Epiroc Hydraulic Breakers

1 Introduction

Epiroc is a leading productivity partner for the mining, infrastructure and natural resources industries. With cutting-edge technology, Epiroc develops and produces innovative drill rigs, rock excavation and construction equipment, and provides world-class service and consumables.

The company was founded in Stockholm, Sweden, and has passionate people supporting and collaborating with customers in more than 150 countries.

Construction Tools PC AB
Box 703
391 27 Kalmar
Sweden

1.1 About the Safety and Operating Instructions

The aim of these instructions is to provide knowledge on how to use the hydraulic breaker efficiently and safely. The instructions also offer advice and guidance on performing regular maintenance.

Before using the hydraulic breaker for the first time, read and understand all instructions carefully.

2 Safety Instructions

To reduce the risk of serious injury or death, read and understand these Safety and Operating Instructions before installing, operating, repairing, maintaining, or changing accessories.

Post these instructions at work locations, provide copies to employees, and ensure everyone reads them before operating or servicing the machine. This manual is for professional use only.

The operator or employer must assess specific risks associated with each use of the machine.

Save all warnings and instructions for future reference.

2.1 Safety Signal Words

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

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

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

2.2 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 common sense and good judgment.

2.2.1 Transport

Transport of the hydraulic breaker may only be undertaken by persons who:

• Are authorized to operate a crane or fork-lift truck in conformity with applicable national directives.
• Are aware of all relevant national safety instructions and accident prevention instructions.
• Have read and understood the safety and transport chapters of this manual.

2.2.2 Installation, storage, maintenance and disposal

Installation, storage, maintenance, and disposal of the hydraulic breaker may only be undertaken by persons who:

• Are aware of all relevant national safety instructions and accident prevention instructions.
• Have read and understood the Safety and Operating Instructions.

2.2.3 Operation

Operation of the hydraulic breaker may only be undertaken by qualified carrier operators. Carrier operators are qualified if they:

• Are trained to operate a carrier in conformity with national directives.
• Are aware of all relevant national safety instructions and accident prevention instructions.
• Have read and understood the Safety and Operating Instructions.

2.2.4 Testing

Testing of the hydraulic installation must only be carried out by professional technicians authorized to approve a hydraulic installation in accordance with national directives.

2.2.5 Personal Protective Equipment

Always use approved protective equipment. Operators and others 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 overalls or similar clothing (not loose-fitting) that covers arms and legs.

2.2.6 Drugs, Alcohol or Medication

WARNING: Drugs, alcohol, or medication may impair judgment and concentration, leading to severe accidents or death. Never use the machine when tired or under the influence. No person under the influence may operate the machine.

2.3 Carrier, Precautions

Before using or transporting the carrier with the hydraulic breaker attached, read the carrier manufacturer's safety regulations and operating instructions. Ensure the carrier is equipped with adequate protective features, including a protective screen in front of the operator.

The hydraulic breaker must only be mounted on a carrier with sufficient load capacity. Insufficient load capacity can lead to instability and tipping over.

2.4 Installation, Precautions

2.4.1 Hydraulic System

DANGER: The integrated piston accumulator is pressurized. Dismounting without releasing nitrogen gas can cause serious injury or death. Fill the accumulator with Nitrogen (N2) only. Only authorized personnel may work with the accumulator.

WARNING: Hydraulic oil under high pressure can penetrate skin. Consult a doctor immediately if skin penetration occurs. Never use fingers to check for leaks. Keep face away from leaks.

WARNING: Spilled hydraulic oil can cause burns, slippery conditions, and environmental harm. Handle spilled oil according to regulations. Never dismantle the hydraulic machine when the oil is hot. Do not run hydraulic lines through the driver's cab.

CAUTION: Hydraulic oil can cause eczema. Avoid contact with skin. Use protective gloves and wash hands after contact.

2.4.2 Assembly or Disassembly

WARNING: Moving parts pose a risk of injury from leaking oil or crushed body parts. Never check passages with hands or fingers. Any boom movements must be done in cooperation with personnel mounting the breaker. Ensure quick hitch couplings are securely locked.

2.5 Operation, Precautions

DANGER: Contact with explosives or explosive gases can cause explosions, leading to severe injuries or death. Never operate in explosive environments, near flammable materials, fumes, or dust. Ensure no undetected sources of gas or explosives exist.

WARNING: Exceeding maximum operating pressure can lead to material damage and personal injury. Always run the hydraulic machine with the correct operating pressure (see "Technical data").

WARNING: Dust and fumes generated during operation can cause serious and permanent respiratory disease, illness, or other bodily injury. Some substances in dusts and fumes (e.g., crystalline silica, cement, arsenic, chromium, lead) are known carcinogens or reproductive toxins.

Dust and fumes can be invisible. Do not rely on sight alone. To reduce exposure:

• Perform site-specific risk assessments for dust and fumes.
• Use proper engineering controls (e.g., exhaust ventilation, water sprays, wet drilling) to minimize dust and fumes at the source.
• Wear, maintain, and correctly use respiratory protection as required by occupational health and safety regulations.
• Work in well-ventilated areas.
• Direct exhaust to minimize dust disturbance.
• Operate and maintain the machine as recommended.
• Select, maintain, and replace consumables/tools correctly.
• Wear washable or disposable protective clothes and shower/change before leaving the worksite.
• Avoid eating, drinking, and using tobacco products in dusty areas.
• Wash hands and face thoroughly after leaving exposure areas and before contact with others.
• Comply with all applicable laws and regulations.
• Participate in air monitoring, medical examination programs, and health and safety training.
• Consult physicians experienced with occupational medicine.
• Work with employers and trade organizations to reduce exposure and risks. Establish and implement effective health and safety programs.

Residues of hazardous substances on the machine can be a risk. Clean the machine thoroughly before maintenance.

WARNING: Electric shock hazard. The hydraulic breaker is not insulated. Contact with electric circuits can cause severe injury or death. Never work near electric circuits or power sources. Ensure no hidden electric circuits are present.

WARNING: Projectiles. Failure of the workpiece, accessories, or the breaker itself can generate high-velocity projectiles, causing bodily injury. Objects falling from height can also cause injury. To reduce risks:

• Close off the working area.
• Ensure no persons are in the danger area (20 meters horizontally and vertically) before starting.
• Immediately switch off the breaker if persons enter the danger area.
• Press the working tool against the working surface before starting.
• Never operate unless the working tool is retained with a proper tool retainer.

WARNING: Noise hazard. High noise levels can cause permanent hearing loss and tinnitus. To reduce risks:

• Perform risk assessments and implement controls.
• Operate and maintain the machine as recommended.
• Select, maintain, and replace working tools as recommended.
• Check that the silencer (if equipped) is in place and in good working condition.
• Always use hearing protection.
• Use damping material to prevent work pieces from "ringing".

2.6 Maintenance, Precautions

WARNING: Involuntary start can lead to severe injuries. Follow carrier manual instructions to prevent involuntary starts. Ensure start circuits avoid unintentional starts. Foot pedals must have a protection cover.

WARNING: Maintenance work on a pressurized hydraulic system can lead to severe injuries. Depressurize the system before performing maintenance.

WARNING: Machine modification may result in bodily injuries. Never modify the machine. Modified machines are not covered by warranty or product liability. Always use approved original parts, tools, and accessories. Change damaged parts immediately. Replace worn components promptly.

WARNING: Hot working tool. The tip gets very hot during operation and can cause burns. Never touch the hot working tool. Wait for it to cool down before activities.

WARNING: Working tool hazards. Accidental engagement of start/stop devices during maintenance or installation can cause serious injuries when the power source is connected. Never inspect, clean, install, or remove the working tool while the power source is connected.

2.7 Storage, Precautions

WARNING: Heavy hydraulic breaker and working tool. If the breaker or tool topples or falls, it can result in material damage and personal injury. Store the hydraulic breaker and working tool to prevent falling or rolling.

The hydraulic breaker must be stored in an upright position to avoid seal damage. If stored for a long time:

• Remove the breaker from the carrier.
• Clean the breaker carefully (see "Cleaning").
• Dismount the working tool (see "Mounting and dismounting the working tool").
• Lubricate the front part of the piston, wear bushing, and retainer bars.
• Store the breaker in a dry place.
• Always keep the breaker in an upright position, if stored for a long time, and ensure it cannot topple over.

8.1 How to proceed after more than twelve months' storage

WARNING: Risk of injury. Nonprofessional disassembly and assembly can lead to serious injury and property damage. Disassembly is permitted only for professionals trained by Construction Tools, following all safety instructions and repair guidelines.

Measures to prevent premature failure after over twelve months' storage:

• Contact the Epiroc Customer Center / Dealer in your area.
• Professionals trained by Construction Tools will disassemble the breaker properly and:
  • Check parts liable to corrosion for damage.
  • Rework or replace corroded parts.
  • Replace all sealing elements.

9 Disposal

Used machines must be treated and scrapped to maximize material recycling and minimize environmental impact. Before scrapping, empty and clean the machine of all hydraulic oil. Dispose of remaining hydraulic oil responsibly.

Environmental Product Compliance - Reach Declaration

Presence and names of substances in products included in the EU Reach Candidate List of Substances of Very High Concern are set out in the relevant Spare Parts Catalog for each product.

10 Troubleshooting

10.1 Hydraulic Breaker Does Not Start

10.2 Impact Force Too Low

10.3 Oil Leaks

10.4 Hydraulic Breaker Operates Too Slow

10.5 Operating Temperature Too High

11 Technical Data

11.1 Machine Data

11.2 Capacities

11.3 Noise Declaration Statement

¹ Sound pressure level according to EN ISO 3744 in accordance with directive 2000/14/EC at 10 metres distance.

² Guaranteed sound power according to EN ISO 3744 in accordance with directive 2000/14/EC inclusive spread in production.

These declared values were obtained by laboratory type testing in accordance with the stated directive or standards and are suitable for comparison with the declared values of other tools tested in accordance with the same directive or standards. These declared values are not adequate for use in risk assessments and values measured in individual workplaces may be higher. The actual exposure values and risk of harm experienced by an individual user are unique and depend upon the way the user works, in what material the breaker is used, as well as upon the exposure time and the physical condition of the user, and the condition of the breaker.

Epiroc 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 workplace situation over which Epiroc has no control.

12 EC Declaration of Conformity (EC Directive 2006/42/EC)

Epiroc hereby declares that the machines listed below conform to the provisions of EC Directive 2006/42/EC (Machinery Directive) and 2000/14/EC (Noise Directive).

Technical Documentation authorised representative:
Olof Östensson
Construction Tools PC AB
Box 703
391 27 Kalmar

General Manager:
Niclas Hejdenberg

Manufacturer:
Construction Tools PC AB
Box 703
391 27 Kalmar
Sweden

8 Storage

WARNING: Heavy hydraulic breaker and working tool. If the breaker or working tool topples or falls from where they are stored, it can result in material damage and personal injury. Store the hydraulic breaker and working tool so that falling or rolling down is prevented.

The hydraulic breaker must be stored in an upright position to avoid its seals being damaged. If the hydraulic breaker is not used for a long time, the following points have to be considered to protect the hydraulic breaker from corrosion:

1. Remove the hydraulic breaker from the carrier.
2. Clean the hydraulic breaker carefully (see chapter Cleaning).
3. Dismount the working tool (see chapter Mounting and dismounting the working tool).
4. Lubricate the front part of the piston, wear bushing, and the retainer bars.
5. Store the hydraulic breaker in a dry place.
6. Always keep the breaker in an upright position, if stored for a long time and so that it cannot topple over.

7 Maintenance

It is essential that regular maintenance is performed to maintain the breaker's maximum efficiency. Equipment that is insufficiently maintained can be dangerous for both the operator and persons near the breaker. Make sure that regular maintenance routines with lubrication are followed to keep the equipment safe and efficient.

7.1 Cleaning

NOTICE: Environmental damage due to polluted water. Hydraulic oil and chisel paste are environmentally harmful and must not penetrate the ground or enter the water table or water supplies.

• Collect the water used for cleaning if it has been contaminated by hydraulic oil and chisel paste.
• Dispose of the water in accordance with the applicable regulations to avoid environmental hazards.

7.2 Lubrication

Lubricate the working tool shank thoroughly every two hours using high-temperature grease such as genuine chisel paste from your supplier. This also lubricates the wear bushing and the retainer pin; 5-10 pumps of the grease gun is sufficient. Stop when the grease starts to emerge by the wear bushing or between the working tool and the wear bushing.

WARNING: Running engine. If the carrier's engine is running when lubricating the working tool manually, there is a risk of severe accidents. Always switch off the carrier's engine to avoid accidents.

During lubrication, the working tool must be pressed against the piston so that the space between piston and the working tool does not fill with grease.

7.3 Piston Accumulator

WARNING: Explosion hazard. Use of other gases than Nitrogen (N2) can cause an explosion. Charge the accumulator with Nitrogen (N2) only!

Epiroc offers a service box containing necessary tools and parts for servicing the piston accumulator. See the Spare parts list.

If the hammer's performance deteriorates, check the pressure in the piston accumulator. The pressure must be checked with the hammer at a working temperature between 60-70 °C (140-158 °F).

To measure pressure, bring down the hammer with no pressure on the chisel. Detach the plug from the charge valve (G) and connect the test pressure gauge. The piston accumulator needs filling only if the pressure falls below the minimum level.

Filling

1. Connect pressure relief valve (B) to gas bottle valve (A).
2. Connect gas hose (C) to pressure relief valve (B) as shown in the figure.
3. Close pressure relief valve (B).
4. Open gas bottle valve (A).
5. Remove the plug from the charge valve (G).
6. Guide the nozzle of the hose (C) into the charge valve.
7. Carefully open the relief valve (B).
8. Fill the piston accumulator.
9. Read the pressure on the pressure gauge (D).
10. Close the pressure relief valve when the desired pressure has been reached.
11. Pull the gas hose out of the charge valve (G) and fit the plug.
12. Close gas bottle valve (A).

7.4 Every Second Hour

Regularly lubricate the working tool, the tool retainer, and the bushings.

7.4.1 Lubricating with a Grease Gun

WARNING: Hot working tool during operation and a period of time after use. Avoid contact with the working tool.

WARNING: Hot hydraulic breaker during operation and a period of time after use. Avoid contact with the hydraulic breaker.

CAUTION: Skin eczema. Grease can cause eczema if it comes in contact with the skin. Avoid getting grease on your hands. Wash thoroughly after contact.

Lubricate the working tool's shank plentifully while pressing the working tool against the surface to avoid filling the cavity with grease. If the cavity is filled with grease when the hydraulic breaker is started, the lower seals may be damaged.

When the working tool shank is exposed to high pressure and high temperatures, a standard grease may melt and run. Use a genuine working tool grease from your supplier.

7.5 Every Day

• Check the tool retainer and split pin.
• Check that hoses, couplings, and accumulator are in good condition.
• Check that bolts and connections are free from damage and properly tightened. See tightening torques in the spare parts list.
• Refill the central lubricating system.

7.6 Every Week

• Clean the hydraulic breaker carefully.
• Check the wear bushing's wear and maximum inner wear limits.

The wear bushing must be replaced when the inner diameter (A) has reached its maximum wear limit (see section "Wear limits" and "Replacing the working tool bushing").

Check the working tool for wear. The working tool must be replaced when the outer diameter (B) has reached its minimum wear limit (see section "Wear limits").

Too large clearance can make the working tool break and the piston can be damaged.

• Check the breaker and the adapter plate for cracks and wear.
• Check that the accumulator screws are properly tightened. The correct tightening torque is found in the spare parts list.

NOTICE: The working tool must never be sharpened by forging. Sharpening must only be performed by milling, grinding, or turning.

7.6.1 Wear Limits

7.6.2 Replacing the Wear Bushing

The wear bushing is kept in place by the retainer pin. A new wear bushing has a slip fit.

1. If a worn out wear bushing is stuck, use a sliding hammer to remove it.
2. Carefully clean the bore and the wear bushing seat area.
3. Lubricate and mount the wear bushing.
4. Use a plastic sledgehammer to insert the wear bushing.
5. Keep the wear bushing in position with help of the retainer pin.

7.7 Every Year

Overhauling must be done after one year of continuous operation. Overhauling must for safety reasons be performed by authorized personnel at an authorized workshop.

5 Installation

Before installing the hydraulic breaker on the carrier or operating it, read the operation manual and safety instructions provided by the carrier manufacturer. Follow all instructions.

The carrier must have the appropriate hydraulic system for operation of the breaker. If the carrier is too large for the hydraulic breaker, it may lead to broken working tools and increased wear. See "Technical data" for choosing a suitable carrier.

The safety equipment in the hydraulic system must be checked for quality (CE mark, etc.), suitability, and functionality by a professional or authorized supervisor before use.

5.1 Hoses and Connections

WARNING: Whipping hydraulic hose. Hydraulic hoses under pressure can whip uncontrollably if screws loosen or are loosened. A whipping hydraulic hose can cause severe injuries.

• Depressurize the hydraulic system before loosening the connection of a hydraulic hose.
• Tighten the nuts on the connections of the hydraulic hoses to the required torque.

Type of nipple: ORFS standard nipple. Nipple dimensions can be found in the Spare parts list.

The quality of the hydraulic hoses must be 2SC (according to EN 857) or better when connecting the breaker to the carrier. If quick couplings are to be used, use the 'Flat Face' quick coupling. This type is sturdy and easy to clean. The quick coupling pressure class must agree with the carrier's working pressure.

Always clean the quick couplings before mounting or dismounting. Always plug hoses and hose nipples with tight and clean end caps when dismounting.

5.1.1 Hose Connections

Upper port

Lower port

Tightening torque for pressure and return hose

A. Tank line
B. Pressure line
C. Pressure for Contilube
D. Central lubrication point

Hose Connections

Upper port

5.2 Hydraulic Oil

Normally, the type of hydraulic oil used by the carrier also works for the hydraulic breaker. When a hydraulic breaker is connected to the carrier, the hydraulic oil gets dirty faster. Check and follow the carrier's instructions for changing oil and oil filter. It is common to change the oil filter more frequently when a hydraulic breaker is installed.

NOTICE: When delivered, the hydraulic breaker contains some mineral-based hydraulic oil. Before connecting to the carrier's hydraulic system, check the carrier's hydraulic oil type. Mixing different types of hydraulic oil may destroy lubrication quality and lead to machine damage.

Epiroc recommends the use of biologically degradable hydraulic oil to protect the environment.

5.3 Assembly

NOTICE: Always use clean oil and filling equipment.

WARNING: Falling breaker can cause injuries. Place the breaker in a safe position where it cannot fall over and cause damage.

Preparation

1. Place the breaker in a position where it is easy and safe to mount the adapter plate.

Mounting the adapter plate

1. Place a locking washer pair on each screw.
2. Tighten the screws with a spanner.
3. Always use NORDLOCK™™ washers under bolts and nuts (NORDLOCK™™ is a registered trademark of Nord-Lock AB).

Adapter plate Tightening torque

Connecting the breaker to the carrier

1. Place the breaker in a safe way during installation.
2. Carefully lower the stick of the boom into the adapter.

WARNING: Moving parts can crush and cut. Never check bores or passages with hands or fingers.

An assistant should direct the movement of the dipper arm until the bores in the dipper arm are flush with those in the adapter. Agree with the assistant on clear hand signals for use during the mounting procedure.

7. Insert the pin and lock.
8. Lift up the hydraulic breaker using the boom.
9. Extend the bucket cylinder until the bore in the toggle is flush with those in the adapter. Insert toggle pin and lock.
10. After mounting the breaker, carefully extend and retract the bucket cylinder to its full extent in each direction. It is important that the cylinder can be fully extended and retracted without any difficulty.

Connecting the hydraulic hose

1. Circulate the hydraulic oil before connecting the hydraulic breaker. This is to make sure that the hydraulic oil is clean. Use the same routine when changing the hydraulic oil hose. For further information see "The hydraulic oil".
2. Connect the pressure and return hose.
3. Run the hydraulic oil through the carrier's oil filter for approximately 3 minutes to make sure that the hoses are clean.

Adapter plate Tightening torque

3 Overview

3.1 Design and Function

EC is a range of rig-mounted hydraulic breakers designed for all kinds of demolition works. No other use is permitted.

The hydraulic breaker is operated from the driver's cab of the carrier using the carrier's hydraulic system. The breaker frequency is controlled by the oil flow from the carrier.

To choose the correct working tool, see the Spare parts list.

3.2 Main Parts

A. Hammer box
B. Percussion unit
C. Filling valve
D. Retainer pin

(Diagram showing main parts of the hydraulic breaker)

3.3 Labels

The machine is fitted with labels containing important information about personal safety and machine maintenance. The labels must be kept in good condition for readability. New labels can be ordered from the spare parts list.

3.3.1 Data Plate

(Diagram of the data plate with labels A-F)

A. Machine type
B. Maximum hydraulic oil pressure
C. Serial number
D. The warning symbol together with the book symbol means that the user must read the safety and operating instructions before the machine is used for the first time.
E. The CE symbol means that the machine is EC-approved. See the EC Declaration of Conformity delivered with the machine for more information.
F. The EAC symbol means that the machine is EAC approved.

3.3.2 Noise Level Label

(Diagram of the noise level label)

The label indicates the guaranteed noise level corresponding to EC-directive 2000/14/EC. See "Technical data" for accurate noise level.

3.3.3 Labels on the Accumulator

(Diagrams of accumulator labels)

Read through the overhaul instructions carefully before servicing or charging.

NOTICE: The accumulator must only be charged with Nitrogen. Only certified personnel are allowed to work with the accumulator.

3.4 Guarantee

The guarantee or product liability will be invalidated by:

• Use other than intended.
• Maintenance work not being carried out or being carried out incorrectly.
• The use of wrong consumables.
• The use of non-approved parts.
• Damage due to wear.
• Special applications without the required safety facilities.
• Damage due to improper storage.
• Changes not carried out by or in consultation with the manufacturer.

3.5 Scope of Delivery

The hydraulic breaker is delivered complete with:

• Hydraulic breaker
• Test gauge for wear bush
• Bolt kit for baseplate
• Safety and Operating instructions
• EC Declaration of Conformity

4 Transport

WARNING: Falling hydraulic breaker. If the hydraulic breaker is tipping over and falling, it may cause serious injury.

• Place the hydraulic breaker in a safe position where it cannot fall over and cause damage.

NOTICE: Air freight restrictions. HATCON contains an activated SIM card and an encased lithium ion battery, both regulated for air transport. Consult your forwarder or local customer center/dealer about any restrictions for air freight.

6 Operation

6.1 Preparation Before Breaking

6.1.1 Operating Temperatures

The operating temperatures of the hydraulic breaker are between -20 °C (-4 °F) and +80 °C (+176 °F).

CAUTION: Temperature hazard. The hydraulic breaker and the hydraulic oil system of the carrier can be damaged if the hydraulic breaker is used at higher or lower temperatures.

• Only start the hydraulic breaker when the hydraulic oil has reached the proper operating temperature.
• If the ambient temperature is below -20 °C (-4 °F), warm up the working tool and the hydraulic breaker before use.
• If the oil temperature exceeds +80 °C (+176 °F), do not use the hydraulic breaker as oil quality becomes inadequate, shortening the life of seals and O-rings.

6.1.2 Engine RPM

Too high engine RPM results in increased fuel consumption and increased oil temperature. Adapt the engine RPM to the recommended value to give the correct operating oil flow.

6.2 Operating

6.2.1 Risk Area

Before starting the hydraulic breaker, ensure no persons are in the risk area, 20 meters (66 ft) both horizontally and vertically from the hydraulic breaker.

(Diagram illustrating the 20m risk area)

6.2.2 Breaking

CAUTION: Machine and tool hazard. Continuous operation at full extension and/or retraction can result in damage to the hydraulic cylinders. Always avoid operating the breaker with the cylinders fully extended or retracted. Reposition the carrier and/or boom to avoid fully extended or retracted cylinders. Pay attention and look at what you are doing. Never start the hydraulic breaker until both carrier and the hydraulic breaker are in the correct position.

• Direct the hydraulic breaker in a position 90° towards the object.
• Use the correct feed pressure. Correct feed pressure ensures optimal performance, minimum vibration, and reduced wear on the bushing and inserted tool.
• Listen to the sound from the hydraulic breaker. Changes in sound may indicate bending between the working tool and bushing.
• Never run the breaker with the boom cylinders at their end positions, as this may damage the carrier.
• Start near the edge and work towards the middle. Never start in the middle of large objects.
• Never run the hydraulic breaker longer than 15 seconds on the same spot. Move the working tool to a new position if the object does not break.
• Never bend with the working tool.
• Avoid idling strokes; it causes wear on both working tool and tool retainers.

6.2.3 Use Under Water

Never use the hydraulic attachment under water. This would seriously damage the hydraulic attachment and may damage the whole hydraulic installation.

6.2.4 Special Applications

NOTICE: Always consult the Customer Center / Dealer in your area for special applications (tunnelling, high thermal load, underwater application). You can contact your nearest authorized workshop for further instructions.

5.4 Working Tool

5.4.1 Selecting the Right Working Tool

5.4.1.1 Conical Moil Point

• Very good penetration
• Regular spread of wedge action
• No torsion effect

5.4.1.2 Chisels and Spades

• Very good spread of wedge action
• Good penetration
• Torsion effect

5.4.1.3 Blunt Tool

• Very good energy application
• Optimum breaking effect
• No torsion effect

5.4.2 Mounting and Dismounting the Working Tool

WARNING: Running engine. Changing the inserted tool or accessories while the carrier's engine is running can cause serious injury. Secure the carrier against involuntary activation.

Before you start mounting or dismounting the working tool, do the following:

1. Place the hydraulic breaker on timber support blocks. The boring on the back side of the hydraulic breaker has to remain free.
2. Shut off the carrier's engine.
3. Remove the plug from the hammer box, at the retainer pin.

Dismounting the working tool:

1. Press the retainer pins out from the hole at the back upwards until you can remove it through the hole on the front side.

NOTICE: Dismount the working tool with a lifting strap to reduce the risk of crushed body parts. Some working tools are heavy, therefore lift out the working tool in a safe way.

2. Check that the O-rings and retainer pins are not worn out or damaged. Change if necessary.

Mounting the working tool:

1. Clean the retainer pins. Clean and lubricate the bushing plentifully. This is especially important when mounting a new working tool.
2. Mount the working tool.
3. Rotate the working tool to spread the grease.
4. Mount the retainer pins, and make sure they stay in the position and avoid them to fall through the boring at the back.