Overview
The Sinotruk HOWO 375 Tractor Truck is a classic heavy-duty truck from Sinotruk's renowned HOWO series, featuring a 6×4 drive configuration and powered by the WD615 series diesel engine delivering 375 horsepower. This model represents the more powerful variant within the HOWO family, offering higher torque output and improved gradeability compared to the 371 horsepower version, making it particularly suitable for heavy-load transportation and challenging road conditions.
The HOWO 375 Tractor Truck is widely used in long-haul logistics, port container transport, heavy machinery haulage, and mining/construction site operations. With its mature and reliable powertrain, high-capacity chassis structure, and economical maintenance costs, it enjoys strong market recognition in export markets such as Africa, Southeast Asia, the Middle East, and South America.
Important Note: The HOWO 375 model primarily features Euro 3/China III emission standard engines, which do not meet current domestic registration requirements in China. It is intended for export markets or domestic non-public road applications where registration is not required.
Key Features
| Feature | Description |
| 375HP Powerful Engine | Equipped with Sinotruk WD615.96/96E engine, delivering maximum output of 276kW (approx. 375HP) @ 2200rpm, with maximum torque ranging from 1500-1590N·m. Provides strong power output, particularly suitable for heavy-load starting and mountain climbing conditions. Compared to the 371HP version, the 375HP engine offers approximately 50-100N·m additional torque, delivering superior performance under heavy loads and on inclined roads. |
| 6×4 Drive Configuration | Features a dual rear drive axle design, offering greater load capacity and better adaptability to complex road conditions compared to 4×2 models. The dual drive axles provide increased traction, enhanced climbing capability, and improved handling stability during high-speed driving and cornering. |
| Proven WD615 Platform | Inline 6-cylinder engine with 9.726L displacement. This mature engine platform offers proven durability, high parts commonality, and relatively low maintenance costs. Features long B10 life and is supported by an established global service network and parts supply system. |
| Versatile Configuration Options | Multiple transmission options available (10-speed/12-speed/16-speed manual or AMT), various rear axle ratios (3.39-4.875), multiple tire specifications, and suspension types, allowing customized configurations based on specific operating conditions. |
| Driver Comfort Features | HW76 cab available in flat roof or high roof configurations. Features 4-point air suspension system, multi-adjustable driver's seat. Optional air conditioning and sleeper berth effectively reduce driver fatigue during long-haul operations. |
Specifications with Explanation
| Parameter | Specification | Explanation |
| Model Designation | ZZ4257N3247C1 / ZZ4257S3247CZ / Others | Official chassis model codes for 6×4 drive configuration tractors. Different configurations correspond to specific model designations. This series is positioned as heavy-duty tractors compliant with export market certification requirements. |
| Engine Model | WD615.96 / WD615.96E / WD615.96C | Inline 6-cylinder water-cooled turbocharged diesel engine. Displacement 9.726L, rated power 276kW (approx. 375HP) @ 2200rpm, maximum torque 1500-1590N·m @ 1100-1600rpm. Features low-speed high torque characteristics, ideal for heavy-load starting and climbing conditions. |
| Emission Standard | Euro 3 / China III | Compliant with Euro 3/China III emission standards. These emission standard vehicles cannot be registered for public road use in China and are intended for export markets only. |
| Transmission | HW13710L / HW18710 / HW20716A / HW14710 | Available with 10-speed, 12-speed, or 16-speed transmissions, including manual and AMT (automated manual transmission) options. Twin-countershaft design provides high load capacity. 16-speed transmissions offer more gear ratios for better adaptation to various operating conditions. |
| Drive Configuration | 6×4 | Three-axle layout with single front steering axle and dual rear drive axles. The dual rear drive axles distribute greater load, reducing stress on each axle while providing enhanced traction and stability. |
| Drive Axle | HW12 Single Reduction / Tandem Dual Axle | Available with single reduction axle or hub reduction axle. Rear axle permissible load 18,000kg, with selectable gear ratios including 3.39, 3.93, 4.22, 4.42, 4.875, etc., allowing configuration selection based on transport conditions. |
| Frame | MAN Technology Single-Layer Frame / High-Strength Ladder Frame | High-strength alloy steel ladder frame with section height 280mm. Some configurations feature 8+8mm double-layer design for enhanced torsional strength and load capacity. |
| Suspension System | Leaf Spring / Parabolic Leaf Spring / Air Suspension | Front axle uses parabolic leaf springs (9 leaves) with hydraulic shock absorbers. Rear axle options include multi-leaf springs, parabolic leaf springs, or air suspension. Air suspension supports ECAS electronic lifting for convenient trailer swapping operations. |
| Tire Specifications | 12.00R20 / 315/80R22.5 / 11.00R20 / 425/65R22.5 | Steel-belted radial tires or tubeless tires available. Steel-belted tires offer high wear resistance for harsh conditions; tubeless tires provide lower rolling resistance for highway use. Number of tires varies from 6 to 10 depending on configuration. |
| Fuel Tank Capacity | 400L (Aluminum) | 400L aluminum fuel tank ensures long-range endurance. Larger capacity options available for certain configurations. |
| Vehicle Weight | 7.4 - 9.21 tons | Weight varies by configuration. 6×2 models have lower curb weight (approx. 7.4-8.54 tons), while 6×4 models weigh approximately 8.8-9.21 tons. |
| Gross Trailer Weight | 37.3 - 40 tons | Maximum towing capacity ranges from 37.3-40 tons depending on configuration. 6×4 models typically achieve 40 tons towing capacity. |
| Dimensions (L×W×H) | Approx. 6900×2500×2950-3470 mm | Length approximately 6.8-6.91 meters, width approximately 2.5 meters, height varies between 2.95-3.47 meters based on cab configuration. |
| Cab | HW76 Flat Roof / High Roof | 4-point air suspension system, air-suspended driver's seat. High roof cab option provides more spacious interior and sleeper berth configuration. |
Applications
| Application | Suitability |
| Long-Haul Logistics | 375HP power output provides ample power reserve for highway cruising under full load conditions. Combined with 400L fuel tank and comfortable sleeper cab, suitable for cross-regional long-haul freight operations. Recommended configuration: small gear ratio rear axle (3.39-4.22) + overdrive transmission + tubeless tires. |
| Port Container Transport | 6×4 drive configuration and robust chassis structure handle frequent stop-start port operations efficiently. Right-hand drive option available to meet traffic regulations in Southeast Asia, Africa, and other markets. Strong starting capability easily handles heavy container hauling requirements. |
| Heavy Machinery Haulage | 375HP version provides higher torque output (up to 1590N·m) compared to the 371 version. Combined with large gear ratio rear axle (4.8-5.73) and direct-drive transmission, delivers powerful tractive capacity suitable for transporting excavators, bulldozers, and other heavy construction machinery. |
| Mining/Construction Site Transport | Heavy-duty suspension, steel-belted tires (12.00R20), and durable chassis components enable this model to handle demanding conditions of mines, construction sites, and unpaved roads. Multi-leaf spring suspension provides higher load capacity. |
| Bulk Cargo Transfer | Reliable powertrain and mature chassis technology suit medium-to-short-haul transport of coal, sand, steel, and other bulk materials. Optional larger fuel tank extends range. |
Comparison Table
| Configuration | Standard (Logistics Version) | Heavy-Duty (Construction/Mining Version) |
| Engine | WD615.96 / WD615.96E (375HP) | WD615.96C (375-380HP) |
| Emission Standard | Euro 3 | Euro 3 |
| Transmission | HW13710L (10-speed manual) / HW18710 (10-speed AMT) | HW20716A (16-speed AMT) / HW14710 (10-speed manual) |
| Rear Axle Ratio | 3.39 - 4.22 (Highway ratio) | 4.42 - 4.875 (Heavy-duty ratio) |
| Tires | 315/80R22.5 (Tubeless) / 425/65R22.5 | 12.00R20 (Steel-belted with inner tube) / 11.00R20 |
| Suspension | Parabolic leaf springs / Air suspension (Better comfort) | Multi-leaf springs (Higher load capacity) |
| Frame | Single-layer frame | Double-layer reinforced frame |
| Fuel Tank | 400L Aluminum | 400L Aluminum (Larger capacity optional) |
| Cab | HW76 High Roof / Flat Roof (Sleeper optional) | HW76 Flat Roof (Sleeper optional on some configurations) |
| Recommended Use | Long-haul standard load logistics, express delivery, port transport | Short-haul heavy loads, mining/construction site transport, heavy machinery haulage |
*Note: 6×2 drive configuration models have lighter curb weight (approx. 7.4-8.54 tons) with gross trailer weight of approximately 37.3-38.4 tons, suitable for logistics applications sensitive to vehicle weight.*
Buying Guide
1. Select Configuration Based on Operating Conditions
| Condition Type | Recommended Configuration | Explanation |
| Highway Standard Load Transport | Small gear ratio rear axle (3.39-4.22) + Overdrive/AMT transmission + Tubeless tires | Optimizes fuel economy, suitable for long-haul logistics. 6×2 models offer lighter curb weight, increasing payload per trip. |
| Mountain/Heavy Load Transport | Large gear ratio rear axle (4.42-4.875) + Direct-drive transmission + Steel-belted tires + Multi-leaf springs | Improves starting torque and climbing capability, suitable for inclined roads or heavy-load conditions. |
| Mining/Construction Rough Terrain | Large gear ratio rear axle + 12.00R20 steel-belted tires + Double-layer reinforced frame + Multi-leaf springs | Enhances durability and impact resistance, suitable for unpaved road conditions. |
| Port/Container Transport | Standard gear ratio + Manual transmission + Optional right-hand drive | Suited for frequent stop-start operations. Right-hand drive option meets regulatory requirements in specific markets. |
2. Cab Selection
Long-Haul Transport: Recommended to choose high roof cab with sleeper berth and air conditioning to ensure driver rest quality.
Short-Haul/Yard Operations: Choose flat roof cab to reduce overall vehicle height and wind resistance, suitable for height-restricted areas.
3. Emission Standard Confirmation
HOWO 375 models primarily feature Euro 3/China III emission standard engines.
Important Note: Vehicles with these emission standards do not meet domestic registration requirements in China and are intended for export markets or domestic non-public road applications.
Confirm destination country environmental policies before purchase.
4. Transmission Type Selection
| Transmission Type | Features | Suitable Applications |
| Manual Transmission (10/12-speed) | Simple structure, low maintenance cost, direct driver control | Traditional logistics, heavy-load transport, suitable for experienced drivers |
| AMT (10/16-speed) | Reduces driver workload, smooth shifting, improved fuel economy | Long-haul logistics, users prioritizing driving comfort |
5. New vs. Used Vehicle Purchasing Considerations
The HOWO 375 model has high market volume and good resale value. When purchasing used vehicles, it is recommended to inspect:
Engine: Starting condition, idle stability, exhaust smoke color, unusual noises
Transmission: Shift smoothness, signs of gear disengagement
Rear Axle: Gear clearance, driving noise, differential lock functionality
Frame: Deformation, signs of welding repairs
Tires: Wear pattern uniformity, manufacturing date
Maintenance Records: Verify service history and operating conditions
6. Export Purchase Special Considerations
HOWO 375 is a popular export model with established sales and after-sales service networks in Africa, Southeast Asia, the Middle East, South America, and other markets.
Confirm destination country driving position requirements (left-hand drive/right-hand drive).
Understand destination country certification requirements (e.g., GCC, SONCAP, EAC, etc.).
Confirm packaging and shipping methods (container, RoRo, bulk vessel, etc.).
Delivery & Certification
Delivery Information
| Delivery Type | Details |
| Domestic Delivery | Typically ready for pickup within 7-30 business days after order confirmation. Self-pickup or logistics delivery available. |
| Export Delivery | FOB (Qingdao Port, Shanghai Port, Tianjin Port, etc.) or CIF terms supported. |
| Packaging Methods | Anti-corrosion and moisture-proof treatment according to marine standards. Packaging options include: container, bulk vessel, flat rack, RoRo (roll-on/roll-off). |
| Export Documentation | Complete export documentation provided, including commercial invoice, packing list, bill of lading, vehicle certificate of conformity, etc. |
Certifications
| Certification Type | Details |
| Domestic Certification | CCC (China Compulsory Certification) compliant. |
| International Certification Support | Certification support available based on destination country requirements, including but not limited to:
- GCC Certification (Gulf Countries)
- SONCAP Certification (Nigeria and select African countries)
- EAC Certification (Eurasian Economic Union)
- ISO 9001 Quality Management System Certification |
