Ryobi RY10519A, RY10521A Owner's Manual
OPERATOR’S MANUAL
RY10521A / 20 in. 46cc Chain Saw
Scie à chaîne de 46 cc de 508 mm (20 po)
Motosierra de 508 mm (20 pulg.), 46 cc
RY10519A / 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
MANUEL D’UTILISATION
MANUAL DEL OPERADOR
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.
Your chain saw has been engineered and manufactured to Ryobi’s 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 buying a Ryobi product.
SAVE THIS MANUAL FOR FUTURE REFERENCE
Cette scie à chaîne a été conçue et fabriquée conformément aux
strictes normes de fiabilité, simplicité d’emploi et sécurité d’utilisation
de Ryobi. Correctement entretenue, elle vous donnera des années
de fonctionnement robuste et sans problème.
Su motosierra ha sido diseñada y fabricada de conformidad con las
estrictas normas de Ryobi para brindar fiabilidad, facilidad de uso
y seguridad para el operador. Con el debido cuidado, le brindará
muchos años de sólido y eficiente funcionamiento.
AVERTISSEMENT : Pour réduire les risques de
blessures, l’utilisateur doit lire et veiller à bien comprendre le
manuel d’utilisation avant d’employer ce produit.
Merci d’avoir acheté un produit Ryobi.
CONSERVER CE MANUEL POUR
FUTURE RÉFÉRENCE
ADVERTENCIA: Para reducir el riesgo de lesiones,
el usuario debe leer y comprender el manual del operador antes
de usar este producto.
Le agradecemos la compra de un producto Ryobi.
GUARDE ESTE MANUAL PARA
FUTURAS CONSULTAS
TABLE OF CONTENTS
TABLE DES MATIÈRES / ÍNDICE DE CONTENIDO
Introduction .......................................................................................................................................2
Introduction / Introducción
General Safety Rules ..................................................................................................................... 3-4
Règles de sécurité générales / Reglas de seguridad generales
Specific Safety Rules .................................................................................................................... 4-5
Règles de sécurité particulières / Reglas de seguridad específicas
Symbols ........................................................................................................................................ 6-7
Symboles / Símbolos
Glossary of Terms ..............................................................................................................................8
Glossaire / Glosario de términos
Features ....................................................................................................................................... 9-10
Caractéristiques / Características
Assembly ......................................................................................................................................... 11
Assemblage / Armado
Operation ................................................................................................................................... 11-24
Utilisation / Funcionamiento
Maintenance .............................................................................................................................. 25-37
Entretien / Mantenimiento
Bar and Chain Combinations .......................................................................................................... 38
Vue éclatée et liste des pièces / Vista desarrollada y lista de piezas
Troubleshooting ......................................................................................................................... 38-39
Dépannage / Corrección de problemas
Warranty ..........................................................................................................................................40
Garantie / Garantía
Parts Ordering and Service ............................................................................................... Back Page
Commande de pièces et réparation / Pedidos de piezas y servicio ......................................................... Page arrière / Pág. posterior
INTRODUCTION
INTRODUCTION / INTRODUCCIÓN
This product has many features for making its use more pleasant and enjoyable. Safety, performance,
and dependability have been given top priority in the design of this product making it easy to maintain
and operate.
* * *
Ce produit offre de nombreuses fonctions destinées à rendre son utilisation plus plaisante et satisfaisante. Lors de la conception de ce produit, l’accent a été mis sur la sécurité, les performances et la
fiabilité, afin d’en faire un outil facile à utiliser et à entretenir.
* * *
Este producto ofrece numerosas características para hacer más agradable y placentero su uso. En el
diseño de este producto se ha conferido prioridad a la seguridad, el desempeño y la fiabilidad, por lo
cual se facilita su manejo y mantenimiento.
Page 2
GENERAL SAFETY RULES
WARNING:
Read and understand all instructions. Failure
to follow all instructions listed below, may result
in electric shock, fire and/or serious personal
injury.
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.
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.
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
Page 3 — English
GENERAL SAFETY RULES
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; 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 (or electrically
powered saw) is classified by CSA as a
Class 1C (or Class 2C) 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.
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
Page 4 — English
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.
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.
SPECIFIC SAFETY RULES
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 barefoot. 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
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 pres-
sure 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.
SAVE THESE INSTRUCTIONS
Page 5 — English
SYMBOLS
The following signal words and meanings are intended to explain the levels of risk associated with
this product.
SYMBOL SIGNAL MEANING
DANGER:
WARNING:
CAUTION:
NOTICE:
Indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided,
may result in minor or moderate injury.
(Without Safety Alert Symbol) Indicates important information
not related to an injury hazard, such as a situation that may
result in property damage.
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
Safety Alert Indicates a potential personal injury hazard.
Read Operator’s Manual
Wear Eye, Hearing, and
Head Protection
SAFE-T-TIP® Nose Guard
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.
Carbon Monoxide
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Wear eye protection with side shields marked to comply
with ANSI Z87.1 as well as hearing and head protection
when operating this equipment.
The SAFE-T-TIP® nose guard on the guide bar helps prevent
kickback.
Engines produce carbon monoxide which is an odorless,
deadly poison. Do not operate in an enclosed area.
Kickback DANGER! Beware of kickback.
Bar Nose Contact Avoid bar nose contact.
Wear Gloves
Wear Safety Footwear
Gasoline and
Lubricant
Keep Bystanders Away Keep all bystanders and animals at least 50 ft. away.
Wear non-slip, heavy-duty protective gloves when handling
the chain saw.
Wear non-slip safety footwear when using this
equipment.
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
GLOSSARY OF TERMS
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 performance requirements of ANSI B175.1 when tested
on a representative sample of chain saws.
Normal Cutting Position
Those positions assumed in performing the bucking
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 performance 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 supported 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.
Page 8 — English
PRODUCT SPECIFICATIONS
FEATURES
Bar length:
RY10521A ............................................... 20 in.
RY10519A ............................................... 18 in.
Chain pitch ............................................. .325 in.
Chain gauge ........................................... .050 in.
Chain type ............................................ Standard
MUFFLER
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.
Weight - No bar, chain, fuel or lubricant ... 11 lbs.
STARTER GRIP
AND ROPE
TRIGGER
RELEASE
THROTTLE
TRIGGER
CYLINDER
COVER
REAR
HANDLE
PRIMER
BULB
FRONT
HANDLE
CHOKE
LEVER
FELLING
DIRECTION
LINE
CHAIN OIL
CAP
FRONT HAND GUARD/
CHAIN BRAKE
SAFE-T-TIP®
CLUTCH COVER
BAR
MOUNTING
NUTS
CHAIN TENSIONING
SCREW
Fig. 1a
Page 9 — English
FELLING
DIRECTION
LINE
STARTER/FAN
HOUSING
FEATURES
FUEL CAP
ON/STOP
SWITCH
AIR FILTER
COVER
STARTER GRIP
AND ROPE
REAR
HANDLE
THROTTLE
TRIGGER
Fig. 1b
KNOW YOUR CHAIN SAW
See Figures 1a - 1b.
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.
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 tip that offers a somewhat lower 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 car buretor.
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.
Page 10 — English
ASSEMBLY
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 properly 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 operated the product.
If any parts are damaged or missing, please call
1-800-860-4050 for assistance.
PACKING LIST
Chain Saw
Scabbard
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
condition leading to possible serious personal
injury.
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:
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.
NOTE: The chain saw has been fully factory 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.
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.
Page 11 — English
OPERATION
WARNING:
Operation of this equipment may create sparks
that can start fires around dry vegetation.
A spark arrestor may be required. The operator should contact local fire agencies for
laws or regulations relating to fire prevention
requirements.
APPLICATIONS
You may use this product for the purposes listed
below:
Basic limbing, felling, and bucking
Removing buttress roots
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:
Clean up spilled fuel immediately.
Refer to Refueling in the Specific Safety Rules
section of this manual for additional safety information.
MIXING THE FUEL
This product is powered by a 2-cycle engine and
requires pre-mixing gasoline and 2-cycle lubricant.
Pre-mix unleaded gasoline and 2-cycle engine
lubricant in a clean container approved for gasoline. 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 automotive use.
NOTE: We recommend you use 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).
Do not use automotive lubricant or 2-cycle outboard
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)
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.
Page 12 — English
OXYGENATED 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.
Fuel system damage or performance problems
resulting from the use of an oxygenated fuel containing more than the percentage of oxygenates
stated below are not covered under warranty.
Ethanol. Gasoline containing up to 10% ethanol by
volume (commonly referred to as E10) is acceptable. E15 and E85 are not.
OPERATION
FILLING THE FUEL TANK
See Figure 2.
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.
Prior to replacing the fuel cap, clean and inspect the
o-ring.
Immediately replace the fuel cap and hand
tighten, by turning clockwise. Wipe up any fuel
spillage.
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.
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
perform over a wide temperature range with no dilution required. Chain saw should use approximately
one tank of lubricant per tank of fuel.
NOTE: Do not use dirty, used, or otherwise contaminated 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.
Fig. 2
Page 13 — English
Fig. 3
OPERATION
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.
BRAKE
POSITION
Fig. 4
RUN
POSITION
Fig. 5
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 immediate vicinity that could come in contact with the
bar and chain.
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.
Page 14 — English
Fig. 6
ON/STOP
SWITCH
SWITCH IN THE
RUN POSITION
Fig. 7
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
OPERATION
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 temperature.
RUN
POSITION
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.
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.
Fig. 8
PRIMER BULB
Fig. 9
CHOKE
LEVER
Fig. 10
Page 15 — English
TRIGGER
RELEASE
THROTTLE
TRIGGER
Fig. 11
OPERATION
STOPPING THE ENGINE
See Figures 12 - 13.
Release the throttle trigger and let the engine return
to idle. To stop the engine, move the on/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.
In the event that the on/stop switch will not 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.
ON/STOP
SWITCH IN THE
STOP POSITION
Fig. 12
BRAKE
POSITION
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 muffler. Failure to follow these instructions could
result in serious personal injury.
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.
Fig. 13
IDLE SPEED
SCREW “T”
Fig. 14
Page 16 — English
OPERATION
WARNING:
THE SAW CHAIN SHOULD NEVER TURN AT
IDLE. Turn the idle speed screw “T” counterclockwise 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
the direction the chain is moving. 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.
PULL
PUSH
Fig. 15
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 reactions 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
OPERATION
KICKBACK PRECAUTIONS
See Figures 16 - 17.
Rotational kickback occurs when the 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.
KICKBACK
DANGER ZONE
Fig. 16
ROTATIONAL
KICKBACK
Fig. 17
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.
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.
CHAIN
LINE
PROPER HAND GRIP
POSITION
PROPER GRIP IMPROPER GRIP
Fig. 18
Page 18 — English
OPERATION
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 24. Kneeling could result in loss of stability 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.
THUMB ON
UNDERSIDE OF
HANDLE BAR
CHAIN LINE
STRAIGHT
ARM
Fig. 19
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
distance 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.
Fig. 20
BASIC OPERATING/CUTTING
PROCEDURES
Practice cutting a few small logs using the following
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
Page 19 — English
OPERATION
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.
FELLING TREES
HAZARDOUS CONDITIONS
WARNING:
Do not fell trees during periods of high wind or
heavy precipitation. Wait until the hazardous
weather has ended.
When felling a tree, it is important that you heed
the following warnings to prevent possible serious
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!
PROPER PROCEDURE FOR TREE
FELLING
See Figures 21 - 24.
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 the path of safe retreat approximately 135°
from the planned line of fall.
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 different from its natural line of fall.
PLANNED LINE
OF FALL
135° FROM
PLANNED
LINE OF FALL
PLANNED
LINE OF
FALL
BACK CUT
2 in.
135°
135°
HINGE
2 in. OR 1/10 DIA
45°
45°
90°
PATH OF
SAFE RETREAT
PATH
OF SAFE
RETREAT
90°
Fig. 21
NOTCH -
APPROX. 1/3
DIAMETER OF
TRUNK
Fig. 22
Page 20 — English
OPERATION
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.
Cut a notch about 1/3 the diameter of the trunk
in the side of the tree. Make the notch cuts 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.
Make the backcut level and horizontal, and at
a minimum of 2 in. above the horizontal cut of
the notch.
NOTE: Never cut through to the notch. Always
leave a band of wood between the notch
and back cut (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 slipping or twisting or shootback of
the tree off the stump.
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. Drive wedges in, little
by little, to help jack the tree over.
HINGE
BACK CUT
Fig. 23
PLANNED
LINE OF
FALL
TREE
NOTE: When bucking or felling with a wedge, it
may be necessary to remove the SAFE-T-TIP®
anti-kickback device to allow the bar to be
drawn through the cut. After you complete the
cut, reinstall the tip immediately.
As tree starts to fall, stop the chain saw and put
it down immediately. Retreat along the cleared
path, but watch the action in case something
falls your way.
WARNING:
Never cut through to the notch when making a
back cut. The hinge controls the fall of the tree,
this is the section of wood between the notch
and backcut.
WEDGE
FELLING
DIRECTION
LINE
Fig. 24a
Fig. 24b
Page 21 — English
OPERATION
REMOVING BUTTRESS ROOTS
See Figure 25.
A buttress root is a large root extending from the
trunk of the tree above the ground. Remove large
buttress roots prior to felling. Make the horizontal
cut into the buttress first, followed by the vertical
cut. Remove the resulting loose section from the
work area. Follow the correct tree felling procedure
as stated in Proper Procedure For Tree Felling
after you have removed the large buttress roots.
VERTICAL
CUT
LOOSE
SECTION
BUCKING
See Figure 26.
Bucking is the term used for cutting a fallen tree
to the desired log length.
Cut only one log at a time.
Support small logs on a saw horse or another
log while bucking.
Keep a clear cutting area. Make sure that no
objects can contact the guide bar nose and
chain during cutting, this can cause kickback.
To avoid the danger, keep the SAFE-T-TIP®
anti-kickback device attached while cutting.
Refer to Kickback in the Specific Safety Rules
section of this manual for more information.
During bucking operations, stand on the uphill
side so that the cut-off section of the log cannot
roll over you.
Sometimes it is impossible to avoid pinching
(with just standard cutting techniques) or difficult to predict which way a log will settle when
cut.
HORIZONTAL
CUT
Fig. 25
KICKBACK
Fig. 26
WEDGE
BUCKING WITH A WEDGE
See Figure 27.
If the wood diameter is large enough for you to
insert a soft bucking wedge without touching the
chain, you should use the wedge to hold the cut
open to prevent pinching.
NOTE: When bucking or felling with a wedge, you
may need to remove the SAFE-T-TIP® anti-kickback
device to allow the bar to be drawn through the
cut. After you complete the cut, reinstall the tip.
Page 22 — English
Fig. 27
OPERATION
BUCKING LOGS UNDER STRESS
See Figure 28.
Make the first bucking cut 1/3 of the way through
the log and finish with a 2/3 cut on the opposite
side. As you cut the log, it will tend to bend. The
saw can become pinched or hung in the log if you
make the first cut deeper than 1/3 of the diameter
of the log.
Give special attention to logs under stress to
prevent the bar and chain from pinching.
OVERBUCKING
See Figure 29.
Begin on the top side of the log with the bottom
of the saw against the log; exert light pressure
downward. Note that the saw will tend to pull
away from you.
UNDERBUCKING
See Figure 30.
Begin on the under side of the log with the top
of the saw against the log; exert light pressure
upward. During underbucking, the saw will tend
to push back at you. Be prepared for this reaction
and hold the saw firmly to maintain control.
LOG SUPPORTED AT ONE END
FINISHING CUT
1ST CUT 1/3 DIA
LOG SUPPORTED AT BOTH ENDS
1ST CUT 1/3 DIA
LOAD
FINISHING CUT
LOAD
Fig. 28
UNDERBUCKING
Page 23 — English
OVERBUCKING
Fig. 29
Fig. 30
OPERATION
LIMBING AND PRUNING
See Figures 31 - 32.
Work slowly, keeping both hands on the saw
with a firm grip. Maintain secure footing and
balance.
Keep the tree between you and the chain while
limbing.
LOAD
SECOND CUT
Do not cut from a ladder. This is extremely dan-
gerous. Leave this operation for professionals.
Do not cut above chest height. A saw held
higher than chest height is difficult to control
against kickback.
WARNING:
Never climb into a tree to limb or prune. Do
not stand on ladders, platforms, a log, or in
any position which can cause you to lose your
balance or control of the saw.
When pruning trees it is important not to make
the flush cut next to the main limb or trunk until
you have cut off the limb further out to reduce
the weight. This prevents stripping the bark from
the main member.
• Underbuck the branch 1/3 through for your
first cut.
• Overbuck the branch to drop it.
FIRST CUT
1/3 DIAMETER
FINISHING CUT
Fig. 31
CUT LIMBS ONE AT A TIME AND LEAVE SUPPORT
LIMBS UNDER TREE UNTIL LOG IS CUT
Fig. 32
• Finish by cutting smoothly and neatly against
the main member so the bark will grow back
to seal the wound.
WARNING:
If the limbs to be pruned are above chest height,
hire a professional to perform the pruning.
CUTTING SPRINGPOLES
See Figure 33.
A springpole is any log, branch, rooted stump, or
sapling which is bent under tension by other wood
so that it springs back if the wood holding it is cut
or removed. On a fallen tree, a rooted stump has
a high potential of springing back to the upright
position during the bucking cut to separate the log
from the stump. Watch out for springpoles — they
are dangerous.
Page 24 — English
SPRINGPOLE
Fig. 33
WARNING:
Springpoles are dangerous and could strike the
operator, causing the operator to lose control
of the chain saw. This could result in severe or
fatal injury to the operator.
MAINTENANCE
WARNING:
Make sure the on/stop switch is in the
STOP “ ” position and the chain has stopped
before performing any maintenance on the saw.
Failure to do so may result in serious personal
injuries.
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.
WARNING:
When servicing, use only identical replacement
parts. Use of any other parts could create a
hazard or cause product damage.
WARNING:
COMBINATION
BAR MOUNTING
NUTS
RUN
POSITION
Fig. 34
WRENCH
Fig. 35
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.
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, lubricant, grease, etc.
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.
CLUTCH
COVER
BAR MOUNTING
NUTS
Fig. 36
LUBRICATION
All of the bearings in this product are lubricated with
a sufficient amount of high grade lubricant for the
life of the unit under normal operating conditions.
Therefore, no further lubrication is required.
Page 25 — English
MAINTENANCE
REPLACING THE GUIDE BAR AND
CHAIN
See Figures 34 - 43.
DANGER:
Never start the engine before installing the
guide bar, chain, clutch cover, and clutch drum.
Without all these parts in place, the clutch can
fly off or explode, exposing the user to possible
serious injury.
WARNING:
To avoid serious personal injury, read and understand all the safety instructions in this section.
Always place the on/stop switch in the STOP
( ) position before you work on the saw.
CUTTERS
CHAIN DRIVE LINKS
CHAIN ROTATION
Make sure the chain brake is not set by pulling
the chain brake lever/hand guard towards the
front handle to the run position.
NOTE: When replacing the guide bar and chain,
always use the specified bar and chain listed in
the Bar and Chain Combinations section later
in this manual.
Wear gloves when handling the chain and bar.
These components are sharp and may contain
burrs.
Remove the bar mounting nuts using the com-
bination wrench provided or a 13 mm socket
wrench.
Remove the clutch cover.
Remove the bar and chain from the mounting
surface.
Remove the old chain from the bar.
Lay out the new saw chain in a loop and
straighten any kinks. The cutters should face
in the direction of chain rotation. If they face
backwards, turn the loop over.
Place the chain drive links into the bar groove
as shown.
Position the chain so there is a loop at the back
of the bar.
Hold the chain in position on the bar and place
the loop around the sprocket.
Fig. 37
BAR
GROOVE
CHAIN DRIVE
LINKS
Fig. 38
Fit the bar flush against the mounting surface
so that the bar studs are in the long slot of the
bar.
Replace the clutch cover ensuring that the
adjusting pin in the clutch cover is in the bar
tensioning pin hole and that both bar studs are
in their respective holes in the clutch cover.
NOTE: The adjusting pin may need to be slightly
repositioned with the chain tensioning screw
so that it is aligned with the position of the bar
chain tensioning pin hole.
Page 26 — English
MAINTENANCE
Replace and fingertighten the bar mounting
nuts. The bar must be free to move for tension
adjustment.
Remove all slack from the chain by turning the
chain tensioning screw clockwise until the chain
seats snugly against the bar with the drive links
in the bar groove.
Lift the tip of the guide bar up to check for sag.
Release the tip of the guide bar and turn the
chain tensioning screw 1/2 turn clockwise.
Repeat this process until sag does not exist.
Hold the tip of the guide bar up and tighten the
bar mounting nuts securely.
The chain is correctly tensioned when there is no
sag on the underside of the guide bar, the chain is
snug, but it can be turned by hand without binding.
Ensure that the chain brake is not set.
NOTE: If chain is too tight, it will not rotate. Loosen
the bar nuts slightly and turn the tension adjuster
1/4 turn counterclockwise. Lift the tip of the guide
bar up and retighten the bar nuts securely. Ensure
that the chain will rotate without binding.
ADJUSTING
PIN
BAR STUD HOLES
CLUTCH
COVER
BAR
MOUNTING
NUTS
SPROCKET
CHAIN
TENSIONING
SCREW
Fig. 39
Fig. 40
Page 27 — English
MAINTENANCE
ADJUSTING THE CHAIN TENSION
See Figures 44 - 46.
WARNING:
Never touch or adjust the chain while the engine
is running. The saw chain is very sharp. Always
wear protective gloves when performing maintenance on the chain.
Stop the engine before setting the chain tension.
Make sure the bar mounting nuts are loosened
to finger tight.
Turn the chain tensioning screw clockwise to
tension the chain.
NOTE: A cold chain is correctly 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.
Retension the chain whenever the flats on the
drive links hang out of the bar groove.
Fig. 41
Fig. 42
NOTE: During normal saw operation, the tem-
perature of the chain increases. The drive links
of a correctly tensioned warm chain will hang
approximately .050 in. out of the bar groove.
The tip of the combination wrench can be used
as a guide to help determine the correct warm
chain tension.
NOTE: New chains tend to stretch; check
the chain tension frequently and tension as
required.
CAUTION:
A chain tensioned while warm may be too tight
upon cooling. Check the “cold tension” before
next use.
Fig. 43
FLATS ON DRIVE LINKS
Fig. 44
Page 28 — English
MAINTENANCE
CHAIN MAINTENANCE
See Figures 47 - 48.
CAUTION:
Check that the switch is in the STOP ( ) posi-
tion before you work on the saw.
Use only a low-kickback chain on this saw. This
fast- cutting chain provides kickback reduction
when properly maintained.
For smooth and fast cutting, maintain the chain
properly.
The chain requires sharpening when the wood
chips are small and powdery, the chain must be
forced through the wood during cutting, or the
chain cuts to one side. During maintenance of the
chain, consider the following:
Improper filing angle of the side plate can
increase the risk of severe kickback.
Raker (depth gauge) clearance.
• Too low increases the potential for kickback.
• Not low enough decreases cutting ability.
If the cutter teeth hit hard objects such as nails
and stones, or are abraded by mud or sand on
the wood, have an authorized service center
sharpen the chain.
≈ .050 in.
Fig. 45
≈ .050 in.
Fig. 46
RAKER (DEPTH GAUGE) CLEARANCE
.025 in.
Fig. 47
INSPECT
DRIVE
SPROCKET
NOTE: Inspect the drive sprocket for wear or
damage when replacing the chain. If signs of
wear or damage are present in the areas indicated, have the drive sprocket replaced by an
authorized service center.
NOTE: If you do not fully understand the correct
procedure for sharpening the chain after reading the
instructions that follow, have the saw chain sharpened by an authorized service center or replace
with a recommended low-kickback chain.
Page 29 — English
Fig. 48
MAINTENANCE
SHARPENING THE CUTTERS
See Figures 49 - 52.
Be careful to file all cutters to the specified angles
and to the same length, as fast cutting can only be
obtained when all cutters are uniform.
WARNING:
The saw chain is very sharp. Always wear protective gloves when performing maintenance to
the chain to prevent serious personal injury.
Tension the chain prior to sharpening. Refer to
Adjusting The Chain Tension.
Use a 3/16 in. diameter round file and holder.
Do all of your filing at the midpoint of the bar.
Keep the file level with the top plate of the tooth.
Do not let the file dip or rock.
Using light but firm pressure. Stroke towards
the front corner of the tooth.
Lift the file away from the steel on each return
stroke.
TOP PLATE
RIVET HOLE
HEEL
CUTTING
CORNER
GULLET
SIDE PLATE
DEPTH GAUGE
TOE
Fig. 49
Fig. 50
Put a few firm strokes on every tooth. File all left
hand cutters in one direction. Then move to the
other side and file the right hand cutters in the
opposite direction.
Remove filings from the file with a wire brush.
NOTICE:
A dull or improperly sharpened chain can cause
excessive engine speed during cutting, which
may result in severe engine damage.
WARNING:
Improper chain sharpening increases the potential of kickback.
WARNING:
Failure to replace or repair a damaged chain
can cause serious injury.
RIGHT HAND
CUTTERS
Fig. 51
LEFT HAND
CUTTERS
Fig. 52
Page 30 — English
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