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

3.4.10.6 Tire chain clearance. Tire chain clearance in accordance with SAE J683 shall be provided. Allowance for spring deflection shall be included.

* 3.4.11 Brakes. The brakes shall be in accordance with Federal Motor Carrier Safety Regulations 393.40 through 393.43, and 393.45 through 393.52. Brake linings shall be of nonasbestos material.

* 3.4.11.1 Power hydraulic type brakes. Unless otherwise specified (see 3.4.11.2 and

3.4.11.4), class A and class B, model 4x2 vehicles shall be equipped with power assisted, hydraulic actuated, four-wheel service brakes.

3.4.11.2 Full air type brakes. Model 4x4 and 6x4 vehicles and model 4x2, class C, D, E vehicles and, when specified (see 6.2), class A and class B, model 4x2 vehicles shall be equipped with full air brakes on all wheels. The braking system, complete with all necessary components, shall include:

(a) Air compressor, unloader-head type, engine driven and engine lubricated, air or water-cooled, and having a capacity of not less than 205 l/min (7.25 cubic feet per minute (cfm)) for model 4x2 and 4x4, and not less than 340 L/min (12 cfm) for model 6x4

(b) Air storage reservoir(s); each tank equipped with a draincock and with safety and check valves between the compressor and the last reservoir tank

(d) Air control valves

(e) Air pressure gage, visible to the driver

(f) Low air pressure warning, visible and audible

(g) Service brake stop lamp switch

(h) Automatic moisture ejector

(i) Automatic slack adjusters (model 4x2 and 6x4 only).

* 3.4.11.3.1 Air dryer. A replaceable cartridge desiccant type air dryer shall be installed in the air brake system. The dryer shall have the capability of removing not less than 95 percent of the moisture in the air being dried. The dryer shall have a pre-cooler and a filter to screen out oil

and solid contaminants. The dryer shall have an automatic self-cleaning cycle and a

thermostatically controlled heater to prevent icing of purge valve.

* 3.4.11.4 Trailer brake control system. When specified (see 6.2), a trailer brake control system shall be furnished in addition to the components specified in 3.4.11.2. When a trailer brake control system is specified, class A and B vehicles also have an air brake system in lieu of hydraulic brakes. The trailer brake control system shall include:

(a) Identification of emergency and service lines

(b) Coincident control of trailer brakes with prime mover foot control