Sinotruk 6x4 High Roof Tractor Truck
Truck Production
The HOWO 6x4 371HP high-roof tractor truck is a heavy-duty vehicle developed by SINOTRUK, designed for long-distance haulage and tough operating environments. Equipped with the powerful WD615.47 engine, it produces 371 horsepower, delivering dependable performance for transporting large loads across various terrains.
Its 6x4 axle layout means better traction and load distribution, ideal for both paved highways and rough rural roads. The truck features a manual HW19710 transmission with 10 forward gears, ensuring efficient power delivery and fuel economy. Built with a reinforced chassis, HF9 front axle, and dual HC16 rear axles, it can handle demanding transport tasks with stability and durability.
A major highlight is the high-roof HW79 cabin, designed for driver comfort during long journeys. It includes a double sleeper berth, extra headroom, and good insulation. Drivers benefit from adjustable ergonomic seats, air conditioning, and optional infotainment systems. The high-roof design enhances comfort, particularly on long hauls and overnight routes, making it ideal for logistics companies operating in remote or cross-border regions.
In Africa, the HOWO 371HP high-roof tractor truck is widely used in sectors such as freight logistics, mining, and construction. Its popularity is due to its low maintenance costs, affordable price, and readily available spare parts. The truck performs well under extreme weather and road conditions, with high ground clearance to handle uneven terrain.
Key specifications include a fuel tank capacity of 400L, payload capability up to 25–31 tons, and tire sizes of 12.00R20 or 12R22.5. Its performance, comfort, and cost-efficiency make it one of the most trusted choices for heavy transport operations across the African continent.
Parameter
| Item | Specification |
| Model | HOWO A7 / HOWO T7H (Varies by version) |
| Drive Type | 6x4 (Three axles, two driven) |
| Engine Model | WD615.47 (Euro II / Euro III compliant) |
| Engine Power | 371 HP (273 kW) |
| Engine Displacement | 9.726 L |
| Fuel Type | Diesel |
| Max Torque | ~1500–1600 Nm |
| Transmission | HW19710 (10-speed manual), optional HW19712 (12-speed) |
| Clutch | Single dry plate, Φ430 mm |
| Front Axle | HF9, rated at 9 tons |
| Rear Axle | HC16 double reduction axle, rated at 2×16 tons |
| Cabin | HW79 high-roof cabin, double sleeper, A/C included |
| Steering | ZF power steering, hydraulic with power assist |
| Fuel Tank Capacity | 400 liters |
| Tire Size | 12.00R20 or 12R22.5 (radial tires) |
| Braking System | Dual circuit air brake, ABS optional |
| Suspension | Leaf spring (front: 10; rear: 12 or 13) |
| Wheelbase | 3225 + 1350 mm |
| Overall Dimensions (L×W×H) | Approx. 6800 × 2500 × 3850 mm |
| Curb Weight | ~11,000–12,000 kg |
| GVW (Gross Vehicle Weight) | 25,000–31,000 kg |
| Max Speed | 102 km/h (electronically limited) |
| Fifth Wheel | 50# or 90# optional (suitable for 40–60 ton trailers) |
Rebuild Engine
Disassembling the engine allows for a full inspection and tailored maintenance planning.
Parts with over 20% wear are removed, separated from reusable ones, and new replacements are prepared.
Ultrasonic cleaning removes carbon buildup, oil residue, and scale, helping detect wear more clearly.
Cleaned components are sorted—usable ones are polished; worn parts are replaced with new ones.
The engine is reassembled following strict standards, with precise torque and clean, dust-free conditions.
The fuel pump is tested, calibrated for accuracy, and fine-tuned for consistent performance.
Load testing, data analysis, and leak checks ensure engine reliability under real conditions.
