MIL-T-62319 Trucks, Cargo: Diesel Or Gasoline Engine Driven, 19,000 To 24,000 Pounds Gvw, 4X2 And 4X4, CommercialThis specification covers diesel or gasoline engine driven, four-wheel, two-rear-wheel drive, and four-wheel, four-wheel drive cargo trucks, having minimum gross vehicle weights GVW of 19,000 to 24,000 pounds, for normal operating conditions. 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-62319C

* TABLE III. Gradeability.

Vehicle class

Percent grade

C D

1.5

1.0

* 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 (mph) specified in table IV for the corresponding number of available forward speeds.

TABLE IV. Vehicle low speed requirement.

Model

Class

Number of forward speeds

Speed (mph)

4x2

C and D

4 or 5

7 or 8

9 or 10

4.5

3.5

3.0

7 or 8

9 or 10

5.0

4.0

3.0

4x4

9 or 10

3.0

2.5

3.3.1.3 Maximum geared speed. The maximum geared speed at engine governed speed shall be not less than 58 mph for model 4x2 vehicles and not less than 55 mph for model 4x4 vehicles. 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.

3.4 Chassis components.

3.4.1 Engine. The engine furnished for the specified vehicle class shall be the chassis manufacturer's standard or optional engine for the commercial model truck which meets or exceeds the requirements of this specification.