Ryobi RCS3845 User manual

ORIGINAL INSTRUCTIONS
Petrol Chainsaw
RCS3845

Important!
It is essential that you read the instructions in this manual before assembling,
operating, and maintaining the product.
Subject to technical modification.

1
Safety, performance, and dependability have been given
top priority in the design of your petrol chainsaw.
INTENDED USE
The petrol chainsaw is only intended for use outdoors in a
well-ventilated area. For safety reasons, the product must
be adequately controlled by using two-handed operation at
all times.
The product is designed for cutting branches, trunks, logs,
and beams of a diameter determined by the cutting length
of the guide bar. It is only designed to cut wood. It is only
to be used in domestic application by adults who have
received adequate training on the hazards and preventative
measures/actions to be taken while using the product.
The product is not to be used by children or by persons
not wearing adequate personal protective equipment and
clothing. It is also not to be used for professional tree
services.
Do not use the product for any other purpose.
WARNING
When using the product, the safety rules must be
followed. For your own safety and that of bystanders,
you must read and fully understand these instructions
before operating the product. You should attend
a professionally organised course on the use and
maintenance of chainsaws, preventative actions, and
rst aid. Please keep these instructions safe for later
use.
WARNING
Chainsaws are potentially dangerous tools. Accidents
involving the use of chainsaws often result in loss of
limbs or death. It is not just the product that is the hazard.
Falling branches, toppling trees, rolling logs can all kill.
Diseased or rotting timber poses additional hazards.
You should assess your capability of completing the task
safely. If there is any doubt, leave it to a professional
tree surgeon.
GENERAL SAFETY WARNINGS
■Some regions have regulations that restrict the use of
the product. Check with your local authority for advice.
■Never allow children or people unfamiliar with the
instructions to use the product. Local regulations may
restrict the age of the operator.
■Ensure before each use that all controls and safety
devices function correctly. Do not use the product if the
“off” switch does not stop the engine.
■Never start or run the engine in a closed or poorly
ventilated area, breathing exhaust fumes can kill.
■Clear the work area before each use, a cluttered and
untidy work area leads to accidents.
■Wear full eye and hearing protection, strong sturdy
gloves, safety boots with non-slip soles as well as head
protection while using the product. Use a face mask if
operation is dusty.
■Do not wear loose fitting clothing, short trousers or
jewellery of any kind.
■Secure long hair so it is above shoulder level to prevent
entanglement in moving parts.
■Beware of thrown, flying, or falling objects. Keep all
bystanders, children, and animals at least 15 m away
from work area.
■Never use the product in an explosive or flammable
atmosphere.
■Maintain a firm grip on both handles while using the
product.
■Stay alert, watch what you are doing, and use common
sense when using the product. Do not use the product
while tired, ill, or under the influence of drugs, alcohol,
or medication. A lapse in concentration while using the
product may result in severe personal injury.
■Do not use in poor lighting. The operator requires a
clear view of the work area to identify potential hazards.
■Use of hearing protection reduces the ability to hear
warnings (shouts or alarms). The operator must pay
extra attention to what is going on in the work area.
■Operating similar tools nearby increases both the risk
of hearing injury and the potential for other persons to
enter your work area.
■Keep firm footing and balance. Do not overreach.
Overreaching can result in loss of balance or exposure
to hot surfaces and can increase the risk of kickback.
■Keep all parts of your body away from any moving part.
■Do not touch the area around the silencer or engine of
the product; these parts get very hot during operation.
■Inspect the product before each use. Check for correct
operation of all controls including the chain brake.
Check for loose fasteners, fuel leaks, etc. Make sure all
guards and handles are properly and securely attached.
Replace any damaged parts before use.
■Do not modify the product in any way or use parts
and accessories that are not recommended by the
manufacturer.
WARNING
If the product is dropped, suffers heavy impact, or begins
to vibrate abnormally, immediately stop the product and
inspect for damage or identify the cause of the vibration.
Any damage should be properly repaired or replaced by
an authorised service centre.
■When mixing fuel or filling fuel tank, do not smoke and
keep 10 m away from any source of ignition.
■Mix and store fuel only in a container approved for fuel.
■Mix fuel outdoors where there are no sparks or flames.
Wipe up any fuel spillage. Move 10 m away from
refuelling site before starting engine.
■Stop the engine and allow it to cool down before
refuelling, storing, or transporting the product.
■Remember to properly close all fuel tank/container caps
after refuelling or mixing.

2
CHAINSAW SAFETY WARNINGS
■Always fit the guide bar cover when the product is not in
use or being carried or transported. This will help reduce
the risk of accidental contact with the sharp blades on
the chain. Carry the product by the top handle with the
guide bar facing away from your body.
■You should get used to your new product by making
simple cuts on securely supported wood. Do this
whenever you have not operated the product for some
time.
■It is recommended to cut logs on a saw-horse or cradle
when operating the product for the first time.
■Ensure all the guards, handles, and spiked bumper are
properly fitted and are in good condition.
■Persons using the product should be in good health.
The product is heavy, so the operator must be
physically fit. The operator should be alert, have good
vision, mobility, balance, and manual dexterity. If there
is any doubt, do not operate the product.
■Do not stand on any unstable surface while using
the product. This could include, but is not limited, to
ladders, scaffolds, and trees. Keep both hands on the
handles of the product at all times.
■Do not start using the product until you have a clear
work area, secure footing, and a planned retreat path
away from the falling tree.
■Use extreme caution when cutting small-size branches
and sapling because slender material may catch the
saw chain and be whipped toward you or pull you off
balance.
■When cutting a limb under tension, be alert for spring
back so that you will not be struck when the tension in
the wood fibres is released.
■Beware of the emission of exhaust gases, lubricant
mist, and saw dust. Wear a mask or respirator, if
required.
■Do not cut vines and/or small undergrowth (less than
75 mm in diameter).
■Always hold the chainsaw with both hands during
operation. Use a firm grip with thumbs and fingers
encircling the chainsaw handles. Right hand must be
on the rear handle and left hand on the front handle.
■Before starting the engine, make sure the saw chain is
not contacting any object. Always start the product with
the chain brake applied (pushed fully forward).
■Do not modify the product in any way or use it to power
any attachments or devices not recommended by the
manufacturer of the product.
■There should be a first-aid kit containing large wound
dressings and a means to summon attention (e.g.,
whistle) close to the operator. A larger and more
comprehensive kit should be reasonably nearby.
■Wear a helmet at all times when operating the product.
A helmet, equipped with mesh visor, can help reduce
the risk of injury to the face and the head if kickback
occurs.
■The operator may be tempted to remove the helmet if
there is no danger of falling objects in the work area, but
the helmet, particularly with the mesh visor, can help
reduce the potential for injury to the face and head if
kickback occurs.
■An incorrectly tensioned chain can jump off the guide
bar and could result in serious injury or fatality. The
length of the chain depends on the temperature of the
chain and chain wear. Check the tension frequently.
■Keep handles dry, clean, and free from oil and grease.
Greasy and oily handles are slippery, causing loss of
control.
■To reduce the risk of injury associated with contacting
moving parts, always stop the engine and engage the
chain brake. Make sure all moving parts have come to
a complete stop:
●before leaving the product unattended
●before cleaning or clearing a blockage
●before installing or removing attachments
●before checking, conducting maintenance, or
working on the product
■The size of the work area depends on the job being
performed as well as the size of the tree or work piece
involved. For example, felling a tree requires a larger
work area than making other cuts, i.e., bucking cuts.
The operator needs to be aware and in control of
everything happening in the work area.
■Do not cut with your body in line with the guide bar and
chain. If you experience kickback, this will help prevent
the chain from coming into contact with your head or
body.
■Do not use a back-and-forward sawing motion; let the
chain do the work. Keep the chain sharp, and do not try
to push the chain through the cut.
■Do not put pressure on the saw at the end of the cut.
Be ready to take on the weight of the saw as it cuts free
from the wood. Failure to do so could result in possible
serious personal injury.
■Do not stop the saw in the middle of a cutting operation.
Keep the saw running until it exits.
Personal protective equipment
Good quality personal protective equipment, as used
by professionals, will help reduce the risk of injury to
the operator. The following items should be used when
operating the product:
■Safety helmet
■Hearing protection
■Eye and face protection
■Gloves
■Leg protection (chaps)
■Chainsaw safety boots
■Chainsaw jackets for upper body protection
ASSEMBLY
WARNING
If any parts are damaged or missing, do not operate the
product until the parts are replaced. Failure to heed this
warning could result in serious personal injury.

3
ADJUSTING THE CHAIN TENSION
See page 27.
1. Stop the engine. Wear protective gloves. Disengage
the chain brake.
2. Make sure the bar mounting nuts are loosened to
finger-tight.
3. To increase the chain tension, turn the chain tensioning
screw clockwise and check the chain tension frequently.
To reduce the chain tension, turn the chain tensioning
screw counterclockwise and check the chain tension
frequently.
Tighten the bar mounting nuts by turning them clockwise
to 11 ~ 13 Nm (Turn the nut 180° or 3 flats past finger
tight). Do not overtighten.
NOTE: The chain tension is correct when the gap between
the cutter in the chain and the bar is about 3 - 4 mm. Pull the
chain in the middle of the lower side of the bar downwards
(away from the bar) and measure the distance between the
bar and the chain cutters.
NOTE: The temperature of the chain increases during
normal operation causing the chain to stretch. Check the
chain tension frequently and adjust as required. A chain
tensioned while warm may be too tight upon cooling. Make
sure that the chain tension is correctly adjusted as specied
in these instructions.
OPERATION
FUEL AND REFUELLING
Handling the fuel safely
WARNING
Always shut off engine before fuelling. Never add fuel to
a machine with a running or hot engine. Move at least
10 metres from refuelling site before starting the engine.
Do not smoke! Failure to heed this warning can result in
possible personal injury.
WARNING
Check for fuel leaks. If any are found, correct them
before using the product to prevent fire or burn injury.
■Always handle fuel with care; it is highly flammable.
■Always refuel outdoors away from potential sources of
ignition, do not inhale fuel vapours.
■Do not let petrol or lubricant come in contact with skin.
If contact does occur wash immediately with soap and
plenty of water.
■Keep petrol and lubricant away from the eyes. If petrol
or lubricant comes in contact with the eyes, wash them
immediately with clean water. If irritation is still present,
see a physician immediately.
Mixing the fuel
■The product is powered by a 2-cycle engine and
requires pre-mixing petrol and 2-cycle lubricant. Pre-
mix unleaded petrol and 2-cycle engine lubricant in a
clean container approved for petrol.
■The engine is certified to operate on unleaded petrol
intended for automotive use with an octane rating of 91
or higher.
■Do not use any type of pre-mixed petrol/lubricant from
fuel service stations; this includes the pre-mixed petrol/
lubricant intended for use in mopeds and motorcycles.
■Use a high quality 2-cycle self-mixing lubricant for air-
cooled engines. Do not use automotive lubricant or
2-cycle outboard lubricant.
■Mix 2% lubricant into the petrol. This is a 50:1 ratio.
■Mix the fuel thoroughly and each time before fuelling.
■Mix in small quantities. Do not mix quantities larger
than usable in a 30-day period. A 2-cycle lubricant
containing a fuel stabiliser is recommended.
NOTE: Fuel system damage or performance problems
resulting from the use of an oxygenated fuel containing
more than the percentages of oxygenates stated previously
are not covered under warranty.
Filling the fuel tank
See page 14.
■Clean the surface around the fuel cap to prevent
contamination.
1. Loosen the fuel cap by turning it counterclockwise.
2. Lift the fuel cap and set aside.
3. Carefully pour the fuel mixture into the tank. Avoid
spillage. Prior to replacing the fuel cap, clean and
inspect the gasket. Immediately replace the fuel cap
and hand tighten it. Wipe away any fuel spillage.
NOTE: It is normal for the engine to emit smoke during and
after the rst use.
ADDING CHAIN LUBRICATING OIL
See page 15.
WARNING
Never work without chain lubricant. If the saw chain is
running without lubricant, guide bar and saw chain can
be damaged. It is therefore essential to check the oil
level frequently and every time before starting to use the
product.
■Clear surface around the oil tank cap to prevent
contamination.
1. Unscrew and remove the oil tank cap from the oil tank.
2. Lift the oil tank cap and set aside.
3. Pour the oil into the oil tank and monitor the oil level
gauge. Ensure that no dirt enters the oil tank while
filling. Put the oil tank cap back on and tighten. Wipe
away any spillage.
■One full oil tank will enable you to use the product for
20 - 40 min.
NOTE: A properly functioning chain and bar lubricating
system will normally discharge oil from the chain during
use. To check the functionality of the chain and bar
lubricating system, point the tip of the chain at a light
coloured surface, such as a newspaper. While the product
is operating, a distinct line of oil splatter should be observed

4
after a short time.
Recommended chain lubricating oil
■The manufacturer recommends you use only RYOBI
chainsaw lubricating oil. (Available from your authorised
service centre)
STARTING THE PRODUCT
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 product on level ground with the starter
grip facing the operator 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:
See page 14 - 15.
1. Engage the chain brake by pushing the front hand
guard/chain brake forward.
2. Fully press and release the primer bulb at least 10
times.
3. Pull the choke lever all the way out to the full-choke
position.
4. When the temperature is above 10°C, pull the starter
grip until the engine attempts to start, but no more than
3 times. When the temperature is below 10°C, pull the
starter grip until the engine attempts to start, but no
more than 5 times.
5. Push the choke lever to the half-choke position.
6. Pull the starter grip until engine starts.
7. Depress the trigger release and squeeze the throttle
trigger, then release the throttle trigger to return the
engine to idle.
8. Allow the product to run idle for 15 - 30 seconds.
9. Before accelerating the engine or cutting wood, make
sure the chain brake is disengaged by pulling the front
hand guard/chain brake back.
CAUTION
Failure to fully release the throttle when chain brake lever
is in the brake position will result in serious damage to
the product. Never squeeze and hold the throttle trigger
while the chain brake is in the brake position.
To start a warm engine:
See page 23 - 24.
1. Engage the chain brake.
2. Pull the choke lever all the way out to the full-choke
position.
3. Push the choke lever to the half-choke position.
4. Pull starter grip until engine runs, but no more than 5
times.
5. Depress the trigger release and squeeze the throttle
trigger, then release the throttle trigger to return the
engine to idle. If engine does not start after 5 pulls, use
cold engine starting procedure.
6. Before accelerating the engine or cutting wood, make
sure the chain brake is disengaged by pulling the front
hand guard/chain brake back.
STOPPING THE ENGINE
Release the throttle trigger and let the engine return to idle.
To stop the engine, fully press the stop switch. Do not put
the product on the ground when the chain is still moving.
For additional safety, set the chain brake when the product
is not in use.
In the event that the ignition switch will not stop the product,
pull the choke lever out to the fully extended position (full-
choke) and engage the chain brake to stop the engine. If
the ignition switch will not stop the product when "STOP" is
fully pressed, have the ignition switch repaired before using
the product again to prevent unsafe conditions or serious
injury.
NOTE: When you are nished using the product, always
relieve tank pressure by loosening, then retightening, the
chain lubricant and fuel caps. Allow the engine to cool
down before storing.
HOLDING THE PRODUCT
See page 19.
Always hold the product with your right hand on the rear
handle and your left hand on the front handle. Grip both
handles with the thumbs and ngers encircling the handles.
Ensure that your left hand is holding the front handle so that
your thumb is underneath.
CHECKING AND OPERATING THE CHAIN BRAKE
1. Engage the chain brake by rotating your left hand
around the front handle. Allow the back of your hand to
push the chain brake lever/hand guard toward the bar
while the chain is rotating rapidly. The chain should stop
rotating immediately. Be sure to maintain both hands on
the handles of the product at all times.
2. Reset the chain brake back into the run position 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, have the product serviced by an authorised
service centre only prior to use.

5
WARNING
When the throttle trigger is released and the engine is
running at idle speed, the saw chain must not move. If
it does continue to move there is risk of severe injury to
the operator. Do not use the product, have the product
serviced by an authorised service centre only.
CHECKING THE CLUTCH
1. Disengage the chain brake by pulling the chain brake
lever/hand guard towards the front handle until a click
is heard.
2. Allow the engine to run idle. Ensure that the saw chain
is not rotating. If the saw chain rotates while running at
idle speed, the clutch may be damaged. Do not use the
product. Have the product serviced by an authorised
service centre only.
3. Depress the throttle trigger half-way and run the product
at mid speed. The saw chain should rotate smoothly if
the clutch is in good working condition.
RESTARTING AFTER EXTENDED PERIODS OF HEAVY
USE
After using the chain saw for extended periods of time,
please let the product run in idle, with the chain brake
engaged for 3 to 5 minutes, allowing accumulated heat
of the engine to dissipate through the forced-air cooling
system.
This helps prevent a potential heat soak and thus potential
high stress of certain engine components (i.e. ignition
system and carburettor).
After complete shut-off of the engine you may experience
difculties restarting the chainsaw due to this condition,
which is completely normal. Allow the product to cool down
before restarting.
Causes and operator prevention of kickback:
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 sudden reverse
reaction, kicking the guide bar up and back towards the
operator.
Pinching the saw chain along the top of the guide bar may
push the guide bar rapidly back towards 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 your
saw. As a chainsaw user, you should take several steps to
keep your cutting jobs free from accident or injury.
Kickback is the result of tool misuse and/or incorrect
operating procedures or conditions and can be avoided by
taking proper precautions as given below:
■Maintain a firm grip, with thumbs and fingers
encircling the chainsaw handles, with both hands
on the saw with your body and arms positioned to
allow you to resist kickback forces. Kickback forces
can be controlled by the operator, if proper precautions
are taken. Do not let go of the chainsaw.
■Do not overreach and do not cut above shoulder
height. This helps prevent unintended tip contact and
enables better control of the chainsaw in unexpected
situations.
■Only use replacement bars and chains specified
by the manufacturer. Incorrect replacement bars and
chains may cause chain breakage and/or kickback.
■Follow the manufacturer’s maintenance
instructions for the saw chain. Decreasing the depth
gauge height can lead to increased kickback.
INSTRUCTIONS CONCERNING THE PROPER
TECHNIQUES FOR BASIC FELLING, LIMBING, AND
CROSS-CUTTING
Understanding the forces within the wood
When you understand the directional pressures and
stresses inside the wood, you can reduce the “pinches”
or at least expect them during your cutting. Tension in the
wood means the bers are being pulled apart and if you
cut in this area, the “kerf” or cut will tend to open as the
saw goes through. If a log is being supported on a saw
horse and the end is hanging unsupported over the end,
tension is created on the upper surface due to the weight
of the overhanging log stretching the bers. Likewise, the
underside of the log will be in compression and the bers
are being pushed together. If a cut is made in this area, the
kerf will have the tendency to close up during the cut. This
would pinch the blade.
Felling a tree
See page 19 - 20.
When bucking and felling operations are being performed
by two or more persons at the same time, the felling
operations should be separated from the bucking operation
by a distance of at least twice the height of the tree being
felled. Trees should not be felled in a manner that would
endanger any person, strike any utility line or cause any
property damage. If the tree does make contact with any
utility line, the company should be notied immediately.
The chainsaw operator should keep on the uphill side of
the terrain as the tree is likely to roll or slide downhill after
it is felled.
An escape path should be planned and cleared as
necessary before cuts are started. The escape path should
extend back and diagonally to the rear of the expected line
of fall.
Before felling starts, consider the natural lean of the tree,
the location of larger branches and the wind direction to
judge which way the tree will fall.
Remove dirt, stones, loose bark, nails, staples and wire
from the tree.
Do not attempt to fell trees which are rotten or have been
damaged by wind, re, lightning, etc. This is extremely
dangerous and should only be completed by professional
tree surgeons.
■Notching undercut
See page 19 - 20.
Make the notch 1/3 the diameter of the tree,
perpendicular to the direction of the fall. Make the
lower horizontal notching cut first. This will help to avoid
pinching either the saw chain or the guide bar when the
second notch is being made.

6
■Felling back cut
See page 19 - 20.
Make the felling back cut at least 5 cm. / 2 in. higher
than the horizontal notching cut. Keep the felling back
cut parallel to the horizontal notching cut. Make the
felling back cut so enough wood is left to act as a hinge.
The hinge wood keeps the tree from twisting and falling
in the wrong direction. Do not cut through the hinge.
As the felling gets close to the hinge, the tree should
begin to fall. If there is any chance that the tree may
not fall in desired direction or it may rock back and
bind the saw chain, stop cutting before the felling back
cut is complete and use wedges of wood, plastic or
aluminium to open the cut and drop the tree along the
desired line of fall.
When the tree begins to fall, remove the chainsaw
from the cut, stop the engine, put the chainsaw down,
and use the retreat path planned. Be alert for falling
overhead limbs and watch your footing.
Removing buttress roots
See page 20.
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
rst, followed by the vertical cut. Remove the resulting
loose section from the work area. Follow the correct tree
felling procedure after you have removed the large buttress
roots.
Push and pull
See page 21.
The reaction force is always opposite to the direction the
chain is moving. Therefore, the operator must be ready to
control the tendency for the product to pull away (forward
motion) when cutting on the bottom edge of the bar. Always
engage firmly the bumper spike to limit such movement.
The product can be pushed backwards (towards the
operator) when cutting along the top edge. To avoid this
make sure the chain is not jammed when cutting along the
top edge.
Saw jammed in the cut
Stop the chainsaw and make it safe. Do not try to force the
chain and bar out of the cut as this is likely to break the
chain, which may swing back and strike the operator. This
situation normally occurs because the wood is incorrectly
supported which forces the cut to close under compression,
thereby pinching the blade. If adjusting the support does
not release the bar and chain, use wooden wedges or a
lever to open the cut and release the saw. Never try to start
the chainsaw when the guide bar is already in a cut or kerf.
Skating / Bouncing
When the chainsaw fails to dig in during a cut, the guide
bar can begin hopping or dangerously skidding along the
surface of the log or branch, possibly resulting in the loss
of control of the chainsaw. To prevent or reduce skating or
bouncing, always use the saw with both hands. Make sure
the saw chain establishes a groove for cutting.
Never cut small, exible branches or brushes with your
chainsaw. Their size and exibility can easily cause the
saw to bounce towards you or bind up with enough force
to cause a kickback. The best tool for that kind of work is
a hand saw, pruning shears, an axe or other appropriate
hand tools.
Bucking a log
See page 21.
Bucking is cutting a log into lengths. It is important to
make sure your footing is rm and your weight is evenly
distributed on both feet. When possible, the log should be
raised and supported by the use of limbs, logs or chocks.
Follow the simple directions for easy cutting. When the log
is supported along its entire length, it is cut from the top
(overbuck).
When the log is supported on one end, cut 1/3 the diameter
from the underside (underbuck). Then make the nished
cut by overbucking to meet the rst cut.
When the log is supported on both ends, cut 1/3 the
diameter from the top (overbuck). Then make the nished
cut by underbucking the lower 2/3 to meet the rst cut.
When bucking on a slope, always stand on the uphill side of
the log. To maintain control when “cutting through”, release
the cutting pressure near the end of the cut without relaxing
your grip on the chainsaw handles. Don’t let the chain
contact the ground. After completing the cut, wait for the
saw chain to stop before you move the chainsaw. Always
stop the engine before moving from tree to tree.
Limbing a tree
See page 22.
Limbing is removing the branches from a fallen tree. When
limbing leave larger lower limbs to support the log off the
ground. Remove the small limbs in one cut. Branches
under tension should be cut from the bottom up to avoid
binding the product.
Springpoles
See page 22.
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. Do not attempt to cut
bent branches or stumps which are under tension unless
you are professionally trained and competent to do so.
TRANSPORTATION AND STORAGE
■Stop the engine and engage the chain brake. Allow the
product to cool down before storing or transporting.
■Clean all foreign material from the product.
■Drain all fuel from tank into a container approved for
petrol. Remember to properly replace and tighten the
fuel mix cap.
■Run the engine until it stops. This will remove all fuel-
lubricant mix that could become stale and leave varnish
and gum in the fuel system.
■Drain all bar and chain lubricant from tank into a
container approved for lubricant. Remember to properly

7
replace and tighten the chain lubricant cap.
■Always fit guide bar cover before storing the product, or
during transportation.
■Store the product in a cool, dry, and well-ventilated
place that is inaccessible to children. Keep away from
corrosive agents such as garden chemicals and de-
icing salts. Do not store outdoors.
■When carrying the product for a short distance (from
one working area to the next), always apply the chain
brake so that the saw chain is restricted from movement.
■When transporting the product, secure it against
movement or falling to prevent injury to persons or
damage to the product.
■Never carry or transport the product while the engine
is running.
■Abide by all government and local regulations for the
safe storage and handling of petrol. Excess fuel should
be used in other 2-cycle engine powered equipment.
MAINTENANCE
Always keep the product in good working condition.
WARNING
Use only original manufacturer’s replacement parts,
accessories, and attachments. Failure to do so can
cause possible injury, poor performance and may void
your warranty.
WARNING
Servicing requires extreme care and knowledge
and should be performed only by a qualied service
technician. For servicing and repairs, have the product
serviced by an authorised service centre only. When
servicing, use only original replacement parts.
WARNING
Before inspecting, cleaning, or servicing the product,
stop the engine and engage the chain brake. Failure to
follow these instructions can result in serious personal
injury or property damage.
■You may only make adjustments or repairs described
in this manual. For other repairs, contact the authorised
service centre.
■Consequences of improper maintenance, removal, or
modification of safety features like the chain brake,
ignition switch, hand guard (front and back), spiked
bumper, chain catcher, guide bar, low kick-back saw
chain may cause the safety features to not function
correctly, thus increasing the potential for serious injury.
Keep the product professionally maintained and safe.
■Sharpening the chain safely is a skilled task. Therefore,
the manufacturer strongly recommends that a worn or
dull chain is replaced with a new one, available at your
authorised service centre. The part number is available
in the product specification table in this manual.
■Follow instructions for lubricating and chain tension
checking and adjustment.
■After each use, clean the product with a soft dry cloth.
■Check all nuts, bolts, and screws at frequent intervals
for security to ensure the product is in safe working
condition. Any part that is damaged should be properly
repaired or replaced by an authorised service centre.
WARNING
Never run the engine without the air lter. Make sure the
air lter is correctly placed in the air lter cover before
reassembly.
INSPECTING AND CLEANING THE CHAIN BRAKE
See page 31.
■Always keep the chain brake mechanism clean by
lightly brushing the linkage free from dirt.
■Always test the chain brake performance after cleaning.
■Refer to “Operation - Checking and Operating Chain
Brake” section in this manual for additional information.
ENGINE SPEED AND CARBURETTOR ADJUSTMENT
WARNING
Incorrect carburettor adjustment may increase the risk
of injuries, fatal accidents, or product damage. For
carburettor adjustment, have the product serviced by an
authorised service centre only.
MAINTENANCE SCHEDULE
Daily check
Fuel mixture Before each use
Bar lubrication Before each use
Chain tension Before each use
and frequently
Clutch engagement
(no chain movement at idling
speed)
Before each use
Chain sharpness Before each use,
visual check
For damaged parts Before each use
For loose fasteners Before each use
For loose parts Before each use
Chain brake function Before each use
For fuel leaks Before each use
INSPECT AND CLEAN:
Bar Before each use
Complete saw After each use
Air filter Every 5 hours*

8
Chain brake Every 5 hours*
Replace spark plug Yearly
Replace fuel filter Yearly
* Hours of Operation
RESIDUAL RISK
Even when the product is used as prescribed, it is still
impossible to completely eliminate certain residual risk
factors. The following hazards may arise in use and the
operator should pay special attention to avoid the following:
■Injury caused by vibration
–Always use the right tool for the job. Use designated
handles. Restrict working time and exposure.
■Exposure to noise can cause hearing injury.
–Wear hearing protection and limit exposure.
■Contact with exposed saw teeth of the chain (cutting
hazards).
■Unforeseen, abrupt movement or kickback of the guide
bar (cutting hazards).
■Parts ejected from the saw chain (cutting/injection
hazards).
■Thrown out pieces of the work piece (wood chips,
splinters).
■Inhalation of saw dust and particles or emission from
the petrol engine.
■Skin contact with petrol/oil.
RISK REDUCTION
It has been reported that vibrations from handheld tools
may contribute to a condition called Raynaud’s Syndrome
in certain individuals. Symptoms may include tingling,
numbness, and blanching of the ngers, usually apparent
upon exposure to cold. Hereditary factors, exposure to
cold and dampness, diet, smoking and work practices
are all thought to contribute to the development of these
symptoms. There are measures that can be taken by the
operator to possibly reduce the effects of vibration:
■Keep your body warm in cold weather. When operating
the product, wear gloves to keep the hands and wrists
warm. It is reported that cold weather is a major factor
contributing to Raynaud’s Syndrome.
■After each period of operation, exercise to increase
blood circulation.
■Take frequent work breaks. Limit the amount of
exposure per day.
■Protective gloves available from professional chainsaw
retailers are designed specifically for chainsaw use,
which give protection, good grip and also reduce the
effect of handle vibration.
If you experience any of the symptoms of this condition,
immediately discontinue use and see your physician.
WARNING
Injuries may be caused, or aggravated, by prolonged
use of a tool. When using any tool for prolonged periods,
ensure you take regular breaks.
SAFETY DEVICES
LOW KICKBACK SAW CHAIN
A low-kickback saw chain helps to reduce the possibility of
a kickback event.
The rakers (depth gauges) ahead of each cutter can
minimize the force of a kickback reaction by preventing the
cutters from digging in too deeply. Only use replacement
guide bar and chain combinations recommended by the
manufacturer.
As saw chains are sharpened, they lose some the low
kickback qualities and extra caution is required. For your
safety, replace saw chains when cutting performance
decreases.
SPIKED BUMPER
The integral bumper spike may be used as a pivot when
making a cut. It helps to keep the body of the chainsaw
steady while cutting. When cutting, push the product
forward until the spikes dig into the edge of the wood, then
by moving the rear handle up or down in the direction of the
cutting line, it can help ease the physical strain of cutting.
GUIDE BARS
Generally, guide bars with small radius tips have somewhat
lower potential for kick-back. You should use a guide bar
and matching chain, which is just long enough for the job.
Longer bars increase the risk of loss of control during
sawing. Regularly check the chain tension. When cutting
smaller branches (less than the full length of the guide bar)
the chain is more likely to be thrown off if the tension is
not correct.
CHAIN BRAKE
Chain brakes are designed to quickly stop the chain from
rotating. When the chain brake lever/hand guard is pushed
towards the bar, the chain should stop immediately. A
chain brake does not prevent kickback. It only lowers the
risk of injury should the chain bar contact the operators
body during a kickback event. The chain brake should be
tested before each use for correct operation in both the run
and brake positions.
CHAIN CATCHER
A chain catcher prevents the saw chain from being thrown
back towards the operator if the saw chain comes loose
or breaks.

9
WHAT’S IN THE BOX
RCS3845
■Chainsaw x1
■Guide bar cover x1
■Combination wrench x1
■Operator’s manual x1
■Engine oil (76 ml) x1
■Chain and bar oil (76 ml) x1
SYMBOLS ON THE PRODUCT
Safety alert
To reduce the risk of injury, user must
read and understand operator’s manual
before using this product.
Regulatory Compliance Mark (RCM).
Product meets applicable regulatory
requirements.
Wear eye, hearing and head protection
when operating this equipment.
Wear non-slip safety footwear when
using the product.
Wear non-slip, heavy-duty protective
gloves when handling the chainsaw.
Danger! Beware of kickback.
Hold and operate the saw properly with
both hands.
Do not operate the saw using only one
hand.
Use unleaded petrol intended for motor
vehicle use with an octane rating of 91
([R+M]/2) or higher.
Use 2-stroke oil for air cooled engines.
Mix the fuel mix thoroughly and also
each time before refueling.
Add bar and chain oil every time you
add fuel to the chainsaw.
Mix fuel outdoors where there are no
sparks or ames.
Do not smoke when mixing fuel or lling
fuel tank.
The guaranteed sound power level is
115 dB
Run position
Half-choke position
Full-choke position
Set the chain brake to the "run"
position.
Set the chain brake to the "brake"
position.
Set the chain brake to the "run"
position.
Set the chain brake to the "brake"
position.
Fully press and release the primer bulb
at least 10 times.
Pull the choke lever all the way out to
the "full-choke" position.
Pull the starter grip until the engine
attempts to start (no more than ve
times).
Set the choke lever to the "half-choke"
position.
Pull starter grip until the engine starts
(no more than ve times).
Depress the trigger release and
squeeze the throttle trigger, then
release the throttle trigger to return the
engine to idle.
Allow the product to run idle for 15 - 30
seconds.
Bar and chain lubricant
Chain lubricant pump ow
+ = Increase ow
- = Decrease ow
PLACEHOLDER

10
Moving direction of the chain
Engage the chain brake to stop the
chain.
SYMBOLS IN THIS MANUAL
Mix fuel outdoors where there are no
sparks or ames.
Do not smoke when mixing fuel or lling
fuel tank.
Parts or accessories sold separately
Note
Warning
Wear eye and face protection.
Wear upper body protection.
Wear leg protection.
Stop the product.
Lock
Unlock
The following signal words and meanings are intended to
explain the levels of risk associated with the product.
DANGER
Indicates an imminently hazardous situation, which, if
not avoided, will result in death or serious injury.
WARNING
Indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation, which, if not
avoided, may result in minor or moderate injury.
CAUTION
Without safety alert symbol
Indicates a situation that may result in property damage.

11

12
WHAT’S IN THE BOX
x 1
x 1 x 1x 1
x 1
x 1
RCS3845

13
Know your product
KNOW YOUR PRODUCT
NOTE: When Chain brake is activated,
the unit will not operate.
1 2 3
15 14
56
11 10
9
12
13
16 1817
47
8
20
19
1. Front hand guard/Chain brake
2. Front handle
3. Rear handle
4. Chain lubricant cap
5. Fuel mix cap
6. Silencer
7. Spiked bumper
8. Air filter holder
9. Air filter
10. Choke lever
11. Switch
12. Starter grip
13. Chain catcher
14. Primer bulb
15. Throttle trigger
16. Trigger release
17. Locking tab
18. Air filter cover
19. Chain
20. Guide bar

14
GETTING STARTED
12
Personal protective equipment (PPE)
Good quality personal protective equipment, as used by
professionals, will help reduce the risk of injury to the
operator.
1. Fully press and release the primer bulb at least 10
times.
2. Pull the choke lever all the way out to the full-choke
position.
When the temperature is above 10°C, pull the starter grip
until the engine attempts to start, but no more than 3 times.
When the temperature is below 10°C, pull the starter grip
until the engine attempts to start, but no more than 5 times.
Remove the guide bar cover.
11
2
1
5x
12

15
GETTING STARTEDGETTING STARTED GETTING STARTED GETTING STARTED
1. Depress the trigger release.
2. Squeeze the throttle trigger.
3. Release the throttle trigger to return the engine to idle.
Allow the product to run idle for 15 - 30 seconds.
1. Depress the trigger release.
2. Squeeze the throttle trigger.
Always hold the product with your right hand at the rear
handle and your left hand at the front handle. Grip both
handles with the thumbs and fingers encircling the handles.
Ensure that your left hand is holding the front handle so that
your thumb is underneath.
Always hold the product with both hands during operation.
Use a firm grip with thumbs and fingers encircling the
chainsaw handles. Right hand must be on the rear handle
and left hand on the front handle.
Disengage the chain brake.Push the choke lever to the half-choke position. Pull the starter grip until engine starts.
Disengage the chain brake. Make sure the bar mounting nuts are loosened to nger-
tight.
To increase the chain tension, turn the chain tensioning
screw clockwise and check the chain tension frequently.
To reduce the chain tension, turn the chain tensioning
screw counterclockwise and check the chain tension
frequently.
Tighten the bar mounting nuts by turning them clockwise
to 11 ~ 13 Nm (Turn the nut 180° or 3 ats past nger
tight). Do not overtighten.
Pre-mix unleaded petrol and 2-cycle engine lubricant in a
clean container approved for petrol.
1. Loosen the fuel cap by turning it counterclockwise.
2. Lift the fuel cap and set aside.
3. Carefully pour the fuel mixture into the tank. Avoid
spillage. Prior to replacing the fuel cap, clean and
inspect the gasket. Immediately replace the fuel cap
and hand tighten it. Wipe away any fuel spillage.
1. Loosen the oil tank cap by turning it counterclockwise.
2. Lift the oil tank cap and set aside.
3. Pour the oil into the oil tank and monitor the oil level
gauge. Ensure that no dirt enters the oil tank while
filling. Put the oil tank cap back on and tighten. Wipe
away any spillage.
NOTE: It is recommended that the air filter be lubricated with several
drops of chain and bar oil before first use. Refer to page 32.
1. Engage the chain brake by pushing the front hand
guard/chain brake forward.
43
1413
2
1
5
2
1
6
2
1
3
15 16
(50 : 1)
7
2
3
8
2
1
17
2
3
9 10

16

17
OVERVIEW
Felling a tree Removing buttress roots Bucking a log
Chain replacement Start warm engine Limbing a tree
p.19 p.20 p.21
p.25 p.23 p.22

18
OVERVIEW
Cleaning the chain brake Cleaning the air filter
Spark plug replacement
Transportation
Adding oil to the air filter
Chain tensioning Storage
p.34p.32p.31
p.28 p.27 p.38
p.36