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 IX.  Minimum number of vehicle forward speeds.

*    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

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