Automatic or semiautomatic transmission

Page Title: Automatic or semiautomatic transmission
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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.

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