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|  MIL-T-62491C
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TABLE VI. Gradeability.
Class
GVW
Percent of grade
kg (pounds)
5.0
4540 (10,000)
10
3.0
9530 (21,000)
21
2.5
10 900 (24,000)
24
2.0
12 700 (28,000)
28
1.5
14 500 (32,000)
32
1.5
15 650 (34,500)
34.5
1.5
16 350 (36,000)
36
1.5
17 900 (39,500)
39.5
1.5
20 200 (44,500)
44.5
1.5
22 700 (50,000)
50
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.
Number of forward speeds
Maximum low speed
km/h (mph)
5
8.0 (5.0)
7 or 8
6.4 (4.0)
9 or 10
4.8 (3.0)
13 or more
4.0 (2.5)
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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