HiKOKI C 6U3 Circular Saw

GENERAL POWER TOOL SAFETY  WARNINGS

WARNING
Read all safety warnings, instructions, illustrations and specifi cations provided with this power tool.
Failure to follow all instructions listed below may result in electric shock, fi re 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 fl ammable 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.
  Unmodifi ed 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.

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 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 fi nger 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.

Power tool use and care

• 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 aff ect the power toolʼs 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 diff erent 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.

Service

• Have your power tool serviced by a qualifi ed repair person using only identical replacement parts.
  This will ensure that the safety of the power tool is maintained.

PRECAUTION
Keep children and infi rm persons away.
When not in use, tools should be stored out of reach of children and infi rm persons.

SAFETY INSTRUCTIONS FOR ALL SAWS

Cutting procedures

• DANGER: Keep hands away from cutting area and the blade. Keep your second hand on auxiliary handle, or motor housing.
  If both hands are holding the saw, they cannot be cut by 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 minimize 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 or its own cord. 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.

•  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 causes and related warnings

• 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. Kickback is the result of saw misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below.

• Maintain a fi rm grip with both hands 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, center 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 minimize 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.

Lower guard function

• 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 fl oor.
  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.

Riving knife function

• Use the appropriate saw blade for the riving knife. For the riving knife to function, the body of the blade must be thinner than the riving knife and the cutting width of the blade must be wider than the thickness of the riving knife.

• Adjust the riving knife as described in this instruction manual.
  Incorrect spacing, positioning and alignment can make the riving knife ineff ective in preventing kickback.

• Always use the riving knife except when plunge cutting.
  The riving knife must be replaced after plunge cutting. The riving knife causes interference during plunge cutting and can create kickback.

•  For the riving knife to work, it must be engaged in the workpiece.
  The riving knife is ineff ective in preventing kickback during short cuts.

• Do not operate the saw if the riving knife is bent. Even a light interference can slow the closing rate of a guard.

ADDITIONAL SAFETY WARNINGS

1. Use only blade diameter specifi ed on the machine.

2. Do not use any abrasive wheel.

3. Do not use saw blades which are deformed or cracked.

4. Do not use saw blades made of high speed steel.

5. Do not use saw blades which do not comply with the characteristics specifi ed in these instructions.

6. Do not stop the saw blades by lateral pressure on the disc.

7.  Always keep the saw blades sharp.

8. Ensure that the lower guard moves smoothly and freely.

9. Never use the circular saw with its lower guard fixed in the open position.

10. Ensure that the retraction mechanism of the guard system operates correctly.

11. The saw blades body must be thinner than the riving knife and the width of cut, or kerf (with teeth set) must be greater than the thickness of the riving knife.

12.  Never operate the circular saw with the saw blade turned upward or to the side.

13.  Ensure that the material is free of foreign matters such as nails.

14. The riving knife should always be used except when plunging in the middle of the workpiece.

15.  Disconnect the plug from the receptacle before carrying out any adjustment, servicing or maintenance.

16. For models C6BU3, C6BUM, C7BU3 and C7BUM, be careful of brake kickback.
    C6BU3, C6BUM, C7BU3 and C7BUM models feature an electric brake that functions when the switch is released. As there is some kickback when the brake functions, be sure to hold the main body securely.

17. Sparks can sometimes appear caused by braking operation when the switch is turned off since C6BU3, C6BUM, C7BU3 and C7BUM models employ electric brakes. Be informed, however, that this phenomenon is not a machine trouble.

18. For models C6BU3, C6BUM, C7BU3 and C7BUM, when the brake becomes ineffective, replace the carbon brushes with new ones.

19.  Ensure that the power source to be utilized conforms to the power requirements specified on the product nameplate.

20. Before the tool is plugged in to the receptacle, ensure that the power switch is in the OFF position.
    If the plug is connected to a receptacle while the power switch is in the ON position, the power tool will start operating immediately, which could cause a serious accident.

21. When the work area is removed from the power source, use an extension cord of suffi cient thickness and rated capacity. The extension cord should be kept as short as practicable.

22. Since the saw blade will extend beyond the lower surface of the lumber, place the lumber on a workbench when cutting. If a square block is utilized as a workbench, select level ground to ensure it is properly stabilized. An unstable workbench will result in hazardous operation.(Fig. 3)
    To avoid possible accident, always ensure that the portion of lumber remaining after cutting is securely anchored or held in position.

23. Should knob remain loosened, it will create a very hazardous situation. Always thoroughly clamp it. (Fig. 4)

24. It is very hazardous to allow wing bolt to remain loosened. Always thoroughly clamp it. (Fig. 5)

25. Prior to cutting operation, make sure the material you are going to cut. If the material to be cut is expected to generate harmful / toxic dusts, make sure the dust bag or appropriate dust extraction system is connected with dust outlet tightly.
    Wear the dust mask additionally, if available.

    • Should the saw blade stop or make an abnormal noise while operating, promptly turn OFF the switch.
    •  Always take care in preventing the power cord from coming near to the revolving saw blade.
    • Using the circular saw with the saw blade facing upwards or sideways is very hazardous. Such uncommon applications should be avoided.
    • When cutting materials, always wear protective glasses.
    • When finished with a job, pull out the plug from the receptacle.

26.  After having attached the saw blade, reconfi that the lock lever is firmly secured in the prescribed position.

27.  Models C6U3, C6BU3, C7U3 and C7BU3 are equipped with a blower function. However, do not use the tool for the blower function only. (Fig. 8)

28. Check that there are no nicks or scratches in the cord.

29. Check the exterior and ensure that there is no damage.

30. Use a chip saw that is for cutting wood.

31.  Use a chip saw with a displayed speed that is equal to or higher than the rotation speed displayed on the tool.

32. not leave the saw placed on top of the guide rail.

NAME OF PARTS (Fig. 1 – Fig. 23)

(A)
5| M8 bolt| *| Lock lever| a| Lock spring| v| Bar (B)
6| Washer (B)| (| Nameplate| s| Dust collecor| b| Wing-bolt
7| Saw blade| )| Knob| d| Lever (short type)| n| Base square socket
8| Lower guard| q| Cord holder| f| M4 Screw| m| Mounting screw
9| Guide| w| Incline wing-bolt| g| M5 Screw| ,| Wood chip
0| Guide piece| e| Inclined lever| h| 6 mm Hex. bar wrench| .| Parallelism adjustment screw
!| Base| r| Lumber| j| Washer (A)| /| Square
@| Inclined gauge| t| Workbench| k| Guide rail| ¡| Hex. socket set screw

| Guide fastener wing- bolt| y| M8 bolt| l| Rubber lip| ™| 3 mm Hex. bar

wrench

STANDARD ACCESSORIES

In addition to the main unit (1 unit), the package contains the accessories listed in the below.

Standard accessories are subject to change without notice.

• Saw Blade (mounted on tool) …………………………………1
• Dia. 165 mm ………C6U3, C6BU3, C6UM, C6BUM
• Dia. 190 mm ………C7U3, C7BU3, C7UM, C7BUM
• Hex. Bar wrench ………………………………………………….1
• Guide …………………………………………………………………1
• Wing-bolt ……………………………………………………………1
•  Lock Spring …………………………………………………………1
• Lever (short type) …………………………………………………1
•  Dust collector ………………………………………………………1

APPLICATIONS

Cutting various types of wood.

SPECIFICATIONS

The specifications of this machine are listed in the Table on page 157.
NOTE Due to HiKOKI’s continuing program of research and development, the specifi cations herein are subject to change without prior notice.

MOUNTING AND OPERATION

Do not use the tool with only the blower function. (C6U3, C6BU3, C7U3 and C7BU3 only)| 8| 159
Adjusting the guide piece (C6U3, C6BU3, C7U3 and C7BU3 only)| 9| 159
Cutting line| 10| 159
Regulating the guide| 11| 159
Using the cord holder| 12| 159
Mounting the dust collector set| 13| 159
Switch operation1| 14| 159
Cutting at right angles| 15| 160
Inclined cutting (+45° direction)| 16| 160
Dismounting the saw blade| 17| 160
Mounting the Saw Blade2| 18| 161
Using the guide rail3 (C6UM, C6BUM, C7UM and C7BUM only) (optional accessories)| 19| 161
Using the guide rail adapter4 (C6U3, C6BU3, C7U3 and C7BU3

only) (optional accessories)

| 20| 162
Adjusting the base and saw blade to maintain parallelism (C6UM, C6BUM, C7UM and C7BUM only)| 21| 162
Adjusting the base and saw blade to maintain perpendicularity (C6U3, C6BU3, C7U3 and C7BU3 only)| 22| 162
Adjusting the base and saw blade to maintain perpendicularity (C6UM, C6BUM, C7UM and C7BUM only)| 23| 162
Selecting accessories| ―| 164

1. Before beginning work, check to ensure that operating the switch correctly turns the tool ON and OFF.
   While the tool is plugged in to the receptacle, ensure that the sawblade stops when the switch is turned OFF.
   In some regions, it is not necessary to perform step 1.

2. Usable sawblade diameter:
   C6U3, C6BU3, C6UM, C6BUM ……. 165 to 162 mm
   C7U3, C7BU3, C7UM, C7BUM ……. 190 to 185 mm
   Body thickness: up to 1.5 mm, tip width: at least 1.9 mm
   Riving knife thickness: 1.8 mm

3. Use the guide rail when cutting in long, straight lines.
   The rubber lip of the guide rail works to prevent splintering on the cut surface. When using the guide rail for the fi rst time, cut the rubber lip as follows: Set the tool’s cutting depth to the maximum and the saw blade angle to perpendicular (0°), pull the switch completely, and cut at a slow, constant speed. After the rubber lip is cut, it can also be used for 45° angle cutting.

4. Use with C6U3, C6BU3, C7U3 and C7BU3 when using the guide rail.
   NOTE
   When performing cutting operation using the guide rail, remember that the cutting depth decreases as the thickness of the guide rail increases.

MAINTENANCE AND INSPECTION

1. Inspecting the saw blade
   Since use of as dull saw blade will degrade efficiency and cause possible motor malfunction, sharpen or replace the saw blade as soon as abrasion is noted. Inspecting the mounting screws
   Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loose, retighten them immediately. Failure to do so could result in serious hazard.
   Inspecting the carbon brushes (Fig. 24)
   The motor employs carbon brushes which are consumable parts. Since an excessively worn carbon brush can result in motor trouble, replace the carbon brushes with new ones having the same carbon brush No. ⓐ shown in the fi gure when it becomes worn to or near the “wear limit” ⓑ. In addition, always keep carbon brushes clean and ensue that they slide freely within the brush holders.

2. When replacing the new carbon brushes, always use genuine HiKOKI carbon brushes with the number specifi ed in the drawing.
   For models C6BU3, C6BUM, C7BU3 and C7BUM, the brake may not work if other than the specifi ed carbon brushes are used.
   When the brake becomes ineff ective, replace the carbon brushes with new ones.

3. Replacing carbon brushes
   Disassemble the brush caps with a slotted-head screwdriver. The carbon brushes can then be easily removed.

4.  Replacing supply cord
   If the replacement of the supply cord is necessary, this has to be done by the manufacturer of this agent in order to avoid a safety hazard.

5.  Motor unit maintenance
   The motor winding is an important part of this tool. Avoid damaging and be careful to avoid contact with cleaning oil or water.
   After 50 hours of use, clean the motor by blowing into the ventilation holes of the motor housing with dry air from an air gun or other tool (Fig. 25).
   Dust or particle accumulation in the motor can result in damage.

6.  Inspecting and maintaining the lower guard Always make sure that the lower guard moves smoothly. In the event of any malfunction, immediately repair the lower guard.
   For cleaning and maintenance, use an air gun or other tool to blow clean the space between the lower guard and gear cover as well as the rotation part of the lower guard with dry air (Fig. 25).
   Doing so is eff ective for the emission of chips or other particles.
   Accumulation of chips or other particles around the lower guard may result in malfunction or damage.

WARNING To prevent dust inhalation or eye irritation, wear protective safety goggles and a dust mask when using an air gun or other tool to clean the lower guard, ventilation holes or other parts of the product.

CAUTION
In the operation and maintenance of power tools, the safety regulations and standards prescribed in each country must be observed.

GUARANTEE

We guarantee HiKOKI Power Tools in accordance with statutory/country specifi c regulation. This guarantee does not cover defects or damage due to misuse, abuse, or normal wear and tear. In case of complaint, please send the Power Tool, undismantled, with the GUARANTEE CERTIFICATE found at the end of this Handling instruction, to a HiKOKI Authorized Service Center.

IMPORTANT
Correct connection of the plug
The wires of the main lead are coloured in accordance with the following code:
Blue: — Neutral
Brown: — Live
As the colours of the wires in the main lead of this tool may not correspond with the coloured markings identifying the terminals in your plug proceed as follows:
The wire coloured blue must be connected to the terminal marked with the letter N or coloured black. The wire coloured brown must be connected to the terminal marked with the letter L or coloured red. Neither core must be connected to the earth terminal.

NOTE
This requirement is provided according to BRITISH STANDARD 2769: 1984.
Therefore, the letter code and colour code may not be applicable to other markets except The United Kingdom. Information concerning airborne noise and vibration The measured values were determined according to EN62841 and declared in accordance with ISO 4871.
Measured A-weighted sound power level: 109 dB (A) Measured A-weighted sound pressure level: 98 dB (A) Uncertainty K: 3 dB (A).
Wear hearing protection.
Vibration total values (triax vector sum) determined according to EN62841.
Cutting chipboard:
Vibration emission value ah = 2.5 m/s2
Uncertainty K = 1.5 m/s2
The declared vibration total value has been measured in accordance with a standard test method and may be used for comparing one tool with another.
It may also be used in a preliminary assessment of exposure. WARNING

• The vibration emission during actual use of the power tool can differ from the declared total value depending in the ways in which the tool is used.
• Identify safety measures to protect the operator that are based on an estimation of exposure in the actual conditions of use (taking account of all parts of the operating cycle such as the times when the tool is switched off and when it is running idle in addition to the trigger time).

NOTE
Due to HiKOKI’s continuing program of research and development, the specifications herein are subject to change without prior notice.

Tools Required

References

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