OPERATOR’S MANUAL
7-1/4 in. CIRCULAR SAW
DOUBLE INSULATED
CSB123
Your circular saw has been engineered and manufactured to our high standard for dependability, ease of operation, and
operator safety. When properly cared for, it will give you years of rugged, trouble-free performance.
WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using
this product.
Thank you for your purchase.
SAVE THIS MANUAL FOR FUTURE REFERENCE
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GENERAL POWER TOOL SAFETy WARNINGS
AND INSTRUCTIONS
a power tool while you are tired or under the influence
of drugs, alcohol or medication. A moment of inatten-
tion while operating power tools may result in serious
personal injury.
WARNING!
Read all safety warnings and instructions. Failure to
follow the warnings and instructions may result in electric
shock, fire and/or serious injury.
Use personal protective equipment. Always wear eye
protection. Protective equipment such as dust mask,
nonskid safety shoes, hard hat, or hearing protection used
for appropriate conditions will reduce personal injuries.
Save all warnings and instructions for future
reference.
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.
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.
Do not overreach. keep proper footing and balance
at all times. This enables better control of the power tool
in unexpected situations.
keep children and bystanders away while operating a
power tool. Distractions can cause you to lose control.
Dress properly. Do not wear loose clothing or jewel-
lery. 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.
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.
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 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.
Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of elec-
tric 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 exten-
sion cord suitable for outdoor use. Use of a cord suit-
able for outdoor use reduces the risk of electric shock.
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 bind-
ing 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.
If operating a power tool in a damp location is un-
avoidable, use a residual current device (RCD) pro-
tected 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).”
PERSONAL SAFETy
Stay alert, watch what you are doing and use com-
keep cutting tools sharp and clean. Properly maintained
cutting tools with sharp cutting edges are less likely to bind
and are easier to control.
mon sense when operating a power tool. Do not use
3
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GENERAL POWER TOOL SAFETy WARNINGS
AND INSTRUCTIONS
Use the power tool, accessories and tool bits etc. in ac-
SERVICE
cordance 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.
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.
CIRCULAR SAW SAFETy WARNINGS AND INSTRUCTIONS
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.
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.
Kickbackistheresultofsawmisuseand/orincorrectoperat-
ing procedures or conditions and can be avoided by taking
proper precautions as given below:
Maintain a firm 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.
Do not reach underneath the workpiece. The guard can
not 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 piece being cut in your hands or across
your leg. 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.
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
completestop.Neverattempttoremovethesawfrom
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.
Hold 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 shock the operator.
When restarting a saw in the workpiece, centre 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.
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
eccentrically, causing loss of control.
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.
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.
Do not use dull or damaged blades. Unsharpened
or improperly set blades produce narrow kerf causing
excessive friction, blade binding and kickback.
CAUSES AND OPERATOR PREVENTION OF
kICkBACk:
Kickback is a sudden reaction to a pinched, bound, or mis-
aligned saw blade, causing an uncontrolled saw to lift up
and out of the workpiece toward the operator.
Bladedepthandbeveladjustinglockingleversmustbe
tightandsecurebeforemakingcut.Ifbladeadjustment
shifts while cutting, it may cause binding and kickback.
Use extra caution when making a “plunge cut” into
existingwallsorotherblindareas.Theprotrudingblade
may cut objects that can cause kickback.
When the blade is pinched or bound tightly by the kerf clos-
ing down, the blade stalls and the motor reaction drives the
unit rapidly back toward the operator.
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CIRCULAR SAW SAFETy WARNINGS AND INSTRUCTIONS
Checklowerguardforproperclosingbeforeeachuse.
Donotoperatesawiflowerguarddoesnotmovefreely
andcloseinstantly.Neverclamportiethelowerguard
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.
Protect your hearing. Wear hearing protection during
extended periods of operation. Following this rule will
reduce the risk of serious personal injury.
Inspect tool cords periodically and, if damaged, have
repaired at your nearest authorized service center.
Constantly stay aware of cord location. Following this
rule will reduce the risk of electric shock or fire.
Check damaged parts. Before further use of the
tool, a guard or other part that is damaged should
be carefully checked to determine that it will operate
properly and perform its intended function. Check for
alignment of moving parts, binding of moving parts,
breakage of parts, mounting, and any other conditions
that may affect its operation. A guard or other part that
is damaged should be properly repaired or replaced
by an authorized service center. Following this rule will
reduce the risk of shock, fire, or serious injury.
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.
Lower blade guard handle should be retracted manu-
ally only for special cuts, such as “plunge cuts” and
“compound cuts.” Raise lower guard by retracting
handle and as soon as blade enters the material, the
lower guard must be released. For all other sawing, the
lower guard should operate automatically.
Make sure your extension cord is in good condi-
tion. When using an extension cord, be sure to use
one heavy enough to carry the current your product
will draw. A wire gauge size (A.W.G.) of at least 14 is
recommended for an extension cord 50 feet or less
in length. A cord exceeding 100 feet is not recom-
mended. If in doubt, use the next heavier gauge. The
smaller the gauge number, the heavier the cord. An
undersized cord will cause a drop in line voltage resulting
in loss of power and overheating.
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.
ADDITIONAL SAFETy RULES
Hold power tools 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 make exposed metal parts of the tool “live”
and shock the operator.
Inspect for and remove all nails from lumber before
using this tool. Following this rule will reduce the risk of
serious personal injury.
Do not wear loose clothing or jewellery. Contain long
hair. Loose clothes, jewellery, or long hair can be drawn
into air vents.
know your power tool. Read operator’s manual care-
fully. Learn its applications and limitations, as well
as the specific potential hazards related to this tool.
Following this rule will reduce the risk of electric shock,
fire, or serious injury.
Do not use on a ladder or unstable support. Stable
footing on a solid surface enables better control of the
tool in unexpected situations.
If the power supply cord is damaged, it must be
replaced only by the manufacturer or by an authorized
service center to avoid risk.
Always wear safety glasses. Everyday eyeglasses
have only impact-resistant lenses; they are NOT safety
glasses. Following this rule will reduce the risk of serious
personal injury.
Save these instructions. Refer to them frequently and
use them to instruct others who may use this tool. If you
loan someone this tool, loan them these instructions
also.
Protect your lungs. Wear a face or dust mask if the
operation is dusty. Following this rule will reduce the
risk of serious personal injury.
5
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SyMBOLS
Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the product better and safer.
SyMBOL
NAME
DESIGNATION/EXPLANATION
V
Volts
Voltage
Current
A
Hz
W
Amperes
Hertz
Frequency (cycles per second)
Power
Watt
min
Minutes
Time
Alternating Current
Direct Current
No Load Speed
Class II Tool
Type of current
Type or a characteristic of current
Rotational speed, at no load
Double-insulated construction
Revolutions, strokes, surface speed, orbits etc., per minute
n
o
.../min
Per Minute
Wet Conditions Alert
Do not expose to rain or use in damp locations.
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Read The Operator’s Manual
Always wear safety goggles or safety glasses with side shields and,
as necessary, a full face shield when operating this product.
Eye Protection
Safety Alert
Precautions that involve your safety.
Failure to keep your hands away from the blade will result in serious
personal injury.
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
No Hands Symbol
No Hands Symbol
No Hands Symbol
Failure to keep your hands away from the blade will result in serious
personal injury.
Failure to keep your hands away from the blade will result in serious
personal injury.
To reduce the risk of injury or damage, avoid contact with any hot
surface.
Hot Surface
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SyMBOLS
The following signal words and meanings are intended to explain the levels of risk associated with this product.
SyMBOL
SIGNAL
MEANING
Indicates an imminently hazardous situation, which, if not avoided, will result
in death or serious injury.
DANGER:
Indicates a potentially hazardous situation, which, if not avoided, could result
in death or serious injury.
WARNING:
CAUTION:
CAUTION:
Indicates a potentially hazardous situation, which, if not avoided, may result in
minor or moderate injury.
(Without Safety Alert Symbol) Indicates a situation that may result in property
damage.
SERVICE
WARNING:
Servicing requires extreme care and knowledge and should
be performed only by a qualified service technician. For
service we suggest you return the product to the nearest
AUTHORIZED SERVICE CENTER for repair. When servic-
ing, use only identical replacement parts.
To avoid serious personal injury, do not attempt to use this
product until you read thoroughly and understand com-
pletely the operator’s manual. If you do not understand
the warnings and instructions in the operator’s manual,
do not use this product. Call Ryobi customer service for
assistance.
WARNING:
The operation of any power tool can result in foreign objects being thrown into your eyes, which can
result in severe eye damage. Before beginning power tool operation, always wear safety goggles or
safety glasses with side shields and, when needed, a full face shield. We recommend Wide Vision
Safety Mask for use over eyeglasses or standard safety glasses with side shields. Always use eye
protection which is marked to comply with ANSI Z87.1.
SAVE THESE INSTRUCTIONS
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ELECTRICAL
DOUBLE INSULATION
EXTENSION CORDS
Double insulation is a concept in safety in electric power
tools, which eliminates the need for the usual three-
wire grounded power cord. All exposed metal parts are
isolated from the internal metal motor components with
protecting insulation. Double insulated tools do not need
to be grounded.
When using a power tool at a considerable distance from
a power source, be sure to use an extension cord that has
the capacity to handle the current the product will draw. An
undersized cord will cause a drop in line voltage, resulting in
overheating and loss of power. Use the chart to determine
the minimum wire size required in an extension cord. Only
round jacketed cords listed by Underwriter’s Laboratories
(UL) should be used.
WARNING:
When working outdoors with a product , use an extension
cord that is designed for outside use. This type of cord is
designated with “WA” or “W” on the cord’s jacket.
The double insulated system is intended to protect
the user from shock resulting from a break in the tool’s
internal insulation. Observe all normal safety precautions
to avoid electrical shock.
Before using any extension cord, inspect it for loose or
exposed wires and cut or worn insulation.
NOTE:Servicingofaproductwithdoubleinsulationrequires
extreme care and knowledge of the system and should
be performed only by a qualified service technician. For
service, we suggest you return the product to your near-
est authorized service center for repair. Always use original
factory replacement parts when servicing.
**Ampere rating (on product data plate)
0-ꢀ.0
ꢀ.1-3.4 3.5-5.0 5.1-7.0 7.1-1ꢀ.0 1ꢀ.1-16.0
Cord Length
Wire Size (A.W.G.)
ꢀ5'
50'
16
16
16
16
16
16
16
16
14
16
14
1ꢀ
14
14
10
14
1ꢀ
—
ELECTRICAL CONNECTION
100'
This product has a precision-built electric motor. It should
be connected to a power supply that is 120 V, AC only
(normal household current), 60 Hz. Do not operate this
product on direct current (DC). A substantial voltage drop
will cause a loss of power and the motor will overheat. If
the product does not operate when plugged into an outlet,
double-check the power supply.
**Used on 12 gauge - 20 amp circuit.
NOTE: AWG = American Wire Gauge
WARNING:
Keep the extension cord clear of the working area.
Position the cord so that it will not get caught on
lumber, tools, or other obstructions while you are working
with a power tool. Failure to do so can result in serious
personal injury.
WARNING:
Check extension cords before each use. If damaged
replace immediately. Never use the product with a
damaged cord since touching the damaged area could
cause electrical shock resulting in serious injury.
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FEATURES
PRODUCT SPECIFICATIONS
Blade Diameter......................................................7-1/4 in.
Blade Arbor ..............................................................5/8 in.
Cutting Depth at 0º................................................ꢀ-3/8 in.
Cutting Depth at 45º..........................................1-13/16 in.
Cutting Depth at 51.5º...........................................1-5/8 in.
No Load Speed ....................................4,600 r/min. (RPM)
Input ................................ 1ꢀ0 V, AC only, 60 Hz, 1ꢀ Amps
Net Weight............................................................ 9.36 lbs.
UPPER BLADE
GUARD
HANDLE
BLADE
BLADE WRENCH
STORAGE AREA
LOWER
BLADE
GUARD
BLADE
BASE
WRENCH
LOWER BLADE
GUARD HANDLE
DUST
CHUTE
SPINDLE LOCK
BUTTON
SWITCH
DEPTH
ADJUSTMENT
KNOB
BEvEL
ADJUSTMENT
KNOB
MOTOR
HOUSING
BEvEL STOP
ADJUSTING
SCREW
EDGE GUIDE
LOCK KNOB
Fig. 1
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FEATURES
kNOW yOUR CIRCULAR SAW
ERGONOMIC DESIGN
The design of your circular saw provides for maintaining
proper two hand control when cutting. It has been designed
to be comfortable and easy to grasp.
See Figure 1.
The safe use of this product requires an understanding of
the information on the product and in this operator’s manual
as well as a knowledge of the project you are attempting.
Before use of this product, familiarize yourself with all
operating features and safety rules.
SPINDLE LOCk
The spindle lock allows you to secure the blade when turn-
ing the blade screw.
BLADE WRENCH STORAGE
Convenient wrench storage for quick blade changes.
NOTE: Do not run circular saw with spindle lock engaged.
SWITCH
DUST CHUTE
To direct saw dust and chips away from the operator, a dust
chute is located on the side of the upper blade guard.
Your circular saw is equipped with a pre-travel safety switch
which reduces the possibility of accidental starting. When
you depress the switch, the saw will not start until you reach
the pre-travel position. You must depress the switch fully to
activate the saw.
ASSEMBLy
UNPACkING
This product requires assembly.
WARNING:
If any parts are damaged or missing do not operate
this product until the parts are replaced. Failure to heed
this warning could result in serious personal injury.
Carefully remove the product and any accessories from
the box. Make sure that all items listed in the packing list
are included.
Inspect the product carefully to make sure no breakage
or damage occurred during shipping.
WARNING:
Do not discard the packing material until you have care-
Do not attempt to modify this product or create acces-
sories not recommended for use with this product. Any
such alteration or modification is misuse and could result
in a hazardous condition leading to possible serious
personal injury.
fully inspected and satisfactorily operated the product.
If any parts are damaged or missing, please call
1-800-5ꢀ5-ꢀ579 for assistance.
PACkING LIST
Circular Saw
7-1/4 in. Blade
Blade Wrench
WARNING:
Do not connect to power supply until assembly is
complete. Failure to comply could result in accidental
starting and possible serious personal injury.
Operator’s Manual
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ASSEMBLy
WARNING:
SPINDLE
A 7-1/4 in. blade is the maximum blade capacity of the
saw. Also, never use a blade that is too thick to allow
outer blade washer to engage with the flat on the spindle.
Larger blades will come in contact with the blade guards,
while thicker blades will prevent blade screw from se-
curing blade on spindle. Either of these situations could
result in a serious accident.
BLADE
OUTER
WASHER
(“D”
WASHER)
CAUTION:
INNER
FLANGE
BUSHING
BLADE
To prevent damage to the spindle or spindle lock, always
allow motor to come to a complete stop before engaging
spindle lock.
SCREW
SPRING
WASHER
Fig. ꢀ
OUTER WASHER
(“D” WASHER)
ATTACHING BLADE
See Figures 2 - 4.
Unplug the saw.
Depress and hold spindle lock button.
Remove blade screw by turning it counterclockwise with
the blade wrench, while keeping the spindle lock button
depressed.
Remove spring washer and outer blade washer (“D”
washer).
CUPPED SIDE OF OUTSIDE OF SPRING
SPRING WASHER
WASHER
Wipe a drop of oil onto the inner flange bushing and outer
blade washer (“D” washer) where they contact blade.
Fig. 3
WARNING:
TO
LOOSEN
SPINDLE LOCK
ARROW
ON UPPER
GUARD
If inner flange bushing has been removed, replace it
before placing blade on spindle. Failure to do so will
prevent blade from tightening properly and could result
in serious personal injury.
BUTTON
Retract the lower blade guard into the upper blade guard
using the lower blade guard handle. Make sure the lower
guard spring works properly, allowing the guard to move
freely.
Check to see that the saw teeth and arrow on the saw
blade and the arrow on the upper guard are pointing in
the same direction.
TO
NOTE: The saw teeth point upward at the front of the
saw as shown.
TIGHTEN
BLADE
SCREW
Fit the saw blade inside the lower blade guard and onto
BLADE
WRENCH
the spindle.
Fig. 4
Replace “D” washer.
Replace spring washer with cupped side against “D”
NOTE: Never use a blade that is too thick to allow the
“D” washer to engage with the flat on the spindle.
washer.
Depress spindle lock button and replace blade screw.
Tighten blade screw securely by turning it clockwise with
the blade wrench.
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ASSEMBLy
Remove spring washer and outer blade washer (“D”
REMOVING BLADE
See Figures 2 - 4.
washer).
Lift lower blade guard.
Remove blade.
Unplug the saw.
Depress and hold spindle lock button.
Remove blade screw by turning it counterclockwise with
the blade wrench, while keeping the spindle lock button
depressed.
OPERATION
WARNING:
Do not allow familiarity with this product to make you
careless. Remember that a careless fraction of a second is
sufficient to inflict serious injury.
WARNING:
Always wear safety goggles or safety glasses with side
shields when operating power tools. Failure to do so
could result in objects being thrown into your eyes
resulting in possible serious injury.
KICKBACK - BLADE SET TOO DEEP
Fig. 5
INCORRECT
SUPPORT
APPLICATIONS
You may use this product for the purposes listed below:
Cutting all types of wood products (lumber, plywood,
paneling, composition board, and hard board)
Cross cutting/rip cutting
Bevel cutting
Pocket cutting
NOTE: The use of abrasive cut-off wheels is not recom-
mended for this saw.
kICkBACk
See Figures 5 - 8.
Fig. 6
Kickback occurs when the blade stalls rapidly and the saw
is driven back towards you. Blade stalling is caused by any
action which pinches the blade in the wood.
DANGER:
Release switch immediately if blade binds or saw stalls.
Kickback could cause you to lose control of the saw. Loss
of control can lead to serious injury.
To guard against kickback, avoid dangerous practices such
as the following:
CORRECT BLADE DEPTH SETTING = LESS THAN
A FULL TOOTH OF THE BLADE TEETH SHOULD
BE vISIBLE BELOW THE WORKPIECE.
Setting blade depth incorrectly
Sawing into knots or nails in workpiece
Twisting the blade while making a cut
Fig. 7
1ꢀ
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OPERATION
Making a cut with a dull, gummed up, or improperly set
blade
CORRECT
SUPPORT
Supporting the workpiece incorrectly
Forcing a cut
Cutting warped or wet lumber
Operating the tool incorrectly or misusing the tool
To lessen the chance of kickback, follow these safety
practices:
Keep the blade at the correct depth setting. Less than a
full tooth of the blade teeth should be visible below the
workpiece.
Fig. 8
Inspect the workpiece for knots or nails before cutting.
Never saw into a knot or nail.
Make straight cuts. Always use a straight edge guide
when rip cutting. This helps prevent twisting the blade.
Use clean, sharp, and properly set blades. Never make
cuts with dull blades.
Support the workpiece properly before beginning a cut.
Use steady, even pressure when making a cut. Never
force a cut.
Do not cut warped or wet lumber.
Hold the saw firmly with both hands and keep your body
in a balanced position so as to resist the forces if kickback
should occur.
LOWER BLADE GUARD
IS IN UP POSITION
WHEN MAKING A CUT
WARNING:
Fig. 9
When using the saw, always stay alert and exercise con-
trol. Do not remove the saw from the workpiece while the
blade is moving.
DANGER:
When sawing through work, lower blade guard does not
cover blade on the underside of work. Since blade is
exposed on underside of work, keep hands and fingers
away from cutting area. Any part of your body coming in
contact with moving blade will result in serious injury.
SAW BLADES
The best of saw blades will not cut efficiently if they are not
kept clean, sharp, and properly set. Using a dull blade will
place a heavy load on the saw and increase the danger of
kickback. Keep extra blades on hand, so that sharp blades
are always available.
CAUTION:
Gum and wood pitch hardened on blades will slow the saw
down. Remove saw blade from the saw and use gum and
pitch remover, hot water, or kerosene to remove these ac-
cumulations. DO NOT USE GASOLINE.
Never use saw when guard is not operating correctly.
Check the guard for correct operation before each use.
The guard is operating correctly when it moves freely and
readily returns to the closed position. If you drop the saw,
check the lower blade guard and bumper for damage at
all depth settings before reuse.
BLADE GUARD SySTEM
See Figure 9.
The lower blade guard attached to the circular saw is there
for your protection and safety. Do not alter it for any reason.
If it becomes damaged, do not operate the saw until you
have the guard repaired or replaced. Always leave guard in
operating position when using the saw.
WARNING:
Never tie the lower blade guard in a raised position. Leav-
ing the blade exposed could lead to serious injury.
13
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OPERATION
If at any time the lower blade guard does not snap closed,
unplug the saw from the power supply. Exercise the lower
guard by moving it rapidly back and forth from the full open
position to the closed position several times. Normally this
will restore the guard to its normal operating condition. If
it does not correct a slow or sluggish closing lower guard,
do not use the saw. Take it to an authorized factory service
center for repair.
SWITCH
STARTING/STOPPING THE SAW
See Figure 10.
To start the saw: Depress the switch trigger.
Always let the blade reach full speed, then guide the saw
into the workpiece.
Fig. 10
WARNING:
INDEx POINT
The blade coming in contact with the workpiece before
it reaches full speed could cause the saw to “kickback”
towards you resulting in serious injury.
To stop the saw: Release the switch trigger.
After you release the switch trigger, allow the blade to come
to a complete stop. Do not remove the saw from the
workpiece while the blade is moving.
DEPTH OF CUT
SCALE
ADJUSTING BLADE DEPTH
See Figure 11.
Alwayskeepcorrectbladedepthsetting.Lessthanafulltooth
of the blade teeth should be visible below the workpiece.
More blade depth will increase the chance of kickback and
cause the cut to be rough. For more depth of cut accuracy,
a scale is located on the upper blade guard.
To adjust the blade depth:
DEPTH
ADJUSTMENT
KNOB
Unplug the saw.
Loosen depth adjustment knob on back of saw.
Determine the desired depth of cut.
Locate depth of cut scale on back of upper blade
guard.
BASE
Hold base flat against the workpiece and raise or lower
saw until the index point (or reference mark) on bracket
aligns with notch on blade guard.
Fig. 11
Tighten depth adjustment knob securely.
14
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OPERATION
OPERATING THE SAW
See Figures 12 - 14.
It is important to understand the correct method for operat-
ing the saw. Refer to the figures in this section to learn the
correct and incorrect ways for handling the saw.
WARNING:
To make sawing easier and safer, always maintain proper
control of the saw. Loss of control could cause an ac-
cident resulting in possible serious injury.
DANGER:
When lifting the saw from the workpiece, the blade is
exposed on the underside of the saw until the lower blade
guard closes. Make sure the lower blade guard is closed
before setting the saw down.
Fig. 1ꢀ
To make the best possible cut:
Hold the saw firmly with both hands.
Avoid placing your hand on the workpiece while making
a cut.
Support the workpiece so that the cut is always on your
right.
Support the workpiece near the cut.
Clamp the workpiece securely so that the workpiece will
not move during the cut.
Avoid placing the saw on the part of the workpiece that
will fall off when the cut is made.
Place the workpiece with the “good” side down.
Draw a guideline along the desired line of cut before
beginning your cut.
Fig. 13
Keep the cord away from the cutting area. Always place
the cord to prevent it from hanging up on the workpiece
while making a cut.
DANGER:
If the cord hangs up on the workpiece during a cut,
release the switch trigger immediately and allow the blade
to come to a complete stop. Unplug the saw and reposi-
tion the cord to prevent it from hanging up again.
DANGER:
Using a saw with a damaged cord could result in serious
injury or death. If the cord has been damaged, have it
replaced before using the saw again.
Fig. 14
15
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OPERATION
CROSS CUTTING/RIP CUTTING
BLADE
GUIDE NOTCH
TOP vIEW OF SAW
See Figures 15 - 16.
When making a cross cut or rip cut, align the line of cut
with the outer blade guide notch on the base as shown in
the figure.
Sincebladethicknessesvary,alwaysmakeatrialcutinscrap
materialalongaguidelinetodeterminehowmuch, ifany, you
must offset the guideline to produce an accurate cut.
GUIDELINE
NOTE: The distance from the line of cut to the guideline is
the amount you should offset the guide.
TO RIP CUT WITHOUT EDGE GUIDE
See Figure 16.
Fig. 15
Use a guide when making long or wide rip cuts with the
saw.
STRAIGHT EDGE
NOTE:Youmayalsouseaedgeguidetomakeripcuts.Refer
to OPTIONAL EDGE GUIDE later in this manual.
Secure the workpiece.
Clamp a straight edge to the workpiece using
C-clamps.
Saw along the straight edge to achieve a straight rip
cut.
NOTE: Do not bind the blade in the cut.
BEVEL CUTTING
See Figures 17 - 18.
To make the best possible cut, follow these helpful hints.
C-CLAMP
Align the line of cut with the inner blade guide notch on
the base when making 45° bevel cuts.
WORKPIECE
Make a trial cut in scrap material along a guideline to
determine how much you should offset the guideline on
the cutting material.
Fig. 16
BEvEL
ADJUSTMENT
KNOB
Adjust the angle of the cut to any desired setting between
zero and 51.5°. Refer to TO ADJUST BEVEL SETTING
next.
TO ADJUST BEVEL SETTING
See Figure 17.
Unplug the saw.
Loosen bevel adjustment knob.
Rotate motor housing end of saw until you reach desired
angle setting on bevel scale.
Tighten bevel adjustment knob securely.
WARNING:
Attempting a bevel cut without having the bevel
adjustment knob securely tightened can result in seri-
ous injury.
GUIDELINE
45° BLADE
GUIDE NOTCH
90° BLADE
GUIDE NOTCH
Fig. 17
16
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OPERATION
TO BEVEL CUT
See Figure 18 - 19.
Hold the saw firmly with both hands as shown.
Rest the front edge of the base on the workpiece.
Start the saw and let the blade reach full speed.
Guide the saw into the workpiece and make the cut.
Release the switch trigger and allow the blade to come
to a complete stop.
TIGHTEN
Lift the saw from the workpiece.
POCkET CUTTING
See Figure 20.
WARNING:
Always adjust bevel setting to zero before making a
pocket cut. Attempting a pocket cut at any other setting
can result in loss of control of the saw possibly causing
serious injury.
Fig. 18
MOTOR
HOUSING
Adjust the bevel setting to zero.
Set the blade to the correct blade depth setting.
Swing the lower blade guard up using the lower blade
BEvEL SCALE
guard handle.
NOTE: Always raise the lower blade guard with the handle
to avoid serious injury.
Hold the lower blade guard by the handle.
Rest the front of the base flat against the workpiece with
the rear of the handle raised so the blade does not touch
the workpiece.
Start the saw and let the blade reach full speed.
Guide the saw into the workpiece and make the cut.
BLADE GUIDE NOTCH
Fig. 19
WARNING:
Always cut in a forward direction when pocket cutting.
Cutting in the reverse direction could cause the saw to
climb up on the workpiece and back toward you.
LOWER
BLADE
GUARD
Release the trigger and allow the blade to come to a
complete stop.
Lift the saw from the workpiece.
Clear corners out with a hand saw or sabre saw.
WARNING:
Never tie the lower blade guard in a raised position. Leav-
ing the blade exposed could lead to serious injury.
LOWER BLADE
GUARD HANDLE
POCKET
CUT
Fig. ꢀ0
17
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OPERATION
0° BEVEL STOP
See Figure 21.
Thesawhasa0°bevelstopthathasbeenfactoryadjustedto
assure 0° angle of the saw blade when making 90° cuts.
To check 0° bevel stop:
Unplug the saw.
Place the saw in an upside down position on a work-
bench.
Check the squareness of the saw blade plate to the base
of the saw using a combination square.
BEvEL
ADJUSTMENT
KNOB
To adjust 0° bevel stop:
ADJUSTING
SCREW
HEx NUT
Unplug the circular saw.
Loosen bevel adjustment knob.
Loosen hex nut securing adjusting screw.
COMBINATION
SQUARE
Turn adjusting screw and adjust base until square with
saw blade.
Tighten hex nut and bevel adjustment knob securely.
WARNING:
Attempting a bevel cut without having the bevel
adjustment knob securely tightened can result in seri-
ous injury.
LENGTH OF CUT SCALE
See Figure 22.
Fig. ꢀ1
The saw is equipped with a length of cut scale on its base.
It is parallel with the saw blade and can be used to measure
the distance into the material the blade cuts.
NOTE: Six inches is the maximum length of cut that you can
measure. Also, it is accurate only when the depth of cut is
set at full maximum depth.
LENGTH OF CUT SCALE
Fig. ꢀꢀ
18
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OPERATION
OPTIONAL EDGE GUIDE
See Figure 23.
Use the optional edge guide, part no. 96986ꢀ009, when
making long or wide rip cuts with the saw.
To assemble edge guide:
Unplug the saw.
Place edge guide through holes in base as shown in the
figure.
Adjust edge guide to the width needed.
Tighten edge guide lock knob securely.
To use edge guide:
EDGE GUIDE
LOCK
KNOB
Secure the workpiece.
Position the face of the edge guide firmly against the edge
EDGE GUIDE
of workpiece.
Guide the saw along the edge to achieve a straight rip
cut.
NOTE: The guiding edge of the workpiece must be straight
for the cut to be straight. Use caution to prevent the blade
from binding in the cut.
Fig. ꢀ3
OPTIONAL DUST NOZZLE kIT
See Figure 24.
You may purchase a dust nozzle kit, part no. ꢀ00673001, for
use with the saw. The adaptor fits over the dust chute which
is located on the upper blade guard. The nozzle attaches to
the adaptor.
NOTE: If you use the nozzle, you should always connect it
to a standard vacuum hose.
ADAPTOR
SCREW
To attach dust nozzle:
Unplug the saw.
HOLE
Lift lower blade guard.
Orient adaptor to fit into the dust chute opening on upper
blade guard.
Secure adaptor with screw provided.
Align hole in nozzle with raised lip on adaptor and snap
DUST
CHUTE
into place when using a vacuum hose.
NOZZLE
RAISED
LIP
Fig. ꢀ4
19
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MAINTENANCE
Electric tools used on fiberglass material, wallboard, spack-
WARNING:
ling compounds, or plaster are subject to accelerated wear
and possible premature failure because the fiberglass chips
and grindings are highly abrasive to bearings, brushes,
commutators, etc. Consequently, we do not recommend
using this product for extended work on these types
of materials. However, if you do work with any of these
materials, it is extremely important to clean the product
using compressed air.
When servicing, use only identical replacement parts.
Use of any other parts may create a hazard or cause
product damage.
WARNING:
Always wear safety goggles or safety glasses with side
shields during power tool operation or when blowing
dust. If operation is dusty, also wear a dust mask.
LUBRICATION
All of the bearings in this product are lubricated with a
sufficient amount of high grade lubricant for the life of the
unitundernormaloperatingconditions.Therefore,nofurther
lubrication is required.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercial solvents and may be damaged by their use. Use
clean cloths to remove dirt, dust, oil, grease, etc.
POWER SUPPLy CORD REPLACEMENT
If replacement of the power supply cord is necessary, this
has to be done by the manufacturer or his agent in order to
avoid a safety hazard.
WARNING:
Do not at any time let brake fluids, gasoline, petroleum-
based products, penetrating oils, etc., come in contact
with plastic parts. Chemicals can damage, weaken or
destroy plastic which may result in serious personal
injury.
ACCESSORIES
To order these accessories, call 1-800-5ꢀ5-ꢀ579.
Edge Guide......................................................................................................................................................96986ꢀ009
Dust Nozzle Kit................................................................................................................................................ꢀ00673001
WARNING:
Current attachments and accessories available for use with this product are listed above. Do not use any attachments or
accessories not recommended by the manufacturer of this product. The use of attachments or accessories not recom-
mended can result in serious personal injury.
ꢀ0
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NOTES
ꢀ1
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OPERATOR’S MANUAL
7-1/4 in. CIRCULAR SAW
DOUBLE INSULATED
CSB123
WARNING:
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains
chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these
chemicals are:
•lead from lead-based paints,
•crystalline silica from bricks and cement and other masonry products, and
•arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you do this type of work. To reduce your
exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such
as those dust masks that are specially designed to filter out microscopic particles.
• PARTS AND SERVICE
Prior to requesting service or purchasing replacement parts, please obtain your model
and serial number from the product data plate.
CSB1ꢀ3
• MODEL NUMBER
• SERIAL NUMBER
• HOW TO OBTAIN REPLACEMENT PARTS:
1-800-5ꢀ5-ꢀ579. Replacement parts can also be obtained at one of our Authorized
Service Centers.
• HOW TO LOCATE AN AUTHORIZED SERVICE CENTER:
1-800-5ꢀ5-ꢀ579.
• HOW TO OBTAIN CUSTOMER OR TECHNICAL SUPPORT:
To obtain Customer or Technical Support please contact us at 1-800-5ꢀ5-ꢀ579.
RYOBI® is a registered trademark of Ryobi Limited used under license.
ONE WORLD TECHNOLOGIES, INC.
14ꢀ8 Pearman Dairy Road, Anderson, SC ꢀ96ꢀ5
Phone 1-800-5ꢀ5-ꢀ579
987000-3ꢀ6
3-17-08 (REV:00)
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