Hitachi Koki C 7SB2 User manual

DOUBLE INSULATION
C 7SB2
SAFETY INSTRUCTIONS AND HANDLING INSTRUCTIONS
WARNING
IMPROPER OR UNSAFE use of this power tool can result in death or serious
bodily injury!
This Handling Instructions contains important information about product safety.
Please read and understand this manual BEFORE operating the power tool. Please
keep this Handling Instructions available for other users and owners before they
use the power tool. This Handling Instructions should be stored in safe place.
Model Circular saw

2
CONTENTS
Page
IMPORTANT SAFETY INFORMATION .............. 3
MEANINGS OF SIGNAL WORDS ...................... 3
SAFETY .................................................................... 4
GENERAL SAFETY RULES ................................. 4
SPECIFIC SAFETY RULES AND SYMBOLS ....... 6
DOUBLE INSULATION FOR SAFER
OPERATION ................................................. 11
FUNCTIONAL DESCRIPTION .................................. 12
NAME OF PARTS ................................................ 12
SPECIFICATIONS ................................................ 12
Page
ASSEMBLY AND OPERATION ............................... 13
APPLICATIONS ................................................... 13
PRIOR TO OPERATION ....................................... 13
ADJUSTING THE SAW PRIOR TO USE ............. 15
CUTTING PROCEDURES .................................... 16
MOUNTING AND DISMOUNTING THE SAW
BLADE ........................................................... 17
MAINTENANCE AND INSPECTION ....................... 19
ACCESSORIES ......................................................... 21
STANDARD ACCESSORIES ............................... 21

3
IMPORTANT SAFETY INFORMATION
Read and understand all of the safety precautions, warnings and operating instructions in
the Handling Instructions before operating or maintaining this power tool.
Most accidents that result from power tool operation and maintenance are caused by the
failure to observe basic safety rules or precautions. An accident can often be avoided by
recognizing a potentially hazardous situation before it occurs, and by observing appropriate
safety procedures.
Basic safety precautions are outlined in the “SAFETY” section of this Handling Instructions
and in the sections which contain the operation and maintenance instructions.
Hazards that must be avoided to prevent bodily injury or machine damage are identified by
WARNINGS on the power tool and in this Handling Instructions.
NEVER use this power tool in a manner that has not been specifically recommended by
HITACHI.
MEANINGS OF SIGNAL WORDS
WARNING indicates a potentially hazardous situations which, if ignored, could result in
death or serious injury.
CAUTION indicates a potentially hazardous situations which, if not avoided, may result in
minor or moderate injury, or may cause machine damage.
NOTE emphasizes essential information.

4
SAFETY
GENERAL SAFETY RULES
WARNING: Read and understand all instructions.
Failure to follow all instructions listed below, may result in electric shock,
fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
1. Work Area
(1) Keep your work area clean and well lit. Cluttered benches and dark areas invite
accidents.
(2) 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 of fumes.
(3) Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control.
2. Electrical Safety
(1) Double Insulated tools are equipped with a polarized plug (one blade is wider than
the other.) This plug will fit in a polarized outlet only one way. If the plug does not
fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified
electrician to install a polarized outlet. Do not change the plug in any way. Double
Insulation eliminates the need for the three wire grounded power cord and
grounded power supply system.
(2) Avoid body contact with grounded surfaces such as pipes, radiators, ranges and
refrigerators. There is an increased risk of electric shock if your body is grounded.
(3) Do not expose power tools to rain or wet conditions. Water entering a power tool
will increase the risk of electric shock.
(4) Do not abuse the cord. Never use the cord to carry the tools or pull the plug from
a receptacle. Keep cord away from heat, oil, sharp edges or moving parts. Replace
damaged cords immediately. Damaged cords increase the risk of electric shock.
(5) When operating a power tool outside, use an outdoor extension cord marked “W-
A” or “W”. These cords are rated for outdoor use and reduce the risk of electric
shock.
3. Personal Safety
(1) Stay alert, watch what you are doing and use common sense when operating a
power tool. Do not use tool while tired or under the influence of drugs, alcohol, or
medication. A moment of inattention while operating power tools may result in
serious personal injury.
(2) Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep
your hair, clothing, and gloves away from moving parts. Loose clothes, jewelry, or
long hair can be caught in moving parts.

5
(3) Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools
with your finger on the switch or plugging in tools that have the switch on invites
accidents.
(4) Remove adjusting keys or wrenches before turning the tool on. A wrench or a key
that is left attached to a rotating part of the tool may result in personal injury.
(5) Do not overreach. Keep proper footing and balance at all times. Proper footing and
balance enables better control of the tool in unexpected situations.
(6) Use safety equipment. Always wear eye protection. Dust mask, nonskid safety
shoes, hard hat, or ear plugs must be used for appropriate conditions.
4. Tool Use and Care
(1) Use clamps or other practical way to secure and support the workpiece to a stable
platform. Holding the work by hand or against your body is unstable and may lead
to loss of control.
(2) Do not force tool. Use the correct tool for your application. The correct tool will do
the job better and safer at the rate for which it is designed.
(3) Do not use tool if switch does not turn it on or off. Any tool that cannot be controlled
with the switch is dangerous and must be repaired.
(4) Disconnect the plug from the power source before making any adjustments,
changing accessories, or storing the tool. Such preventive safety measures reduce
the risk of starting the tool accidentally.
(5) Store idle tools out of reach of children and other untrained persons. Tools are
dangerous in the hands of untrained users.
(6) Maintain tools with care. Keep cutting tools sharp and clean. Properly maintained
tools, with sharp cutting edges are less likely to bind and are easier to control.
(7) Check for misalignment or binding of moving parts, breakage of parts, and any
other condition that may affect the tool's operation. If damaged, have the tool
serviced by a HITACHI authorized service center before using. Many accidents are
caused by poorly maintained tools.
(8) Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one tool, may become hazardous when used
with another tool.
5. Service
(1) Tool service must be performed only by a HITACHI authorized service center. Service
or maintenance performed by unqualified personnel could result in a risk of injury.
If the supply cord is damaged, it shall be replaced by the manufacturer or its service
agent or similarly qualified person in order to avoid a hazard.
(2) When servicing a tool, use only identical replacement parts. Follow instructions in
the Maintenance section of this Handling Instructions. Use of unauthorized parts
or failure to follow Maintenance Instruction may create a risk of electric shock or
injury.

6
SPECIFIC SAFETY RULES AND SYMBOLS
1. DANGER! Keep hands away from cutting area and 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.
Keep your body positioned to either side of the saw blade, but not in line with the saw
blade. KICKBACK could cause the saw to jump backwards. (See "Causes and Operator
Prevention of Kickback")
Do not reach underneath the work. The guard can not protect you from the blade
below the work.
2. Check lower guard for proper closing before each use. Do not operate saw if lower
guard does not move freely and close instantly. Never clamp or tie the lower guard
into the open position. If saw is accidentally dropped, 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.
3. Check the operation and condition 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 buildup of debris.
4. Lower guard should be retracted manually only for special cuts such as “Pocket Cuts”
and “Compound Cuts.”Raise lower guard by Retracting Handle. As soon as blade
enters the material, lower guard must be released. For all other sawing, the lower
guard should operate automatically.
5. Always observe that the lower guard is covering the blade before placing 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.
6. NEVER hold piece being cut in your hands or across your leg. It is important to support
the work properly to minimize body exposure, blade binding, or loss of control.
7. Hold 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 tool “live”and shock the operator.
8. When ripping always use a rip fence or straight edge guide. This improves the accuracy
of cut and reduces the chance for blade binding.
9. Always use blades with correct size and shape (diamond vs. round) arbor holes. Blades
that do not match the mounting hardware of the saw will run eccentrically, causing
loss of control.
10. Never use damaged or incorrect blade washers or bolts. The blade washers and bolt
were specially designed for your saw, for optimum performance and safety of operation.
11. Causes and Operator Prevention of Kickback:
Kickback is a sudden reaction to a pinched, bound, 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 bound 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 operator.

7
Kickback is the result of tool misuse and/or incorrect operating procedures or conditions
and can be avoided by taking proper precautions as given below:
12. Maintain a firm grip with both hands on the saw and position your body and arm to
allows you to resist KICKBACK forces. KICKBACK forces can be controlled by the
operator, if proper precautions are taken.
13. 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.
14. When restarting a saw in the workpiece, center the saw blade in the kerf and check
that saw teeth are not engaged into the material. If saw blade is binding, it may walk
up or KICKBACK from the workpiece as the saw is restarted.
15. 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 as shown in Fig. 1.
To minimize the risk of blade pinching and kickback. When cutting operation requires
the resting of the saw on the work piece, the saw shall be rested on the larger portion
and the smaller piece cut off.
To avoid kickback, do support board Don't support board or panel away
or panel near the cut. from the cut.
Fig. 1 Fig. 2
16. Do not use dull or damaged blade. Unsharpened or improperly set blades produce
narrow kerf causing excessive friction, blade binding and KICKBACK.
17. Blade depth and bevel adjusting locking levers must be tight and secure before making
cut. If blade adjustment shifts while cutting, it may cause binding and KICKBACK.
18. Use extra caution when making a “Pocket
Cut”into existing walls or other blind
areas.
The protruding blade may cut objects that
can cause KICKBACK.
NEVER place your hand or fingers behind
the saw. If kickback occurs, the saw could
easily jump backwards over your hand,
possibly causing severe injury.
Fig. 3
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19. Adjustments. Before cutting be sure depth and bevel adjustments are tight.
20. Avoid cutting nails. Inspect for and remove all nails from work piece before cutting.
21. When operating the saw, keep the cord away from the cutting area and position it so
that it will not be caught on the workpiece during the cutting operation.
Operate with proper hand support, proper workpiece support, and supply cord routing
away from the work area.
WARNING: It is important to support the work piece properly and to hold the saw
firmly to prevent loss of control which could cause personal injury. Fig. 4 illustrates
typical hand support of the saw.
A TYPICAL ILLUSTRATION OF PROPER HAND SUPPORT
WORKPIECE SUPPORT, AND SUPPLY CORD ROUTING.
Fig. 4
22. Place the wider portion of the saw base on that part of the work piece which is solidly
supported, not on the section that will fall off when the cut is made. As examples, Fig.
5 illustrates the RIGHT way to cut off the end of board, and Fig. 6 the WRONG way. If
the work piece is short or small, clamp it down.
DON’T TRY TO HOLD SHORT PLACES BY HAND!
Fig. 5 Fig. 6
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23. Never attempt to saw with the circular saw
held upside down in a vise. This is extremely
dangerous and can lead to serious accidents.
(Fig. 7)
24. Before setting the tool down after completing a cut, be sure that the lower (telescoping)
guard has closed and the blade has come to a complete stop.
25. Never touch moving parts.
Never place your hands, fingers or other body parts near the tool’s moving parts.
26. Never operate without all guards in place.
Never operate this tool without all guards or safety features in place and in proper
working order. If maintenance or servicing requires the removal of a guard or safety
feature, be sure to replace the guard or safety feature before resuming operation of the
tool.
27. Use right tool.
Don’t force small tool or attachment to do the job of a heavy-duty tool.
Don’t use tool for purpose not intended —for example—don’t use circular saw for
cutting tree limbs or logs.
28. Never use a power tool for applications other than those specified.
Never use a power tool for applications other than those specified in the Handling
Instructions.
29. Handle tool correctly.
Operate the tool according to the instructions provided herein. Do not drop or throw
the tool. Never allow the tool to be operated by children, individuals unfamiliar with its
operation or unauthorized personnel.
30. Keep motor air vent clean.
The tool’s motor air vent must be kept clean so that air can freely flow at all times.
Check for dust build-up frequently.
31. Operate power tools at the rated voltage.
Operate the power tool at voltages specified on their nameplates.
If using the power tool at a higher voltage than the rated voltage, it will result in
abnormally fast motor revolution and may damage the unit and burn out the motor.
32. Do not run the saw while carrying it at your side.
33. Keep all screws, bolts and covers tightly in place.
Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.
34. Do not use power tools if the plastic housing or handle is cracked.
Cracks in the tool’s housing or handle can lead to electric shock. Such tools should not
be used until repaired.
Fig. 7
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10
35. Blades and accessories must be securely mounted to the tool.
Prevent potential injuries to youself or others. Blades, cutting implements and
accessories which have been mounted to the tool should be secure and tight.
36. Never use a tool which is defective or operating abnormally.
If the tool appears to be operating unusually, making strange noises, or otherwise
appears defective, stop using it immediately and arrange for repairs by a Hitachi
authorized service center.
37. Carefully handle power tools.
Should a power tool be dropped or struck against hard materials inadvertently, it may
be deformed, cracked, or damaged.
38. Do not wipe plastic parts with solvent.
Solvents such as gasoline, thinner, benzine, carbon tetrachloride, and alcohol may
damage and crack plastic parts. Do not wipe them with such solvents.
Wipe plastic parts with a soft cloth lightly dampened with soapy water and dried
thoroughly.
39. Never wear gloves made of material liable to roll up such as cotton, wool, cloth or
string, etc.
40. Appropriate Blade for C7SB2 Circular Saw
For model C7SB2, the saw blade’s diameters which can be mounted are from maximum
185 mm to minimum 180 mm.
Do not use saw blades made of high speed steel.
41. Definitions for symbols
V ............ volts
Hz .......... hertz
A ............ amperes
no.......... no load speed
.......... Class II Construction
---/min ... revolutions per minute
........ alternating current

11
DOUBLE INSULATION FOR SAFER OPERATION
To ensure safer operation of this power tool, HITACHI has adopted a double insulation
design. “Double insulation “means that two physically separated insulation systems have
been used to insulate the electrically conductive materials connected to the power supply
from the outer frame handled by the operator. Therefore, either the symbol “”or the
words “Double insulation”appear on the power tool or on the nameplate.
Although this system has no external grounding, you must still follow the normal electrical
safety precautions given in this Handling Instructions, including not using the power tool in
wet environments.
To keep the double insulation system effective, follow these precautions:
䡬Only HITACHI AUTHORIZED SERVICE CENTER should disassemble or assemble this
power tool, and only genuine HITACHI replacement parts should be installed.
䡬Clean the exterior of the power tool only with a soft cloth moistened with soapy water,
and dry thoroughly.
Never use solvents, gasoline or thinners on plastic components; otherwise the plastic
may dissolve.
SAVE THESE INSTRUCTIONS
AND
MAKE THEM AVAILABLE TO
OTHER USERS
AND
OWNERS OF THIS TOOL!

12
FUNCTIONAL DESCRIPTION
NOTE:
The information contained in this Handling Instructions is designed to assist you in the
safe operation and maintenance of the power tool.
NEVER operate, or attempt any maintenance on the tool unless you have first read and
understood all safety instructions contained in this Handling Instructions.
Some illustrations in this Handling Instructions may show details or attachments that
differ from those on your own power tool.
NAME OF PARTS
Fig. 8
Motor Single-Phase, Series Commutator Motor
Power Source * Single-Phase (220V, 230V, 240V) AC
Max. Cutting Depth 60mm
Power Input * 1710W
No Load Speed 5800/min.
Weight (without cord) 4.6 kg
SPECIFICATIONS
Handle Switch
Gear Cover
Lock Lever
Wing Bolt
Lock Spring
Lever (A)
Lower Guard
Saw Blade
Base
Lever
(Retracting
Handle)
Blade Cover
* Be sure to check the nameplate on product as it is subject to change by areas.

13
ASSEMBLY AND OPERATION
APPLICATIONS
䡬Cutting Various types of wood.
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized conforms to the power source requirements
specified on the product nameplate.
2. Power switch
Ensure that the switch is in the OFF position. If the plug is connected to a receptacle
while the switch is in the ON position, the power tool will start operating immediately
and can cause serious injury.
3. Extension cord
When the work area is far away from the power source, use an extension cord of
sufficient thickness and rated capacity. The extension cord should be kept as short as
practicable.
WARNING: Damaged cord must be replaced or repaired.
4. Check the receptacle
If the receptacle only loosely accepts the plug, the receptacle must be repaired. Contact
a licensed electrician to make appropriate repairs.
If such a faulty receptacle is used, it may cause overheating, resulting in a serious
hazard.
5. Confirming condition of the environment:
Confirm that the work site is placed under appropriate conditions conforming to
prescribed precautions.
6. Prepare a wooden workbench (Fig. 9)
Since the saw blade will extend beyond the
lower surface of the work piece, place the work
piece 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.
CAUTION:
To avoid possible accident, always ensure that
the portion of work piece remaining after
cutting is securely anchored or held in
position.
Work piece Base
Saw Blade
Fig. 9
Workbench

14
7. Check if lever (A)s are tightened.
If the lever (A) to adjust cutting depth (Fig. 10) and lever (A) to adjust angle of inclination
(Fig. 13) are loose, injury can result. Make sure that they are tightened securely.
8. Check performance of safety cover
WARNING: Make absolutely sure that the safety cover is not fixed. Also, check and
see if it can move smoothly. If the saw blade is kept exposed injury can
result.
The lower guard (refer to Fig. 8) serves to protect your body from coming into contact
with the saw blade. Make absolutely certain that the cover smoothly performs to cover
the saw blade. If the safety cover should not move smoothly, never use it without
repairing it.
In such a case, get in touch with the store where you bought the circular saw or the
HITACHI Authorized Service Center for necessary repair.
9. Eye protection
When you use the tool, make certain that you wear eye protection.
10. Check if saw blade is tightened
Refer to [mounting and dismounting the saw blade] in Page 17, and make sure that the
flange bolt is tightened securely.

15
ADJUSTSING THE SAW PRIOR TO USE
WARNING:
To avoid serious accidents, ensure the switch
is in OFF position, and disconnect the plug
from the receptacle.
1. Adjusting the cutting depth (Fig. 10)
WARNING:
If the lever (A) is loose, injury can result.
Tighten it securely after adjustment.
To adjust cutting depth, loosen the lever (A)
and, while holding the base with one hand,
move the main body up and down to obtain
the prescribed cutting depth. After adjusting
to the prescribed cutting depth, tighten the
lever (A) securely.
2. Adjusting the angle of inclination
WARNING:
If the lever (A) is loose, injury can result.
Tighten it securely after adjustment.
You can incline saw blade from 0˚to a
maximun angle of 55˚in relation to the base.
As shown in Fig. 11 by loosing the lever (A) on
the bevel scale, the saw blade may be inclined
to an angle of 45˚in relation to the base.
If you use inclination angle of over 45˚, as
shown in Fig. 12 move the lever (A) to inside,
the saw blade may be inclined to a maximum
angle of 55˚in relation to the base.
Always ensure that the lever (A) is thoroughly
tightened after making the desired adjustment.
3. Regulating the guide (Rip fence)
The cutting position can be regulated by
moving the guide to the left or right after
loosening its wing-bolt. The guide may be
mounted on either the right or left side of the
tool. (See Fig. 13)
Fig. 10
Fig. 11
Wing Bolt, Lock Spring Base
0˚–45˚
Fig. 12
Fig. 13
Guide
(Rip Fence)
Lever (A)
Tighten
Link
Base
Lever (A)
45˚–55˚
Loosen

16
CUTTING PROCEDURES
WARNING:
●Never touch the moving parts.
●Should the saw blade be stopped or make an abnormol noise during operation, turn
off the switch immediately.
●Don't remove circular saw from work piece during a cut while the saw blade is moving.
●Wear eye protection.
●Avoid cutting any material like metal, etc., that give off sparks.
CAUTION:
●Always take care in preventing the power cord from coming near the revolving saw
blade.
●Before starting to saw, ensure that the saw blade has reached full speed revolution.
1. Place the saw body (base) on the work piece,
and as in Fig. 14 align the intended line of cut
with the saw blade, using the notch at the front
of the base. This relationship of base to work
pieces should remain unchanged regardless
of the inclination of the base.
2. The switch should be turned to the ON position
before the saw blade comes into contact with
the work piece. The switch is turned ON when
the trigger is pulled by one’s finger, and is
turned OFF when the trigger is released.
3. Moving the saw straight at a constant speed
will produce optimum cutting.
[POCKET CUTTING]
WARNING:
●To avoid serious accident, ensure the switch
is OFF position, and disconnect the plug from
the receptacle before any adjustment.
●Never tie or wedge the lower guard in a raised
position.
1. Mark the desired cutting area clearly with lines
all side. (See Fig. 15)
2. Set depth adjustment according to material to
be cut.
3. Push the lever all the way back so the blade is
exposed as shown in Fig. 15.
4. Tilt saw forward and align the notch (Fig. 14)
with the pre-marked guide line.
Fig. 14
When
not
Inclined
Fig. 15
Lever
When
Inclined
45°

17
5. Release the lever. When the lower guard contacts the work piece surface, it will be in
proper position to open freely when cutting is commencend.
6. Holding the saw in position, with the blade not contacting the work piece surface, pull
the trigger.
7. After the saw has reached full speed, gradually lower rear end of the saw until its base
rests on the work surface.
8. Advance saw along the cutting line up to the corner.
9. Release trigger and allow blade to stop completely before withdrawing the blade from
the work piece.
䡩Never under any circumstances pull the saw backwards while the blade is in motion, as
kickback may result.
10. Use a jig saw or hand saw to cut the corners out clean.
11. When starting each new cut, repeat as above.
MOUNTING AND DISMOUNTING THE SAW BLADE
WARNING: To avoid serious accident ensure the switch is in the OFF position, and
disconnect the plug from the receptacle.
1. Dismounting the saw blade
(1) Set the cutting volume at maximum, and place
the Circular Saw as shown in Fig. 16.
(2) Depress the lock lever, lock the spindle, and
remove the hexagonal-flange bolt and washer
(B) with the wrench.
(3) While holding the lever to keep the lower guard
fully retracted into the blade cover, remove the
saw blade. (Fig. 17)
2. Mounting the saw blade
(1) Thoroughly remove any sawdust which has
accumulated on the spindle, bolt and washers.
(2) For mounting saw blade, the concave sides of
both washers (A) and (B) must be fitted to the
saw blade sides. Mount the saw blade on the
spindle, and finally affix washer (B) (See Fig.
18)
(3) To assure proper rotation direction of the saw
blade, the arrow direction on the saw blade
must coincide with the arrow direction on the
blade cover.
Fig. 16
Lock Lever
Wrench
Loosen
Tighten
Fig. 17
Saw Blade
Lower Guard
Blade
Cover
Lever

18
(4) Using the fingers, tighten the hexagonal bolt
retaining the saw blade as much as possible.
Then depress the lock lever, lock the spindle,
and thoroughly tighten the bolt.
(5) Confirm that the lock lever is in the original
position.
Hexagonal
Flange Bolt
Washer (A)
Washer
(B)
Saw Blade
Fig. 18

19
MAINTENANCE AND INSPECTION
WARNING: To avoid serious accident, ensure the switch is in the OFF position and
disconnect the plug from the receptacle during maintenance and
inspection.
1. Inspecting the saw blade:
Since use of a dull saw blade will degrade efficiency and cause possible motor
malfunction, sharpen or replace the saw blade as soon as abrasion is noted.
CAUTION:
If a dull saw blade is used, reactive force is increased during cutting operation. Avoid
the use of the dull saw blade without repair.
2. Check the screws
Loose screws are dangerous. Regularly inspect them and make sure they are tight.
CAUTION: Using this power tool with loosened screws is extremely dangerous.
3. Inspecting the carbon brushes (Fig. 19)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush
with a new one when it becomes worn to its
wear limit. Always keep carbon brushes clean
and ensure that they slide freely within the
brush holders.
CAUTION:
Using this circular saw with a carbon brush which is worn in excess of the wear limit will
damage the motor.
NOTE: Use HITACHI carbon brush No. 38 indicated in Fig. 19.
4. Replacing carbon brushes:
Remove the brush caps with a slotted-head
screwdriver. The carbon brushes can then be
easily removed. (Fig. 20)
5. Performance checkup and maintenance of
safety cover
Keep the safety cover in good shape for
smooth performance at all times. Be sure to
make prompt repair in case of any malfunction.
6. Adjusting the base and saw blade to
maintain perpendicularity
The angle between the base and the saw blade
has been adjusted to 90°, however should this
Wear limit
No. of carbon
brush
Fig. 19
6mm
38
17mm
Fig. 20
Brush Cap Slotted-head
Screwdriver

20
perpendicularity be lost for some reason,
adjust in the following manner.
(1) Turn the base face up (Fig. 21) and loosen the
lever (A).
(2) Apply a square to the base and the saw blade
and, turning the slotted set screw with a
slotted-head screwdriver, shift the position of
the base to produce the desired right angle.
Fig. 21
Square
Slotted Set Screw
Base