very heavy truck

  • 1000.00 Rs.
  • Published date: August 7, 2016
    • Dasua, Dasua, Punjab, India

The most common tractor-cab layout has a forward engine, one steering axle, and two drive axles. The fifth-wheel trailer coupling on most tractor trucks is movable fore and aft, to allow adjustment in the weight distribution over its rear axle(s).


Ubiquitous in Europe, but less common in North America since the 1990s, is the cabover engine configuration, where the driver sits next to, or over the engine. With changes in the US to the maximum length of the combined vehicle, the cabover was largely phased out of North American over-the-road (long-haul) service by 2007. Cabovers were difficult to service, the cab could not be lifted on its hinges to a full 90-degree forward tilt, and this severely limited access to the front part of the engine.


Trucks average from 4 to 8 miles per US gallon (59 to 29 L/100 km), with fuel economy standards requiring more than 7 miles per US gallon (34 L/100 km) efficiency by 2014.[2]




 





Rocky Mountain Double





 





STAA double pup 28.5-foot trailers



The cargo trailer usually has a tandem axles at the rear, each of which has dual wheels, or eight tires on the trailer, four per axle. In the US it is common to refer to the number of wheel hubs, rather than the number of tires, an axle can have either single or dual tires with no legal difference.[3][4] The combination of eight tires on the trailer and ten tires on the tractor is what led to the moniker eighteen wheeler, although this term is considered by some truckers to be a misnomer (the term "eighteen-wheeler" is a nickname for a five-axle over-the-road combination). Many trailers are equipped with movable tandem axles to allow adjusting the weight distribution.

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