Stihl MS 391 User guide

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Chain Saw Safety Manual

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2009 0457-184-0121. M4.L09.FST. 0000000553_001_GB
Chain Saw Safety Manual
English
1
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Contents
This manual contains the safety
precautions and recommended cutting
techniques outlined in the instruction
manuals for STIHL chain saws.
The chapter on "Main Parts of the Saw"
shows the MS 211 as an example. Other
chain saw models may have different
parts and controls.
This manual contains references to
various chapters in the model-specific
instruction manuals.
You should therefore always refer to the
instruction manual of your particular saw
model.
Please contact your STIHL dealer if you
any questions after reading this manual.
Safety Precautions and Working
Techniques 2
Maintenance and Care 14
Main Parts 16

Chain Saw Safety Manual
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Observe the national safety regulations
issued, for example, by the employers'
liability insurance association, social
security institutions, occupational safety
and health authorities or other
organizations.
If you have never used a power tool
before: Ask the salesperson or another
expert to explain how to use it safely – or
attend a training course.
Minors should never be allowed to use a
chain saw – except for young trainees
over the age of 16 when working under
supervision.
Keep children, animals and bystanders
well away from the machine.
When not using the machine, it must be
laid down in such a way that it does not
endanger anyone. Ensure that the
machine cannot be used without
authorization.
The user is responsible for accidents or
risks involving third parties or their
property.
The machine should only be provided or
loaned to people familiar with this model
and its operation – and the Instruction
Manual should always be handed over
with the machine.
The machine may only be operated by
people who are fit, in good physical
health and in good mental condition. If
you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.
If you have a pacemaker: The ignition
system of your machine produces an
electromagnetic field of very low
intensity. An effect on individual
pacemaker types cannot be excluded
entirely. STIHL recommends that you
consult your doctor and the
manufacturer of your pacemaker in
order to avoid all health hazards.
Anyone who has consumed alcohol,
medicines affecting their ability to react
or drugs must not operate a power tool.
Postpone the work if the weather is bad
(rain, snow, ice, wind) - higher risk of
accidents!
Do not cut any material other than wood
or wooden objects.
Other uses are not permitted and may
lead to accidents or damage to the
machine. The machine must not be
modified in any way - this may also lead
to accidents or damage to the machine.
Only use tools, guide bars, chains, chain
sprockets or accessories that have been
approved by STIHL for this machine or
which are technically equivalent.
Contact a dealer if in doubt. Only use
high-quality tools or accessories.
Otherwise there may be a risk of
accidents or damage to the machine.
STIHL recommends the use of genuine
STIHL tools, guide bars, chains, chain
sprockets and accessories. These have
been optimized for the product and the
user's requirements.
Clothing and equipment
Wear proper protective clothing and
equipment.
Clothing which could become trapped in
wood, brush or moving parts of the
machine should not be worn. Do not
wear a scarf, tie or jewelry when
operating the machine. Long hair must
be tied up and covered (headscarf, cap,
helmet, etc.).
Safety Precautions and
Working Techniques
Special safety precau-
tions must be observed
when using a chain saw
because the work goes
faster than with an axe
and a hand saw, because
the chain runs at very
high speeds, and
because the cutters are
extremely sharp.
It is important that you
carefully read the entire
Instruction Manual before
using the machine for the
first time and keep it in a
safe place for future ref-
erence. Non-compliance
with the Instruction Man-
ual may cause serious or
even fatal injury.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Wear snug fit-
ting clothing with cut-
retardant pads – an
overall, not a loose-fitting
jacket.

Chain Saw Safety Manual
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STIHL can supply a comprehensive
range of protective clothing and
equipment.
Transporting the chain saw
Always engage the chain brake and
attach the chain scabbard – even before
transporting the saw for short distances.
When transporting the saw for longer
distances (more than approx. 50 m),
also stop the engine.
Always carry the saw by the handlebar –
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: When transporting in a
vehicle, properly secure your machine to
prevent turnover, damage and fuel
spillage.
Refueling
Switch off the engine before refueling.
Never refuel the machine while the
engine is still hot – the fuel may spill over
– risk of fire!
Open the filler cap carefully so that any
excess pressure is relieved gradually
and fuel does not splash out.
The machine may only be refueled in a
well ventilated place. Clean the machine
immediately if fuel is spilled. Change
your clothes immediately if they are
contaminated with fuel.
A number of different filler caps are
installed as standard at the factory.
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
Check that saw is properly assembled
and in good condition - refer to
appropriate chapters in the Instruction
Manual:
–functional chain brake, front hand
guard
–Correctly mounted guide bar
–Correctly tensioned chain
–The throttle trigger and throttle
trigger interlock must move easily –
throttle trigger must return
automatically to the idle position
when released.
–Master control/stop switch must
move easily to STOP or 0
–Check that the spark plug boot is
secure. A loose boot can lead to
flying sparks which may ignite the
escaping fuel/air mixture – risk of
fire!
–Never attempt to modify the controls
or safety devices
–Keep the handles dry and clean –
free from oil and pitch – for safe
control of the chain saw.
The chain saw should only be used if it
is in full working order – risk of
accident!
Starting the engine
Move at least 3 meters away from the
place at which the machine was refueled
and never in enclosed spaces.
Wear safety boots –
with cut-retardant mate-
rial, non-slip soles and
steel toe caps
Wear a hard hat – if
objects could fall on you.
Wear safety glasses or
a face shield and "per-
sonal" hearing
protection – e.g., ear
defenders.
Wear heavy-duty, non-
slip gloves – preferably
made of leather.
Gasoline is an
extremely flammable
fuel – keep clear of
naked flames and fire –
do not spill any fuel – no
smoking.
Close the filler cap as
tightly as possible after
refueling.
Place the cliplock filler
cap (bayonet-type) in
position, turn it until it will
go no further and fold the
cliplock down.

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The machine is operated by only one
person – there should not be any other
person within the working area – not
even when starting the machine.
Lock the chain with the chain brake
before starting – risk of personal injury
due to rotating chain!
Do not drop-start the engine – start as
described in the Instruction Manual.
Do not start the chain saw if the chain is
in a cut.
During work
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the Master
Control/stop switch to STOP or 0.
Never let the machine run unattended.
When the engine is running: Note that
the chain continues to rotate for a short
period after your let go of the throttle
trigger – coasting effect.
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!
Ensure you always have a firm and safe
footing.
Do not work alone – keep within calling
distance of others in case help is
needed.
More care and attention than usual are
required when wearing ear protection,
since warning sounds (shouts, alarms,
etc.) cannot be heard properly.
Take breaks in due time in order to
prevent tiredness and exhaustion – risk
of accidents!
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.
Ensure proper ventilation when working
in trenches, hollows or other confined
areas. Toxic fumes can kill!
If you feel sick, if you 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!
Dust (e.g., sawdust), fumes and smoke
produced while using the machine may
be hazardous to health. Wear a dust
mask if dust is generated.
No smoking when working with or near
the machine - risk of fire! Combustible
fuel vapor may escape from the fuel
system.
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 - refer also to the
section "Before starting". Check the fuel
system for leaks and make sure the
safety devices are working properly.
Never continue using a power tool that is
not in perfect working order. Consult a
STIHL dealer if in doubt.
Make certain that the saw chain does
not continue rotating when the engine is
idling – if necessary, correct the low
speed setting – if the chain continues to
keep rotating in idle, have it checked by
a servicing dealer.
Reactive forces
The most common reactive forces are:
kickback, pushback and pull-in.
Dangers of kickback
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These gases
may be colorless and
odourless and may con-
tain unburnt
hydrocarbons and ben-
zene. Never run the
engine indoors or in
poorly ventilated areas,
even if your model is
equipped with a catalytic
converter.
Kickback can result in
fatal cuts.

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5
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 pinched in the cut
Quickstop chain brake:
This device reduces the risk of injury in
certain situations - it cannot prevent
kickback. When activated, the chain
brake stops the saw chain within a
fraction of a second –
for a description of this device refer to
the section "Chain Brake" in this
Instruction Manual
Reduce the risk of kickback
–Work cautiously and methodically
–Hold the chainsaw firmly with both
hands and maintain a secure grip.
–Always cut at full throttle
–Be aware of the location 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
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:
001BA036 KN
001BA093 LÄ
001BA037 KN
A
001BA038 KN
B

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–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 unfavorably
–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.
Deadwood (brittle, rotten or dead wood)
poses a substantial, highly
unpredictable hazard. It is extremely
difficult or even practically impossible to
recognize the danger. Use aids such as
winches or draglines.
Always be especially careful
whenfelling timber near roads,
railway lines, power lines etc. If
necessary, notify police, power
companies or railway authorities.
Holding and guiding the machine
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.
Sawing
Do not use the starting throttle position
for cutting. Engine speed cannot be
controlled with the throttle trigger in this
position.
Work calmly and methodically – only
with good lighting and visibility. Do not
endanger others – stay alert at all times.
Use the shortest possible guide bar: The
chain, guide bar and chain sprocket
must match each other and your saw.
Make certain that all parts of your body
are well clear of the extended range of
travel of the saw chain.
Always pull the saw out of the cut with
the saw chain running.
Use the chain saw only for sawing – not
for prying or shoveling away limbs or
roots.
Do not underbuck freely hanging limbs.
Be careful when cutting shattered wood
– 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.
001BA087 LÄ
001BA082 KN

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On slopes, always stand above or to the
side of the trunk or felled tree. Watch out
for rolling trunks.
When working above ground level:
–always use a lift bucket
–never work on a ladder
–not in a tree
–not in unsteady locations
–not above shoulder height
–not with one hand
Begin cutting with the saw at full throttle
and engage the bumper spike – then
saw.
Never use the chain saw without the
bumper spike, the saw may pull you
forward suddenly. Always engage the
bumper spike securely.
At the end of the cut, the chain saw is no
longer supported by the cutting
attachment in the cut. The machine's
weight must be borne by the user – risk
of loss of control!
Felling
Felling may only be carried by persons
who have had special training. Persons
who are not experienced chain saw
users should carry out neither felling nor
limbing – increased risk of accidents!
Comply with national regulations
regarding felling technique.
Only persons who are engaged in felling
may be present in the felling area.
Make certain that no one is endangered
by the falling tree – engine noise can
drown out shouting.
The distance to the next worksite must
be at least 2 1/2 tree lengths
Determine direction of fall and
escape paths
Select a gap in the timber stand into
which the tree can be felled.
Pay special attention to the following
points:
–the natural inclination of the tree
–unusually heavy limb structure,
asymmetrical growth, damage to
tree
–wind direction and speed – do not
fell trees in high winds
–direction of slope
–neighboring trees
–snow load
–Take the general condition of the
tree into account – be especially
careful with trunk damage or
deadwood (brittle, rotten or dead
wood)
Adirection of fall
Bescape paths
001BA033 KN
001BA088 LÄ
2
/
12
1
1
/
12
B
001BA040 KN
A45°
45°
B

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–Establish escape paths for each
worker – approx. 45° diagonally
backwards
–Clear escape paths, eliminate
obstacles
–Put down tools and equipment at a
safe distance – but not on the
escape paths
–When felling, stand only to the side
of the falling trunk and only move
back laterally onto the escape route
–Plan escape routes on slopes
parallel to the slope
–When getting out of the way, watch
out for falling branches and the
crown area
Preparing the work area at the trunk
–Clear the work area at the trunk of
branches, brush and other
obstacles – secure footing for all
workers
–Carefully clear the base of the trunk
(e.g., with an axe) – sand, stones
and other foreign objects will dull the
saw chain
–Remove large buttresses: remove
the largest buttress first – saw first
vertically, then horizontally – only if
the tree is in sound condition
Making a felling notch
With the help of the gunning sight on the
shroud and fan housing of the chain
saw, it is possible to check the direction
of fall when cutting the felling notch.
When making the felling notch, orient
the chain saw so that the gunning sight
points precisely in the direction in which
you want the tree to fall.
Several possibilities are permissible
when it comes to the sequence of
horizontal and diagonal cuts – observe
national regulations with regard to felling
technique.
The felling notch (C) determines the
direction of fall.
STIHL recommends the following
procedure:
NMake a horizontal cut – in doing so,
check the direction of fall with the
gunning sight
NStart a diagonal cut at an
approx. 45° angle
NCheck the felling notch – then
correct the felling notch, if
necessary
Important:
–Felling notch at right angle to
direction of fall
–As close to the ground as possible
–cut to a depth of approx. 1/5 to 1/3
of the diameter of the trunk
001BA146 KN
001BA153 KN
001BA143 KN
C
C

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Sapwood cuts
With long-fibered wood, sapwood cuts
prevent the sapwood from splintering
when felling the trunk – saw both sides
of the trunk at the level of the felling
notch base to approx. 1/10 of the
diameter of the trunk – with thicker
trunks, not more than the width of the
guide bar.
Do not use sapwood cuts on diseased
trees.
Felling cut
Give a warning cry of "timber!" before
making the felling cut.
NMake the felling cut (D) slightly
higher than the horizontal cut of the
felling notch
–Exactly horizontal
–approx. 1/10 of the diameter of the
trunk must remain standing
between the felling cut and the
notch = bridge
Insert wedges in the felling cut in time –
use only wedges made of wood, light
metal or plastic - no steel wedges. Steel
wedges damage the saw chain and can
cause kickback.
The bridge (E) functions as a hinge to
guide the tree to the ground.
–Never saw through the bridge while
felling – otherwise the tree with fall
in a direction other than the one
planned – risk of accident!
–With rotten trunks, leave a wider
bridge
Immediately before felling the tree, give
out a second warning cry of "timber!".
001BA150 KN 001BA144 KN
D
D
001BA145 KN
E
E

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Thin trunks: simple fan cut
NEngage the spiked bumper behind
the hinge. Pivot the chain saw
around this point – only as far as the
bridge – the spiked bumper rolls
against the trunk.
Large diameter trunks: sectioning
method
Use the sectioning method if the
diameter of the trunk exceeds the length
of the chain saw guide bar.
1. First cut
The nose of the guide bar should
enter the wood just behind the hinge
– hold the saw absolutely
horizontally and swing it as far as
possible – use the spiked bumper
as a pivot point – reposition the
chain saw as little as possible.
2. While repositioning for the next cut,
keep the guide bar fully engaged in
the cut in order to avoid an uneven
felling cut - apply the spiked bumper
again, etc..
3. Insert wedge (3)
4. Last cut: Position the chain saw as
for the simple fan cut – do not saw
through the hinge!
Special cutting techniques
Plunge-cutting and heartwood cutting
require training and experience.
Plunge-cutting
–for felling leaners
–for relieving cuts during bucking
–for DYI projects
001BA147 KN
001BA148 KN
1
4
2

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11
Nuse a low kickback chain and be
especially cautious
1. Begin the cut by applying the lower
portion of the guide bar nose – do
not use the upper portion – risk of
kickback! Cut until the depth of the
kerf is twice the width of the guide
bar
2. Swing the saw slowly into the
plunge-cutting position – risk of
kickback or pushback!
3. Make the plunge cut very carefully –
danger of pushback!
Heartwood cut
–if the diameter of the trunk exceeds
twice the length of the guide bar
–if a piece of heartwood remains
uncut on large diameter trunks
–with trees that are difficult to fell
(oak, beech), to make possible to
maintain the planned direction of fall
more precisely and prevent the
heartwood from splintering
–with soft deciduous trees to relieve
tension in horizontal trunks and
prevent slivers of wood from being
torn out of the trunk
NMake the plunge cut in the felling
notch very carefully – danger of
pushback! – then swing in the
direction of the arrow
Limbing
Limbing may only be carried by persons
who have had special training. Persons
who are not experienced chain saw
users should carry out neither felling nor
limbing – risk of accidents!
–use a low-kickback saw chain
–Support the chain saw as much as
possible
–Do not stand on the trunk when
limbing
–Do not cut with the guide bar nose
–Watch out for limbs that are under
tension
–Never cut several limbs at once
Sawing thin wood
–Use a sturdy, stable fixture –
sawhorse
–Do not hold the wood in place with
your foot
–Other persons must neither be
allowed to hold the wood nor help in
any other way
Lying or standing logs under tension
Always make the cuts in the correct
order (first compression side (1), then
tension side (2), otherwise the chain
saw may pinch or kick back – risk of
injury!
NMake relieving cut in the
compression side (1)
NMake bucking cut in the tension
side (2)
1
2
3
001BA179 KN
1
001BA151 KN
2
1
001BA152 KN
2

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12
If the bucking cut is made from the
bottom upwards (underbuck) – risk of
pushback!
Ripping
Sawing technique without use of the
spiked bumper – risk of pull-in – position
the guidebar at as shallow an angle as
possible – be especially careful –
increased risk of kickback!
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands ("white finger
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
sensation)
–Low outside temperatures
–Amount of gripping force (holding
the power tool tightly restricts
circulation)
Users who use the machine periodically
or for long periods or users who
repeatedly experience corresponding
symptoms (e.g., tingling sensation in
fingers), should undergo a medical
examination.
Maintenance and repairs
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
authorized STIHL dealers. STIHL
dealers receive regular training and are
supplied with technical information.
Use only high-quality replacement parts,
in order to avoid the risk of accidents or
damage to the machine. Contact a
dealer if in doubt.
STIHL recommends the use of genuine
STIHL spare parts. Such parts have
been optimized for the machine and the
user's requirements.
Before starting any maintenance or
repair work and before cleaning the
machine, always stop the engine and
disconnect the spark plug boot – risk
of injury if the engine starts up
inadvertently! – Exception: adjustment
of carburetor and idle speed.
To reduce the risk of fire due to ignition
outside the cylinder, move the slide
control / stop switch to STOP or 0before
turning the engine over on the starter
with the spark plug boot removed or the
spark plug unscrewed.
Do not service or store the machine near
a naked light - 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.
Inspect 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! –
Hearing damage!
Never touch a hot muffler – risk of
burns!
The condition of the antivibration
elements influences vibration behavior –
inspect antivibration elements
periodically.
Inspect chain catcher – replace if
damaged.
Lying logs must not touch the
ground at the point where the cut
is made – otherwise the chain will
be damaged.
001BA189 KN

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13
Switch off engine
–to check the chain tension
–to retension the chain
–to change chains
–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.
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 labeled.
Avoid direct skin contact with gasoline.
Do not inhale gasoline vapors – danger
to health!
In the event of a chain brake
malfunction, switch off the machine
immediately – risk of injury! Consult a
dealer – do not use the machine until the
malfunction has been remedied, see
"chain brake".

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14
Maintenance and Care
The following maintenance intervals apply for normal operating conditions only. If your daily working
time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical
wood, etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend
the intervals accordingly.
before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required
Complete machine
Visual inspection (condition, leaks) XX
Clean X
Throttle trigger, trigger interlock, choke lever, stop
switch, Master Control lever (depending on
version)
Check operation XX
Chain brake
Check operation XX
Have checked by dealer1) X
Pickup body/filter in fuel tank
Check X
Clean, replace filter element XX
Replace XXX
Fuel tank Clean X
Chain oil tank Clean X
Chain Lubrication Check X
Saw chain
Inspect, also check sharpness XX
Check chain tension XX
Sharpen X
Guide bar
Check (wear, damage) X
Clean and turn over X
Deburr X
Replace XX
Chain sprocket Check X
Air filter
Clean XX
Replace X
Anti-vibration elements
Check XX
Have replaced by dealer1) X

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Cooling inlets Clean X
Cylinder fins Clean XX
Carburetor
Check idle adjustment – chain must not rotate XX
Adjusting Idle Speed X
Spark plug
Readjust electrode gap X
Replace after 100 hours of operation
All accessible screws and nuts (not adjusting
screws) 2) Retighten X
Spark arresting screen in muffler (not all markets)
Check1) X
Clean, replace if necessary1) X
Chain catcher
Check X
Replace X
Safety labels Replace X
1) STIHL recommends a STIHL servicing dealer.
2) Firmly tighten down the cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation.
The following maintenance intervals apply for normal operating conditions only. If your daily working
time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical
wood, etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend
the intervals accordingly.
before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required

Chain Saw Safety Manual
English
16
1Shroud lock
2Carburetor adjusting screws
3Fuel pump (easy start1))
4Shutter (summer / winter operation,
MS 211 only)
5Chain brake
6Chain sprocket
7Chain sprocket cover
8Chain catcher
9Chain tensioner (side)
10 Bumper spike
11 Guide bar
12 Oilmatic saw chain
13 Adjusting wheel (quick chain
tensioner)
14 Handle of wingnut1) (quick chain
tensioner)
15 Oil filler cap
16 Muffler
17 Front hand guard
18 Front handle (handlebar)
19 Spark plug boot
20 Starter grip
21 Fuel filler cap
22 Master Control lever
23 Throttle trigger
24 Throttle trigger interlock
25 Rear handle
26 Rear hand guard
#Serial number
Main Parts
10
4
13
14
6
3
1
12
9
8
25
7
11
7
8
20
26
25
21
19
16
15
17 18
22
23
24
#
533BA015 KN
1) Depending on model

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0457-184-0121
0457-184-0121
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