Ryobi Saw CSB123 User Guide

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  
10  
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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.  
11  
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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:  
Replacement parts can be purchased online at www.ryobitools.com or by calling  
1-800-5ꢀ5-ꢀ579. Replacement parts can also be obtained at one of our Authorized  
Service Centers.  
HOW TO LOCATE AN AUTHORIZED SERVICE CENTER:  
Authorized Service Centers can be located online at www.ryobitools.com or by calling  
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  
www.ryobitools.com  
987000-3ꢀ6  
3-17-08 (REV:00)  
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