Cobra PRO, TT, TT-AWD Safety And Operating Instructions Manual

Safety and operating instructions

Petrol breakers
Valid for United States of America only

© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12
Original instructions

COBRA

PRO, TT, TT-AWD

Contents

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

About the Safety and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Safety signal words. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Personal precautions and qualifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Personal protective equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Drugs, alcohol or medication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation, precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation, precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maintenance, precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Storage, precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Design and function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Choosing the correct breaker for a task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Main parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Data plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Noise level label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Warning label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Emission compliance label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Two-stroke oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Mixing the petrol and oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Filling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

AWD - Audio Warning Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Insertion tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Selecting the right insertion tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Narrow chisel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Moil point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Wide bladed chisel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Checking for wear on the tool shank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Start and stop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cold start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Restarting a warm machine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Restarting an overheated machine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Stopping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Operating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Starting a cut. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Breaking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Breaking at high altitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Tie tamping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

When taking a break. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Every day. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Wear check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Air filter check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

ContentsCOBRA PRO, TT, TT-AWD

Spark plug check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Hammer mechanism oil check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Every month. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Gearbox oil level check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Every year. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Replacing the starter cord. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Products. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Machine data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Gearbox unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Impact unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Noise and vibration declaration statement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Additional vibration information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Noise and vibration data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

EC Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

EC Declaration of Conformity (EC Directive 2006/42/EC). . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Emission control system warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

General warranty conditions and limitations on liability. . . . . . . . . . . . . . . . . . . . . . . . . . . 27

© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

4

COBRA PRO, TT, TT-AWDContents

Introduction

Thank you for choosing a product from Atlas Copco. Since 1873, we have been
committed to finding new and better ways of fulfilling our customers' needs.
Through the years, we have developed innovative and ergonomic product
designs that have helped customers improve and rationalize their daily work.

Atlas Copco has a strong global sales and service network, consisting of
customer centers and distributors worldwide. Our experts are highly trained
professionals with extensive product knowledge and application experience.
In all corners of the world, we can offer product support and expertise to ensure
that our customers can work at maximum efficiency at all times.

For more information please visit: www.atlascopco.com

Atlas Copco Construction Tools AB

105 23 Stockholm

Sweden

About the Safety and operating
instructions

The aim of the instructions is to provide you with knowledge of how to use the
petrol breaker in an efficient, safe way. The instructions also give you advice
and tell you how to perform regular maintenance on the petrol breaker.

Before using the petrol breaker for the first time you must read these instructions
carefully and understand all of them.

5© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

Safety and operating instructionsCOBRA PRO, TT, TT-AWD

Safety instructions

To reduce the risk of serious injury or death to
yourself or others, read and understand the Safety
and operating instruction before installing, operating,
repairing, maintaining, or changing accessories on
the machine.

Post this Safety and operating instruction at work
locations, provide copies to employees, and make
sure that everyone reads the Safety and operating
instruction before operating or servicing the machine.

In addition, the operator or the operator's employer
must assess the specific risks that may be present
as a result of each use of the machine.

Safety signal words

The safety signal words Danger, Warning and
Caution have the following meanings:

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

DANGER

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

WARNING

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

CAUTION

Personal precautions and
qualifications

Only qualified and trained persons may operate or
maintain the machine. They must be physically able
to handle the bulk, weight, and power of the tool.
Always use your common sense and good
judgement.

Personal protective equipment

Always use approved protective equipment.
Operators and all other persons in the working 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

● Proper protective boots

● Appropriate work overall or similar clothing (not

loose-fitting) that covers your arms and legs.

Drugs, alcohol or medication

WARNING Drugs, alcohol or medication

Drugs, alcohol or medication may impair your
judgment and powers of concentration. Poor
reactions and incorrect assessments can lead to
severe accidents or death.

► Never use the machine when you are tired or

under the influence of drugs, alcohol or
medication.

► No person who is under the influence of drugs,

alcohol or medication may operate the machine.

Installation, precautions

WARNING Ejected insertion tool

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

► Always stop the machine before changing the

inserted tool or accessories.

► Never point the inserted tool at yourself or anyone

else.

► Make sure that the insertion tool is fully inserted

and the tool retainer is in a locked position before
the machine is started.

► Check the lock function by pulling the inserted tool

outwards powerfully.

WARNING Moving or slipping insertion tool

An incorrect dimension of the inserted tool’s shank
can result in that the inserted tool is lost or is slipping
out during operation. Risk of severe injury or crushed
hands and fingers.

► Check that the insertion tool has the shank length

and dimensions that the machine is intended for.

► Never use an insertion tool without a collar.

Operation, precautions

DANGER Explosion hazard

If a warm insertion tool or exhaust pipe comes into
contact with explosives, an explosion could occur.
During operating with certain materials, sparks and
ignition can occur. Explosions will lead to severe
injuries or death.

► Never operate the machine in any explosive

environment.

► Never use the machine near flammable materials,

fumes or dust.

► Make sure that there are no undetected sources

of gas or explosives.

© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

6

COBRA PRO, TT, TT-AWDSafety and operating instructions

► Avoid contact with the warm exhaust pipe or the

bottom of the machine.

DANGER Fuel hazard

The fuel (petrol and oil) is extremely flammable and
petrol fumes can explode when ignited, causing
serious injury or death.

► Protect your skin from contact with the fuel. If fuel

has penetrated the skin, consult a qualified health
professional.

► Never remove the filler cap, and never fill the fuel

tank when the machine is hot.

► Mix the fuel and fill the fuel tank outdoors or in a

clean and well ventilated place, free from sparks
and open flames. Fill the fuel tank at least ten
meters (30 feet) from the place where the machine
is to be used.

► Release the filler cap slowly to let pressure

escape.

► Never overfill the fuel tank.

► Make sure the filler cap is screwed on when the

machine is used.

► Avoid spilling fuel on the machine, wipe off any

spilled fuel.

► Check regularly for fuel leaks. Never use the

machine if it is leaking fuel.

► Never use the machine in the proximity of material

that can generate sparks. Remove all hot or
spark-generating devices before starting the
machine.

► Never smoke when filling the fuel tank or when

working with the machine or servicing it.

► Only store fuel in a container that is specially

constructed and approved for the purpose.

► Consumed petrol and oil containers must be taken

care of and returned to the retailer.

► Never use your fingers to check for fluid leaks.

WARNING Unexpected movements

The inserted tool is exposed to heavy strains when
the machine is used. The inserted tool may break
due to fatigue after a certain amount of use. If the
inserted tool breaks or gets stuck, there may be
sudden and unexpected movement that can cause
injuries. Furthermore, losing your balance or slipping
may cause injury.

► Make sure that you always keep a stable position

with your feet as far apart as your shoulder width,
and keeping a balanced body weight.

► Always inspect the equipment prior to use. Never

use the equipment if you suspect that it is
damaged.

► Make sure that the handles are clean and free of

grease and oil.

► Keep your feet away from the inserted tool.

► Stand firmly and always hold on to the machine

with both hands.

► Never start the machine when it is lying on the

ground.

► Never ‘ride’ on the machine with one leg over the

handle.

► Never strike or abuse the equipment.

► Check regularly for wear on the insertion tool, and

check whether there are any signs of damage or
visible cracks.

► Pay attention and look at what you are doing.

7© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

Safety and operating instructionsCOBRA PRO, TT, TT-AWD

WARNING Dust and fume hazard

Dusts and/or fumes generated or dispersed when
using the machine may cause serious and permanent
respiratory disease, illness, or other bodily injury (for
example, silicosis or other irreversible lung disease
that can be fatal, cancer, birth defects, and/or skin
inflammation).

Some dusts and fumes created by drilling, breaking,
hammering, sawing, grinding and other construction
activities contain substances known to the State of
California and other authorities to cause respiratory
disease, cancer, birth defects, or other reproductive
harm. Some examples of such substances are:

● Crystalline silica, cement, and other masonry

products.

● Arsenic and chromium from chemically-treated

rubber.

● Lead from lead-based paints.

Dust and fumes in the air can be invisible to the
naked eye, so do not rely on eye sight to determine
if there is dust or fumes in the air.

To reduce the risk of exposure to dust and fumes,
do all of the following:

► Perform site-specific risk assessment. The risk

assessment should include dust and fumes
created by the use of the machine and the
potential for disturbing existing dust.

► Use proper engineering controls to minimize the

amount of dust and fumes in the air and to
minimize build-up on equipment, surfaces,
clothing, and body parts. Examples of controls
include: exhaust ventilation and dust collection
systems, water sprays, and wet drilling. Control
dusts and fumes at the source where possible.
Make sure that controls are properly installed,
maintained and correctly used.

► Wear, maintain and correctly use respiratory

protection as instructed by your employer and as
required by occupational health and safety
regulations. The respiratory protection must be
effective for the type of substance at issue (and if
applicable, approved by relevant governmental
authority).

► Work in a well ventilated area.

► If the machine has an exhaust, direct the exhaust

so as to reduce disturbance of dust in a dust filled
environment.

► Operate and maintain the machine as

recommended in the operating and safety
instructions

► Select, maintain and replace consumables/

inserted tools/ other accessory as recommended
in the operating and safety instructions. Incorrect
selection or lack of maintenance of consumables/
inserted tools/ other accessories may cause an
unnecessary increase in dust or fumes.

► Wear washable or disposable protective clothes

at the worksite, and shower and change into clean
clothes before leaving the worksite to reduce
exposure of dust and fumes to yourself, other
persons, cars, homes, and other areas.

► Avoid eating, drinking, and using tobacco products

in areas where there is dust or fumes.

► Wash your hands and face thoroughly as soon as

possible upon leaving the exposure area, and
always before eating, drinking, using tobacco
products, or making contact with other persons.

► Comply with all applicable laws and regulations,

including occupational health and safety
regulations.

► Participate in air monitoring, medical examination

programs, and health and safety training programs
provided by your employer or trade organizations
and in accordance with occupational health and
safety regulations and recommendations. Consult
with physicians experienced with relevant
occupational medicine.

► Work with your employer and trade organization

to reduce dust and fume exposure at the worksite
and to reduce the risks. Effective health and safety
programs, policies and procedures for protecting
workers and others against harmful exposure to
dust and fumes should be established and
implemented based on advice from health and
safety experts. Consult with experts.

DANGER Exhaust gas hazard

The exhaust gas from the machine’s combustion
engine contains carbon monoxide which is
poisonous, and chemicals known to the State of
California and other authorities to cause cancer, birth
defects, or other reproductive harm. Inhalation of
exhaust fumes can cause serious injury, illness, or
death.

► Never inhale exhaust fumes.

► Never operate the machine indoors or in a poorly

ventilated area.

► Never stand in a deep hole, ditch, or simular

surrounding during operating.

© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

8

COBRA PRO, TT, TT-AWDSafety and operating instructions

WARNING Projectiles

Failure of the work piece, of accessories, or even of
the machine itself may generate high velocity
projectiles. During operating, splinters or other
particles from the working material may become
projectiles and cause personal injury by striking the
operator or other persons. To reduce these risk:

► Use approved personal protective equipment and

safety helmet, including impact resistant eye
protection with side protection.

► Make sure that no unauthorised persons trespass

into the working zone.

► Keep the workplace free from foreign objects.

► Ensure that the work piece is securely fixed.

WARNING Splinters hazard

Using the insertion tool as a hand struck tool can
result in splinters hitting the operator and can cause
personal injury.

► Never use a insertion tool as a hand struck tool.

They are specifically designed and heat-treated
to be used only in a machine.

WARNING Slipping, tripping and falling

hazards

There is a risk of slipping or tripping or falling, for
example tripping on the hoses or on other objects.
Slipping or tripping or falling can cause injury. To
reduce this risk:

► Always make sure that no hose or other object is

in your way or in any other person's way.

► Always make sure you are in a stable position with

your feet as far apart as your shoulders width and
keeping a balanced body weight.

WARNING Motion hazards

When using the machine to perform work-related
activities, you may experience discomfort in the
hands, arms, shoulders, neck, or other parts of the
body.

► Adopt a comfortable posture whilst maintaining

secure footing and avoiding awkward off-balanced
postures.

► Changing posture during extended tasks may help

avoid discomfort and fatigue.

► In case of persistent or recurring symptoms,

consult a qualified health professional.

WARNING Vibration hazards

Normal and proper use of the machine exposes the
operator to vibration. Regular and frequent exposure
to vibration may cause, contribute to, or aggravate
injury or disorders to the operator’s fingers, hands,
wrists, arms, shoulders and/or nerves and blood
supply or other body parts, including debilitating
and/or permanent injuries or disorders that may
develop gradually over periods of weeks, months, or
years. Such injuries or disorders may include damage
to the blood circulatory system, damage to the
nervous system, damage to joints, and possibly
damage to other body structures.

If numbness, persistent recurring discomfort, burning
sensation, stiffness, throbbing, tingling, pain,
clumsiness, weakened grip, whitening of the skin, or
other symptoms occur at any time, when operating
the machine or when not operating the machine, stop
operating the machine, tell your employer and seek
medical attention. Continued use of the machine after
the occurrence of any such symptom may increase
the risk of symptoms becoming more severe and/or
permanent.

Operate and maintain the machine as recommended
in these instructions, to prevent an unnecessary
increase in vibration.

The following may help to reduce exposure to
vibration for the operator:

► Let the tool do the job. Use a minimum hand grip

consistent with proper control and safe operation.

► If the machine has vibration absorbing handles,

keep them in a central position, avoid pressing the
handles into the end stops.

► When the percussion mechanism is activated, the

only body contact with the machine you should
have are your hands on the handle or handles.
Avoid any other contact, for example supporting
any part of the body against the machine or
leaning onto the machine trying to increase the
feed force. It is also important not to keep the start
and stop device engaged while extracting the tool
from the broken work surface.

► Make sure that the inserted tool is well-maintained

(including sharpness, if a cutting tool), not worn
out, and of the proper size. Insertion tools that are
not well-maintained, or that are worn out, or that
are not of the proper size result in longer time to
complete a task (and a longer period of exposure
to vibration) and may result in or contribute to
higher levels of vibration exposure.

► Immediately stop working if the machine suddenly

starts to vibrate strongly. Before resuming the
work, find and remove the cause of the increased
vibrations.

► Never grab, hold or touch the inserted tool when

using the machine.

9© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

Safety and operating instructionsCOBRA PRO, TT, TT-AWD

► Participate in health surveillance or monitoring,

medical exams and training programs offered by
your employer and when required by law.

► When working in cold conditions wear warm

clothing and keep hands warm and dry.

See the ”Noise and vibration declaration statement”
for the machine, including the declared vibration
values. This information can be found at the end of
these Safety and operating instructions.

DANGER Electrical hazard

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

► Never operate the machine near any electric wire

or other source of electricity.

► Make sure that there are no concealed wires or

other sources of electricity in the working area.

WARNING Concealed object hazard

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

► Check the composition of the material before

operating.

► Watch out for concealed cables and pipes for

example electricity, telephone, water, gas and
sewage lines etc.

► If the inserted tool seems to have hit a concealed

object, switch off the machine immediately.

► Make sure that there is no danger before

continuing.

WARNING Involuntary start

Involuntary start of the machine may cause injury.

► Keep your hands away from the start and stop

device until you are ready to start the machine.

► Learn how the machine is switched off in the event

of an emergency.

WARNING Noise hazard

High noise levels can cause permanent and disabling
hearing loss and other problems such as tinnitus
(ringing, buzzing, whistling, or humming in the ears).
To reduce risks and prevent an unnecessary increase
in noise levels:

► Risk assessment of these hazards and

implementation of appropriate controls is essential.

► Operate and maintain the machine as

recommended in these instructions.

► Select, maintain and replace the insertion tool as

recommended in these instructions.

► If the machine has a silencer, check that it is in

place and in good working condition.

► Always use hearing protection.

► Use damping material to prevent work pieces from

'ringing'.

WARNING Unstable position hazard

During operation of the machine, there is a risk for
falling, tripping and/or coming in contact with the
inserted tool, which can cause injury. This risk
increases if you work in an unstable position or on
any unstable ground, object or surface. To reduce
this risk:

► Never work in an unstable position.

► Always make sure you are in a stable position with

your feet as far apart as your shoulder width and
keeping a balanced body weight.

► Never stand on any unstable ground, objects or

surfaces.

WARNING Slippery machine surface hazard

There is a risk that the machine (for example, the
handle and other surfaces) is slippery due to grease,
oil, or other substances. If the machine is slippery,
there is a risk that you might lose your grip, drop the
machine, and/or come in contact with the inserted
tool during operation of the machine. Any such event
can cause injury. To reduce this risk:

► Always make sure that the handles and other

gripping surfaces of the machine are not slippery.

► Always make sure that the handles and other

gripping surfaces are free from grease and oil.

Maintenance, precautions

WARNING Machine modification

Any machine modification may result in bodily injuries
to yourself or others.

► Never modify the machine. Modified machines are

not covered by warranty or product liability.

► Always use original parts, insertion tools and

accessories approved by Atlas Copco.

► Change damaged parts immediately.

► Replace worn components in good time.

CAUTION High temperature

The machine's front cover, exhaust pipe, and bottom
become hot during operation. Touching it can lead
to burns.

► Never touch a hot front cover.

► Never touch the hot exhaust pipe.

► Never touch the bottom of the machine when its

hot.

© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12

Original instructions

10

COBRA PRO, TT, TT-AWDSafety and operating instructions