The AZ400745410151 Backing Pin Holder Bushing is a precision‑engineered component that provides critical support and wear protection for the backing pin in heavy‑truck suspension systems. Manufactured from high‑strength steel with advanced anti‑wear surface treatment, this bushing ensures smooth, reliable articulation and reduces maintenance frequency. As a vital part of genuine Howo/Sitrak truck parts, the AZ400745410151 is produced to exact OEM specifications, guaranteeing a perfect fit and superior durability in HOWO, SITRAK, and SHACMAN rear suspension applications. Whether you are repairing a worn component during a routine suspension service or performing a complete axle overhaul, this bushing delivers the strength, wear resistance, and long‑term reliability required to maintain axle alignment, reduce tire wear, and ensure safe, stable vehicle handling, minimizing downtime and operational costs.
The AZ400745410151 is not a simple sleeve; it is a precision‑machined bushing that provides a durable, low‑friction bearing surface for the backing pin, ensuring smooth articulation of the rear axle suspension. Manufactured from high‑grade steel with a specialized heat‑treatment process, this bushing offers exceptional resistance to abrasive wear, impact loads, and corrosion. The inner and outer diameters are machined to tight tolerances, providing a precise fit that eliminates play and reduces stress on the pin and surrounding components. The internal surface is finely honed to a smooth finish, which, when lubricated, minimizes friction and promotes long service life even under the heaviest loads.
The bushing’s geometry incorporates chamfered edges to facilitate installation and reduce the risk of edge‑loading. Its flanged design (where applicable) provides additional axial retention, preventing the bushing from walking out under side loads. Every AZ400745410151 is subjected to rigorous dimensional inspection, including bore diameter, wall thickness, and overall length, ensuring it meets the strictest OEM standards. This meticulous attention to detail guarantees that the bushing integrates seamlessly with the backing pin holder and the axle housing, maintaining proper alignment and extending the life of the entire suspension system.
Wear Resistance – The advanced surface hardening of the AZ400745410151 ensures superior resistance to abrasion and galling, even in the presence of dirt and road debris.
Precision Fit – The inner and outer diameters are machined to exacting tolerances, eliminating play and ensuring correct alignment of the backing pin.
High Load Capacity – The robust steel construction and heat treatment enable the bushing to withstand heavy axial and radial loads without deformation.
Thermal Stability – The material maintains its mechanical properties across a wide temperature range, from cold starts to heavy brake heat.
The AZ400745410151 backing pin holder bushing is dimensionally identical to the original equipment component used in the rear suspension of HOWO, SITRAK, and SHACMAN heavy‑duty trucks. It is specifically designed for the HOWO T5G, T7H, and TX series, as well as compatible models with the standard backing pin assembly. The bushing’s dimensions—including outer diameter, inner diameter, length, and flange configuration—match the OEM specifications exactly, ensuring a direct, hassle‑free replacement. By choosing this genuine part, you eliminate the risks associated with aftermarket bushings that may have incorrect dimensions, inferior material hardness, or poor surface finish, which can lead to accelerated wear, pin scoring, and compromised axle alignment.
The AZ400745410151 has been validated through extensive field testing and real‑world fleet operations, confirming its ability to maintain accurate pin alignment and reduce bushing wear over millions of kilometers. Fleets that have standardized on this bushing report fewer suspension repairs, longer tire life, and improved vehicle stability. Its robust construction ensures dependable service in the most demanding operating environments, from long‑haul transportation to heavy construction and mining applications.
Proper installation of the AZ400745410151 is essential to achieve optimal service life and to avoid damaging the bushing or the axle housing. Begin by thoroughly cleaning the bushing bore in the backing pin holder and the pin itself, removing all old debris, grease, and rust. Inspect the bore for any scoring or out‑of‑round condition; if any damage is found, the holder must be reconditioned or replaced. Apply a thin, even layer of high‑quality anti‑seize or assembly lubricant to the outer diameter of the new bushing to facilitate installation and prevent galling.
Using a suitable press tool or hydraulic press, carefully press the new bushing into the bore until it is fully seated against the shoulder or stop. Ensure the bushing is straight and not cocked during installation. After installation, check the inside diameter for any reduction due to press fit; if necessary, use a suitable reamer or hone to restore the correct clearance for the backing pin. Install the backing pin and verify smooth rotation without excessive play. Regular inspection of the AZ400745410151 during routine maintenance is recommended—look for signs of wear, scoring, or seizure. With proper installation, this bushing will provide reliable, long‑lasting service.
Each AZ400745410151 bushing is manufactured in an ISO 9001‑certified facility, ensuring the highest levels of quality and consistency. The raw steel is sourced from approved mills and tested for chemical composition and mechanical properties. The bushing is machined on precision CNC lathes, with critical dimensions verified using air gauges and coordinate measuring machines. After machining, each bushing undergoes a hardness test to confirm it meets the specified range, and a surface finish inspection to ensure the smoothness required for low friction.
Random samples from each batch are subjected to accelerated wear testing and press‑fit force testing to verify that the bushing meets the design criteria. A corrosion resistance test is also performed to validate the protective coating. This comprehensive quality regimen guarantees that every AZ400745410151 delivers the same reliable performance as the original OEM component, giving you full confidence in your suspension repair.
Fleet maintenance teams and suspension specialists have come to rely on the AZ400745410151 because it eliminates axle alignment issues and ensures consistent, reliable support for the backing pin. The bushing’s robust construction and precise fit mean that it can be installed with confidence, reducing the risk of premature wear or failure. Many workshops report a significant decrease in suspension‑related complaints and alignment adjustments after switching to this genuine OEM bushing.
Moreover, the AZ400745410151 is supplied with a protective coating to prevent corrosion during storage and handling. Its clear OEM number and application data simplify parts identification. When you choose this bushing, you are selecting a component that has been engineered and tested to the highest standards, offering the perfect balance of wear resistance, strength, and value.
In summary, the AZ400745410151 Backing Pin Holder Bushing is a precision‑engineered component that provides reliable, long‑lasting support for the backing pin in HOWO, SITRAK, and SHACMAN heavy‑duty suspensions. Its high‑strength steel construction, exact OEM fitment, and advanced surface treatment ensure that it withstands the demands of heavy‑duty operation, maintaining axle alignment and reducing tire wear. By investing in this genuine replacement part, you are protecting your suspension system from premature wear, improving vehicle stability, and lowering overall maintenance costs.
Don’t compromise on suspension integrity – choose the AZ400745410151 for your next axle or suspension service. With its proven track record and widespread acceptance among professionals, this bushing is the smart choice for anyone who values reliability, safety, and peace of mind. Keep your axle aligned and your truck rolling smoothly with the AZ400745410151 – the definitive choice for HOWO and SITRAK professionals.
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