The suspension system is the foundation of your truck’s ride quality and load‑carrying capability, and the left spring assembly is a critical component that directly influences stability and comfort. The WG9731523011 1 ST LEFT SPRING ASSY from HOWO is engineered to deliver exceptional load support, outstanding fatigue resistance, and a precise factory fit, ensuring that your vehicle maintains optimal ride height and handling characteristics under the most demanding conditions. As a vital Howo/Sitrak truck parts component, this left spring assembly is manufactured from high‑grade alloy steel, heat‑treated and shot‑peened for maximum strength and durability, and precision‑formed to match the original equipment specifications. Its multi‑leaf design provides progressive spring rates, absorbing road shocks while maintaining stability during cornering and braking. Whether you are replacing a sagging spring or performing a full suspension overhaul, the WG9731523011 1 guarantees a perfect OEM fit, consistent ride quality, and long‑lasting reliability – making it the preferred choice for professional workshops and fleet operators worldwide.
The left spring assembly bears a significant portion of the vehicle’s weight and is responsible for maintaining proper ride height and axle alignment. The WG9731523011 1 is specifically designed for the left side of the front or rear axle, providing the necessary spring rate to support heavy loads while absorbing road irregularities. Over time, springs can sag, crack, or lose their temper, resulting in uneven ride height, poor handling, and increased tyre wear. HOWO has engineered this spring assembly with a multi‑leaf configuration, using high‑carbon steel that is heat‑treated and shot‑peened to resist fatigue and stress corrosion. Each leaf is precisely tapered to provide a progressive spring rate, offering a smooth ride when lightly loaded and increased stiffness when heavily loaded. With the WG9731523011 1, you restore the original suspension geometry, improve load‑carrying performance, and enhance driver comfort.
High Load
Capacity
Progressive
Spring Rate
OEM Fit
Exact Match
Shot‑Peened
Fatigue Resistant
Precise engineering data ensures correct selection and installation. The WG9731523011 1 is manufactured to stringent OEM tolerances, guaranteeing seamless integration with your HOWO suspension system.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | WG9731523011 1 | Exact Match |
| Part Name | ST LEFT SPRING ASSY | Genuine HOWO |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / Front or Rear Axle (Left) | Suspension leaf spring |
| Material | High‑carbon alloy steel (SUP9) | Heat‑treated & shot‑peened |
| Number of Leaves | 9 (including main leaf) | Progressive rate |
| Spring Width | 76 mm | Standard |
| Spring Length (eye‑to‑eye) | 1350 mm | Under load |
| Load Rating (static) | 7500 kg | Per axle side |
| Surface Finish | Phosphated + epoxy paint | Corrosion resistant |
| Weight | 38.5 kg | Complete assembly |
| Warranty | 12 Months | Manufacturer Guarantee |
The WG9731523011 1 is produced using a rigorous manufacturing process that ensures consistent quality and performance. The spring steel is first heated and formed to the precise curvature, then subjected to a controlled heat‑treatment process that achieves the optimal balance of hardness and ductility. Each leaf is shot‑peened to induce compressive residual stresses on the surface, significantly improving fatigue life and resistance to crack propagation. The leaves are then assembled with precision‑ground centre bolts and rebound clips, ensuring that the pack remains aligned and functions as a single unit. The eye bushes are made from durable rubber or polyurethane, providing noise isolation and reducing wear on the mounting pins. The entire assembly is coated with a durable epoxy paint that resists rust and stone chips. Every spring is tested for load‑deflection characteristics and visual defects, guaranteeing that the WG9731523011 1 meets HOWO’s exacting standards. This engineering excellence translates into a spring assembly that delivers consistent ride quality, superior load support, and exceptional durability over the long haul.
The WG9731523011 1 is specifically designed for HOWO T7H and A7 trucks, as well as many Sinotruk models, for use on the left side of either the front or rear axle. It directly replaces the original spring assembly with identical dimensions, eye diameters, and mounting configurations, ensuring a straightforward bolt‑on installation without modifications. The spring is compatible with standard and heavy‑duty suspension systems, and it works with the original spring hangers and shackles.
To confirm fitment, always cross‑reference the OEM number on your existing spring with WG9731523011 1. If they match, this component will integrate seamlessly. Keeping this spring assembly in your spare parts inventory enables rapid suspension repairs, minimising downtime and restoring your vehicle’s load‑carrying capability and ride comfort.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
Left Side
Front/Rear Axle
Direct Replacement
No Mods
Replacing a sagging or broken left spring with the WG9731523011 1 immediately restores the original ride height and suspension geometry. This corrects any lean, improves axle alignment, and ensures even tyre wear. The progressive spring rate delivers a comfortable ride when the vehicle is lightly loaded and firms up to provide excellent stability when fully loaded, enhancing both driver comfort and vehicle control. The improved shock absorption also reduces stress on other suspension components, such as shocks, bushings, and axle mounts, extending their service life. For fleet operators, a reliable spring assembly reduces unscheduled repairs, improves payload stability, and contributes to overall safety. By investing in the WG9731523011 1, you ensure that your HOWO truck maintains the load‑carrying performance and ride quality it was designed for, mile after mile.
Installing the WG9731523011 1 Left Spring Assembly is a task best performed by a skilled technician with proper lifting equipment. Begin by safely supporting the vehicle and relieving the weight from the axle. Remove the old spring by disconnecting the shackle and hanger bolts, and carefully lower the spring from the vehicle. Thoroughly clean the mounting brackets and inspect the bushing surfaces for wear.
Install the new spring assembly using fresh U‑bolts and nuts, torquing them to the manufacturer’s specification. Ensure that the spring centre bolt aligns with the axle seat, and that the shackle pins are properly lubricated. After installation, lower the vehicle and check the ride height and suspension alignment. Periodically inspect the spring for any signs of damage or corrosion, and re‑torque the U‑bolts after the first few hundred kilometres. With proper installation and regular maintenance, the WG9731523011 1 will provide years of dependable service.
Pro Tip: When replacing the left spring assembly, it is highly recommended to replace the right‑side spring as well to maintain balanced suspension performance. The WG9731523011 1 is designed for the left side; order the corresponding right‑side spring separately for a complete set.
Genuine HOWO components are engineered to the highest standards, and the WG9731523011 1 Left Spring Assembly is no exception. Aftermarket springs often use inferior steel, inconsistent heat treatment, or inaccurate spring rates, leading to premature sagging, cracking, or poor ride quality. HOWO’s spring is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance.
By choosing the WG9731523011 1, you benefit from HOWO’s rigorous testing, including load‑deflection, fatigue, and corrosion tests. This ensures that the spring meets the demanding requirements of heavy‑duty trucking. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s global network, giving you confidence in your purchase.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which vehicles use the WG9731523011 1?
A: It is designed for HOWO T7H and A7 trucks, as well as many Sinotruk models, for the left side of the front or rear suspension.
Q: What are the signs of a failing left spring assembly?
A: Uneven ride height (vehicle leaning to one side), poor handling, excessive body roll, visible sagging or cracks in the spring leaves, and uneven tyre wear are common indicators.
Q: Is this a complete assembly?
A: Yes, the WG9731523011 1 includes all leaves, centre bolt, clips, and pre‑installed eye bushes – ready for installation.
Q: How do I verify the correct part?
A: Check the OEM number stamped on your existing spring. If it matches WG9731523011 1, this is the exact replacement. Consult your vehicle’s parts manual for additional confirmation.
Order your WG9731523011 1 Left Spring Assembly today! Explore our complete selection of genuine HOWO and Sinotruk suspension components at Howo/Sitrak truck parts and keep your truck riding level and securely supported.
The WG9731523011 1 Left Spring Assembly from HOWO is a testament to robust suspension engineering and uncompromising quality. By choosing this genuine component, you ensure that your truck maintains its original ride height, load‑carrying capability, and handling precision, protecting your cargo and enhancing driver comfort. Whether you are a professional mechanic or a fleet manager, this spring assembly offers the strength, durability, and exact fit required for modern heavy‑duty trucks. Trust HOWO – the benchmark for excellence in heavy‑duty truck components – and experience the difference that genuine quality makes.
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