MIL-S-18141 Sweeper, Rotary, Towed \(S/S By A-A-55544\)

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MIL-S-18141J

3.10 Operating and storage temperature. Sweeper shall operate

satisfactorily when exposed to temperatures ranging from -25� Fahrenheit (F) to

+120�F. Sweeper shall be capable of withstanding prolonged storage in

temperatures ranging from -65�F to +160�F.

3.11 Components.

3.11.1 Frame. Sweeper frame shall be of welded structural or tubular steel

construction, and shall be of sufficient strength to withstand permanent

distortion or damage when tested in accordance with 4.3.3. Bolt-on provisions

shall exist for the installation of the contractor's sprinkling system kit

without any additional cutting, welding, or fabrication of parts by the user.

3.11.2 Brush and brush mounting. The brush shall be cylindrical shape, not

less than 30 inches in diameter, and not less than 95 inches long. The brush

shall be mounted on a full length shaft carried by self-aligning ball or roller

bearings. The brush shall be reversible and refillable. Unless otherwise

specified (see 6.2), the brush shall be filled with synthetic fiber held in

place on a core by means of a spiral type coil fitted into steel channels on the

core, or by individual brush sections, wafers, or rings which catch on the core,

or by individual strips of brushes slid into longitudinal slots on the core, or

by steel cable or wire rope at least 3/16-inch diameter. A flange shall be

provided on each end of the brush to prevent entanglement of bristles in the

drive mechanism. The brush mounting shall permit brush removal, reversal, and

reinstallation by one man in not more than 30 minutes without the use of special

tools . When specified (see 6.2), a core loader of brush manufacturer's standard

design shall be furnished.

3.11.3 Brush operation. Brush operation shall be mechanical or hydraulic.

The vertical brush movement shall be balanced by means of an adjustable spring

or counterbalance weight, or shall be controlled by means of suitable adjustable

load supporting casters. The vertical height of the brush shall remain at the

preselected setting during operation, with means provided for adjusting the

vertical height through the range required to compensate for brush bristle wear.

A separate safety locking device shall be provided to hold the brush in the

raised position.

3.11.3.1 Mechanical operation. The brush drive shall be by chain and

sprockets or gears. Drive chains shall have provisions for tension adjustment.

The machine cut gears and sprockets shall be of high strength alloy steel,

renewable, and reversible whenever practicable. Brush lifting and lowering

shall be accomplished by a hand lever operated hydraulic pump ram, and

connecting lines. The vertical brush movement shall be balanced by springs,

with provision to adjust the spring tension. A manually operated clutch shall

be provided between engine and brush drive.

3.11.3.2 Hydraulic operation. The hydraulic operation system shall consist

of a hydraulic pump driven by engine power takeoff, hydraulic motor for brush

drive, oil reservoir, connecting lines, and control valve for raising, lowering,

and operating the brush. The hydraulic system shall be of the closed type, with

a full flow, 35 micron maximum particle size, return oil filter.

3.11.4 Hood. A full-length hood, with ends, shall be mounted over the

brush. The hood shall cover at least 40 percent of the brush circumference.