MIL-S-28566C(YD)
3.9.5 Broom and blower drive. The broom and blower shall be driven either by
means of mechanical (chain and sprocket) or by hydrostatic drive, powered from
the sweeper engine. Drive shall be commercial standard type adequate for the
intended purpose. The drive shall be arranged to operate the broom and blower
independently or simultaneously. When a hydrostatic drive is supplied, it shall
When the drive is of the chain and
be of the hydraulic closed-loop system.
sprocket type, it shall be enclosed in an oiltight case. Adequate means shall
be provided for chain takeup to provide for chain and sprocket wear. All chains
and sprockets shall be adequately guarded. The engine shall be equipped with a
heavy duty over-center type clutch power takeoff or other adequate means for
engagement and disengagement of the blower and rotary broom.
3.9.6 Rotary broom assembly. The rotary broom shall be 14 feet in minimum
length and 36 inches in diameter and as an assembly shall consist of fillers
and mounting devices mounted on a power driven core assembly. The diameter of
the core shall be maintained for the full length around the true center within
the specified tolerance of plus or minus 1/64 inch. The core shall be balanced
in accordance with industry standard practice. Provisions shall be made to
permit removal of one (or both) broom core and plate(s). Unless otherwise
specified (see 6.2), the broom material shall be synthetic, mounted on the steel
core.
3.9.6.1 Broom hood. The broom hood shall keep snow and debris picked up
by the broom from being thrown back on the sweeper and swept area. The hood
shall be constructed of sheet steel. The hood shall cover the upper section of
the broom and incorporate a front deflector. The deflector shall be hinged
and adjustable to assume the proper discharge of dirt and snow, and facilitate
easy removal. of the broom. The broom hood shall be automatically adjusted to
maintain uniform broom clearance as broom wears. This adjustment shall be
automatically accomplished with the adjustment for broom sweeping pattern as
broom tufts wear.
3.9.6.2 Casters. Two heavy-duty casters with pneumatic tires shall be
mounted on the broom frame in such a manner that they will always travel in
the swept path. The vertical center line of the caster pin shall remain
perpendicular to the ground thru the total broom adjustment. The caster
wheels shall be free to swivel a full 360° and shall be equipped with
anti-shimmy devices. The complete caster assembly shall be easily removable for
replacement. The pneumatic tires and rims shall be in accordance with TRA
recommendations.
3.9.6.3 Broom adjustment. Sweeper shall incorporate a hydraulic system
for raising, lowering, and angling the broom. A crank-operated adjustable
stopper be built into the broom lifting cylinder. It shall be possible to
adjust the broom pattern hydraulically by means of push button controls on the
control panel (see 3.9.10), and also by a control switch located on the main
sweeper frame adjacent to the broom, then locked in position by the adjustable
stopper. The adjustment shall be sufficient to allow up to 9 inches of broom
wear. Raising and lowering the broom assembly shall not affect the preset
broom pattern on the runway surface. The broom shall be capable of being
angled right or left.
3.9.7 Hydraulic system. The hydraulic system shall consist of hydraulic
cylinder, pump, reservoir, valves, controls, and required plumbing. The pump
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