MIL-T-62246 Truck, Dump, Street Maintenance, Diesel And Gasoline Engine Driven, 21,000 Pounds Gvw, 4X2, CommericalThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive dump trucks equipped with a material sprayer, an auxiliary engine driven air compressor, and a vibrating roller for use in street maintenance. Vehicles shall have a minimum gross vehicle weight GVW of 21,000 pounds for normal operating conditions. Vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62246B(AT)

3.5.3 Water tank. A water tank of not less than 60 gallon capacity shall be installed on the side of the truck frame. The tank shall be pressurized from the air receiver and shall be constructed to ASME standards for a pressure of 150 psi. A 1/4-inch air regulator, pressure gage, safety valve, check valve, 2-inch filler cap and 3/4-inch garden hose threaded outlet shall be provided.

3.5.4 Solvent tank. A solvent tank of not less than 5 gallons capacity shall be installed on the side of the truck frame. The tank shall be pressurized from the air receiver and shall be complete with all fittings required for cleaning out the material hoses.

3.5.5 Vibrating roller. An Essick Model V30W2 or equal vibrating roller, suitable for being carried on the rear tailgate of the dump body, shall be furnished and stowed for shipment.

3.5.5.1 Performance. The vibrating frequency shall be not less than 4,500 vibrations per minute with a peak amplitude of not less than 0.046 inch. Centrifugal force developed shall be not less than 2,640 pounds. Maximum ground pressure on roll with vibration shall be not less than 3,640 pounds with a total applied force of not less than 144 tons per second. Speed range shall be 0 to 220 feet per minute.

3.5.5.2 Roll. The roll shall be not less than 22-1/2 inches in diameter by 30 inches wide.

3.5.5.3 Engine. When a diesel engine driven truck chassis is provided, the roller engine

shall be a Lister Model LTl or equal diesel with a rating of not less than 8.8 horsepower. When a

gasoline engine driven chassis is provided, the roller engine shall be a Wisconsin Rubbin Model W1390 or equa1 with a rating of not less than 11 horsepower. On both, a muffler and air cleaner shall be furnished. The engine shall be in an enclosed compartment with hinged doors. The engine need not be radio interference suppressed.

* 3.5.5.4 Transmission. A hydrostatic transmission providing forward and reverse speeds as specified in 3.5.5.1 shall be furnished.

3.5.5.5 Construction. A gravity sprinkler system with a 9-gallon capacity tank and full width coco mat shall be furnished. Adjustable roll scrapers, front and rear, shall be provided. Stabilizing rolls, front and rear, shall be provided. Independent controls for driving and vibrating shall be provided on the handle of the roller. Brakes with controls on the operating handle shall be furnished. A fuel tank of not less than 1-gallon capacity shall be furnished.