Reg. code
AIB TAB 43
COP 1638
2007–08
Maintenance instructions for
Hydraulic
Rock drill COP 1638
1250 0021 33
ATLAS COPCO ROCK DRILLS AB
ÖREBRO · SWEDEN
© Atlas Copco Rock Drills AB, 2007. All rights reserved.
No. 9852 1653 01c
SAFETY REGULATIONS
·
Important safety information is given at various points in these instructions.
·
Special attention must be paid to the safety information contained in frames and accompanied by a war-
ning symbol (triangle) and a signal word, as shown below:
indicates hazards or hazardous procedures which COULD
result in serious or fatal injury if the warning is not observed.
indicates hazards or hazardous procedures which COULD
result in injury or damage to equipment if the warning is not
observed.
The following safety rules must also be observed:
·
Carefully read through all operating- and main-
tenance instructions for the drill rig and rock
drill before putting the rock drill to use. Always
follow the instructions given.
·
Do not use or intervene in the rock drill unless

made while the drill rig is in operation must be
carried out by at least two persons. One per-
son must man the control station and keep a
strict watch over the work.
·
To prevent injury during service and mainte-
nance, all components that could possibly
move or drop must be supported safely on
blocks or trestles, or secured by means of
adequately dimensioned slings.
·
Before starting work on any of the systems,
make sure that the hydraulic, air and water sys-
tems are without pressure, and that the electri-
cal system is dead.
·
Check that the hoses used are of the right qua-
lity, and that all hose connections are in good
condition and properly tightened.
WARNING
CAUTION
Contents Page
Safety regulations . . . . . . . . . . . . . . . . 2
Action list . . . . . . . . . . . . . . . . . . . . . 3
Hose connections . . . . . . . . . . . . . . . . 4
Tightening torques . . . . . . . . . . . . . . . . 5
Accumulators . . . . . . . . . . . . . . . . . . 6
– Charging the accumulators . . . . . . . . . . 6
– Checks in the event of hose vibration . . . . . 7
– Changing the accumulators . . . . . . . . . . 8

·
Check that air and lubricating oil come out
between the shank adapter and front guide
and also out of the hole in the front head . . 13
·
Check that the damper-pressure gauge on
the drill rig shows the normal value. In case
of deviation, adjust the damper pressure . . . 11
·
Check that the shank-adapter threads are
not damaged . . . . . . . . . . . . . . . . . 13
·
Keep an eye on the hydraulic hoses. If they
vibrate too much, check the accumulators . . 7
·
Check that there is no leakage from the rock
drill. If the flushing medium leaks out of the
overflow hole in the front head, change the
seals and O-rings . . . . . . . . . . . . . . . 13
·
When changing the shank adapter or remov-
ing the front head, check the internal compo-
nents, including the visible parts of the piston,
driver and rotation chuck bushing . . . . . . 13
In the event of defect, remove to a suitable
workshop for repair or replacement.
After the first shift when using a
new- or newly overhauled rock drill
·
Tighten all threaded unions . . . . . . . . . 5

– front head parts
– accumulators
– hydraulic motor
– screws
– connections.
Other repairs must be carried out in a sui-
table workshop in accordance with the
WARNING
·
Before starting any maintenance work,
make sure that the electrical system is
dead.
There is a risk of injury if these instructions
are not observed!
CAUTION
·
Take care during rod jointing and when
handling the drill bit. Mind your fingers!
·
Keep your clothing away from rotating
machine parts.
Carelessness can lead to serious injury.
·
Always use ear protectors during drilling.
High noise levels damage hearing.
·
Never attempt maintenance or intervene
in the rock drill, connections or hoses whi-
le the hydraulic, lubrication or flushing
systems are pressurized.

systems are pressurized.
Air or oil can squirt out at high pressure
and high temperature, with the risk of
serious injury to the eyes and skin.
·
Pressure hoses with an internal diameter
of 19 mm (3/4") or more are rated SAE 100
R9R (i.e. high-pressure hose with four lay-
ers of spirally wound steel-wire reinforce-
ment). See spare parts list for drill rig.
For safety reasons, these hoses must not,
under any circumstances, be replaced
with hoses of a lower rating.
There is a risk of injury if these instruc-
tions are not observed!
1250 0147 23
1
8
7
2
3
4
5
6
AIR
4
Tightening torques
N.B. Tighten item Nos. 1–3 in the prescribed order.
Ref.No. Qty. Check point Torque Instructions
Nm lbf.ft

9
13
3
14
3
2
5
Accumulators
The accumulators are fitted with safety labels as
shown in the figure below.
1. Damper accumulator
2. Intake accumulator
3. Return accumulator
4. Protective cap
5. Valve nut
6. Gas valve
Charging the accumulators
1. Remove the protective cap (4).
2. Open the valve nut (5) by 2–3 turns, and con-
nect the gas hose.
3. Open the gas valve (6).
4. Charge the accumulators to the correct
pressure, as follows:
– Damper accumulator (1): 20–25 bar
(290–360 psi)
– Intake accumulator (2): 30- 40 bar
below the collaring pressure
(435 - 580 psi)
5. Tighten the valve nut (5) and close the gas val-
ve (6).

2
0
5
2
R
AB
0
0
0
1
0
5
1
0
0
2
0
5
2
R
A
B
0
0
0
1
0
5
1
0