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)

lubrication and shall include an air cleaner.  An adjustable, continuous-running type compressor unloader shall be provided.

*    3.5.2.3  Auxiliary engine.  An engine to drive the compressor shall be mounted on the base welded to the top of the material tank.  When a diesel engine driven truck chassis is provided, the compressor engine shall be a Lister Model TS2 or equal diesel engine with a rating of not less than 35 horsepower.  When a gasoline engine driven truck chassis is furnished, the compressor engine shall be a Wisconsin Model VG4D or equal gasoline engine with a rating of not less than

32 horsepower.  Both type engines shall have not less than 2 cylinders, a 12-volt dc electric

starter connected by a one-piece cable to the truck battery, and an air operated slow-down device to idle the engine when the air compressor is unloaded.  Drive belts and pulleys shall be provided with safety guards.

3.5.2.4  Air receiver.  An air receiver shall be connected between the compressor and the material tank.  The receiver shall be bolted to the truck frame and shall be constructed to ASME standards for a 150 psi working pressure.  A safety valve, air pressure gage, air regulating valve, check valve, drain valve, 1/4-inch air cock, 3/4-inch globe valve, and a Dixon quick coupling or equal shall be provided.

3.5.2.5  Spray gun.  An Essick Model EG-3000 six-foot, dual control, air atomized or straight pressure emulsion spray gun, or equal, shall be provided.  Three spray tips of assorted sizes shall be provided.  Two material hoses, each with not less than 3/4 inch inside diameter (id), one not less than 25 feet in length and the other not less than 10-1/2 feet in length shall be provided.

Two air hoses, each with not less than 3/8 inch id, one not less than 25 feet in length and the other not less than 11-1/2 feet in length, shall be provided.  Fittings for interconnecting the spray gun, hoses, air receiver and material tank to provide dual spray operations shall be attached. Means for securely storing the spray gun and hoses on the exterior of the vehicle shall be provided.

3.5.2.6  Heater.  A liquified petroleum gas (LPG) heater with controls for venting the tank during the heating cycle shall be provided.  An open-faced storage box to accommodate two

11-kilogram LPG cylinders, each 12 inches in diameter and 24 inches in height, shall be provided.  Devices to hold the cylinders securely in place during vehicle transit, but which

permit ready removal of the cylinders for filling and testing, shall be provided.  A flexible LPG

hose with standard fittings shall be provided between the heater and the storage box.  Final

fittings compatible with the metric fittings on the LPG cylinders are not required.

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