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)

3.4.2.5.6 Wiring schematic. A wiring schematic for the electrical system specified herein shall be furnished. The schematic shall be on a plate (see 3.1.1.1.3). The schematic shall depict the 12 volt lighting system and the 28-volt lighting system. Complete operating instructions shall be furnished. The schematic shall also include the electrical starting system.

3.4.2.5.7 Blackout lighting. When specified (see 6.2), 12-volt blackout lighting shall be furnished. Blackout lighting drawings will be provided when specified.

3.4.3 Gear train. Gear train shall meet or exceed the requirements specified in 3.3 through

3.3.1.6.

3.4.3.1 Transmission. An automatic transmission shall be provided. The transmission shall be capable of automatically upshifting and downshifting in at least the four upper gear ratios. With the detent in any fixed gear ratio, the transmission shall not seek any other gear ratio unless grade and load conditions increase with fixed engine power. The transmission shall have not less than five forward and one reverse gear ratio. Normal driving selector shall provide not less than four gear ratios without manual movement of the selector. Input torque, horsepower, and revolutions per minute and rated capacity shall be greater than that delivered by the vehicle engine. The transmission and components shall be capable of accepting the GVWR loads specified. The transmission shall include an oil screen, oil cooler and an oil filter. Transmission shift level sequence, starter interlock and transmission braking effect shall conform to

FMVSS No. 102. Certify that the transmission is matched and rated for use in conjunction with

interfacing components.

MARK AS FOLLOWS: Do not tow vehicle over 20 mph and no more than 15 miles.

3.4.3.2 Hydraulic torque converter. A hydraulic torque converter for the transmission shall be furnished. A red temperature light shall be furnished on the vehicle instrument panel to indicate when the converter oil is above manufacturer's recommendations. The stall torque ratio shall be the transmission manufacturer's recommendation to meet the performance specified in

3.3.

3.4.3.3 Power take-off. Power take-off opening(s) and heavy duty drive gears shall be furnished. The power take-off opening(s) shall conform to SAE J704. The openings shall be utilized for the hydraulic elevating fifth wheel. The power take-off drive rating shall provide a torque of not less than 300 pound foot and be rated for continuous duty. Power take-off controls shall be located in the vehicle cab in an accessible position to the driver , and shall be guarded to prevent accidental actuation.