Stihl MS 400 C-M User manual

MS 400 C-M
Instruction Manual2 - 29

Contents
1 Introduction................................................. 2
2 Guide to Using this Manual.........................2
3 Overview..................................................... 2
4 Safety Precautions......................................4
5 Preparing the Saw for Operation.............. 10
6 Assembling the Saw................................. 11
7 Engaging and Disengaging the Chain Brake
.................................................................. 13
8 Mixing Fuel and Refueling the Chainsaw..13
9 Starting and Stopping the Engine............. 14
10 Checking the Saw..................................... 16
11 Operating the Saw.................................... 17
12 After Finishing Work..................................23
13 Transporting..............................................23
14 Storing.......................................................23
15 Cleaning....................................................23
16 Maintenance............................................. 25
17 Repairing...................................................26
18 Troubleshooting........................................ 26
19 Specifications............................................27
20 Bar and Chain Combinations.................... 28
21 Spare Parts and Accessories....................28
22 Disposal.................................................... 29
23 EC Declaration of Conformity................... 29
1 Introduction
Dear Customer,
Thank you for choosing STIHL. We develop and
manufacture our quality products to meet our
customers’ requirements. The products are
designed for reliability even under extreme con‐
ditions.
STIHL also stands for premium service quality.
Our dealers guarantee competent advice and
instruction as well as comprehensive service
support.
STIHL expressly commit themselves to a sus‐
tainable and responsible handling of natural
resources. This user manual is intended to help
you use your STIHL product safely and in an
environmentally friendly manner over a long
service life.
We thank you for your confidence in us and hope
you will enjoy working with your STIHL product.
Dr. Nikolas Stihl
IMPORTANT! READ BEFORE USING AND
KEEP IN A SAFE PLACE FOR REFERENCE.
2 Guide to Using this Manual
2.1 Symbols used with warnings in
the text
WARNING
■ This symbol indicates dangers that can cause
serious injuries or death.
► The measures indicated can avoid serious
injuries or death.
NOTICE
■ This symbol indicates dangers that can cause
damage to property.
► The measures indicated can avoid damage
to property.
2.2 Symbols in Text
This symbol refers to a chapter in this
instruction manual.
3 Overview
3.1 Chainsaw
18
17
15
16
13
27
25
19
12
11
910
76
0000-GXX-7201-A0
1
2
3
4
5
8
14
20
21222324
26
28
#
1 Front Hand Guard
Helps protect operator’s left hand from con‐
tact with the saw chain, serves to engage the
English
2 0458-788-0121-B
© ANDREAS STIHL AG & Co. KG 2021
0458-788-0121-B. VA3.K21.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Translation of Original Instruction Manual 0000008362_003_GB

chain brake and activates the chain brake by
inertia in certain kickback situations.
2 Muffler
Reduces chainsaw noise emissions.
3 Spiked Bumper
Toothed stop for holding saw steady against
wood while cutting.
4 Saw Chain
Cuts the wood.
5 Guide Bar
Supports and guides the saw chain.
6 Chain catcher
Reduces risk of operator contact with the
chain if it comes off the bar or breaks.
7 Tensioning Screw
Adjusts chain tension.
8 Chain Sprocket
Toothed wheel that drives the chain.
9 Chain Sprocket Cover
Covers the chain sprocket and secures the
guide bar to the chainsaw.
10 Nuts
Secure chain sprocket cover to the chainsaw.
11 Shroud
Covers the engine.
12 Shroud Lock
Secures shroud to chainsaw
13 Handlebar
For holding, controlling and carrying the
chainsaw.
14 Decompression Valve
Eases engine starts.
15 Spark Plug
Ignites fuel-air mixture in the engine.
16 Shutter
Serves to select summer or winter operating
mode.
17 Spark Plug Boot
Connects ignition lead to spark plug
18 Air filter
Filters the air entering the engine.
19 Throttle Trigger Lockout
Unlocks the throttle trigger.
20 Control Handle
For operating, holding and controlling the
chainsaw.
21 Rear Hand Guard
Protects operator’s right hand from contact
with the chain if it comes off the bar or
breaks.
22 Throttle Trigger
Controls engine speed.
23 Master Control Lever
For starting, running and stopping the engine.
24 Fuel Tank Cap
Closes the fuel tank.
25 Starter Grip
Serves to crank the engine.
26 Oil Pump Adjusting Screw
Serves to adjust chain oil feed rate.
27 Oil Tank Cap
Closes the oil tank.
28 Chain Scabbard
Helps protect user from contact with saw
chain.
# Serial Number
3.2 Symbols
Meanings of symbols that may be on the chain‐
saw:
This symbol marks the fuel tank.
This symbol marks the chain oil tank.
The chain brake is engaged or disen‐
gaged in this direction.
This symbol shows the direction of
rotation of the chain.
This symbol marks the oil pump adjust‐
ing screw and the chain oil feed rate.
Rotate in this direction to increase chain
tension.
Shutter is in winter mode in this position.
Shutter is in summer mode in this position.
This symbol marks the decompression
valve.
Master Control lever is moved in this direc‐
tion to stop the engine.
Master Control lever is moved to this posi‐
tion to stop the engine.
Engine is operated with the Master Control
lever in this position.
3 Overview English
0458-788-0121-B 3

Engine is started with the Master Control
lever in this position.
L
W
A
Guaranteed sound power level accord‐
ing to directive 2000/14/EC in dB(A) in
order to make sound emissions of
products comparable.
4 Safety Precautions
4.1 Warning Signs
Meanings of warning signs on the chainsaw:
Observe safety notices and take the
necessary precautions.
Read, understand and save the
instruction manual.
Wear safety glasses, hearing protec‐
tion and a hard hat.
Observe safety notices on kickback
and take the necessary precautions.
4.2 Intended Use
The STIHL MS 400 C-M chainsaw is designed
for cutting wood, limbing and felling trees.
WARNING
■Using the chainsaw for purposes for which it is
not designed may result in serious or fatal inju‐
ries and damage to property.
►Use the chainsaw as described in this
instruction manual.
4.3 The Operator
WARNING
■Users without adequate training or instruction
cannot recognize or assess the risks involved
in using the chainsaw. The user or other per‐
sons may sustain serious or fatal injuries.
► Read, understand and save the
instruction manual.
► If the chainsaw is passed on to another per‐
son: Always give them the instruction man‐
ual.
►Make sure the user meets the following
requirements:
–The user must be rested.
–The user must be in good physical con‐
dition and mental health to operate and
work with the chainsaw. If the user’s
physical, sensory or mental ability is
restricted, he or she may work only
under the supervision of or as instructed
by a responsible person.
–The user can identify and assess the
dangers of the chainsaw.
–The user must be of legal age or is
being trained in a trade under supervi‐
sion in accordance with national rules
and regulations.
–The user has received instruction from a
STIHL servicing dealer or other experi‐
enced user before working with the
chainsaw for the first time.
–The user must not be under the influ‐
ence of alcohol, medication or drugs.
► If the user is working with a chainsaw for
the first time: Practice cutting logs on a
sawhorse or other support.
►If you have any queries: Contact your
STIHL servicing dealer for assistance.
■ The chainsaw’s ignition system produces an
electromagnetic field. This field may interfere
with some pacemakers. This can result in seri‐
ous or fatal injuries.
►If the user has a pacemaker: Make sure the
pacemaker is not affected.
4.4 Clothing and Equipment
WARNING
■Long hair can become entangled in the saw
during operation. This can result in serious
injuries.
►Tie up long hair so that it is above shoulder
level.
■ Objects can be thrown through the air at high
speed during operation. This can result in per‐
sonal injury.
► Wear close-fitting safety glasses.
Suitable safety glasses that have
been tested and labeled in accord‐
ance with EN 166 or national stand‐
ards are available from retailers.
►STIHL recommends that you wear a face
shield.
► Wear a long-sleeved, snug-fitting upper
garment.
■ Noise occurs during operation. Noise can
harm your hearing.
► Wear hearing protection.
English 4 Safety Precautions
4 0458-788-0121-B

■ Falling objects can cause head injuries.
► If there is a danger of falling objects
during operation: Wear a safety hard
hat.
■ Dust can be whipped up during operation:
Whipped up dust can damage the respiratory
passages and cause allergic reactions.
►If dust is whipped up and forms a cloud:
Wear a dust respirator mask.
■ Inappropriate clothing can snag on wood,
brush or the saw. Not wearing suitable cloth‐
ing may result in serious injury.
►Wear snug-fitting clothing.
► Do not wear a scarf or jewelry.
■ The user can come into contact with the rotat‐
ing saw chain during operation. This can result
in serious injuries.
►Wear long trousers with cut-retardant
inserts.
■ The user can be cut by the wood during oper‐
ation. The user can come into contact with the
saw chain during cleaning and maintenance
work. This can result in personal injury.
►Wear work gloves made of durable mate‐
rial.
■ Wearing unsuitable footwear may cause you
to slip or stumble. Contact with the rotating
saw chain can result in cuts. This can result in
personal injury.
►Wear chainsaw boots with cut retardant
inserts.
4.5 Work Area and Surroundings
WARNING
■Bystanders, children and animals are not
aware of the dangers of the chainsaw or
thrown objects. Innocent bystanders, children
and animals may be seriously injured and
damage to property may occur.
►Keep bystanders, children and animals
away from the work area.
► Do not leave the chainsaw unattended.
► Make sure that children cannot play with
the chainsaw.
■ Hot exhaust gas is emitted through the muffler
while the engine is running. Hot exhaust gas
can ignite easily flammable materials and
cause a fire.
►Keep exhaust gas well away from easily
flammable materials.
4.6 Safe Condition
4.6.1 Chainsaw
The chainsaw is in a safe condition if the follow‐
ing points are observed:
–The chainsaw is not damaged.
–There is no fuel leaking from the chainsaw.
–The fuel tank and oil tank caps are closed.
–The chainsaw is clean.
–The chain catcher is fitted and undamaged.
–The chain brake is operating properly.
–The controls function properly and have not
been modified.
–The chain lubrication is operating properly.
–Wear marks on the chain sprocket are not
deeper than 0.5 mm.
–A combination of guide bar and saw chain rec‐
ommended in this User Manual is mounted.
–The guide bar and saw chain are properly
mounted.
–The saw chain is properly tensioned.
–Only original STIHL accessories designed for
this chainsaw model are fitted.
–The accessories are correctly attached.
WARNING
■ If not in safe condition, components may no
longer operate correctly, safety devices may
be disabled and fuel leakage may occur. This
may result in serous or fatal injury to people.
►Work only with an undamaged chainsaw.
► If fuel is leaking from the chainsaw: Do not
use the chainsaw and contact a STIHL
dealer for assistance.
►Close the fuel tank and oil tank caps.
► If the chainsaw is dirty: Clean the chainsaw.
► Work only with property fitted and undam‐
aged chain catcher.
► Never modify your chainsaw. Exception:
Mounting a combination of guide bar and
saw chain recommended in this User Man‐
ual.
►If the controls do not function properly: Do
not use your chainsaw.
► Only fit original STIHL accessories
designed for this chainsaw model.
► Mount the guide bar and saw chain as
described in this User Manual.
► Attach accessories as described in this
User Manual or in the User Manual for the
accessories.
►Never insert objects in the chainsaw’s
openings.
► Replace worn or damaged labels.
► If you have any doubts, be sure to consult a
STIHL dealer.
4 Safety Precautions English
0458-788-0121-B 5

4.6.2 Guide Bar
The guide bar is in a safe condition if the follow‐
ing points are observed:
–Guide bar is not damaged.
–Guide bar is not deformed.
–The minimum groove depth is maintained,
19.3.
–Bar rails are free from burrs.
–Bar groove is not pinched or splayed.
WARNING
■ If the guide bar is not in a safe condition, it can
no longer support and guide the saw chain
properly. The rotating saw chain can jump off
the guide bar. This can result in serious or
fatal injuries.
►Work only with an undamaged guide bar.
► If the groove depth is less than the mini‐
mum depth: Mount a new guide bar.
► Deburr the guide bar every week.
► If you have any queries: Contact your
STIHL servicing dealer.
4.6.3 Saw Chain
The saw chain is in a safe condition if the follow‐
ing points are observed:
–Chain is not damaged.
–Chain is properly sharpened.
–The service marks on the cutters are still visi‐
ble.
WARNING
■If components do not comply with safety
requirements, they will no longer function
properly and safety devices may be rendered
inoperative. This can result in serious or fatal
injuries.
►Work only with an undamaged saw chain.
► Sharpen the chain properly.
► If you have any queries: Contact your
STIHL servicing dealer for assistance.
4.7 Fuel Mixture and Refueling
WARNING
■This chainsaw requires a fuel mixture of gaso‐
line and two-stroke engine oil. Fuel mixture
and gasoline are extremely flammable. If fuel
mixture or gasoline make contact with open
fire or hot objects, they can cause a fire or
explosion. This can result in serious or fatal
injuries and damage to property.
►Protect fuel mixture and gasoline from heat
and fire.
► Do not spill fuel mixture and gasoline.
► If fuel has been spilled: Wipe up the fuel
with a cloth and do not attempt to start the
engine until all parts of the saw and the
area around it are dry.
►Do not smoke.
► Never refuel near a fire.
► Shut off the engine and allow it to cool
down before refueling.
► Start the engine at least 3 meters from the
fueling spot, outdoors only.
■ Inhaling fuel fumes and gasoline fumes can
have toxic effects.
► Avoid inhaling fuel fumes or gasoline
fumes.
► Refuel in a well-ventilated location.
■ The chainsaw becomes hot during operation,
or in a very hot environment. Depending on
the type of fuel, altitude, ambient temperature
and the temperature of the saw, the fuel
expands and can cause a pressure build-up in
the tank. Fuel may escape as a spray and
ignite when the fuel tank cap is opened. This
can result in serious injuries and damage to
property.
► Allow the saw to cool down before opening
the tank cap.
► Open the tank cap slowly in stages.
■ Clothing that has been in contact with fuel or
gasoline is more easily flammable. This can
result in serious or fatal injuries and damage
to property.
►If your clothing comes into contact with fuel
or gasoline: Change your clothing.
■ Fuel mix, gasoline and two-stroke engine oil
can harm the environment.
► Do not spill fuel, gasoline or two-stroke
engine oil.
► Dispose of fuel mix, gasoline and two-
stroke engine oil in accordance with local
regulations and environmental require‐
ments.
■Fuel, gasoline or two-stroke engine oil can
cause irritation if they come into direct contact
with the skin or eyes.
►Avoid contact with fuel, gasoline and two-
stroke engine oil.
► In case of contact with the skin: Wash
affected areas with plenty of water and
soap.
►In case of contact with the eyes: Rinse eyes
with plenty of water for at least 15 minutes
and seek medical advice.
■The saw’s ignition system produces sparks.
Unconfined sparks may cause a fire or an
explosion in an easily combustible or explo‐
English 4 Safety Precautions
6 0458-788-0121-B

sive environment. This can result in serious or
fatal injuries and damage to property.
► Use the spark plugs described in this
instruction manual.
► Insert and tighten down the spark plug.
► Connect the spark plug boot and press it
down firmly.
■ The saw can be damaged if it is run on a fuel
mixture consisting of unsuitable gasoline or an
unsuitable two-stroke engine oil or if an incor‐
rect mix ratio of gasoline and two-stroke
engine oil is used.
►Mix the fuel as described in this instruction
manual.
■ The mixture of gasoline and two-stroke engine
oil can separate if it is stored for a long period.
The saw can be damaged if it is used with a
fuel mix that has separated.
►Before refueling the saw: Thoroughly mix
the fuel.
► Use a mixture of gasoline and two-stroke
engine oil that is not older than 30 days
(STIHL MotoMix: 2 years).
4.8 Working
4.8.1 Sawing
WARNING
■Always work within calling distance of others
in case help is needed.
► Make sure than persons outside the work
area are within calling distance.
■ If the engine is not started properly, the user
may lose control of the chainsaw. This can
result in serious injuries.
►Start the engine as described in this instruc‐
tion manual.
► If the saw chain is touching the ground or
objects: Do not start the engine.
■ The user cannot concentrate on the work in
certain situations. The user can lose control of
the saw, trip or fall and be seriously injured.
►Work calmly and carefully.
► If light and visibility are poor: Do not use
your saw.
► Operate the chainsaw alone.
► Do not work above shoulder height.
► Watch out for obstacles.
► Stand on the ground while working and
keep a good balance. If it is necessary to
work at heights: Use a lift bucket or a safe
platform.
►If you begin to feel tired: Take a break.
■ Exhaust gas is produced when the engine is
running. Breathing in exhaust gas can have
toxic effects.
►Avoid inhaling exhaust gas.
► Operate the chainsaw is a well ventilated
location.
► In the event of nausea, headache, visual
disturbances, problems with hearing or diz‐
ziness: Stop work and seek medical advice.
■The user’s ability to hear and assess noises is
restricted when wearing hearing protection
with the engine running.
►Work calmly and carefully.
■ The user will not be able to control the chain‐
saw properly if it is operated with the Master
Control lever in position . This can result in
serious injuries.
►Move the Master Control lever to position .
► Start the engine as described in this instruc‐
tion manual.
■ Do not accelerate the engine with the chain
brake engaged since this can damage the
chain brake.
►Disengage the chain brake before you start
cutting.
■ The rotating saw chain can cut the operator.
This can result in serious injuries.
► Do not touch the rotating saw chain.
► If the saw chain is blocked by an object:
Shut off the engine and engage the chain
brake. Then remove the object causing the
blockage.
■The rotating chain becomes hot and expands.
If the chain is not lubricated sufficiently and
retensioned, it can come off the guide bar or
break. This can result in serious injuries and
damage to property.
►Use special chain oil.
► Check chain tension regularly during cutting
work. If chain tension is insufficient: Ten‐
sion the chain.
■If the behavior of the saw changes during
operation or feels unusual, it may no longer be
in a safe condition. This can result in serious
injuries and damage to property.
►Stop work and contact your STIHL dealer
for assistance.
■ Saw vibrations may occur during operation.
► Wear gloves.
► Take regular breaks.
► If signs of circulation problems occur: Seek
medical advice.
■ Sparks may occur if the rotating chain makes
contact with a hard object. Sparks may cause
4 Safety Precautions English
0458-788-0121-B 7

a fire in an easily combustible location. This
can result in serious or fatal injuries and dam‐
age to property.
►Do not work in an easily combustible loca‐
tion.
■ Note that the saw chain continues to rotate for
a short period after you release the trigger.
The rotating saw chain can cut the user. This
can result in serious injuries.
►Wait for the chain to come to a standstill.
0000-GXX-1245-A0
1
21
2
WARNING
■ The guide bar can be pinched when cutting
wood that is under tension. The user can lose
control of the saw and be seriously injured.
►Make a relieving cut in the compression
side (1) first, then perform bucking cut at
the tension side (2).
4.8.2 Limbing
WARNING
■If the underside of the felled tree is limbed
first, it will no longer be supported on the
ground by branches. The tree can move dur‐
ing cutting work. This can result in serious or
fatal injuries.
►Cut through large limbs on the underside of
the tree only after it has been bucked.
► Do not stand on the log while limbing it.
■ A branch may fall to the ground during limbing.
The user may trip, fall or be seriously injured.
► Limb from the base to the crown of the tree.
4.8.3 Felling
WARNING
■Inexperienced users cannot assess the dan‐
gers of felling a tree. This can result in serious
or fatal injuries and damage to property.
►If you have any queries: Do not fell the tree
yourself.
■ A tree and branches can fall on bystanders or
objects during the felling operation. This can
result in serious or fatal injuries and damage
to property.
►Determine direction of fall so that the area
in which the tree falls is clear.
► Do not allow bystanders, children or ani‐
mals within 2.5 tree lengths of the felling
site.
►Remove broken or dead branches from the
tree crown before felling.
► If broken or dead branches cannot be
removed from the crown: Do not fell the
tree.
►Observe tree crown and crowns of neigh‐
boring trees and keep clear of falling
branches.
■When the tree falls the trunk can break or
spring back in the direction of the user. This
can result in serious or fatal injuries.
►Plan an escape path sideways behind the
tree.
► Walk backwards along the escape path and
observe the falling tree.
► Do not walk backwards down slopes.
■ Obstacles in the work area and on the escape
path can hinder the user. The user may trip
and fall. This can result in serious or fatal inju‐
ries.
►Remove all obstacles from the work area
and escape path.
■ If you cut into or through the hinge, stabilizing
strap or holding strap too soon, the intended
direction of fall cannot be controlled or the tree
can fall prematurely. This can result in serious
or fatal injuries and damage to property.
►Do not cut into or through the hinge.
► Cut through the stabilizing strap or holding
strap last.
► If the tree begins to fall too soon: Abandon
the felling cut and retreat along the escape.
■ Kickback can occur if the rotating chain in the
upper quadrant of the bar nose makes contact
with a hard felling wedge and is suddenly
braked. This can result in serious or fatal inju‐
ries.
►Use aluminum or plastic felling wedges.
■ If the tree does not fall all the way to the
ground or gets caught on another tree, the
operator cannot finish the operation in a con‐
trolled manner.
►Stop the felling operation and use a cable
winch or suitable vehicle to pull the tree to
the ground.
English 4 Safety Precautions
8 0458-788-0121-B

4.9 Reactive Forces
4.9.1 Kickback
0000-GXX-2732-A0
Kickback can be caused for the following rea‐
sons:
–The rotating saw chain in the upper quadrant
of the bar nose makes contact with a hard
object and is suddenly braked.
–The rotating saw chain is pinched at the bar
nose.
The chain brake cannot prevent kickback.
WARNING
0000-GXX-4119-A0
■If kickback occurs, the saw can be thrown up
in the direction of the operator. The operator
can lose control of the saw and be seriously or
fatally injured.
►Hold the saw firmly with both hands.
► Always keep your body out of the plane of
the cutting attachment.
► Use the working techniques described in
this instruction manual.
► Do not cut with the upper quadrant of the
bar nose.
► Always cut with a properly sharpened and
tensioned saw chain.
► Use a reduced kickback saw chain.
► Use a guide bar with a narrow radius nose.
► Always cut with the chain running at full
speed.
4.9.2 Pull-in
0000-GXX-1348-A0
The saw is pulled away from the operator when
the bottom of the bar is used for cutting.
WARNING
■ If the rotating chain makes contact with a hard
object and is suddenly pinched, the saw is
abruptly jerked away from the operator. The
operator can lose control of the saw and be
seriously or fatally injured.
►Hold the saw firmly with both hands.
► Operate the saw as described in this
instruction manual.
► Keep the guide bar straight in the cut.
► Apply the spiked bumper properly.
► Always cut with the chain running at full
speed.
4.9.3 Pushback
0000-GXX-1349-A0
The saw is pushed back toward the operator
when the top of the bar is used for cutting.
WARNING
■If the rotating chain makes contact with a hard
object and is suddenly pinched, the saw can
be abruptly pushed back toward the operator.
The operator can lose control of the saw and
be seriously or fatally injured.
►Hold the saw firmly with both hands.
► Operate the saw as described in this
instruction manual.
► Keep the guide bar straight in the cut.
► Always cut with the chain running at full
speed.
4 Safety Precautions English
0458-788-0121-B 9

4.10 Transporting
WARNING
■The saw may turn over or shift during trans‐
port. This can result in serious injuries and
damage to property.
►Shut off the engine.
► Engage the chain brake.
► Fit the scabbard so that it completely cov‐
ers the guide bar.
► Secure the chainsaw with lashing straps or
a net to prevent it turning over and moving.
0000-GXX-2733-A0
■The muffler and engine may be hot after a
period of operation. There is a risk of burn
injuries.
►Carry the saw by holding the front handle in
your right hand with the guide bar pointing
to the rear.
4.11 Storing
WARNING
■Children are not aware of and cannot assess
the dangers of a chainsaw and can be seri‐
ously injured.
►Shut off the engine.
► Engage the chain brake.
► Fit the scabbard so that it completely cov‐
ers the guide bar.
► Store the saw out of the reach of children.
■ Dampness can corrode the electrical contacts
on the saw and metal components. This can
damage the saw.
►Store the saw in a clean and dry condition.
4.12 Cleaning, Maintenance and
Repair
WARNING
■The saw chain can start up unintentionally if
the engine is running during cleaning, mainte‐
nance or repair operations. This may result in
serious injury to people and damage to prop‐
erty.
►Shut off the engine.
► Engage the chain brake.
■ The muffler and engine may be hot after a
period of operation. This can result in burn
injuries.
►Wait until the muffler and engine cool down.
■ Aggressive cleaning agents, a water jet or
pointed objects can damage the chainsaw,
guide bar and saw chain. If the chainsaw,
guide bar or saw chain are not cleaned cor‐
rectly, components may no longer function
properly or safety devices may be rendered
inoperative. They may cause serious injury to
persons.
► Clean the chainsaw, guide bar and saw
chain as described in this user manual.
■ If the chainsaw is not maintained as described
in this user manual, components may no lon‐
ger function properly or safety devices may be
rendered inoperative. This may result in
serous or fatal injury to people.
►Service or repair the chainsaw as described
in this user manual.
■ If the guide bar and saw chain are not main‐
tained or repaired as described in this user
manual, components may no longer function
properly or safety devices may be rendered
inoperative. They may cause serious injury to
persons.
►Service or repair the guide bar and saw
chain as described in this User Manual.
■ The user may be cut by the sharp cutters
while cleaning or servicing the saw chain. This
may result in injury to the user.
►Wear work gloves made from resistant
material.
5 Preparing the Saw for
Operation
5.1 Preparing the Saw for Opera‐
tion
Perform the following steps before starting work:
► Make sure the following components are in a
safe condition:
–Chainsaw, 4.6.1.
–Guide bar, 4.6.2.
–Saw chain, 4.6.3.
►Clean the saw, 15.1.
►Mount the bar and chain, 6.1.1.
►Tension the saw chain, 6.2.
►Fill up with chain oil, 6.3.
►Check the chain brake, 10.4.
►Refuel the saw, 8.2.
►Check the controls, 10.5.
►Check chain lubrication, 10.6.
English 5 Preparing the Saw for Operation
10 0458-788-0121-B

► If you cannot carry out these steps: Do not use
your chainsaw and contact your STIHL servic‐
ing dealer for assistance.
6 Assembling the Saw
6.1 Mounting and Removing the
Bar and Chain
6.1.1 Mounting the Bar and Chain
The bar and chain combinations that can be
used with the chain sprocket are listed in the
specifications, 20.1.
► Shut off the engine and engage the chain
brake.
3
0000-GXX-2734-A0
2
4
1
► Rotate the nuts (1) counterclockwise until the
chain sprocket cover (2) can be removed.
► Remove the chain sprocket cover (2).
► Turn the tensioning screw (3) counterclock‐
wise until the tensioner slide (4) butts against
the left end of the housing.
0000-GXX-2954-A0
► Fit the chain in the bar groove so that the
arrows on the tie straps on the top of the bar
point in the direction of rotation.
0000-GXX-2735-A0
7
► Fit the guide bar and chain on the saw and
check the following points:
–Chain drive links are seated in teeth of
chain sprocket (7).
–Collar studs (5) are located in slot in tail of
guide bar (6).
–Peg of tensioner slide (4) engages hole (8)
in guide bar (6).
The guide bar (6) may be either way round. The
logo on the guide bar (6) may also be upside
down.
► Disengage the chain brake.
0000-GXX-2928-A0
► Turn the tensioning screw (3) clockwise until
the chain fits snugly against the bar. Make
sure the drive link tangs engage the bar
groove.
The guide bar (6) and chain are seated
against the saw.
► Fit the sprocket cover (2) so that it is flush with
the saw.
► Fit and tighten down the nuts (1) firmly.
6.1.2 Removing the Bar and Chain
► Shut off the engine and engage the chain
brake.
► Rotate the nuts counterclockwise until the
chain sprocket cover can be removed.
► Remove the sprocket cover.
► Turn the tensioning screw counterclockwise as
far as stop.
The chain is now slack.
► Remove the bar and chain.
6.2 Tensioning the Saw Chain
The saw chain expands or contracts during cut‐
ting work. Chain tension changes as a result.
Check chain tension regularly during operation
and readjust if necessary.
► Shut off the engine and engage the chain
brake.
6 Assembling the Saw English
0458-788-0121-B 11

2
11
0000-GXX-2929-A1
a
► Loosen the nuts (1).
► Disengage the chain brake.
► Hold the bar nose up and turn the tensioning
screw (2) clockwise until the following points
apply:
–Chain sag ‘a’ in the center of the bar is 1 - 2
mm.
–The chain can still be pulled easily along the
bar with two fingers.
► Keep holding the bar nose up and tighten
down the nuts (1) firmly.
► If chain sag ‘a’ in the center of the bar is not 1
- 2 mm: Readjust chain tension.
6.3 Filling Up with Chain Oil
Chain oil lubricates and cools the rotating chain.
► Shut off the engine and engage the chain
brake.
► Place your saw on a level surface so that the
oil tank cap faces up.
► Use a damp cloth to clean the tank cap and
the area around it.
0000-GXX-2930-A0
► Swing the grip on the oil tank cap to the verti‐
cal position.
► Turn the oil tank cap counterclockwise as far
as stop.
► Remove the oil tank cap.
► Fill up with chain oil, taking care not to spill
any oil and do not overfill the tank.
► If the grip on the oil tank cap has dropped into
the closed position: Raise the grip until it is
vertical.
23
1
0000-GXX-2931-A0
1
► Place the cap in the filler opening so that mark
(1) lines up with mark (2).
► Press the cap down and rotate it clockwise as
far as stop.
The cap snaps into place. The mark (1) points
to mark (3),
► Check to see if the oil tank cap can be pulled
upwards and off.
► If the oil tank cap cannot be pulled upwards
and off: Fold down the grip on the oil tank cap.
The oil tank is closed.
If the oil tank cap can be pulled upwards and off,
perform the following steps:
► Place the oil tank cap in the filler opening – in
any position.
1
0000-GXX-3135-A0
2
► Press the cap down and rotate it clockwise as
far as stop.
► Press the cap down and rotate it counterclock‐
wise until mark (1) points to mark (2).
► Now try again to close the oil tank.
► If the oil tank still cannot be closed properly:
Do not use the chainsaw and contact a STIHL
dealer for assistance.
The chainsaw is not in a safe condition.
6.4 Mounting the Spiked Bumper
2
1
3
4
0000-GXX-3823-A0
English 6 Assembling the Saw
12 0458-788-0121-B

► Place the spiked bumper (1) in position.
► Fit the screw (2).
► Insert screw (3) through spiked bumper and
nut (4).
► Tighten down the screws (2) and (3) firmly.
The spiked bumper (1) must not be removed.
7 Engaging and Disengaging
the Chain Brake
7.1 Engaging the Chain Brake
The saw is equipped with a chain brake.
The chain brake is activated by the inertia of the
front hand guard if the kickback force is high
enough or can be engaged by the operator.
0000-GXX-2932-A0
► Push the hand guard away from the front han‐
dle with your left hand.
The hand guard engages with an audible click.
The chain brake is engaged.
7.2 Disengaging the Chain Brake
0000-GXX-2933-A0
► Pull the hand guard toward the front handle
with your left hand.
The hand guard engages with an audible click.
The chain brake is disengaged.
8 Mixing Fuel and Refueling
the Chainsaw
8.1 Mixing Fuel
This chainsaw requires a fuel mixture of gasoline
and two-stroke engine oil in a ratio of 50:1.
STIHL recommends you use STIHL MotoMix.
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil in accordance with JASO FB, JASO
FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-
EGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
throughout the machine’s service life.
► Make sure that the octane number of the gas‐
oline is at least 90 RON and the ethanol con‐
tent is not more than 10%.
► Make sure the two-stroke engine oil you are
using meets the requirements.
► Depending on the required amount of fuel,
determine the correct amounts of two-stroke
engine oil and gasoline in a mix ratio of 50:1.
Examples for fuel mixes:
–1 liter gasoline, 20 ml two-stroke engine oil
–3 liters gasoline, 60 ml two-stroke engine oil
–5 liters gasoline, 100 ml two-stroke engine
oil
► Pour two-stroke engine oil into a clean
approved fuel canister first and then add gaso‐
line.
► Thoroughly mix the fuel.
8.2 Fueling the Saw
► Shut off the engine and engage the chain
brake.
► Allow chainsaw to cool down.
► Place your chainsaw on a level surface so that
the fuel tank cap faces up.
► Use a damp cloth to clean the tank cap and
the area around it.
► Swing the grip on the fuel tank cap to the verti‐
cal position.
0000-GXX-2934-A1
7 Engaging and Disengaging the Chain Brake English
0458-788-0121-B 13

WARNING
■ The chainsaw becomes hot during operation,
or in a very hot environment. Depending on
the type of fuel, altitude, ambient temperature
and the temperature of the saw, the fuel
expands and can cause a pressure build-up in
the tank. Fuel may escape as a spray and
ignite when the fuel tank cap is opened. This
can result in serious injuries and damage to
property.
► Allow the saw to cool down before opening
the tank cap.
► Open the tank cap slowly in stages.
► Turn the fuel tank cap about 1/8 of a turn
counterclockwise.
If the fuel tank is under pressure, you will hear
pressure being released.
► When the tank is no longer under pressure:
Turn the tank cap counterclockwise until the
marks on the cap and fuel tank are in align‐
ment.
► Remove the fuel tank cap.
NOTICE
■ Bright light, sunlight and extreme tempera‐
tures can cause the fuel mix to separate much
faster. The saw can be damaged if it is used
with a fuel mix that has become separated.
►Thoroughly mix the fuel.
► Do not use fuel mix that has been stored for
more than 30 days.
► Fill the tank to within no more than 15 mm
of the brim, taking care not to spill any fuel.
► If the grip on the fuel tank cap has dropped
into the closed position: Raise the grip until it
is vertical.
23
1
0000-GXX-2935-A1
14
► Place the cap in the filler opening so that mark
(1) lines up with mark (2).
► Press the cap down and rotate it clockwise as
far as stop.
The cap snaps into place. The mark (1) is in
line with mark (4) and points to mark (3).
► Check to see if the fuel tank cap can be pulled
upwards and off.
► If the fuel tank cap cannot be pulled upwards
and off: Fold the grip flush with the top of the
cap.
The fuel tank is closed.
If the fuel tank cap can be pulled upwards and
off, perform the following steps:
► Place the fuel tank cap in the filler opening – in
any position.
0000-GXX-3136-A1
1
2
ABC
► Press the cap down and rotate it clockwise as
far as stop.
► Press the cap down and rotate it counterclock‐
wise until mark (1) points to mark (2).
► Now try again to close the fuel tank.
► If the fuel tank still cannot be closed properly:
Do not use the chainsaw and contact a STIHL
dealer for assistance.
The chainsaw is not in a safe condition.
9 Starting and Stopping the
Engine
9.1 Starting the Engine
0000-GXX-7202-A0
3
1
2
► Engage the chain brake (2).
► Pull off the chain guard (scabbard).
► Depress the decompression valve (1).
► Move the Master Control lever (3) to posi‐
tion .
English 9 Starting and Stopping the Engine
14 0458-788-0121-B

► If the engine is at ambient temperature:
3
5
0000-GXX-7203-A0
4
► Depress the throttle trigger lockout (5) and
hold it there.
► Pull the throttle trigger (4) and hold it there.
► Move the Master Control lever (3) to position
and hold it there.
► Release the throttle trigger (4) and lockout
lever (5).
The Master Control lever (3) engages in posi‐
tion .
0000-GXX-2936-A0
► Hold the chainsaw firmly in one of three ways:
–Place the saw on level ground. Hold the
saw firmly on the ground with your left hand
on the handlebar – your thumb should be
under the handle. Put the toe of your right
boot into the rear handle and press down.
–Place the saw on level ground. Hold the
saw firmly on the ground with your left hand
on the handlebar – your thumb should be
under the handle. Put the heel of your right
boot into the rear handle and press down.
–Hold the saw firmly with your left hand on
the handlebar – your thumb should be under
the handle. Hold the rear handle tightly
between your legs, just above the knees.
0000-GXX-2937-A0
► Pull the starter grip slowly with your right hand
until you feel it engage.
► Pull the starter grip quickly and allow the
starter rope to rewind several times until the
engine runs.
►If the Master Control lever (3) is in position .
Briefly depress the lockout lever (4) and blip
the throttle trigger (5).
The Master Control lever springs to position .
The engine runs at idling speed.
NOTICE
■ Do not accelerate the engine with the chain
brake engaged since this can damage the
chain brake.
►Disengage the chain brake before you start
cutting.
► Disengage the chain brake.
Your saw is ready for operation.
► If the saw chain rotates while the engine is
idling:
► Shut off the engine and engage the chain
brake.
► Do not use the chainsaw and contact your
STIHL servicing dealer for assistance.
The saw has a malfunction.
► If the engine does not start: Move the Master
Control lever (3) to position and try again to
start the engine.
9.2 Stopping the Engine
1
0000-GXX-7204-A0
2
► Release the throttle trigger (2).
The engine runs at idling speed.
► Move the Master Control lever (1) to posi‐
tion .
The engine stops and the Master Control lever
(1) springs back to position .
► If the engine does not stop:
► Move the Master Control lever to posi‐
tion .
The engine stops.
► Do not use the chainsaw and contact your
STIHL servicing dealer for assistance.
The saw has a malfunction.
9 Starting and Stopping the Engine English
0458-788-0121-B 15

10 Checking the Saw
10.1 Checking the Chain Sprocket
► Shut off the engine.
► Disengage the chain brake.
► Remove the chain sprocket cover.
► Remove the bar and chain.
0000-GXX-3162-A0
a
► Use a STIHL gauge to check the wear marks
on the sprocket.
► If wear marks are deeper than a = 0.5 mm: Do
not use your chainsaw and contact your
STIHL servicing dealer for assistance.
The chain sprocket must be replaced.
10.2 Checking the Guide Bar
► Shut off the engine and engage the chain
brake.
► Remove the chain and guide bar.
0000-GXX-1217-A0
► Measure depth of bar groove with scale on
STIHL filing gauge.
► Install a new guide bar if one of the following
points applies:
–Guide bar is damaged.
–Measured bar groove depth is less than
specified minimum depth, 19.3.
–Bar groove is pinched or splayed.
► If you have any queries: Contact your STIHL
servicing dealer for assistance.
10.3 Checking the Saw Chain
► Shut off the engine and engage the chain
brake.
1
0000-GXX-1218-A0
2
► Use a STIHL filing gauge (2) to check the
height of the depth gauges (1). The STIHL fil‐
ing gauge must match the chain pitch.
► If a depth gauge (1) projects from the filing
gauge (2): Lower the depth gauge (1), 16.3.
0000-GXX-1372-A0
1
23
4
► Make sure the service marks (1 to 4) on the
cutters are visible.
► If one of the service marks is not visible on a
cutter: Do not use your chainsaw and contact
your STIHL servicing dealer for assistance.
► Use a STIHL filing gauge to check that a filing
angle of 30° has been maintained on all cut‐
ters. The STIHL filing gauge must match the
chain pitch.
► If a filing angle of 30° has not been main‐
tained: Resharpen the saw chain.
► If you have any queries: Contact your STIHL
servicing dealer for assistance.
10.4 Testing the Chain Brake
► Shut off the engine and engage the chain
brake.
WARNING
■ The chain's cutters are very sharp. There is a
risk of cut injuries.
► Wear work gloves made of durable mate‐
rial.
► Try to pull the chain along the guide bar by
hand.
If the chain cannot be pulled along the bar by
hand, the chain brake is functioning.
English 10 Checking the Saw
16 0458-788-0121-B

► If the chain can be pulled along the bar by
hand: Do not use your chainsaw and contact
your STIHL servicing dealer for assistance.
The chain brake is defective.
10.5 Checking the Controls
Throttle trigger lockout and throttle trigger
► Shut off the engine and engage the chain
brake.
► Attempt to pull the trigger without depressing
the lockout lever.
► If the trigger can be pulled: Do not use your
chainsaw and contact your STIHL servicing
dealer for assistance.
There is a malfunction in the throttle trigger
lockout.
► Press down the throttle trigger lockout and
hold it there.
► Pull the throttle trigger and release it again.
► If the throttle trigger is stiff or does not spring
back to its idle position: Do not use your chain‐
saw and contact your STIHL servicing dealer
for assistance.
The throttle trigger is defective.
Stopping the Engine
► Start the engine.
►Move the Master Control lever to position .
The engine stops and the Master Control lever
springs back to position .
► If the engine does not stop:
► Move the Master Control lever to posi‐
tion .
The engine stops.
► Do not use your chainsaw and contact your
STIHL servicing dealer for assistance.
Your saw has a malfunction.
10.6 Checking Chain Lubrication
► Start the engine and disengage the chain
brake.
► Hold the guide bar over a light surface.
► Open the throttle.
Chain oil is thrown off the chain and is visible
on the light surface. Chain lubrication is oper‐
ating properly.
► If no chain oil can be seen:
► Shut off the engine.
► Fill up with chain oil.
► Check chain lubrication again.
► If chain oil is still not visible on the light sur‐
face: Do not use your chainsaw and contact
your STIHL servicing dealer for assistance.
Chain lubrication is defective.
11 Operating the Saw
11.1 Winter Operation
The carburetor may ice up if the engine is oper‐
ated at temperatures below +10°C. The shutter
must be set to the winter mode so that the carbu‐
retor is additionally heated by warm air from
around the engine.
NOTICE
■ The engine may overheat if is operated in the
winter mode at temperatures above +10°C.
► Change setting to summer mode.
► Shut off the engine and engage the chain
brake.
0000-GXX-7205-A0
3
1 1
► Rotate the shroud fasteners (1) a quarter turn
counterclockwise.
► Remove the shroud (2).
► Pull out the shutter (3).
0000-GXX-7206-A0
33
4
► Hold the shutter (3) so that the lug (4) points to
the winter symbol.
► Push the shutter (3) into the guide as far as
stop.
You will feel it engage.
► Place the shroud (2) in position.
► Rotate the shroud fasteners (1) clockwise until
you hear a click.
The shroud fasteners (1) are locked.
11.2 Summer Operation
The shutter must be set to summer mode when
working at temperatures above +10°C.
► Shut off the engine and engage the chain
brake.
11 Operating the Saw English
0458-788-0121-B 17

0000-GXX-7207-A0
3
1 1
► Rotate the shroud fasteners (1) a quarter turn
counterclockwise.
► Remove the shroud (2).
► Pull out the shutter (3).
0000-GXX-7208-A0
3
3
4
► Hold the shutter (3) so that the lug (4) points to
the summer symbol.
► Push the shutter (3) into the guide as far as
stop.
You will feel it engage.
► Place the shroud (2) in position.
► Rotate the shroud fasteners (1) clockwise until
you hear a click.
The shroud fasteners (1) are locked.
11.3 Calibrating the Saw
The chainsaw adjusts itself automatically for opti‐
mum performance during operation. Calibration
enables the saw to be adjusted faster for opti‐
mum performance.
► If the outside temperature is below -10°C or
the engine is cold:
► Start the engine and disengage the chain
brake.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
► Shut off the engine.
1
min
AB C
s> 30 s30-60 s
0000-GXX-3825-A0
►Move the Master Control lever to position .
► Engage the chain brake.
► Start the engine without depressing the throttle
trigger.
The engine runs and the Master Control lever
remains in position .
► Run the engine for at least 30 seconds but no
more than 60 seconds (A) without depressing
the throttle trigger.
WARNING
■ If the chain brake is disengaged, the chain
may rotate This can result in serious injuries.
► Hold the chainsaw as described in this
instruction manual.
► Do not touch the rotating saw chain.
► Disengage the chain brake.
NOTICE
■ The calibration process is aborted if the throt‐
tle trigger is released before the saw is prop‐
erly calibrated. It is then necessary to restart
the calibration process.
►Keep the throttle trigger fully depressed.
NOTICE
■ The chainsaw can be incorrectly calibrated if
the throttle trigger is not kept fully depressed
during calibration. This can damage the saw.
►Keep the throttle trigger fully depressed.
► Depress the throttle trigger for at least 30
seconds (B) and hold it in that position.
The engine accelerates and the chain rotates.
Calibration of the saw takes place. Engine
speed varies noticeably during calibration.
► If the engine stalls: Make another attempt to
calibrate the saw.
► If the engine keeps stalling:
► Engage the chain brake.
► Do not use your chainsaw and contact your
STIHL servicing dealer for assistance.
Your saw has a malfunction.
► As soon as the engine speed drops noticeably
(C): Release the throttle trigger.
The engine runs at idling speed. Your saw is
calibrated and ready for operation.
11.4 Adjusting Oil Feed Rate
The chainsaw has an adjustable oil pump.
English 11 Operating the Saw
18 0458-788-0121-B

1
0000-GXX-7209-A0
The oil feed rate is suitable for most applications
when the oil pump adjusting screw (1) is in posi‐
tion E (Ematic).
The oil pump feed rate can be adjusted to suit
different bar lengths, wood species and working
techniques.
To increase oil feed rate
► Shut off the engine and engage the chain
brake.
► Turn the oil pump adjusting screw (1) clock‐
wise.
To reduce oil feed rate
► Shut off the engine and engage the chain
brake.
► Turn the oil pump adjusting screw (1) counter‐
clockwise.
11.5 Holding and Controlling the
Chainsaw
0000-GXX-2948-A1
► Hold and control your chainsaw with your left
hand on the handlebar and your right hand on
the control handle. Wrap thumb of left hand
around the handlebar and thumb of right hand
around the control handle.
11.6 Sawing
WARNING
■ If kickback occurs, the chainsaw can be
thrown up in the direction of the operator. This
may result in serious or fatal injury to the user.
►Always cut with the chain running at full
speed.
► Do not cut with the upper quadrant of the
guide bar nose.
► Begin the cut with the chain running at full
speed and keep the guide bar vertical.
0000-GXX-2949-A1
► Engage the spiked bumper and use it as a ful‐
crum.
► Guide the full width of the guide bar into the
wood and reposition the spiked bumper as
required.
► Take the weight of the chainsaw at the end of
the cut.
11.7 Limbing
0000-GXX-2950-A1
► Support the chainsaw on the log.
► With the chain running a full speed, pivot the
guide bar downward against the limb.
► Cut through the limb with the top of the guide
bar.
11 Operating the Saw English
0458-788-0121-B 19

0000-GXX-1245-A0
1
21
2
► If the limb is under tension: Make the relieving
cut (1) at the compression side and then per‐
form the bucking cut (2) from the tension side.
11.8 Felling
11.8.1 Determining direction of fall and
escape path
► Determine direction of fall so that the area in
which the tree falls is clear.
B
B
0000-GXX-1246-A0
► Observe the following points when planning
escape path (B):
–Escape path (B) at an angle of 45° to direc‐
tion of fall (A).
–No obstacles on the escape path (B).
–The top of the tree can be observed.
–If the escape path (B) is on a slope, it must
be parallel to the slope.
11.8.2 Preparing work area at base of tree
► Remove obstacles from work area at tree
base.
► Remove growth from tree base.
0000-GXX-1247-A0
► If the tree has large, healthy buttress roots:
Make vertical cut first and then a horizontal
cut, and remove the resulting piece.
11.8.3 Basic information on felling cut
Ø
1/10
0000-GXX-1251-A1
C
CE
G
C Felling notch
The felling notch determines the direction of
fall.
D Hinge
The hinge helps control the falling tree. The
width of the hinge is 1/10 of the trunk diame‐
ter.
E Felling cut
The tree is felled with the felling cut. The fell‐
ing cut is 1/10 of the trunk diameter (at least 3
cm) above the bottom of the felling notch.
F Stabilizing strap
The stabilizing strap supports the tree and
helps prevent it from falling prematurely. The
width of the stabilizing strap is 1/10 to 1/5 of
the trunk diameter.
G Holding strap
The holding strap supports the tree and helps
prevent it from falling prematurely. The width
of the holding strap is 1/10 to 1/5 of the trunk
diameter.
11.8.4 Cutting the felling notch
The felling notch determines the direction in
which the tree falls. Country-specific standards
for making the felling notch must be observed.
0000-GXX-1249-A0
► Position the saw so that the felling notch is an
right angles to the direction of fall and the saw
is close to the ground.
► Make the horizontal cut.
► Make the angle cut at 45° to the horizontal cut.
English 11 Operating the Saw
20 0458-788-0121-B