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

*    3.2.10  Asbestos.  Asbestos materials shall not be used in any form in any part of the vehicle.

3.3  Performance.

3.3.1  Speeds and gradeability.  High and low speed requirements shall be met with the vehicle loaded to specified GVW.

3.3.1.1  High speed gradeability.  The vehicle shall ascend continuous grades specified in table III at 50 miles per hour (mph).  Gradeability requirements shall be met with the main transmission in direct drive, and when a multi-speed axle or auxiliary transmission is furnished, with the axle or auxiliary transmission in high speed ratio.  Gradeability shall be verified with calculations in accordance with SAE J688 (see 6.3).

TABLE III.  Gradeability.

3.3.1.2  Low speed.  Low speed for vehicles with a manual transmission shall be calculated with the engine operating at not less than 35 percent of the recommended governed speed, and shall provide not more than the vehicle speed specified (mph) in table IV for the corresponding number of available forward speeds.

TABLE IV.  Vehicle low speed requirement.

3.3.1.3  Maximum geared speed.  The maximum geared speed at engine governed speed shall be not less than 58 mph.  Conformance to geared speed specified shall be determined by calculating in accordance with the following formula:

Maximum geared speed (mph)=                   Governed speed (rpm)         Total gear reduction x tire factor (see 6.3).

3.3.2  Service brakes.  The service brakes shall control and hold the vehicle, when loaded to its specified GVW, on a 30 percent grade.  The service brakes shall stop the vehicle, loaded to specified GVW, within the stopping distance requirements of Federal Motor Carrier Safety Regulation 393.52.

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