SC 4MR-22

About these operating instructions

• Read these operating instructions before the product is used or operated for the first time. This is a prerequisite for safe, trouble-free handling and use of the product.
  
• Observe the safety instructions and warnings in these operating instructions and on the product.
  
• Always keep the operating instructions with the product and make sure that the product is accompanied by these operating instructions only, when the product is given to other persons.
  

Explanation of symbols

Warnings

Symbols in the operating instructions

	Comply with the operating instructions
	Instructions for use and other useful information
	Dealing with recyclable materials
	Do not dispose of electric equipment and batteries as household waste
	Hilti Li‑ion battery
	Hilti charger

Symbols in illustrations

	These numbers refer to the illustrations at the beginning of these operating instructions.
	The numbering reflects the sequence of operations shown in the illustrations and may deviate from the steps described in the text.
	Item reference numbers are used in the overview illustration and refer to the numbers used in the key in the product overview section.
	These characters are intended to specifically draw your attention to certain points when handling the product.

Product-dependent symbols

General symbols

	Rated speed under no load
	Direct current (DC)
	Direction-of-rotation arrow
	Revolutions per minute
	Diameter
	Saw blade
	The product supports near-field communication (NFC) technology compatible with iOS and Android platforms.
	Li-ion battery
	Never use the battery as a striking tool.
	Do not drop the battery. Never use a battery that has suffered an impact or is damaged in any other way.
	Hilti Li-ion battery type series used. Observe the information given in the section headed Intended use .
	If applied on the product, the product has been certified by this certification body for the US and Canadian markets according to the applicable standards.

Obligation symbols

Wear eye protection

Product information

• Write down the serial number in the table below. You will be required to state the product details when contacting Hilti Service or your local Hilti organization to inquire about the product.
  Product information

  Cordless circular saw	SC 4MR-22
  Generation	01
  Serial no.

General power tool safety warnings

• 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.
  

• 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 shock.
  
• 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.
  

• 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 a 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 finger on the switch or energising 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 and clothing 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.
  

• 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 remove the battery pack, if detachable, 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 and accessories. 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.
  

• Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
  
• Use power tools only with specifically designated battery packs. Use of any other battery packs may create a risk of injury and fire.
  
• When battery pack is not in use, keep it away from other metal objects, like paper clips, coins, keys, nails, screws or other small metal objects, that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fire.
  
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
  
• Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behaviour resulting in fire, explosion or risk of injury.
  
• Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 130° C (265 °F) may cause explosion.
  
• Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.
  

• 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.
  
• Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.
  

Safety instructions for all saws

• DANGER: Keep hands away from cutting area and the blade.
  
• Do not reach underneath the workpiece. The guard cannot protect you from the blade below the workpiece.
  
• Adjust the cutting depth to the thickness of the workpiece. Less than a full tooth of the blade teeth should be visible below the workpiece.
  
• Never hold the workpiece in your hands or across your leg while cutting. Secure the workpiece to a stable platform. It is important to support the work properly to minimise body exposure, blade binding, or loss of control.
  

• Hold the power tool by insulated gripping surfaces, when performing an operation where the cutting tool may contact hidden wiring. Contact with a "live" wire will also make exposed metal parts of the power tool "live" and could give the operator an electric shock.
  

• When ripping, always use a rip fence or straight edge guide. This improves the accuracy of cut and reduces the chance of blade binding.
  
• Always use blades with correct size and shape (diamond versus round) of arbour holes. Blades that do not match the mounting hardware of the saw will run off-centre, causing loss of control.
  
• Never use damaged or incorrect blade washers or bolt. The blade washers and bolt were specially designed for your saw, for optimum performance and safety of operation.
  

• kickback is a sudden reaction to a pinched, jammed or misaligned saw blade, causing an uncontrolled saw to lift up and out of the workpiece toward the operator;
  
• when the blade is pinched or jammed tightly by the kerf closing down, the blade stalls and the motor reaction drives the unit rapidly back toward the operator;
  
• if the blade becomes twisted or misaligned in the cut, the teeth at the back edge of the blade can dig into the top surface of the wood causing the blade to climb out of the kerf and jump back toward the operator.
  

• Maintain a firm grip on the saw and position your arms to resist kickback forces. Position your body to either side of the blade, but not in line with the blade. Kickback could cause the saw to jump backwards, but kickback forces can be controlled by the operator, if proper precautions are taken.
  
• When blade is binding, or when interrupting a cut for any reason, release the trigger and hold the saw motionless in the material until the blade comes to a complete stop. Never attempt to remove the saw from the work or pull the saw backward while the blade is in motion or kickback may occur. Investigate and take corrective actions to eliminate the cause of blade binding.
  
• When restarting a saw in the workpiece, centre the saw blade in the kerf so that the saw teeth are not engaged into the material. If a saw blade binds, it may walk up or kickback from the workpiece as the saw is restarted.
  
• Support large panels to minimise the risk of blade pinching and kickback. Large panels tend to sag under their own weight. Supports must be placed under the panel on both sides, near the line of cut and near the edge of the panel.
  
• Do not use dull or damaged blades. Unsharpened or improperly set blades produce narrow kerf causing excessive friction, blade binding and kickback.
  
• Blade depth and bevel adjusting locking levers must be tight and secure before making the cut. If blade adjustment shifts while cutting, it may cause binding and kickback.
  
• Use extra caution when sawing into existing walls or other blind areas. The protruding blade may cut objects that can cause kickback.
  

• Check the lower guard for proper closing before each use. Do not operate the saw if the lower guard does not move freely and close instantly. Never clamp or tie the lower guard into the open position. If the saw is accidentally dropped, the lower guard may be bent. Raise the lower guard with the retracting handle and make sure it moves freely and does not touch the blade or any other part, in all angles and depths of cut.
  
• Check the operation of the lower guard spring. If the guard and the spring are not operating properly, they must be serviced before use. Lower guard may operate sluggishly due to damaged parts, gummy deposits, or a build-up of debris.
  
• The lower guard may be retracted manually only for special cuts such as "plunge cuts" and "compound cuts". Raise the lower guard by the retracting handle and as soon as the blade enters the material, the lower guard must be released. For all other sawing, the lower guard should operate automatically.
  
• Always observe that the lower guard is covering the blade before placing the saw down on bench or floor. An unprotected, coasting blade will cause the saw to walk backwards, cutting whatever is in its path. Be aware of the time it takes for the blade to stop after switch is released.
  

Additional safety instructions

• Never tamper with or modify the product or accessories in any way.
  
• Operate the power tool only together with the safety devices that belong to it.
  
• Check that the clamping flange is securely and correctly installed each time before putting the product into operation.
  
• If you use the power tool without a dust extractor, always wear light respiratory protection when undertaking work that creates dust.
  
• Wear ear protectors. Exposure to noise can cause hearing loss.
  
• Take breaks between working and do physical exercises to improve the blood circulation in your fingers. Exposure to vibration during long periods of work can lead to disorders of the blood vessels and nervous system in the fingers, hands and wrists.
  
• The power tool is not intended for use by debilitated persons who have received no special training.
  
• Do not switch the power tool on until it is at the workplace and has been brought to its working position.
  
• Remove the battery if a problem occurs with the power tool, whenever you change accessory tools or accessories and before storing or transporting the power tool.
  
• Do not attempt to brake the power tool by applying lateral pressure to the saw blade.
  
• Before inserting the battery, check that the saw is switched off and that the switch-on interlock is activated. In this way you avoid injuries due to unintentional starting of the power tool.
  
• While the power tool is running, do not touch the clamping flange or the clamping screw.
  
• Before you lay down the power tool, wait until the power tool has come to a complete stop.
  
• Before changing the accessory tool, wait until the power tool has cooled down.
  
• Never press the drive spindle lock button while the saw blade is rotating.
  
• Never direct the power tool toward persons.
  
• The switch-on interlock must always be activated whenever you change accessories or the battery, for transport and when you are going to stow the power tool away.
  
• Always use a saw blade suitable for the material and the condition of the workpiece.
  
• Bring the saw blade into contact with the workpiece only when the circular saw is switched on.
  
• Adapt forward pressure to the saw blade and the material being cut. In this way you prevent the saw blade from stalling and possibly causing kickback.
  
• Avoid overheating the tips of the saw blade teeth.
  
• Before beginning work, check all the teeth of the saw blade for damage or missing tips. Use only saw blades with all teeth intact and complete.
  
• The rated speed of the accessory tool must be at least equal to the maximum speed marked on the power tool. Accessories running faster than their rated speed can disintegrate and fly apart.
  
• Do not work in an environment heavily contaminated with dust.
  
• Dust produced by grinding, sanding, cutting and drilling can contain dangerous chemicals. Some examples are: lead or lead-based paints; brick, concrete and other masonry products, natural stone and other products containing silicates; certain types of wood, such as oak, beech and chemically treated wood; asbestos or materials that contain asbestos. Determine the exposure of the operator and bystanders by means of the hazard classification of the materials to be worked. Implement the necessary measures to restrict exposure to a safe level, for example by the use of a dust collection system or by the wearing of suitable respiratory protection. The general measures for reducing exposure include:
  
• working in an area that is well ventilated,
  
• avoidance of prolonged contact with dust,
  
• directing dust away from the face and body,
  
• wearing protective clothing and washing exposed areas of the skin with water and soap.
  
• Always wear a dust mask that meets the requirements of the application.
  
• Before starting work, check the hazard class of the dust that will be produced when working. Use an industrial vacuum cleaner with an officially approved protection classification in compliance with locally applicable dust protection regulations.
  
• Comply with national health and safety requirements.
  
• Use clamps or some other practical means to secure the workpiece and keep it in a stable position. Attempting to stabilize the workpiece by hand or with your body is inadequate and can result in loss of control. Do not have the workpiece held in position by a helper.
  
• Do not look directly into the light source (LEDs) incorporated in the power tool and do not direct the light at other persons’ faces.
  
• Risk of injury by falling tools and/or accessories. Before starting work, check that installed accessories are secure.
  
• Before beginning work, check the guard for damage. Use the product only when the guard is undamaged.
  
• When sawing through the workpiece, ensure to protect persons and the work area on the other side. While sawing is in progress, parts of the workpiece can fall and lead to injuries.
  
• Never cut into unknown materials and keep the line of cut above and below the workpiece free of obstacles. The product can kick back if the saw blade comes into contact with an obstructing object.
  

• Metal cuttings are sharp and can lead to injuries. Keep your clothing closed so that cuttings cannot find their way into your gloves, shoes or other parts of your clothing.
  
• Pay attention to the direction in which the metal chips fly. The chips are hot and can lead to fire, burns and cut injuries. Replace the saw blade when you notice that spark formation increases.
  
• The chip collector can become very hot. Always wear protective gloves when emptying or removing the chip collector.
  

• Before beginning work, check the working area (e.g. using a detector) to ensure that no concealed electric cables or gas and water pipes are present. External metal parts of the power tool can become live, for example if you accidentally damage electric wiring. This causes an increased risk of electric shock.
  

Careful handling and use of batteries

• Comply with the following safety instructions for the safe handling and use of Li-ion batteries. Failure to comply can lead to skin irritation, severe corrosive injury, chemical burns, fire and/or explosion.
  
• Use only batteries that are in perfect working order.
  
• Treat batteries with care in order to avoid damage and prevent leakage of fluids that are extremely harmful to health!
  
• Do not under any circumstances modify or tamper with batteries!
  
• Do not disassemble, crush or incinerate batteries and do not subject them to temperatures over 80 °C (176 °F).
  
• Never use or charge a battery that has suffered an impact or been damaged in any other way. Check your batteries regularly for signs of damage.
  
• Never use recycled or repaired batteries.
  
• Never use the battery or a battery-operated power tool as a striking tool.
  
• Never expose batteries to the direct rays of the sun, elevated temperature, sparking, or open flame. This can lead to explosions.
  
• Do not touch the battery poles with your fingers, tools, jewelry, or other electrically conductive objects. This can damage the battery and also cause material damage and personal injury.
  
• Keep batteries away from rain, moisture and liquids. Penetrating moisture can cause short circuits, electric shock, burns, fire and explosions.
  
• Use only chargers and power tools approved for the specific battery type. Read and follow the relevant operating instructions.
  
• Do not use or store the battery in explosive environments.
  
• If the battery is too hot to touch, it may be defective. Put the battery in a place where it is clearly visible and where there is no risk of fire, at an adequate distance from flammable materials. Allow the battery to cool down. If it is still too hot to touch after an hour, the battery is faulty. Consult Hilti Service or read the document entitled "Instructions on safety and use for Hilti Li-ion batteries".
  
  Observe the special guidelines applicable to the transport, storage and use of lithium-ion batteries.
  Read the instructions on safety and use of Hilti Li-ion batteries that you can access by scanning the QR code at the end of these operating instructions.
  

Product overview

1. Grip
   
2. On/off switch
   
3. Switch-on interlock
   
4. Scaffold hook
   
5. Base plate
   
6. Line-of-cut indicator
   
7. Pivoting guard
   
8. Operating lever (pivoting guard)
   
9. Chip collector
   with fill level indicator
   
10. Overflow opening, dust and chips
    
11. Spindle lock button
    
12. Hex key
    
13. Unlocking lever (cutting depth adjustment)
    
14. Scale (cutting depth adjustment)
    
15. Battery
    
16. Release button, battery
    
17. Battery status indicator
    

Intended use

The product described is a cordless circular saw. It is designed for operation with one hand and for cutting metals and metal-like materials, for example steel, stainless steel, aluminum or other non-ferrous metals.

• For this product, use only Hilti Nuron lithium-ion batteries of the B 22 series. For optimum performance, Hilti recommends the batteries stated in this table for this product.

• For these batteries, use only Hilti chargers of the type series stated in this table.

Items supplied

Status indicators of the Li‑ion battery

Indicators for state of charge and fault messages

Indicators showing the battery's state of health

Product properties

Storage and operating temperatures

Battery

Charging the battery

1. Before charging the battery, read the operating instructions for the charger.
   
2. Make sure that the contacts on the battery and the contacts on the charger are clean and dry.
   
3. Use an approved charger to charge the battery.
   

Inserting the battery

1. Charge the battery fully before using it for the first time.
   
2. Push the battery into the product until it engages with an audible click.
   
3. Check that the battery is seated securely.
   

Removing the battery

1. Press the battery release button.
   
2. Remove the battery from the product.
   

Fall arrest

• Use the loop to secure the tool tether to the product as shown in the illustration. Check that it holds securely.
  
• Secure the carabiner to a load-bearing structure. Check that the carabiner holds securely.
  
  Comply with the operating instructions of the Hilti tool tether.
  

Removing the saw blade

1. Press and hold down the spindle lock button (1) .
   
2. Use the hex key to slacken the clamping screw (2) .
   
3. Remove the clamping screw and the clamping flange (3) .
   
4. Open the pivoting guard (4) and remove the saw blade (5) .
   
   If necessary, the mounting flange can be removed for cleaning.
   

Installing the saw blade

1. Clean the mounting flange and the clamping flange.
   
2. Slip the mounting flange right way round on to the arbor.
   
3. Open the pivoting guard.
   
4. Insert the new saw blade.
   
   Note the direction-of-rotation arrows on the saw blade and on the product. They must point in the same direction.
   
5. Install the outer clamping flange the right way round.
   
6. Install the clamping screw.
   
7. Insert the hex key into the saw blade clamping screw.
   
8. Press and hold down the spindle lock button.
   
9. Use the hex key to tighten the clamping screw.
   
10. Check that the saw blade is seated correctly.
    
11. Insert the hex key into the hole provided for the purpose.
    

Adjusting the cutting depth

1. Release the cutting depth adjustment clamping lever (1) .
   
2. Lift the product in a scissoring movement and set the cutting depth (2) .
   
3. Tighten the cutting depth adjustment clamping lever (3) .
   
   The cutting depth should always be set to a depth approx. 5 to 10 mm greater than the thickness of the material to be cut.
   

Switching on or off

1. Press and hold down the switch-on interlock and press the on/off button.
   
   • You can release the switch-on interlock as soon as you have the on/off switch held down.
     

2. Release the on/off switch.
   
   • The switch-on interlock jumps automatically into the locked position.
     

Sawing along a line

1. Position the workpiece so that the saw blade is free to rotate beneath it.
   
2. Secure the workpiece to prevent movement.
   
3. Bring the front edge of the base plate into contact with the workpiece.
   
   • Saw blade clear of the workpiece.
     
4. Line up the marked line with the nick in the base plate (line-of-cut indicator).
   
5. Switch the product on.
   
6. Guide the saw along the cutting line at a suitable speed for it to cut smoothly through the workpiece.
   

Sawing with or without dust and chip container

• Always install the chip collector when you are going to cut metals. Metal chips can be sharp-edged and hot and lead to injuries.
  
• Make sure that the chip collector is empty. You can see the level of fill in the viewing window in the chip collector (1) .
  
• As soon as you see dust and chips flying out of overflow opening (2) in the flap, empty the chip collector.
  
• Before using the product, make sure that the flap of the chip collector is always closed.
  

Scaffold hook

Cleaning the guard

1. Remove the saw blade.
   
2. Clean the parts of the guard carefully with a dry brush.
   
3. Use a suitable tool to remove deposits or cuttings from the inside surfaces of the parts of the guard.
   
4. Install the saw blade.
   

Cleaning chip ejector channel

1. Remove the saw blade.
   
2. Pull the chip collector up out of the guides.
   
3. Clean the chip ejector channel with a brush.
   
4. Install the saw blade.
   

Checks after cleaning and maintenance

1. To check the pivoting guard, open the guard fully by moving the guard operating lever.
   
   • The pivoting guard must close quickly and completely when the guard operating lever is released.
     
2. Check that the moving parts are in full working order, e.g. not binding or rubbing.
   
3. Examine the product for breakages and other visible damage.