Installation
Hoses and connections
A. Compressed air source
B. Water separator (optional)
C. Lubricator (optional)
D. Max. 3 m (10 ft) compressed air hose between
the lubricator and the machine.
◆
Check that you are using the correct
recommended operating pressure, 6 bar (e) (87
psi).
◆
The maximum permissible air pressure, 7 bar
(e) (102 psi), must not be exceeded.
◆
Blow any impurities out of the compressed air
hose before connecting it to the machine.
◆
Select the correct dimension and length for the
compressed air hose. For hose lengths up to 30
m (100 ft), a hose with a minimum internal
diameter of 19 mm (¾ in.) must be used. If the
hose length is between 30 and 100 m (100 and
330 ft), a hose with a minimum internal
diameter of 25 mm (1 in.) must be used.
Methods to prevent freezing
Ice formation in the silencer can occur when the
ambient air temperature is 0–10°C (32-50 °F) and
the relative humidity is high.
The machine is designed to avoid the formation of
ice in the silencer. Despite this, under extreme
conditions ice can form in the silencer.
Take the following actions to further counteract the
risk of ice formation:
◆
Use Atlas Copco Rock Drill AIR-OIL as a
lubricant.
◆
Use VAM 5A water separator.
If the rock drill freeze, never heat it to melt the ice.
Always let the ice thaw at room temperature.
Never pour methylated spirits or similar substances
into the rock drill, as they will interfere with the
lubrication and lead to increased wear.
Connecting a water separator
The length of the air hose between the compressor
and the water separator must be such that the
water vapor is cooled and condenses in the hose
before reaching the water separator.
If the ambient temperature is below 0°C (32°F) the
hose must be short enough to prevent the water
from freezing before reaching the water separator.
Lubrication
The rock drill is lubricated with oil mixed with
compressed air, which is taken to the parts that
need continuous lubrication. Oil is metered into the
compressed air using an Atlas Copco BLG 30 or
CLG 30 lubricator connected to the air line.
Use Atlas Copco Rock Drill AIR-OIL which is
specially developed for BBC, BBD, RH and SRD
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
(°F)
Viscosity grade (ISO
3448)
-30 to 0 (-22 to +32) ISO VG 32-68
-10 to +20 (+14 to +68) ISO VG 68-100
+10 to +50 (+50 to +122) ISO VG 100-150
Pressure adjustment
Air pressure
Ensure that the compressor can deliver the
required air pressure of 4–6 bar (58 – 87 psi) to the
machine.
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. Recommended operating
pressure is 6 bar (87 psi).
SRD 20, 25 Safety and operating instructions
© Construction Tools PC AB | 9800 1883 01 | 2017-05-31
Original instructions
13
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