Autocar U8144T

Autocar U8144T

Autocar Ponton Tractor
Type 5-6 ton 4x4 Ponton tractor
Place of origin United States
Production history
Manufacturer Autocar
Produced 1941-1945
Number built 2,711
Variants U8144 Van
Specifications (U8144T w/open cab[1])
Weight 16,100 lb (7,300 kg) (empty)
Length 20 ft 6 in (6.25 m)
Width 8 ft 1 in (2.46 m)
Height 9 ft 7 in (2.92 m)
reducible to 7 ft 6 in (2.29 m)
Engine Hercules RXC
131 hp (98 kW)
Transmission 5 speed x 2 range trf. case
Suspension Live beam axles on leaf springs
Fuel capacity 90 US gallons (340 l)
Operational
range
 234 mi (376.6 km) w/load
Speed 42 mph (68 km/h)

Truck, ponton tractor, 5- to 6-Ton, 4x4 Autocar, Model U8144T (G-511) was the largest, and most numerous, of a family of heavy trucks developed for, and deployed primarily with, the United States Armed Forces in World War II. They were produced by the Autocar Company from 1941 to 1945 with 2,711 being built.

History

In the late 1930s, as the war approached, the Autocar Company, who had been selling trucks to the Army since 1909, began adapting their commercial cab over engine trucks for military service. In 1939 the Model U70 5-ton (4,536 kg)(on road cargo rating) 4x2 was developed into the U2044 and U4044 2 1⁄2 ton (2,268 kg)(off load rating) 4x4s, the U5044T and 7144T (“T” indicates tractor) 5-ton (4,536 kg) 4x4s, and the largest, the U8144T. In 1941 the U8144T became the Army's standard ponton tractor, and went into production.[2][3]

Engine and driveline

A Hercules RXC engine was used. This 529 cu in (8.7 L) L-head inline 6 cylinder gasoline engine developed 131 hp (98 kW) at 2300 rpm and 368 lbf·ft (499 N·m) of torque at 900 rpm.

The 5-speed manual transmission was direct in 4th gear and had an overdrive gear. A 2-speed transfer case also engaged or disengaged the front axle.

The ladder frame had a 21 feet 11 inches (6.68 m) wheelbase with two banjo style live beam axles on semi elliptical leaf springs. Brakes were full air, the tires were 12.00x20.[3][4]

Bodies

The U8144T tractor was used to tow semi-trailers with 10-ton or 25-ton ponton bridging equipment. Directly behind the cab was a large toolbox. 2711 were built between 1941 and 1945. 42 went to the Soviet Union under the Lend Lease Act.[5][6][7]

The U8144 had a similar chassis with van bodies built by York-Hoover. They were used by the Signal Corps for the SCR-270 early warning radar. The K-30 was the operating truck and the K-31 was the power truck. The K-30 had a window on the left and right front side of the van body and the K-31 did not. There was also a K-62(-A) operating truck. 607 of all types were built.[8]

Another Autocar model, the U7144T (G-510), towed a trailer with SCR-270 antenna components. It had the same driveline as the U8144T but was a cargo tractor, with a shorter wheelbase and no toolbox. It did not have the U8144's oversize tires, using 9.00x20s instead, and was rated at 4-tons off road. White also built it as their Model444T (G-691).[9][10][11]

Gallery

See also

References

  1. ↑ TM 9-817 (1944). "5- to 6-ton 4x4 Ponton Tractor (Autocar U8144T)". US War Dept. Retrieved 30 Aug 2015.
  2. ↑ Crismon, Fred W (2001). US Military Wheeled Vehicles (3 ed.). Victory WWII Pub. pp. 84, 163, 189, 194, 270–271, 276–277, 281, 284, 353. ISBN 0-970056-71-0.
  3. 1 2 Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. pp. 171–174. ISBN 0-87349-508-X.
  4. ↑ TM 9-817 (1944), p. 5-9.
  5. ↑ Engines of the Red Army in WW2: Autocar U-8144T
  6. ↑ "TM 9-2800 Standard Military Motor Vehicles". US War Dept. 1 Sep 1943. pp. 510–513. Retrieved 30 Jun 2015.
  7. ↑ "TM 5-273 25-ton Ponton Bridge, Model 1940". US War Dept. 1 Jul 1942. Retrieved 30 Jun 2015.
  8. ↑ "TM 9-2800 Military Vehicles". US Dept. of the Army. 27 Oct 1947. p. 304. Retrieved 30 Jun 2015.
  9. ↑ Doyle (2003), pp. 166–168.
  10. ↑ Crismon (2001), p. 276-277.
  11. ↑ "TM 9-816 4- to 5-ton Tractor Truck (Autocar Model U7144T)". US War Dept. 21 Mar 1944. Retrieved 30 Jun 2015.
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