Mack NO
| Mack NO series | |
|---|---|
Mack NO-6 truck; Overloon War Museum, Netherlands
|
|
| Type | 7 1⁄2-ton (6,803kg) 6x6 Prime mover |
| Place of origin |
 United States
|
| Production history | |
| Manufacturer | Mack Trucks |
| Produced | 1943–1945 |
| No. built | 2,050 (total all models) |
| Variants | NO2, NO3, NO6, NO7 |
| Specifications (NO7) | |
| Weight | 29,103 lb (13,201 kg) empty |
| Length | 24 feet 8 inches (7.52 m) |
| Width | 8 feet 6 inches (2.59 m) |
| Height | 10 feet 4 inches (3.15 m) |
|
|
|
| Engine | Mack EY 159 hp (119 kW) at 2,100 rpm |
| Transmission | 5 speed dual range transfer case |
| Suspension | Beam axles on leaf springs |
| Fuel capacity | 160 US gal (610 l) |
|
Operational
range |
400 mi (643.7 km) on road |
| Speed | 32 mph (51 km/h) on road |
The Mack NO was a heavy 6x6 cargo truck designed in the 1940s by the American manufacturer Mack Trucks. It was used by the U.S. Army as an artillery tractor for heavy artillery during and after World War II. The official U.S. Army designation was: Truck, 7 1/2 ton, 6x6, Prime Mover. Its G-number was (G-532).
In 1940 Mack Trucks started the development of an artillery tractor for the U.S. Army, with a payload of 7 1⁄2 tons (6,803kg), to tow the 155mm “Long Tom” field gun, the 8 inch howitzer, and the 240mm howitzer. A contract for the production of the vehicle was awarded in September 1940, and in January 1942 a vehicle of the NO-1 type towed the first 240mm howitzer carriage from the Bucyrus plant in South Milwaukee, Wisconsin to the Aberdeen Proving Ground test facility.
The NO-1 was the first in a series of five very similar prime mover vehicles. The NO-2 differed in details, among them a canvas cabin roof (the NO-1 had a metal roof) and the winch behind the front bumper (above the bumper in the NO-1). A total of 403 units of the NO-2 were delivered in 1943. The next prime mover models, which marginally differed from the NO-2, were the NO-3 and NO-6. A total of 1,097 units of these were ordered and delivered in 1943 and 1944. The last of the series was the NO−7 model, of which 188 were delivered in 1944 and 362 in 1945. Several NO-7 were provided after the war to the European armies being rebuilt, including those of United Kingdom, France, Belgium and Netherlands.
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Wikipedia