WAREHOUSE TRACTORS

Aviation Storekeeper 3 - Aviation theories and other practices - index
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Figure 6-2.-Forklift truck. material-handling equipment, use a forklift truck at each end of the haul for loading, unloading, and stacking. This will make the operation faster and easier. Figure 6-2 shows a 6,000-pound forklift truck. TRACTOR-TRAILER TRAINS The tractor-trailer train (fig. 6-3) is a system that consists of a self-propelled power unit connected to a series of trailers. There are various types of tractors used for pulling the trailers. Tractor-trailer trains can haul heavier tonnage than carrier-type trucks of equal horsepower capacity. They can pull trains up to the total drawbar pull of the tractor. The number of trailers one tractor can continuously pull depends upon the length of haul, nature of material, and weight of the load of each trailer. Under normal conditions, one tractor should be able to operate with three sets of trailers. One set of trailers for loading, pulling a second set underway, and a third set unloading. Tractor-trailer trains are effective for hauling loads between 400 feet to 1 mile. WAREHOUSE TRACTORS A warehouse tractor is an electric- or gasoline- powered vehicle designed to pull a train of warehouse trailers. The gasoline-powered models used in the Navy have pneumatic tires and a rated drawbar pull of 4,000 to 7,500 pounds. Electric-powered models commonly used in the Navy have solid rubber tires and a rated drawbar pull of 2,000 or 4,000 pounds. The drawbar pull, the motive force that a tractor can exert in pushing or pulling loads, is merely a means of saying tractor capability. The actual capacity of the tractor is normally far more than the drawbar-pull rating. For example, a Figure 6-3.-Tractor-trailer train. Figure 6-4.-Warehouse tractor. tractor with a drawbar pull of 4,000 pounds may have an actual towing capacity of 90 tons. Five different models of tractors was adopted as standard for the military services. The 2,000-pound, drawbar-pull, electric-powered warehouse tractor has solid rubber tires. It is a light-duty tractor for operation in warehouses and other closed storage areas. The 4,000-pound, drawbar-pull, electric-powered warehouse tractor (fig. 6-4) has solid rubber tires. It is the standard heavy-duty tractor for indoor warehousing operations. This type of tractor is used in a similar manner and for the same purposes as the light-duty, 2,000-pound model. 6-11

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