Stihl MS 170 User manual

STIHL MSE 170 C, 190 C,
210 C, 230 C
Instruction Manual
2 - 38

Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions......................................3
3 Reactive Forces.......................................... 7
4 Working Techniques................................... 8
5 Packing List...............................................15
6 Cutting Attachment................................... 15
7 Mounting the Bar and Chain (side chain ten‐
sioner)....................................................... 15
8 Mounting the Bar and Chain (quick chain
tensioner).................................................. 17
9 Tensioning the Saw Chain (side chain ten‐
sioner)....................................................... 19
10 Tensioning the Saw Chain (quick chain ten‐
sioner)....................................................... 19
11 Checking Chain Tension...........................19
12 Chain Lubricant.........................................19
13 Filling Chain Oil Tank................................20
14 Checking Chain Lubrication...................... 22
15 Coasting Brake......................................... 22
16 Chain Brake.............................................. 22
17 Connecting to Power Supply.....................23
18 Switching On.............................................23
19 Switching Off.............................................24
20 Overload Cutout........................................24
21 Operating Instructions...............................25
22 Taking Care of the Guide Bar................... 25
23 Motor Cooling............................................26
24 Storing the Machine.................................. 26
25 Checking and Replacing the Chain
Sprocket....................................................26
26 Maintaining and Sharpening the Saw Chain
.................................................................. 27
27 Maintenance and Care..............................30
28 Minimize Wear and Avoid Damage...........31
29 Main Parts.................................................32
30 Specifications............................................33
31 Ordering Spare Parts................................ 35
32 Maintenance and Repairs......................... 35
33 Disposal.................................................... 35
34 EC Declaration of Conformity................... 36
35 General Power Tool Safety Warnings.......36
Dear Customer,
Thank you for choosing a quality engineered
STIHL product.
It has been built using modern production techni‐
ques and comprehensive quality assurance.
Every effort has been made to ensure your satis‐
faction and trouble-free use of the product.
Please contact your dealer or our sales company
if you have any queries concerning this product.
Your
Dr. Nikolas Stihl
1 Guide to Using this Manual
This instruction manual covers a STIHL electric
chain saw which is also referred to as the saw,
power tool or machine in the descriptions.
1.1 Pictograms
The meanings of the pictograms attached to the
machine are explained in this manual.
Depending on the model concerned, the follow‐
ing pictograms may be attached to your
machine.
Chain oil tank; chain oil
Direction of chain rotation
Tension the chain
Thermal overload cutout
Unlock
Lock
1.2 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.
1.3 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.
English
2 0458-756-0121-B
© ANDREAS STIHL AG & Co. KG 2021
0458-756-0121-B. VA0.D21.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000006380_019_GB

Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual.
2 Safety Precautions
Special safety precautions must be
observed to reduce the risk of per‐
sonal 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. Non-observance of the
instruction manual may result in seri‐
ous or even fatal injury.
2.1 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 unit or attend a special
course in its operation.
Minors should never be allowed to use a chain
saw.
Keep bystanders, especially children, and ani‐
mals 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.
Persons who are not able to operate the power
tool safely due to limited physical, sensory or
mental ability may work with it only under super‐
vision or after instruction by a responsible per‐
son.
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).
2.2 Intended Use
The chainsaw may be used for cutting wood and
wooden objects only. It is particularly suitable for
cutting firewood and other woodworking projects
close to the house.
It must not be used for any other purpose
because of the increased risk of accidents.
Never attempt to modify your saw in any way
since this may increase the risk of personal
injury. STIHL excludes all liability for personal
injury and damage to property caused while
using unauthorized attachments.
2.3 Clothing and Equipment
Wear proper protective clothing and equipment.
Clothing must be sturdy but allow
complete freedom of movement.
Wear snug-fitting clothing with cut
retardant inserts – do not wear a work
coat.
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.).
Wear suitable footwear with cut
retardant inserts, non-slip soles and
steel toe.
WARNING
To reduce the risk of eye injuries,
wear close-fitting safety glasses in
accordance with European Standard
EN 166. Make sure the safety
glasses are a comfortable and snug
fit.
Wear a face shield and make sure it is a good fit.
Hearing protection is recommended if your daily
working time is more than 2.5 hours.
Wear a safety hard hat with chin strap where
there is a danger of head injuries from falling
objects.
Wear heavy-duty work gloves made
of durable material (e.g. leather).
STIHL offers a comprehensive range of personal
protective clothing and equipment.
2 Safety Precautions English
0458-756-0121-B 3

2.4 Transporting
Always switch off the chainsaw before carrying it
– even for short distances, disconnect the plug
from the wall outlet, move the hand guard to ƒ
and fit the chain scabbard. This avoids the risk of
the motor starting unintentionally.
Carry your chainsaw by the front handle only
with the guide bar behind you.
In vehicles: Properly secure your chainsaw to
prevent turnover, chain oil spillage and damage.
2.5 Cleaning
Clean plastic surfaces with a cloth. Do not use
aggressive detergents. They may damage the
plastic.
Always clean dust and dirt off the chainsaw – do
not use any grease solvents for this purpose.
Clean the cooling slots if necessary.
Do not use a pressure washer to clean the saw.
The solid jet of water may damage parts of the
saw.
Do not spray the chainsaw with water.
2.6 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.
2.7 Drive Gear
2.7.1 Electrical Connection.
The wall outlet must be equipped with a ground-
fault circuit breaker or such a device must be
installed between the wall outlet and the power
tool – see "Connecting Saw to Power Supply".
If the connecting cord is damaged,
immediately disconnect the plug from
the power supply to avoid the risk of
electric shock.
Reduce the risk of electric shock:
–Voltage and frequency of the machine (see
rating plate) and the voltage and frequency of
your power supply must be the same.
–Check the connecting cord, plug, extension
cord and safety devices for damage. Never
use damaged cords, couplings and plugs or
connecting cords that do not comply with regu‐
lations.
–Always connect the power tool to a properly
installed wall outlet.
–Check that the insulation of the power cord,
extension cord, plug and coupling is in good
condition.
–Never jerk the connecting cord to disconnect it
from the wall outlet. To unplug, grasp the plug,
not the cord.
Position the connecting and extension cords cor‐
rectly:
–Check minimum cross section of wires (wire
gauge) – see "Connecting to Power Supply".
–To reduce the risk of stumbling, position and
mark the connecting cord so that it cannot be
damaged or endanger others.
–Using unsuitable extension cords can be dan‐
gerous. Make sure the extension cord used
complies with the regulations for the intended
application.
–The plug and coupling of the extension cord
must be water-proof and must never be
immersed in water.
–Do not chafe on edges, pointed or sharp
objects
–Do not squeeze through gaps in doors or win‐
dows
–If cords are twisted – unplug the power tool
and straighten them out
–Always unwind the extension cord completely
from the cable drum to reduce the risk of fire
from overheating.
–The extension cord must always be behind
you (i.e. the operator).
–Make sure that it cannot become entangled
with branches during cutting.
–Position the connecting cord so that it cannot
come into contact with the rotating chain.
Do not drive over, squash or jerk the connecting
cord. Protect it from heat, oil and sharp edges.
2.8 Before Starting Work
Disconnect the plug from the wall outlet:
–before carrying out tests and adjustments or
cleaning work
–when working on the cutting attachment
–before leaving your chainsaw unattended
English 2 Safety Precautions
4 0458-756-0121-B

–before transporting
–before storing
–before performing repairs and maintenance
work
–in the event of danger or in an emergency
Check that your saw is properly assembled and
in good condition – refer to appropriate chapters
in the instruction manual.
–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.
–Trigger is locked in position when trigger lock‐
out is not depressed.
–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 chain oil in the
tank.
To reduce the risk of personal injury, do not
operate your saw if it is damaged or not properly
assembled.
2.9 Switching On the Saw
Start the saw on level ground only. Make sure
you have a firm footing. Hold the saw firmly –
check that the cutting attachment is not touching
any object or the ground.
The chainsaw is a one-person saw. Do not allow
other persons in the work area – even when
starting.
Do not attempt to switch on the saw when the
saw chain is in a cut.
Switch on as described in the instruction manual.
2.10 During Operation
Make sure you always have good balance and
secure footing. To avoid slipping, take special
care when the bark is wet.
9931BA042 KN
Always hold your saw firmly with both hands:
Right hand on the rear handle, even if you are
left-handed. To ensure safe control, wrap your
fingers tightly around the front handle and control
handle.
In case of imminent danger or in an emergency,
switch off the chainsaw immediately, move hand
guard to ƒ and disconnect the plug from the
wall outlet.
The drive motor is not waterproof.
Never work with the power tool in the
rain or in wet or very damp locations.
Do not leave you power tool out in the rain and
do not operate it as long as it is damp.
Take special care in slippery conditions – damp,
snow, ice, on slopes, uneven ground and freshly
debarked logs.
Watch out for obstacles such as tree stumps,
roots and ditches which could cause you to trip
or stumble.
Do not work alone – keep within calling distance
of other persons trained in first aid who can pro‐
vide assistance in an emergency. Helpers at the
cutting site must also wear protective clothing
(hard hat) and stand well clear of the branches
being cut.
Be particularly alert and cautious when wearing
hearing protection because your ability to hear
warnings (shouts, alarms, etc.) is restricted.
To reduce the risk of accidents, take a break in
good time to avoid tiredness or exhaustion.
The dusts (e.g. sawdust), vapor and smoke pro‐
duced during operation may be dangerous to
health. If dust levels are very high, wear a suita‐
ble respirator.
Check the saw chain at regular short intervals
during operation or immediately if there is a
noticeable change in cutting behavior:
2 Safety Precautions English
0458-756-0121-B 5

–Switch off the motor, wait for the chain to
come to a standstill, disconnect the plug from
the wall outlet.
–Check condition and proper mounting.
–Check sharpness.
Do not touch the chain while the chainsaw is
switched on. If the chain becomes jammed by an
obstacle, switch off the motor immediately and
disconnect the plug from the power supply
before attempting to free the obstruction – risk of
injury.
Before leaving your saw, switch it off, move the
hand guard to ƒ and disconnect the plug from
the wall outlet to reduce the risk of the motor
starting unintentionally.
To replace the saw chain, switch off the chain‐
saw, move hand guard to ƒ and disconnect the
plug from the wall outlet. This avoids the risk of
injury from the motor starting unintentionally.
Your power tool is equipped with a system
designed to quickly stop the saw chain – it
comes to an immediate standstill as soon as you
release the trigger switch – see "Coasting
Brake".
Check this function at regular short intervals. Do
not operate your chainsaw if the chain continues
to run after you release the trigger switch – see
"Coasting Brake" – risk of injury. Contact your
servicing dealer.
Never operate your saw without proper chain
lubrication – check oil level regularly during oper‐
ation. Stop work immediately if the oil level is too
low and refill the oil tank – see also chapters on
"Filling Chain Oil Tank" and "Checking Chain
Lubrication".
If your saw 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 Start‐
ing Work". Make sure the safety devices are
working properly. Do not continue operating your
saw if it is damaged. In case of doubt, consult
your servicing dealer.
2.11 After Finishing Work
Switch off the saw, move the hand guard to ƒ,
disconnect the plug from the wall outlet and fit
the chain scabbard.
2.12 Storing
When the chainsaw is not in use, store it so that
it does not endanger others. Secure it against
unauthorized use.
Store your chainsaw in a dry location with the
hand guard on ƒ and the plug disconnected
from the wall outlet.
2.13 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 cir‐
culation (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.
2.14 Maintenance and Repairs
Before carrying out any repairs, cleaning or
maintenance work or work on the cutting attach‐
ment, always switch off the chainsaw, move the
hand guard to ƒ and disconnect the plug from
the wall outlet. This avoids the risk of injury from
the chain starting unintentionally.
Service the chainsaw regularly. Do not attempt
any maintenance or repair work not described in
the instruction manual. Have all other work per‐
formed by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
saw. If you have any questions in this respect,
consult a servicing dealer.
English 2 Safety Precautions
6 0458-756-0121-B

Never attempt to modify your saw in any way
since this may increase the risk of personal
injury.
Regularly check the electrical contacts and
ensure that the insulation of the connecting cord
and plug shows no sign of aging (brittleness).
Electrical components, e.g. power cord, may only
be repaired or replaced by a qualified electrician.
Check the chain catcher and replace it if dam‐
aged.
Observe sharpening instructions – keep the
chain and guide bar in good condition at all times
for safe and correct handling of the machine. The
chain must be properly sharpened, tensioned
and well lubricated.
Always change the chain, guide bar and sprocket
in good time.
Store chain lubricant in properly labeled, safety-
type canisters only. Store in a dry, cool and safe
location protected from light and the sun.
If there is a problem with the chain brake, switch
off the saw immediately, move the hand guard to
ƒ and disconnect the plug from the wall outlet –
risk of injury. Contact your servicing dealer – do
not use your saw until the problem has been rec‐
tified (see "Chain Brake").
3 Reactive Forces
The most common reactive forces that occur dur‐
ing cutting are: kickback, pushback and pull-in.
3.1 Dangers of kickback
Kickback can result in serious or fatal
injury.
001BA036 KN
(Kickback) occurs when the saw is suddenly
thrown up and back in an uncontrolled arc
towards the operator.
3.2 Kickback occurs if, e. g.,
001BA257 KN
–when the upper quadrant of the bar nose unin‐
tentionally contacts wood or another solid
object, e.g. when another limb is touched acci‐
dentally during limbing.
–when the chain at the nose of the guide bar is
pinched in the cut.
3.3 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 –
see the section "Saw chain" in this Instruction
Manual.
3.4 To reduce the risk of kickback
–Work cautiously and avoid situations which
could cause kickback.
–Hold the saw firmly with both hands and main‐
tain a secure grip.
–always cut at full throttle.
–Be aware of the location of the guide bar nose
at all times.
–do not cut with the bar nose.
–Take special care with small, tough limbs, they
may catch the chain.
–never cut several limbs at once.
–do not overreach.
–never cut above shoulder height.
–Use extreme caution when re-entering a previ‐
ous cut.
–Do not attempt plunge cuts if you are not
experience 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, prop‐
erly tensioned chain – the depth gauge setting
must not be too large.
–Use a low kickback chain and a narrow radius
guide bar.
3 Reactive Forces English
0458-756-0121-B 7

3.5 Pull-in (A)
001BA037 KN
A
Pull-in occurs when the chain on the bottom of
the bar is suddenly pinched, caught or encoun‐
ters a foreign object in the wood. The reaction of
the chain pulls the saw forward – to reduce this
risk, always engage the spiked bumper securely
in the tree or limb.
3.6 Pushback (B)
001BA038 KN
B
Pushback occurs when the chain on the top of
the bar is suddenly pinched, caught or encoun‐
ters a foreign object in the wood. The reaction of
the chain drives the saw straight back toward the
operator – to avoid this risk:
–Be alert to situations that may cause the top of
the guide bar to be pinched
–Do not twist the guide bar in the cut
3.7 Exercise extreme caution
–with leaners
–with trees that have fallen unfavorably
between other trees and are under strain
–when working in blowdown areas.
In these cases, do not use a chain saw – use a
hoist, winch or drag line instead.
Pull out exposed and cleared logs. Select clear
area for cutting.
Deadwood (dry, decayed or rotted wood) repre‐
sents a considerable risk that is difficult to
assess. Identifying the extent of the dangers is
complicated, if not impossible. Use aids such as
a cable winch or tractor in such cases.
When felling in the vicinity of roads, railways,
power lines, etc., take extra precautions. If nec‐
essary, inform the police, utility company or rail‐
way authority.
4 Working Techniques
Only specially trained persons may perform cut‐
ting and felling operations and all other associ‐
ated work (plunge cutting, limbing, etc.). To
reduce the risk of accidents and injury, do not
attempt felling or limbing if you are not an experi‐
enced chainsaw user.
Gasoline chain saws are more suitable than
electric saws for felling and limbing. The freedom
of movement necessary for this work is restricted
by the connecting cord.
Your electric chain saw is unsuitable for cutting
in blowdown areas and must not be used for
such work.
However, if a tree is to be felled and limbed with
an electric saw against this recommendation, it is
essential to observe country-specific regulations
on felling techniques.
4.1 Sawing
Work calmly and carefully – in daylight conditions
and only when visibility is good. Ensure you do
not endanger others – stay alert at all times.
It is advisable for first-time users to practice cut‐
ting logs on a sawbuck – see "Sawing thin
wood".
Use the shortest possible guide bar: The chain,
guide bar and chain sprocket must match each
other and your saw.
001BA082 KN
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.
English 4 Working Techniques
8 0458-756-0121-B

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.
Be careful when cutting scrub and young trees.
Thin shoots can be scooped up by the chain saw
and hurled towards the user.
Be careful when cutting splintered wood – Risk of
injury from ejected pieces of wood!
Make sure your saw does not touch any foreign
materials: Stones, nails, etc. may be flung off
and damage the saw chain. The chain saw may
kick back unexpectedly – risk of accident!
If a rotating saw chain hits a stone or another
hard object, sparks may be generated which may
ignite easily flammable materials under certain
conditions. Also dried-out plants and brushwood
are combustible, above all in hot and dry
weather. If there is a risk of fire, do not use the
chain saw in the vicinity of easily combustible
materials, dry plants or scrub. It is mandatory
that you ask the responsible forestry office about
the current fire hazard.
001BA033 KN
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 use the machine while standing on a
ladder or in a tree
–Never work on an insecure support
–Never work above shoulder height
–Never use the machine with just 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 hold the spiked bumper securely against
the tree or limb.
At the end of the cut, the chain saw is no longer
supported by the cutting attachment in the cut.
The chain saw's weight must be borne by the
user – risk of loss of control!
Sawing thin wood:
–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 possi‐
ble.
–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 the cuts in the correct order (first
compression side (1), then tension side (2)), oth‐
erwise the cutting attachment may stick in the cut
or kick back – risk of injury!
1
001BA151 KN
2
1
001BA152 KN
2
► Make relieving cut at the compression side (1)
► Make bucking cut at the tension side (2)
Be wary of pushback when making bucking cut
from the bottom upwards (underbuck).
4 Working Techniques English
0458-756-0121-B 9

NOTICE
Do not cut a lying log at a point where it is touch‐
ing the ground because the saw chain will other‐
wise be damaged.
Ripping:
001BA189 KN
Sawing technique without use of the spiked
bumper – risk of pull-in – position the guide bar at
as shallow an angle as possible – be especially
careful – increased risk of kickback!
4.2 Preparing for felling
Check that there are no other persons in the fell‐
ing area – other than helpers.
Make sure no-one is endangered by the falling
tree – the noise of your engine may drown any
warning calls.
001BA088 LÄ
2
/
12
11
/
12
Maintain a distance of at least 2 1/2 tree lengths
from the next felling site.
Determining 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 inclination of the tree
–Unusually heavy limb structure, asymmetrical
growth, damage to tree
–The wind direction and speed – do not fell 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)
001BA040 KN
B
B
A Direction of fall
B Escape path (escape routes)
–Establish escape paths for each worker –
approx. 45° diagonally opposite to the direc‐
tion of fall
–Clear escape paths, eliminate obstacles
–Put down tools and equipment at a safe dis‐
tance – but not on the escape paths
–When felling, stand only to the side of the fall‐
ing trunk and only move back laterally onto the
escape path
–Plan escape paths on slopes 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.
–Carefully clear the base of the trunk (e.g., with
an axe) – sand, stones and other foreign
objects will blunt the saw chain
001BA146 KN
English 4 Working Techniques
10 0458-756-0121-B

–Remove largest buttresses: first the largest
buttress – saw first vertically, then horizontally
– only if the tree is in sound condition
4.3 Felling notch
Preparing the felling notch
001BA271 KN
C
C
The felling notch (C) determines the direction of
fall.
Important:
–Make a felling notch at right angle to direction
of fall
–Saw as close to the ground as possible
–Cut to a depth of approx. 1/5 to 1/3 of the
diameter of the trunk
Specify the direction of fall – without the gunning
sight on the shroud and fan housing
If the chain saw is designed without the gunning
sight on the shroud and fan housing, the direc‐
tion of fall can be determined or controlled using
a meter stick:
001BA246 KN
► Snap the meter stick in the middle and create
an isosceles triangle
► Position both ends of the meter stick in the
front trunk area (1/5 to max. 1/3 of the trunk
diameter) – align the tip of the meter stick in
the defined direction of fall
► Mark the trunk at both ends of the meter stick
to limit the felling notch
Making the felling notch
001BA247 KN
When making a felling notch, align the chainsaw
so that the notch lies at a right angle to the direc‐
tion of fall.
During the procedure, various sequences are
permitted for making a felling notch with a bottom
(horizontal) cut and top (angled) cut – comply
with national legislation regarding felling techni‐
que.
► Make the bottom cut (horizontal cut) – until the
guide bar reaches both markings
► Make the top (angled) cut approx. 45°‑ 60° to
the bottom cut
Checking the direction of fall
The bottom cut and top cut must meet in a con‐
tinuous straight sink chord.
001BA243 KN
► Position the meter stick at the pivot point of
the sink chord – the tip of the meter stick must
point in the direction of the specified direction
of fall – where necessary, correct the direction
of fall by cutting the felling notch accordingly
4 Working Techniques English
0458-756-0121-B 11

4.4 Sapwood cuts
001BA150 KN
Sapwood cuts in long-fibered softwood help pre‐
vent 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.
4.5 Basic information on felling cut
Basic dimensions
001BA259 KN
G
E
C
C
Ø
1/10
The felling notch (C) determines the direction of
fall.
The hinge (D) functions like a real hinge to guide
the tree to the ground.
–Width of hinge: approx. 1/10 of the trunk diam‐
eter
–Never saw through the hinge while felling –
otherwise the tree will fall in a direction other
than the one planned – risk of accident!
–With rotten trunks, leave a wider hinge
The tree is felled with the felling cut (E).
–Cut horizontally
–1/10 (min. 3 cm) of the width of the hinge (D)
across the bottom of the felling notch (C)
The holding wood (F) or safety strip (G) supports
the tree and secures it against premature falling.
–Width of strip: approx. 1/10 to 1/5 of the trunk
diameter
–Do not cut into the strip during the felling cut
–With rotten trunks, leave a wider strip
Plunge cutting
–For relieving cuts during shortening
–For wood carving
001BA269 KN
3.
1.
2.
► Use a low kickback saw chain and proceed
with special care
1.Begin cut by applying the lower portion of the
guide bar nose – do not use upper portion
because of risk of kickback. Cut at full strength
until the depth of the kerf is twice the width of the
guide bar2.Swing the machine slowly into the
plunge cutting position – risk of kickback and
pushback!3.Make the plunge cut very carefully.
Risk of pushback.
001BA270 KN
Where possible, use a plunge blade. The plunge
blade and the upper/lower side of the guide bar
are parallel.
During plunge cutting, the plunge bar helps to
keep the hinge parallel in form, i.e. the same
thickness at all points. To do this, guide the
plunge bar parallel to the sink chord.
Felling wedges
Insert the felling wedge as soon as possible, i.e.
as soon as no obstruction of saw control is to be
expected. Position the felling wedge in the felling
cut and drive in with suitable tools.
Only use aluminum or plastic wedges – do not
use steel wedges. Steel wedges can seriously
damage the saw chain and cause dangerous
kickback.
English 4 Working Techniques
12 0458-756-0121-B

Select suitable felling wedges dependent on the
trunk diameter and the width of the kerf (ana‐
logue to felling cut (E)).
Contact the STIHL dealer for the selection of the
felling wedge (suitable length, width and height).
4.6 Selecting the appropriate felling
cut
The selection of the appropriate felling cut is
dependent on the same tree characteristics that
must be noted when determining the direction of
fall and the escape paths.
There are various different features of these
characteristics. This User Manual will only
describe the two most commonly occurring var‐
iants:
001BA260 KN
left: Normal tree – vertically upright tree
with uniform crown
right: Leaner tree - crown pointing in direc‐
tion of fall
4.7 Felling cut with stabilizing strap
(normal tree)
A) Thin trunks
Implement this felling cut when the trunk diame‐
ter is smaller than the cutting length of the chain‐
saw.
001BA261 KN
1.
2.
Shout a warning before starting the felling cut.
► Plunge cut the felling cut (E) – plunge the
guide bar fully in
► Engage the spiked bumper behind the hinge
and use this as the rotation point – reposition
the chainsaw as little as possible
► Make the felling cut up to the hinge (1)
–Do not cut into the hinge
► Make the felling cut up to the stabilizing
strap (2)
–Do not cut into the stabilizing strap
001BA273 KN
3.
► Set the felling wedge (3)
Shout a second warning immediately before the
tree falls.
► Cut through the stabilizing strap, horizontal
level with the felling cut, with arms fully exten‐
ded
B) Thick trunks
Implement this felling cut when the trunk diame‐
ter is greater than the cutting length of the
machine.
001BA263 KN
4. 5.
1.
2. 3.
Shout a warning before starting the felling cut.
► Engage the spiked bumper at the height of the
felling cut and use this as the rotation point –
reposition the chainsaw as little as possible
► Tip of the guide bar must penetrate the wood
before the hinge (1) – guide the chainsaw
absolutely horizontally and swivel as widely as
possible
► Make the felling cut up to the hinge (2)
–Do not cut into the hinge
► Make the felling cut up to the stabilizing
strap (3)
4 Working Techniques English
0458-756-0121-B 13

–Do not cut into the stabilizing strap
The felling cut must be continued on the oppo‐
site side of the trunk.
Ensure that the second cut is at the same level
as the first cut.
► Plunge cut the felling cut
► Make the felling cut up to the hinge (4)
–Do not cut into the hinge
► Make the felling cut up to the stabilizing
strap (5)
–Do not cut into the stabilizing strap
001BA274 KN
6.
► Set the felling wedge (6)
Shout a second warning immediately before the
tree falls.
► Cut through the stabilizing strap, horizontal
level with the felling cut, with arms fully exten‐
ded
4.8 Felling Cut with Holding Strap
(Leaner)
A) Thin trunks
Implement this felling cut when the trunk diame‐
ter is smaller than the cutting length of the chain‐
saw.
001BA265 KN
1. 2.
► Plunge cut the guide bar into the trunk until it
exits on the other side
► Make the felling cut (E) towards the hinge (1)
–Cut horizontally
–Do not cut into the hinge
► Make the felling cut towards the holding strap
(2)
–Cut horizontally
–Do not cut into the holding strap.
001BA266 KN
Shout a second warning immediately before the
tree falls.
► With outstretched arms, cut through the hold‐
ing strap at a downward angle from outside.
B) Thick trunks
001BA267 KN
1.
2. 3.
4.
5. 6.
Perform this felling cut when the tree diameter is
greater than the cutting length of the chainsaw.
► Engage the bumper spike behind the holding
wood and use this as the rotation point – repo‐
sition the chain saw as little as possible
► The guide bar nose enters the wood (1) before
it reaches the hinge – hold the chainsaw hori‐
zontally and swing it as far as possible.
–Do not cut into the holding strap or hinge.
► Make the felling cut up to the hinge (2)
–Do not cut into the hinge
► Make the felling cut up to the holding strap (3)
–Do not cut into the holding strap.
The felling cut must be continued on the oppo‐
site side of the trunk.
Ensure that the second cut is at the same level
as the first cut.
► Engage the spiked bumper behind the hinge
and use this as the rotation point – reposition
the chainsaw as little as possible
► Tip of the guide bar must penetrate the wood
before the holding strap (4) – guide the chain‐
saw absolutely horizontally and swivel as
widely as possible
► Make the felling cut up to the hinge (5)
English 4 Working Techniques
14 0458-756-0121-B

–Do not cut into the hinge
► Make the felling cut up to the holding strap (6)
–Do not cut into the holding strap.
001BA268 KN
Shout a second warning immediately before the
tree falls.
► With outstretched arms, cut through the hold‐
ing strap at a downward angle from outside.
5 Packing List
Remove the machine from the box and check
that you have all the following items:
–Electric chainsaw
–Guide bar
–Saw chain
–Chain scabbard
–Instruction manual
Only models without quick chain tensioner
–Combination wrench
6 Cutting Attachment
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.
001BA248 KN
1
2
3
a
–The pitch (t) of the saw chain (1), chain
sprocket and the nose sprocket of the Rollo‐
matic 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 cut‐
ting attachment may be damaged beyond repair
after a short period of operation.
6.1 Chain Scabbard
001BA244 KN
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 cor‐
rect length which covers the complete guide bar.
The length of the matching guide bars is marked
on the side of the chain scabbard.
7 Mounting the Bar and
Chain (side chain ten‐
sioner)
WARNING
Do not connect the power tool to the wall outlet
yet.
7.1 Removing the chain sprocket
cover
9931BA034 KN
► Unscrew the nut and remove the chain
sprocket cover.
5 Packing List English
0458-756-0121-B 15

2
1
9931BA017 KN
► Turn the tensioning screw (1) counterclock‐
wise until the tensioner slide (2) butts against
the left end of the housing slot.
7.2 Disengage the chain brake.
9931BA015 KN
► Pull the hand guard towards the front handle
until there is an audible click – the chain brake
is disengaged.
7.3 Fitting the chain
WARNING
Wear work gloves to protect your hands from the
sharp cutters.
143BA003 KN
► Fit the chain – start at the bar nose.
4
3
2
2
1
9931BA018 KN
► Turn the guide bar so that the chain is posi‐
tioned as shown in the pictogram (1) – the
arrows show the chain's direction of rotation.
► Fit the guide bar over the studs (2) and
engage the tensioner slide in the hole (3) –
place the chain over the sprocket (4) at the
same time.
5
9931BA026 KN
► Turn the tensioning screw (5) 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.
► Refit the sprocket cover and tighten the nut
only moderately by hand – finally tighten the
nut only after tensioning the saw chain.
► Go to chapter on "Tensioning the Saw Chain"
English 7 Mounting the Bar and Chain (side chain tensioner)
16 0458-756-0121-B

8 Mounting the Bar and
Chain (quick chain ten‐
sioner)
WARNING
Do not connect the power tool to the wall outlet
yet.
8.1 Removing the chain sprocket
cover
3
9931BA019 KN
1
► Pull the hinged handle (1) out until it engages
in the upright position.
► Turn the wingnut (2) counterclockwise until it
hangs loose in the sprocket cover (3).
► Remove the chain sprocket cover (3).
8.2 Fitting the tensioning gear
9931BA025 KN
1
► Remove the tensioning gear (1) and turn it
over.
2310BA015 KN
2
► Take out the screw (2).
1
3
2310BA016 KN
► Line up the tensioning gear (1) and guide
bar (3).
2
2310BA017 KN
► Insert the screw (2) and tighten it down firmly.
8.3 Disengage the chain brake.
9931BA015 KN
► Pull the hand guard towards the front handle
until there is an audible click – the chain brake
is disengaged.
8 Mounting the Bar and Chain (quick chain tensioner) English
0458-756-0121-B 17

8.4 Fitting the chain
WARNING
Wear work gloves to protect your hands from the
sharp cutters.
1
181BA012 KN
► Fit the chain – start at the bar nose. Pay atten‐
tion to the position of the tensioning gear and
the cutting edges.
► Turn the tensioning gear (1) clockwise as far
as stop.
► Turn the guide bar so that the tensioning gear
is facing you.
2
3
181BA013 KN
► Fit the chain over the sprocket (2).
► Push the guide bar over the bar stud (3), the
head of the rear bar stud must engage the
slot.
9931BA020 KN
► Make sure the drive link tangs engage the bar
groove (arrow) and then rotate the tensioning
gear counterclockwise as far as stop.
9931BA021 KN
► Place the chain sprocket cover in position and
engage the guide lugs in the recesses in the
handle housing.
4
9931BA022 KN
5
When fitting the chain sprocket cover, check that
the teeth of the tensioning gear and adjusting
wheel mesh properly.
► If necessary, turn the adjusting wheel (4)
slightly until the sprocket cover can be pushed
flush against the handle housing.
► Pull the hinged handle (5) out until it engages
in the upright position.
► Fit the wingnut and tighten it moderately –
finally tighten the wingnut by hand only after
tensioning the saw chain.
► Go to chapter on "Tensioning the Saw Chain"
English 8 Mounting the Bar and Chain (quick chain tensioner)
18 0458-756-0121-B

9 Tensioning the Saw Chain
(side chain tensioner)
9931BA023 KN
1
Retensioning during cutting work:
► Disconnect the plug from the wall outlet.
► Loosen the nut.
► Hold the bar nose up.
► Use a screwdriver to turn the tensioning
screw (1) clockwise until the chain fits snugly
against the underside of the bar.
► While still holding the bar nose up, tighten
down the nut firmly.
► Go to "Checking Chain Tension".
A new chain has to be retensioned more often
than one that has been in use for some time.
► Check chain tension frequently – see chapter
on "Operating Instructions".
10 Tensioning the Saw Chain
(quick chain tensioner)
9931BA024 KN
1
2
Re-tensioning during cutting work:
► Disconnect the power plug
► Fold out the wings of the wing nut and loosen
the wing nut
► Turn the adjusting wheel (1) to the right as far
as possible
► Tighten the wing nut (2) by hand
► Fold in the wings of the wing nut
► Next step: Continue with "Checking Chain
Tension"
A new saw chain has to be re-tensioned more
often than one that has been in use for some
time.
► Check chain tension frequently – see chapter
on "Operating Instructions"
11 Checking Chain Tension
1
9931BA012 KN
► Disconnect the plug from the wall outlet.
► Wear work gloves to protect your hands.
► Disengage the chain brake: Pull the hand
guard (1) against the front handle and hold it
there – the chain brake and coasting brake are
disengaged in this position.
► The chain must fit snugly against the under‐
side of the bar and it must still be possible to
pull the chain along the bar by hand.
► If necessary, retension the chain.
A new chain has to be retensioned more often
than one that has been in use for some time.
► Check chain tension frequently – see chapter
on "Operating Instructions".
12 Chain Lubricant
For automatic and reliable lubrication of the
chain and guide bar – use only an environmen‐
tally compatible quality chain and bar lubricant.
Rapidly biodegradable STIHL BioPlus is recom‐
mended.
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 formu‐
lated chain lubricant.
9 Tensioning the Saw Chain (side chain tensioner) English
0458-756-0121-B 19

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 lubricat‐
ing properties and is unsuitable for chain lubrica‐
tion.
13 Filling Chain Oil Tank
13.1 Preparations
9931BA039 KN
1
► Thoroughly clean the oil filler cap (1) and the
area around it to ensure that no dirt falls into
the tank.
► Position the machine so that the filler cap
faces up.
13.2 Opening the filler cap
001BA236 KN
► Raise the grip until it is upright.
001BA251 KN
► Turn the cap counterclockwise (about a quar‐
ter turn).
001BA252 KN
Marks on filler cap and oil tank must line up.
001BA237 KN
► Remove the cap.
13.3 Filling up with chain oil
Take care not to spill chain oil while refilling and
do not overfill the tank.
STIHL recommends you use the STIHL filler noz‐
zle for chain oil (special accessory).
► Filling up with chain oil
English 13 Filling Chain Oil Tank
20 0458-756-0121-B