OO-R-2853 Roller, Motorized, Vibrating Drum, Articulated, Pneumatic Tire

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OO-R-2853

Vertical ending exhaust stack(s) when furnished, shall be

provided with rain cap(s) or curved end(s) providing protection from

water entry.

3.11.2 Transmission. The roller shall be driven by fully hydrostatic or

combination of hydrostatic and mechanical drive systems, providing power to both

the drum and the wheels simultaneously. The roller, with full hydrostatic drive

system, shall perform at any speed in either direction. A combination

hydrostatic and mechanical system shall provide not less than two speeds forward

and two reverse speeds. The roller shall be capable of operation at any speed

up to not less than 6 miles per hour (mph) (9.6 kilometers per hour (km/h)),

while traveling on a level paved surface. The roller, while in the travel-only

mode, shall be capable of negotiating a slope of not less than 17 percent, in a

straight vertical line.

3.12 Drum. Unless otherwise specified (see 6.2), the roller shall be

furnished with a smooth drum (see 3.12.1). The drum shall be fully

self-contained with vibratory mechanism, axle(s) and drive mounting devices.

Manufacturer shall ensure minimum disturbance to the hydraulic system during

conversion from smooth drum to tamping foot drum. The frum shall be fully

interchangeable on any roller furnished on single concract for the same type of

roller, and shall be designed so as to require not more than 4 hours labor time,

utilizing normal hand and power tools as contained in the average mechanic's

toolbox for this type of equipment, not including lifting and blocking devices

as may be required. Drum designed with internal vibrating features shall be

furnished as a complete assembly.

3.12.1 Smooth drum. The length and diameter of the frum shall be as

specified in table I. The drum shall have a smooth surface that is concentric

within 1/2 inch (12 mm) over the entire surface.

3.12.1.1 Sprinkler system. Unless otherwise specified (see 6.2), the roller

shall be equipped with manufacturer's standard water sprinkler system for

wetting the full width of the drum and the full width of the rear. The

sprinkler system shall as an minimum include: piping, fittings (nonferrous

material), controls, and water tank(s) to complete the system. Separate

controls shall be provided for the drum and the rear tires. The tank(s) shall

have a total capacity of not less than 150 gallons {560 liters (L)). The

tank(s) shall be equipped with vents and drain plugs that shall allow complete

drainage of water.

3.12.2 Tamping foot drum. When specified (see 6.2), the roller shall be

furnished with a tamping foot drum. The tamping foot drum shall have length

and diameter as specified in table I, when measured from the floor level, to

maximum surface of compaction pads. The quantity and type of tamping feet

provided on the drum shall be the manufacturer's standard design.

3.12.3 Drum cleaner. Replaceable and adjustable drum cleaners shall be

provided. The cleaners shall extend over the full length of the drum for smooth

drums and between feet for the tamping foot drums. Drum cleaners shall prevent

accumulation of material an the drum when the roller is propelled in either the

forward or reverse direction.