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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62

MIL-T-62518A

ground, shall be provided. When an air compressor is specified (see 3.6.19.9), the hydraulic pump and the air compressor shall be driven by an auxiliary engine. Chain drives shall not be used in any system.

3.6.8.5 Hydraulic fluid reservoir. A hydraulic fluid reservoir shall be provided, with sufficient capacity to hold the required volume of hydraulic fluid, with not less than 10 percent for expansion space. The reservoir shall be baffled and suction and reservoir ports shall be located as necessary to ensure thorough mixing of hot return oil and as necessary to prevent foaming oil from entering the hydraulic system suction port. The reservoir shall be provided with a filler opening, a removable fill opening oil strainer and a vented filler cap, situated in an accessible location to facilitate filling the tank from a one-gallon container using a funnel. The vented filler cap shall have means to prevent fluid from splashing out of the tank during movement of the vehicle. The filler cap shall be attached to the tank by a corrosion-resistant chain or cable. Provision shall be made for inspection and cleaning of the interior and for draining the reservoir. The reservoir drain shall be located so that fluid will not drain on other components and shall allow recovery of the fluid in a container. The reservoir shall have a corrosion-resistant plate to indicate the type of hydraulic fluid furnished and the maximum fluid level in the reservoir with the booms folded for travel and the hydraulic lines and components full of fluid. A sight level or dipstick gage shall be furnished to observe the level of fluid. The tank shall be clean.

3.6.8.5.1 Hydraulic fluid. Unless otherwise specified, hydraulic fluid conforming to the manufacturer's standard or recommended requirements shall be provided in the hydraulic system. When specified (see 6.2), hydraulic fluid conforming to MIL-H-83282 shall be provided in the hydraulic system.

* 3.6.8.6 Oil filter and strainers. A full-flow type, 10-micron discharge oil filter in the return line to the reservoir or in the pressure line immediately after the pump shall be provided. A

100-mesh line strainer shall be provided on the auction aide of the hydraulic system. The filter and the auction strainer shall be easily accessible for periodic cleaning, or for replacement of the

filter cartridge. The filter and the strainer shall have sufficient capacity to allow the pump to deliver maximum rated flow.

3.6.8.7 Hydraulic fluid temperature. The hydraulic fluid temperature shall be maintained within safe limits to prevent seal damage or approach to the flash point of the hydraulic fluid during all operating conditions of the vehicle and use of the aerial tower hydraulic system for long periods of time. Excessive heating of the fluid (more than 13°C (55°F) above ambient in an ambient of 52°C (125°F) shall be unacceptable under any operating condition. Provisions shall be made to prevent malfunction or unactuated operation of the hydraulic control system due to changes in fluid temperature.