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

3.4.2.7 Auxiliary 24-volt system with trailer receptacle. When specified (see 6.2), an auxiliary 24-volt system with a trailer receptacle shall be furnished. Either a converter type

(see 3.4.2.7.1) or an alternator type (see 3.4.2.7.2) system meeting specified requirements shall be furnished. A trailer receptacle, conforming to MS 75021-2, with cover assembly, shall be provided in an accessible location on the rear end of the vehicle. A twelve-conductor truck

tractor cable, not less than 2800 mm (110 inches) long, with both ends of the cable equipped with connectors conforming to MS 75020-1 and MS 75020-2, shall be furnished. The cable assembly shall be stowed in the vehicle. The 24-volt, 12-ampere output service lighting circuit shall be connected through the appropriate lighting controls to terminals B, D, E, J and L of MS 75021-2.

* 3.4.2.7.1 Converter type 24-volt system. The 12- to 24-volt converter(s) shall operate from the 12-volt battery (see 3.4.2.7). The output capacity shall be not less than 24 amperes. More than one converter may be provided to furnish a total of 24 amperes.

3.4.2.7.2 Alternator type 24-volt system. The alternator type 24-volt system shall be separate from the 12-volt vehicle lighting and ignition system and shall include:

(a) Nominal 24-volt alternator with not less than 24-ampere rated capacity and capable of providing not less than 7 amperes dc output at normal engine idle speed

(b) Two 12-volt batteries with a combined capacity of at least 40 ampere hours at a 20-hour rate or one 24-volt battery with a 20-ampere hour capacity at a 20-hour rate

(d) An ammeter for the 24 volt system, mounted on the instrument panel.

* 3.4.2.8 Radio interference suppression. The vehicle shall be suppressed to limit the electromagnetic radiation in accordance with SAE J551. Any body equipment emitting electromagnetic radiation shall be suppressed to the same level as the vehicle chassis.

3.4.3 Fue1 system. The fuel system shall conform to Federal Motor Carrier Safety

Regulations 393.65 and 393.67.

3.4.3.1 Air cleaner. An air cleaner shall be furnished.

* 3.4.3.2 Fuel tank(s). Fuel tank(s) for class 10 wreckers shall have not less than 75.6 L (20 gallons) total capacity. All other classes of wreckers shall be equipped with step type fuel tank(s) of not less than 189 L (50 gallons) total capacity (163 L (43 gallons) for vehicles destined for California). Except for class 10, when more than one tank is furnished on diesel engine driven vehicles, means shall be provided to assure an equalized fuel level in both tanks. When more than one tank is furnished on gasoline engine driven vehicles, or on class 10 vehicles (diesel or