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------- Before everything: what is an overweight load tractor?
An overweight load tractor (also called an overweight hauling tractor or heavy-haul truck tractor) is a heavy-duty semi-truck designed to pull overweight and oversized loads that exceed standard legal weight limits. These tractors are built with reinforced components to handle extreme weights and often work in conjunction with specialized trailers (like lowboys, multi-axle trailers, or modular platforms).
Typically 500-700+ HP (e.g., Cummins X15, Detroit Diesel DD16) to handle heavy loads on steep grades.
Often 18-speed manual or automated manual transmissions (AMTs) for precise control under heavy loads.
Thicker frame rails and air or hydraulic suspension to support extra weight without bending or breaking.
Tridem (3 axles) or quad-axle configurations for better weight distribution and traction.
Some use 8x6 or 10x8 drivetrains (meaning 8 or 10 total wheels with 6 or 8 being driven).
Fifth wheel rated for 50,000+ lbs or gooseneck setups for extreme loads.
Some use booster trucks (pusher/puller tractors) for extra power.
Jacobs engine brakes + disc brakes to safely stop massive loads.
Some have retarder systems for downhill control.
Oversize/overweight permits are required (varies by state/country).
Often equipped with flashing lights, flags, and escort vehicle coordination.
| Reference Pictures for Shacman 300Tons Overweight Tractor |
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------ What are the advantages of Shacman 8x8 300Tons Overweight Load Tractor?
The Shacman 8×8 300-ton oversize/overweight load tractor truck is a heavy-duty powerhouse designed for extreme hauling in mining, construction, and heavy industries. Here are its key advantages:
8×8 Drivetrain - All-wheel drive with 8 powered wheels ensures superior traction and weight distribution.
High GVWR - Can handle 300+ metric tons (with appropriate trailers), making it ideal for mining dump trucks, cranes, and industrial modules.
Multi-Axle Support - Often paired with 10+ axle heavy-duty lowboy trailers for legal weight distribution.
Cummings M15NS6B660 Diesel Engine - 660 HP and 3,200 Nm torque, optimized for steep grades and heavy loads.
High Fuel Efficiency - Advanced turbocharging and combustion tech reduce operating costs.
Durable Cooling System - Prevents overheating during long hauls in harsh conditions (e.g., deserts, mines).
3. Allison Transmission+Torque Converter+Transmission Retarder
2-3x Torque Multiplication: Helps heavy vehicles (e.g., 200-ton haulers) accelerate effortlessly, even on steep grades.
High Retarding Power: Provides up to 600+ hp of braking force, minimizing service brake use.
Downhill Speed Control: Maintains safe speeds without overheating brakes (critical for mountainous routes).
Reinforced Steel Frame - Resists bending under extreme stress.
Hydraulic/Pneumatic Suspension - Adjustable for load balancing and rough terrain.
Multi-Axle Steering - Improves maneuverability for tight turns (critical in construction sites).
Central Tire Inflation System (CTIS) - Adjusts tire pressure on-the-fly for sand, mud, or rocky terrain.
Locking Differentials - Prevents wheel spin when hauling uphill or on slippery surfaces.
High Ground Clearance - Minimizes undercarriage damage on unpaved roads.
ABS + EBS Braking - Ensures control when stopping heavy loads.
Overload Alarms - Warns drivers if weight exceeds permit limits.
LED Lighting & Reflectors - Meets oversize load visibility regulations.
Lower Price - Compared to Western brands (e.g., Kenworth C500, Mercedes Zetros), Shacman offers better value for heavy haulers around the globe.
Local Support - Easier access to parts/service in China and BRI (Belt & Road) countries.
| Model Designation | Heavy Transport Tractor |
| Announcement Model | / (Not specified) |
| Drive Configuration | 8×8 |
| Dimensions (L×W×H, mm) | 8850 × 2850 × 4000 |
| Wheelbase (mm) | 1800 + 3000 + 1450 |
| Fifth Wheel Height (Unladen/Laden, mm) | 1700 ± 30 |
| Front Overhang (mm) | 1725 |
| Rear Overhang (mm) | 875 |
| Front Swing Radius (mm) | 2350 |
| Rear Swing Radius (mm) | 2240 |
| Minimum Turning Radius (m) | 13 |
| Max Speed (km/h) | 89 |
| Max Gradability (300T Load) | 12% |
| Ground Clearance (mm) | 340 |
| Curb Weight (kg) | > 19,000 |
| Max Towing Capacity (kg) | 300,000 |
| Engine Model | Cummins M15NS6B660 (Euro VI, 660 HP) |
| Displacement (L) | 14.5 |
| Rated Power/RPM | 486 kW @ 100 rpm |
| Max Torque/RPM | 3200 Nm @ 900-1400 rpm |
| Transmission Model | Allison 4970SP-PR with Torque Converter |
| Transmission Max Input Torque (N·m) | 19,029.9 (1st gear, torque converter stall) |
| Torque Ratio | 1.62 |
| Gear Ratios | 4.7, 3.3, 2.21, 1.53, 1.0, 0.76, 0.67, R-5.55 |
| Retarder | Integrated Allison Output Retarder |
| Clutch | Multi-plate Wet Clutch (Integrated) |
| Transfer Case Model | Domestic ZQC2800 |
| Transfer Case Gear Ratios (High/Low) | 1.11 / 2.37 |
| Transfer Case Max Input Torque/RPM | 35,000 N·m @ 2950 rpm |
| Torque Split Ratio | 1:2.13 |
| Axle Ratio | 6.733 |
| Axle Capacity | Front: Sinotruk-Handt 9T MAN-tech Steering Drive Axle (Dual) Rear: 16T MAN-tech Tandem Double-Reduction Drive Axle (Dual) |
| Max Input Torque (Front/Middle Axle) | 5490 N·m / 9320 N·m |
| Max Input Torque (Middle/Rear Axle) | 21,580 N·m / 17,410 N·m |
| Tires | 14.00R20 20PR Tubed Off-Road Tread (20-Ply) |
| Suspension | Front/Rear: Leaf Spring Balanced Suspension (Front with Hydraulic Shock Absorbers) |
| Steering System | ZF8098 Steering Gear (Imported) + Auxiliary Hydraulic Cylinder |
| Braking System | Dual-Circuit Pneumatic Brakes + Jacobs Engine Brake + Retarder Front/Rear: Combined Brake Chambers + Trailer Brake Interface (3 Ports) Dual-Cartridge Air Dryer + 6-Channel ABS (Domestic) |
| Fuel Tank | 900L + 400L Parallel Tanks (Electronically Controlled Switching) |
| Air Intake/Exhaust & Aftertreatment | Direct-Flow Air Filter "U"-Type Euro VI Aftertreatment (Underbody Exhaust) |
| Fifth Wheel | Reinforced 90mm Dual-Pivot Fifth Wheel |
| Battery | 2 × 12V, 220Ah Low-Temperature Maintenance-Free |
| HVAC | Auto Climate Control + Fuel-Powered Heater + Independent Auxiliary Heater |
| Cab | X5000L Extended High-Roof Cab (Wide Berth, Side Deflectors) + 4-Point Air Suspension |
| Cooling System | Front Main Radiator + Side Auxiliary Radiator (Series Connection) Temperature-Controlled Fan Engagement |
| Frame | Heavy-Duty Reinforced Frame (970mm-850mm Variable Width) 10mm + 8mm Thick × 300mm Height (C-Section Main/Sub Beams + Triple-Layer Local Reinforcement) |
| Towing Hooks | Heavy-Duty Front/Rear Tow Hooks (70mm Pin Diameter) |
| Exterior Accessories | Toolbox + Left Side Access Ladder + Operating Platform Integrated Arc Mudguards (Middle Axle) + Full Metal Mudguards (Rear Axles) |
| Electrical System | 24V, Negative Ground |
| Drive Shaft | Cross-Type Universal Joint, 180mm Face Gear Flange |
------ Why choose us?
Chengli Group (CLW Group) is a leading Chinese manufacturer of specialized vehicles. In 2023, CLW Group reported over 1.4 billion USD for annual revenue, with over 50,000 units sold, at least 20% of which is for overseas market. Here are our key advantages:
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