MIL-T-62145 Trucks: Elevating Body, Diesel And Gasoline Engine Driven, 21,000 To 39,500 Pounds Gvw, 4X2 And 6X4, CommercialThis specification covers diesel and gasoline engine driven four-wheel, two-rear-wheel drive, and six-wheel, four-rear-wheel drive vehicles having minimum gross vehicle weights GVW of 21,000 to 39,500 pounds, for normal operating conditions. The vehicles are commercial trucks equipped with stake and platform or van bodies, capable of elevating the body and cargo to a specified height for loading and unloading the cargo into and out of aircraft. The 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-62145E

* 3.4.5.2 Clutch. The clutch shall be the largest capacity clutch offered for the class, model vehicle, and engine furnished, with clutch torque capacity exceeding maximum delivered engine torque. The clutch lining shall be asbestos free.

* 3.4.5.3 Automatic or semiautomatic transmission. When specified (see 6.2), the vehicle shall be provided with an automatic or semiautomatic transmission. The transmission shall include a hydraulic torque convertor and not less than four forward gear ratios for 4 x 2 models and five forward gear ratios for 6 x 4 models. Normal driving range selector position shall provide not less than four gear ratios without movement of the selector. The transmission shall be provided with an SAE J704 power takeoff opening. The input torque capacity of the transmission shall be at least equal to the maximum torque delivered by the engine.

* 3.4.5.4 Power take-off. A power takeoff shall be provided. 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. A caution decal or plate reading "DO NOT OPERATE VEHICLE AT HIGHWAY SPEEDS WITH POWER TAKEOFF ENGAGED" shall be provided and installed, readily visible to the seated driver. The decal or plate shall conform to type I or type II, class 1 of MIL-M-43719 or composition A (class l or 2) or composition C of MIL-P-514.

3.4.6 Driveline components. Driveline 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 chassis frame shall be the manufacturer's standard for the type and class vehicle furnished. The vehicle shall have a heavy duty main frame or frame with reinforcements. The heavy duty frame shall have frame rails of a greater section modulus than the manufacturer's standard for the class vehicle furnished and shall provide structural strength at least equivalent to the reinforced frame specified herein. Reinforcements shall extend at least from the rear of the front-suspension, rear hanger bracket to the front of the rear-spring, front hanger bracket. Reinforcement shall provide sufficient structural strength in the chassis frame

through increased resisting bending moment to at least equal the load imposed, with body loaded to required GVW and in any elevated position. The chassis frame rails shall not project beyond the rear end of the body.

3.4.8 Suspension. The vehicle shall be equipped with a suspension system with components having a rated capacity at least equal to the load imposed on each member, measured at the ground, with the vehicle loaded to required GVW. When suspension capacity is rated at the spring pads, unsprung weight shall be deducted. The vehicle shall be equipped with hydraulic, double-acting shock absorbers at the front wheels. Suspension system ratings shall equal or exceed the loads imposed during all operating and test conditions specified herein.