MIL-T-62276C
3.4.6 Driveline components. Driveline components shall be adequate to transmit the maximum delivered torque of the engine, as developed through the maximum gear train reduction.
3.4.7 Frame. The chassis frame shall be a reinforced or heavy duty type, capable of supporting the loads specified in 3.2.8 and 3.3.1.3. Reinforcement, when provided, shall extend at least from the rear of the front suspension rear hanger bracket to the bogie trunnion mounting bracket. A heavy duty frame shall have frame rails of greater section modulus than the manufacturer's standard for the class vehicle furnished and shall provide structural strength at least equivalent to the reinforced frame.
3.4.8 Suspension. The vehicle shall be equipped with a suspension system with components having a rated capacity at least equal to that specified in 3.2.6 and to the load imposed on each member, measured at the ground, with the vehicle loaded to specified GVW. When spring capacity is rated at the spring pads, unsprung weight shall be deducted.
3.4.9 Axles. Axle ratings shall be at least equal to those specified in 3.2.6 and to the load imposed on each axle, measured at the ground, with the vehicle loaded to specified GVW.
3.4.9.1 Rear and fourth axle Lubrication. The front and fourth axle wheal bearings shall be oil-lubricated. The oil type and viscosity shall be in accordance with the manufacturer's recommendations. The hub caps shall have windows for visual determination of the oil level. Provisions for venting and replenishing the oil supply shall be incorporated. The hubs shall be fitted with seals.
3.4.9.2 Rear bogie. The rear bogie shall be of the four-wheel type, complete with axles, springs, torque rods and all other necessary parts. The bogie shall be provided with means for permitting differential action between the two axles. A manually or automatically controlled lockout, assuring equal power to each rear axle, shall be provided. The manual lockout control used shall be located in the cab and shall be provided with a guard to prevent accidental actuation. A warning light for the lockout control shall be provided on the instrument panel. The rear bogie axle spacing, measured from the centerline of the forward rear axle to the centerline of the rear axle, shall be not less than 51 inches and not more than 55 inches. The rear bogie axles shall be of the one- or two-speed type, with the two-speed type equipped with electric, vacuum or air shift. Axles shall be provided with gear ratio(s) that will permit proper gear selection and the performance specified in 3.3.1 through 3.3.1.4. A temperature gage shall be provided for each bogie axle and shall be mounted on the instrument panel.
3.4.9.3 Fourth axle. The fourth axle shall be a spring up, air pressure down, self-steering, pusher type (dead) axle, mounted forward of the rear bogie. A lockout for the self-steering portion of the pusher axle shall be provided. With the fourth axle in the lowered position, the
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