 |
|||
|
|
|||
| ||||||||||
|
|  MIL-T-62491C
TABLE IX. Minimum number of vehicle forward speeds.
Minimum number of forward speeds
Vehicle
4x2 and 6x4 models
4x4 and 6x6 models
class
8
4
10
9
5
21, 24, 28
9
8
32
9
9
34.5, 36, 39.5
9
13
44.5, 50
* 3.4.5.2 Clutch. The clutch shall be the largest capacity clutch offered for the class of vehicle
and the engine furnished, with the clutch torque capacity exceeding the maximum delivered engine
torque. The clutch lining shall be asbestos free. The clutch on model 6x4 and 6x6 shall have
spring dampening and a greaseable bearing.
* 3.4.5.3 Automatic transmission. When specified (see 6.2), the vehicle shall be provided with
an automatic transmission. The input torque capacity of the transmission shall be at least equal to
the maximum torque delivered by the engine. The transmission shall include a hydraulic torque
converter and not less than three forward speeds for class 10, and four forward speeds for all
other classes, except model 6x4 and 6x6 shall have five forward speeds. Normal driving range
selector position, except for class 10, shall provide not less than four gear ratios without
movement of the selector. Except for class 10, the transmission shall be provided with a power
takeoff opening.
3.4.5.4 Transfer case. Model 4x4 and 6x6 vehicles shall be provided with a transfer case.
Unless the transfer case is equipped with devices which compensate for differential torque and
speeds between the front and rear axles, the transfer case shall provide for driver selection of
either two-wheel or four-wheel drive for model 4x4 or either four-wheel or six-wheel drive for
model 6x6. When furnished, inter-axle compensating devices shall provide for positive transfer of
power to all driving axles. Unless otherwise specified, either a one- or two-speed transfer case
may be furnished. When specified (see 6.2), a two-speed transfer case shall be furnished. When a
two-speed transfer case is furnished, the speedometer shall read accurate speed km/h (mph) with
the speed selector in high or low range.
3.4.5.5 Power takeoff. A transmission or transfer case mounted power takeoff shall be
provided, except on class 10 vehicles with an automatic transmission. The power takeoff shall be
of a rated capacity to operate powered equipment. Controls to operate the power takeoff shall be
located in the truck cab accessible to the seated driver. A caution plate or decal reading
20
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals