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The vehicle usually has all-wheel drive and consists of two basic units: the front section, generally called the tractor, and the rear section that contains the dump body, called the hauler or trailer section. Steering is made by pivoting the front in relation to the back by hydraulic rams.
In production since 1998, the 797 series represents Caterpillar’s largest, highest capacity haul trucks. [2] The current, third-generation model, the 797F, offers one of the largest haul truck payload capacities in the world, up to 400 short tons (363 t) and has the highest payload capacity among mechanical drive haul trucks.
Moxy built the first prototype dump truck in 1970. The first model was a heavy duty dump truck drawn by a powerful tractor with rear wheels driven by hydraulic motors. The next version, an articulated dump truck driven by a Scania diesel engine, D20, was also finished in 1970.
The WABCO 3200 was a rare example of a tri-axle haul truck configuration A medium sized haul truck, the 214-short-ton (194 t; 191-long-ton) Caterpillar 789 [1]. Most haul trucks have a two-axle design, but two well-known models from the 1970s, the 350T Terex Titan and 235T WABCO 3200/B, had three axles.
Normally there is a single undriven front axle on semi-elliptical leaf springs, but driven and tandem steer (popular in Canada) axles are available. The base rear suspension is a Mack tandem (two powered axles). Granites are also available with single and tridem (three driven) axles, different axle/suspension combination types.
The Bucyrus MT6300AC is an off-highway, ultra class, two-axle, diesel/AC electric powertrain haul truck designed and manufactured by Bucyrus International Inc. in the United States. The MT6300AC is Bucyrus' largest, highest payload capacity haul truck, offering one of the largest haul truck payload capacities in the world, up to 400 short tons ...
power-assisted with front and rear axle co-ordinated steer; twin pump (main and auxiliary) [2] The Oshkosh M1070 is a U.S. Army tractor unit . Defined as a Heavy Equipment Transporter, it was produced in A0, A1, and M1300 configurations, it replaced the earlier Oshkosh M911 tractor unit.
The M939 series uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). This allows a heavy load to be carried on improved roads and most US trucks in the past have used them. The M939A1 and M939A2 series instead use oversized 14:00 R20 tires with a single tire on each side per axle, still with a tandem setup.