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

shall be not less than 75 mm (three inches), and the wall thickness shall be not less than that specified in schedule 40 of ASTM A53. The pipe type front bumper shall have half-round ball ends.

*    3.4.26.3  Combination step plate and gravel guard.  When a front mounted winch is specified, a combination step plate and gravel guard shall be furnished.  The step plate shall be fabricated of not less than 14 gage (1.897 mm) (0.0747 inch) steel tread plate exclusive of projections.  The

step plate shall be secured to the front bumper and shall be not less than 6.4 mm (0.25 inch) or not greater than 9.5 mm (0.375 inch) from the chassis sheet metal.  Rubber flaps may be employed to achieve these dimensions and shall be employed when required by tilting hood/fender vehicles for unrestricted tilting.  The step plate shall be capable of supporting 1460 kilograms per square

meter (kg/m2) (300 pounds per square foot).  The step plate shall not deflect more than 3.2 mm

(0.125 inch) under the loads imposed.

*    3.4.27  AM/FM radio.  When specified (see 6.2), the manufacturer's standard AM/FM radio shall be provided.

*    3.4.28  Servicing and adjusting.  Prior to acceptance of the vehicle by the Government inspector, the contractor shall service and adjust each vehicle and its mounted equipment for operational use including at least the following:  alinement of lights; adjustment of engine and brake systems; filling and charging of batteries; alinement of front wheels; inflation of all tires; complete lubrication of chassis, engine, running gear, and mounted equipment with grades of lubricants recommended for the ambient air temperature at the delivery point; servicing of cooling system in accordance with 3.4.28.1; servicing of windshield washer reservoir with water and appropriate additives; and checking level of hydraulic fluid reservoir.

*    3.4.28.1  Engine coolant.  The engine coolant shall be a solution of ethylene glycol antifreeze and water or propylene glycol antifreeze and water, in equal parts of antifreeze and water by volume.  Ethylene glycol antifreeze shall conform to ASTM D 4985 with not more than 250 parts per million silicates.  Propylene glycol antifreeze shall be in the specific formulation approved by the engine and cooling system manufacturers.  When specified (see 6.2), the percentage of antifreeze in the cooling system shall be increased to provide protection against freezing down to

-54°C (-65°F).

*    3.5  Type I hydraulic wrecker.  Type I hydraulic wrecker shall have the dimensions and load capacities specified in table X for the corresponding vehicle size and GVW.

*    3.5.1  Type I hydraulic wrecker optional extended boom.  When specified for size 40T and

45T (see 6.2), extended boom length ( "j" in table X) shall be not less than 3960 mm (156 inches)

with an extended boom rating ("h" in table X) of not less than 5450 kg (12,000 pounds).

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