| No. | Part No. | Name |
|---|---|---|
| 1 | WG9925688102 | Shock Absorber Upper Bracket Assembly |
| 2 | WG9925688101 | Shock Absorber |
| 3 | WG9925688122 | Spacer Plate |
| 4 | ZQ151B1445TF6 | Hexagon Head Bolt M14*1.5 |
| 5 | ZQ361B14T13F6 | Type 2 Hexagonal Nut M14*1.5 |
| 6 | WG9925688135 | Washer |
| 7 | WG9925688110 | Bolt |
| 8 | WG9925688115 | Washer |
| 9 | ZQ361B16 | Type 2 Hexagonal Nut M16*1.5 |
| 10 | WG9925688120 | Pin |
| 11 | WG9925688125 | Washer |
| 12 | ZQ361B18 | Type 2 Hexagonal Nut M18*1.5 |
The Shock Absorber Upper Bracket Assembly is the primary mounting structure that secures the Rear Air Suspension Shock Absorber to the chassis frame. Manufactured from high-strength steel, this bracket evenly distributes vertical and lateral forces, reducing stress concentration points. Its precision-engineered geometry ensures perfect alignment with the vehicle’s mounting holes, allowing for a straightforward installation process. The bracket also incorporates anti-corrosion coating, which extends service life even in harsh operating environments.
The Shock Absorber is the core damping element of the rear air suspension system. It converts kinetic energy from road irregularities into thermal energy through hydraulic fluid displacement, effectively smoothing out vibrations. This twin-tube gas-charged design provides consistent damping force across a wide temperature range, ensuring stable vehicle handling under both empty and fully loaded conditions. The unit is factory-calibrated to match the Sitrak C7H’s weight distribution and axle geometry.
The Spacer Plate sits between the shock absorber and the bracket assembly, serving as an interface that corrects any minor alignment deviations. Made from wear-resistant alloy, it prevents metal-to-metal contact and reduces the risk of premature wear. The plate also acts as a shim to fine-tune the ride height, ensuring that the air suspension operates within its optimal travel range. Its surface is precision-ground to guarantee a flush fit with adjacent components.
The Hexagon Head Bolt M14*1.5 is a high-tensile fastening element used to secure the upper bracket and shock absorber assembly to the chassis. With a fine pitch thread, it provides excellent clamp load and resistance to loosening under dynamic loads. The bolt features a corrosion-resistant finish, making it suitable for long-term exposure to moisture and road salts. Its hexagonal head allows for easy torque application using standard hand tools.
The Type 2 Hexagonal Nut M14*1.5 is the matching fastener for the M14 bolt, offering a secure locking mechanism. Its Type 2 design incorporates a taller profile that increases thread engagement, thereby improving resistance to vibrational loosening. The nut is heat-treated to achieve consistent hardness, and its fine threads enable precise torque control during assembly. This nut is essential for maintaining the structural integrity of the suspension joint.
This Washer is a flat, hardened steel ring placed under the bolt head or nut to distribute clamping pressure over a larger area. By spreading the load, it protects the bracket and spacer surfaces from indentation and galling. The washer also provides a smooth bearing surface that reduces friction during tightening, allowing for more accurate torque readings. Its dimensions are precisely matched to the M14 fastener series.
This Bolt is a specialized fastening component used in secondary mounting points within the rear suspension assembly. It features a fully threaded shank and a hex head designed for high-clamp applications. The bolt is manufactured from medium-carbon steel and undergoes a quench-and-temper process to achieve Grade 10.9 strength. Its role is critical in securing auxiliary brackets and sensors that support the air suspension’s electronic control functions.
This second Washer variant is utilized in conjunction with the M16 fastening group. It offers a larger outer diameter compared to the M14 washer, providing enhanced load distribution for heavier-duty connections. The washer is phosphate-coated for added corrosion resistance, and its thickness is carefully controlled to maintain consistent stack-up height. It plays a vital role in preserving the clamping force of the M16 bolt-nut pair.
The Type 2 Hexagonal Nut M16*1.5 is a heavy-duty nut designed for the M16 bolt series. Its fine-pitch thread allows for higher preload with lower tightening torque, reducing the risk of thread stripping. The nut’s Type 2 configuration provides additional thread depth, which enhances the locking effect under severe vibration. This nut is commonly used at the lower mounting points of the shock absorber where forces are greatest.
The Pin is a cylindrical retaining element that locks pivotal joints within the suspension linkage. It is precision-machined to tight tolerances and case-hardened to resist wear and shear forces. The pin passes through aligned holes in the bracket and the shock absorber eyelet, secured by a cotter or retaining clip. This design allows for limited articulation while preventing axial disengagement, ensuring that the suspension remains fully captive during operation.
This third Washer is engineered for use with the M18 fastener group, featuring an even larger footprint to accommodate the higher loads associated with the primary suspension pivot. The washer is made from spring steel and may include a slight curvature to act as a lock washer, providing spring tension that resists loosening. Its surface is zinc-plated to prevent galvanic corrosion when in contact with dissimilar metals.
The Type 2 Hexagonal Nut M18*1.5 is the largest nut in the fastening set, securing the main pivot bolt of the rear air suspension. Its coarse thread pitch ensures rapid assembly while still providing ample clamp force. The nut is manufactured to ISO metric standards and features a prevailing-torque locking element that prevents back-off even under extreme articulation. This nut is the final piece in the mechanical chain that keeps the shock absorber firmly anchored.
Every Rear Air Suspension Shock Absorber is manufactured to Sinotruk’s original equipment specifications, using the same materials and tolerances as the factory-fitted unit. This guarantees perfect fitment and performance that matches the vehicle’s original ride and handling characteristics.
The advanced hydraulic valving system delivers consistent damping force across all load conditions, from empty to maximum gross vehicle weight. This results in reduced body roll, improved tire contact, and shorter stopping distances on uneven surfaces.
Built with heavy-duty seals, high-grade oil, and corrosion-resistant coatings, this shock absorber withstands extreme temperatures, moisture, and road debris. Rigorous endurance testing confirms a service life that exceeds aftermarket alternatives by up to 40%.
All mounting holes, bolt patterns, and thread specifications are identical to the original Sitrak C7H parts. The included fasteners and spacers eliminate the need for modifications, reducing downtime and ensuring a hassle-free replacement process.
The Rear Air Suspension Shock Absorber is a vital component in the Sitrak C7H’s chassis system, directly influencing ride quality and vehicle stability. It works in tandem with air springs to manage axle movement, keeping the tires firmly planted on the road surface. This synergy between the air spring and the shock absorber is what gives the C7H its renowned comfort and load-carrying capability.
When the vehicle encounters a bump or pothole, the air spring compresses to absorb the initial impact, while the Rear Air Suspension Shock Absorber damps the resulting oscillation. Without a properly functioning shock absorber, the air spring would continue to bounce, leading to poor handling and accelerated wear on other suspension components. Our shock absorber ensures that this energy is dissipated quickly and smoothly.
Regular inspection of the Rear Air Suspension Shock Absorber is recommended every 50,000 kilometers, especially for trucks operating in off-road or construction environments. Signs of wear include fluid leakage, reduced damping effect, and unusual knocking noises from the rear axle area. Replacing worn units with our genuine components restores the vehicle’s original performance and safety margins.
The installation process for the Rear Air Suspension Shock Absorber is straightforward, thanks to the pre-assembled bracket and the included hardware kit. All fasteners – including the Hexagon Head Bolt M14*1.5, Type 2 Hexagonal Nut M14*1.5, and the various Washers – are supplied in the correct quantities and grades. This eliminates the guesswork and ensures that every connection is torqued to factory specifications.
Our Rear Air Suspension Shock Absorber is fully compatible with all Sitrak C7H variants, including 4×2, 6×4, and 6×2 configurations. Whether your truck is used for long-haul logistics, heavy construction, or regional distribution, this shock absorber provides the durability and damping consistency required for professional operations. It is also backward-compatible with earlier C7H model years.
In addition to the shock absorber itself, the supporting components – such as the Spacer Plate, Pin, and the various Bolts and Nuts – are all precision-engineered to the highest standards. The Spacer Plate, for instance, is laser-cut and deburred to ensure a burr-free surface that won’t damage the shock absorber’s mounting eye. The Pin is induction-hardened to resist bending under lateral loads.
We understand that downtime is costly for fleet operators. That is why we maintain a ready stock of the Rear Air Suspension Shock Absorber and all related hardware. Our logistics network ensures rapid dispatch, so you can get your Sitrak C7H back on the road with minimal delay. Each unit is individually tested for damping force and leak integrity before leaving our facility.
The Rear Air Suspension Shock Absorber also contributes to fuel efficiency by maintaining optimal tire contact with the road. Reduced bounce and wheel hop translate to lower rolling resistance, which can improve fuel consumption by up to 2% in highway driving conditions. This makes the shock absorber not just a safety and comfort component, but also a cost-saving investment over the long term.
For operators who prioritize driver comfort, the Rear Air Suspension Shock Absorber is indispensable. It isolates the cabin from road-induced vibrations, reducing driver fatigue during long shifts. A comfortable driver is a more alert and productive driver, which directly impacts operational efficiency and safety records. Our shock absorber is designed with this human factor in mind.
Finally, every Rear Air Suspension Shock Absorber we supply comes with a comprehensive warranty that covers manufacturing defects and premature wear. Our technical support team is available to assist with installation queries and troubleshooting. By choosing our product, you are not just buying a part – you are investing in the long-term reliability of your Sitrak C7H.
The Rear Air Suspension Shock Absorber is a critical safety component that should never be overlooked during routine maintenance. A failing shock absorber can increase stopping distances, reduce steering response, and cause uneven tire wear. Our product meets or exceeds all relevant ECE and DOT standards, giving you peace of mind on every journey.
We continuously update our manufacturing processes to incorporate the latest advancements in damping technology. The result is a Rear Air Suspension Shock Absorber that offers superior fade resistance, even during prolonged use on winding mountain roads or in stop-and-go urban traffic. This consistency is what sets our product apart from generic aftermarket alternatives.
In summary, the Rear Air Suspension Shock Absorber for the Sitrak C7H is more than just a spare part – it is a precision instrument that affects every aspect of the vehicle’s dynamic behavior. From load stability to driver comfort, from fuel economy to component longevity, this shock absorber plays a central role. Choose our genuine component to maintain the performance and reliability that Sitrak trucks are known for.
Our commitment to quality extends to every item in the hardware kit, including the Type 2 Hexagonal Nut M16*1.5 and Type 2 Hexagonal Nut M18*1.5. These nuts are cold-formed and thread-rolled for exceptional strength and consistency. The Washers are all deburred and plated to prevent galvanic corrosion, ensuring that every fastener remains serviceable even after years of exposure.
The Pin, another critical element, is manufactured from chrome-molybdenum alloy steel and heat-treated to achieve a tensile strength of over 1,000 MPa. This ensures that the pivot joint remains secure and free from play, even under the most demanding load cycles. Every Pin is dimensionally inspected to guarantee a precise fit with the shock absorber’s bushing.
We also offer bulk pricing and customized packaging for fleet customers who require regular replenishment of the Rear Air Suspension Shock Absorber. Our sales team can work with you to establish a consignment stock arrangement, ensuring that you never run out of critical components during peak operating seasons. Contact us via the buttons above to discuss your specific needs.
Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.
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