The spare tire was moved behind the cab and a `12 feet (3.66 m) long bed was placed further back on the chassis. The prime mover had limited cargo room, the Engineers wanted a model with a larger body to carry bridge pontoons. Welding tanks, an air compressor, cables, block and tackle, chains, tow-bars, and other equipment were carried. A brace for the wrecker frame held a spare tire. The body had low sides on the rear half which tapered to the floor in the front, making clearance for the boom to swing. Controls on both sides of the body allowed each winch to raise or lower independently of the other. A power take-off on the transfer case drove a transmission with two winches in the wrecker frame. When lifting the booms could be separated and rotated 90% forward to the side, an outrigger could be lowered to increase lifting capacity. When towing the booms were rotated to the rear, connected at the ends, and worked as one A-frame. The wrecker had a Holmes twin-boom design with a swinging boom and powered hoist cable on each side. Early models had all steel bodies, in 1942 they were replaced by largely wood types to conserve steel. Two spare tires were mounted inside the body, across the front. It had sideboards with fold down troop seats and bows for an overhead tarpaulin. With a short wheelbase and rear overhang, the body could only be 11 feet (3.4 m) feet long. They had a pintle hitch at the rear to tow up to 11,000 pounds (5,000 kg) off-road and 25,000 pounds (11,000 kg) on road. The basic cargo model was a prime mover used to tow the 155 mm howitzer M1 and transport the gun crew, equipment, and ammunition. Models Ĭhemical warfare crane Cargo Model 968 machine gun and every fourth truck was equipped with one. Both cab types could be equipped with a ring for a. These were easier to use in combat and also reduced shipping height, very important at the time. Įarly models had commercial type cabs, in June 1944 open military type cabs were introduced. Trailer air connections applied trailer-brakes with the truck brakes and a hand lever could apply the trailer brakes alone. Brakes were full air with drum brakes on all wheels. (Measurements are from the centerline of the front axle to the centerline of the rear tandem). The standard 151 inches (3.8 m) and the long 172 inches (4.4 m) used by the pontoon cargo truck. Chassis Īll models had a ladder frame with three live axles, the front on leaf springs, the rear tandem axles on leaf springs with locating arms. Dump and wrecker bodies were driven off the transfer case with the transmission in gear. The winch was driven off the transmission with it in neutral and was operated from inside the cab. The exception was dumps built before June 1944. Most trucks had a front-mounted 15,000 pounds (6,800 kg) Gar Wood winch with 300 feet (91 m) of cable. Axles were Timken double reduction “pumpkin” type. A transfer case had a high and low range, a neutral for power take-off operation, and engaged the front axle. Ī 5-speed manual transmission with a very low 1st and an overdrive 5th gear was used. Specifications Engine and driveline Īll standardized models used Hercules RXC engines, a 529 cu in (8.7 L) L-head inline 6 cylinder gasoline engine developing 131 horsepower (98 kW) at 2100 rpm and 396 pound force-feet (537 N⋅m) of torque at 1000 rpm. In addition to trucks built for Canada, 2,245 were exported under the Lend-Lease Act, most to the British, French, and Canadians. A crane for chemical weapons and an extra long cargo version for Canada were also built. The chassis was also the base for Ordnance's standard medium wrecker truck, and was used by the Corps of Engineers for cargo, dump, and specialty bodies. They would build over 30,000 chassis between 19. In 1941 their improved Model 968 was standardized and went into production at their Chicago plant. Īutocar, Diamond T, and White were building prototypes, Diamond T built 1,000 Model 967s in 1940. 4-ton (3,600 kg) load rated six-wheel drive trucks had been successful towing artillery in the 1930s, and the size would be standardized to tow the Field Artillery Branch's new 155 mm howitzer M1. In 1939-1941 the Army Ordnance Corps was developing a complete line of tactical trucks that could operate over all roads and cross-country terrain in all weather.
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