacing minimize backlash, reducing shock loads on bearings and shafts, which extends the life of the entire transmission. The hardened surface provides excellent resistance to pitting and wear, maintaining the shaft’s performance over extended service intervals. Improved gear engagement also translates to more efficient power transfer, reducing parasitic losses and contributing to better fuel economy. For fleet operators, a reliable counter shaft reduces the risk of transmission failures, lowers maintenance costs, and helps maintain the performance and reliability of your vehicles. By investing in the AZ2203030211, you ensure that your HOWO truck’s transmission delivers the smooth, dependable power delivery that professional drivers and fleet managers rely on.
Installing the AZ2203030211 counter shaft assembly requires careful attention to detail and proper tooling. Begin by safely removing the transmission and disassembling it according to the manufacturer’s service manual. Inspect the mating gears, bearings, and synchronizers for wear; replace any components that do not meet specifications. Clean the new shaft assembly thoroughly to remove any protective oil or debris. When installing, ensure that the shaft is correctly aligned with the main shaft and that the bearing clearances are set to the specified values. Use a suitable press or installation tool to fit the bearings onto the shaft, taking care not to damage the bearing journals. Lubricate all bearing surfaces with clean transmission oil before assembly. Reassemble the transmission, torquing all bolts to specification, and fill with the correct grade of lubricant. After installation, test the transmission for smooth shifting and listen for any unusual noises. Periodically inspect the shaft and its associated components during routine transmission oil changes. With proper installation, the AZ2203030211 will provide years of reliable service.
Pro Tip: When replacing the counter shaft assembly, it is recommended to replace the associated bearings and synchronizers as a set to ensure optimal performance and longevity. The AZ2203030211 is designed to work with OEM‑spec components; using genuine parts ensures correct fitment and long service life.
Genuine HOWO components are engineered to the highest standards, and the AZ2203030211 counter shaft assembly is no exception. Aftermarket shafts often use inferior steel, inconsistent heat treatment, or imprecise gear geometry, leading to premature wear, noise, and eventual failure. HOWO’s shaft is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance. By choosing the AZ2203030211, you benefit from HOWO’s rigorous testing, including fatigue, wear, and corrosion resistance tests. This ensures that the shaft meets the demanding requirements of heavy-duty trucking. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s global network, giving you confidence in your purchase.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which transmissions use the AZ2203030211?
A: It is used in HOWO HW19710 and HW19712 series manual and automated transmissions, commonly found in T7H, A7, and other heavy-duty trucks. This is the left‑side version.
Q: What are the symptoms of a worn counter shaft?
A: Gear whine, growling noise, vibration, difficult shifting, and metal particles in the transmission oil are common indicators.
Q: Can I replace just the shaft without replacing the gears?
A: Yes, if the gears are in good condition. However, it is recommended to inspect all mating components and replace them if worn to ensure optimal performance.
Q: How do I verify the correct part?
A: Check the OEM number on your existing shaft. If it matches AZ2203030211, this is the exact replacement. Consult your vehicle’s parts manual for additional confirmation.
Order your AZ2203030211 Counter Shaft Assembly today! Explore our complete selection of genuine HOWO and Sinotruk transmission components at Howo/Sitrak truck parts and keep your gearbox performing at its peak.
The AZ2203030211 Counter Shaft Assembly (Left) from HOWO is a testament to precision engineering and uncompromising quality. By choosing this genuine component, you ensure that your transmission delivers the smooth, reliable power transfer required for modern heavy-duty trucking. Whether you are a professional transmission builder or a fleet manager, this assembly offers the performance, durability, and exact fit that you can count on. Trust HOWO – the benchmark for excellence in heavy-duty truck components – and experience the difference that genuine quality makes.
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