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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.
Cummins NH250 engine Cummins 6CTA8.3 diesel engine M939 chassis with dual rear tires M939A1 and A2 have single rear tires. All models of the M939 share a common basic chassis, cab, hood, and fenders. The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck.
The M39 series had both single- and dual-rear-tire models; very few single-rear-tire trucks were built. Most models had 11.00×20s with dual rear tires; tractor wreckers had larger 12.00×20s. Bridge trucks and all M139 chassis-based trucks had 14.00×20s. [7] A standard military cab, designed by REO, was used. It had hinged doors with roll-up ...
M817 Dump truck. The M817 dump truck was used to haul sand, gravel, dirt, rubble, scrap, and other bulk materials. It had a 5 cubic yards (3.8 m 3) dump body with cab protector and a tailgate that could hinge at either the top or bottom. Normal loads are heavy by volume, the dump body was smaller and more heavily built than a cargo body.
A standard dump truck is a truck chassis with a dump body mounted to the frame. The bed is raised by a vertical hydraulic ram mounted under the front of the body (known as a front post hoist configuration), or a horizontal hydraulic ram and lever arrangement between the frame rails (known as an underbody hoist configuration), and the back of ...
Concrete pumps have a multi-stage folding boom pivoted near the center of the truck and a hopper at the rear to load the pump. The pump itself is the load and the truck always operates at maximum weight. In transit the boom is folded front to rear. In use the pump uses outriggers and the boom unfolds forward over the cab or to either side.