MIL-T-62491 Trucks, Wrecker: 4540 To 40 820 Kilograms 5-Ton To 45-Ton Lifting Capacity, Modified CommercialThis specification covers all commercial, non-tactical wreckers procured for military use. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62491C

*                                      TABLE VI.  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 recommended governed speed, and shall provide not more than the vehicle speed specified in table VII for the corresponding number of available forward speeds.

TABLE VII.  Vehicle low speed requirements.

3.3.1.3  Maximum geared speed.  The maximum geared speed at engine governed speed shall be not less than 93 km/h (58 mph) for 4x2 and 6x4 model vehicles and not less than 84 km/h

(52 mph) for 4x4 and 6x6 model vehicles.  Conformance to geared speed specified shall be determined by calculating in accordance with the following formula:

Maximum geared speed (km/h)=           Governed speed (rpm) x 1.609         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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