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

components shall be provided on all rotating parts. Bearing surfaces shall be adequate to resist torsional moment when inherent within the design. When completely closed booms are furnished, means shall be provided within the booms to absorb moisture. Booms shall be provided with inspection openings at critical areas. Booms wrapped for insulation purposes shall not be acceptable.

3.6.4.2 Boom travel of lower arm. The boom travel of the lower arm shall be a minimum of

80 degrees vertical to the body platform.

3.6.4.3 Boom travel of upper arm. The upper arm boom angular travel for type I vehicles shall be not less than 125 degrees. Upper boom range of angular travel between booms for

type II vehicles shall be not less than 200 degrees. Cable and sheaves, when furnished, shall be

compatible with each other and shall have sufficient structural strength to meet the performance requirements specified herein.

3.6.4.4 Boom operation. The rotating turntable and boom assembly shall be hydraulically actuated by separate mechanisms and shall operate independently, or in any combination of raising, lowering and rotating at the same time. When in combination, hand metering of the controls may be necessary. The boom(s) operating mechanism shall be capable of limiting the lifting capabilities from rest position within safe limits of design stress to prevent overloading. For testing purposes, means shall be provided in the hydraulic system to perform the overload tests. Upon completion of all testing, the hydraulic system pressures shall be adjusted to the manufacturer's recommended setting for the model vehicle furnished. The vehicle shall be inherently designed or provided with a device to prevent the booms from reaching a position that would cause the vehicle to become unstable.

3.6.4.5 Boom storage. For normal storage, travel and shipment of the vehicle, the booms shall fold to essentially horizontal positions in the vertical plane parallel to the longitudinal centerline of the vehicle. Means shall be provided to hold down the boom assembly and platform to prevent unactuated raising of the booms when in transit. Saddles and a tiedown device shall be provided to support and prevent vertical and side movement of the boom and basket assembly in transit. Boom saddles shall be sufficiently padded to prevent damage to the booms. Supports shall not interfere with entrance and exit of personnel to and from the body loadspace. Maximum stowed height shall conform to 3.2.9.

3.6.4.6 Boom cover(s). Boom cover(s) and means to retain cover(s) on insulated sections of the booms while in stowage or storage-in-transit position shall be provided. The cover(s) shall completely enclose the insulated arm(s). Provisions shall be made to stow the cover(s) in a compartment of the body.