The 4268-20085 transmission shaft is not merely a replacement part; it is a precision-engineered solution for HOWO and Sitrak trucks. Manufactured from high-strength alloy steel, it withstands torsional stress and fatigue, ensuring that every horsepower reaches the wheels efficiently.
Every 4268-20085 shaft undergoes rigorous dynamic balancing and magnetic particle inspection. This ensures zero porosity and micro-cracks, delivering the dependability that HOWO owners expect. Whether you operate in mining, construction, or long-haul logistics, this shaft reduces drivetrain losses and improves fuel economy.
| Parameter | Value / specification |
|---|---|
| OEM number | 4268-20085 |
| Length (mm) | 1520 |
| Outer diameter | 89 mm |
| Spline teeth | 36 (involute) |
| Material | 42CrMo4 alloy |
| Weight (kg) | 28.5 |
| Max. dynamic torque | 11,800 Nm |
| Compatible models | HOWO A7, T7H, Sitrak C7H |
The 4268-20085 transmission shaft integrates decades of Sinotruk’s driveline expertise. Its unique heat-treatment process – induction hardening followed by tempering – creates a surface hardness of 58–62 HRC while retaining a tough core. This dual-phase structure resists wear from spline fretting and bending fatigue, common failure modes in heavy trucks.
Advanced CNC machining ensures that the 4268-20085 shaft’s universal joint yokes and center bearing journals maintain concentricity within 0.02 mm. Such precision minimizes runout, which directly reduces U-joint wear and extends the life of associated components like the differential and gearbox. Fleet operators report up to 18% longer drivetrain service life after switching to this genuine HOWO part.
In real-world conditions, the 4268-20085 demonstrates exceptional resistance to shock loads. The spline coupling, coated with anti-friction manganese phosphate, prevents galling even during aggressive gear changes. Additionally, the shaft’s hollow design – while maintaining strength – reduces rotating mass, improving throttle response and decreasing fuel consumption by 2.7% in highway tests.
For Sitrak C7H and HOWO T7H models, the 4268-20085 offers a direct fit without modifications. Its flanges match the original bolt pattern, and the dust shield design keeps contaminants away from the slip joint. The shaft also features a built-in vibration damper that neutralizes harmonic resonances at typical cruising RPM ranges (1,200–1,600 rpm).
Maintenance is simplified with the 4268-20085: the greaseable universal joints are positioned for easy access, and the wear indicators on the spline allow quick visual checks. Operators can expect a service life exceeding 300,000 km under standard conditions, making it a cost-effective choice for fleets that prioritize uptime.
Each 4268-20085 shaft undergoes a 12-step quality control process, including ultrasonic flaw detection and dynamic balancing to ISO 1940 grade G2.5. This ensures that vibration levels remain below 3.5 mm/s, a critical factor for driver comfort and component longevity. The shaft’s corrosion-resistant coating (zinc-nickel + clear chromate) surpasses 720 hours of salt spray testing, making it ideal for harsh environments.
Compatibility extends beyond HOWO and Sitrak: the 4268-20085 also fits selected Sinotruk models with similar driveline configurations. Its universal spline dimensions (36 teeth, 40/50 mm pitch diameter) match common heavy-duty applications, although we recommend verifying the original part number. The shaft is delivered with pre-installed grease fittings and a protective sleeve to safeguard splines during storage.
Compared to aftermarket alternatives, the 4268-20085 offers superior weld integrity – every weld seam is X-ray inspected and meets AWS D1.1 standards. This eliminates the risk of weld separation under peak torque, a notorious issue with lower-quality shafts. Furthermore, the use of premium SKF or NTN bearings in the center support enhances radial stiffness, reducing deflection by 40% compared to generic units.
For operators using auxiliary transmissions or PTOs, the 4268-20085’s torsional stiffness (15.2 kN·m/rad) ensures that power take-off operations remain smooth. The shaft’s design also accommodates short-term overloads up to 15% without permanent deformation, providing an extra margin of safety during emergency maneuvers or heavy towing.
To summarize, the transmission shaft represents the optimal choice for HOWO and Sitrak owners who refuse to compromise on quality. Its robust metallurgy, precision balancing, and rigorous testing ensure that your truck delivers peak performance mile after mile. Whether you are replacing a worn shaft or upgrading your driveline, this component offers the durability and efficiency that modern logistics demand. Choose genuine Howo/Sitrak truck parts and experience the difference that original engineering makes.
The 4268-20085 is stocked in regional warehouses for rapid dispatch. Cross-reference your existing part to confirm compatibility – our team ensures that every shaft meets the strictest quality benchmarks.
Installing the is straightforward: clean the mating surfaces, apply recommended thread locker to the flange bolts, and torque to 480 N·m in a cross pattern. Grease the splines and U-joints with lithium complex grease before assembly. Regular inspection every 25,000 km – check for unusual play or grease leaks – will maximize the shaft’s service life.
When replacing, always inspect the companion flanges and center bearing bracket for wear. The 4268-20085’s precision-ground journal ensures a perfect fit with new or existing bearings. For fleets, stocking this part minimizes downtime, as it is a common failure point in high-mileage trucks. Many operators report that the 4268-20085 outlasts two sets of U-joints, proving its superior build.
Additionally, the shaft is compatible with both manual and automated manual transmissions (AMT) from Sinotruk. Its inertia-matched design reduces synchro wear, particularly in stop-and-go traffic. Environmental benefits are also notable: reduced driveline losses contribute to lower CO2 emissions per ton-kilometer, aligning with sustainability goals.
Finally, the comes with a 12-month unlimited-mileage warranty against manufacturing defects. This confidence reflects the rigorous testing and quality assurance embedded in every production batch. For heavy-duty operators, the is not just a spare part – it is a strategic investment in operational excellence.
We are a heavy-duty truck parts store. Please leave your contact information and inquiries. We will respond within 12 hours.
