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)

3.4.1.1.3 Water pump. Engine water pump, with full blocking thermostats at engine governed speed, shall be furnished.

3.4.1.1.4 Coolant hoses and hose clamp. Coolant hoses shall be of the silicone rubber type and shall be capable of accepting a minus 65°F ambient temperature. Hoses shall be secured

with double wrap stainless steel; worm type gear hose clamps in accordance with Type F, class 4

of SAE J536.

3.4.1.1.4.1 Coolant temperature. The coolant temperature of the engine shall be the engine manufacturer's recommended operating temperature and shall be not less than 175°F.

3.4.1.2 Oil filters. A full flow, spin-off type oil filter and a by-pass type oil filter shall be furnished. Oil filters shall be in a protective location from road elements and low ambient temperatures.

3.4.1.2.1 Oil cooler. An oil cooler shall be furnished. The oil cooler shall be provided with a water drain. The oil cooler shall be of sufficient capacity to meet the speed, ambient temperature and gradeability requirements to which the vehicle will be subjected.

3.4.1.3 Fuel system. Fuel system shall conform to Federal Motor Carrier Safety Regulations

393.65 and 393.67.

3.4.1.3.1 Fuel pump. Manufacturer's commercial positive displacement, gear-type fuel pump shall be furnished.

3.4.1.3.2 Fuel tank(s). Fuel tank(s) shall have a total capacity of not less than 50 gallons. Guard on the exterior of the fuel tank(s) shall be furnished. Guard shall be bolted to enable service. Guard to protect fuel tank while working in a close environment. The fuel tank and the fuel system shall be capable of providing the required amount of fuel to the vehicle engine when ascending and descending a grade of 30 percent and side slopes of 10 percent. A red warning indicator lamp shall be provided on the instrument panel to indicate fuel in fuel tank is too low for the slope and grade requirements specified herein. Fuel lines shall be protected from

build-up of ice, snow, road splash and stone throw.

3.4.1.3.3 Air cleaner. A heavy duty type air cleaner with a service indicator shall be furnished as recommended by the engine manufacturer for operation under severe dust conditions.