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)

3.5.4 Grating plate. A steel walkway grating plate shall be furnished. The plate shall cover the area forward of the hydraulic fifth wheel assembly; width of the frame and the fuel tank. The plate shall be secured with corrosion resistant hand operated toggle clamps to facilitate maintenance of the fuel tank(s) and areas below the plate. The plate shall be located as close to the back of the vehicle cab as possible and extend rearward to the maximum length practicable. When a step fuel tank is provided, the top of the tank inward of the tank outlet fittings that are

not protected, shall be provided with removable guards to preclude damage to tank fittings. Guards may be secured if fittings are accessible for service. Provisions to allow access of personnel climbing onto the plate from the sides of the vehicle cab shall be provided. Access holes with grommets, located for maintenance of fittings and other components shall be furnished. The plate shall be of sufficient structural strength for the use intended. The plate toggle clamps shall be bolted, and not welded, to any chassis frame member.

3.5.5 Elevating hydraulic fifth wheel. When specified (see 6.2), an elevating hydraulic fifth wheel shall be furnished. The fifth wheel shall be capable of elevating from down position to elevating position at least 31 inches, and from ground level at least 79 inches. The elevating fifth wheel shall meet the requirements specified in 3.5, 3.5.1, 3.5.2 and 3.5.3.

3.6 Servicing and adjusting. Prior to acceptance of the vehicle by the Government Inspector, contractor shall service and adjust each vehicle for operational use including at least the following: Focusing of lights, adjustment of the engine, electrical 12 and 28 volt system, and power plant heaters; and brake system; filling and charging of battery; alinement and balancing

of the front wheels; inflation of all tires; cycling the fifth wheel assembly through its entire range of elevations; complete lubrication of chassis, engine and running gear, fifth wheel plate and the kingpin activating mechanism with grades of lubricants recommended for the ambient air temperature at the delivery point; servicing of cooling system with a solution of ethylene glycol and water in equal parts by volume; servicing of windshield washer reservoir with water and appropriate additives; visual inspection to verify that no accessory or component will interfere with any other accessory or component under dynamic conditions; and that all fasteners are in place and torqued for their respective size.

3.7 Safety. All equipment, or exposed portions of the equipment which are subject to extreme temperatures; rotating or reciprocating parts which are of such a nature or so lubricated as to become a hazard to operating personnel, shall be insulated, fully enclosed or properly guarded.