Atlas Copco BBD 94W Bedienungsanleitung Seite 3

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Atlas Copco BBD 94W/95W rock drills are water
flushed and intended for air pressures of 4–6 bar.
The machines are intended to be used together
with the ALF 72D, ALF 67/80D or BMK 62S
pusher legs.
The BBD 94W has a cylinder of light metal with a
replaceable cylinder liner of steel. Flushing is duc-
ted through two concentric tubes, the outer one for
air and the inner one for water.
This means that flushing air is provided as soon as
the compressed air is switched on. The purpose is
to prevent water from entering the percussion
mechanism of the rock drill.
The BBD 95W is the same as the BBD 94W, ex-
cept that it has a cylinder and cylinder liner of pa-
tented noise-damped design.
As standard, the rock drills are equipped with a
chuck bushing for 22 mm x 108 mm hexagonal
shanks. They can also be obtained with chuck bus-
hings for other shank sizes.
All machines are equipped with a 25 mm connec-
tion for air and a 12.5 mm connection for water.
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The rock drills are equipped with a throttle lever for
regulating both the compressed air to the percus-
sion mechanism and the flushing water.
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Adjust the feed force by means of the feed control
knob as follows:
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When the feed control knob is in the closed posi-
tion (A), the pusher leg is vented.
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When the valve pin is pushed in, the feed force
ceases abrubtly, thus overriding the setting on the
feed control knob. The facility is used, e.g. to ad-
just the height of the rock drill, when rigging up the
pusher leg, or when there is a tendency to jam.
When the valve pin is depressed, the piston rod in
the pusher leg is retracted automatically.
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Remove the plastic guards from the rotation chuck,
hose nipples and exhaust outlet. Save the plastic
guard for the rotation chuck, and re-insert it if the
machine is put aside for storage.
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Always blow clean the hoses before connecting
them to the rock drill. When a new machine is star-
ted, it is important that lubrication is effective right
from the start. This can be ensured by pouring app-
rox. 10 cl of oil directly into the machine air intake
before connecting the hose.
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The pusher legs must be fixed to the rock drill by
means of the bayonet coupling shown in fig. 3.
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1. Check that all of the drilling equipment is in
good working order.
2. Check that the impact surface of the drill-steel
shank is flat, with no signs of wear.
3. Check that the flushing holes in the drill steel
and drill bit are not blocked, and that the flus-
hing air/water flows through without obstruction.
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4. Fill the lubricator with oil.
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