Makita UC3551A User manual

INSTRUCTION MANUAL
MANUEL D'INSTRUCTION
MANUAL DE INSTRUCCIONES
Electric Chain Saw
Tronçonneuse Electrique
Electrosierra
UC3551A
UC4051A
IMPORTANT: Read Before Using.
IMPORTANT : Lire avant usage.
IMPORTANTE: Lea antes de usar.
DOUBLE INSULATION
DOUBLE ISOLATION
DOBLE AISLAMIENTO

2ENGLISH
ENGLISH (Original instructions)
SPECIFICATIONS
Model UC3551A UC4051A
Max. chain speed 14.5 m/s (47.6 ft/s) (870 m/min (2,900 ft/min))
Standard guide bar Bar length 350 mm (14") 400 mm (16")
Cutting length 320 mm (12-5/8") 355 mm (14")
Part No 165201-8 165202-6
Guide bar type Sprocket nose bar
Standard saw chain Type 91PX
Pitch 3/8"
No. of drive links 52 56
Recommended guide bar length 350 mm (14"), 400 mm (16")
Overall length (without guide bar) 505 mm (19-7/8")
Net weight 5.5 kg (12.1 lbs) 5.6 kg (12.3 lbs)
• Due to our continuing program of research and development, the specications herein are subject to change with-
out notice.
• Specications may di󰀨er from country to country.
• Weight according to EPTA-Procedure 01/2003
General Power Tool Safety Warnings
WARNING Read all safety warnings and all
instructions. Failure to follow the warnings and instruc-
tions may result in electric shock, re and/or serious
injury.
Save all warnings and instruc-
tions for future reference.
The term "power tool" in the warnings refers to your
mains-operated (corded) power tool or battery-operated
(cordless) power tool.
Work area safety
1. Keep work area clean and well lit. Cluttered or
dark areas invite accidents.
2. Do not operate power tools in explosive atmo-
spheres, such as in the presence of ammable
liquids, gases or dust. Power tools create sparks
which may ignite the dust or fumes.
3. Keep children and bystanders away while
operating a power tool. Distractions can cause
you to lose control.
Electrical safety
4. Power tool plugs must match the outlet. Never
modify the plug in any way. Do not use any
adapter plugs with earthed (grounded) power
tools. Unmodied plugs and matching outlets will
reduce risk of electric shock.
5. Avoid body contact with earthed or grounded
surfaces such as pipes, radiators, ranges and
refrigerators. There is an increased risk of elec-
tric shock if your body is earthed or grounded.
6. Do not expose power tools to rain or wet con-
ditions. Water entering a power tool will increase
the risk of electric shock.
7. Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool.
Keep cord away from heat, oil, sharp edges
or moving parts. Damaged or entangled cords
increase the risk of electric shock.
8. When operating a power tool outdoors, use an
extension cord suitable for outdoor use. Use of
a cord suitable for outdoor use reduces the risk of
electric shock.
9. If operating a power tool in a damp location is
unavoidable, use a ground fault circuit inter-
rupter (GFCI) protected supply. Use of an GFCI
reduces the risk of electric shock.
Personal safety
10. Stay alert, watch what you are doing and use
common sense when operating a power tool.
Do not use a power tool while you are tired or
under the inuence of drugs, alcohol or med-
ication. A moment of inattention while operating
power tools may result in serious personal injury.
11. Use personal protective equipment. Always
wear eye protection. Protective equipment such
as dust mask, non-skid safety shoes, hard hat, or
hearing protection used for appropriate conditions
will reduce personal injuries.
12. Prevent unintentional starting. Ensure the
switch is in the o󰀨-position before connecting
to power source and/or battery pack, picking
up or carrying the tool. Carrying power tools with
your nger on the switch or energising power tools
that have the switch on invites accidents.
13. Remove any adjusting key or wrench before
turning the power tool on. A wrench or a key left
attached to a rotating part of the power tool may
result in personal injury.
14. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the power tool in unexpected situations.

3ENGLISH
15. Dress properly. Do not wear loose clothing or
jewellery. Keep your hair, clothing, and gloves
away from moving parts. Loose clothes, jewel-
lery or long hair can be caught in moving parts.
16. If devices are provided for the connection of
dust extraction and collection facilities, ensure
these are connected and properly used. Use of
dust collection can reduce dust-related hazards.
Power tool use and care
17. Do not force the power tool. Use the correct
power tool for your application. The correct
power tool will do the job better and safer at the
rate for which it was designed.
18. Do not use the power tool if the switch does
not turn it on and o󰀨. Any power tool that cannot
be controlled with the switch is dangerous and
must be repaired.
19. Disconnect the plug from the power source
and/or the battery pack from the power tool
before making any adjustments, changing
accessories, or storing power tools. Such pre-
ventive safety measures reduce the risk of starting
the power tool accidentally.
20. Store idle power tools out of the reach of chil-
dren and do not allow persons unfamiliar with
the power tool or these instructions to operate
the power tool. Power tools are dangerous in the
hands of untrained users.
21. Maintain power tools. Check for misalignment
or binding of moving parts, breakage of parts
and any other condition that may a󰀨ect the
power tool’s operation. If damaged, have the
power tool repaired before use. Many accidents
are caused by poorly maintained power tools.
22. Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
23. Use the power tool, accessories and tool bits
etc. in accordance with these instructions, tak-
ing into account the working conditions and
the work to be performed. Use of the power tool
for operations di󰀨erent from those intended could
result in a hazardous situation.
Service
24. Have your power tool serviced by a qualied
repair person using only identical replacement
parts. This will ensure that the safety of the power
tool is maintained.
25. Follow instruction for lubricating and chang-
ing accessories.
26. Keep handles dry, clean and free from oil and
grease.
USE PROPER EXTENSION CORD. Make sure your
extension cord is in good condition. When using an
extension cord, be sure to use one heavy enough to
carry the current your product will draw. An undersized
cord will cause a drop in line voltage resulting in loss of
power and overheating. Table 1 shows the correct size
to use depending on cord length and nameplate ampere
rating. If in doubt, use the next heavier gage. The
smaller the gage number, the heavier the cord.
Table 1: Minimum gage for cord
Ampere Rating
Volts Total length of cord in feet
More Than Not More Than
120V 25 ft. 50 ft. 100 ft. 150 ft.
AWG
06
6
10
12
10
12
16
18
18
16
14
16 16 14
1416
16
12
14
12
12
Not Recommended
220V - 240V 50 ft. 100 ft. 200 ft. 300 ft.
Chain saw safety warnings
1. Keep all parts of the body away from the saw
chain when the chain saw is operating. Before
you start the chain saw, make sure the saw
chain is not contacting anything. A moment of
inattention while operating chain saws may cause
entanglement of your clothing or body with the
saw chain.
2. Always hold the chain saw with your right
hand on the rear handle and your left hand on
the front handle. Holding the chain saw with a
reversed hand conguration increases the risk of
personal injury and should never be done.
3. Hold the power tool by insulated gripping
surfaces only, because the saw chain may con-
tact hidden wiring or its own cord. Saw chains
contacting a "live" wire may make exposed metal
parts of the power tool "live" and could give the
operator an electric shock.
4. Wear safety glasses and hearing protection.
Further protective equipment for head, hands,
legs and feet is recommended. Adequate pro-
tective clothing will reduce personal injury by ying
debris or accidental contact with the saw chain.
5. Do not operate a chain saw in a tree. Operation
of a chain saw while up in a tree may result in
personal injury.

4ENGLISH
6. Always keep proper footing and operate the
chain saw only when standing on xed, secure
and level surface. Slippery or unstable surfaces
such as ladders may cause a loss of balance or
control of the chain saw.
7. When cutting a limb that is under tension be
alert for spring back. When the tension in the
wood bres is released the spring loaded limb may
strike the operator and/or throw the chain saw out
of control.
8. Use extreme caution when cutting brush and
saplings. The slender material may catch the saw
chain and be whipped toward you or pull you o󰀨
balance.
9. Carry the chain saw by the front handle with
the chain saw switched o󰀨 and away from your
body. When transporting or storing the chain
saw always t the guide bar cover. Proper
handling of the chain saw will reduce the likelihood
of accidental contact with the moving saw chain.
10. Follow instructions for lubricating, chain ten-
sioning and changing accessories. Improperly
tensioned or lubricated chain may either break or
increase the chance for kickback.
11. Keep handles dry, clean, and free from oil and
grease. Greasy, oily handles are slippery causing
loss of control.
12. Cut wood only. Do not use chain saw for pur-
poses not intended. For example: do not use
chain saw for cutting plastic, masonry or non-
wood building materials. Use of the chain saw
for operations di󰀨erent than intended could result
in a hazardous situation.
13. 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 chain saw
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 incor-
rect operating procedures or conditions and can
be avoided by taking proper precautions as given
below:
— Maintain a rm grip, with thumbs and
ngers encircling the chain saw handles,
with both hands on the saw and position
your body and arm to allow you to resist
kickback forces. Kickback forces can be
controlled by the operator, if proper precau-
tions are taken. Do not let go of the chain
saw.
— Do not overreach and do not cut above
shoulder height. This helps prevent unin-
tended tip contact and enables better control
of the chain saw in unexpected situations.
— Only use replacement bars and chains
specied by the manufacturer. Incorrect
replacement bars and chains may cause
chain breakage and/or kickback.
— Follow the manufacturer’s sharpening
and maintenance instructions for the saw
chain. Decreasing the depth gauge height
can lead to increased kickback.
ADDITIONAL SAFETY RULES
1. Read the instruction manual in order to familiarize
yourself with operation of the chain saw.
2. Before using the chain saw for the rst time,
arrange to have instruction in its operation. If this
is not possible, at least practice cutting round
timber on a trestle before beginning work.
3. The chain saw must not be used by children or
young persons under 18 years of age. Young
persons over 16 years of age may be exempted
from this restriction if they are undergoing training
under the supervision of an expert.
4. Working with the chain saw requires a high level of
concentration. Do not work with the saw if you are
not feeling t and well. Carry out all work calmly
and carefully.
5. Never work under the inuence of alcohol, drugs
or medication.
Proper use
1. The chain saw is intended solely for cutting wood.
Do not use it for example to cut plastic or porous
concrete.
2. Only use the chain saw for operations described in
this instruction manual. Do not, for example, use it
to trim hedges or for similar purposes.
3. The chain saw must not be used for forestry work,
i.e. for felling and limbing standing timber. The
chain saw cable does not provide the operator
with the mobility and safety required for such
work.
4. The chain saw is not intended for commercial use.
5. Do not overload the chain saw.

5ENGLISH
Personal protective equipment
1. Clothing must be close-tting, but must not
obstruct mobility.
2. Wear the following protective clothing during work:
• A tested safety helmet, if a hazard is pre-
sented by falling branches or similar;
• A face mask or goggles;
• Suitable ear protection (ear mu󰀨s, custom or
mouldable ear plugs). Octave brand analysis
upon request.
• Firm leather safety gloves;
• Long trousers manufactured from strong
fabric;
• Protective dungarees of cut-resistant fabric;
• Safety shoes or boots with non-slip soles,
steel toes, and cut-resistant fabric lining;
• A breathing mask, when carrying out work
which produces dust (e.g. sawing dry wood).
Protection against electric shock
The chain saw must not be used in wet
weather or damp environments, as the
electric motor is not waterproof.
1. Only plug the saw into sockets in tested electrical
circuits. Check that the system voltage matches
that on the rating plate. Ensure that a 16 A line
fuse is tted. Saws used in the open air must
be connected to a residual current-operated cir-
cuit-breaker with an operating current no higher
than 30 mA.
Should the connecting cable be damaged,
withdraw the mains plug immediately.
Safe working practices
1. Before starting work, check that the chain saw
is in proper working order and that its condition
complies with the safety regulations. Check in
particular that:
• The chain brake is working properly;
• The run-down brake is working properly;
• The bar and the sprocket cover are tted
correctly;
• The chain has been sharpened and ten-
sioned in accordance with the regulations;
• The mains cable and mains plug are
undamaged;
Refer to the "CHECKS " section.
2. Always ensure in particular that the extension
cable used is of adequate cross-section (see
"SPECIFICATIONS"). When using a cable reel,
wind the cable completely o󰀨 the reel. When using
the saw in the open air, ensure that the cable
employed is intended for open-air use and is rated
accordingly.
3. Keep the cord away from the cutting area and
to position cord so that it will not be caught on
branches, and the like, during cutting.
4. Do not operate the chain saw in the vicinity of
ammable dust or gases, as the motor generates
sparks and presents a risk of explosion.
5. Work only on rm ground and with a good footing.
Pay particular attention to obstacles (e.g. the
cable) in the working area. Take particular care
where moisture, ice, snow, freshly cut wood or
bark may make surfaces slippery. Do not stand on
ladders or trees when using the saw.
6. Take particular care when working on sloping
ground; rolling trunks and branches pose a poten-
tial hazard.
7. Never cut above shoulder height.
8. Hold the chain saw with both hands when
switching it on and using it. Hold the rear han-
dle with your right hand and the front handle with
your left. Hold the handles rmly with your thumbs.
The bar and the chain must not be in contact with
any objects when the saw is switched on.
9. Clean the area to be cut of foreign objects such
as sand, stones, nails, wire, etc. Foreign objects
damage the bar and chain, and can lead to dan-
gerous kickback.
10. Take particular care when cutting in the vicinity of
wire fences. Do nut cut into the fence, as the saw
may kick back.
11. Do not cut into the ground.
12.
Cut pieces of wood singly, not in bunches or stacks.
13. Avoid using the saw to cut thin branches and
roots, as these can become entangled in the chain
saw. Loss of balance presents a hazard.
14. Use a secure support (trestle) when cutting sawn
timber.
15. Do not use the chain saw to prise o󰀨 or brush
away pieces of wood and other objects.
16. Guide the chain saw such that no part of your
body is within the extended path of the saw chain
(see gure).

6ENGLISH
17. When moving around between sawing operations,
apply the chain brake in order to prevent the chain
from being operated unintentionally. Hold the
chain saw by the front handle when carrying it,
and do not keep your nger on the switch.
18. Withdraw the mains plug when taking breaks
or leaving the chain saw unattended. Leave the
chain saw where it cannot present a hazard.
Kickback
1. Hazardous kickback may arise during work with
the chain saw. Kickback arises when the tip of the
bar (in particular the upper quarter) comes into
contact with wood or another solid object. This
causes the chainsaw to be deected in the direc-
tion of the operator.
2. In order to avoid kickback, observe the following:
• Never begin the cut with the tip of the bar.
• Never use the tip of the bar for cutting. Take
particular care when resuming cuts which
have already been started.
• Start the cut with the chain running.
• Always sharpen the chain correctly. In par-
ticular, set the depth gauge to the correct
height.
• Never saw through several branches at a
time.
• When limbing, take care to prevent the
bar from coming into contact with other
branches.
• When bucking, keep clear of adjacent trunks.
Always observe the bar tip.
• Use a trestle.
Safety features
1. Always check that the safety features are in
working order before starting work. Do not use the
chain saw if the safety features are not working
properly.
— Chain brake:
The chain saw is tted with a chain brake which
brings the saw chain to a standstill within a fraction
of a second. It is activated when the hand guard
is pushed forwards. The saw chain then stops
within 0.15 s, and the power supply to the motor is
interrupted.
12
1. Chain brake applied 2. Chain brake released
— Run-down brake:
The chain saw is equipped with an run down
brake which brings the saw chain to an immediate
stop when the ON/OFF switch is released. This
prevents the saw chain from running on when
switched o󰀨, and thus presenting a hazard.
— The front and rear hand guards protect the user
against injury from pieces of wood which may be
thrown backwards, or a broken saw chain.
— The trigger lockout prevents the chain saw from
being switched on accidentally.
— The chain catcher protects the user against injury
should the chain jump or break.
Transport and storage
When the chain saw is not in use or is
being transported, withdraw the mains plug
and t the guide bar cover supplied with the
saw. Never carry or transport the saw with
the saw chain running.
1. Carry the chain saw by the front handle only, with
the bar pointing backwards.
2. Keep the chain saw in a secure, dry and locked
room out of the reach of children. Do not store the
chain saw outdoors.
MAINTENANCE
1. Withdraw the plug from the socket before carrying
out any adjustments or maintenance.
2. Check the power cable regularly for damage to the
insulation.
3. Clean the chain saw regularly.
4. Have any damage to the plastic housing repaired
properly and immediately.
5. Do not use the saw if the switch trigger is not
working properly. Have it properly repaired.
6. Under no circumstances should any modications
be made to the chain saw. Your safety is at risk.
7.
Do not carry out maintenance or repair work other than
that described in this instruction manual. Any other
work must be carried out by authorized service centers.
8. Only use genuine replacement parts and acces-
sories intended for your model of saw. The use of
other parts increases the risk of accident.
9. We accept no responsibility for accidents or dam-
age should non-approved bars, saw chains or
other replacement parts or accessories be used.

7ENGLISH
First aid
Do not work alone. Always work within
shouting distance of a second person.
1. Always keep a rst-aid box to hand. Replace any
items taken from it immediately.
2. Should you request assistance in the event of an
accident, state the following:
• Where did the accident happen?
• What happened?
• How many persons are injured?
• What injuries do they have?
• Who is reporting the accident?
NOTE: Individuals with poor circulation who are
exposed to excessive vibration may experience injury
to blood vessels or the nervous system.
Vibration may cause the following symptoms to occur
in the ngers, hands or wrists: "Falling asleep "(numb-
ness), tingling, pain, stabbing sensation, alteration of
skin colour or of the skin.
If any of these symptoms occur, see a physician!
SAVE THESE INSTRUCTIONS.
WARNING: DO NOT let comfort or famil-
iarity with product (gained from repeated
use) replace strict adherence to safety
rules for the subject product. MISUSE or
failure to follow the safety rules stated in
this instruction manual may cause serious
personal injury.
Symbols
The followings show the symbols used for tool.
volts
amperes
hertz
alternating current
Class II Construction
meter per second
feet per minute
parts number of applicable saw chain and
guide bar
Caution: particular care and attention
required!
Read instruction manual and follow the
warnings and safety instructions.
Wear eye protection.
Wear ear protection.
Pull out the power supply plug if the cable
is damaged!
Withdraw the mains plug!
Protect against rain and damp!
Contact of the guide bar tip with any object
should be avoided! Tip contact may cause
the guide bar to move suddenly upward
and backward, which may cause serious
injury!
Always use two hands when operating the
chain saw!
Wear a helmet, goggles and ear protection!
Direction of chain travel
Chain oil
Chain brake released
Chain brake applied
Prohibited!

8ENGLISH
DESIGNATION OF PARTS
1
2
34
5
6
9
10
8
7
14
12
11
15
13
17
16 18
Cord hook
1
2
3
4
5
6
7
9
8
10
11
12
13
Spike bumper
18
14
15
16
17
Rear handle
Switch trigger
Oil filler cap
Front handle
Front hand guard
Guide bar
Saw chain
Lever
Adjusting dial
Oil level sight
Rear hand guard
Lock-off button
Chain catcher
Guide bar cover
Adjusting screw for oil pump
(at the bottom)
Sprocket cover

9ENGLISH
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched o󰀨 and
unplugged before carrying out any work on the
tool.
Removing or installing sprocket
cover
To remove the sprocket cover, perform the following steps:
1
2
► 1. Lever 2. Sprocket cover
Press and fully open the lever until it stops.
Turn the lever counterclockwise.
To install the sprocket cover, perform the above steps
in reverse.
Removing or installing saw chain
CAUTION:
• Always wear gloves when installing or removing
the saw chain.
To install the saw chain, perform the following steps:
1.
Make sure the direction of the chain. The arrow
mark on the chain shows the direction of the chain.
1
► 1. Sprocket
2. Fit in one end of the saw chain on the top of
the guide bar and the other end of it around the
sprocket.
3. Place the guide bar on the chain saw.
4. Align the tension slide with the hole of the guide
bar.
2
1
► 1. Guide bar 2. Hole
5. Place the sprocket cover so that the hooks t
alongside the holes and the pin ts its counterpart
on the sprocket cover.
3
1
2
► 1. Hook 2. Hole 3. Pin
6. Turn the lever clockwise fully and a quarter
turn back to keep looseness for adjusting chain
tension.
7. Turn the adjusting dial, and adjust the chain
tension.
(See the chapter on "Adjusting saw chain tension"
for procedure.)
8. Turn the lever clockwise to secure the sprocket
cover.
1
2
► 1. Lever 2. Sprocket cover

10 ENGLISH
To remove the saw chain, perform the following steps:
9. Turn the adjusting dial to "-" direction to release
the saw chain tension.
1
► 1. Adjusting dial
10. Remove the sprocket cover.
11.
Remove the saw chain and guide bar from the chain saw.
Adjusting saw chain tension
The saw chain may become loose after many hours of use.
From time to time check the saw chain tension before use.
1. Loosen the sprocket cover lightly.
2. Lift up the guide bar tip slightly.
3.
Turn the adjusting screw / dial to adjust saw chain tension.
12
35
4
► 1. Loosen 2. Tighten 3. Adjusting dial 4. Guide bar
5. Saw chain
4. Tighten the saw chain until the lower side of the
saw chain ts in the guide bar rail (see circle).
5.
Keep holding the guide bar lightly, tighten the sprocket
cover after adjusting the chain tension. Make sure that
the saw chain does not loose at lower side.
Make sure the saw chain ts snugly against the lower side of the bar.
CAUTION:
• Do not tighten the saw chain too much.
Excessively high tension of saw chain may
cause breakage of saw chain, wear of the guide
bar and breakage of the adjusting dial.
• A chain which is too loose can jump o󰀨 the bar,
and therefore presents an accident risk.
• Carry out the procedure of installing or removing
saw chain in a clean place free from sawdust
and the like.
Engaging extension cord
CAUTION:
• Make sure that the extension cord is unplugged
to the mains outlet.
4
3
1
2
► 1. Cord hook 2. Tool's cord 3. Extension cord 4. Plug and
socket (the shape may di󰀨er from country to country)
When engaging the extension cord, secure it to the
chain saw's cord with the cord hook.
Attach the cord hook about 100 - 200 mm (4 - 8") from
the extension cord connector. This helps prevent unin-
tentional disconnection.
OPERATION
CAUTION:
• Hold the tool rmly with right hand on the rear
handle and left hand on the front handle when
performing the tool.
Switch action
1
2
► 1. Lock-o󰀨 button 2. Switch trigger
CAUTION:
•
Always be sure that the tool is switched o󰀨 and
unplugged before checking function on the switch trigger.
• Before plugging in the tool, always check to see
that the switch trigger actuates properly and
returns to the "OFF" position when released.

11 ENGLISH
To prevent the switch trigger from being accidentally
pulled, a lock-o󰀨 button is provided.
To start the tool, depress the lock-o󰀨 button and pull the
switch trigger. Release the switch trigger to stop.
Electric brake
This tool is equipped with an electric brake. If the tool
consistently fails to quickly stop after the switch trigger
is released, have the tool serviced at a Makita service
center.
Lubrication
CAUTION:
• Always be sure that the tool is switched o󰀨 and
unplugged before lubricating the saw chain.
Reclaimend
oil
Lubricate the saw chain and bar using biologically
degradable saw chain oil with an adhesion agent.
The adhesion agent in the saw chain oil prevents the
oil from being thrown o󰀨 the saw excessively quickly.
Mineral oils must not be used, as they are harmful to the
environment.
CAUTION:
• Prevent the oil from coming into contact with the
skin and eyes. Contact with the eyes causes
irritation. In the event of eye contact, ush the
a󰀨ected eye immediately with clear water, then
consult a doctor at once.
• Never use waste oil. Waste oil contains carcino-
genic substances. The contaminants in waste
oil cause accelerated wear of the oil pump, the
bar and the chain. Waste oil is harmful to the
environment.
• When lling the chain saw with chain oil for the
rst time, or relling the tank after it has been
completely emptied, add oil up to the bottom
edge of the ller neck. The oil delivery may
otherwise be impaired.
1
2
► 1. Oil ller cap 2. Strap
To ll the oil, perform the following steps:
1. Clean the area around the oil ller cap thoroughly
to prevent any dirt from entering the oil tank.
2. Unscrew the oil ller cap and add oil up to the
lower edge of the ller neck.
3. Screw the oil ller cap rmly back in place.
4. Wipe away any spilt chain oil carefully.
NOTE:
•
When the chain saw is used for the rst time, it may
take up to two minutes for the saw chain oil to begin
its lubricating e󰀨ect upon the saw mechanism. Run
the saw without load until it does so (see "CHECKS ").
CHECKS
Before starting work, carry out the following checks:
Checking the chain tension
WARNING:
• Always withdraw the mains plug before check-
ing the chain tension, and wear safety gloves.
12
35
4
► 1. Loosen 2. Tighten 3. Adjusting dial 4. Guide bar 5. Saw chain
Make sure the saw chain ts snugly against the lower
side of the bar (see circle).
Check the chain tension frequently, as new chains are
subject to elongation.
Excessively high tension of saw chain may cause breakage of saw
chain, wear of the guide bar and breakage of the adjusting dial.
A chain which is too loose can jump o󰀨 the bar, and
therefore presents an accident risk.
If the chain is too loose: Refer to the section titled "Adjusting
saw chain tension" and adjust the saw chain tension again.

12 ENGLISH
Checking the switch action
CAUTION: Before plugging in the tool, always
check to see that the switch trigger actuates properly
and returns to the "OFF" position when released.
To prevent the switch trigger from being accidentally
pulled, a lock-o󰀨 button is provided.
To start the tool, depress the lock-o󰀨 button and pull the
switch trigger. Release the switch trigger to stop.
Do not pull the switch trigger hard without depressing
the lock-o󰀨 button. This may cause switch breakage.
Checking the chain brake
NOTE:
• If the chain saw fails to start, check whether the
chain brake is released. To release the chain
brake, pull the hand guard backwards rmly until
you feel it engage.
1
2
3
► 1. Front hand guard 2. Lock 3. Unlock
1
32
► 1. Front hand guard 2. Unlock 3. Lock
Check the chain brake as follows:
1. Hold the chain saw with both hands when switch-
ing it on. Hold the rear handle with your right hand,
the front handle with your left. Make sure that the
bar and the chain do not contact with any object.
2. First press the lock-o󰀨 button, then the switch
trigger. The saw chain starts immediately.
3. Press the front hand guard forwards using the
back of your hand. Make sure that the saw chain
comes to an immediate standstill.
CAUTION:
• If the saw chain does not stop immediately,
do not use the saw under any circumstances.
Consult Makita Makita authorized or factory
service centers.
Checking the run-down brake
Switch on the chain saw.
Release the switch trigger completely. Make sure the
saw chain comes to a standstill within a second.
CAUTION:
• If the saw chain does not stop immediately,
do not use the saw under any circumstances.
Consult Makita Makita authorized or factory
service centers.
Checking the chain oiler
Before starting work, check the oil level in the tank, and
the oil delivery.
The oil level can be seen in the oil level sight shown in
the gure.
1
► 1. Oil level sight
Check the oil delivery as follows:
Start the chain saw.
With the saw running, hold the saw chain approximately
15 cm (6") above a tree trunk or the ground. If lubrica-
tion is adequate, the oil spray will produce a light oil
trace.
Observe the wind direction, and do not expose yourself
to the oil spray unnecessarily.
CAUTION:
• If an oil trace is not formed, do not use the
saw. The lifespan of the chain will otherwise be
reduced. Check the oil level. Clean the oil feed
groove and the oil feed hole in the bar (refer to
"MAINTENANCE ").

13 ENGLISH
Adjusting the chain lubrication
You can adjust the oil pump feed rate with the adjusting
screw.
WORKING WITH THE CHAIN SAW
CAUTION:
• Always use a front handle and rear handle and
rmly hold the tool by both front handle and rear
handle during operations.
• Always secure the timber to be cut, otherwise
the cut fragments may cause personal injury.
Bucking
1
► 1. Spike bumper
For bucking cuts, rest the spike bumper shown in the
gure on the wood to be cut.
With the saw chain running, saw into the wood, using
the rear handle to raise the saw and the front one to
guide it. Use the spike bumper as a pivot.
Continue the cut by applying slight pressure to the front
handle, easing the saw back slightly. Move the spike
bumper further down the timber and raise the front
handle again.
When making several cuts, switch the chain saw o󰀨
between cuts.
CAUTION:
• If the upper edge of the bar is used for cutting,
the chain saw may be deected in your direction
if the chain becomes trapped. For this reason,
cut with the lower edge, so that the saw will be
deected away from your body.
Cut wood under tension on the pressure side (A) rst.
Then make the nal cut on the tension side (B). This
prevents the bar from becoming trapped.
A
B
A
B
Limbing
CAUTION:
• Limbing may only be performed by trained
persons. A hazard is presented by the risk of
kick-back.
When limbing, support the chain saw on the trunk if
possible. Do not cut with the tip of the bar, as this pres-
ents a risk of kickback.
Pay particular attention to branches under tension. Do
not cut unsupported branches from below.
Do not stand on the felled trunk when limbing.

14 ENGLISH
Burrowing and parallel-to-grain cuts
CAUTION:
• Burrowing and parallel-to-grain cuts may only
be carried out by persons with special training.
The possibility of kickback presents a risk of
injury.
Perform parallel-to-grain cuts at as shallow an angle as
possible. Carry out the cut as carefully as possible, as
the spike bumper cannot be used.
Felling
CAUTION:
• Felling work may only be performed by trained
persons. The work is hazardous.
Observe local regulations if you wish to fell a tree.
45o
2 1/2
45o
1
► 1. Felling area
— Before starting felling work, ensure that:
(1) Only persons involved in the felling operation
are in the vicinity;
(2) Any person involved has an unhindered path
of retreat through a range of approximately
45 ° either side of the felling axis. Consider
the additional risk of tripping over electrical
cables;
(3) The base of the trunk is free of foreign
objects, roots and ranches;
(4) No persons or objects are present over a
distance of 2 1/2 tree lengths in the direction
in which the tree will fall.
— Consider the following with respect to each tree:
• Direction of lean;
• Loose or dry branches;
• Height of the tree;
• Natural overhang;
• Whether or not the tree is rotten.
— Consider the wind speed and direction. Do not
carry out felling work if the wind is gusting strongly.
— Trimming of root swellings: Begin with the largest
swellings. Make the vertical cut rst, then the
horizontal cut.
— Cut a scarf: The scarf determines the direction in
which the tree will fall, and guides it. It is made
on the side towards which the tree is to fall. Cut
the scarf as close to the ground as possible. First
make the horizontal cut to a depth of 1/5 -1/3 of
the trunk diameter. Do not make the scarf too
large. Then make the diagonal cut.
— Cut any corrections to the scarf across its entire
width.
— Make the back cut a little higher than the base
cut of the scarf. The back cut must be exactly
horizontal. Leave approximately 1/10 of the trunk
diameter between the back cut and the scarf.
The wood bers in the uncut trunk portion act as
a hinge. Do not cut right through the bers under
any circumstances, as the tree will otherwise fall
unchecked. Insert wedges into the back cut in
time.
— Only plastic or aluminum wedges may be used to
keep the back cut open. The use of iron wedges is
prohibited.

15 ENGLISH
— Stand to the side of the falling tree. Keep an area
clear to the rear of the falling tree up to an angle of
45 ° either side of the tree axis (refer to the " felling
area " gure). Pay attention to falling branches.
— 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 as illustrated in gure.
1
2
2
33
► 1. Felling direction 2. Danger zone 3. Escape route
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched o󰀨 and
unplugged before attempting to perform inspec-
tion or maintenance.
• Always wear gloves when performing any
inspection or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
Carry out the maintenance work described below at
regular intervals. Warranty claims will be accepted only
if these operations have been performed regularly and
properly.
Only maintenance work described in this instruction
manual may be performed by the user. Any other work
must be carried out by Makita Authorized or Factory
Service Centers.
Cleaning the chain saw
Clean the saw regularly with a clean rag. The handles,
in particular, must be kept free of oil.
Checking the plastic housing
Carry out regular visual inspections of all parts of the
housing. If any parts are damaged, have them repaired
immediately and properly in Makita Authorized or
Factory Service Centers.
Sharpening the saw chain
CAUTION:
• Always withdraw the mains plug and wear
safety gloves when performing work on the saw
chain.
Sharpen the saw chain when:
— Mealy sawdust is produced when damp wood is
cut;
— The chain penetrates the wood with di󰀩culty, even
when heavy pressure is applied;
— The cutting edge is obviously damaged;
— The saw pulls to the left or right in the wood. The
reason for this behavior is uneven sharpening of
the saw chain, or damage to one side only.
Sharpen the saw chain frequently,
but remove only a little material each
time.
Two or three strokes with a le are usually su󰀩cient
for routine resharpening. When the saw chain has
been resharpened several times, have it sharpened in
Authorized or Factory Service Centers.
Sharpening criteria:
— All cutter length must be equal. Cutters of di󰀨ering
length prevent the chain from running smoothly,
and may cause the chain to break.
— Do not sharpen the chain once a minimum cutter
length of 3 mm has been reached. A new chain
must then be tted.
— The chip thickness is determined by the distance
between the depth gauge (round nose) and the
cutting edge.
— The best cutting results are obtained with following
distance between cutting edge and depth gauge.
Chain blade 91PX: 0.65 mm (0.025")

16 ENGLISH
22
11
31
► 1. Cutting length 2. Distance between cutting edge
and depth gauge 3. Minimum 3 mm
WARNING:
• An excessive distance increases the risk of
kick-back.
— The sharpening angle of 30 ° must be the same
on all cutters. Di󰀨erences in angle cause the chain
to run roughly and unevenly, accelerate wear, and
lead to chain breaks.
— The side plate angle of the cutter is determined
by the depth of penetration of the round le. If the
specied le is used properly, the correct side
plate angle is produced automatically.
— Side plate angle for each saw chain are as follows:
Chain blade 91PX: 80 °
30
30
11
► 1. Side plate angle
File and le guiding
— Use a special round le (optional accessory) for
saw chains to sharpen the chain. Normal round
les are not suitable.
— Diameter of the round le for each saw chain is as
follows:
Chain blade 91PX: 4.0 mm (11/64")
— The le should only engage the cutter on the for-
ward stroke. Lift the le o󰀨 the cutter on the return
stroke.
— Sharpen the shortest cutter rst. Then the length
of this shortest cutter becomes the standard for all
other cutters on the saw chain.
— Guide the le as shown in the gure.
— The le can be guided more easily if a le holder
(optional accessory) is employed. The le holder
has markings for the correct sharpening angle of
30 ° (align the markings parallel to the saw chain)
and limits the depth of penetration (to 4/5 of the
le diameter).
30
— After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
— Remove any projecting material, however small,
with a special at le (optional accessory).
— Round o󰀨 the front of the depth gauge again.

17 ENGLISH
Cleaning the guide bar and
lubricating the return sprocket
CAUTION:
• Always wear safety gloves for this task. Burrs
present a risk of injury.
Check the running surfaces of the bar regularly for
damage. Clean using a suitable tool, and remove burrs
if necessary.
If the chain saw receives frequent use, lubricate the
return sprocket bearing at least once a week. Before
adding new fresh grease, carefully clean the 2 mm hole
on the tip of the guide bar, then force a small quantity of
multi-purpose grease (optional accessory) into the hole.
Cleaning the oil guide
1
2
► 1. Oil guide groove 2. Oil feed hole
— Clean the oil guide groove and the oil feed hole in
the bar at regular intervals.
New saw chains
Use two or three saw chains alternately, so that the saw
chain, sprocket and running surfaces of the bar wear
evenly.
Turn the bar over when changing the chain so that the
bar groove wears evenly.
CAUTION:
• Only use chains and bars which are
approved for this model of saw (refer to
"SPECIFICATIONS").
1
► 1. Sprocket
Before tting a new saw chain, check the condition of
the sprocket.
CAUTION:
• A worn sprocket damages a new saw chain.
Have the sprocket replaced in this case.
Always t a new locking ring when replacing the
sprocket.
Maintaining the chain and run-down
brakes
The braking systems are very important safety fea-
tures. Like any other component of the chain saw, they
are subject to a certain degree of wear. They must be
inspected regularly by MAKITA authorized or factory
service centers. This measure is for your own safety.
Replacing carbon brushes
1
► 1. Limit mark
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.

18 ENGLISH
1
2
► 1. Brush holder cap 2. Screwdriver
Use a screwdriver to remove the brush holder caps.
Take out the worn carbon brushes, insert the new ones
and secure the brush holder caps.
After replacing brushes, plug in the tool and break
in brushes by running tool with no load for about 10
minutes.
Then check the tool while running and electric brake
operation when releasing the switch trigger.
If the electric brake is not working correctly, have the
tool repaired by a Makita Service center.
Storing tool
Biologically degradable saw chain oil can only be kept for a
limited period. Beyond two years after manufacture, biological
oils begin to acquire an adhesive quality, and cause damage
to the oil pump and components in the lubricating system.
— Before taking the chain saw out of service for a
longer period, empty the oil tank and ll it with a
small quantity of engine oil (SAE 30).
— Run the chain saw briey to ush all residue of the
biological oil out of the tank, lubricating system
and saw mechanism.
NOTE:
• When the chain saw is taken out of service,
small quantities of chain oil leaks from it for
some time afterwards. This is normal, and is not
a sign of a fault.
Store the chain saw on a suitable surface.
Before returning the chain saw to service, ll up with
fresh BIOTOP saw chain oil.
To maintain product SAFETY and RELIABILITY,
repairs, any other maintenance or adjustment should
be performed by Makita Authorized or Factory Service
Centers, always using Makita replacement parts.
TROUBLE SHOOTING
Before asking for repairs, conduct your own inspection
rst. If you nd a problem that is not explained in the
manual, do not attempt to dismantle the tool. Instead,
ask Makita Authorized or Factory Service Centers.
No oil on the chain.
Chain does not stop
even the chain brake is
engaged.
The tool vibrates
abnormally.
Malfunction status Possible cause Remedy
The chain saw does not
start.
Chain does not run.
Insufficient performance.
Cable defective.
Chain brake is engaged.
Carbon brush worn down.
Oil tank is empty.
Oil guide groove is dirty.
Oil pump adjusting screw
incorrectly adjusted.
Brake band worn down.
Loose guide bar or saw
chain.
No power supply.
Release chain brake.
Ask your local authorized service center for repair.
Fill the oil tank.
Clean the groove.
Adjust the oil pump feed rate.
Adjust the guide bar and saw chain tension.
Tool malfunction.
Tool malfunction.
Connect to the power supply.
Check the power supply.
Stop using the tool immediately, and ask your local
authorized service center.
Stop using the tool immediately, and ask your local
authorized service center.
Stop using the tool immediately, and ask your local
authorized service center.
Stop using the tool immediately, and ask your local
authorized service center.

19
OPTIONAL
ACCESSORIES
CAUTION:
• These accessories or attachments are recom-
mended for use with your Makita tool specied
in this manual. The use of any other accessories
or attachments might present a risk of injury to
persons. Only use accessory or attachment for
its stated purpose.
If you need any assistance for more details regard-
ing these accessories, ask your local Makita Service
Center.
• Saw chain
• Guide bar cover
• Guide bar
• Saw chain oil
NOTE:
• Some items in the list may be included in the
tool package as standard accessories. They
may di󰀨er from country to country.
MAKITA LIMITED WARRANTY
Please refer to the annexed warranty sheet for the
most current warranty terms applicable to this product.
If annexed warranty sheet is not available, refer to the
warranty details set forth at below website for your
respective country.
United States of America: www.makitatools.com
Canada: www.makita.ca
Other countries: www.makita.com
ENGLISH

20 FRANÇAIS
FRANÇAIS (Mode d’emploi original)
SPÉCIFICATIONS
Modèle UC3551A UC4051A
Vitesse maximale de la chaîne 14,5 m/s (47,6 ft/s) (870 m/min (2 900 ft/min))
Guide-chaîne standard Longueur du guide 350 mm (14") 400 mm (16")
Longueur de coupe 320 mm (12-5/8") 355 mm (14")
N° de pièce 165201-8 165202-6
Type de guide-chaîne Guide-chaîne à pignon de renvoi
Chaîne standard type 91PX
Pas 3/8"
Nombre de maillons d'entraînement 52 56
Longueur recommandée du guide-chaîne 350 mm (14"), 400 mm (16")
Longueur totale (sans guide-chaîne) 505 mm (19-7/8")
Poids net 5,5 kg (12,1lbs) 5,6 kg (12,3lbs)
• Étant donné l'évolution constante de notre programme de recherche et de développement, les spécications conte-
nues dans ce manuel sont sujettes à modication sans préavis.
• Les spécications peuvent varier suivant les pays.
• Poids conforme à la procédure EPTA du 01/2003
Consignes de sécurité générales
pour outils électriques
MISE EN GARDE Veuillez lire toutes les mises en
garde de sécurité et toutes les instructions. L'ignorance
des mises en garde et des instructions comporte un risque
de choc électrique, d'incendie et/ou de blessure grave.
Conservez toutes les mises en
garde et instructions pour réfé-
rence future.
Le terme « outil électrique » qui gure dans les avertissements fait
référence à un outil électrique branché sur une prise de courant
(par un cordon d'alimentation) ou alimenté par batterie (sans l).
Sécurité de la zone de travail
1. Maintenez la zone de travail propre et bien
éclairée. Les zones de travail encombrées ou
sombres ouvrent grande la porte aux accidents.
2. N'utilisez pas les outils électriques dans les
atmosphères explosives, par exemple en pré-
sence de liquides, gaz ou poussières inam-
mables. Les outils électriques produisent des
étincelles au contact desquelles la poussière ou
les vapeurs peuvent s'enammer.
3. Assurez-vous qu'aucun enfant ou curieux ne
s'approche pendant que vous utilisez un outil
électrique. Vous risquez de perdre la maîtrise de
l'outil si votre attention est détournée.
Sécurité en matière d'électricité
4.
Les ches d'outil électrique sont conçues pour
s'adapter parfaitement aux prises de courant. Ne
modiez jamais la che de quelque façon que ce
soit. N'utilisez aucun adaptateur de che sur les
outils électriques avec mise à la terre. En ne modi-
ant pas les ches et en les insérant dans des prises
de courant pour lesquelles elles ont été conçues vous
réduirez les risques de choc électrique.
5. Évitez tout contact corporel avec les surfaces
mises à la terre, telles que les tuyaux, radia-
teurs, cuisinières et réfrigérateurs. Le risque
de choc électrique est plus élevé si votre corps se
trouve mis à la terre.
6. N'exposez pas les outils électriques à la pluie
ou à l'eau. La présence d'eau dans un outil élec-
trique augmente le risque de choc électrique.
7. Ne maltraitez pas le cordon. N'utilisez jamais
le cordon pour transporter, tirer ou débrancher
l'outil électrique. Maintenez le cordon à l'écart
des sources de chaleur, de l'huile, des objets à
bords tranchants et des pièces en mouvement.
Le risque de choc électrique est plus élevé lorsque
les cordons sont endommagés ou enchevêtrés.
8.
Lorsque vous utilisez un outil électrique à l'exté-
rieur, utilisez un cordon prolongateur prévu à cette
n. Les risques de choc électrique sont moindres
lorsqu'un cordon conçu pour l'extérieur est utilisé.
9. Si vous devez utiliser un outil électrique dans
un endroit humide, utilisez une source d'ali-
mentation protégée par un disjoncteur de fuite
à la terre. L'utilisation d'un disjoncteur de fuite à la
terre réduit le risque de choc électrique.
Sécurité personnelle
10. Restez alerte, attentif à vos mouvements et
faites preuve de bon sens lorsque vous utili-
sez un outil électrique. Évitez d'utiliser un outil
électrique si vous êtes fatigué ou si vous avez
pris une drogue, de l'alcool ou un médicament.
Un moment d'inattention pendant l'utilisation d'un
outil électrique peut entraîner une grave blessure.
11. Portez des dispositifs de protection person-
nelle. Portez toujours un protecteur pour la
vue. Les risques de blessure seront moins élevés
si vous utilisez des dispositifs de protection tels
qu'un masque antipoussières, des chaussures à
semelle antidérapante, une coi󰀨ure résistante ou
une protection d'oreilles.