MIL-T-46797 Truck, With High Lift Dump Mechanism: Dump, Cargo And Stake Body Types, Diesel And Gasoline Engine Driven, 24,000 Gvw, 4X2, CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive, commercial trucks with a high lift dump mechanism. The truck has a minimum gross vehicle weight GVW of 24,000 pounds for normal operating conditions. Vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in procurement documents.

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MIL-T-46797B(AT)

* 3.4.5 Transmission. Unless otherwise specified (see 3.4.5.2), a manually shifted transmission shall be provided on the vehicle. Input torque capacity of the transmission shall be at least equal to the maximum torque delivered by the engine. The vehicle shall be provided with not less than seven forward speeds. A multispeed transmission or auxiliary transmission shall be furnished. Gear ratios in transmission and axles shall be matched to provide a progressive shifting pattern throughout the complete range, and shall provide required vehicle performance (see 3.3.1). The transmission shall be provided with SAE J704 power takeoff openings. The transmission shall provide for maximum ease of shifting in all speeds.

3.4.5.1 Clutch. The clutch shall be the largest capacity clutch offered for the vehicle and engine furnished with torque capacity exceeding maximum delivered engine torque.

3.4.5.2 Automatic or semiautomatic transmission. When specified (see 6.2), the vehicle shall be provided with automatic or semiautomatic transmission. The transmission shall provide continuous drive. The transmission shall include a hydraulic torque convertor and not less than four forward gear ratios. Normal driving range selector position shall provide not less than four gear ratios without movement of the selector. A drive gear for the power takeoff shall be provided.

* 3.4.5.3 Power takeoff. The power takeoff shall be of a rated capacity to operate powered equipment. Controls to operate the power takeoff shall be located in the truck cab accessible to the seated driver.

3.4.6 Drive line components. Drive line components shall be adequate to transmit the maximum delivered torque of the engine, as developed through the maximum gear train reduction.

3.4.7 Frame. The vehicle shall be provided with a heavy duty main frame or frame reinforcements. Heavy duty frame shall have frame rai1s of greater section modulus than the manufacturer's standard for the vehicle furnished and shall provide structural strength at least equivalent to the reinforced frame specified herein. The reinforced frame shall have reinforcements extending at least from the rear of the front-suspension, rear hanger bracket to the front of the rear-spring, front hanger bracket. Reinforcements shall provide sufficient structural strength in the chassis frame through increased resisting bending moment to at least equal the loads imposed, with the vehicle loaded to provide specified GVW and in maximum high lift dumping angle. Frame rails shall not project beyond the rear end of the body.