Cobra Combi, Standard Safety And Operating Instructions Manual

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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

Cobra Combi & Standard

Safety and operating instructions

Cobra Combi & Standard

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

Cobra Combi & Standard

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

Cobra Combi & Standard

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.

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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.

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Cobra Combi & Standard

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.

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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.

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Cobra Combi & Standard

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 wellventilated 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.

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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.

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Cobra Combi & Standard

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.

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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.

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Cobra Combi & Standard

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.

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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.

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Cobra Combi & Standard

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.

Cobra Combi & Standard

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).

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

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Cobra Combi & Standard

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.

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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.

Cobra Combi & Standard

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.

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.

Cobra Combi & Standard

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.).

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.

Cobra Combi & Standard

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.

Cobra Combi & Standard

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

) 5.0 5.0

Spread in method and production (ka m/s

) 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.

Cobra Combi, Standard Safety And Operating Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual