OO-C-2868 Central Mix Plant, Concrete, Mobile 100 Cubic Yards \(77 Cubic Meters\) Per Hour CapacityThis specification covers a complete central mix concrete plant in a single mobile unit, electric-driven, with automatic controls, capable of producing not less than 100 cubic yards \(yd3\) or 77 cubic meters \(m3\) of concrete mix per hour when accompanied with a mobile mixer unit.

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OO-C-2868

to DoT Motor Carrier Safety Regulations. The kingpin shall conform to SAE

J700. Support jacks, legs, or braces shall be provided in sufficient number

and location to support the plant semitrailer unit in its operating position

when the semi-trailer is unhooked from the towing vehicle. Jacks, legs, and

braces shall be retractable or removable to preclude interference with travel

capabilities. Axle and suspension ratings shall be at least equal to the

imposed load. The plant semitrailer units shall conform to table I.

TABLE I.

Dimensions and clearances.

3.7.13 Tires and rims. The tire and rim ratings shall conform to TRA

Yearbook recommendations for the type and size of tires furnished. Tire and rim

sizes shall be the same for all wheels. Tires shall be tubeless type with

highway tread. Tires shall be or rated capacity at least equal to the load

imposed on each tire, measured at each wheel at the ground. Tires shall be not

less than 100 level quality and shall be of domestic make. Disc wheels are

required.

3.8 Toolbox. A toolbox shall be provided. The toolbox shall be large

enough to store all tools required for field service or maintenance, but shall

have external closed dimensions of not less than 14 inches (356 mm) in length, 6

inches (153 mm) in width, and 6 inches (153 mm) in height. The toolbox shall be

of nominal 0.0740-inch (1.88 mm) thick steel, with a hinged lid and a lockable

fastener to keep the lid secure. The toolbox shall be mounted in a protected,

accessible location.

3.9 Dissimilar metals. Intimate contact which can be expected to cause

galvanic corrosion shall be avoided. When such contact cannot be avoided, an

interposing insulating material shall be provided to minimize the corrosive

effect.

3.10 Lubrication. Means for lubrication shall be in accordance with the

manufacturer's standard practice. The lubricating points shall be easily

visible and accessible. Hydraulic lubrication fittings shall be in accordance

with SAE J534. Where use of high pressure lubricating equipment, 1,000

pound-force per square inch gauge or 6895 kilopascals (kPa) or higher, will

damage grease seals or other parts, a suitable warning shall be affixed to the

equipment in a conspicuous location.