Ryobi RY10521B User manual

OPERATOR’S MANUAL
MANUEL D’UTILISATION
MANUAL DEL OPERADOR
RY10521B / 20 in. 46cc Chain Saw
Scie à chaîne de 46 cc de 508 mm (20 po)
Motosierra de 508 mm (20 pulg.), 46 cc
RY10519B /18 in. 46cc Chain Saw
Scie à chaîne de 46 cc de 457 mm (18 po)
Motosierra de 457 mm (18 pulg.), 46 cc
FAMILY: *HCPS.0464AD
FAMILLE : *HCPS.0464AD
FAMILIA: *HCPS.0464AD
NOTICE AVIS AVISO
Do not use E15 or E85 fuel (or fuel containing greater than 10% ethanol) in this product. It is
a violation of federal law and will damage the unit and void your warranty.
Ne pas utiliser d’essence E15 ou E85 (ou un carburant contenant plus de 10 % d’éthanol) dans
ce produit. Une telle utilisation représente une violation de la loi fédérale et endommagera l’appareil et annulera la garantie.
No utilice combustibles E15 o E85 (ni combustibles que contengan más de 10 % de etanol) con este producto. Esto constituye
una violación a la ley federal, dañará la unidad y anulará la garantía.
WARNING: To reduce the
risk of injury, the user must read and
understand the operator’s manual
before using this product.
TABLE OF CONTENTS
General Safety Rules ...................... 2-3
Specific Safety Rules...................... 3-4
Symbols .......................................... 5-6
Glossary of Terms...............................7
Features .......................................... 8-9
Assembly ..........................................10
Operation .................................... 10-23
Maintenance ............................... 24-36
Bar and Chain Combinations............37
Troubleshooting................................38
Parts Ordering/Service........ Back Page
AVERTISSEMENT : Pour
réduire les risques de blessures,
l’utilisateur doit lire et veiller à bien
comprendrelemanueld’utilisationavant
d’employer ce produit.
TABLE DES MATIÈRES
Règles de sécurité générales.......... 2-3
Règles de sécurité particulières...... 3-4
Symboles ........................................ 5-6
Glossaire .............................................7
Caractéristiques.............................. 8-9
Assemblage ......................................10
Utilisation .................................... 10-23
Entretien...................................... 24-36
Combinaisons de guide et chaîne ....37
Dépannage........................................38
Commande de pièces/
réparation.......................... Páge arrière
ADVERTENCIA: Parareducir
elriesgodelesiones,elusuariodebeleer
y comprender el manual del operador
antes de usar este producto.
ÍNDICE DE CONTENIDO
Reglas de seguridad generales ...... 2-3
Reglas de seguridad específicas.... 3-4
Símbolos ......................................... 5-6
Glosario de términos...........................7
Características ................................ 8-9
Armado .............................................10
Funcionamiento .......................... 10-23
Mantenimiento ............................ 24-36
Combinaciones de barra y cadena...37
Corrección de problemas .................38
Pedidos de piezas/
servicio........................... Pág. posterior
SAVE THIS MANUAL FOR
FUTURE REFERENCE CONSERVER CE MANUEL POUR FUTURE RÉFÉRENCE GUARDE ESTE MANUAL PARA FUTURAS CONSULTAS

Page 2 — English
WARNING:
Read and understand all instructions. Failure
to follow all instructions listed below, may result
in electric shock, fire and/or serious personal
injury.
READ ALL INSTRUCTIONS
Know your tool. Read the operator’s manual
carefully. Learn the saw’s applications and
limitations as well as the specific potential
hazards related to this tool.
■Kickback may occur when the nose or tip of
the guide bar touches an object, or when the
wood closes in and pinches the saw chain in
the cut. Tip contact in some cases may cause a
lightning-fast reverse reaction, kicking the guide
bar up and back toward the operator. Pinching
the saw chain along the top of the guide bar
may push the guide bar rapidly back toward the
operator. Either of these reactions may cause
you to lose control of the saw, which could result
in serious personal injury. Do not rely exclusively
upon the safety devices built into the saw. As a
chain saw user, you should take several steps
to keep your cutting jobs free from accident or
injury.
• With a basic understanding of kickback,
you can reduce or eliminate the element
of surprise. Sudden surprise contributes to
accidents.
• Keep a good firm grip on the saw with both
hands when the engine is running. Place
your right hand on the rear handle and
your left hand on the front handle with your
thumbs and fingers encircling the chain saw
handles. A firm grip together with a stiff left
arm will help you maintain control of the saw
if kickback occurs.
• Make sure that the area in which you are
cutting is free from obstructions. DO NOT
let the nose of the guide bar contact a log,
branch, fence, or any other obstruction that
could be hit while you are operating the saw.
• Cut at high engine speeds. Always cut
with the engine running at full speed. Fully
squeeze the throttle trigger and maintain a
steady cutting speed.
• Do not overreach or cut above chest height.
• Follow the manufacturer’s sharpening and
maintenance instructions for the saw chain.
• Only use replacement bars and chains
specified by the manufacturer or the
equivalent.
Do not operate a chain saw with one
hand. Serious injury to the operator, helpers,
bystanders, or any combination of these
persons may result from one-handed operation.
A chain saw is intended for two-handed use.
Do not operate a chain saw when you are
fatigued. Fatigue causes carelessness. Be more
cautious before rest periods and towards the
end of your shift. Never operate a chain saw
when you are tired or under the influence of
medication, drugs, or alcohol.
Stay alert - Watch what you are doing and use
common sense when operating a chain saw. A
moment of inattention while operating the chain
saw may result in death or serious personal
injury.
Chain saw work can be strenuous. If you have
a medical condition that may be aggravated or
a disability that may prevent you from safely
operating and controlling the chain saw, check
with your doctor before using the chain saw.
Use safety footwear. Wear snug-fitting
clothing, protective gloves, and eye, hearing,
and head protection devices.
Heavy protective clothing may increase
operator fatigue, which could lead to
heat stroke. During weather that is hot and
humid, heavy work should be scheduled for
early morning or late afternoon hours when
temperatures are cooler.
Do not stand on any unstable surface while
using the chain saw, that includes ladders,
scaffolds, trees, etc.
Use caution when handling fuel. Move the
chain saw at least 30 feet from the fueling point
before starting the engine.
Do not allow other persons to be near the
chain saw when starting or cutting with the
chain saw. Keep bystanders and animals out
of the work area.
GENERAL SAFETY RULES

Page 3 — English
Do not start cutting until you have a clear
work area, secure footing, and a planned
retreat path from the falling tree.
Keep all parts of your body away from the
saw chain when the engine is running.
Always carry the chain saw with the engine
stopped and the chain brake engaged, the
guide bar and saw chain to the rear, and the
muffler away from your body. When transporting
the chain saw, use the appropriate guide bar
scabbard.
Do not operate a chain saw that is damaged,
improperly adjusted, or not completely and
securely assembled. Be sure that the saw chain
stops moving when the throttle control trigger
is released.
■Shut off the engine before setting the chain
saw down. Do not leave the engine running
unattended. As an additional safety precaution,
apply the chain brake prior to setting down the
saw.
■Use extreme caution when cutting small-size
brush and saplings because slender material
may catch the saw chain and be whipped
toward you or pull you off balance.
■When cutting a limb that is under tension,
be alert for springback so that you will not be
struck when the tension in the wood fibers is
released.
■Keep the handles dry, clean, and free of oil or
fuel mixture.
Beware of carbon monoxide poisoning.
Operate the chain saw only in well-ventilated
areas.
■Do not operate a chain saw in a tree unless
you have been specifically trained to do so.
Do not cut from a ladder, rooftop, or other
unstable support; this is extremely dangerous.
All chain saw service, other than the items listed
in the instruction manual and all maintenance,
should be performed by competent chain saw
service personnel. (For example, if improper
tools are used to remove the flywheel or if an
improper tool is used to hold the flywheel in
order to remove the clutch, structural damage
to the flywheel could occur and subsequently
could cause the flywheel to burst.)
Always have a fire extinguisher available
when using chain saw.
Use only the replacement guide bars and low
kickback chains specified for the saw.
■Do not adapt the powerhead to a bow guide
or use it to power any attachments or devices
not listed for the saw.
■The gas powered saw is classified by CSA
262.1-15 as a Class 1C saw. It is intended for
infrequent use by homeowners, cottagers, and
campers, and for such general applications as
clearing, pruning, cutting firewood, etc. It is not
intended for prolonged use. Prolonged periods
of operation can cause circulatory problems in
the user’s hands due to vibration. For such use,
it may be appropriate to use a saw having an
anti-vibration feature.
Save these instructions. Refer to them
frequently and use to instruct other users. If you
loan someone this product, loan them these
instructions also.
GENERAL SAFETY RULES
SPECIFIC SAFETY RULES
WARNING:
The warnings, labels, and instructions found
in this section of the operator’s manual are for
your safety. Failure to follow all instructions may
result in serious personal injury.
Do not cut vines and/or small underbrush (a
diameter of less than 3 in.).
Muffler surfaces are very hot during and after
operation of the chain saw; keep all body parts
away from the muffler. Serious burns may occur
if contact is made with the muffler.
■Always hold the chain saw with both hands
when the engine is running. Use a firm grip
with thumbs and fingers encircling the chain
saw handles.

Page 4 — English
and securely assembled. Be sure that the saw
chain stops moving when the throttle control
trigger is released. If the saw chain moves at
idle speed, the carburetor may need adjusting.
Refer to Adjusting the Carburetor in the
Maintenance section of this manual. If the saw
chain still moves at idle speed after adjustment
has been made, contact an authorized service
center for adjustment and discontinue use until
the repair is made.
REFUELING (DO NOT SMOKE!)
■To reduce the risk of fire and burn injury,
handle fuel with care. It is highly flammable.
■Mix and store fuel in a container approved for
gasoline.
■Mix fuel outdoors where there are no sparks
or flames.
■Select bare ground, stop the engine, and
allow it to cool before refueling.
■Loosen the fuel cap slowly to release pressure
and to keep fuel from escaping around the cap.
■Tighten the fuel cap securely after refueling.
■Wipe spilled fuel from the unit. Move 30 feet
away from refueling site before starting engine.
Never attempt to burn off spilled fuel under
any circumstances.
KICKBACK
Kickback is a dangerous reaction that can
lead to serious injury. Do not rely only on the
safety devices provided with the saw. As a
chain saw user, you must take special safety
precautions to help keep your cutting jobs free
from accident or injury. See the General Safety
Rules and Operation sections of this manual
for added information on kickback and how to
avoid serious personal injury.
■Never let anyone use the chain saw who
has not received adequate instructions in its
proper use. This applies to rentals as well as
privately owned saws.
■Before you start the engine,make sure the
saw chain is not contacting any object.
Wear snug-fitting clothing. Always wear
heavy, long pants, boots, and gloves. Do not
wear jewelry, short pants, sandals, or go bare-
foot. Do not wear loose fitting clothing, which
could be drawn into the engine or catch the
chain or underbrush. Wear overalls, jeans, or
chaps made of cut-resistant material or ones
that contain cut-resistant inserts. Secure hair
so that it is above shoulder level.
■Wear non-slip safety footwear and heavy-
duty gloves to improve your grip and to protect
your hands.
■Wear eye protection with side shields which
is marked to comply with ANSI Z87.1, as well
as hearing and head protection, when operat-
ing this equipment.
Keep bystanders and animals out of the work
area. Do not allow other persons to be nearby
during starting or cutting with the chain saw.
NOTE: The size of the work area depends on the
job being performed as well as the size tree or
workpiece involved. For example, felling a tree
requires a larger work area than making other
cuts (i.e., bucking cuts, etc.).
Keep SAFE-T-TIP®anti-kickback nose guard
properly mounted on the guide bar to prevent
rotational kickback.
Follow the sharpening and maintenance
instructions for the saw chain.
Never operate a chain saw that is damaged,
improperly adjusted, or is not completely
SPECIFIC SAFETY RULES
SAVE THESE INSTRUCTIONS

Page 5 — English
The following signal words and meanings are intended to explain the levels of risk associated with
this product.
SYMBOL SIGNAL MEANING
DANGER: Indicates a hazardous situation, which, if not avoided, will result
in death or serious injury.
WARNING: Indicates a hazardous situation, which, if not avoided, could
result in death or serious injury.
CAUTION: Indicates a hazardous situation, which, if not avoided, may result
in minor or moderate injury.
NOTICE:
(Without Safety Alert Symbol) Indicates information considered
important, but not related to a potential injury (e.g. messages
relating to property damage).
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
Safety Alert Indicates a potential personal injury hazard.
Read Operator’s Manual To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Wear Eye, Hearing, and
Head Protection
Wear eye protection with side shields marked to comply
with ANSI Z87.1 as well as hearing and head protection
when operating this equipment.
Keep Tool Away from
Electrical Lines/Keep
Bystanders Away
DANGER! Risk of electrocution! Keep tool 50 feet away
from electrical lines. Keep all bystanders at least 50 ft.
away or twice the height of the largest trees in the felling
area when felling.
SAFE-T-TIP®Nose Guard The SAFE-T-TIP®nose guard on the guide bar helps
prevent kickback.
No Smoking No smoking, sparks, or open flame.
Operate With Two Hands Hold and operate the saw properly with both hands.
One Handed Do not operate the saw using only one hand.

Page 6 — English
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
Carbon Monoxide Engines produce carbon monoxide which is an odorless,
deadly poison. Do not operate in an enclosed area.
Bar Nose Contact Avoid bar nose contact.
Hot Surface To reduce the risk of injury or damage, avoid contact with
any hot surface.
Kickback DANGER! BEWARE OF KICKBACK.
Wear Gloves Wear non-slip, heavy-duty protective gloves when
handling the chain saw.
Wear Safety Footwear Wear non-slip safety footwear when using this
equipment.
Gasoline and
Lubricant
Use unleaded gasoline intended for motor vehicle use
with an octane rating of 87 [(R + M)/2] or higher. This
product is powered by a 2-cycle engine and requires
pre-mixing gasoline and 2-cycle lubricant.

Page 7 — English
Bucking
The process of cross cutting a felled tree or log
into lengths.
Chain Brake
A device used to stop the saw chain.
Chain Saw Power Head
A chain saw without the saw chain and guide bar.
Clutch
A mechanism for connecting and disconnecting
a driven member to and from a rotating source of
power.
Drive Sprocket or Sprocket
The toothed part that drives the saw chain.
Felling
The process of cutting down a tree.
Felling Back Cut
The final cut in a tree felling operation made on
the opposite side of the tree from the notching
undercut.
Front Hand Guard
A structural barrier between the front handle of
a chain saw and the guide bar, typically located
close to the hand position on the front handle, and
sometimes employed as an activating lever for a
chain brake.
Front Handle
The support handle located at or toward the front
of the chain saw. This handle is for the left hand.
Guide Bar
A solid railed structure that supports and guides
the saw chain.
Kickback
The backward or upward motion, or both, of the
guide bar occurring when the saw chain near the
nose of the top area of the guide bar contacts any
object such as a log or branch, or when the wood
closes in and pinches the saw chain in the cut.
Kickback (Pinch)
The rapid pushback of the saw which can occur
when the wood closes in and pinches the moving
saw chain in the cut along the top of the guide bar.
Kickback (Rotational)
The rapid upward and backward motion of the
saw which can occur when the moving saw chain
near the upper portion of the tip of the guide bar
contacts an object, such as a log or branch.
Low-Kickback Chain
A chain that complies with the kickback perfor-
mance requirements of ANSI B175.1 when tested
on a representative sample of chain saws.
Normal Cutting Position
Thosepositionsassumedinperformingthebucking
and felling cuts.
Notching Undercut
A notch cut in a tree that directs the tree’s fall.
Rear Handle
The support handle located at or toward the rear
of the saw. It normally contains the throttle. This
handle is for the right hand.
Reduced Kickback Guide Bar
A guide bar which has been demonstrated to
reduce kickback significantly.
Replacement Saw Chain
A chain that complies with the kickback perfor-
mance requirements of ANSI B175.1 when tested
with specific chain saws. It may not meet the ANSI
performance requirements when used with other
saws.
SAFE-T-TIP®Nose Guard
An attachment that may be provided on the end
of the guide bar to prevent the chain at the end of
the guide bar from contacting the wood.
Saw Chain
A loop of chain having cutting teeth that cut the
wood, and that is driven by the motor and is sup-
ported by the guide bar.
Springpole
A small tree (sapling) or limb that is bent or trapped
under tension. It may “spring back” rapidly when
cut, causing a dangerous situation.
GLOSSARY OF TERMS

Page 8 — English
PRODUCT SPECIFICATIONS
Bar length:
RY10521B............................................... 20 in.
RY10519B............................................... 18 in.
Chain pitch ............................................. .325 in.
Chain gauge ........................................... .050 in.
Chain type ............................................ Standard
Drive sprocket ......................................... 7-tooth
Engine displacement................................... 46cc
Idle engine speed ........2,600-3,400 r/min. (RPM)
Fuel tank capacity .................................. 19.4 oz.
Chain lubricant tank capacity................. 11.8 oz.
Fig. 1a
FRONT HAND GUARD/
CHAIN BRAKE
FRONT
HANDLE
CYLINDER
COVER
TRIGGER
RELEASE
CHAIN OIL
CAP
SAFE-T-TIP®
PRIMER
BULB
CHOKE
LEVER
FEATURES
BAR
MOUNTING
NUTS
MUFFLER
STARTER GRIP
AND ROPE
THROTTLE
TRIGGER
REAR
HANDLE
CHAIN TENSIONING
SCREW
CLUTCH COVER
FELLING
DIRECTION
LINE

Page 9 — English
KNOW YOUR CHAIN SAW
See Figures 1a - 1b.
The safe use of this product requires an under-
standing 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.
CHOKE LEVER
The choke lever opens and closes the choke valve
in the carburetor. Positions available include FULL
CHOKE and RUN.
FELLING DIRECTION LINE
The felling direction line helps you keep the saw
aligned properly during tree felling.
FRONT HAND GUARD/CHAIN BRAKE
The chain brake is designed to quickly stop the
chain from rotating. When the front hand guard/
chain brake is pushed toward the bar, the chain
should stop immediately. The chain brake does
not prevent kickback.
GUIDE BAR
The factory-equipped guide bar has a small radius
tipthatoffersasomewhatlower kickback potential.
LOW KICKBACK SAW CHAIN
The low kickback saw chain helps minimize the
force of a kickback reaction by preventing the
cutters from digging in too deeply at the kickback
zone.
PRIMER BULB
The primer bulb pumps fuel from the fuel tank to
the carburetor.
SAFE-T-TIP®ANTI-KICKBACK NOSE
GUARD
The SAFE-T-TIP®Anti-Kickback Nose Guard is
an attachment provided on the end of the guide
bar to prevent the chain on the end of the guide
bar from contacting the wood.
THROTTLE TRIGGER
The throttle trigger is used for controlling chain
rotation.
Fig. 1b
REAR
HANDLE
THROTTLE
TRIGGER
FUEL CAP
STARTER/FAN
HOUSING
FEATURES
AIR FILTER
COVER
STARTER GRIP
AND ROPE
ON/STOP
SWITCH
FELLING
DIRECTION
LINE

Page 10 — English
DANGER:
Never cut near power lines, electric cords, or
other electric sources. If bar and chain jams
on any electrical cord or line, DO NOT TOUCH
THE BAR OR CHAIN! THEY CAN BECOME
ELECTRICALLY LIVE AND VERY DANGEROUS.
Continue to hold the chain saw by the insulated
rear handle or lay it down and away from you in
a safe manner. Disconnect the electrical service
to the damaged line or cord before attempting
to free the bar and chain from the line or cord.
Contact with the bar, chain, other conductive
parts of the chain saw, or live electric cords or
lines will result in death by electrocution, elec-
tric shock, or serious personal injury.
PACKING LIST (continued)
Combination Wrench
2-Cycle Engine Lubricant
Case
Operator’s Manual
WARNING:
If any parts are damaged or missing do not
operate this product until the parts are replaced.
Use of this product with damaged or missing
parts could result in serious personal injury.
WARNING:
Do not attempt to modify this product or create
accessories not recommended for use with this
product. Any such alteration or modification is
misuse and could result in a hazardous condi-
tion leading to possible serious personal injury.
NOTE: Thechainsawhasbeenfullyfactory tested.
It is normal to find some slight lubricant residue
on the saw. Read and remove all hang tags and
store with the Operator’s Manual.
UNPACKING
This product has been shipped completely
assembled.
Carefully remove the product and any acces-
sories from the box. Make sure that all items
listed in the packing list are included.
WARNING:
Do not use this product if it is not completely
assembled or if any parts appear to be missing
or damaged. Use of a product that is not prop-
erly and completely assembled could result in
serious personal injury.
Inspect the product carefully to make sure no
breakage or damage occurred during shipping.
Do not discard the packing material until you
have carefully inspected and satisfactorily oper-
ated the product.
If any parts are damaged or missing, please call
1-800-860-4050 for assistance.
PACKING LIST
Chain Saw
Scabbard
ASSEMBLY
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 seri-
ous injury.
WARNING:
Muffler surfaces are very hot during and after
operation of the chain saw; keep all body parts
away from the muffler. Serious burns could
occur if contact is made with the muffler.

Page 11 — English
WARNING:
Always wear eye protection with side shields
marked to comply with ANSI Z87.1, along with
hearing and head protection. Failure to do so
could result in objects being thrown into your
eyes and other possible serious injuries.
WARNING:
Do not use any attachments or accessories
not recommended by the manufacturer of this
product. The use of attachments or accessories
not recommended can result in serious personal
injury.
WARNING:
Operation of this equipment may create sparks
that can start fires around dry vegetation.
A spark arrestor may be required. The opera-
tor should contact local fire agencies for
laws or regulations relating to fire prevention
requirements.
WARNING:
Never fell a tree or cut a log or limb that has a
diameter greater than the length of the guide
bar. Only properly trained professionals should
perform these cuts. Performing these types of
cuts can cause an accident and result in death
or serious personal injury.
NOTICE:
Before each use, inspect the entire product
for damaged, missing, or loose parts such as
screws, nuts, bolts, caps, etc. Tighten securely
all fasteners and caps and do not operate this
product until all missing or damaged parts are
replaced. Please contact customer service or a
qualified service center for assistance.
APPLICATIONS
You may use this product for the purposes listed
below:
Basic limbing, felling, and bucking
WARNING:
Always shut off engine before fueling. Never add
fuel to a machine with a running or hot engine.
Move at least 30 ft. from refueling site before
starting the engine. DO NOT SMOKE! Stay away
from open flames or sparks. Failure to heed this
warning could result in serious personal injury.
FUEL AND REFUELING
HANDLING THE FUEL SAFELY
WARNING:
Check for fuel leaks. A leaking fuel cap is a fire
hazard and must be replaced immediately. If
you find any leaks, correct the problem before
using the product. Failure to do so could result
in a fire that could cause serious personal injury.
Always handle fuel with care; it is highly flam-
mable.
Always refuel outdoors and do not inhale fuel
vapors.
Do not let gasoline or lubricant come in contact
with skin.
Keep gasoline and lubricant away from the eyes.
If gasoline or lubricant comes in contact with
the eyes, wash them immediately with clean
water. If irritation is still present, see a doctor
immediately.
Clean up spilled fuel immediately.
Referto Refueling intheSpecific SafetyRulessec-
tionof this manual for additionalsafety information.
ETHANOL-BLENDED FUELS
NOTICE:
Do not use E15 or E85 fuel (or fuel containing
greater than 10% ethanol) in this product. It
is a violation of federal law and will damage
the unit and void your warranty.
NOTE: To improve performance when using
ethanol-blended fuels, we recommend the use of
Ethanol Shield 2-cycle lubricant.
OPERATION

Page 12 — English
MIXING THE FUEL
This product is powered by a 2-cycle engine and
requirespre-mixinggasolineand 2-cycle lubricant.
Pre-mix unleaded gasoline and 2-cycle engine
lubricant in a clean container approved for gaso-
line. DO NOT mix quantities larger than usable in
a 30-day period.
Recommended fuel: This engine is certified to
operate on unleaded gasoline intended for auto-
motive use.
NOTE:We recommend youuse Homelite premium
2-cycle lubricant, PowerCare 2-cycle lubricant
(6.4 oz. or 16 oz.), or an equivalent high-quality
synthetic 2-cycle lubricant in this product. Mix at
2.6 oz. per gallon (US).
Donotuseautomotivelubricantor2-cycleoutboard
lubricant.
HIGH QUALITY 2-CYCLE
ENGINE LUBRICANT
GASOLINE LUBRICANT
1.0 gal. (US) (3.8 liter) 2.6 oz. (76 ml)
2.5 gal. (US) (9.5 liter) 6.4 oz. (189 ml)
FILLING THE FUEL TANK
See Figure 2.
WARNING:
Gasoline and its vapors are highly flammable
and explosive. To prevent serious personal
injury and property damage, handle it with care.
Keep away from ignition sources and open
flames, handle outdoors only, do not smoke,
and wipe up spills immediately.
Clean the surface around the fuel cap to prevent
contamination.
Loosen the fuel cap slowly, by turning counter-
clockwise.
Carefully pour the fuel mixture into the tank.
Avoid spillage.
Priortoreplacingthefuelcap,cleanandinspectthe
o-ring.
Immediately replace the fuel cap and hand
tighten, by turning clockwise. Wipe up any fuel
spillage.
OPERATION
Fig. 2
Fig. 3
Move at least 30 ft. away from refueling area
before starting the product.
NOTE: It is normal for the engine to emit smoke
during and after the first use.
WARNING:
Always shut off engine before fueling. Never
remove fuel cap or add fuel to a machine with
a running or hot engine. Make sure unit is sit-
ting on a flat, level surface and only add fuel
outdoors. If the engine is hot, allow to cool for
at least five minutes before adding fuel. Imme-
diately replace fuel cap after fueling and tighten
securely. Move at least 30 ft. from refueling site
before starting the engine. Do not smoke and
stay away from open flames and sparks. Failure
to follow these instructions could result in a fire
and cause serious personal injury.

Page 13 — English
OPERATION
ADDING BAR AND CHAIN LUBRICANT
See Figure 3.
Use RYOBI Bar and Chain Lubricant. It is designed
for chains and chain oilers, and is formulated to
performoverawidetemperaturerangewithnodilu-
tion required. Chain saw should use approximately
one tank of lubricant per tank of fuel.
NOTE: Do not use dirty, used, or otherwise con-
taminated lubricants. Damage may occur to the
oil pump, bar, or chain.
Carefully pour the bar and chain lubricant into
the oil tank.
Fill the oil tank every time you fuel the engine.
OPERATING THE CHAIN BRAKE
See Figures 4 - 5.
Check the operating condition of the chain brake
prior to each use.
Engage the chain brake by rotating your left
hand around the front handle, allowing the back
of your hand to push the chain brake lever/hand
guard toward the bar while the chain is rotating
rapidly. Be sure to maintain both hands on the
saw handles at all times.
Reset the chain brake back into the RUN posi-
tion by grasping the top of the chain brake lever/
hand guard and pulling toward the front handle
until you hear a click.
WARNING:
If the chain brake does not stop the chain
immediately, or if the chain brake will not stay
in the run position without assistance, take the
saw to an authorized service center for repair
prior to use.
NOTICE:
Before each use, check to make sure that the
chain is properly tensioned. A cold chain is cor-
rectly tensioned when there is no slack on the
underside of the guide bar, the chain is snug,
and it can be turned by hand without binding.
During normal saw operation, the temperature
of the chain increases. The drive links of a cor-
rectly tensioned warm chain will hang approxi-
mately .050 in. out of the bar groove.
See the Adjusting the Chain Tension instruc-
tions in the Maintenance section of this manual
to properly adjust the chain tension.
Fig. 4
Fig. 5
BRAKE
POSITION
Fig. 6
RUN
POSITION
STARTER GRIP
AND ROPE
STARTING THE ENGINE
See Figures 6 - 11.
Starting the product differs depending on whether
the engine is cold or warm.
WARNING:
Keep your body to the left of the chain line.
Never straddle the saw or chain, or lean over
past the chain line.
Place the chain saw on level ground and ensure
that no objects or obstructions are in the imme-
diate vicinity that could come in contact with the
bar and chain.

Page 14 — English
Hold the front handle firmly with your left hand
and put your right foot onto the base of the rear
handle.
To start a cold engine:
Set the on/stop switch to the RUN ( I ) position.
Make sure the chain brake is in the run position
by pulling back on the lever/hand guard.
Fully press and release the primer bulb 7 times.
Pull choke lever all the way out to FULL CHOKE
position.
When the temperature is above 50°F, pull the
starter grip and rope until the engine attempts
to start, but no more than 3 times. When the
temperature is below 50°F, pull the starter grip
and rope until the engine attempts to start, but
no more than 5 times.
Push choke lever to RUN position.
Pull starter grip and rope until engine runs.
NOTE: Allow the saw to run in this position
15-30 seconds, depending upon the tempera-
ture.
Depress the trigger release and squeeze and
release the throttle trigger to return the engine to
idle after a total run time of at least 30 seconds.
NOTICE:
Failure to release partial throttle when chain
brake lever is in the brake position will result in
serious damage to the unit. Never squeeze and
hold the throttle trigger while the chain brake is
in the brake position.
RUN
POSITION
Fig. 9
Fig. 10
Fig. 8
CHOKE
LEVER
PRIMER BULB
Fig. 11
THROTTLE
TRIGGER
TRIGGER
RELEASE
OPERATION
Fig. 7
ON/STOP
SWITCH
SWITCH IN THE
RUN POSITION

Page 15 — English
To Start a Warm Engine:
Set the on/stop switch to the RUN ( I ) position.
Make sure the chain brake is in the run position
by pulling back on the lever/hand guard.
Pull choke lever out to FULL CHOKE position
then push immediately back to RUN position to
set fast idle.
Pull starter grip and rope until engine runs, but
no more than 5 times. If engine does not start
after 5 pulls, use cold engine starting procedure.
Squeeze and release the throttle trigger to return
the engine to idle.
STOPPING THE ENGINE
See Figures 12 - 13.
Releasethe throttletrigger and letthe engine return
to idle. To stop the engine, move theon/stop switch
to the STOP ( ) position. Do not put the chain
saw on the ground when the chain is still moving.
For additional safety, set the chain brake when the
saw is not in use.
Inthe event thatthe on/stop switch willnot stop the
saw, pull the choke lever out to the fully extended
position (FULL CHOKE) and engage chain brake
to stop the engine. If the on/stop switch will not
stop the saw when set to the STOP position, have
the on/stop switch repaired before using the chain
saw again to prevent unsafe conditions or serious
injury.
NOTE: When you are finished using the saw,
always relieve tank pressure by loosening, then
retightening, the chain oil and fuel caps. Allow the
engine to cool before storing.
ADJUSTING IDLE SPEED
See Figure 14.
WARNING:
The chain will move around the guide bar when
adjusting the idle speed. Wear all protective
clothing and keep all bystanders, children, and
pets at least 50 ft. away. Make adjustments
with the unit supported on a stable surface so
that the chain/guide bar does not contact the
ground or any object. Keep all parts of your
body away from the chain/guide bar and muf-
fler. Failure to follow these instructions could
result in serious personal injury.
BRAKE
POSITION
Fig. 13
Fig. 12
OPERATION
ON/STOP
SWITCH IN THE
STOP POSITION
Fig. 14
IDLE SPEED
SCREW “T”

Page 16 — English
If the engine starts, runs, and accelerates,
but will not idle, turn the idle speed screw “T”
clockwise to increase idle speed.
If the chain turns at idle, turn the idle speed
screw “T” counterclockwise to reduce the
idle RPM and stop the chain movement. If the
saw chain still moves at idle speed, contact an
authorized service center for adjustment and
discontinue use until the repair is made.
WARNING:
THE SAW CHAIN SHOULD NEVER TURN AT
IDLE. Turn the idle speed screw “T” counter-
clockwise to reduce the idle RPM and stop the
chain, or contact an authorized service center
for adjustment and discontinue use until the
repair is made. Serious personal injury could
result from the saw chain turning at idle.
PULL AND PUSH
See Figure 15.
The reaction force of the saw is always opposite to
thedirectionthe chainismoving.Thus,the operator
must be ready to control the PULL when cutting
on the bottom edge of the bar and the PUSH when
cutting along the top edge.
NOTE: The chain saw has been fully factory
tested. It is normal to find some slight oil residue
on the saw.
Fig. 15
PULL
PUSH
OPERATION
WARNING:
KICKBACK occurs when the moving chain
contacts an object at the upper portion of the
tip of the guide bar or when the wood closes in
and pinches the saw chain in the cut. Contact
at the upper portion of the tip of the guide bar
can cause the chain to dig into the object and
stop the chain for an instant. The result is a
lightning-fast reverse reaction which kicks the
guide bar up and back toward the operator. If
the saw chain is pinched along the top of the
guide bar, the guide bar can be driven rapidly
back toward the operator. Either of these reac-
tions can cause loss of saw control, which can
result in serious injury.
Do not rely exclusively upon the safety devices
built into the saw. As a chain saw user, you
should take steps to keep your cutting jobs
free from accident or injury. See General Safety
Rules for more details.

Page 17 — English
KICKBACK PRECAUTIONS
See Figures 16 - 17.
Rotationalkickback occurs whenthe moving chain
contacts an object at the Kickback Danger Zone of
the guide bar. The result is a lightning-fast reverse
reaction, which kicks the guide bar up and back
towards the operator. This reaction can cause loss
of control, which can result in serious injury.
PREPARING FOR CUTTING
PROPER GRIP ON HANDLES
See Figure 18.
See General Safety Rules for appropriate safety
equipment.
Wear non-slip gloves for maximum grip and
protection.
Hold the saw firmly with both hands. Always
keep your left hand on the front handle and your
right hand on the rear handle so that your body
is to the left of the chain line.
WARNING:
Never use a left-handed (cross-handed) grip or
any stance that would place your body or arm
across the chain line.
Maintain a proper grip on the saw whenever the
engine is running. The fingers should encircle
the handle and the thumb is wrapped under the
handlebar. This grip is least likely to be broken
by a kickback or other sudden reaction of the
saw. Any grip in which the thumb and fingers
are on the same side of the handle is dangerous
because a slight kick of the saw can cause loss
of control.
ROTATIONAL
KICKBACK
Fig. 17
KICKBACK
DANGER ZONE
Fig. 16
PROPER GRIP IMPROPER GRIP
WARNING:
DO NOT operate the throttle
trigger with your left hand
and hold the front handle
with your right hand. Never
allow any part of your body
to be in the chain line while
operating a saw. Improper
operation of the chain saw
could result in serious per-
sonal injury.
CHAIN
LINE
PROPER HAND GRIP
POSITION
Fig. 18
OPERATION

Page 18 — English
Fig. 19
Fig. 20
PROPER CUTTING STANCE
See Figure 19.
WARNING:
Alway use the proper cutting stance described
in this section. Never kneel when using the
chain saw except when felling a tree as shown
in figure 25. Kneeling could result in loss of sta-
bility and control of the saw resulting in serious
personal injury.
Balance your weight with both feet on solid
ground.
Keep left arm with elbow locked in a “straight
arm” position to withstand any kickback force.
Keep your body to the left of the chain line.
Keep your thumb on underside of handlebar.
WORK AREA PRECAUTIONS
See Figure 20.
Cut only wood or materials made from wood;
no sheet metal, no plastics, no masonry, no
non-wood building materials.
■Never allow children to operate the saw. Allow
no person to use this chain saw who has
not read this operator’s manual or received
adequate instructions for the safe and proper
use of this chain saw.
■Keep everyone – helpers, bystanders, children,
and animals, a safe distance from the cutting
area. During felling operations, the safe dis-
tance should be a least twice the height of the
largest trees in the felling area. During bucking
operations, keep a minimum distance of 15 feet
between workers.
■Always cut with both feet on solid ground to
prevent being pulled off balance.
■Do not cut above chest height as a saw held
higher is difficult to control against kickback
forces.
■Do not fell trees near electrical wires or build-
ings. Leave this operation for professionals.
■Cut only when visibility and light are adequate
for you to see clearly.
BASIC OPERATING/CUTTING
PROCEDURES
Practicecutting a fewsmalllogs using thefollowing
technique to get the “feel” of using the saw before
you begin a major sawing operation.
Take the proper stance in front of the wood with
the saw idling.
Accelerate the engine to full throttle just before
entering the cut by squeezing the throttle trigger.
Begin cutting with the saw against the log.
Keep the engine at full throttle the entire time
you are cutting.
Allow the chain to cut for you; exert only light
downward pressure. Forcing the cut could result
in damage to the bar, chain, or engine.
Release the throttle trigger as soon as the cut is
completed allowing the engine to idle. Running
the saw at full throttle without a cutting load can
result in unnecessary wear to the chain, bar, and
engine.
Do not put pressure on the saw at the end of
the cut.
STRAIGHT
ARM
CHAIN LINE
THUMB ON
UNDERSIDE OF
HANDLE BAR
OPERATION

Page 19 — English
FELLING TREES
HAZARDOUS CONDITIONS
See Figures 21 - 25.
WARNING:
Do not fell trees during periods of high wind or
heavy precipitation. Wait until the hazardous
weather has ended.
WARNING:
Closely check for broken or dead branches,
which could fall while cutting and do not cut
near buildings or electrical wires if you do not
know the direction of tree fall. Do not cut at
night or during bad weather conditions, such as
rain, snow, or strong winds, which can reduce
visibility and control of the chain saw. If the tree
you are felling makes contact with any utility
line, you should discontinue use of the chain
saw and immediately notify the utility company.
Failure to follow these instructions could result
in death or serious personal injury.
When felling a tree, it is very important that you
closely follow these warnings and instructions to
prevent possible death or serious personal injury.
■Do not cut down trees having an extreme lean
or large trees with rotten limbs, loose bark,
or hollow trunks. Have these trees pushed or
dragged down with heavy equipment, then cut
them up.
■Do not cut trees near electrical wires or buildings.
■Check the tree for damaged or dead branches
that could fall and hit you during felling.
■Periodically glance at the top of the tree during
the backcut to assure the tree is going to fall in
the desired direction.
If the tree starts to fall in the wrong direction,
or if the saw gets caught or hung up during the
fall, leave the saw and save yourself!
 Felling a tree – When bucking and felling opera-
tions are being performed by two or more per-
sons, at the same time, the felling operation
should be separated from the bucking operation
by a distance of at least twice the height of the
tree being felled. Trees should not be felled in a
manner that would endanger any person, strike
Fig. 21
OPERATION
45°
45°
PLANNED LINE
OF FALL
RETREAT PATH
RETREAT PATH
FELLING
DIRECTION
LINE
PLANNED
LINE OF
FALL
TREE
Fig. 22
any utility line or cause any property damage. If
the tree does make contact with any utility line, the
utility company should be notified immediately.

Page 20 — English
HINGE
2 in. OR 1/10 DIA
NOTCH -
APPROX. 1/3
DIAMETER OF
TRUNK
BACK CUT
2 in. Fig. 23
WEDGE
Before any cuts are started, pick your escape
route (or routes in case the intended route is
blocked); clear the immediate area around the
tree and make sure there are no obstructions in
your planned path of retreat. Clear paths of safe
retreat should extend back and diagonally (45°)
to the rear of the planned line of fall. When the
tree begins to fall, you should retreat away from
the direction of fall along a retreat path and at
least 20 feet away from the trunk in case it kicks
back over the stump. See Figure 21.
Before felling is started, consider the force and
direction of the wind, the lean and balance of
the tree, and the location of large limbs. These
things influence the direction in which the tree
will fall. Do not try to fell a tree along a line dif-
ferent from its natural line of fall.
The chain saw operator should keep on the
uphill side of the terrain as the tree is likely to
roll or slide downhill after it is felled.
Remove dirt, stones, loose bark, nails, staples,
and wire from the tree where felling cuts are to
be made.
NOTE: Before every cut, make sure the felling
direction line on the saw housing is aligned with
the desired path for the tree to fall. Figure 22 shows
how the felling direction line is used when making
the back cut.
Notched Undercut. Cut a notch about 1/3 the
diameter of the tree as shown in figure 23. Make
the cuts of the notch so they intersect at a right
angle to the line of fall. This notch should be
cleaned out to leave a straight line. To keep the
weight of the wood off the saw, always make
the lower cut of the notch before the upper cut.
See Figure 23.
Felling Backcut. The backcut is always made
level and horizontal, and at a minimum of 2 in.
above the horizontal cut of the notch. See Figures
23 - 24.
Never cut through to the notch. Always leave a
band of wood between the notch and backcut
(approximately 2 in. or 1/10 the diameter of the
tree). This is called “hinge” or “hingewood.” It
controls the fall of the tree and prevents slip-
ping or twisting or shoot-back of the tree off the
stump. See Figures 23 - 24.
HINGE
BACK CUT
Fig. 24
OPERATION
Fig. 25
On large diameter trees, stop the back cut
before it is deep enough for the tree to either
fall or settle back on the stump. Then insert
soft wooden or plastic wedges into the cut so
they do not touch the chain. The wedges can
be driven in, little by little, to help jack the tree
over. See Figure 25.
NOTE: When bucking or felling with a wedge,
it may be necessary to remove the SAFE-T-TIP
anti-kickback nose guard to allow the bar to be