MIL-T-62518 Trucks, Maintenance: With 9 To 37 Meters 30 To 120 Foot Multi-Position Aerial Platform, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two-rear-wheel drive; four-wheel, four-wheel drive; and six-wheel, four-wheel-drive trucks having minimum gross vehicle weights GVW of 6800 kilograms kg 15,000 to 22 700 kg 50,000 pounds, equipped with maintenance bodies and 9 to 37 meters m 30 to 120 foot multi-position, articulating, boom type aerial platforms. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62518A

sufficient structural strength in the chassis frame through increased bending moment to at least equal the loads imposed with the vehicle body loaded to provide the specified GVW.

3.4.8 Suspension. The vehicle shall be equipped with a suspension system with components having a total rated capacity per axle at least equal to that specified in 3.2.6. The vehicle shall be equipped with hydraulic, double-acting shock absorbers at the front wheels. Suspension system ratings shall be adequate for the loads imposed during all conditions of operation of the aerial equipment.

* 3.4.9 Axles. Axle ratings shall be at least equal to that specified in 3.2.6. Gear ratio(s) shall provide performance specified in 3.3.1 through 3.3.1.3. Except for the front axle or model 4x4 vehicles, the wheel bearings and axle spindles shall be oil lubricated. The hubcaps, except for driving axles, shall have a window for visual determination of oil level. Provisions for venting

or withstanding internal pressure buildup and for replenishing the oil supply shall be provided.

3.4.9.1 Rear bogie. The rear bogie on model 6x4 vehicles 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 permitting differential action between the two axles, and a manually or automatically controlled lockout assuring equal power to each rear axle. The manual lockout control used shall be located in the truck cab. Axle gear ratios shall provide performance specified in 3.3.1 through 3.3.1.3.

3.4.9.2 Two-speed axles. When specified for model 4x2 and 6x4 (see 6.2), a two-speed axle(s) shall be furnished. The axles shall be equipped with electric, vacuum, or air shift and shall be provided with ratios which will permit proper transmission gear splitting. Gear ratios shall provide performance specified in 3.3.1 through 3.3.1.3.

3.4.9.3 Traction control. When specified (see 6.2), the vehicle shall be furnished with a traction control on the rear axle for model 4x2 and 4x4 vehicles and on either rear axle for model

6x4 vehicles. The traction control shall actuate automatically to insure that power is transmitted

to the wheels having traction when the opposite wheel loses traction. Maximum traction capabilities shall be maintained at all times under each drive wheel for the life of the vehicle.

* 3.4.10 Wheels, rims, tires and tubes. Unless otherwise specified, the vehicle shall be equipped with single front and dual rear wheels. Rims and tire ratings shall conform to The Tire and Rim Association or European Tyre and Rim Technical Organisation recommendations for the type and size of tires furnished. Except when tube type tires are specified in the procurement documents, multi-piece rims shall not be furnished on front axles rated at 6350 kg

(14,000 pounds) or less and on single rear axles rated at 10430 kg (23,000 pounds) or less or