Stihl MS 261 C-M, MS 261, MS 241 C-M, MS 362 C-M, MS 201 C-M Instruction Manual
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STIHL MS 261 C-M
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 52
F Notice d’emploi
53 - 109
Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2014
0458-153-8221-A. VA5.K14.
0000006429_004_GB
MS 261 C-M
English
1
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This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
Contents
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It has been built using modern
production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and troublefree use of
the product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
Guide to Using this Manual 2
Safety Precautions 3
Reactive Forces 8
Working Techniques 9
Cutting Attachment 18
Mounting the Bar and Chain 19
Tensioning the Chain 20
Checking Chain Tension 20
Fuel 20
Fueling 21
Chain Lubricant 23
Filling Chain Oil Tank 23
Checking Chain Lubrication 24
Chain Brake 24
Winter Operation 25
Electric Handle Heating 26
Starting / Stopping the Engine 27
Operating Instructions 30
Oil Quantity Control 31
Taking Care of the Guide Bar 31
Shroud 32
Cleaning the Air Filter 32
Engine Management 33
M-Tronic 33
Spark Arresting Screen in Muffler 34
Spark Plug 34
Rewind Starter 35
Storing the Machine 35
Checking and Replacing the Chain
Sprocket 36
Maintaining and Sharpening the
Saw Chain 37
Maintenance and Care 41
Main Parts 43
Specifications 45
Ordering Spare Parts 46
Maintenance and Repairs 46
Disposal 46
Important Safety Instructions 47
Key to Symbols 48
STIHL Limited Emission Control
Warranty Statement 49
CSA Standard 51
MS 261 C-M
English
2
This Instruction Manual refers to a
STIHL chain saw, also called a machine
in this Instruction Manual.
Pictograms
Pictograms that appear on the machine
are explained in this Instruction Manual.
Depending on the machine and
equipment version, the following
pictograms may appear on the machine.
Symbols in text
WARNING
Warning where there is a risk of an
accident or personal injury or serious
damage to property.
NOTICE
Caution where there is a risk of
damaging the machine or its individual
components.
Engineering improvements
STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.
Therefore, some changes, modifications
and improvements may not be covered
in this manual.
Guide to Using this Manual
Fuel tank; fuel mixture of
gasoline and engine oil
Tank for chain oil; chain
oil
Engage and release
chain brake
Coasting brake
Direction of chain travel
Ematic; chain oil flow
adjustment
Tension saw chain
Intake air baffle: winter
operation
Intake air baffle: summer
operation
Handle heating
Actuate decompression
valve
Actuate manual fuel
pump
MS 261 C-M
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3
General
Observe all applicable local safety
regulations, standards and ordinances.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
If you have not used this model before:
Have your dealer or other experienced
user show you how to operate your
machine or attend a special course in its
operation.
Minors should never be allowed to use a
chain saw.
Keep bystanders, especially children,
and animals away from the work area.
The user is responsible for avoiding
injury to third parties or damage to their
property.
Do not lend or rent your chain saw
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
To operate a chain saw you must be
rested, in good physical condition and
mental health. If you have any condition
that might be aggravated by strenuous
work, check with your doctor before
operating a chain saw.
Do not operate the chain saw if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
To reduce the risk of accidents or injury,
put off the work in poor weather
conditions (rain, snow, ice, wind).
Persons with pacemakers only: The
ignition system of your chainsaw
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce health risks, STIHL recommends
that persons with pacemakers consult
their physician and the pacemaker
manufacturer before operating this
power tool.
Intended use
The machine may only be used to saw
wood and wooden objects.
Do not the machine for any other
purpose – risk of accidents!
Do not modify the machine in any way –
this may increase the risk of personal
injury. STIHL excludes all liability for
personal injury and damage to property
caused while using unauthorised
attachments.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Avoid clothing that could get caught on
branches or brush or moving parts of the
saw. Do not wear a scarf, necktie or
jewelry. Tie up and confine long hair
(e.g. with a hair net, cap, hard hat, etc.).
WARNING
Wear a face shield and make sure it is a
good fit. A face shield alone does not
provide adequate eye protection.
Wear hearing protection, e.g. earplugs
or ear muffs.
Wear a safety hard hat where there is a
danger of head injuries from falling
objects.
Safety Precautions
Special safety precautions must be observed to
reduce the risk of personal injury when
working with a chain saw
because of the very high
chain speed and very
sharp cutters.
It is important that you
read the instruction manual before first use and
keep it in a safe place for
future reference. Nonobservance of the
instruction manual may
result in serious or even
fatal injury.
Clothing must be sturdy
but allow complete freedom of movement. Wear
snug-fitting clothing with
cut retardant inserts – do
not wear a work coat.
Wear steel-toed safety
boots with cut retardant
inserts and non-slip
soles.
To reduce the risk of eye
injuries, wear snug-fitting
safety glasses in accordance with European
Standard EN 166. Make
sure the safety glasses
are a good fit.
MS 261 C-M
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4
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
Transport
Before any transport – even over short
distances – switch off the machine,
engage the chain brake and attach the
chain scabbard. This avoids the risk of
the saw chain starting unintentionally.
Always carry the chain saw by the
handle – with the hot muffler away from
your body, the guide bar must point to
the rear. Avoid touching hot parts of the
machine, especially the surface of the
muffler – risk of burns!
In vehicles: Properly secure the machine
to prevent tipping, damage and chain oil
or fuel spillage.
Cleaning
Clean plastic parts with a cloth. Harsh
detergents can damage the plastic.
Clean the dust and dirt off the machine –
do not use any grease solvents for this
purpose.
Clean the ventilation slots if necessary.
Do not use a high-pressure cleaner to
clean the machine. The hard jet of water
can damage parts of the machine.
Accessories
Only use those tools, guide bars, chains,
chain sprockets, accessories or
technically equivalent components that
have been approved by STIHL for this
machine. If you have any questions in
this respect, consult a servicing dealer.
Use only high quality tools and
accessories. Otherwise, there may be a
risk of accidents and damage to the
machine.
STIHL recommends the use of genuine
STIHL tools, guide bars, chains, chain
sprockets and accessories. They are
specifically designed to match your
model and meet your performance
requirements.
Refuelling
Switch off the engine before refuelling.
Never refuel the machine while the
engine is still hot – the fuel may spill over
– risk of fire!
Open the fuel filler cap carefully so that
any excess pressure is relieved
gradually and fuel does not splash out.
The machine may only be refuelled in a
well ventilated place. Clean the machine
immediately if fuel is spilled. Do not spill
fuel over your clothing – contaminated
clothing must be changed immediately.
The machines can be equipped with the
following filler caps as standard:
Cliplock filler cap (bayonet-type)
This helps reduce the risk of unit
vibrations causing an incorrectly
tightened filler cap to loosen or come off
and spill quantities of fuel.
Before Starting Work
Check that your saw is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manual.
– Check the fuel system for leaks,
paying special attention to visible
parts such as the tank cap, hose
connections and the manual fuel
pump (on machines so equipped). If
Wear heavy-duty work
gloves made of durable
material (e.g. leather).
001BA115 KN
Petrol is an extremely
flammable fuel – keep
clear of naked flames and
fire – do not spill any fuel
– no smoking.
Place the cliplock filler
cap (bayonet-type) in
position, turn as far as
stop and fold the cliplock
down.
Look out for leaks! Never
start the engine if fuel has
been spilled or is leaking
– Fatal burns may result!
MS 261 C-M
English
5
there are any leaks or damage, do
not start the engine – risk of fire.
Have your saw repaired by a
servicing dealer before using it
again.
– Check operation of chain brake,
front hand guard
– Correctly mounted guide bar
– Correctly tensioned chain
– The trigger and trigger lockout must
move freely and spring back to the
idle position when they are
released.
– Master Control lever must move
easily to STOP, 0 or †
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Never attempt to modify the controls
or safety devices in any way.
– Keep the handles dry and clean –
free from oil and dirt – for safe
control of the saw.
– Make sure there is sufficient fuel
and chain oil in the tanks.
To reduce the risk of personal injury, do
not operate your saw if it is damaged or
not properly assembled.
Starting the chain saw
Always work on a level surface. Ensure
a firm and secure footing. Hold the
machine securely – the chain must not
touch any objects or the floor – danger of
injury due to the rotating saw chain.
Your chain saw is a one-person saw. Do
not allow other persons to be in the
working area – not even while starting.
Do not start the chain saw if the chain is
in a cut.
Move at least 3 meters away from the
place where the machine was refuelled
and never start the motor in enclosed
spaces.
Lock the chain with the chain brake
before starting – risk of injury due to
rotating chain!
Do not drop-start the engine – start as
described in the Instruction Manual.
During operation
Ensure you always have a firm and safe
footing. Take special care when the bark
is wet – danger of slipping!
Always hold the chain saw firmly with
both hands: Right hand on the rear
handle – even if you are left-handed. To
ensure reliable control, wrap your
thumbs tightly around the handlebar and
handle.
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the Master
Control lever / stop switch to STOP, 0 or
†.
Never let the machine run unattended.
Exercise caution with slippery surfaces,
water, snow, ice, steep slopes, uneven
ground or green wood that has just been
stripped of its bark – danger of slipping!
Use caution with tree stumps, roots,
ditches – danger of stumbling!
Do not work alone – keep within calling
distance of others who are trained in
emergency procedures and can provide
help in an emergency. Helpers at the
cutting site must also wear protective
clothing (helmet!) and stand well clear of
the branches being cut.
More care and attention than usual are
required when wearing ear protection,
as warning sounds (shouts, beeps, etc.)
cannot be heard properly.
Take a break in good time to avoid
tiredness or exhaustion – risk of
accidents!
Dust (e. g., sawdust), fumes and smoke
produced while using the machine may
be hazardous to health. If dust is
generated, wear a dust mask.
When the engine is running: Note that
the saw chain continues to rotate for a
short period after you let go of the
throttle trigger – coasting effect.
No smoking when working with or near
the chain saw - risk of fire! Combustible
fuel vapour may escape from the fuel
system.
001BA087 LÄ
MS 261 C-M
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6
Examine the saw chain periodically at
short intervals and as soon as you note
any tangible changes:
– Switch off the engine; wait until the
saw chain is stationary
– Check condition and secure fitting
– Check sharpness
Never touch the saw chain when the
engine is running. If the saw chain
becomes jammed by an object, switch
off the engine immediately before
attempting to remove the object – risk of
injury!
Always turn off the engine before leaving
the machine unattended.
To change the saw chain, switch off the
engine. Risk of injury from the motor
starting unintentionally!
Keep easily combustible materials
(e. g., wood chips, bark, dry grass, fuel)
away from hot exhaust gases and hot
mufflers – risk of fire! Mufflers with
catalytic converters can become
especially hot.
Never work without chain lubrication –
monitor the oil level in the oil tank. Stop
work immediately if the oil level in the oil
tank is too low and top up with chain oil
– see also "Topping up with chain oil"
and "Check chain lubrication".
If the machine is subjected to unusually
high loads for which it was not designed
(e. g., heavy impact or a fall), always
check that it is in good condition before
continuing work – see also "Before
starting work".
Check the fuel system for leaks and
make sure the safety devices are
working properly. Never continue using
a machine that is not in perfect working
order. In case of doubt, have the unit
checked by your servicing dealer.
Check for correct idling, so that the saw
chain stops moving when the throttle
trigger is released. Check the idle setting
regularly and correct when possible.
Have the machine repaired by a STIHL
servicing dealer if the saw chain still
continues to move during idling.
Ensure proper ventilation when working
in trenches, hollows or other confined
locations – risk of fatal injury from
breathing toxic fumes!
If you feel sick, have a headache, vision
problems (e. g., your field of vision gets
smaller), hearing problems, dizziness or
inability to concentrate, stop work
immediately. Such symptoms may be
caused by an excessively high
concentration of exhaust emissions –
risk of accident!
After finishing work
Switch off the motor, engage the chain
brake and attach the chain scabbard.
Storage
When the machine is not in use, it
should be stored in such a way that noone is endangered. Secure the machine
against unauthorised use.
Store the machine in a safe, dry room.
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands (whitefinger
disease).
No general recommendation can be
given for the length of usage because it
depends on several factors.
The period of usage is prolonged by:
– Hand protection (wearing warm
gloves)
– Work breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, tingling
sensations).
– Low outside temperatures.
– The force with which the handles
are held (a tight grip restricts
circulation).
Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.
The chain saw produces
poisonous exhaust gases
as soon as the engine
starts. These gases may
be colourless and odourless and may contain
unburnt hydrocarbons
and benzene. Never work
with the machine indoors
or in poorly ventilated
areas, even if your
machine is equipped with
a catalytic converter.
MS 261 C-M
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Maintenance and repairs
Always switch off the engine before any
repair, cleaning or maintenance work
and any work on the chain. Risk of injury
if the engine starts inadvertently!
The machine must be serviced regularly.
Do not attempt any maintenance or
repair work not described in the
Instruction Manual. All other work should
be carried out by a servicing dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorised STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
Use only high-quality spare parts.
Otherwise, there may be a risk of
accidents and damage to the machine. If
you have any questions in this respect,
consult a servicing dealer.
Do not modify the machine in any way –
this may increase the risk of personal
injury –risk of accidents!
To reduce the risk of fire due to ignition
outside the cylinder, move the master
control level to STOP, 0 or † before
turning the engine over on the starter
when the spark plug boot is removed or
the spark plug is unscrewed!
Do not service or store the machine near
a naked flame – risk of fire due to the
fuel!
Check fuel cap regularly for tightness.
Use only spark plugs that are in perfect
condition and have been approved by
STIHL – see "Specifications".
Check ignition lead (insulation in good
condition, secure connection).
Check that the muffler is in perfect
working condition.
Do not use the machine if the muffler is
damaged or missing – risk of fire,
damage to hearing!
Never touch a hot muffler – risk of burns!
The condition of the anti-vibration
elements influences vibration behaviour
– inspect anti-vibration elements
periodically.
Inspect chain catcher – replace if
damaged.
Switch off the engine
– To check the chain tension
– To retension the chain
– To replace the chain
– For remedying malfunctions
Observe sharpening instructions – for
safe and proper handling, always keep
the chain and guide bar in flawless
condition. Keep the chain properly
sharpened, tensioned and well
lubricated.
Change chain, guide bar and chain
sprocket in due time.
Regularly check that the clutch drum is
in perfect working condition.
Always store fuel and chain lubricant
only in the specified type of containers
and ensure they are correctly labelled.
Store in a dry, cool and secure place
protected against light and sunlight.
In the event of a chain brake
malfunction, switch off the machine
immediately – risk of injury! Consult a
servicing dealer – do not use the
machine until the malfunction has been
remedied, see "Chain brake".
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
MS 261 C-M
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The most common reactive forces are:
kickback, pushback and pull-in.
Dangers of kickback
Kickback occurs when the saw is
suddenly thrown up and back in an
uncontrolled arc towards the operator.
Kickback occurs if, for example,
– The saw chain in the area of the
upper quarter of the guide bar nose
unintentionally comes into contact
with wood or a solid object – e. g.,
unintentionally touches another limb
during limbing
– The saw chain at the nose of the
guide bar is briefly pinched in the cut
QuickStop chain brake:
This device reduces the risk of injury in
certain situations – it cannot prevent
kickback. If activated, the brake stops
the saw chain within a fraction of a
second –
refer to chapter "Chain brake" in this
Instruction Manual.
Reducing the risk of kickback
– Work cautiously and methodically
– Hold the chain saw firmly with both
hands and maintain a secure grip
– Always cut at full throttle
– Be aware of th e loc ation of the guide
bar nose
– Do not cut with the guide bar nose
– Be especially careful with small,
tough limbs, undergrowth and
offshoots – the saw chain may
become caught in them
– Never cut several limbs at once
– Do not lean too far forward
– Do not cut above shoulder height
– Use extreme caution when re-
entering a previous cut
– Do not attempt plunge cuts if you
are not experienced in this cutting
technique
– Be alert for shifting of the log or
other forces that may cause the cut
to close and pinch the chain
– Always cut with a correctly
sharpened, properly tensioned saw
chain – the depth gauge setting
must not be too large
– Use low-kickback saw chains as
well as narrow-radius guide bars
Pull-in (A)
When the chain on the bottom of the bar
– overbucking – is suddenly pinched,
caught or encounters a foreign object in
the wood, the chain saw may suddenly
Reactive Forces
Kickback can result in
fatal cuts.
001BA036 KN
001BA257 KN
001BA037 KN
A
MS 261 C-M
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9
be drawn forward toward the log – to
avoid this, engage the bumper spike
firmly in the wood.
Pushback (B)
When the chain on the top of the bar –
underbucking – is suddenly pinched,
caught or encounters a foreign object in
the wood, the chain saw may suddenly
be driven straight back toward the
operator – to avoid this:
– Do not allow the top of the guide bar
to become jammed
– Do not twist the guide bar in the cut
Be very careful
– With freely hanging limbs
– With trunks that are under tension
between other trees because they
fell unfavourably
– When working in windbreaks
In these cases, do not use a chain saw –
use a hoist, winch or dragline instead.
Pull out trunks that are lying about and
have been cut free. Whenever possible,
deal with them in open areas.
Dead wood (brittle, rotten or dead wood)
poses a significant, highly unpredictable
hazard. It is extremely difficult or even
practically impossible to recognise the
danger. Use aids such as winches or
draglines.
When felling close to roads, rail lines,
power lines, etc., work with particular
care. If necessary, notify police, power
companies or railway authorities.
Sawing and felling work, including all
related work (plunge cutting, limbing,
etc.) may only be carried out by persons
who have been specially trained and
instructed. Persons who are not
experienced chain saw users should not
carry out any such work – increased risk
of accidents!
Country-specific legislation on felling
technique must be complied with during
felling work.
Cutting
Do not operate your saw with the
starting throttle lock engaged. Engine
speed cannot be controlled with the
throttle trigger in this position.
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Ensure you do not endanger
others – stay alert at all times.
First-time users are advised to practice
cutting logs on a sawhorse – see "When
cutting small logs".
Use the shortest possible guide bar: The
chain, guide bar and chain sprocket
must match each other and your saw.
001BA038 KN
B
Working Techniques
MS 261 C-M
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10
Position the saw so that your body is
clear of the cutting attachment.
Always pull the saw out of the cut with
the chain running.
Use your chain saw for cutting only. It is
not designed for prying or shoveling
away limbs, roots or other objects.
Do not underbuck freely hanging limbs.
Take care when cutting scrub and young
trees. The saw chain may catch and
throw thin shoots in your direction.
To reduce the risk of injury, take special
care when cutting shattered wood
because of the risk of injury from slivers
being caught and thrown in your
direction.
Make sure your saw does not touch any
foreign materials: Stones, nails, etc. may
be flung off and damage the saw chain.
The saw may kick back unexpectedly –
risk of accidents.
If the rotating chain makes contact with
a rock or other solid object there is a risk
of sparking which may cause easily
combustible material to catch fire under
certain circumstances. Dry plants and
scrub are also easily combustible,
especially in hot and dry weather
conditions. If there is a risk of fire, do not
use your chainsaw near combustible
materials, dry plants or scrub. Always
contact your local forest authority for
information on a possible fire risk.
If on a slope, stand on the uphill side of
the log. Watch out for rolling logs.
When working at heights:
– Always use a lift bucket
– Never work on a ladder or in a tree
– Never work on an insecure support
– Do not work above shoulder height
– Never operate your power tool with
one hand
Begin cutting with the saw at full throttle
and engage the spiked bumper firmly in
the wood, and then continue cutting.
Never work without the spiked bumper
because the saw may pull you forwards
and off balance. Always engage the
spiked bumper securely in the tree or
limb.
Note when reaching the end of a cut that
the saw is no longer supported in the
kerf. You have to take the full weight of
the machine since it might otherwise go
out of control.
When cutting small logs:
– Use a sturdy and stable support –
sawhorse.
– Never hold the log with your leg or
foot.
– Never allow another person to hold
the log or help in any other way.
Limbing:
– Use a low kickback chain.
– Work with the saw supported
wherever possible.
– Do not stand on the log while
limbing it.
– Do not cut with the bar nose.
– Watch for limbs which are under
tension.
– Never cut several limbs at once.
Lying or standing logs under tension:
Always make cuts in the correct
sequence (first at the compression
side (1), then at the tension side (2), the
saw may otherwise pinch or kick back –
risk of injury.
001BA082 KN
001BA033 KN
MS 261 C-M
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11
N Make relieving cut at the
compression side (1)
N Make bucking cut at the tension
side (2)
Be wary of pushback when making
bucking cut from the bottom upwards
(underbuck).
NOTICE
Do not cut a lying log at a point where it
is touching the ground because the saw
chain will otherwise be damaged.
Ripping cut:
Cutting technique in which the spiked
bumper is not used – risk of pull-in – start
the cut with the guide bar at the
shallowest possible angle – take extra
care since there is an increased danger
of kickback.
Preparations for Felling
Check that there are no other persons in
the felling area – other than helpers.
Make sure no-one is endangered by the
falling tree – the noise of your engine
may drown any warning calls.
Maintain a distance of at least 2 1/2 tree
lengths from the next felling site.
Determine direction of fall and escape
path.
Select gap in stand into which you want
the tree to fall.
Pay special attention to the following
points:
– The natural lean of the tree
– Any unusually heavy limb structure,
damage
– The wind direction and speed – do
not fell in high winds
– Sloping ground
– Neighboring trees
– Snow load
– Soundness of tree – take special
care if trunk is damaged or in case
of deadwood (dry, decayed or rotted
wood)
1
001BA151 KN
2
1
001BA152 KN
2
001BA189 KN
001BA088 LÄ
2
/
1
2
1 1
/
1
2
MS 261 C-M
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12
A Direction of fall
B Escape path (or retreat path)
– Establish paths of escape for
everyone concerned – opposite to
direction of fall at about 45°.
– Remove all obstacles from escape
paths.
– Place all tools and equipment a safe
distance away from the tree, but not
on the escape paths.
– Always keep to the side of the falling
tree and only walk away along the
preplanned escape path.
– On steep slopes, plan escape
routes parallel to the slope.
– When walking away along the
escape path, watch out for falling
limbs and watch the top of the tree.
Preparing work area at base of tree
– First clear the tree base and work
area from interfering limbs and
brush to provide a secure footing.
– Clean lower portion of tree base
(e.g. with an axe) – sand, stones
and other foreign objects will dull the
saw chain.
– Make the vertical cut first, then the
horizontal – but only if the wood is
sound
Felling Notch
Preparing felling notch
The felling notch (C) determines the
direction of fall.
Important:
– Make felling notch at a right angle to
the planned direction of fall.
– Cut close to the ground.
– Cut to a depth of about 1/5 to 1/3 of
the trunk diameter.
B
001BA040 KN
A
45°
45°
B
001BA146 KN
001BA271 KN
C
C
MS 261 C-M
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13
Determine direction of fall with gunning
sight on shroud and fan housing
Your chainsaw has a gunning sight on
the shroud and fan housing. Use this
gunning sight.
Making Felling Notch
Position the saw so that the felling notch
is at a right angle to the direction you
want the tree to fall.
The sequence in which the felling notch
is made with a horizontal cut (bottom)
and angled cut (top) is defined in
country-specific regulations.
N Make horizontal cut (bottom)
N Make the angled cut (top) at about
45°- 60° to the horizontal cut.
Check direction of fall
N Position the saw in the horizontal
cut. The gunning sight must point in
the planned direction of fall – if
necessary, correct direction of fall
by re-cutting the felling notch.
Sapwood cuts
Sapwood cuts in long-fibered softwood
help prevent sapwood splintering when
the tree falls. Make cuts at both sides of
the trunk at same height as bottom of
felling notch to a depth of about 1/10 of
trunk diameter. On large diameter trees,
cut to no more than width of guide bar.
Do not make sapwood cuts if wood is
diseased.
Basic Information on Felling Cut
Stump dimensions
The felling notch (C) determines the
direction of fall.
The hinge (D) helps control the falling
tree.
– Width of hinge: about 1/10 of tree
diameter.
– To reduce the risk of accidents, do
not cut through the hinge – you
could lose control of the direction of
fall.
– Leave a broader hinge on rotten
trees.
001BA153 KN
001BA153 KN
001BA150 KN
G
001BA259 KN
C
E
D
1/10
C
MS 261 C-M
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14
The tree is felled with the felling cut (E).
– Cut horizontally.
– 1/10 (at least 3 cm) of width of
hinge (D) higher than bottom of
felling notch (C).
The holding strap (F) or stabilizing
strap (G) supports the tree and helps
prevent it from falling prematurely.
– Width of strap: about 1/10 to 1/5 of
tree diameter.
– Do not cut into the strap while
making the felling cut.
– Leave a broader strap on rotten
trees.
Plunge cutting
– For relieving cuts during bucking
– For wood carving
N Use a low kickback chain and
exercise particular caution
1. Begin cut by applying the lower
portion of the guide bar nose – do
not use upper portion because of –
risk of kickback. Start cutting at full
throttle until depth of kerf is twice the
width of the guide bar.
2. Swing saw slowly into plungecutting position – take care because
of the risk of kickback or pushback.
3. Make the plunge cut very carefully.
Danger of pushback.
Use the plunge-cutting sight if possible.
The plunge-cutting sight and the top and
bottom of the guide bar are parallel.
When making the plunge cut, the sight
helps keep the hinge horizontal, i.e. the
same thickness all round. To do this,
hold the plunge-cutting sight parallel to
the chord of the felling notch.
Felling wedges
Make use of wedges as soon as
possible, i.e. providing they do not
interfere with cutting. Drive wedge into
felling cut with a suitable tool.
Use only aluminum or plastic wedges –
never steel. Steel wedges can seriously
damage the saw chain and cause
dangerous kickback.
Select felling wedges that suit the
diameter of the tree and width of the kerf
(felling cut (E)).
Contact your STIHL dealer for advice on
selecting the right felling wedge (length,
width and height).
Choosing Right Felling Cut
The criteria for choosing the right felling
cut are the same as those for
determining the direction of fall and the
escape path.
There are many different variations of
these characteristics. Only the two most
common characteristics are described in
this manual:
Felling Cut with Stabilizing Strap
(Normal Tree)
A) Small diameter trees
Perform this felling cut when the tree
diameter is smaller than the length of the
guide bar.
3.
001BA269 KN
1.
2.
001BA270 KN
Left: Normal tree – vertical trunk
with uniform tree crown.
Right: Leaner – tree crown leans in
direction of fall.
001BA260 KN
MS 261 C-M
English
15
Shout a warning before starting the
felling cut.
N Start felling cut (E) using plunge-cut
method – insert full length of guide
bar in the trunk.
N Engage the spiked bumper behind
the hinge and use it as a pivot –
avoid repositioning the saw more
than necessary.
N Enlarge felling cut as far as
hinge (1).
– Do not cut into the hinge.
N Enlarge felling cut as far as
stabilizing strap (2).
– Do not cut into the stabilizing strap.
N Insert a felling wedge (3).
Shout a second warning immediately
before the tree falls.
N Holding the saw with outstretched
arms, cut through the stabilizing
strap horizontally at the same level
as the felling cut.
B) Large diameter trees
Perform this felling cut when the tree
diameter is greater than the length of the
guide bar.
Shout a warning before starting the
felling cut.
N Engage the spiked bumper at the
required height of the felling cut and
use it as a pivot – avoid
repositioning the saw more than
necessary.
N The guide bar nose enters the
wood (1) before it reaches the hinge
– hold the saw horizontally and
swing it as far as possible.
N Enlarge felling cut as far as
hinge (2).
– Do not cut into the hinge.
N Enlarge felling cut as far as
stabilizing strap (3).
– Do not cut into the stabilizing strap.
Continue the felling cut on the other side
of the trunk.
Make sure the second cut is at the same
height as the first cut.
001BA261 KN
1.
2.
3.
001BA273 KN
4.
001BA263 KN
1.
2.
3.
5.
MS 261 C-M
English
16
N Start felling cut using plunge-cut
method.
N Enlarge felling cut as far as
hinge (4).
– Do not cut into the hinge.
N Enlarge felling cut as far as
stabilizing strap (5).
– Do not cut into the stabilizing strap.
N Insert a felling wedge (6).
Shout a second warning immediately
before the tree falls.
N Holding the saw with outstretched
arms, cut through the stabilizing
strap horizontally at the same level
as the felling cut.
Felling Cut with Holding Strap (Leaner)
A) Small diameter trees
Perform this felling cut when the tree
diameter is smaller than the length of the
guide bar.
N Plunge the guide bar into the trunk
until it emerges at the other side.
N Enlarge the felling cut (E) in
direction of hinge (1).
– Cut horizontally.
– Do not cut into the hinge.
N Enlarge the felling cut in direction of
holding strap (2).
– Cut horizontally.
– Do not cut into the holding strap.
Shout a second warning immediately
before the tree falls.
N Cut through the holding strap at a
downward angle from outside with
outstretched arms.
6.
001BA274 KN
1.
2.
001BA265 KN
001BA266 KN
MS 261 C-M
English
17
B) Large diameter trees
Perform this felling cut when the tree
diameter is greater than the length of the
guide bar.
N Engage the spiked bumper behind
the holding strap and use it as a
pivot – avoid repositioning the saw
more than necessary.
N The guide bar nose enters the
wood (1) before it reaches the hinge
– hold the saw horizontally and
swing it as far as possible.
– Do not cut into the holding strap or
hinge.
N Enlarge felling cut as far as
hinge (2).
– Do not cut into the hinge.
N Enlarge felling cut as far as holding
strap (3).
– Do not cut into the holding strap.
Continue the felling cut on the other side
of the trunk.
Make sure the second cut is at the same
height as the first cut.
N Engage the spiked bumper behind
the hinge and use it as a pivot –
avoid repositioning the saw more
than necessary.
N The guide bar nose enters the
wood (4) before it reaches the
holding strap – hold the saw
horizontally and swing it as far as
possible.
N Enlarge felling cut as far as
hinge (5).
– Do not cut into the hinge.
N Enlarge felling cut as far as holding
strap (6).
– Do not cut into the holding strap.
Shout a second warning immediately
before the tree falls.
N Cut through the holding strap at a
downward angle from outside with
outstretched arms.
001BA267 KN
1.
2.
3.
4.
5.
6.
001BA268 KN
MS 261 C-M
English
18
A cutting attachment consists of the saw
chain, guide bar and chain sprocket.
The cutting attachment that comes
standard is designed to exactly match
the chain saw.
– The pitch (t) of the saw chain (1),
chain sprocket and the nose
sprocket of the Rollomatic guide bar
must match.
– The drive link gauge (2) of the saw
chain (1) must match the groove
width of the guide bar (3).
If non-matching components are used,
the cutting attachment may be damaged
beyond repair after a short period of
operation.
Chain Scabbard
Your saw comes standard with a chain
scabbard that matches the cutting
attachment.
If guide bars of different lengths are
mounted to the saw, always use a chain
scabbard of the correct length which
covers the complete guide bar.
The length of the matching guide bars is
marked on the side of the chain
scabbard.
Guide bars longer than 90 cm require
one scabbard extension. Guide bars
longer than 120 cm require two
scabbard extensions.
Depending on the model, the scabbard
extension either comes standard with
the saw or is available as a special
accessory.
Fitting Chain Scabbard Extension
N Push the scabbard extension and
chain scabbard together – the
lugs (1) must engage in the chain
scabbard.
Cutting Attachment
001BA248 KN
1
2
3
a
001BA244 KN
001BA245 KN
1
1
MS 261 C-M
English
19
Removing the chain sprocket cover
N Rotate the captive nuts
counterclockwise until they hang
loosely in the sprocket cover.
N Remove the sprocket cover with
captive nuts.
N Turn the screw (1)
counterclockwise until the tensioner
slide (2) butts against the left end of
the housing slot.
Disengaging the chain brake
N Pull the hand guard towards the
front handle until there is an audible
click – the chain brake is
disengaged.
Fitting the chain
WARNING
Wear work gloves to protect your hands
from the sharp cutters.
N Fit the chain – start at the bar nose.
N Fit the guide bar over the studs (1) –
the cutting edges on the top of the
bar must point to the right.
N Engage the peg of the tensioner
slide in the locating hole (2) –- place
the chain over the sprocket (3) at
the same time.
N Turn the tensioning
screw (4)clockwise until there is
very little chain sag on the
underside of the bar – and the drive
link tangs are engaged in the bar
groove.
N Refit the sprocket cover and tighten
the nuts only moderately by hand
(they are finally tightened after the
saw chain is tensioned).
N Go to chapter on "Tensioning the
Saw Chain"
Mounting the Bar and Chain
5902BA020 KN
1
2
001BA185 KN
001BA186 KN
143BA003 KN
3
1
1
2
4
001BA187 KN
MS 261 C-M
English
20
Retensioning during cutting work:
N Shut off the engine.
N Loosen the nuts.
N Hold the bar nose up.
N Use a screwdriver to turn the
tensioning screw (1) clockwise until
the chain fits snugly against the
underside of the bar.
N While still holding the bar nose up,
tighten down the nuts firmly.
N Go to "Checking Chain Tension".
A new chain has to be retensioned more
often than one that has been in use for
some time.
N Check chain tension frequently –
see chapter on "Operating
Instructions".
N Shut off the engine.
N Wear work gloves to protect your
hands.
N The chain must fit snugly against
the underside of the bar and it must
still be possible to pull the chain
along the bar by hand.
N If necessary, retension the chain.
A new chain has to be retensioned more
often than one that has been in use for
some time.
N Check chain tension frequently –
see chapter on "Operating
Instructions".
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 (R+M)/2.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
Tensioning the Chain
1
133BA024 KN
Checking Chain Tension
143BA007 KN
Fuel
MS 261 C-M
English
21
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke aircooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped with a catalytic converter.
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The fuel tank and the canister in which
fuel mix is stored should be cleaned
from time to time.
Fuel mix ratio
Only mix sufficient fuel for a few days
work, not to exceed 30 days of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Preparing the machine
N Before fueling, clean the cap and
the area around it to ensure that no
dirt falls into the fuel tank
N Always position the machine so that
the cap is facing upwards
Opening
N Raise the grip until it is upright.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
liters liters (ml)
10.02(20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Fueling
001BA229 KN
001BA236 KN
MS 261 C-M
English
22
N Turn the cap counterclockwise
(about a quarter turn).
Marks on tank cap and fuel tank must
line up.
N Remove the cap.
Filling up with fuel
Take care not to spill fuel while fueling
and do not overfill the tank.
STIHL recommends you use the STIHL
filler nozzle for fuel (special accessory).
N Fill up with fuel.
Closing
Grip must be vertical:
N Fit the cap – marks on tank cap and
fuel tank must line up.
N Press the cap down as far as stop.
N While holding the cap depressed,
turn it clockwise until it engages in
position.
The marks on the tank cap and fuel tank
are then in alignment.
N Fold the grip down so that it is flush
with the top of the cap.
Tank cap is locked.
If the tank cap cannot be locked in the
fuel tank opening
Bottom of cap is twisted in relation to
top.
N Remove the cap from the fuel tank
and check it from above.
001BA232 KN
001BA234 KN
001BA237 KN
001BA234 KN
001BA233 KN
001BA231 KN
001BA235 KN
001BA241 KN
MS 261 C-M
English
23
N Place the cap on the opening and
rotate it counterclockwise until it
engages the filler neck.
N Continue rotating the cap
counterclockwise (about a quarter
turn) – this causes the bottom of the
cap to be turned to the correct
position.
N Turn the cap clockwise and lock it in
position – see section on "Closing".
For automatic and reliable lubrication of
the chain and guide bar – use only an
environmentally compatible quality
chain and bar lubricant. Rapidly
biodegradable STIHL BioPlus is
recommended.
NOTICE
Biological chain oil must be resistant to
aging (e.g. STIHL BioPlus), since it will
otherwise quickly turn to resin. This
results in hard deposits that are difficult
to remove, especially in the area of the
chain drive and chain. It may even cause
the oil pump to seize.
The service life of the chain and guide
bar depends on the quality of the
lubricant. It is therefore essential to use
only a specially formulated chain
lubricant.
WARNING
Do not use waste oil. Renewed contact
with waste oil can cause skin cancer.
Moreover, waste oil is environmentally
harmful.
NOTICE
Waste oil does not have the necessary
lubricating properties and is unsuitable
for chain lubrication.
Preparations
N Thoroughly clean the oil filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
filler cap is facing up.
N Open the filler cap.
Fill up with chain oil.
N Refill the chain oil tank every time
you refuel.
Take care not to spill chain oil while
refilling and do not overfill the tank.
STIHL recommends you use the STIHL
filler nozzle for chain oil (special
accessory).
N Close the filler cap.
There must still be a small amount of oil
in the oil tank when the fuel tank is
empty.
Left: Bottom of cap is twisted –
inner mark (1) in line with
outer mark.
Right: Bottom of cap in correct posi-
tion – inner mark is under the
grip. It is not in line with the
outer mark.
1
001BA238 KN
001BA239 KN
Chain Lubricant Filling Chain Oil Tank
001BA158 KN
MS 261 C-M
English
24
If the oil level in the tank does not go
down, the reason may be a fault in the oil
supply system: Check chain lubrication,
clean the oilways, contact your dealer
for assistance if necessary STIHL
recommends that you have servicing
and repair work carried out exclusively
by an authorized STIHL servicing
dealer.
The saw chain must always throw off a
small amount of oil.
NOTICE
Never operate your saw without chain
lubrication. If the chain runs dry, the
whole cutting attachment will be
irretrievably damaged within a very short
time. Always check chain lubrication and
the oil level in the tank before starting
work.
Every new chain has to be broken in for
about 2 to 3 minutes.
After breaking in the chain, check chain
tension and adjust if necessary – see
"Checking Chain Tension".
Locking the chain
– in an emergency
– when starting
– at idling speed
The chain brake is activated by pushing
the hand guard toward the bar nose with
your left hand – or by inertia in certain
kickback situations: The chain is
stopped and locked.
Checking Chain Lubrication
143BA024 KN
Chain Brake
143BA011 KN
MS 261 C-M
English
25
Releasing the chain brake
N Pull the hand guard back toward the
front handle,
NOTICE
Always disengage chain brake before
accelerating the engine (except when
checking its operation) and before
starting cutting work.
High revs with the chain brake engaged
(chain locked) will quickly damage the
powerhead and chain drive (clutch,
chain brake).
The chain brake is also activated by the
inertia of the front hand guard if the
kickback force of the saw is high
enough: The hand guard is accelerated
toward the bar nose – even if your left
hand is not behind the hand guard, e.g.
during felling cut.
The chain brake will operate only if the
hand guard has not been modified in any
way.
Check operation of the chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose) and open
the throttle wide for no more than
3 seconds – the chain must not rotate.
The hand guard must be free from dirt
and move freely.
Chain brake maintenance
The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel. STIHL recommends that you
have servicing and repair work carried
out exclusively by an authorized STIHL
servicing dealer. Maintain the following
servicing intervals:
Preheating the carburetor
N Remove the shroud – see "Shroud".
At temperatures below +10°C
N Use the combination wrench or a
screwdriver to ease the shutter out
of the summer position s.
N Refit the shutter the other way round
in the winter position – the arrow
points to the symbol r – the shutter
must snap into position.
The arrowhead (1) is visible in the winter
position.
N Install the shroud – see "Shroud".
143BA012 KN
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
Winter Operation
5902BA002 KN
5902BA003 KN
1
MS 261 C-M
English
26
Heated air is now drawn in from around
the cylinder to warm the carburetor – this
helps prevent carburetor icing.
At temperatures above +20°C
N Return the shutter to the summer
position s .
NOTICE
This is important to reduce the risk of
engine running problems and
overheating.
At temperatures below -10°C
It is advisable to fit the "cover plate" kit
(special accessory) if you use your saw
in extremely cold conditions
(temperatures below -10°C, in powder
or drifting snow).
The cover plate (special accessory)
helps prevent snow being sucked into
the machine.
When the cover plate is fitted, the
shutter must be in the winter position.
In the event of engine running problems,
first check that conditions for use of the
cover plate still apply.
Fitting the cover plate
N Place the cover plate (1) in position,
engage the two tabs (arrows), and
secure it with the screws (2).
When the cover plate is fitted, the
shutter must be in the winter position.
If engine running problems occur, check
that conditions for use of the cover plate
still apply.
Switching on handle heating (depending
on model)
N Move the switch to F – move switch
back to 0 to switch off.
There is no risk of overheating during
long periods of operation. The heating
system is maintenance-free.
5902BA004 KN
Electric Handle Heating
5902BA041 KN
MS 261 C-M
English
27
Positions of Master Control Lever
STOP or † – Master Control lever must
be pushed in direction of STOP or † to
switch off ignition. The Master Control
lever springs back to the run position F
when it is released.
WARNING
The ignition is switched on again
automatically after the engine stops.
Engine can be started by operating the
rewind starter.
Normal run position (F) – engine runs or
can fire.
Start } – the engine is started in this
position.
Setting the Master Control Lever
To move the Master Control lever from
the run position F to start }, depress
the trigger lockout and the throttle trigger
and hold them in that position – set the
Master Control lever to start } and let
go of the throttle trigger and trigger
lockout.
The Master Control lever moves from
the start position (}) to the run
position (F) when you press down the
throttle trigger lockout and squeeze the
throttle trigger at the same time.
To switch off the engine, move the
Master Control lever in the direction of
STOP or † – when released, the Master
Control lever springs back to the run
position F.
Holding the Saw
There are two ways of holding the saw
when starting.
On the ground
N Place your saw on the ground.
Make sure you have a firm footing –
check that the chain is not touching
any object or the ground.
N Hold the saw firmly on the ground
with your left hand on the front
handle – your thumb should be
under the handle.
N Put your right foot into the rear
handle or your right heel on the rear
hand guard and press down.
Starting / Stopping the
Engine
5902BA042 KN
STOP
5902BA043 KN
MS 261 C-M
English
28
Between knees or thighs
N Hold the rear handle tightly between
your legs, just above the knees.
N Hold the front handle firmly with
your left hand – your thumb should
be under the handle.
Cranking
N Pull the starter grip slowly with your
right hand until you feel it engage –
and then give it a brisk strong pull
and push down the front handle at
the same time. Do not pull out the
starter rope to full length – it might
otherwise break. Do not let the
starter grip snap back. Guide it
slowly back into the housing so that
the starter rope can rewind properly.
Machines without additional manual fuel
pump: If the engine is new or after a long
out-of-service period or if the tank has
been run dry (engine stops), it may be
necessary to pull the starter rope several
times to prime the fuel system.
Starting the Saw
Decompression valve
N Press in the button to open the
decompression valve.
The decompression valve closes as
soon as the engine fires. For this reason
you must press in the button before each
starting attempt.
WARNING
Bystanders must be well clear of the
general work area of the saw.
5902BA044 KN
5902BA045 KN
5902BA006 KN
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