Caterpillar Grader

Articulated Trucks

An Articulated dump truck has a hinge between the cab and the dump box, but is distinct from semi trailer trucks in that the cab is a permanent fixture, not a separable vehicle. Steering is accomplished via hydraulic rams that pivot the entire cab, rather than rack and pinion steering on the front axle. This vehicle is highly adaptable to rough terrain. In line with its use in rough terrain longer distances and overly flat surfaces tend to cause driveline troubles, and failures. Articulated trucks are often referred to as the modern scraper, in the sense that they carry a much higher maintenance burden than most trucks. See the first mass produced articulated dump truck articulated hauler.

An Articulated Off road dump trucks more closely resemble heavy construction equipment or engineering vehicles than they do highway dump trucks. They are used strictly off-road for mining and heavy dirt hauling jobs all over the world

The term ‘Dump’ Truck is not generally used by the mining industry, or by the manufacturers that build these machines. The more appropriate US term for this strictly off road vehicle is, Haul articuladet dump truck and the equivalent European term is ‘Dumper’. The classification bottom and side for example, describes how the loaded material is discharged once loaded. In the case of the Haul truck illustrated, a Liebherr T 282B the load is discharged to the rear, designating this particular vehicle as an end dump.

Bottom dump normally describes a trailer that discharges its load by opening two clam shell doors under the load space, in some examples several trailers (road train) are pulled by one truck mainly these are on road machines. The only remaining example of what is described as a unitized bottom dump coal hauler is manufactured by Kress Corporation. This large capacity truck is used for the transportation of coal from a loading device (shovel) directly to a power station or bulk storage area.

The current largest Articulated off road haul trucks are the Liebherr  and the Caterpillar 797B, which both have payloads of 400 short tons. Even though these trucks are similar in capacity the Caterpillar is referred to as a mechanical truck since it uses a big diesel engine(s, sometimes two) and big transmissions to power the rear wheels. The Liebherr is referred to as a Diesel-Electric Truck since it uses a diesel engine linked to an alternator that generates electricity which is converted to AC used to power two giant electric motors found on the rear wheel assemblies, similar to a locomotive (it is a series plug-in hybrid). Besides Liebherr and Caterpillar, Hitachi, Terex, Komatsu and others also fabricate such off road haul trucks in different capacities.

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