Pressure Adjustment; Air Pressure; Calibrate The Correct Air Pressure; Water Pressure - Atlas Copco BBD 94W Instrucciones De Seguridad Y De Funcionamiento

Safety and operating instructions
Use Atlas Copco Rock Drill AIR-OIL which is
specially developed for BBC, BBD and RH pneumatic
Rock drills. Rock Drill AIR-OIL is readily
biodegradable according to OECD 301 and has high
film strength that can withstand heavy loads. If Rock
Drill AIR-OIL is not available use a mineral-based air
tool oil with the properties recommended in the table
below.
Temperature range (°C)
-30 to 0
-10 to +20
+10 to +50

Pressure adjustment

Air pressure

Ensure that the compressor can deliver the required
air pressure of 4–6 bar to the tool.
1. High pressure causes rough operation and
excessive wear.
2. Low pressure results in a slow drilling speed.

Calibrate the correct air pressure

Use the Atlas Copco (9090 0550 80) pressure gauge
to check the air pressure when the rock drill is
running. The pressure should be measured close to
the inlet nipple. Maximum allowed working pressure
is 6 bar.
The pressure gauge is equipped with a needle which
is pressed into the hose to measure the pressure
inside.

Water pressure

The water pressure must be at least 1 bar lower than
the air pressure otherwise water can enter the impact
mechanism. For example if the air pressure is 6 bar,
the water pressure must be below 5 bar to prevent
water entering the impact mechanism.
16
Viscosity grade (ISO
3448)
ISO VG 32-68
ISO VG 68-100
ISO VG 100-150
© 2010 Atlas Copco Construction Tools AB | No. 9800 0760 71a | 2010-01-01

Drill steel

WARNING Ejected insertion tool
If the tool retainer on the machine is not in a locked
position, the inserted tool can be ejected with force,
which can cause personal injury.
► Before changing the insertion tool, stop the
machine, switch off the compressed air supply
and bleed the machine by activating the start and
stop device.

Before fitting the drill steel

Check that the tool shank is of the correct size and
length for the chuck used. The shank must be clean
and the tool must be in good condition. Shanks which
are chipped, rounded, out of square or too hard on
the striking end will operate inefficiently and cause
premature piston failure.
Inspect the drill steel:
A dull drill steel will slow down the drilling speed and
overstrain the drill mechanism. When changing drill
steel make sure that the new one is the correct size
to follow your previous bore.
Before drilling, check that the flushing hole in the drill
steel is not blocked.
CAUTION Hot insertion tool
The tip of the insertion tool can become hot and
sharp when used. Touching it can lead to burns and
cuts.
► Never touch a hot or sharp insertion tool.
Wait until the insertion tool has cooled down before
►
carrying out maintenance work.
NOTICE Never cool a hot insertion tool in water, it
can result in brittleness and early failure.

Fitting the drill steel

Whenever fitting the drill steel the following
instructions must be observed:
BBD 94W, 94WE, 94WS
Original instructions