PDF User Manual

  1. Home
  2. Manuals
  3. Cobra Combi Safety And Operating Instructions Manual

Cobra Combi Safety And Operating Instructions Manual

Standard

Made by: Cobra
Type: Safety And Operating Instructions
Category: Drill
Pages: 16
Size: 0.93 MB

 

Download PDF User Manual



Full Text Searchable PDF User Manual



background image

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

COMBI & STANDARD

COBRA 

Safety and operating instructions

Petrol drills and breakers

 

Prescriptions de securité et Instructions 
pour l’opérateur

Marteaux-perforateurs

Sicherheitsvorschriften und 
Bedienungsanleitung

Bohrer und Meißel mit Benzinmotor

Instrucciones de seguridad y para el 
operario

Perforadores y rompedores de gasolina

Instrucoes de seguranca o instrucoes de 
operacao

Máquinas de perfuração petrolífera e de 
demolição

Manuale di istruzioni sulla sicurezza per 
l’uso dei

Perforatori/demolitori a motore

Veiligheidsinstrukties en 
beidieningsinstrukties

Benzinegedreven boor- en sloophamer

Οδηγίες ασφάλειας και λειτουργίας

Βενζινοκίνητες σφύρες και κρουστικά 
μηχανήματα

Turvallisuusohjeet ja käyttöohje

Polttonesteporat ja –murskaimet

Sikkerhedsinstruktioner og 
betjeningsvejledning

Benzindrevne bor og mejselhamre

Sikkerhetsinstrukser og bruksanvisning

Motorboremaskiner og spett

Säkerhetsinstruktion och instruktionsbok

Bensindrivna borrar och spett

COBRA 

COMBI

COBRA 

STANDARD

 

 


background image

2

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

 


background image

3

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Contents

CONTENTS

English

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Français

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Deutsch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Español

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Português

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Italiano

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Nederlands

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Ελληνικά

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Suomi

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Dansk

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Norsk

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Svenska

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

 


background image

4

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Contents

CONTENTS ENGLISH

SAFETY INSTRUCTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Safety symbols used

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5

Machine and tool operating hazards

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5

Fume and exhaust hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

Explosion and fire hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

Explosion and fire hazard, continued

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

Electrical/Concealed object hazards

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

Projectile hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7

Noise hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

Silica/Dust hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

Vibration hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

Machine modification hazard

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8

Additional safety instructions

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

Protective equipment

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

Service and maintenance 

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

Machine tools

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

OPERATING INSTRUCTIONS

  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Design and function

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

Main parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

Preparations before starting

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

Tool shank  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Fuel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Two-stroke oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Starting and stopping

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11

Cold start  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Restarting a warm machine  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Number of revs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Ground probing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Stopping the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Drilling (Cobra Combi)

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

Flushing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Inserting the tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Function selector: Drilling and breaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Drilling deep holes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Regular care

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

Air filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Decals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Maintenance

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14

Spark plug  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Changing the starting cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Fitting a new cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Tool chuck  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Carburettor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Trouble shooting

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15

Scrapping worn-out machines

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15

Technical data

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16

Cobra Combi  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Cobra Standard  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Noice and Vibration Declaration Statement

 . . . . . . . . . . . . . . . . . . . . . . . . . .  16

ENGLISH

 


background image

5

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

SAFETY INSTRUCTIONS

To reduce risk of serious injury or death to yourself 
or others, read these safety instructions before 
operating the machine. 

Post these safety instructions at work locations, 
provide copies to employees, and make sure that 
everyone reads the safety instructions before 
operating or servicing the machine. 

Comply with all safety regulations.

Safety symbols used

The indications 

Danger

Warning

 and 

Caution

 

have the following meanings:

  Danger

Indicates an imminently 
hazardous situation which, 
if not avoided, will result in 
death or serious injury.

  Warning

Indicates a potentially 
hazardous situation which, 
if not avoided, could result 
in death or serious injury.

  Caution

Indicates a potentially 
hazardous situation which, 
if not avoided, may result 
in minor or moderate 
injury.

Machine and tool operating 
hazards

 Warning

Sudden or unexpected movement of the machine 
may occur during operating, which may cause 
injuries. In addition loosing your balance or slipping 
may cause injury. To reduce such risks: 

Make sure that you always keep a stable 
position with your feet as wide apart as your 
shoulder width, and keep a balanced body 
weight.

Stand firmly and always hold on to the machine 
with both hands. 

Do not start the machine when it is laying on the 
ground.

Make sure that the handles are clean and free of 
grease and oil. 

 Warning

Unintended start of the machine may cause injury. 

Keep your hands away from the start and stop 
device until you are about to start work. 

 Warning

The insertion tool is exposed to heavy strains 
when the machine is used and after a certain 
amount of use the tool may break due to fatugue. 
If the tool breaks, there may be sudden or strong 
movements. Such sudden or strong movements 
may cause serious injury.

Make sure that you always keep a stable 
position with your feet as wide apart as your 
shoulder width, and keep a balanced body 
weight.

Keep your feet away from the insertion tool.

Do not ’ride’ on the machine with one leg over 
the handle, since you could be seriously injured 
if the tool suddenly were to break.

Check regulary for any wear on the insertion 
tool, and if there are any risks of damages or 
fractures.  

Do not use worn out or damaged insertion tools. 

 Warning

Incorrrect dimension of the insertion tool's shank 
can result in that the insertion tool may be dropped 
or ejected. A dropped or ejected insertion tool can 
cause personal injury. 

Before the insertion tool is mounted, make sure 
that the shank is correct for the machine. 

An insertion tool without a collar should not be 
used.

 Warning

If the insertion tool retainer on the machine is not in 
a locked position, the tool can be ejected with great 
force, which can cause serious injury. 

After the insertion tool is mounted and locked, 
the lock function must be checked by pulling the 
insertion tool powerful.

Make sure that the tool is fully inserted and the 
tool retainer is in a locked position before the 
machine is started.

 Warning

Changing the inserted tool while the machine is 
running may cause serious injury.

Before changing the insertion tool, always stop 
the machine and close down the machine by 
pushing the start and stop device. 

 


background image

6

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

 Warning

The exhaust pipe and the bottom of the machine 
can become very hot during operation, and 
can remain hot during a period of time after the 
machine has been shut off. 

To reduce the risk of burns or related injuries, 
avoid contact with the exhaust pipe or the 
bottom of the machine.

 Warning

If the drill steel gets caught during operation, the 
whole machine will start to rotate if you lose your 
grip. Such an unexpected rotation of the entire 
machine may cause serious injury. 

Stand firmly and always hold the machine with 
both hands. 

Make sure that the handles are clean and free 
of grease and oil. 

Never drill in an old hole.

 Warning

There is a risk of objects getting dragged into or 
getting caught by a rotating drill steel. This may 
cause serious injury. 

Never grab or touch a rotating drill steel. 

Avoid wide cloths that may get caught. 
If you have long hair, cover with a hair net.

Fume and exhaust hazard

 Danger

The exhaust fumes from the machine’s combustion 
engine contain carbon monoxide which is 
poisonous. Inhalation of exhaust fumes can cause 
serious injury or death.  

Do not inhale exhaust fumes. 

Never operate the machine indoors or in poorly 
ventilated areas.

Explosion and fire hazard

 Danger

If the machine comes in contact with explosives, 
an explosion may occur. Explosions may cause 
serious injury or death. 

To reduce risk of explosion: 

Never drill or operate the equipment near 
any explosives, including dynamite or other 
explosives in the rock.

Make sure that there are no explosives in the 
rock. 

Never break or drill in an old hole.

 Warning

Breaking, drilling and working with certain 
materials can cause sparks, which may ignite 
explosive gases which can cause explosions. 
Explosions may cause serious injury or death. 

To reduce risk of explosion:

Never operate the equipment in any explosive 
environments.

Do not use the machine near flammable 
materials, fumes or dust.

Make sure that there are no undetected sources 
of gas.

 Warning

During operation of the machine, the exhaust pipe 
gets very hot and may stay hot for a period of time 
even after you have shut off the engine. Materials 
that come in contact with a hot exhaust pipe may 
ignite and cause fire or explosion, which can cause 
serious injury. To reduce risk of fire or explosion:

Do not use the machine near flammable 
materials, fumes or dust.  During breaks in 
work, remember not to place the machine near 
flammable materials.

Do not operate the machine in explosive 
environments.

Keep the workplace clean and free from foreign 
objects.

 


background image

7

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Explosion and fire hazard, 
continued

 Warning

Fuel is highly flammable, and its vapors can 
explode if ignited, which can cause serious injury 
or death. To reduce risk of fire or explosion:

Store fuel only in containers that are specifically 
designed and approved for storage of fuel. 
Empty fuel containers must be properly taken 
care of and sent back to the retailer.

Operate the machine with the fuel cap securely 
in place. Never remove the fuel cap or add fuel 
when the engine is hot. Stop the engine and 
allow it to cool before adding fuel. When opening 
the fuel cap, always loosen the cap slowly to 
relieve any pressure in the tank. Do not overfill 
the tank.

Always mix and add fuel in a clean and well-
ventilated area. Make sure that this outdoor area 
is free from any flames or sparks. Never smoke 
while fuelling, mixing fuel, operating or servicing 
the machine. Avoid spilling fuel. Wipe up any 
fuel that is spilled on the machine. Fill the tank 
at least ten meters (30 feet) away from where 
you intend to use the machine. 

Do not use a machine that is leaking fuel.
Regularly check for any leakage.

To minimize the risk of fuel leakage during 
transportation, secure that the machine is in an 
upright position during transportation.

Do not use the machine near flammable 
materials, fumes or dust. During breaks in 
work, do not place the machine near flammable 
materials.

Do not operate the machine near any materials 
that create sparks. Remove all hot objects 
and objects that create sparks prior to using 
machine.

Do not operate the machine in an explosive 
environment.

Protect your skin from contact with fuel.

Electrical/Concealed object 
hazards

 Warning

The machine is not electrically insulated. If the 
machine comes in contact with electricity, serious 
injuries or death may result.  

To reduce the risk of injury or death, never drill 
or break near any electric wire or other source of 
electricity.  

Make sure that there are no concealed wires or 
other sources of electricity.  

 Warning

During drilling and breaking, concealed wires and 
pipes constitute a danger that can result in serious 
injury. 

Before you start drilling or breaking, check the 
composition of the material you are to work on.

 Watch out for concealed electrical wiring, water, 
sewage and gas pipes and phone lines. 

If the tool seems to have hit a concealed object, 
immediately switch off the machine. 

Make sure that there is no danger before 
continuing. 

Projectile hazard

 Warning

During breaking, drilling or hammering, splinters or 
other particles of rock may become projectiles and 
cause bodily injury by striking the operator or other 
persons.

Use approved personal protective equipment, 
including impact resistant safety glasses with 
side protection, to reduce the risk of being 
injured by a projectile.

 


background image

8

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Noise hazard

 Warning

High sound levels may cause permanent hearing 
loss.

Use hearing protection in accordance with 
occupational health and safety regulations.

Silica/Dust hazard

 Warning

Exposure to crystalline silica (sometimes called 
“silica dust”) as a result of breaking, drilling, or 
hammering of rock, concrete, asphalt or other 
materials may cause silicosis (a serious lung 
disease), silicosis-related illnesses, cancer, or 
death. Silica is a major component of rock, sand 
and mineral ores.  

To reduce silica exposure:

Use proper engineering controls to reduce the 
amount of silica in the air and the build-up of 
dust on equipment and surfaces.  Examples of 
such  controls include: exhaust ventilation and 
dust collection systems, water sprays, and wet 
drilling. Make sure that controls are properly 
installed and  maintained.

Wear, maintain, and correctly use approved 
particulate respirators when engineering controls 
alone are not adequate to reduce exposure 
below permissible levels. 

Participate in air monitoring, medical exams, 
and training programs offered by your employer 
and when required by law. 

Wear washable or disposable protective clothes 
at the worksite; shower and change into clean 
clothes before leaving the worksite to reduce    
exposure of silica to yourself, other persons, 
cars, homes, and other areas. 

Do not eat, drink, or use tobacco products in 
areas where there is dust containing crystalline 
silica. 

Wash your hands and face before eating, 
drinking, or using tobacco products outside of 
the exposure area. 

Work with your employer to reduce silica 
exposure at your worksite.

 Warning

Some dust or other airborne material created 
during use of the machine may contain 
chemicals known to the State of California 
to cause cancer and birth defects or other 
reproductive harm. Some examples of such 
chemicals are:

Crystalline silica and cement and other masonry 
products.

Arsenic and chromium from chemically-treated 
rubber.

Lead from lead based paints.

To reduce your exposure to these chemicals, 
work in a well ventilated area, and work with 
approved safety equipment, such as dust masks 
that are specially designed to filter out microscopic 
particles.

Vibration hazard

 Warning

Repetitive tasks, awkward working positions or 
vibrations may cause injury to your fingers, hands, 
arms, and other body parts. Exposure to vibrations 
may restrict blood supply to the hands and fingers, 
which may cause injury. If numbness, tingling, 
pain, whitening of the skin, or reduction in feeling 
occurs when you use the machine, or even when 
you are not using the machine, do not use the 
machine and contact a physician.

The inserted tool creates vibrations that may cause 
injury. Do not grab, hold, or touch the tool when 
using the machine.

Machine modification hazard

 Warning

Any machine modification not approved by Atlas 
Copco may result in serious injuries to yourself or 
others.

The machine must not be modified without Atlas 
Copco's permission. 

Use only original parts and accessories 
approved by Atlas Copco.

 


background image

9

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Additional safety instructions

Machines and accessories must only be used 
for their intended purpose.

Only qualified and trained persons may operate 
or maintain the machine.

Keep your hand away from the start and stop 
device until work is to begin.

Learn how the machine is switched off in the 
event of an emergency.

The machine should be operated at reduced 
power when drilling is started. 

Release the start and stop device in case of 
interruption of the energy supply.

Always inspect the equipment prior to use. 
Do not use equipment if you suspect that it 
could be damaged.

Check the insertion tools for wear or damages 
at regular intervals. Do not use worn out or 
damaged insertion tools.

Always use your common sense and good 
judgment.  

Do not use the machine when you are tired or 
under the influence of drugs, alcohol or anything 
else that may affect your vision, reactions or 
judgement.  

Participate in safety and training courses. 

Never strike or abuse any equipment.

Keep the machine and tools in a safe and locked 
place out of reach of children.

Make sure that the all attached and related 
equipment is properly maintained.  

Signs and stickers that are important for your 
safety and the care of the machine are included 
with every machine. New signs and stickers can 
be ordered using the spare parts list.

Protective equipment

Always use approved personal protective 
equipment. Operators and other persons in the 
work area must wear protective equipment, 
including at a minimum:

Protective helmet

Hearing protection

Impact resistant eye protection with side 
protection

Respiratory protection when appropriate

Protective gloves 

Protective boots

Service and maintenance 

Regular maintenance is a prerequisite for keeping 
the machine a safe tool. Carefully follow the 
operating instructions.  

Use only authorized parts. Any damage or 
malfunction caused by the use of unauthorized 
parts is not covered by Warranty or Product 
Liability.

Change damaged parts immediately. 

Replace damaged and worn out components in 
good time. 

For major service to the machine, contact your 
nearest authorized Atlas Copco workshop. 

When cleaning mechanical parts with solvent, 
make sure that current health and safety 
regulations are complied and that the ventilation 
is satisfactory.

Machine tools

Keep the tools clean and in a good condition. 
Check tools regulary and make sure that they 
are sharp.

 


background image

10

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

OPERATING 
INSTRUCTIONS

Design and function

Cobra Combi is a combined drilling and 
hammering machine. It is equipped to be used 
for breaking asphalt and concrete and for drilling 
in concrete and granite. 

Cobra Standard is not a combined machine and 
is designed for breaking only. 

Main parts

A Choke

B Throttle 

lever 

C Vibration-dampened handle

D Engine piston

E Silencer

F  Intake valve for flushing air

G  Compression chamber for flushing air

H Rotation mechanism

I Tool 

retainer

J  Air filter cover

K Tank 

cap

L Starting 

handle

M Power take-off (PTO)

N Spark plug cover

O Percussion piston

P Gas 

duct

Q  Gas duct valve

R  Function selector (Cobra Combi)

S Venturi

T Stop-button

U Fuel filter 

Preparations before starting

Tool shank 

Use a shank gauge to check that the tool shank is of the 
correct size, i.e. H 22x108 mm (7/8” x 4 1/4”). The shank 
must be clean and the tool must be in good condition.

Fuel

Cobra Combi and Standard use a mixture of petrol and 
two-stroke oil, 1 part oil to 50 parts petrol (2%).

Two-stroke oil

For the best lubricating results use Atlas Copco’s 
environmentally friendly two-stroke oil, which 
has been specially developed for Atlas Copco’s 
petrol motor-driven hammering and rock-drilling 
machines. If Atlas Copco’s two-stroke oil is not 
available, use a high-quality two-stroke oil for 
air-cooled two-stroke motors (not two-stroke oil 
for outboard motors). Contact your nearest Atlas 
Copco representative for advice on the correct 
two-stroke oil.

 


background image

11

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Starting and stopping

A Vibration-dampened 

handle

B Throttle 

lever 

C Stop button

D Choke

E Fuel 

filling

F Starting 

handle

Cold start 

Close the choke – turn the choke control 
anticlockwise to position (CHOKE) 

Push the throttle lever down and pull the 
starter handle.

When the machine ignites, open the choke 
one step clockwise towards position (RUN).

1.

2.

3.

Pull the starting handle. When the machine 
starts, slowly turn the choke clockwise 
towards position (RUN) during a 2–3 minutes 
warm-up period.

Restarting a warm machine

Check that the choke is open (i.e. knob in 
position RUN). 

Pull the starter handle.

If the machine stops after a short while, or does 
not start at all, follow the procedure for cold 
starting.

If the machine does not start, it may have been 
flooded (i.e. too much fuel in the combustion 
chamber).

Open the choke (RUN position) and try starting 
the engine again.

If the machine still does not start, see the 
section entitled "Trouble shooting".

Number of revs

The engine speed is regulated by means of the 
throttle lever:

Lever released    – idling speed

4.

1.

2.

 


background image

12

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Lever depressed – full engine speed

Ground probing

If the machine is started on top of long tools such 
as probing rods, a starter-cord bracket must be 
used to prevent the cord from damaging the fuel 
tank.

Stopping the engine

Stop the engine by depressing the stop button. 

Drain the fuel tank before transporting the 
machine, drain also the fuel tank when the 
machine is not to be used for a long period of 
time.

Drilling (Cobra Combi)

Flushing

Before drilling, check that the flushing hole in the drill 
steel is not blocked.

Inserting the tool

Stop the machine. Insert the tool into the chuck and use 
your foot to lock the tool retainer.

Function selector: Drilling and breaking

Drilling: 

Turn the function 
selector downwards. 
This will engage 
rotation and flushing 
air.

Breaking: 

To adjust the direction 
of the tool blade, 
first put the function 
selector in the neutral 
position.

Locked position:

Lock the tool blade in 
the desired position 
by turning the selector 
upwards. The rotation 
mechanism is now 
locked.

 


background image

13

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Collaring

With the engine idling, press the machine and tool 
against the spot where you wish to drill. Increase 
the engine speed once the drill bit has collared a 
footing in the rock (or other material).

Grip the side handle for better control of the 
machine.

Drilling deep holes

First use a short drill and then fullly drill into 
the hole. 

Then change to a longer drill with a slightly 
smaller bit diameter (approx. 1 mm smaller).

Regular care

Air filter

In the event of continuous use, check and change 
the filter at least every shift.

Unscrew the filter cover.

1.

2.

1.

Carefully strike the filter against the palm of
your hand. Extremely dirty filters must be
replaced. The filter must never be washed.

Gas duct

The gas duct must be checked regularly for carbon 
deposits, and cleaned if necessary.

1. Pull the starting handle until the arrow in the 

centre of the flywheel (which can be seen 
through the fan cover) points upwards. This 
indicates that the engine piston is in the upper 
position. 

2. Unscrew the gas duct valve 

and take out the cleaning 
rod. Clean the duct and 
cleaning rod using the 
cleaning needle provided.

3. Clean the cleaning thread

4. Clean the channel using the cleaning needle 

provided.

5. Check that the ball in the gas duct valve is not 

stuck.

2.

 


background image

14

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Decals

Replace damaged or worn decals. Order numbers 
can be found in the spare-parts list.

Maintenance

Spark plug

Lift the spark plug cover by the lower lip, and 
turn it up to one side.

Use a plug spanner to remove the spark 

plug.

If the spark plug is dirty or burned, it must be 
replaced. Use original Bosch WR7AC spark 
plugs.

If the pin has been dampened by fuel, dry 
it off, check the ignition spark, and pull the 
starter handle 2–3 times to ventilate off any 
excess fuel.

Fit the spark plug back into the cylinder.

Note!

 The electrode gap should be 1.5 mm 

(0.060 in.).

1.

2.

3.

4.

5.

Changing the starting cord

Remove the screw-cap of the PTO (See 
image under "Main parts"). Remove the three 
bolts from the protective cover of the starting 
mechanism. 

Lift off the cover, grasping the starter pulley 
as well. Let the cover rotate carefully against 
the starter pulley, to release the spring 
tension. 

Remove the old starting cord.

Fitting a new cord

Oil the needle bearing in the starter pulley. 

Fit together the starter pulley and protective 
cover, so that the starting spring locates in 

the starter pulley. 

Wind the full length of the cord onto the 
pulley.

Pre-tension the starting spring by about one 
turn (clockwise) before fitting the assembly 
into place. 

Pull the starting handle carefully, in order to 

locate the cover correctly. 

Fit and tighten the hexagonal bolts and the 
PTO screw-cap. 

1.

2.

3.

1.

2.

3.

4.

5.

6.

 


background image

15

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Tool chuck

If the chuck gauge provided can be inserted 
fully across the flats of the hexagonal chuck, this 
indicates that the chuck is worn out and must be 
replaced.

Carburettor

 

On delivery the carburettor is adjusted and locked 
so it meets EPA’s exhaust-gas standard.

The carburettor nozzle does not normally need to 
be adjusted. 

Normal setting:

Main nozzle (Cobra Combi Fe-cyl) (1) ........... 1,8 turns open

Idling nozzle (Cobra Combi Fe-cyl) (2) ........... 2,1 turns open

Main nozzle (1) ............................................... 2,0 turns open

Idling nozzle (2) .............................................. 2,0 turns open

When loaded, the maximum revs should be 
2500–2650 rpm. The idling revs should be 
1600–1800 rpm. 

Trouble shooting

If the engine does not start, is difficult to start, runs 
unevenly or has poor output, check the points 
mentioned below (See image under "Main parts").

Check that the Stop button (See C under 
"Starting and stopping") is in the ON position.

Check the fuel level.

Check the spark plug’s electrode distance.

Check that the air filter is not blocked.

Check that the fuel filter (See U under "Main 
parts") is not blocked.

If the machine still does not work satisfactorily 
following this procedure, please contact your 
nearest authorised Atlas Copco workshop.

Scrapping worn-out 
machines

Worn-out machines must be dealt with and 
deposited in such a way that the maximum amount 
of material can be recycled and the environment is 
affected as little as possible.

Note:

 Before a motor-driven drill is deposited 

or thrown-away it must be emptied and 
cleaned of petrol. Remaining petrol must 
be dealt with in a way which not affects the 
environment.

1.

2.

3.

4.

5.

 


background image

16

Cobra Combi & Standard

© 2005 Atlas Copco Construction Tools AB 

|

 No 9800 0636 90 

|

 2005-09-16

Safety and operating instructions

Technical data

Cobra Combi

Cobra Standard

Engine

Type

1 cylinder, two-stroke, air 
cooled

1 cylinder, two-stroke, air 
cooled

Cylinder displacement

185 cc

185 cc

Speed, crankshaft 
(strokes/min)

Full speed 2500–2650 r/min
Idling 1600–1800 r/min

Full speed 2500–2650 r/min
Idling 1600–1800 r/min

Carburettor

Membran type (Walbro)

Membran type (Walbro)

Ignition system

Thyristor type, breakerless

Thyristor type, breakerless

Spark plug (recommended)

Bosch WR7AC

Bosch WR7AC

Spark plug gap

1.5 mm (0.060 in.)

1.5 mm (0.060 in.)

Starter

Magnapull

Magnapull

Fuel type

Petrol 90–100 octane, 
lead-free only

Petrol 90–100 octane, 
lead-free only

Oil type

Atlas Copco two-stroke oil or 
recommended two-stroke oil

Atlas Copco two-stroke oil or 
recommended two-stroke oil

Fuel mixture

2% (1:50)

2% (1:50)

Fuel consumption

Approx. 1.1–1.4 litres/hour
(0.29–0.37 US gallons/hour)

Approx. 1.1–1.4 litres/hour
(0.29–0.37 US gallons/hour)

Capacities 

Max drilling depth

2 m

-

Penetration rate with 29 mm drill bit

250–350 mm/min

-

Penetration rate with 34 mm drill bit

200–300 mm/min

-

Penetration rate with 40 mm drill bit

150–200 mm/min

-

Other data

Tool shank

H 22x108 mm

H 22x108 mm

Machine weight

(Fe-cyl) 29.2 kg
(Al-cyl) 25.6 kg

23.4 kg

Service weiht (machine incl. fuel and tools)

(Fe-cyl) 31.4 kg
(Al-cyl) 27.8 kg

25.6 kg

Length

732 mm

694 mm

Width, max

470 mm

470 mm

Noice and Vibration Declaration Statement

Sound effect according to EN ISO 3744 in accordance with directive 2000/14/EG

Lp measured, r = 1m dB (A) rel 20 µPa

100

99

Lw guaranteed dB (A) rel 20 µPa

108

107

Vibration according to EN28662-5

Measured vibration value (a m/s

2

)

5.0

5.0

Spread in method and production (ka m/s

2

)

3.5

3.5

These declared values were obtained by laboratory type testing in compliance with the stated standards and are not 
adequate for use in risk assessments. Values measured in individual work places may be higher than the declared 
values. The actual exposure values and risk of harm experienced by an individual user are unique and depend upon 
the way the user works, the workpiece and work station design, as well as upon the exposure time and the  physical 
condition of the user. We, Atlas Copco Construction Tools AB, cannot be held liable for the consequences of using 
the declared values, instead of values reflecting the actual exposure, in an individual risk assessment in a work place 
situation over which we have no control.