MIL-T-62255 Truck Tractor, Yard Type, 4 X 2, Xm878This specification covers diesel engine driven, four-wheel, two rear wheel drive truck-tractor, yard type, with a one man half cab, having a minimum gross vehicle weight rating GVWR of 43,500 pounds and a gross combination weight rating GCWR of 100,000 pounds. Vehicles under this specification shall be procured only from a manufacturer who meets the standard commercial and commercially proven component criteria. Vehicles shall be warranted by the manufacturer as specified in the procurement documents.

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MIL-T-62255C(AT)

No. 204. Turning radius shall not be more than 24 feet, curb to curb (see 3.4.7.1) as defined in paragraph 2.3 of SAE J645, 1979 Edition.

3.4.12 Windshield wipers and washers. Vehicle shall be equipped with windshield wiper and windshield washer. The windshield wiper(s) shall at least conform to the requirements of SAE J198, Federal Motor Carrier Safety Regulation 393.78 and Federal Motor Vehicle Safety Standards No. 102 and 104. Windshield wiper shall be multi-speed type and operated by an air motor.

3.4.13 Cab heater and defroster. Manufacturer's standard fresh air heater and defroster with controls shall be capable of providing adequate heat and window visibility in ambient temperature of minus 25°F in accordance with SAE J382.

3.4.13.1 Heater. Vehicle shall be provided with a hot water heater with blower and fresh air intakes and discharge outlets to the floor and outlets to assure a flow of heated air through the vehicle cab. Heater shall provide crew comfort of not less than 45°F when the outside ambient air temperature of -25°F. The heating system shall be provided with adjustable controls to provide outside air, recirculated air or a variable mixture as desired to circulate through the main heater core. In addition, the heater blower shall be capable of providing outside air without circulating through the heater core. Heater outlets shall be adjustable by the operator. Heater hoses shall not interfere when cab is tilted.

3.4.13.2 Defrosting system. Defrosting system shall be furnished. Defrosting system shall conform to Federal Motor Vehicle Safety Standard No. 103 and SAE J381 and 382 and at an ambient temperature of minus 25°F to provide 180 degree windshield visibility. Defrosting system shall be complete with blower and shall be capable of defrosting the windshield with heated air or with outside air. Controls shall be furnished. Defroster outlets shall be provided.

3.4.14 Controls and operating mechanisms. All controls and operating mechanisms shall be located for left-hand drive. Controls shall be complete and conveniently operable by the driver. Lever controls shall be designed and located to permit easy entrance and exit of operator, to and from the driver's compartment. Instruments and controls shall be identified as to their function and installed in a manner to facilitate removal and servicing. All instruments shall be visible to driver when seated in driving position. Control and illumination shall be in accordance with FMVSS No. 101. Controls and operating mechanism shall be guarded or positioned to preclude personnel from inadvertently operating the control or mechanism.