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Howo rear axle reducer assembly (rear section assembly) AZ9909320001, AZ9909320002, WG9909320001

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This product is a rear axle reducer assembly (rear section assembly) compatible with Sinotruk Howo series heavy trucks, covering multiple original equipment manufacturer (OEM) models and suitable for various drive axles and vehicle types. The high-strength housing provides robust load-bearing capacity, while the high-precision spiral bevel gear transmission offers high efficiency and low noise. Some models include a differential lock for harsh road conditions. It features smooth transmission, excellent reduction and torque enhancement, convenient installation, durability, and reliability, making it suitable for various heavy-duty scenarios.

  • Product Details
  • Product Features

Adapted for Sinotruk Howo Series Heavy Truck Rear Axle Reducer Assembly (Rear Section Assembly)

This product is a dedicated rear axle reducer assembly (rear section assembly) adapted for Sinotruk Howo series heavy trucks. It is a core power transmission and torque-increasing component of the heavy truck axle system. Its core function is to accurately transmit the power from the gearbox to the drive wheels, while simultaneously achieving torque reduction and optimization through gear meshing, thus optimizing power output efficiency. It directly determines the vehicle's power performance, driving stability, and load-bearing capacity. It is suitable for various heavy-duty and long-distance transportation scenarios and can directly replace old or damaged parts of the original vehicle without additional adaptation or modification, providing a solid guarantee for the stable and efficient operation of the axle system.

[ART] I. Core Parameters and Compatibility Scope (Precise Matching, Original Factory-Level Compatibility)

Brand and Series: Sinotruk Howo dedicated rear axle reducer assembly, specifically referring to the rear section assembly. Strictly adhering to Sinotruk's original factory design standards and manufacturing processes, its quality is completely consistent with original vehicle parts. Compatible with all Howo series heavy-duty truck models, focusing on meeting the core needs of axle system power transmission and reduction/torque enhancement.

Common Models: Covers multiple common original factory models such as AZ9909320001, AZ9909320002, and WG9909320001. Model identification is clearly marked on the product body, allowing flexible selection based on specific vehicle models and axle specifications, effectively avoiding model mismatches.To prevent mismatches caused by confusion, the compatibility is now more targeted.

Compatible Axles: Precisely compatible with Sinotruk Howo 153, 457, 485, HC16 and other series drive axles, perfectly fitting the structure of each series of drive axles. Precise dimensions and tight connections ensure stable power transmission and torque reduction, meeting the usage requirements of drive axles with different load-bearing specifications.

Applicable Vehicles: Widely used in various heavy-duty truck models such as Sinotruk Howo, Howo A7, Jinwangzi, and Haohan, covering various application scenarios such as long-distance heavy-duty transport, mining operations, and construction site transportation. Adaptable to different loads and road conditions, with strong versatility and precise compatibility.

" [RT] II. Core Structural Features (Precision Manufacturing, Superior Performance)

High-strength Housing, Outstanding Load-Bearing Capacity: Utilizing a high-quality, high-strength alloy steel integral casting housing, the material is tough, hard, wear-resistant, and durable. It can withstand the enormous power loads and complex impacts under heavy-duty conditions for extended periods, and is not prone to bending, cracking, or deformation, effectively extending the service life of the reducer assembly and providing robust structural protection and support for internal gears, differentials, and other components.

Built-in Core Mechanism, Efficient Power Transmission: Internally integrated with high-precision main reducer gears and differential mechanisms, the two work together. The main reducer gears are responsible for achieving speed reduction and torque increase, efficiently transmitting power to the differential; the differential mechanism…The design allows the left and right drive wheels to rotate at different speeds, preventing slippage and wear on the drive wheels during cornering, thus improving driving stability and safety.

High-precision meshing, low noise and high efficiency: Utilizing a high-precision spiral bevel gear meshing design, the gears are machined with high precision and smooth tooth surfaces, resulting in tight meshing and high transmission efficiency. This effectively reduces power loss and improves fuel economy; simultaneously, the meshing noise is low, significantly reducing operating noise during vehicle operation, enhancing ride comfort, and making it suitable for long-distance driving scenarios.

Optional differential lock for harsh conditions: Some models are equipped with a differential lock function. When the vehicle is driving on complex and harsh road conditions such as mud, snow, or mines, and one drive wheel slips, the differential lock can quickly..." The high-speed locking differential allows the left and right drive wheels to rotate synchronously, distributing equal power and significantly improving the vehicle's passability and ability to get out of trouble, adapting to various complex and bumpy road conditions.

III. Core Product Advantages (Durable and Efficient, Suitable for Heavy Loads)

Strong Reduction and Torque Boosting, Stable Power Output: The core reduction and torque boosting performance is excellent, converting the high-speed, low-torque power transmitted by the gearbox into low-speed, high-torque power, meeting the power requirements of heavy-duty trucks in heavy-load and hill-climbing scenarios. Power transmission is smooth and without jerking, ensuring smooth vehicle operation and improving work efficiency.

High-Efficiency Transmission, Energy Saving and Environmentally Friendly: The high-precision spiral bevel gear meshing design results in high transmission efficiency, effectively reducing dynamic emissions.Reduces losses during power transmission, lowers fuel consumption, balances power performance with energy conservation and environmental protection requirements, and reduces operating costs in the long term.

Durable and reliable, adaptable to complex working conditions: High-strength alloy steel shell combined with high-quality internal components, excellent wear resistance, impact resistance, and aging resistance, adaptable to various harsh working environments such as mines, construction sites, high altitudes, and extreme cold, less prone to gear wear, shell cracking, power transmission failure, etc., long service life.

Strong adaptability and convenient installation: Strictly follows Sinotruk original factory specifications and standards, with precise dimensions and minimal tolerances, perfectly matching the original vehicle drive axle and axle system, can directly replace the old rear assembly of the original vehicle without additional drilling or modification; installation process..." Simple and requires no complex professional tools, significantly improving repair and replacement efficiency. Suitable for heavy-duty truck repair shops, fleet bulk repairs, and on-site emergency repair scenarios.

Supplementary Notes

This product is a high-quality Sinotruk Howo dedicated part, using independent sealed protective packaging to effectively prevent damage such as bumps, squeezing, rust, and dust ingress during transportation and storage. It comes with a simple installation guide, clearly indicating installation steps, precautions, and model distinctions for convenient and quick on-site operation. Each product undergoes rigorous factory quality testing to ensure that all indicators such as housing strength, gear precision, transmission efficiency, and differential flexibility meet standards, providing stable operation of heavy-duty truck axle systems and improving power performance and driving safety.Strong support, adaptable to the maintenance, parts replacement, and bulk procurement needs of Sinotruk Howo series heavy trucks.


This product is a rear axle reducer assembly (rear section assembly) compatible with Sinotruk Howo series heavy trucks, covering multiple original equipment manufacturer (OEM) models and suitable for various drive axles and vehicle types. The high-strength housing provides robust load-bearing capacity, while the high-precision spiral bevel gear transmission offers high efficiency and low noise. Some models include a differential lock for harsh road conditions. It features smooth transmission, excellent reduction and torque enhancement, convenient installation, durability, and reliability, making it suitable for various heavy-duty scenarios.

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