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)

3.4.3.4 Neutral start switch. Neutral start switch for the transmission shall be furnished.

3.4.3.5 Speedometer drive outlet. A speedometer drive outlet for the transmission shall be furnished.

3.4.4 Drive line components. Drive line components shall be adequate to transmit the maximum delivered torque of the engine, or torque developed through the maximum gear reduction. Drive line shall be balanced to preclude vibration in conformance with the manufacturer's recommendation. Means shall be furnished to lubricate all bearings and journals without removing the drive line from the vehicle. Certify that the drive line is matched and rated for use in conjunction with interfacing components.

3.4.5 Frame. Chassis frame shall be furnished. The frame shall be manufacturer's standard for the vehicle furnished. Frame shall have sufficient structural strength and resisting bending moment to at least equal the loads imposed with the fifth wheel in its lowered position and in its maximum elevated position under the specified operating conditions with the vehicle loaded to specified GVWR and GCWR. In addition, the frame and its components shall be capable of meeting the transportability requirements specified in 3.1.1.4.2 and 3.5.1. Crossmembers, as a minimum, shall be provided rearward of the transmission and at the rear of the chassis frame. Chassis frame rails shall be cut-off immediately to the rear of the axle bracket or the frame crossmember closest to the rear of this bracket. In any case, the rearmost back face of the frame member shall not extend more than two inches past the rearmost back face of the tire. Back face of each frame member shall be provided with a dock bumper. Bumpers shall be easily removed for service.

3.4.6 Suspension. Vehicle shall be furnished with a front suspension system with components having a rated capacity at least equal to the dynamic and static loads imposed on each member, measured at the ground, with the vehicle loaded to the specified GVWR. The rear axle shall be resiliently mounted to the vehicle. The axle resilient mounting shall have a rated capacity at least equal to the dynamic and static loads imposed on each member, measured at the ground, with the vehicle loaded to the specified GVWR. Sufficient clearance shall be furnished between the vehicle frame and the inner tires. Vehicle shall be furnished with hydraulic double acting shock absorbers at the front axle. Sufficient clearance between shock absorbers and front brake components shall be furnished, when the shock absorber is extended to manufacturer's extended length.

3.4.7 Axles. Front and rear axles shall be furnished. Axle ratings shall be at least equal to the dynamic and static loads imposed on each axle, measured at the ground, with the vehicle