Atlas Copco Secoroc 7655 User manual

Secoroc 76 Series Rock Drill
Secoroc 7655/7655D Pusher Leg Rock Drill
Operator's instructions / Spare parts list
Secoroc Rock Drilling Tools

2
Foreword
Thank you for selecting the Secoroc pusher leg rock drill 7655/7655D.
These instructions were developed to help you get the best performance and
productivity from the use of your new rock drill.
Please refer to them also for the correct maintenance of the rock drill.

3
Table of Contents
Scope of application ................................................... 4
Specification ....................................................... 4
Safety instructions..................................................... 5
Operation ............................................................ 6
Using the rock drill for the first time.................................... 6
Preparations before starting .......................................... 6
Fitting and removing the drill steel..................................... 7
Before fitting the drill steel .........................................7
Fitting the drill steel ...............................................8
Removing the drill steel............................................8
Attaching the pusher leg to the rock drill ................................ 8
Controls ........................................................... 9
Throttle lever.....................................................9
Feed control .....................................................9
Trigger.........................................................10
Oil regulating valve ..............................................10
Drilling ........................................................... 11
Starting the rock drill .............................................11
Stopping the rock drill ............................................11
Checking the lubrication ..........................................11
Re-positioning the pusher leg .....................................11
Blow-cleaning the drill hole........................................11
When you have finished drilling ....................................12
Maintenance ...................................................... 12
Once a shift (after 8 hours of operation) .............................12
Once a week (after 40 hours of operation) ............................12
Once a month (after 200 hours of operation)..........................12
Selection of spare parts ............................................. 13
Storage .......................................................... 13
Scrapping and waste disposal ....................................... 13
Trouble shooting ..................................................... 14
Spare parts list and exploded drawing ................................... 16

4
Scope of application
Model 7655 is a highly efficient rock drill. It is mainly used in either rock drilling
work such as mining and tunneling, or in railway, water conservancy construction
projects and stone work. It is suitable for wet drilling on hard and medium hard
rock, or for drilling horizontal or inclined blast holes. 7655 can be equipped with
pusher leg FT160A and FY200A lubricator.
Model 7655D is a low energy consumption rock drill based on model 7655. It has
good performance at low air pressure, with long air lines or powered by small sized
air compressor. 7655D is mainly used in the same applications as the 7655. It can be
equipped with pusher leg FT160A and FY200A lubricator.
Specification
Pneumatic rock drills 7655 and 7655D
7655 7655D
Weight 24 24 kg
Dimension (L x W x H) 628 x 232 x 207 668 x 232 x 202 mm
Cylinder diameter 76 70 mm
Piston stroke 55 70 mm
Minimum working pressure 3 3 bar(e)
Impact energy (at 6.3 bar (e)) ≥65 ≥65 J
Impact energy (at 5.0 bar (e)) ≥59 ≥57 J
Impact energy (at 4.0 bar (e)) ≥42 ≥44 J
Air consumption (at 6.3 bar (e)) ≤80 ≤80 l/s
Air consumption (at 5.0 bar (e)) ≤54 ≤52 l/s
Air consumption (at 4.0 bar (e)) ≤50 ≤45 l/s
Impact frequency (at 6.3 bar (e)) ≥37 ≥32 Hz
Impact frequency (at 5.0 bar (e)) ≥36 ≥31 Hz
Impact frequency (at 4.0 bar (e)) ≥34 ≥30 Hz
Torque (at 6.3 bar (e)) ≥18 ≥18 Nm
Torque (at 5.0 bar (e)) ≥15 ≥15 Nm
Torque (at 4.0 bar (e)) ≥12 ≥12 Nm
Water pressure working pressure -1 working pressure -1 bar(e)
Air hose inner diameter 25 19 mm
Water hose inner diameter 13 13 mm
Drilling diameter 34–42 34–42 mm
Max drilling depth 5 5 m
Working temperature -30 to +50 -30 to +50 ºC
Shank size H22x108±1 H22x108±1 mm
Noise level ≤125 dB(A)
Lubricator FY200A
Weight 1.2 kg
Capacity 0.2 litre

5
Safety instructions
To reduce the risk of serious injury or death to yourself or others, carefully read
through this instruction booklet before putting the rock drill to use. Always follow
the instructions given in this manual.
hAlways wear a safety helmet, impact resistant eye protection with side protection
and ear protectors with CE mark during drilling. Any local regulations that exist
must also be observed.
hWhen drilling in certain minerals, there is a risk of spark generation. Before
starting work, check that the machine is approved (in accordance with local
regulations) for work under such conditions.
hAlways take great care when using the machine. The drill steel is subjected to
heavy loading and can break, with a risk of injury to personnel.
hCheck that the hoses used are of the right quality, and that all hose connections
are in good condition and properly tightened.
hBefore starting work on any of the systems, make sure that the air and water
systems are without pressure.
hMake sure that there are no concealed wires or other sources of electricity. Never
drill near any electric wires or other sources of electricity.
hExposure to crystalline silica (sometimes called 'silica dust') as a result of drilling
in rock may cause silicosis, cancer or death. Never operate the rock drill without
water flushing.
hA compressed air hose that comes loose can lash around and cause personal
injury or death. Check that the compressed air conections are not damaged and
that they are properly attached.

6
Operation
Using the rock drill for the first time
When the rock drill arrives from the factory, the inside of the machine is coated with
heavy oil to prevent corrosion.
After unpacking and installing the machine, pour a small amount of lubrication
oil into the air connection and operate the machine on partial throttle to clean the
interior. Follow this immediately with a liberal amount of air tool oil.
The rock drill and pusher leg are 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 the FY200A lubricator connected to the air line.
Preparations before starting
1. Check the drilling equipment
hCheck that all of the drilling equipment is in good working order.
hCheck that the impact surface of the drill steel shank is flat with no signs of wear.
hMake sure that the air inlet and exhaust ports are free from obstructions.
hCheck that the flushing holes in the drill steel and drill bit are not blocked and
that the flushing air/water flows through without obstruction.
hEnsure that the fittings are tight and leak-proof.
WARNING
A compressed air hose that comes loose can lash around and cause personal injury or
death. Check that the compressed air conections are not damaged and that they are
properly attached.
2. Blow out the air hose
Every day before using the drill, blow out the air hose to clear it from accumulated
dirt and moisture.
3. Check the lubrication oil level
hFill the lubricator with oil if necessary.
hAlways use a recommended lubricant.
Lubricant recommendation
Use a mineral-based air tool oil
Ambient
temperature ºC
Viscosity grade
(ISO 3448)
-30 to 0 ISO VG 32-68
-10 to +20 ISO VG 68-100
+10 to +50 ISO VG 100-150

7
4. Air/water pressure and hose dimensions
Air pressure
Ensure that the compressor can deliver the required air pressure of 5 bar at the
machine.
hHigh pressure (>6.3 bar) causes rough operation and damage.
hLow pressure (<4 bar) results in a slow drilling speed.
Water pressure
Set the water preassure to around 3 bar. Maximum water pressure is 1 bar less
than the working pressure. For example if the air pressure is 5 bar, the water
pressure must be below 4 bar to prevent water entering the impact mechanism.
Air hose dimensions
The air hose diameter for model 7655 must be no less than 25 mm and no less than
19 mm for model 7655D. The inner diameter of connection nipples and hoses must
be no less than 19 mm. The ideal overall air hose length is less than 15m.
Water hose dimensions
The water hose inner diameter for model 7655 and 7655D must be no less than ½".
5. Prevent freezing
In low ambient temperatures, ice can form in the machine. This can be avoided if
the water in the compressed air is removed. This can be done by equipping the air
lines with water separators and drainage points for water condensate.
If the rock drill ices up, it must not be heated to melt the ice. Let the ice thaw at
room temperature.
Do not pour methylated spirits or similar substances into the rock drill, as they will
interfere with the lubrication and lead to increased wear.
Fitting and removing the drill steel
Before fitting the drill steel
hCheck that the drill steel shank is of the correct size and length for the chuck
used.
hThe shank must be clean and the drill steel must be in good condition.
hThe suitable quenching hardness of the shank is HRC48-53. A harder end face will
cause piston damage and breakage of the end face of the piston. If the shank face
is too soft it will be easily deformed by the piston which will result in difficulty in
removing the drill steel.
hThe shank end face shall be flat and perpendicular to the axis.
hRemove sharp edges from the shank's end face. A rough shank surface will cause
premature piston failure.
hInspect 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.

8
hBefore drilling check that the flushing hole in the drill steel is not blocked.
Fitting the drill steel
1. Push the retainer outwards in the direction of the arrow (see picture below),
until the front portion of the retainer is able to accommodate the drill steel
collar.
2. Insert the drill in the chuck.
3. When the drill bottoms, push back the retainer to lock it.
Removing the drill steel
1. Push the retainer outwards in the direction of the arrow until the drill steel
collar disengages from the front of the retainer.
2. Pull the drill steel out.
3. Push back the retainer.
Attaching the pusher leg to the rock drill
hMount the pusher leg (1), lock sleeve (2), rubber pad (3), washer (4) and locking
nut (5) in the order shown in the picture below.
hTurn the locking nut clockwise with a wrench until you hear a "click".

9
Controls
Throttle lever
The rock drill is equipped with a throttle lever for regulating both the compressed
air to the percussion mechanism and the flushing water.
A. Extra blowing, water flushing off, impact and rotation off.
B. Stop position, air and water off
C. Low throttle, air to pusher leg, water flushing
D. Medium throttle
E. Full throttle
Feed control
Adjust the feed force using the feed control lever.
A. Pushing the lever in this direction will increase feed force.
B. Pulling the lever in this direction will decrease feed force

10
Trigger
When the trigger (A) is pushed in, the feed force stops abruptly and the setting
on the feed control lever is overridden. The piston rod in the pusher leg retracts
automatically. This function is used for example to adjust the height of the rock
drill, when rigging up the pusher leg, or when there is a tendency to jam. When the
trigger is released, the feed control setting is activated again.
Oil regulating valve
Oil dosing is controlled using a screwdriver. Tighten the nut after regulation.
Check that sufficient lubrication is obtained by putting your hand in front of the
exhaust port while adjusting the regulating valve. If the hand is covered by a thin
film of oil after a few seconds, the lubricator has been correctly adjusted. Too much
oil will have negative effects on the operation whilst too little will result in damage
to parts as the temperature rises during operation.
The amount of oil going into the rock drill increases when turning the valve counter
clockwise, and it decreases when turning the valve clockwise. Oil consumption is
2.5–6 ml/minute.