Sinotruk HOWO Series Heavy Truck Second Axle Inter-Axle Transition Swing Arm

This product is a Sinotruk HOWO series heavy truck second axle inter-axle transition swing arm. Arm (commonly known as the "big biscuit" swing arm) is a key connection and buffer component of the heavy-duty truck chassis system. It directly determines the connection stability between the second axle (middle axle) and the frame, the ride smoothness, and the reliability of the chassis system. It is compatible with Howo series heavy-duty trucks using a double-bore rear suspension structure. Strictly following original factory standards in research and development, it can directly replace old or damaged original factory parts without additional adaptation modifications. It precisely matches the original vehicle dimensions, providing a solid guarantee for the stable and efficient operation of the chassis system.

I. OE Number and Compatibility Marking (Precise Correspondence, Original Factory Compatibility)

Core OE Number: 477135: This number is the original factory standard OE number, clearly marked on the component surface for quick identification, selection, procurement, and replacement. It effectively avoids compatibility errors caused by model confusion, ensuring perfect compatibility with the double-bore rear suspension structure. No secondary processing or adjustment is required; it can be installed directly out of the box, significantly improving maintenance and replacement efficiency.

Number: ID:00203 / 240321: Except for the core OE number,The component is also marked with auxiliary numbers ID: 00203 and 240321, serving as supplementary identifiers for compatibility verification. This further ensures the accuracy of component selection and is compatible with mainstream heavy-duty truck models such as Sinotruk Howo A7, Howo T7H, Howo TX, and Howo Han, which adopt a double-hole rear suspension structure. It covers different models and heavy-duty configurations in this series.

II. Core Functions (Connection and Buffer, Stability Protection)

Transition Connection, Force Transmission: As a dedicated transition connection component between the second axle (middle axle) and the chassis, it builds a force transmission bridge between the two. It can smoothly transmit longitudinal forces, lateral forces, and forces generated by road impacts during vehicle operation, ensuring the stability of the second axle and the chassis." The relative positions between the frames are stable, preventing offset and swaying, and ensuring the normal operation of the chassis system.

Buffering and shock absorption, improving ride smoothness: The core plays a buffering and shock absorption role, effectively absorbing and buffering the impact of road bumps, rapid acceleration, sudden braking, and cornering, reducing the transmission of vibration to the frame and body, reducing the bumpy feeling for passengers, and reducing wear on various chassis components, significantly improving the smoothness and comfort of vehicle driving.

Bearing alternating loads, adapting to complex working conditions: Using high-strength materials and precision machining technology, it has excellent strength, rigidity, and fatigue resistance, and can withstand alternating loads under complex working conditions such as heavy truck loads, mountain roads, and bumpy roads for a long time, avoiding damage due to load...Excessive size and impact can cause deformation, cracking, and breakage of the control arm, ensuring the structural stability and operational reliability of the chassis system.

Enhanced connection stability and extended chassis life: The unique double-hole design effectively enhances the stability of the connection with the second axle and frame, as well as the overall load-bearing capacity, disperses stress, reduces local stress concentration, further improves the reliability of the chassis system, extends the service life of the second axle, suspension, and related components, and reduces later maintenance costs.

III. Product Structure and Material Characteristics (Precision Manufacturing, Durable and Robust)

Excellent Material and Outstanding Strength: Made of high-quality, high-strength ductile iron or cast steel through precision casting." Both materials possess uniform density, excellent toughness, and high hardness. Through rigorous heat treatment processes (quenching and tempering), the strength, rigidity, and fatigue resistance of the swing arm are further enhanced. It can withstand repeated testing under complex working conditions for extended periods, and is less prone to wear, cracking, deformation, and other failures, ensuring load-bearing and connection safety.

Dual-large-hole design for superior load-bearing capacity: Adopting a dedicated dual-large-hole structure design, the hole size and spacing strictly adhere to original factory standards, precisely matching the dual-large-hole rear suspension structure. Compared to ordinary structures, this significantly enhances connection stability and load-bearing capacity, disperses stress, avoids localized stress concentration, and effectively improves the reliability and service life of the chassis system.

Precision machining for excellent adaptability.Strong: Manufactured through precision casting, CNC machining, grinding and polishing, etc., the surface is smooth without burrs or sand holes. Hole positioning is precise with minimal dimensional error, ensuring a perfect fit and connection with the second axle and frame, eliminating any risk of loosening after assembly. Specifically designed for double-hole rear suspensions, it is compatible with multiple Howo models, directly replacing original parts, offering strong versatility and convenient installation.

Corrosion and wear resistance, extended lifespan: The surface undergoes professional anti-corrosion treatment (galvanizing, painting, or electrophoresis), forming a dense protective coating that effectively resists rainwater, dust, mud, corrosive gases, and road salt, preventing rust and corrosion of the control arms. Suitable for the complex outdoor driving needs of heavy trucks, significantly extending product lifespan.

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IV. Compatible Vehicle Models (Precise Matching, No Adaptation Required)

This product is specifically designed for Sinotruk Howo series heavy trucks with a double-hole rear suspension structure, precisely compatible with the following models: Sinotruk Howo A7, Sinotruk Howo T7H, Sinotruk Howo TX, Howo Han, and other mainstream heavy truck models, covering different years and heavy-duty configurations of this series. It can be directly connected to the original chassis system, perfectly matching the second axle and frame installation dimensions. It can be installed immediately upon opening the box, providing a convenient and reliable solution for vehicle maintenance and parts replacement.

Additional Notes: This product uses independent protective packaging to effectively avoid damage such as bumps, scratches, and deformation during transportation; it comes with detailed installation instructions, clearly outlining the steps.Clear and easy to understand, even those without professional repair experience can complete the installation by following the instructions. Furthermore, the products undergo rigorous factory quality testing, and each unit meets original factory standards, providing strong support for the safe and stable operation of the heavy-duty truck chassis system.