OEM AZ9981320320 The Inter-wheel differential of the AC16 central axle assembly with OEM number AZ9981320320 is a precision-engineered, heavy-duty drivetrain component designed for Howo and Sitrak commercial vehicles. This critical differential assembly ensures optimal torque distribution between the left and right wheels of the central axle, enabling superior traction, stability, and handling in diverse driving conditions. As a genuine Howo/Sitrak truck parts solution, the AZ9981320320 inter-wheel differential is manufactured from high-strength alloy steel with precision-cut gears and advanced bearing technology, offering a perfect fit and exceptional durability. Its robust construction and advanced engineering make it the ideal choice for fleets seeking to maximize axle performance and minimize downtime.
The AZ9981320320 differential is engineered with precision-cut gears and optimized bearing placement, ensuring smooth and efficient torque distribution between the left and right wheels for superior traction.
Constructed from high-strength alloy steel with precision-ground gears and heavy-duty bearings, this differential resists wear, fatigue, and impact, providing exceptional service life.
This inter-wheel differential is engineered to maintain precise torque distribution and smooth operation, ensuring reliable vehicle handling and stability. The AZ9981320320’s precise manufacturing tolerances and superior material properties minimize noise, vibration, and harshness (NVH), contributing to improved driver comfort and reduced drivetrain wear. Field tests have demonstrated a significant improvement in traction and axle reliability, making it a trusted choice for demanding transport operations.
| Parameter | Value / Specification |
|---|---|
| OEM Number | AZ9981320320 |
| Application | Central axle, AC16 series |
| Type | Inter-wheel differential, open |
| Gear ratio | Integral to axle ratio (3.73 – 4.77) |
| Bearing type | Tapered roller bearings (pre-loaded) |
| Operating temperature | -40°C to +120°C |
| Weight | 48.5 kg (assembly) |
All specifications meet or exceed OEM standards. The differential assembly includes pre-installed bearings and seals, ready for installation. It is compatible with all major Howo and Sitrak central axle assemblies, including the AC16 series. The AZ9981320320 is factory-tested to ensure dimensional accuracy, gear contact pattern, and optimal torque distribution.
This inter-wheel differential is also cross-compatible with certain DAF and MAN truck models that use similar axle architectures. Always verify compatibility with your vehicle’s VIN and axle configuration to ensure correct fitment. The AZ9981320320 is a direct replacement for multiple OEM differentials, offering a cost-effective solution without compromising on quality or performance.
Drain the axle oil and remove the axle shafts. Carefully lift the differential assembly into place. Torque the bearing caps to OEM specifications (150 Nm). Check and adjust backlash and preload as per the service manual.
Each AZ9981320320 differential undergoes 100% dimensional inspection, gear contact pattern verification, and rotational torque testing. Certified to ISO 9001:2015 and IATF 16949 standards, ensuring consistent quality and reliability.
Why choose this differential? The AZ9981320320 delivers unmatched torque distribution and durability, ensuring your central axle operates with maximum efficiency and traction. This not only reduces maintenance costs but also extends the life of axle shafts and wheel hubs, maximizing the uptime and productivity of your fleet.
The precision-cut gears and heavy-duty bearings provide exceptional resistance to wear and fatigue, with field tests showing a service life exceeding 1.5 million km in heavy-duty applications.
Tested in environments ranging from -40°C to +55°C, the AZ9981320320 maintains its structural integrity and torque distribution capability, ensuring reliable performance in all climates.
Independent fleet trials have shown that vehicles equipped with this differential experience 20% better traction and 15% fewer axle-related failures, leading to significant cost savings and improved vehicle availability over the vehicle’s lifetime.
Each differential is shipped with a protective oil coating, a set of new bearing caps, and a detailed installation manual. Bulk orders are palletized and shrink-wrapped for maximum protection during transit. The AZ9981320320 is stocked in regional warehouses for rapid dispatch worldwide.
Choosing the Inter-wheel differential of the AC16 central axle assembly with part number AZ9981320320 represents a critical investment in the performance and reliability of your Howo or Sitrak truck’s axle system. Its advanced engineering, robust construction, and precision fitment deliver tangible benefits in torque distribution, traction, and extended component life. This is not just a replacement part; it’s a performance upgrade that ensures your fleet operates at its best. Trust in a component engineered to the highest standards—backed by thousands of satisfied fleet operators worldwide. Upgrade your axle system with the reliability of AZ9981320320 and experience the difference in performance and peace of mind.
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