CROWN CT13525-125 Electric Wall Chaser Instruction Manual

CT13525-125 Electric Wall Chaser
Instruction Manual

CT13525-125 Electric Wall Chaser

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Power tool specifications

5″
Bore Ø of diamond cutting disc| [mm] [inches]| 22,23 7/8″
Мax. thickness of diamond cutting disc| [mm] [inches]| 2,2
3/32″
Cutting depth| [mm] [inches]| 5-29 13/64″ – 1-9/64″
Cutting width| [mm] [inches]| 8-30 5/16″ – 1-3/16″
Spindle thread| | М14 5/8″-11
Weight| [kg] [lb]| 4,85 10.69
Safety class| |
Sound pressure| [dB(A)]| 97,1
Acoustic power| [dB(A)]| 108,1
Weighted vibration| [m/s2]| 3,844

Noise information

Always wear ear protection if the sound pressure exceed 85 dB(A).
Declaration of conformity
We declare under our sole responsibility that the product described under “Power tool specifications” is in conformity with all relevant provisions of the directives 2006/42/EC including their amendments and complies with the following standards:
EN60745-1,
EN60745-2-22.
Certification manager

Merit Link International AG
Stabio, Switzerland, 22.10.2019
WARNING – To reduce the risk of injury, user must read instruction manual! General safety rules
WARNING! Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and / or serious injury.
Save all warnings and instructions for future reference.
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Work area safety

• Keep work area clean and well lit. Cluttered or dark areas invite accidents.
• Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
• Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

• Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.

• Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.

• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.

• Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock1.

• When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.

• If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.
  NOTE! The term “residual current device (RCD)” may be replaced by the term “ground fault circuit interrupter (GFCI)” or “earth leakage circuit breaker (ELCB)”.

• Warning! Never touch the exposed metal surfaces on gearbox, shield, and so on because touching metal surfaces will be interfered with the electromagnetic wave, thus causing potential injury or accidents.

Personal safety

• Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.
• Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.
• Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and / or battery pack, picking up or carrying the tool. Carrying power tools with your fin- ger on the switch or energizing power tools that have the switch on invites accidents.
• Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
• Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
• Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
• If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
• Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
• Warning! Power tools can produces an electromagnetic field during operation. This field may under some circumstances interfere with active or passive medical implants. To reduce the risk of serious or fatal injury, we recommend persons with medical implants to consult their physician and the medical implant manufacturer before operating this power tool.

Power tool use and care

• The persons with lowered psychophysical or men- tal aptitudes as well as children can not operate the power tool, if they are not supervised or instructed about use of the power tool by a person responsible for their safety.
• Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
• Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
• Disconnect the plug from the power source and / or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
• Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
• Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
• Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
• Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
• Note that when you operate a power tool, please hold the auxiliary handle correctly, which is helpful when controlling the power tool. Therefore, proper holding can reduce the risk of accidents or injuries.

Service

• Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained
• Follow instruction for lubricating and changing accessories

Special safety warnings
**** The term “disc” in the safety instructions means a “diamond cutting disc” and a pair of the cutting discs.

• The power tool is designed for cutting of solid min- eral materials (for example, concrete, brickwork etc.). Do not use the power tool to cut any wood, plastic or metal. The user must be responsible for any hazard caused by improper use only. Carefully understand accident safety protection rules and safety instructions.
• The tool shall be used for dry operation only.
• Please hold insulating surface of the power tool during operation since the cutting tool may contact hidden line or built-in line. Contact with “live” line may make metal part of the tool “electrified”, and cause electric shock to the operator.

Please pay special attention to following warnings for personal safety and tool maintenance.

• Do not use any grinding disc.
• Do not use diamond cutting disc not conforming to provisions of the manufacturer.
• Do not use damaged, deformed or cracked diamond cutting disc.
• Do not work with the protective cover removed or with the front cover removed.
• Do not turn on the power tool if the diamond cutting discs are in contact with the workpiece.
• After the power tool has been turned off, it can be set aside only after a full stop of the diamond cutting discs. Do not try to slow down the rotation of the diamond cutting discs by pressing them against any surface.
• Before replacing the diamond cutting disc, adjusting the depth or width of the cutting, and also before servicing the power tool, remove the plug of the current carrying cable from the power outlet. Diamond cutting discs should not rotate.
• For operation in the occasion where the diamond cutting disc may cut the hidden line or built-in line, hold the power tool through the insulated holding surface. Contact of diamond cutting disc with live conductor may make exposed metal parts of the power tool electrified and cause electric shock to the operator.
• For “blind cutting”, be careful particularly when entering the wall or other dead zone. The diamond cutting disc may cut the gas pipe or water pipe, wire or cause object on the rebound.
• Always keep your hands at a sufficient distance from the cutting area and the diamond cutting discs. The second hand must always hold the auxiliary handle.
• Always use diamond cutting discs of the proper size and with the proper shape of the bore. If the bore of the diamond cutting disc does not coincide with the clamping parts of the power tool, the lack of alignment will lead to loss of control.
• Do not use fasteners for the diamond cutting discs (flanges, bolts, etc.) that are damaged, or fasteners of the wrong size. This may cause loss of control of the power tool.
• Please always wear the safety goggles and ear muff.
• Please wear additional protective equipment for personal safety, such as protective gloves, solid footwear, safety helmet and work apron.
• Please do not touch the wire if the power wire is damaged or cracked during operation, pull the plug immediately, and do not use power tool with damaged wire.
• Please put the wire behind the power tool during operation.
• Check to see whether there is any concealed line or pipeline within the range of operation with appropriate detector, and request support from local construction unit whenever necessary. Fire and electric shock may be caused if the cable wire is cut through during operation. Damage to gas pipe may cause explosion. Cutting off the water pipe may cause financial loss and make the power tool operator subject to electric shock accordingly.
• Hold the insulated handle to operate the power tool when operating in a hidden place with buried wire. Metal parts of the power tool may be electrified in case that the power tool is in contact with “live” cable, and electric shock will be caused thereby.
• Install and use the diamond cutting discs as recommended by the manufacturer.
• The permissible speed of the diamond cutting discs must be not less than the idling speed of the power tool.
• Before use, check the integrity of the diamond cutting discs. Install the diamond cutting discs correctly. Make sure that the diamond cutting discs do not rub against any parts during operation. After installation, turn on the power tool and let it idle for at least 30 seconds. Do not use damaged or deformed diamond cutting discs, as well as discs that have vibration or beat.
• Pay attention to the size of the diamond cutting discs. The bore of the diamond cutting discs must exactly match the shape and size of the flange.
• Handle the diamond cutting discs with care. Protect them from shocks, jolts or grease.
• Do no process materials containing asbestos.
• Fix the workpiece. Clip the workpiece more safely and steadily with fixed tooling or bench screw.
• First turn on the power tool, then bring it to the sur- face of the material for processing. Keep both hands well away from rotating diamond cutting discs.
• Stop the power tool immediately if powerful rebound is caused due to jamming of the diamond cutting disc during operation.
• Turn off the power tool before putting it off. Do not lay down the power tool until the diamond cutting discs have come to a complete stop.
• Do not hand over the power tool to children for operation.
• We can guarantee the power tool performance if only using accessories specified for the power tool.

Kickback and related warnings

Kickback is a sudden reaction to a pinched or snagged rotating diamond cutting disc. Pinching or snagging causes rapid stalling of the rotating diamond cutting disc which in turn causes the uncontrolled power tool to be forced in the direction opposite of the diamond cutting disc’s rotation at the point of the binding.
For example, if an diamond cutting disc is snagged or pinched by the workpiece, the edge of the disc that is entering into the pinch point can dig into the surface of the material causing the disc to climb out or kick out. The diamond cutting disc may either jump toward or away from the operator, depending on direction of the disc’s movement at the point of pinching. Abrasive discs may also break under these conditions.
Kickback is the result of power tool misuse and / or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below

• Maintain a firm grip on the power tool and position your body and arm to allow you to resist kickback forces. Always use auxiliary handle, if provided, for maximum control over kickback or torque reaction during start-up. The operator can control torque reactions or kickback forces, if proper precautions are taken.
• Never place your hand near the rotating accessory. Accessory may kickback over your hand.
• Do not position your body in line with the rotating diamond cutting disc. Kickback will propel the power tool in direction opposite to the disc’s movement at the point of snagging.
• Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the diamond cutting disc. Corners, sharp edges or bouncing have a tendency to snag the rotating diamond cutting disc and cause loss of control or kickback.
• Do not attach a saw chain, woodcarving blade, segmented diamond disc with a peripheral gap greater than 10 mm or toothed saw blade. Such accessories create frequent kickback and loss of control.
• Do not “jam” the diamond cutting disc or apply excessive pressure. Do not attempt to make an excessive depth of cut. Overstressing the diamond cutting disc increases the loading and susceptibility to twisting or binding of the disc in the cut and the possibility of kickback or disc breakage.
• When diamond cutting disc is binding or when interrupting a cut for any reason, switch off the power tool and hold the power tool motionless until the disc comes to a complete stop. Never attempt to remove the disc from the cut while the disc is in motion otherwise kickback may occur. Investigate and take corrective action to eliminate the cause of disc binding.
• Do not restart the cutting operation in the workpiece. Let the diamond cutting disc reach full speed and carefully re-enter the cut. The disc may bind, walk up or kickback if the power tool is restarted in the workpiece.
• Support panels or any oversized workpiece to minimize the risk of diamond cutting disc inching and kickback. Large workpieces tend to sag under their own weight. Supports must be placed under the workpiece near the line of cut and near the edge of the workpiece on both sides of the disc.
• Use extra caution when making a “pocket cut” into existing walls or other blind areas. The pro- trading disc may cut gas or water pipes, electrical wiring or objects that can cause kickback

Safety guidelines during power tool operation

Cut-off machine safety warnings

• The guard provided with the power tool must be securely attached to the power tool and positioned for maximum safety, so the least amount of disc is exposed towards the operator. Position yourself and bystanders away from the plane of the rotating disc. The guard helps to protect operator from broken disc fragments and accidental contact with disc.
• Use only bonded reinforced or diamond cutting disc for your power tool. Just because an accessory can be attached to your power tool, it does not assure safe operation.
• The nominal speed of the diamond cutting discs must be no less than the maximum speed indicated on the power tool. Otherwise, diamond cutting discs may collapse and their fragments will fly apart.
• Use the diamond cutting discs only for their intended purpose. For example, do not grind the part with the side of the disc. The diamond cutting discs are designed to work with their edge. The impact of lateral forces may lead to their destruction.
• Always use undamaged disc flanges that are of correct diameter for your selected disc. Proper disc flanges support the disc thus reducing the possibility of disc breakage.
• The outside diameter and the thickness of your accessory must be within the capacity rating of your power tool. Incorrectly sized accessories cannot be adequately guarded or controlled.
• The arbor size of discs and flanges must properly fit the spindle of the power tool. Discs and flanges with arbor holes that do not match the mounting hardware of the power tool will out of balance, vibrate excessively and may cause loss of control.
• Do not use damaged discs. Before each use, inspect the discs for chips and cracks. power tool or disc is dropped, inspect for damage or install an undamaged disc. After inspecting and installing the disc, position yourself and bystanders away from the plane of the rotating disc and run the power tool at maximum no load speed for one minute. Damaged disc will normally break apart dur- ing this test time.
• Wear personal protective equipment. Depend- ing on application, use face shield, safety goggles safety glasses. As appropriate, wear dust mask, hearing protectors, gloves and shop apron capable of stopping small abrasive or workpiece fragments. The eye protection must be capable of stopping flying debris generated by various operations. The dust mask or respirator must be capable of filtrating particles generated by your operation.. Prolonged exposure to high intensity noise may cause hearing loss.
• Keep bystanders a safe distance away from work area. Anyone entering the work area must wear personal protective equipment. Fragments of workpiece or of a broken disc may fly away and cause injury beyond immediate area of operation.
• Hold the power tool by insulated gripping surfaces only, when performing an operation where the diamond cutting disc may contact hidden wiring or its own cord. Diamond cutting disc contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator electric shock.
• Position the cord clear of the spinning diamond cutting disc. If you lose control, the cord may be cut or snagged and your hand or arm may be pulled into the spinning disc.
• Never lay the power tool down until the diamond cutting disc has come to a complete stop. The spinning disc may grab the surface and pull the power tool out of your control.
• Do not run the power tool while carrying it at your side. Accidental contact with the spinning diamond cutting disc could snag your clothing, pulling the disc into your body.
• Do not operate the power tool near flammable materials. Sparks could ignite these materials.
• Do not use diamond cutting disc that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.
• Avoid stopping the power tool motor when under load..
• Avoid overheating your power tool, when using it for a long time.
• Never operate the power tool over your head level.
• During operation, the diamond cutting discs become very hot. Do not touch them before they cool.
• If, during operation, the power supply is suddenly interrupted, to avoid accidental switching on of the power tool, immediately put the on / off switch to the off position.
• It is strictly forbidden to slow down the rundown of the diamond cutting discs using a spindle lock or by applying force to the lateral surface of the discs. Using the spindle lock for this purpose will put the power tool out of action and deprive you of the right to warranty service.

Caution! Be careful when cutting slots in load-bearing walls. DIN 1053 part 1 or country-specific regulations apply to the slots in the load-bearing walls. These regulations must be complied with. Before starting work, consult a responsible static specialist, architect or foreman.
Warning: the chemical substances contained in dust generated in sanding, cutting, sawing, grinding, drilling and other construction industry activities may result in cancer, congenital deficiency or be harmful to the fertility. The ion of some chemical substances shall be:

• Before any repair and replacement work to the machine, the power plug must be pulled out firstly.
• The transparent two silicon oxide and other masonry products in the wall bricks and cement; the chromium arsenic (CCA) in wood with chemical treatment. The harm degree of these substances shall depend on the frequent degree of you carrying out these works. If you want to reduce the contact with these chemical substances, please work in the place with ventilation and you shall use the appliances with safety certificates (such as the dust mask designed with tiny dust filter).

Notice the power voltage: in power connection, you must confirm that if the power voltage is the same to the voltage marked in the tool’s data plate. If the power voltage is higher than the appropriate voltage, the accidents will be resulted to the operators, and at the same time, the tool will be destroyed. Therefore, if the power voltage has not been confirmed, then you shall never plug in arbitrarily. On the contrary, when the power voltage is lower than the required voltage, the motor will be damaged.

Symbols used in the manual

Following symbols are used in the operation manual, please remember their meanings. Correct interpret- tion of the symbols will allow correct and safe use of the power tool.

Sections marked gray – soft grip (with insulated surface).
| Serial number sticker:
CT… – model;
XX – date of manufacture;
XXXXXXX – serial number.
| Read all safety regulations and instructions.
| Wear safety goggles.
| Wear ear protectors.
| Wear a dust mask.
| Disconnect the power tool from the mains before installation or adjustment.
| Risk of damage to hidden wiring or household service lines.
| Movement direction.
| Rotation direction.
| Locked
| Unlocked.
| Prohibited.
| Attention. Important.
| Double insulation / protection class.
| A sign certifying that the product complies with essential requirements of the EU directives and harmonized EU standards.
| Useful information.
| Wear protective gloves.
| During operation, remove the accumulated dust.
****| Do not dispose of the power tool in a domestic waste container.

Power tool designation
The power tool is designed for cutting straight-line grooves in various materials (concrete, brick, stone, etc.).
The power tool is designed for right-handed users only.

Power tool components

• Optional extra
  Not all of the accessories illustrated or described are included as standard delivery.
  Installation and regulation of power tool elements
  Before carrying out any works on the power tool it must be disconnected from the mains.
  ** Do not draw up the fastening elements too tight to avoid damaging the thread.
  Additional handle (see fig. 1)
  Always use the additional handle 11 when operating.
  Fig. 1 shows the steps for mounting / dismounting an additional handle 11.
  Installation / replacement of the diamond cutting discs, setting the width of the cut slot (see fig. 2-8)
  Note: always replace the diamond cutting discs in pairs. Do not use old and new diamond cutting discs at the same time.
  ** After installing the diamond cutting discs, before starting work, perform a test run: turn on the power tool and let it work at idle for at least 30 seconds. It is prohibited to use the diamond cutting discs with a beat or causing increased vibration of the power tool.
  When used for a long time, the diamond cutting discs can become very hot; remove them having gloves put on your hands.
  Complete disassembly (see fig. 2-4, 8)
  Figures 2-4 show the process of complete disassembly. In this case, the front cover 26 is removed and full access to all parts and the space inside the protective casing 7 is provided. This allows thorough cleaning of all parts, as well as monitoring their condition.

  • Unscrew the wing screw 14, remove the nut 23 and the pointer 24, and then move the base plate 16 (see fig. 2.1).
  • Remove the bolts 25 with a Allen key with handle 21 and remove the front cover 26 (see. fig. 2.2).
  • Press and hold the spindle lock 2, then with the flange wrench 20 unscrew the external flange 27 (see. fig. 3.1). Note: the external flange 27 has a left-hand thread.
  • If during the operation, the external flange 27 has got too tight, it is recommended to use a Allen key 19 (see fig. 3.2) to hold the spindle 28. Insert the Allen key 19 into the axial hole of the spindle 28 and holding it in the fixed position, unscrew the external flange 27 with the flange wrench 20 (see. fig. 3.2). Note: the external flange 27 has a left-hand thread.
  • Remove from the spindle 28: diamond cutting disc 18, distance washers 29, diamond cutting disc 18 and internal flange 30 (see. fig. 4).
  • Clean all parts with a soft brush and install on the spindle 28: internal flange 30, diamond cutting disc 18, distance washers 29, diamond cutting disc 18. Screw by hand the external flange 27 onto the threaded end of the spindle 28.
  • When installing parts on the spindle 28, you can change the width of the cut slot by changing the quantity of the distance washers 29 installed between the diamond cutting discs 18 (see fig. 8).

Attention! observe the following rules during installation:

• follow the mounting sequence (see fig. 4, 8);
• do not allow distortion of the parts during installation;
• when installing the diamond cutting discs 18, make sure that the diameter of their bores corresponds to the diameter of the neck of the internal flange 30;
• the direction of the arrow on the diamond cutting discs 18 must always coincide with the direction of the arrow on the front cover 26;
• Note: regardless of the width of the cut slot, always install all distance plates 29 (only the order of their installation changes), otherwise fixing of the diamond cutting discs 18 will not be ensured;
• at least one distance washer 29 must always be installed between the diamond cutting discs 18
• Holding the spindle 28 in the fixed position, using one of the methods described above, tighten the external flange 27 with the help of the flange wrench 20 (see fig. 3).
• Install the front cover 26 and tighten the bolts 25 with the Allen key with handle 21 (see. fig. 2.2).
• Return the base plate 16 to its initial position, set the pointer 24, the nut 23 and screw in the wing screw 14 (see fig. 2.1).

Incomplete disassembly (see fig. 5-7, 8)
Figures 5-7 show the process of incomplete disassembly.
In this case, the front cover 26 is not removed, and all assembly operations are carried out through a special hole in the front cover 26.
This speeds up the process of replacing the diamond cutting discs 18, as well as setting the width of the cut slot.

• Unscrew the wing screw 14, remove the nut 23 and the pointer 24, and then move the base plate 16 (see fig. 5.1).
• Loosen the wing screw 12 and move the cover 13 upwards, as shown in figure 5.2.
• Press and hold the spindle lock 2, then with the flange wrench 20 unscrew the external flange 27 (see. fig. 6.1). Note: the external flange 27 has a left-hand thread.
• If during the operation, the external flange 27 has got too tight, it is recommended to use a Allen key 19 (see fig. 6.2) to hold the spindle 28. Insert the Allen key 19 into the axial hole of the spindle 28 and holding it in the fixed position, unscrew the external flange 27 with the flange wrench 20 (see. fig. 6.2). Note: the external flange 27 has a left-hand thread.
• Remove from the spindle 28: diamond cutting disc 18, distance washers 29, diamond cutting disc 18 and internal flange 30 (see. fig. 7).
• Clean all parts with a soft brush and install on the spindle 28: internal flange 30, diamond cutting disc 18, distance washers 29, diamond cutting disc 18. Screw by hand the external flange 27 onto the threaded end of the spindle 28.
• When installing parts on the spindle 28, you can change the width of the cut slot by changing the quantity of the distance washers 29 installed between the diamond cutting discs 18 (see fig. 8).

Attention! observe the following rules during installation:

• follow the mounting sequence (see fig. 7, 8);
• do not allow distortion of the parts during installation;
• when installing the diamond cutting discs 18, make sure that the diameter of their bores corresponds to the diameter of the neck of the internal flange 30;
• the direction of the arrow on the diamond cutting discs 18 must always coincide with the direction of the arrow on the front cover 26;
• Note: regardless of the width of the cut slot, always install all distance plates 29 (only the order of their installation changes), otherwise fixing of the diamond cutting discs 18 will not be ensured;
• at least one distance washer 29 must always be installed between the diamond cutting discs 18.
• Holding the spindle 28 in the fixed position, using one of the methods described above, tighten the external flange 27 with the help of the flange wrench 20 (see fig. 6).
• Move the cover 26 down and tighten the wing screw 12 (see. fig. 5.2).
• Return the base plate 16 to its initial position, set the pointer 24, the nut 23 and screw in the wing screw 14 (see fig. 5.1).

Initial operation of the power tools

Always use the correct supply voltage: the power supply voltage must match the information quoted on the power tool identification plate.
Switching the power tool on / off
Short-term switching on / off
To switch on, press and hold on / off switch 9, to switch off – release it
Long-term switching on / off Switching on:
Push on / off switch 9 and lock it in the position with lock-on button 8.
Switching off:
Push and release on / off switch 9.
Dust suction during the power tool operation
Dust suction allows reducing dust concentration in the air and prevents its accumulation at the workplace. While operating the power tool, always use a vacuum cleaner suitable for collecting process-generated dust. Vacuum cleaner can be connected to the  adapter 4 (a special adapter may be required).
Recommendations on the power tool operation
Setting the slot depth (see fig. 9)
Before starting the work, adjust the slot depth.

• Loosen the wing screw 14 (see fig. 9).
• Set the desired cutting depth by raising or lowering the body of the power tool. The set value of the slot cutting depth is indicated by the pointer 24 on the scale 15.
• Tighten the wing screw 14.

General operational recommendations (see fig. 10-13)
The performance and quality of the cut depends on the type of the diamond cut- ting discs, so choose them correctly depending on the material being processed and the type of work.

• Adjust the slot width and depth as described above.
• Connect the power tool to a proper dust extraction device.
• Place the back of the base plate 16 on the surface to be treated so that the diamond cutting discs 18 do not touch the surface (see fig. 10.1).
• Turn on the power tool, wait until the motor reaches its maximum speed, and gently lower the power tool until the base plate 16 adheres to the surface to be treated with the entire plane, then start moving the power tool (see fig. 10.2).
• Note: cutting should always be carried out in the direction shown in figure 11. When cutting in the opposite direction, there is a danger of uncontrolled ejection of the power tool from the cut towards the user, which can lead to serious injuries.
• Do not move the power tool too quickly. It takes time to complete the operation. Excessive force when moving will not give the best results, but will overload the motor of the power tool, and the diamond cutting discs 18 will wear out faster.
• Move the power tool along the cutting line without distorting and without making oscillatory and jerky movements. Make sure that roller 5 rolls over the treated surface. This will facilitate the work.
• When cutting horizontal or inclined grooves, you may make guides that are attached to the treated surface. Move the power tool, resting the side surface of the base plate 16 on the guide (see fig. 12). This will facilitate the work.
• After making the cut, remove residual material from the slot using the break-out tool 22 (see fig. 13).
• When making openings in the walls, make cuts along the contour of the opening, setting the maximum depth of the slot. Remove residual material from the groove with a perforator. This will speed up the work, and the contour of the opening will be smooth without chipping.
• After the work has been completed, remove the diamond cutting discs 18 from the cuts and turn off the power tool. Wait until the diamond cutting discs 18 are completely stopped and only then put off the power tool.
• Turn on the power tool before the diamond cutting disc 18 touches the workpiece. Wait until the diamond cutting disc 18 has reached its maximum speed.

Note: the adapter for the vacuum cleaner 4, as well as the diamond cutting discs 18, get very hot during operation; do not touch them until they cool down.
Special aspects of using the diamond cutting discs

• When cutting particularly hard materials, such as concrete with a high content of gravel, stone, etc., the diamond cutting discs 18 can overheat and fail. It is indicated by the appearance of ring sparks rotating along with diamond cutting discs 18.
• In this case, remove the power tool from the cut and let it idle at low speed to allow the diamond cutting discs 18 to cool.
• A noticeable decrease in performance and rotating ring sparks indicate that the diamond cutting discs 18 have become dull. You can try sharpening them by making a few short cuts in an abrasive material (for example, in silicate brick). If this does not work, the diamond cutting discs 18 must be replaced.

Power tool maintenance / preventive measures
Before carrying out any works on the power tool it must be disconnected from the mains.
Cleaning of the power tool
An indispensable condition for a safe long-term exploitation of the power tool is to keep it clean. Regularly flush the power tool with compressed air thought the ventilation slots 1.
After-sales service and application service
Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts. Information about service centers, parts diagrams and information about spare parts can also be found under: www.crown-tools.com.

Transportation of the power tools

• Categorically not to drop any mechanical impact on the packaging during transport.
• When unloading / loading is not allowed to use any kind of technology that works on the principle of clamping packaging.

Environmental protection

**** Recycle raw materials instead of disposing as waste.
Power tool, accessories and packaging should be sorted for environment- friendly recycling. The plastic components are labelled for categorized recycling.
These instructions are printed on recycled paper manufactured without chlorine.

Merit Link International AG P.O.
Box 641, CH-6855 Stabil
Switzerland
www.meritlink.com

References

• CROWN Power tools - Accessories - Garden tools - Air tools

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