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|  MIL-T-62319C
*
TABLE III. Gradeability.
Vehicle class
Percent grade
1.5
C
1.5
D
1.0
E
* 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.
Number of
Model
Class
forward speeds
Speed (mph)
4 or 5
4.5
C and D
7 or 8
3.5
9 or 10
3.0
4x2
5
5.0
E
7 or 8
4.0
9 or 10
3.0
4x4
E
8
3.0
9 or 10
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.
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