Engine smoothness and durability depend heavily on the precise control of internal vibrations, and the balance shaft assembly is at the heart of this critical function. The WG9525525030 2 Balance Shaft Assembly from HOWO is engineered to deliver exceptional vibration damping, reduced engine noise, and extended component life, ensuring that your powertrain operates with the smoothness and reliability that professional drivers demand. As a vital Howo/Sitrak truck parts solution, this balance shaft assembly is precision-forged from high-strength alloy steel, dynamically balanced to exacting tolerances, and finished with a durable anti-corrosion coating. Its advanced design effectively counters the secondary forces generated by the engine’s reciprocating mass, minimising wear on bearings and crankshaft components. Whether you are rebuilding an engine or replacing a worn assembly, the WG9525525030 2 guarantees factory-original balance, superior vibration control, and lasting reliability – making it the definitive choice for professional workshops and fleet operators worldwide.
The balance shaft assembly is a critical component that counteracts the inherent vibrations of inline engines, particularly those with long stroke designs. The WG9525525030 2 is specifically engineered to reduce the secondary shaking forces that can cause fatigue to the engine block, crankshaft, and bearings over time. HOWO has designed this assembly with optimised counterweights that precisely mirror the reciprocating mass of the pistons and connecting rods, effectively cancelling out vibrations before they can affect the vehicle’s comfort or longevity. The result is a noticeably smoother idle, reduced cabin noise, and significantly lower stress on the engine’s moving parts, translating to a longer service life and improved reliability. With the WG9525525030 2, you ensure that your engine runs as smoothly and quietly as the day it left the factory.
Precision Balance
Zero Vibration
Quiet Operation
Reduced Noise
OEM Grade
Genuine HOWO
Durable
Anti‑Corrosion
Accurate engineering data ensures correct application and installation. The WG9525525030 2 is manufactured to the highest OEM standards, guaranteeing a seamless replacement for your HOWO engine’s balance shaft system.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | WG9525525030 2 | Exact Match |
| Part Name | Balance Shaft Assembly | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / MC11/MC13 | Engine balance system |
| Material | Forged alloy steel (42CrMo) | High strength, heat‑treated |
| Shaft Diameter | 55 mm (bearing journal) | Precision ground |
| Overall Length | 420 mm | End‑to‑end |
| Balance Weight | Optimised counterweights | Dynamic balancing |
| Hardness (core) | 28–34 HRC | Toughness |
| Surface Hardness | 55–60 HRC (case) | Wear resistant |
| Bearing Type | Roller / journal (with bushings) | Low friction |
| Weight | 12.5 kg | Complete assembly |
| Warranty | 12 Months | Manufacturer Guarantee |
The WG9525525030 2 is manufactured using a multi‑stage process that begins with vacuum‑degassed alloy steel forging, ensuring a dense, porosity‑free structure. The forged blank is then annealed and rough‑machined before undergoing precise CNC grinding of the bearing journals and counterweight faces. The shaft is then dynamically balanced to within 1 gram‑millimeter at operational speeds, eliminating residual vibration that could lead to premature bearing wear.
The critical journals are induction‑hardened to achieve a wear‑resistant surface while maintaining a tough core that absorbs shock loads. The counterweights are machined to exact weight specifications to ensure perfect cancellation of secondary forces. The assembly includes high‑quality roller bearings or journal bushings, depending on the engine variant, all lubricated via the engine’s oil system. Each assembly is inspected for balance, concentricity, and dimensional accuracy using state‑of‑the‑art measuring equipment, guaranteeing that the WG9525525030 2 delivers the smooth, reliable performance that HOWO engines are known for.
The WG9525525030 2 is specifically designed for HOWO heavy‑duty trucks, including T7H, A7, and derivative models equipped with the MC11 or MC13 engine series. It directly replaces the original balance shaft assembly, with identical bearing journal sizes, counterweight profiles, and mounting configurations, ensuring a straightforward installation without modifications.
This balance shaft assembly is also compatible with many Sinotruk and other commercial vehicles that share the same engine architecture. To confirm fitment, always cross‑reference the OEM number on your existing assembly with WG9525525030 2. If they match, this component will integrate seamlessly. Keeping this assembly in your spare parts inventory enables rapid engine rebuilds, minimising downtime and preserving the smooth, vibration‑free operation that your drivers rely on.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
MC11/MC13
Engine Series
Direct Replacement
No Mods
Replacing a worn or improperly balanced shaft with the WG9525525030 2 yields an immediate improvement in engine refinement. The precision‑balanced assembly significantly reduces the vibration transmitted to the cab, resulting in a quieter, more comfortable driving environment. This reduction in vibration also lessens the fatigue on engine bearings, crankshaft, and cylinder block, extending the overall life of the engine by thousands of hours.
The robust construction and high‑quality materials ensure that the assembly maintains its balance characteristics even after extended service, reducing the risk of future imbalance‑related issues. For fleet operators, a smooth‑running engine means fewer drivetrain repairs, lower maintenance costs, and improved driver retention. By investing in the WG9525525030 2, you ensure that your HOWO truck continues to deliver the dependable, refined performance that sets it apart from the competition.
Installing the WG9525525030 2 Balance Shaft Assembly is a complex procedure best performed by an experienced engine technician. Begin by removing the engine from the vehicle and dismantling the lower end. Carefully extract the old balance shaft, noting the orientation and position of any thrust washers or shims.
Thoroughly clean the bearing bores and inspect the oil galleries for obstructions. Install new bearing shells and lubricate them with clean engine oil. Carefully insert the new balance shaft, ensuring that the timing marks align with the crankshaft gear. Install new thrust washers and adjust the end float to specification. Torque the bearing caps to the manufacturer’s setting and verify that the shaft rotates freely without binding. Reassemble the engine and refill with the correct oil. After initial startup, check for any unusual noise or vibration. With careful installation, the WG9525525030 2 will provide years of smooth, reliable operation.
Pro Tip: Always replace the balance shaft bearings and thrust washers when installing a new shaft. Old bearings may have worn unevenly, and new components ensure proper oil clearance and end‑float. The WG9525525030 2 is designed to work with fresh bearing sets for optimal performance.
Genuine HOWO components are engineered to the highest standards, and the WG9525525030 2 Balance Shaft Assembly is no exception. Aftermarket assemblies often use inferior steel, imprecise balancing, or incorrect counterweight geometry, leading to increased vibration, premature bearing failure, and reduced engine life. HOWO’s assembly is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance.
By choosing the WG9525525030 2, you benefit from HOWO’s rigorous testing, including dynamic balancing, fatigue, and wear testing. This ensures that the assembly meets the demanding requirements of heavy‑duty truck engines. 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 engines use the WG9525525030 2?
A: It is used in HOWO MC11 and MC13 engines, commonly found in T7H, A7, and other heavy‑duty trucks.
Q: What are the signs of a failing balance shaft assembly?
A: Increased engine vibration, especially at certain RPM ranges, a rough idle, and a noticeable increase in cabin noise are common indicators.
Q: Does the assembly come with bearings?
A: The WG9525525030 2 includes the shaft and counterweights. Bearings are typically sold separately. We recommend ordering genuine HOWO bearings for correct fit and clearance.
Q: How do I verify the correct part?
A: Check the OEM number stamped on your existing assembly. If it matches WG9525525030 2, this is the exact replacement. Consult your vehicle’s service manual for additional confirmation.
Order your WG9525525030 2 Balance Shaft Assembly today! Explore our complete selection of genuine HOWO and Sinotruk engine components at Howo/Sitrak truck parts and keep your engine running smoothly and quietly.
The WG9525525030 2 Balance Shaft Assembly from HOWO is a testament to precision engineering and unwavering quality. By choosing this genuine component, you ensure that your engine operates with the smoothness and refinement it was designed for, reducing vibration, noise, and wear on critical components. Whether you are a professional engine builder or a fleet manager, this assembly offers the balance, durability, and exact fit required for modern heavy‑duty truck engines. Trust HOWO – the benchmark for excellence in heavy‑duty truck components – and experience the difference that genuine quality makes.
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