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|  MIL-T-62223B(AT)
3.4.3 Fuel 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. When equipped with an oil-bath
type air cleaner, oil capacity shall be not less than 1 quart.
3.4.3.2 Fuel tanks. Fuel tank(s) of not less than 100 gallons total capacity shall be
provided. When more than one tank is furnished on diesel engine driven vehicles, means shall
be provided to assure equalized fuel level in both tanks. When more than one tank is furnished
on gasoline engine driven vehicles, a selector valve connecting either tank to the engine or
auxiliary engine fuel intake shall be provided and means shall be provided to monitor the fuel
level of either tank from a single fuel gage. A photoetched corrosion resistant plate, marked to
denote the type of fuel used, shall be located in a conspicuous place near each fuel tank filler
opening.
3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier
Safety Regulation 393.83. Vertical exhaust mufflers capable of being reached easily by
personnel entering or leaving either side of the cab shall be provided with a heat shield. Vertical
exhaust system shall be provided with a hinged rain cap.
3.4.5 Automatic or semiautomatic transmission. The vehicle shall be provided with
automatic or semiautomatic transmission. The transmission shall provide continuous drive, a
hydraulic torque converter and not less than four forward gear ratios. Normal driving range
selector position shall provide not less than four forward gear ratios without movement of the
selector. A drive gear for the power takeoff shall be provided. Input torque capacity of the
transmission shall be not less than the maximum torque delivered by the engine.
3.4.6 Drive line components. Drive line components shall be adequate to transmit the
maximum delivered torque of the engine, as developed through the maximum gear train
reduction.
3.4.7 Frame. The chassis frame shall be the manufacturer's standard for the type and
size vehicle furnished, and shall be adequate for mounting the body and equipment specified
herein. The frame shall be lengthened or shortened to the required body length to provide
support for all body crossmembers. Frame modifications shall be as recommended by the
chassis manufacturer for the body builder's layout.
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