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Most engines have been water-cooled with inline (I) cylinders, but V types (V) and opposed (O) engines have also been used. Three air-cooled engines were used in two very light trucks. Gasoline engines up to WWII were often valve in block design (L-head), during the war more overhead valve (ohv) engines were used, and after the war all new ...
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. Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood. Suffix –A2 are new production with later model Cummins engine.
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 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.
In March 2017 Oshkosh was awarded a $15,080,369 foreign military sales contract for M1070A1 Heavy Equipment Transporters to Jordan and Oman, with associated testing, spare parts, and training. The estimated completion date for the award was December 2018. [8]
The military model EH was a 5-ton on road 4x2 cargo truck. The EH, EHU (cabover) and semi-tractor models EHT and EHUT had EN354 engines and disc wheels. Early trucks had standard commercial cabs, later open military cabs were used. Of 3,500 EH and 50 EHT built in 1943–1944, over 2,400 were exported to the British. [7] [8]
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.
[1] [3] FMTV A1Rs have a 2004 EPA emissions compliant version of the same engine with the same power output. [20] FMTV A1 variants have an earlier 1998 EPA emissions-compliant version of this engine, the 3126 ATAAC, which produced 275 hp at 2,400 rpm and 815 Lb.-Ft.torque at 1,600 rpm in LMTV variants, and 330 hp and 850 Lb.-Ft.torque in MTV