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In the late 1930s the US Army began setting requirements for custom built tactical trucks, winning designs would be built in quantity. As demand increased during WWII some standardized designs were built by other manufactures. Most trucks had gasoline (G) engines until the early 1960s, when multifuel (M) and diesel (D) engines were introduced ...
By 1915, the US Army was using trucks tactically. When the US joined World War I in April, 1917 it began purchasing trucks in larger numbers. Early trucks were often designed for both military and commercial use, later military-specific designs were built. Since 1940 the US military has ordered over 3,000,000 tactical trucks.
The 140 hp engines were not reliable, suffering frequent headgasket failures. The first A2 trucks received the bigger LD-465-1 naturally aspirated 478 CID multifuel engines, keeping the OD transmission of the A1s. Through the years the trucks were upgraded to LD 465-1c engines, with 60Amp alternator instead of the 25Amp
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 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. In on-road service the load weight was doubled.
M939 series trucks – previous U.S. Army 5-ton truck; M809 series trucks - previous U.S. Army 5-ton truck (remained in use alongside successor M939 series) M35 series trucks – previous U.S. Army 2.5-ton truck; Oshkosh MTVR; Heavy Expanded Mobility Tactical Truck; Palletized load system; Logistics Vehicle System (LVS) Leyland 4-tonne truck ...
The engine was a successful design but by 1960 its 4 miles per US gallon (1.7 km/L) and the use of gasoline as a fuel in heavy trucks were becoming a problem. [ 2 ] [ 13 ] [ 14 ] In 1962–1963 Diamond T and Mack began retrofitting M52 semi-tractors and M54 cargo trucks to the -A1 standard.
The Heavy Expanded Mobility Tactical Truck (HEMTT) is an eight-wheel drive, diesel-powered, 10-short-ton (9,100 kg) tactical truck. [2] The M977 HEMTT first entered service in 1982 with the United States Army as a replacement for the M520 Goer, and since that date has remained in production for the U.S. Army and other nations.