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)

3.4.2.5  Batteries.  Each battery shall be of 12-volt potential.  The total reserve capacity ratings and the total cold cranking ratings at 0°F, both measured in accordance with SAE J537, shall be not less than specified in table I.  The batteries shall be of the maintenance free type having the maintenance-free characteristics listed in W-B-131.

TABLE I.  Batteries.

*    3.4.2.6  Radio interference suppression.  The vehicle shall be suppressed to limit electromagnetic radiation in accordance with SAE J551.  Any body equipment emitting electromagnetic radiation, except the vibrating roller auxiliary engine (see 3.5.5.3), shall be suppressed to the same level as the vehicle chassis.

3.4.3  Fuel system.  The fuel system shall conform to Federal Motor Carrier Safety

Regulations 393.65 and 393.67.

*    3.4.3.1  Air cleaner.  An air cleaner shall be furnished.

*    3.4.3.2  Fuel tanks.  The fuel tank(s) shall be the manufacturer's standard for the vehicle specified with not less than 30 gallons total capacity.  When more than one tank is furnished on diesel engine driven vehicles, means shall be provided to assure an equalized fuel level in both tanks.  When more than one tank is furnished on gasoline engine driven vehicles, a selector valve connecting either tank to the engine fuel intake shall be provided and means shall be provided to monitor the fuel level of either tank from a single fuel gage.

*    3.4.4  Exhaust system.  The exhaust system shall conform to Federal Motor Carrier Safety Regulation 393.83.  If vertical exhaust mufflers are furnished, a heat shield shall be furnished. Vertical exhaust systems shall be provided with a hinged rain cap.

*    3.4.5  Transmission.  Unless otherwise specified (see 3.4.5.2), a manually shifted transmission shall be provided.  The input torque capacity of the transmission shall be at least equal to the maximum torque delivered by the engine.  The manually shifted transmission shall have not less than five forward and one reverse speed with SAE J704 power takeoff openings on both right and left sides.  The transmission shall provide for synchronized shift for at least the three highest forward speeds, or a constant mesh transmission may be provided.  The transmission and axle gear ratios shall be selected to provide the performance specified in 3.3.1 through 3.3.1.3.

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