How To Match The Tractor Head With A Dump Trailer Without Overloading

Overseas infrastructure and mining transportation often encounter problems such as mismatched load capacity between the front of the vehicle and the dump trailer, fines for overloading on the road, and premature damage to vehicle components. Many overseas vehicle fleets only focus on the cargo volume when purchasing, ignoring the standards for matching the vehicle's axle load and traction capacity. They not only face high penalties from various countries' road administration, but also accelerate the wear and tear of tires, suspension, and braking systems, significantly increasing long-term operating costs. This article explains the compliance matching method between the front of the vehicle and the dump trailer from three aspects: selection, loading, and axle load distribution.
The first step in selecting a combination is to verify the official total towing weight of the tractor and the approved load capacity of the trailer. The mainstream 6 × 4 Shaanxi Automobile and HOWO tractor trailers are divided into different horsepower and traction levels. The weight of large capacity four axle dump trailers is generally between 12-15 tons. When matching, the formula must be followed: allowable cargo weight=maximum total weight of the vehicle - tractor weight - trailer empty weight. For example, the compliant total weight of a 6-axle train is 49 tons, the self weight of the tractor is about 9 tons, and the self weight of the four axle dump trailer is 14 tons. The upper limit of a single compliant cargo load is only 26 tons. If the cargo volume is blindly increased, it is very easy to encounter situations such as book load and actual overload. At the same time, according to the working conditions, the power is matched. For heavy-duty transportation in mountainous mining areas, priority is given to towing the locomotive with a power of 430 horsepower or more to ensure sufficient power for full load climbing and avoid brake heat degradation caused by dragging the heavy-duty trailer with a low horsepower locomotive.
Secondly, match the axle and tire load-bearing specifications to unify the overall vehicle load-bearing standards. Some customers choose a three axle lightweight front with a four axle heavy-duty dump trailer to increase loading capacity. The upper limit of the front drive axle and steering axle load is insufficient, and the axle load of the front axle and drive axle exceeds the standard after full load. When matching, it is necessary to ensure that the single axle load capacity of the trailer matches the front axle. For heavy-duty conditions of dump trailers, higher level heavy-duty vacuum tires should be selected, and the total load capacity of the tires should cover the full load weight of the vehicle; The steel plate spring and suspension bearing capacity are aligned synchronously to prevent long-term overload from causing deformation of the main beam and fracture of the leaf spring. Exporting to the South American and African markets requires prior confirmation of the local road axle load limit. In Colombia and many West African countries, strict axle load control is implemented on rural roads, and exceeding the limit will result in direct vehicle fines.
When loading materials, ensure balanced weight distribution to avoid local overloading. Self dumping trailers transport sand, gravel, red soil, and slag, and heavy objects should be placed in the middle of the compartment as much as possible to avoid material accumulation at the head or tail of the compartment. Overloading the trunk will increase the pressure on the traction saddle, causing damage to the front and rear axles; If the rear of the car is too heavy, it will cause insufficient force on the steering axle, resulting in drifting during high-speed and downhill driving, which can pose a safety hazard. During the rainy season in Africa, wet clay has a greater self weight and cannot be estimated solely based on its volume. If conditions permit, it can be weighed and the tonnage of a single load must be strictly controlled.
Suggestions for foreign trade procurement support: The complete set of locomotive heads and dump trailers can be customized according to the volume of the transported materials. The manufacturer will match the load-bearing configuration uniformly according to local weight limit standards and provide a complete vehicle matching and testing instruction. The complete set of matching vehicles not only avoids the risk of overloading, but also has better coordination between braking and hydraulic lifting systems, reducing overseas maintenance frequency. At the same time, the weight parameters of customs clearance documents are unified, reducing the problem of port inspection obstruction. It is a safe choice for overseas engineering fleets to reduce costs and increase efficiency.