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- Wanda Plaza, Jinan, Shandong, China
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AZ2208100003 is the genuine Sinotruk Howo cylindrical roller (specification 11X18Ⅲb Gb4661) precision‑engineered for heavy‑duty chassis systems. This critical component belongs to the trusted family of Sinotruk Howo parts, ensuring reliable rolling elements in gearboxes, differentials, and wheel hubs. Manufactured from high‑grade GCr15 bearing steel and heat‑treated to GB/T 18254 standards, the AZ2208100003 roller guarantees exceptional load capacity, wear resistance, and longevity under extreme operating conditions. Its cylindrical profile with controlled crowning reduces edge stress, making it ideal for high‑radial‑load applications in Howo chassis assemblies.
The AZ2208100003 roller is manufactured from vacuum‑degassed GCr15 bearing steel (equivalent to 100Cr6), conforming to GB/T 18254. This material offers high hardness, excellent wear resistance, and fatigue strength. After precision cold forming, each roller undergoes a martensitic hardening process (58‑62 HRC) followed by sub‑zero treatment to ensure dimensional stability. The result is a roller capable of supporting heavy radial loads while resisting plastic deformation.
Dimensional precision is critical for rolling element performance. The Cylindrical Roller features a nominal diameter of 11 mm and length of 18 mm, with tolerances held to within 0.005 mm (Grade G10 according to GB4661). The cylindrical surface is super‑finished to a roughness Ra ≤ 0.1 μm, reducing friction and ensuring even load distribution. Each roller is 100% inspected for dimensional accuracy and surface defects.
The AZ2208100003 roller maintains its hardness and dimensional stability up to 150°C, making it suitable for continuous operation in gearboxes and axle hubs where temperatures can rise. Its case‑hardened layer (minimum depth 1.5 mm) provides a tough core to absorb shock loads while the hard surface resists rolling contact fatigue. Dynamic load rating (Cr) is calculated at 22.8 kN per roller in typical bearing assemblies.
Fatigue life testing according to ISO 281 demonstrates that the AZ2208100003 achieves L10 life exceeding 10,000 hours under rated load in Howo axle applications. The logarithmic crowning profile (optimised by FEA) minimises edge stress, preventing premature spalling. With a cleanliness rating of J6 (ASTM E45), the steel is virtually free of non‑metallic inclusions that could initiate cracks.
The AZ2208100003 roller is a direct replacement for the needle/cylindrical rollers used in the countershaft assemblies of Howo 9‑speed and 16‑speed gearboxes. It ensures smooth gear engagement and torque transmission under varying loads, reducing friction and heat generation.
In the rear differential, AZ2208100003 rollers are used in the planetary gear sets of hub reduction axles. They support the planet gears, allowing them to rotate freely while withstanding high torque and shock loads during off‑road operation. The precise crowning prevents edge loading even under axle deflection.
These rollers are also found in the transfer case and PTO (power take‑off) units. Their high hardness and fatigue resistance ensure long service life in demanding environments, such as construction and mining trucks, where contamination and heavy loads are common.
When replacing the AZ2208100003 rollers, always clean the bearing housing and shafts thoroughly. Inspect raceways for pitting or wear. Use a suitable mounting tool to avoid damaging the roller surfaces. Apply a thin film of assembly oil to prevent initial dry running. Ensure that rollers are installed with the correct endplay as per service manual specifications.
During routine maintenance, check for any metallic debris in the lubricant, which could indicate roller spalling. If any Cylindrical Roller shows signs of fatigue, replace all rollers in the same bearing set to maintain even load distribution. Store spare rollers in a dry, rust‑free environment, preferably coated with anti‑rust oil.
Genuine Sinotruk Howo parts such as the AZ2208100003 roller are manufactured to the strict metallurgical and geometrical specifications defined by the original equipment. Generic rollers often use lower‑grade steel with inconsistent hardness and insufficient case depth, leading to premature spalling, noise, and even catastrophic bearing failure. The genuine AZ2208100003 is subjected to 100% eddy current testing and comes with full traceability, ensuring that each roller meets GB4661 Grade IIIb quality. By choosing genuine, you protect your Howo drivetrain from unscheduled downtime and expensive repairs. The complete Sinotruk Howo parts portfolio includes rollers, bearings, seals, and more – all engineered for maximum reliability.
The AZ2208100003 roller might seem like a small component, but its performance is vital to the entire driveline. A failed roller can lead to gear tooth breakage, shaft scoring, and loss of vehicle mobility. With genuine Howo parts, you get the peace of mind that comes from rigorous quality control and field validation. Fleet operators worldwide trust genuine AZ2208100003 rollers to keep their trucks on the road, reducing total cost of ownership. Always insist on parts that carry the Sinotruk Howo brand.
The AZ2208100003 roller is used across a wide range of Howo models: T7H, T5G, A7, and traditional Howo‑7 series. It fits gearboxes with part numbers HW19710, HW19712, and HW25716, as well as rear axles HC16, HC18, and ST16. Always verify the roller count per bearing (typically 22‑26 rollers) and the raceway profile to ensure proper fit.
Each AZ2208100003 is individually packed in a VCI (volatile corrosion inhibitor) paper to prevent rust during storage. The packaging is clearly labelled with the OEM number, quantity, and date code. For high‑volume users, bulk packaging in sealed plastic drums is available through authorised distributors.
Production of the AZ2208100003 takes place in ISO/TS 16949 certified facilities, using precision grinding lines with in‑process gauging. Statistical process control ensures that dimensional variations are kept to a minimum, far exceeding the requirements of GB4661. Every batch is accompanied by a material certificate and hardness test report, guaranteeing that the rollers delivered are identical to those fitted on new Howo trucks at the factory.
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