Ryobi CS-4016 Operation manual

OWNER’S OPERATING MANUAL
PETROL CHAIN SAW
MODEL CS-4016/CS-4518/ES-4520
KEEP THIS MANUAL FOR FUTURE REFERENCE
Your new petrol chain saw has been engineered and manufactured to
Ryobi’s high standard of dependability, ease of operation and operator safety.
Properly cared for, it will give you years of rugged, trouble free performance. If
you use your petrol chain saw properly and only for what it is intended, you
will enjoy years of safe, reliable service.
SPECIFICATIONS
THANK YOU FOR BUYING A RYOBI
GASOLINE CHAIN SAW
CAUTION: Carefully read through this entire owner’s
manual, paying close attention to the general
safety rules and rules for safe operation,
before using.
1
Max cutting length
Model CS-4016
380mm
1.6kW 1.8kW 1.8kW
10000min-1
25:1
580 ml
250 ml
air cooling single cylinder
455mm
6.8kg6.35kg 7kg
500mm
CS-4518 ES-4520
Engine type
Engine power
Rated output power
Maximum engine speed
Fuel mixing ratio
Fuel tank capacity
Oil tank capacity
Nett weight
2 stroke 40cc 2 stroke 45cc 2 stroke 45cc

2
GENERAL SAFETY RULES
The purpose of safety rules is to attract your
attention to possible dangers. The safety symbols
and the explanations with them, require your
careful attention and understanding. The safety
warnings do not by themselves eliminate any
danger. The instruction or warnings they give are
not substitutes for proper accident prevention
measures.
SAFETY ALERT SYMBOL. Indicates
caution or warning. May be used in
conjunction with other symbols or
pictures.
Failure to obey a safety warning can result in
serious injury to yourself or to others. Always follow
the safety precautions to reduce the risk of fire,
electric shock and personal injury.
Do not attempt to operate this tool until you have
read thoroughly and completely understood the
safety rules, etc. contained in this manual. Failure
to comply can result in accidents involving fire,
electric shock or serious personal injury. Save this
wners perating Manual and review it frequently
for continual safe operation and for instructing
others who may use this tool.
GENERAL REQUIREMENTS
1. The saw is specially designed for tree service,
i.e. for off-ground working in trees, and when
being used as such should only be used by
trained operators.
2. ne handed operation of the saw can be
dangerous.
3. Be alert for the phenomena “skating” and
“bouncing”, greater risk from kickback.
4. Be cautious not to lose balance of your body
due to “drop” at the end of a cut.
5. If working off the ground the operator must be
trained in safe climbing techniques and use all
recommended safety equipment such as
harness, loops, strops, ropes and karabiners
for themselves and for the saw.
6. When hoisting a chain saw using a rope tied to
a lifting hook for operation on a tree, ensure
that the lifting hook is not strained by excessive
force.
PHYSICAL CONDITION
1. Do not operate a chain saw when you are tired
or under the influence of alcohol or drugs.
2. You should be in good physical and mental
health in order to handle your chain saw safely.
Errors in judgment or execution can be serious
or fatal. If you have any physical condition
which strenuous work could worsen, check with
your physician before using a chain saw. Do
not operate when ill or tired, or under the
influence of any substance or medication which
could affect your vision, dexterity or judgement.
PERSONAL PROTECTI E EQUIPMENT (PPE)
1. Always wear approved goggles to protect your
eyes. Wood chips, dust, snapping branches
and other debris can be tossed by the cutting
chain into the operator’s facial area. Goggles
may also offer limited protection in the event of
the cutting chain hitting the operator in the eye
area. If conditions warrant that a ventilated face
shield should be worn, goggles must be worn
underneath it.
2. We recommend wearing hearing protection at
all times. If not followed, hearing loss can
occur. You should reduce the risk of hearing
damage by wearing either “headset” type
protectors or ear plugs which are approved by
an authorised organisation.
3. All persons who make part of their living using
chain saws should be tested periodically for
hearing deterioration.
The operation of any tool
can result in foreign objects
being thrown into your
eyes, which can result in
severe eye damage.
Before beginning power
tool operation, always wear safety goggles or
safety glasses with side shields and a full face
shield when needed. We recommend Wide
Vision Safety Mask for use over eye glasses or
standard safety glasses with side shields.
Due to continued product
refinement policy, product features
and specifications can and will
change without notice. Check
current features and specifications
with your retailer.

3
GENERAL SAFETY RULES
CAUTION. Stuffing ears with cotton is
not recommended
4. Always wear a cap or hat when working with a
chain saw. A safety hard hat is highly
recommended when felling or working under
trees, or when objects can fall on you.
5. Wear heavy duty, non-slip gloves for improved
grip, and also for protection against cold and
vibration.
6. Safety tip shoes or boots with non-slip sole
should be worn.
7. Use eye protection and protective clothing,
including gloves and foot protection suitable for
tree climbing.
8. Never wear loose clothing, unbuttoned jackets,
flared sleeves and cuffs, scarfs, tie-strings,
neckties, cords, chains, jewelry, etc. which
could snag the saw chain or underbrush.
9. Clothing should be sturdy, protective material. It
should be snug-fitting to resist snagging, but
roomy enough for freedom of movement.
10. Trouser legs should not be flared or cuffed, and
should be either tucked into the boot tops or
trimmed short.
11. Safety vests, leg chaps and logger’s pants of
heavy leather material are available.
12. It is the operator’s responsibility to wear such
additional protection if conditions warrant it.
13. Never operate a chain saw when you are
alone. Arrange to have someone remain within
calling distance in case you need help.
FUEL
WARNING. Petrol and fuel are extremely
flammable. If spilled or ignited by ignition
source, it can cause fire and serious
injury or property damage. Extra caution
is required, when handling petrol or fuel.
1. Use an appropriate typefuel container .
2. Do not smoke or bring flame or sparks near fuel
supplies.
3. The fuel tank may be under pressure. Always
loosen the fuel cap and wait for pressure to be
equalized before removing the cap.
4. When fuel tank cap or oil tank cap is difficult to
remove by hand, place the attached socket
wrench into the groove of cap and turn it
anticlockwise.
5. Fill the fuel tank outdoors over bare ground and
install the fuel cap securely. Do not pour fuel
indoors.
6. Wipe any spilled fuel off the unit.
7. Never refuel while the engine is still hot, or fuel
a running engine.
8. Do not store the unit with fuel in its tank,
because a fuel leak could start a fire.
9. Bring an extinguisher or shovel in case of fire.
Despite the precautions which can be taken,
operating a chain saw, or just working in the
forest, presents dangers.
10. After refueling, tighten fuel cap firmly and check
for leakage. In case of fuel leakage, repair
before starting operation since there is a
danger of fire.
NOTE. Do not press socket wrench
forcefully, since tank cap is plastic.
Pressing forcefully can damage tank
cap. If tank cap is damaged, do not start
engine.
RULES FOR SAFE OPERATION
STARTING ENGINE
1. Move the chain saw at least 3m from the
fuelling point before starting the engine.
2. Do not allow other persons to be near the chain
saw when you are starting or cutting with the
chain saw. Keep bystanders and animals out of
the work area. Do not let anyone hold wood for
you to cut.
3. Do not start cutting until you have a clear work
area, secure footing, and a planned retreat
path from the falling tree.
4. Before you start the engine, make sure that the
saw chain is not in contact with any object.
5. Keep the handles dry, clean, and free of oil or
fuel mixture.

4
RULES FOR SAFE OPERATION
6. perate the chain saw only in well ventilated
areas. Exhaust gas, oil mist (from chain saw
lubrication) or saw dust is harmful to health.
7. Starting must always be done with the chain
saw break deactivated - in off position.
8. When starting the chain saw place the unit on a
flat ground and hold the front handle with left
hand and firmly hold the rear end or rear
handle with right knee and pull starter handle
with right hand.
WARNING. Do not drop start the chain
saw, drop start chain saw in an insecure
position can result in injury. Start the
chain saw in a correct manner.
TRANSPORTATION
1. When transporting your chain saw, use the
appropriate guide bar cover.
2. Carry the chain saw with the engine stopped,
the guide bar and saw chain to the rear, and
the silencer away from your body.
KICKBACK SAFETY PRECAUTIONS
WARNING. Avoid kickback which can
result in serious injury. Kickback is the
backward, upward or sudden forward
motion of the guide bar occuring when
the saw chain near the upper tip 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.
Contacting a foreign object in the wood
can also result in loss of chain saw
control.
1. Rotational kickback can occur when the moving
chain contacts an object at the upper tip of the
guide bar. This contact can cause the chain to
dig into the object, which stops the chain for an
instant. The result is a lightning fast, reverse
reaction which kicks the guide bar up and back
towards the operator.
2. Pinch-kickback can occur when the wood
closes in and pinches the moving saw chain in
the cut along the top of the guide bar and the
saw chain is suddenly stopped. This sudden
stopping of the chain results in a reversal of the
chain force used to cut wood and causes the
saw to move in the opposite direction of the
chain rotation. The saw is driven straight back
towards the operator.
3. Pull-in can occur when the moving chain
contacts a foreign object in the wood in the cut
along the bottom of the guide bar and the saw
chain is suddenly stopped. This sudden
stopping pulls the saw forward and away from
the operator and could easily cause the
operator to lose control of the saw.
REDUCE THE CHANCE OF KICKBACK
1. Recognise that kickback can happen. With a
basic understanding of kickback, you can
reduce the element of surprise which
contributes to accidents.
2. Never let the moving chain contact any object
at the tip of the guide bar.
3. Keep working area free from obstructions such
as other trees, branches, rocks, fences,
stumps, etc. Eliminate or avoid any obstruction
that your saw chain could hit while cutting.
4. When cutting a branch, do not let the guide bar
contact another branch or other objects around
it.
5. Keep saw chain sharp and properly tensioned.
A loose or dull chain can increase the chance
of kickback. Follow manufacturer’s chain
sharpening and maintenance instructions.
Check tension at regular intervals, but never
with engine running. Make sure chain brake
nuts are securely tightened.
6. Begin and continue cutting at full speed. If the
chain is moving at a slower speed, there is
greater chance of kickback occuring.
7. Use extreme caution when reentering a cut.
8. Do not attempt cuts starting with the tip of the
bar (plunge cuts).
9. Watch for shifting logs or other forces that
could close a cut and pinch or fall into chain.
A OID PINCH-KICKBACK
1. Be extremely aware of situations or
obstructions that can cause material to pinch
the top of or otherwise stop the chain.
2. Do not cut more than one log at a time.
3. Do not twist saw as bar is withdrawn from an
undercut when bucking.
A OID PULL-IN
1. Always begin cutting with the engine at full
speed and the saw housing against wood.
2. Use wedges made of plastic or wood. Never
use metal to hold the cut open.
OTHER SAFETY PRECAUTIONS
It is believed that a condition called Raynaud’s
Phenomenon, which affects the fingers of certain
individuals, may be brought about by exposure to
cold and vibration. Accordingly, your chain saw has

5
GENERAL SAFETY RULES
shock mounts designed to reduce the intensity of
vibration received through the handles. Exposure
to cold and vibration may cause tingling and
burning followed by loss of colour and numbness in
the fingers. We strongly recommend you taking the
following precautions because the minimum
exposure which might trigger the ailment is
unknown.
1. Keep your body warm, especially the head and
neck, feet and ankles, and hands and wrists.
2. Maintain good blood circulation by performing
vigorous arm exercises during frequent work
breaks and also by not smoking.
3. Limit the number of hours of chain saw
operation. Try to fill a part of each work day
with jobs other than chain sawing.
4. If you experience discomfort, redness and
swelling of the fingers, followed by whitening
and loss of feeling, consult your physician
before further exposing yourself to cold and
vibration.
REPETITIVE STRESS INJURIES
It is believed that over using the muscles and
tendons of the fingers, hands, arms and shoulders
may cause soreness, swelling, numbness,
weakness and extreme pain to the areas just
mentioned. To reduce the risk of repetitive stress
injury, do the following.
1. Avoid using your wrist in a bent, extended or
twisted position. Instead, try to maintain a
straight wrist position. Also, when grasping, use
your whole hand, not just the thumb and index
finger.
2. Take periodic break to minimise repetition and
rest your hands.
3. Reduce the speed and force in which you do
the repetitive movement.
4. Do exercises to strengthen the hand and arm
muscles.
5. See a doctor if you feel tingling, numbness or
pain in the fingers, hands, wrists or arms.
MACHINE CONDITIONS
Do not operate a chain saw that is damaged.
Improperly adjusted, or not completely and
securely assembled. Do not operate the chain saw
with a loose of defective silencer. Be sure that the
saw chain stops moving when the throttle control
trigger is released.
CUTTING
1. Do not operate a chain saw in a tree unless
you have been specifically trained to do so.
2. Keep all parts of your body away from the saw
chain when the engine is running.
3. Use extreme caution when cutting small-size
bushes and saplings because slender material
may catch the saw chain and be whipped
toward you or pull you off balance.
4. When cutting a limb that is under tension, be
alert for spring back so that you will not be
struck by the limb or chain saw when the
tension in the wood fibers is released.
5. Cutting while on a ladder is extremely
dangerous because the ladder can slip and
your control of the chain saw is limited. Working
aloft should be left to professionals.
6. Stop the engine before setting the chain saw
down.
SERVICES
All chain saw service, other than items listed in the
operator’s manual maintenance instruction, should
be performed by competent service personnel. (For
example, if 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).
WOOD PRACTICES
1. Operating a chain saw safely requires a chain
saw in proper working order, sound judgment,
and knowledge of the methods which should be
applied in each cutting situation.
2. Do not let any person use your saw unless they
have read this operator’s manual and fully
understands its instructions.
3. Never let children operate the saw.
4. Use your saw only to cut wood or wood
products. Do not cut solid metal, sheet metal,
plastics or any non-wood materials.
5. Stay on the uphill side when bucking or
lambing logs which might roll when cut.
6. Keep both feet on the ground. Do not work
from off the ground positions.
CHAIN BRAKE
Always check that the chain brake works properly
before use. The chain brake’s function is to stop
chain rotation after a kickback. It neither prevents
nor reduces kickback. Do not depend on the chain
brake for protection against kickback. Even with a
chain brake, depend on your own good sense and
proper cutting methods just as though there was
chain brake. Even with normal use and proper
maintenance, the response time of the brake may
lengthen.

6
RULES FOR SAFE OPERATION
The following may interfere with the brake’s ability
to protect the operator:
1. Saw wrongly held too close to the operator’s
body. Kickback time may be too fast even for a
perfectly maintained brake to work in time.
2. The operator’s hand may not be in position to
contact the hand guard.
3. Brake will not be tripped.
4. Lack of proper maintenance lengthens the
brake’s stopping time, making it less effective.
5. Dirt, grease, oil, pitch, etc. getting into the
working parts of the mechanism may lengthen
the stopping time.
6. Wear and fatigue of the activating brake spring,
and wear of the brake/clutch drum and pivot
point may lengthen the brake’s stopping time.
7. A damaged hand guard and lever may render
the brake inoperative.
1. Chain bar
2. Saw chain
3. Chain tensioning screw
4. Bucking spikes
5. Chain brake lever / front hand guard
6. Front handle
7. Starter handle
8. Spark plug (under the air filter cover)
9. Air filter cover
10. Ignition switch
11. Safety lock
12. il tank cap
13. Fan housing
14. Fuel tank cap
15. Rear handle / bootstrap
16. Chain guard
17. Choke / (carburettor setting)
18. Bar fastening nuts
19. Throttle lever
20. Primer bulb
21. Chain brake / clutch cover
DESCRIPTION
1 216 4 5 6 7 10 11
141312
8-9
3 182120
19
15
17

7
ASSEMBLY
MOUNTING GUIDE BAR AND CHAIN
The unit is delivered with guide bar and saw chain
separated. Install guide bar and chain as follows:
WARNING. Do not start the engine until
the saw is fully assembled. Wear
protective gloves at all times when
handling the chain.
1. Unscrew the two bar fastening nuts situated
next to the chain tensioning screw. (Fig.1)
2. Remove clutch cover by pressing the back end
of the cover and pulling it off simultaneously.
3. Attach the bucking spikes to the front of the
saw body so the spikes point upward. (Fig.2)
4. Slip the bar under the edge of the clutch and
then over the mounting studs. (Fig.3-A)
Note the position of the tension adjusters hole
in the bar (Fig.3-B). This hole will need to be
lined up with the tension adjustment pin when
the clutch cover is refitted.
5. Lay the chain around the sprocket (Fig.4-A)
Check that the tangs of the chain links are
sitting correctly in the slots in the sprocket and
then lay the chain around the bar.
NOTE: The cutting edge of the chain must face
in the direction indicated. (Fig.4-C)
WARNING. Before using a new chain /
bar for the first time liberally lubricate the
chain and bar by hand using chain oil.
WARNING. Check that the
chain brake is released
before proceeding. The
clutch cover cannot be
removed until the chain
brake is released. Do this
by pulling the front hand guard towards the
choke lever - CHAIN BRAKE RELEASE
P SITI N.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
B
A
BA
C

8
ASSEMBLY
6. Align the chain tensioning pin and the hole in
the bar and then fit the clutch cover and bar
fastening nuts finger tight only.
7. Adjust the chain tension screw (Fig.5) so that if
the chain is pulled down with the fingers at the
centre of the bar the gap between the chain
and the bar is 2 to 3 mm. (Fig.6)
8. At this point double check to see if the chain is
sitting correctly on the sprocket and bar. Do not
proceed until they are sitting correctly. Firmly
tighten the bar fastening nuts.
WARNING. Saw chain stretches during
use, particularly when it is new, and it will
occasionally be necessary to adjust and
tighten it. New chain will require adjust
ment in less than 5 cuts. Re adjust it as
often as necessary.
CAUTION. For your own safety, always
stop the engine before performing any
adjustments. Always wear gloves when
working on the chain. Do not operate
with a loose chain.
Fig. 5
Fig. 6
2-3 mm
FUEL MIXING AND CHAIN LUBRICATION
FUEL AND LUBRICANT
• The fuel for this machine is a mixture of
unleaded petrol and an air-cooled 2-stroke oil
of a reputable brand name. Do not use fuel
containing methyl alcohol or more than 10%
ethyl alcohol.
• Recommended mixture ratio 25:1.
• Do not mix directly in the engine fuel tank. Mix
fuel with 2-stroke oil in an approved container,
shake gently and ensure a thorough mix, and
pour into the fuel tank. Any spilled fuel should
be wiped clean immediately.
• Do not store unused fuel for too long as the
petrol and oil mixture separates, causing
damage to the engine.
WARNING. Never use raw fuel with out
oil in your unit. This will cause permanent
engine damage and void the your
warranty for that product. Never use a
fuel mixture that has been stored for over
90 days.
WARNING. The 2 stroke oil must be a
premium grade oil for 2-cycle air cooled
engines and must be mixed at a 25:1
ratio with the fuel. Mixing the fuel at a
greater ratio than 25:1 provides
insufficient lubrication and will cause
engine damage and voids your engines
warranty.
WARNING. Handle petrol with care as it
is highly flammable.
CHAIN LUBRICANT
• Proper lubrication of the chain while in
operation reduces the friction between the
chain and the guide bar and assures a longer
tool life. Use only special chain oil of a high
quality for this purpose.
• Do not use any waste or reclaimed oil as this
could cause various problems with the oil
pump.
• Whenever you refill the fuel tank with petrol you
must also top up the level of chain oil in the
chain oil tank.

9
FUEL MIXING AND CHAIN LUBRICATION
SAW CHAIN / BAR LUBRICATION
Adequate lubrication of the saw chain is essential
at all times to minimize friction with the guide bar.
Never starve the bar and chain of oil. Running the
saw with too little oil will decrease cutting efficiency,
shorten saw chain life, cause rapid dulling of chain,
and cause excessive wear of bar from overheating.
Too little oil is evidenced by smoke, bar
discolouration or pitch build-up. New chains/bars
should be lubricated by hand before starting.
AUTOMATIC OILER
Your chain saw is equipped with an automatic oiler
system. The oiler automatically delivers the proper
amount of oil to the bar and chain. As the engine
speed increases, so does the oil flow to the bar
pad. The oil tank should be checked and topped up
each time the fuel tank is refilled.
Check the operation of the oil pump by running the
saw at a medium speed. There should be visible
spatters of oil coming from tip of the saw about 30
second after starting the saw.
WARNING. During normal operation the
chain brake, clutch cover, bar and chain
are lubricated with chain oil. After use oil
will drain for many weeks and pool on
the surface underneath the chainsaw.
Place the chainsaw on a protected
surface to contain the draining lubricating
oil when not being used.
CAUTION. Whenever opening up the
fuel tank, always loosen the cap very
slowly and wait for the tank pressure to
equalise before removing the cap
completely.
OPERATION
GETTING STARTED
Before starting check the operation to the chain
brake.
1. The chain brake lever (Fig.7-A) should click
between positions (B) and (C). Leave it in
position (C) for starting.
NOTE: The brake lever should snap into both
positions. If strong resistance is felt, or lever
does not move into either position, do not use
your saw. Take it immediately to a professional
Service Centre for repair.
2. Fill The fuel tank (Fig.8-A) with 25:1 fuel oil mix.
3. Fill The oil tank (Fig.8-B) with chain oil.
NOTE: Whenever you refill the fuel tank with
fuel you must also top up the level of chain oil
in the chain oil tank.
STARTING
1. Push the chain brake lever forward to engage
the chain brake. (Fig.9)
Fig. 8
Fig. 9
Fig. 7
A
BC
A
B

10
OPERATION
2. Pull the choke lever fully out. (Fig.10-A)
3. Press the primer bulb 3 to 5 times. (Fig.10-B)
4. Set the ignition swith to the “I” N position.
(Fig.11)
5. Place the saw on a firm and level surface. Hold
the saw securely with your foot as illustrated in
Fig.12. Pull the starter 3 to 5 times. Stop when
the engine tries to fire. Push the choke knob
back in (Fig.10-A) and then pull the starter
again several times until the motor starts.
6. When the motor starts let it idle of a couple of
seconds to warm up. Apply part throttle (Fig.13)
and maintain the unit at a low to Medium speed
for a further 10 seconds.
7. Disengage the chain brake by pulling back the
chain bake lever and bringing the motor to
cutting speed. (Fig.14)
STOPPING
1. To ST P the motor set the ignition switch
(Fig 15-A) to the “0” FF position.
NOTE. To stop the engine in an
emergency, activate the chain brake and
switch the ignition switch the “0” FF
position.
Fig. 10
Fig. 11
Fig. 12
Fig. 15
Fig. 13
Fig. 14
A
B
A
A
A

11
OPERATION
OPERATION
The following section on the operation of the chain
saw is a general guide only. The use of a chain saw
by an inexperienced person can be extremely
dangerous. If you are unsure, please seek the
assistance of a professional or get suitable training
before using the chain saw.
WARNING. Before every use check the
operation of the chain break and oil
pump.
BUCKING SPIKES
The chainsaw has bucking spikes (Fig.16-A) to as-
sist with cutting and reduce the chance of
kickback. Keep the bucking spikes touching the
wood when cutting will help prevent any pinching or
kick-back.
BUCKING
Bucking is cutting a log into lengths for easier
handling. To saw a log lying on the ground, first
saw halfway, then roll the log over and cut from the
opposite side (Fig.17). To saw the end of a log
supported off the ground, first saw up from the
bottom one-third through the log then finish by
sawing down from the top. To saw a log in the
middle of two supports holding it off the ground,
first saw down from the top one-third through the
log then finish by sawing up from the bottom
(Fig.18).When bucking on a slope, always stand on
the uphill side.
WARNING. Be careful that the chain
does not cut into the ground when
bucking as this causes rapid dulling of
the chain.
LIMBING
Limbing is the process of removing the branches
from a fallen tree. Check the direction in which a
branch will bend before cutting it. Always cut on the
opposite side to the bending direction so that the
guide bar is not pinched in the cut. For large limbs
that cannot be removed in one cut, make an initial
cut from the bent side and finish by sawing from
the opposite direction (Fig.19). Do not remove
limbs that are supporting the fallen tree on the
ground until the tree has been cut into lengths.
WARNING. Always keep a well balanced
stance. Do not stand on the log. Be alert
to the fact that the log may roll over.
When working on a slope, always stand
on the uphill side of the log.
Fig. 16
Fig. 17
Fig. 18
Fig. 19
A

OPERATION
PRUNING
Pruning is the removal of a limb or branch from a
standing tree.
WARNING. Do not use an unstable
foothold or ladder. Do not overreach. Do
not saw above shoulder height. Always
use both hands to hold the saw. First cut
up from the bottom and finish down from
the top.
FELLING
Felling is the term for cutting down a tree. Small
trees up to 6-7 inches (15-18cm) in diameter are
usually cut in a single cut. Larger trees require
notch cuts. Notch cuts determine the direction the
tree will fall.
WARNING. Do NOT fell trees unless you
have received the appropriate training.
A retreat path (Fig.21- A) should be
planned and cleared as necessary
before cuts are started. The retreat path
should extend back and diagonally to the
rear of the expected line of fall, as
illustrated.
NOTE: Direction of fall (Fig.21-B) is
controlled by the notching cut. Before
any cuts are made, consider the location
of larger branches and natural lean of
the tree to determine the way the tree
will fall.
GENERAL GUIDELINES FOR FELLING TREES
Normally felling consists of 2 main cutting opera-
tions, notching (Fig.22-C) and making the felling
cut (Fig.22-D).
Start making the upper notch cut (Fig.22-C) on the
side of the tree facing the felling direction
(Fig.22-E).
Be sure you don’t make the lower cut too deep in-
to the trunk.
The notch (Fig.22-C) should be deep enough to
create a hinge (Fig.22-F) of sufficient width and
strength. The notch should be wide enough to
direct the fall of the tree for as long as possible.
Fig. 20
Fig. 21
Fig. 22
12

OPERATION
Use wooden or plastic wedges (Fig .23-A) to
prevent pinching the bar and chain (Fig.23-B) in the
cut. Wedges also control felling.
When diameter of wood being cut is greater than
the bar length, make 2 cuts as shown (Fig 24).
WARNING. Before making the final cut,
always recheck the area for bystanders,
animals or obstacles.
WARNING: Never saw completely
through the trunk. Always leave a hinge
(Fig.22-F). The hinge guides the tree. If
the trunk is completely cut through,
control over the felling direction is lost.
Insert a wedge or felling lever in the cut
well before the tree becomes unstable
and starts to move. This will prevent the
bar from binding in the felling cut if you
have misjudged the falling direction.
Make sure no bystanders have entered
the range of the falling tree before you
push it over.
WARNING: As the felling cut gets close
to the hinge, the tree should begin to fall.
When tree begins to fall, remove saw
from cut, stop engine, put chain saw
down, and leave area along retreat path
(Fig 17-A).
Fig. 23
Fig. 24
13
MAINTENANCE
WARNING. All maintenance work on the
chainsaw apart from the work described
in this manual may only be carried out by
authorised after-sales service personnel.
• Do not make any adjustments while the motor
is in motion.
• Do not modify the chain saw as this could
jeopardise your safety and will make the
warranty null and void.
• Check the chain saw for damage. Any
damaged safety devices and parts must be
repaired or replaced immediately.
• After use, check your tool to keep it in top
condition.
• Keep the cooling vents on the motor housing
clean and unobstructed at all times. Clean out
accumulated dust.
Regularly check for obvious defects such as loose,
dislodged or damaged cutting device, loose fixings
and worn or damaged components.
Check that covers and guards are undamaged and
correctly fitted. Carry out necessary maintenance
or repairs before using the product.
Spark plug Check every 25 hours
Spark plug Clean every 25 hours
Spark plug Replace whenever necessary
Air filter Check before/after each use
Air filter Clean every 10 hours
Air filter Replace whenever necessary
Cutting device Check before/after each use
Cutting device Lubricate before/after each use
Cutting device Clean before/after each use
Cutting device Replace whenever necessary
Valve play Check 100 hours/once a year

MAINTENANCE
CHAIN BRAKE OPERATIONAL TEST
Test the chain brake periodically to ensure proper
function. Perform a chain brake test prior to initial
cutting, following extensive cutting, and definitely
following any Chain brake service.
1. Place saw on a clear, firm, flat surface.
2. Start engine.
3. Grasp the rear handle (Fig.25-A) with your right
hand.
4. With your left hand, hold the front handle
(Fig 25-B) [not chain brake lever (Fig.25-C)]
firmly.
5. Squeeze the throttle trigger to 1/3 throttle, then
immediately activate the chain brake lever
(Fig.25-C).
6. Chain should stop abruptly. When it does,
immediately release the throttle trigger.
7. If chain brake functions properly, turn the
engine off and return the chain brake to the
DISENGAGED position.
WARNING. If chain does not stop, turn
engine off and take your unit to the
nearest authorised service centre for
service.
AIR FILTER
Do not operate saw without the air filter. Dust and
dirt will be drawn into engine and damage it. The
air filter must be cleaned after 20 hours of service.
CLEANING THE AIR FILTER (FIG.26-C)
Remove the top cover by undoing the cover
fastening screw on the cover. You can then remove
the cover.
Lift out the air filter and wash filter in clean, warm,
soapy water. Rinse in clear, cool water. Air dry
completely.
Refit the filter, fit the cover for the engine/air filter.
Make sure that the cover fits perfectly when you do
so. Tighten the fastening screw for the cover.
SPARK PLUG (FIG.26-D)
To ensure that the saw’s engine retains its power,
the spark plug must be clean and have the correct
electrode gap (0.6 mm). The spark plug must be
cleaned or replaced after every 20 hours of service.
Set the On/Off switch to Stop (0).
Remove the top cover by undoing the fastening
screw on the cover. You can then remove the
cover.
Disconnect the ignition cable from the spark plug
by pulling and twisting it simultaneously. Remove
the spark plug using a spark plug wrench. DO NOT
USE ANY OTHER TOOLS. Clean the spark plug
with a copper wire brush or fit a new one.
CARBURETTOR SETTING
The carburettor has been factory set. If it requires
adjusting, take the saw to your nearest authorized
after-sales service outlet.
CHAIN BAR
Turning the chain bar. The bar should be reversed
every 8 working hours to ensure uniform wear.
Keep the bar groove and lubrication hole clean.
Check the bar rails frequently for wear and, if
necessary, remove the bars and square-up the rails
using the flat file.
WARNING. Never fit a new chain to a
worn chain bar.
SPROCKET
This sprocket is subjected to especially high wear
and tear. If you notice deep wear marks on the
teeth, the sprocket must be replaced. A worn
sprocket curtails the service life of the chain saw.
Have the sprocket replaced by an authorised
service centre.
Fig. 25
Fig. 26
14
D
C
C
B
A

15
MAINTENANCE
SHARPENING THE CHAIN SAW
WARNING. We advise you to have deep
or important sharpening carried out by a
service agent who is equipped with an
electric sharpener.
When the chain penetrates into wood with difficulty,
it needs to be sharpened as follows:
1. Put the chain under tension.
2. Fasten the bar in a vice so that the chain can
slide (Fig.27)
3. File with forward strokes only until all the worn
out parts of the cutting edge is removed.
4. Count the number of strokes given to the cutter
as a reference basis and file away the same
number of strokes on all other cutters.
5. If after sharpening a few times, the depth
gauge protrudes from the template, you must
reset its level using a flat file. (Fig.28)
6. Finally round off the depth gauge. (Fig.29)
GUIDE BAR
The guide bar is subjected to especially severe
wear and tear at the nose and the bottom. To avoid
one-sided wear and tear, turn the guide bar over
every time you sharpen the chain.
1. When you have finished working, clean out the
groove and the oil passages, with a special
scraping hook. (Fig.30).
2. Periodically trim the sides of the rails using a
flat file. If not done in the long run the
“feathered edges” might break away and
damage the bar. (Fig.31)
Fig. 28
Fig. 29
Fig. 30
Fig. 31
Fig. 27

16
MAINTENANCE
3. If one rail is higher than the other one, it is
necessary to make it even with a flat file and
then smooth them with a file or fine grain
abrasive paper. (Fig.32)
CHAIN TENSION
Check the chain tension frequently and adjust as
often as necessary to keep the chain snug on the
bar, if the chain is pulled down with the fingers at
the centre of the bar the gap between the chain
and the bar should be 2 to 3mm.
NEW CHAINS
A new chain will need to be readjusted after as few
as 5 cuts. This is normal during the break in period,
future adjustments will be required less often.
OIL PASSAGES
il passages on the bar should be cleaned to
ensure proper lubrication of the bar and chain
during operation.
NOTE. The condition of the oil passages can be
easily checked. If the passages are clear, the chain
will automatically give off a spray of oil within
seconds of starting the saw. Your saw is equipped
with an automatic oiler system.
Fig. 32
STORAGE
Never put a chain saw into storage for longer than
30 days without carrying out the following steps.
• Remove the fuel tank cap slowly to release any
pressure in tank.
• Carefully drain the fuel tank.
• Start the engine and let it run until the unit
stops to remove fuel from carburettor.
• Allow the engine to cool (approx. 5 minutes).
WARNING. During normal operation the
chain brake, clutch cover, bar and chain
are lubricated with chain oil. After use oil
will drain for many weeks and pool on
the surface underneath the chainsaw.
Place the chainsaw on a protected
surface to contain the draining lubricating
oil when not being used.
RETURNING THE SAW BACK INTO OPERATION
• Remove spark plug.
• Clean the spark plug and check that the
electrode gap is correct.
• Fill fuel tank with proper fuel / oil mixture.
• Fill the chain oil tank.
SER ICE
Now that you have purchased your tool, should a need ever exist of repair or service, simply contact your
nearest Ryobi Authorised Service Centre or other qualified service organistion. Be sure to provide all
pertinent facts when you call or visit.

17
MAINTENANCE
petrol
petrol

18
NOTES

19
NOTES