Studebaker US6

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"US6" redirects here. For the road, see U.S. Route 6.
Studebaker US6
Studebaker US.jpg
US6 Cargo truck with winch

Type 2 12 ton (2268kg) 6x6 trucks
5 ton (4,536kg) 6x4 trucks
Place of origin United States
Production history
Designer Studebaker
Manufacturers Studebaker, REO
Production dates June 1941-August 1945
Total built (all models) 219,882
Dimensions
Model Cargo U1[1]
Weight (empty) 9,875 lb (4,479 kg)
Length 251 in (6.38 m)
Width 88 in (2.24 m)
Height 106 in (2.69 m)
(reducible to) 87 in (2.21 m)
Driveline
Engine Hercules JXD
Power 86 hp (64 kW)
Transmission 5 speed x 2 range
Layout 6X6
Suspension Live axles on leaf springs
Range 240 mi (386.2 km)
Speed 45 mph (72 km/h)

The Studebaker US6 (G630) was a class of 2 12 ton (2268kg) 6x6 and 5 ton (4,536kg) 6x4 trucks manufactured by the Studebaker Corporation and REO Motor Car Company during World War II.

History[edit]

In 1940 the US Army set a requirement for a 6x6 truck with a 12 ft (3.66 m) long cargo area and 2 12 ton (2,268 kg) off-road payload. Studebaker and Yellow Coach (a GM brand) submitted very similar models, with many shared components, while International Harvester submitted its own unique design. All three were accepted and in production by 1941.

Studebaker and REO built 219, 882 2 12-ton (2,268kg) 6x6 and 5-ton (4,536kg) 6x4 trucks in thirteen variations. Studebaker was the primary manufacturer, building 197,678, while REO sub-contracted 22,204 more. Most were exported to the Soviet Union.[2][3]

Specifications[edit]

Engine and driveline[edit]

The US6 used a Hercules JXD engine, a 320 cu in (5.2 L) gsoline L-head inline 6 cylinder that developed 86 hp (64 kW) at 2800rpm and 200 lbf·ft (271 N·m) at 1150rpm. A conservative and reliable engine with a compression ratio of only 6:1, it could use very low octane gasoline. This engine was also used in the M3 and later M8/M20 armored cars.[1][4][5][6]

The transmission was a Warner T 93 5 speed with a direct 4th gear and overdrive 5th gear. The transfer case had high and low gears, and engaged the front axle. In 6x4 models it was blocked in high and did not drive the front axle. Both front and rear axles were a Timken split type. The transmission was also used by CCKWs, as were many transfer cases and axles.[1][4][5][6]

Chassis[edit]

The US6 had a ladder frame with three driven beam axles, the front on semi elliptical leaf springs, the rear tandem on quarter elliptical leaf springs with locating arms. There were two wheelbases, the 157 in (399 cm) long wheelbase (LWB) used in most models, and the 148 in (376 cm) short wheelbase (SWB), used in semi tractors and dump trucks. All models had 7.50-20” tires and dual rear tires. 6x4 models, intended for on road use only, were rated at 5 tons (4536kg), twice the 6x6’s off road rating.[1][4][5][6]

Body[edit]

The US6 used Studebaker’s civilian truck cab, modified for military use. Studebaker trucks were unique from other 2 1/2 ton trucks built for the war effort because vent windows were included in each door. These windows were separate from the window that rolled down into the door and could be rotated out to help with ventilation.

Studebaker designed the open military cab also used by the CCKW, but their major customer, the U.S.S.R, preferred the closed cab for their climate. While Studebaker's open cab became the US standard, the US6 returned to the closed cab after only 10,000 units.[5]

Model illustrations[edit]

Dimensions[edit]

Model[1]
Body
Wheelbase
Drive
Length Width Height
(overall)
Weight
(empty)
Cargo U1
12 ft (3.7 m) bed
Short
6x6
251 in (6.38 m) 88 in (220 cm) 106 in (270 cm) 9,875 lb (4,479 kg)
Cargo U2
with winch
Short
6x6
265 in (670 cm) 88 in (220 cm) 106 in (270 cm)

10,485 lb (4,756 kg)

Cargo U3
17 ft (5.2 m) bed
Long
6x4
335 in (850 cm) 88 in (220 cm) 106 in (270 cm)
Cargo U4
with winch
Long
6x4
359 in (910 cm) 88 in (220 cm) 106 in (270 cm)
Tanker U5[7]
750 US gal (2,800 l)
Long
6x6
251 in (640 cm) 88 in (220 cm) 87 in (220 cm) 10,585 lb (4,801 kg)
Tractor U6 Short
6x4
210 in (530 cm) 86 in (220 cm) 87 in (220 cm) 8,190 lb (3,710 kg)
Cargo U7
17 ft (5.2 m) bed
Long
6x4
335 in (850 cm) 88 in (220 cm) 106 in (270 cm)
Cargo U8
with winch
Long
6x4
359 in (910 cm) 88 in (220 cm) 106 in (270 cm)
Cab/chassis U9 Long
6x?
87 in (220 cm) 87 in (220 cm)
Dump U10
End dump
Short
6x6
225 in (570 cm) 88 in (220 cm) 91 in (230 cm) 10,150 lb (4,600 kg)
Dump U11
with winch
Short
6x6
240 in (610 cm) 88 in (220 cm) 91 in (230 cm) 10,760 lb (4,880 kg)
Dump U12
Side dump
Short
6x6
225 in (570 cm) 88 in (220 cm) 91 in (230 cm) 10,150 lb (4,600 kg)
Dump U13
with winch
Short
6x6
240 in (610 cm) 88 in (220 cm) 91 in (230 cm) 10,760 lb (4,880 kg)

Combat use[edit]

Large numbers of Lend-Lease Studebaker trucks were sent into the Soviet Union via the Persian Corridor. The Soviets found them a good platform for "Stalin Organ" Katyusha rocket launchers, although it was not their prime use in the Soviet Union. It fulfilled many roles in the Red Army, such as pulling artillery and was renowned for its ruggedness and reliability. The truck was affectionately known as the Studer by Soviet troops.

Studebaker US6 trucks were also used in the construction of the Burma Road as well as the Alcan Highway in North America.

Gallery[edit]

See also[edit]

References[edit]

  1. ^ a b c d e "TM-9-807 2 12 ton 6x6 Truck and 2 12 to 5 ton 6x4 truck". US War Dept. 16 December 1943. Retrieved 28 June 2015. 
  2. ^ Crismon, Fred W (2001). US Military Wheeled Vehicles (3 ed.). Victory WWII Pub. pp. 184, 328–329. ISBN 0-970056-71-0. 
  3. ^ Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. p. 122-124. ISBN 0-87349-508-X. 
  4. ^ a b c Crismon (2001).
  5. ^ a b c d Doyle (2003).
  6. ^ a b c TM 9-1807 "TM-9-1807 Powertrain, Chassis, and Body for Studebaker US6 and US6x4". US War Dept. 17 March 1944. Retrieved 28 June 2015. 
  7. ^ "TM-9-2800-1947 Military Vehicles". US Dept. of the Army. 27 October 1947. Retrieved 28 June 2015. 

External links[edit]