Page 1
STIH)
STIHL 070
Instruction Manual
Page 2
Contents
English
Guide to Using this Manual .............. 2
Safety Precautions and
Working Techniques ......................... 3
Mounting the Bar and Chain ........... 17
Tensioning the Saw Chain
(Front chain tensioner) ................... 18
Checking Chain Tension ................. 19
BA_SE_197_001_01_02.fmPrinted on chlorine-free paper.
Fuel ................................................ 19
Fueling ............................................ 20
Chain Lubricant .............................. 21
Filling Chain Oil Tank ...................... 22
Checking Chain Lubrication ........... 22
Starting / Stopping the Engine ........ 23
Operating Instructions .................... 25
Adjusting Oil Flow ........................... 26
Taking Care of Guide Bar ............... 27
Cleaning the Air Filter ..................... 28
Adjusting the Carburetor ................ 28
Checking the Spark Plug ................ 30
Replacing the Starter Rope
and Rewind Spring ......................... 31
Storing the Machine ........................ 33
Checking and Replacing
Chain Sprocket ............................... 34
Maintaining and Sharpening
Saw Chain ...................................... 36
Printing inks contain vegetable oils; paper can be recycled.
Maintenance Chart ......................... 40
Minimize Wear and
Avoid Damage ................................ 42
Main Parts and Controls ................. 43
Specifications ................................. 44
Special Accessories ....................... 45
Ordering Spare Parts ...................... 45
Maintenance and Repairs ............... 45
Quality Certification ........................ 46
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
This machine 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 machine.
Please contact your dealer or our
sales company if you have any
queries concerning your machine.
Hans Peter Stihl
STIHl
© ANDREAS STIHL AG & Co. KG, 2008
0458 106 0121. M2,7. K8. FST. Printed in Germany
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Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
: A bullet marks a step or procedure
without direct reference to an
illustration.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Caution where there is a risk of
damaging the machine or its
individual components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s understanding of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual may refer to
several models with different
features. Components that are not
installed on all models and related
applications are marked with an
asterisk (*). Such components may
be available as special accessories
from your STIHL dealer.
Engineering improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore some changes, modifications
and improvements may not be covered
in this manual.
2
070
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Safety Precautions and Working Techniques
English
Because a chainsaw is a
high-speed wood-cutting
tool with very sharp
cutters, some special
safety precautions must
be observed in addition to those that
generally apply when working with an
axe or hand saw.
It is important that you
read and understand the
instruction manual before
using your chainsaw for
the first time and keep it in
a safe place for future
reference. Non-observance of the safety
precautions may result in serious or
even fatal injury.
Always observe local safety regulations,
standards and ordinances.
If you have never used this chainsaw
model before:
Have your STIHL dealer or other
experienced user show you how to
operate your chainsaw or attend a
special course of training in chainsaw
operation.
Minors should never be allowed to use a
chainsaw. Children, bystanders and
animals should not be allowed in the
area where a chainsaw is in use.
When the machine is not in use (work
break), shut it off so that it does not
endanger others and secure it against
unauthorized use.
The chainsaw user is responsible for
accidents or risks involving third parties
or their property.
Do not lend or rent your chainsaw
without the instruction manual. Be sure
that anyone using your saw understands
the information contained in this manual.
You must be rested, healthy and in good
physical condition to operate a power
tool.
Persons with pacemakers only:
The ignition system of your unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with pacemaker should consult
their physician and the pacemaker
manufacturer before operating this tool.
Do not operate this power tool while
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).
Use your saw for cutting wood or
wooden objects only.
Do not use your chainsaw for any other
purpose since this may result in
accidents or damage to the machine.
Never attempt to modify your chainsaw
in any way since this can be extremely
dangerous and may also result in
accidents or damage to the machine.
Only use tools, guide bars, chains, chain
sprockets and accessories that are
explicitly approved for this chainsaw
model by STIHL or are technically
identical. If you have any questions in
this respect, consult a specialist dealer.
Use only high quality replacement parts
since there is otherwise a risk of
accidents or damage to the machine.
STIHL recommends the use of STIHL
original tools, guide bars, chains, chain
sprockets and accessories. The
characteristics of these components are
specifically designed to match your
chainsaw model and meet your
performance requirements.
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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 – an overall and
jacket combination is
recommended, do not wear a coat
Do not wear loose-fitting garments,
scarves, jewelery or anything that could
restrict movement or become entangled
with the saw, wood or brush. Tie up and
confine long hair (e.g. with a hair net,
cap, hard hat, etc.).
Wear steel-toed safety
boots with non-slip soles.
Wear a safety hard hat
where there is a danger of
head injuries from falling
objects.
Wear safety glasses or a
face shield and hearing protection, e.g.
ear plugs or ear muffs.
Wear heavy-duty
gloves, preferably made
of leather.
STIHL offers a comprehensive range of
safety clothing and equipment.
Transporting the Chainsaw
Always fit the chain guard (scabbard)
before carrying the saw short distances.
Also stop the engine before carrying the
saw longer distances (more than about
50 m).
Always carry the saw by the front handle
(handlebar) – with the hot muffler away
from your body – the guide bar must
point to the rear. To avoid serious burn
injuries, avoid touching hot parts of the
machine, especially the surface of the
muffler.
Transporting by vehicle: When
transporting in a vehicle, properly secure
your saw to prevent turnover, fuel
spillage and damage.
Fueling
Gasoline is an
extremely flammable
fuel. Keep clear of naked
flames and fire. Do not
spill any fuel – do not
smoke.
Stop the engine before refueling.
Do not refuel while the engine is still hot
since fuel may overflow and catch fire.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly.
Fuel your chainsaw in a well-ventilated
area, outdoors only. If you spill fuel, wipe
the saw immediately – if fuel gets on
your clothing, change immediately.
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Different models may be equipped with
different fuel caps.
After fueling, tighten down
the screw-type fuel cap as
securely as possible.
Insert the fuel cap with
hinged grip (bayonet type
cap) correctly in the
opening, turn it clockwise
as far as stop and fold the
grip down.
This reduces the risk of unit vibrations
causing the fuel 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:
– Check operation of front hand guard
– Correctly mounted guide bar
– Correctly tensioned chain
– Smooth action of throttle trigger and
throttle trigger interlock – throttle
trigger must return automatically to
idle position
– Master control/stop switch must
move easily to STOP or 0
– Check that 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
– Keep the handles dry and clean –
free from oil and pitch – for safe
control.
To reduce risk of personal injury, do not
operate your saw if it is damaged or not
properly assembled.
Starting the Engine
Start the engine at least 3 meters from
the fueling spot, outdoors only.
Your chainsaw is a one-person saw. Do
not allow other persons near the running
chainsaw. Start and operate your saw
without assistance.
To reduce the risk of injury, be wary of
chain rotation during starting.
Do not drop start the chainsaw.
The correct starting procedure is
described in your instruction manual.
Do not attempt to start the saw when the
saw chain is in a cut.
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During Operation
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the Master
Control / stop switch to $ or d.
Never allow the chainsaw to run
unattended.
When the engine is running:
Note that the chain continues to rotate
for a short period after you let go of the
throttle trigger – flywheel effect.
Take special care in slippery conditions
– damp, snow, ice, on slopes, uneven
ground and on freshly debarked logs.
Avoid stumbling on stumps, roots, rocks
or in ditches.
Ensure you always have a firm and safe
footing.
Do not work alone – keep within calling
distance of others in case help is
needed.
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.
To reduce risk of fire, keep hot exhaust
gases and hot muffler away from easily
combustible materials (e.g. wood chips,
bark, dry grass, fuel).
Mufflers with a catalytic converter can
become particularly hot.
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These fumes
may be colorless and
odorless and contain
unburned hydrocarbons and benzol.
Never run the engine indoors or in poorly
ventilated locations, even if your model
is equipped with a catalytic converter.
To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.
To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.
The dusts (e.g. sawdust), vapor and
smoke produced during operation may
be dangerous to health. If the work area
is very dusty, wear a respirator.
To reduce risk of fire, do not smoke
while operating or standing near your
power tool. Note that combustible fuel
vapor may escape from the fuel system.
If your power tool 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”.
Check the fuel system for leaks and
make sure the safety devices are
working properly. Do not continue
operating your power tool if it is
damaged. In case of doubt, have the
machine checked by your servicing
dealer.
Make sure the chain does not rotate
while the engine is idling. If necessary,
adjust idle speed properly. If the chain
still rotates, have the saw checked by
your servicing dealer.
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Reactive Forces
The most common reactive forces that
occur during cutting are: kickback,
pushback and pull-in.
Dangers of kickback
Kickback can result
in serious or fatal
injury.
Kickback occurs when the saw is
suddenly thrown up and back in an
uncontrolled arc towards the operator.
Kickback occurs, e.g.
– when the upper quadrant of the bar
nose unintentionally contacts wood
or another solid object, e.g. when
another limb is touched accidentally
during limbing.
– when the chain at the nose of the
guide bar is pinched in the cut.
001BA036 KN
To reduce the risk of kickback:
– Work cautiously and avoid
situations which could cause
kickback.
– 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
001BA093 LÄ
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 previous 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, properly tensioned
chain – the depth gauge setting
must not be too large.
– Use a low kickback chain and a
narrow radius guide bar.
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A = Pull-in
A
Pull-in occurs when the chain on the
bottom of the bar is suddenly pinched,
caught or encounters a foreign object in
the wood. The reaction of the chain pulls
the saw forward.
Always hold the spiked bumper
securely against the tree or limb.
B = Pushback
001BA037 KN
Pushback occurs when the chain on the
top of the bar is suddenly pinched,
caught or encounters a foreign object in
the wood. The reaction of the chain
drives the saw straight back toward the
operator.
To avoid pushback:
– 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.
B
Exercise extreme caution:
– with leaners
– with trees that have fallen
unfavorably between other trees
and are under strain
– when working in blowdown areas.
Do not work with the chainsaw in such
circumstances. Use block and tackle,
001BA038 KN
cable winch or tractor.
Pull out exposed and cleared logs.
Select clear area for cutting.
Deadwood (dry, decayed or rotted
wood) represents 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 necessary, inform the
police, utility company or railway
authority
8
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Holding and Controlling the Saw
English
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 handles.
Cutting
Do not operate your chainsaw 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.
Use the shortest possible guide bar: The
chain, guide bar and chain sprocket
must match each other and your saw.
001BA087 LÄ
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 chainsaw for cutting only. It is
not designed for prying or shoveling
away limbs, roots or other objects.
Do not underbuck freely hanging limbs.
To reduce the risk of injury, take special
care when cutting shattered wood –
sharp slivers of wood may be caught
and flung in your direction.
Make sure your saw does not touch any
foreign materials:
Stones, nails, etc. may be flung off,
damage the saw chain or cause the saw
to kick back unexpectedly.
001BA082 KN
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 work on a ladder
– Never work in a tree
– Never work on any other insecure
support
– Do not work above shoulder height
– Never operate the saw with one
hand
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1
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.
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 saw since it might otherwise go out
of control.
Felling and Limbing
To reduce the risk of accidents and
injury, do not attempt felling or limbing
unless you have been trained in the
necessary techniques.
Observe all country-specific regulations
on felling techniques.
Check that there are no other persons in
the felling area – other than helpers.
Make sure no-one is endangered by
falling tree – the noise of your engine
may drown any warning calls.
1
/
2
1
/
2
2
Maintain a distance of at least 2
lengths from next felling site.
1
1
/2 tree
Determine direction of fall and
escape paths
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)
001BA088 LÄ
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B
45°
A
45°
B
A = Direction of fall
B = Escape paths
– 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
001BA040 KN
saw chain.
– Remove large buttress roots: Make
vertical cut first, then horizontal –
but only if wood is sound.
Felling notch
001BA153 KN
When making the felling notch, make
use of the gunning sight on the shroud
and housing to check the planned
direction of fall.
Position your saw so that the gunning
sight points in exactly in the direction
you want the tree to fall.
There are several approved methods for
making the felling notch – observe
country-specific regulations on felling
techniques.
STIHL recommends the following
method:
001BA146 KN
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C
C
The felling notch (C) determines the
direction of fall.
: Make the horizontal cut – check the
direction of fall with the gunning
sight.
: Make angle cut at about 45°.
: Check the felling notch and correct it
if necessary.
Important:
– Felling notch at a right angle to the
planned direction of fall.
– As close to ground as possible.
– Cut to a depth of about
the trunk diameter.
1
/5 to 1/3 of
001BA143 KN
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
trunk diameter. On large diameter trees,
cut to no more than width of guide bar.
Do not make sapwood cuts if wood is
diseased.
1
/10 of
D
001BA150 KN
Felling
Shout a warning before starting the
felling cut.
– Make the felling cut (D) slightly
higher than bottom of felling notch.
– Cut horizontally.
– Leave approx.
uncut between felling cut and felling
notch. This is the hinge.
1
/10 of tree diameter
D
001BA144 KN
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Page 14
E
E
English
1
– Drive wedges into the felling cut in
good time. Use only wooden,
aluminum or plastic wedges. Never
steel, which can damage the chain
and cause kickback.
– The hinge (E) helps control the
falling tree.
– Do not cut through the hinge – you
could lose control of the direction of
fall – this could result in an accident.
001BA145 KN
– Leave a broader hinge on rotten
trees.
Shout a second warning immediately
before the tree falls.
Small diameter trees:
simple fan cut
Apply the spiked bumper behind the
hinge – pivot the saw around this point only as far as the hinge. The spiked
bumper rolls against the trunk.
001BA147 KN
Large diameter trees:
sectioning method
If the diameter of the tree is greater than
the length of the guide bar, use the
sectioning method.
Use the spiked bumper as a pivot –
avoid repositioning the saw more than
necessary.
First cut (1):
Nose of guide bar should enter wood
just behind the hinge – hold the saw
horizontally and swing it as far as
possible.
001BA148 KN
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2
4
When repositioning for the next cut (2),
keep the guide bar fully engaged in the
kerf to keep the felling cut straight –
apply the spiked bumper again.
Insert a wedge (3) in the cut.
Last cut (4):
Apply the spiked bumper as for the
simple fan cut – do not cut through the
hinge!
Plunge cutting
Do not attempt plunge cuts if you are not
experience in this cutting technique.
– Use a low kickback chain and
exercise particular caution
– For heartwood cut
– For felling leaners
– For relieving cuts during bucking
– For DIY projects
3
2
1
Begin cut by applying lower portion of
the guide bar nose (1) – do not use
upper portion because of risk of
kickback. Cut until depth of kerf is twice
the width of the guide bar.
Swing saw slowly (2) into plunge-cutting
position. Take care because of the risk of
kickback or pushback.
Make the plunge cut (6) very carefully.
Danger of pushback.
Heartwood cut
Enlarge the plunge cut to both sides as
shown
– if tree diameter is more than twice
the length of the guide bar.
– if a large portion of heartwood
remains uncut on large diameter
trees.
– on trees that are difficult to fell (oak,
beech), to prevent heartwood
splintering and maintain planned
direction of fall.
– on soft deciduous trees to relieve
tension in lying log and prevent
slivers in the center of the hinge
being torn out of the log.
001BA179 KN
: Carefully make the plunge cut in the
felling notch – there is a danger of
pushback at this point – then
swing the bar in the direction of the
arrow.
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Limbing
– Use a low kickback chain.
– Work with the saw supported
wherever possible.
– Do not work with the bar nose.
– Watch for limbs which are under
tension.
– Never attempt to cut several limbs
at once.
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.
Lying or standing logs under tension:
Risk of pinching!
1
2
2
1
Always start relieving cut at the
compression side (1).
Make relieving cut and then perform
bucking cut at the tension side (2) –
the saw will otherwise pinch or kick
back.
Vibrations
Prolonged use of the unit 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
001BA151 KN
001BA152 KN
gloves)
–breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, itching).
– Low outside temperatures.
– Gripping force (a tight grip hinders
circulation).
Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
symptoms appear, seek medical advice.
If not otherwise possible, make the
bucking cut from the bottom upwards
(underbuck) – be wary of pushback.
Do not cut a lying log at a point where it
is touching the ground because the saw
chain will otherwise be damaged.
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Maintenance and Repairs
Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the instruction manual.
Have all other work performed by a
servicing dealer.
SSTIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and receive technical
information bulletins on engineering
changes.
Use only high quality replacement parts
since there is otherwise a risk of
accidents or damage to the machine. If
you have any questions in this respect,
consult a servicing dealer.
STIHL recommends you use only
original STlHL replacement parts. The
characteristics of these parts are
specifically designed to match your
chainsaw model and meet your
performance requirements.
To r e duc e the risk of injury from
unintentional engine startup and chain
rotation, always shut off the engine
and disconnect the spark plug boot
before performing any repairs,
maintenance or cleaning work. –
Exception: Carburetor and idle speed
adjustments.
To reduce the risk of fire, do not service
or store your machine near open flames.
Check the fuel filler cap for leaks at
regular intervals.
Use only a spark plug of the type
approved by STIHL and make sure it is
in good condition – see "Specifications".
Inspect ignition lead (insulation in good
condition, secure connection).
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed unless the slide control /
stop switch is on STOP or 0 since there
is otherwise a risk of fire from
uncontained sparking.
Check condition of the muffler at regular
intervals.
To reduce the risk of fires and damage to
hearing, do not operate your machine if
the muffler is damaged or missing.
Do not touch a hot muffler since burn
injury will result.
Vibration behavior is influenced by the
condition of the AV elements – check
the AV elements at regular intervals.
Check the chain catcher –
and replace it if damaged.
Shut off the engine
– before checking chain tension.
– before retensioning the chain.
– before replacing the chain.
– before rectifying problems.
Observe sharpening instructions
for safe and correct handling of saw
chain and guide bar.
Keep the chain in good condition at all
times. It must be properly sharpened,
tensioned and well lubricated.
Always change the chain, guide bar and
sprocket in good time.
Check condition of clutch drum
periodically.
Store fuel and chain lubricant in properly
labelled, safety-type canisters only. Take
care when handling gasoline. Avoid
direct contact with the skin and avoid
inhaling fuel vapour.
16
070
Page 18
Mounting the Bar and Chain
English
1
a
t = a : 2
ou can run chains of different pitches on
this chainsaw – depending on the chain
sprocket (see “Specifications“):
The chain pitch (1) must match the guide
bar. The drive link gauge (2) must match
the guide bar groove width (3).
The pitch is marked in inches on
the sprocket and guide bar (e.g. 3/8
or .325) and the groove width is
additionally marked on the bar in
millimeters (e.g. 1.6).
Do not run non-matching
components together (different
pitches or drive link gauges) since
they will otherwise be damaged
beyond repair within a very short
period of operation.
2
3
001BA105 KN
: Unscrew the nuts and remove the
chain sprocket cover.
2
: Turn screw (1) counterclockwise
until the tensioning nut (2) butts
against left end of housing slot.
106BA001 KN
3
3
4
: Fit the guide bar over the studs (3)
and engage the tensioning nut in the
hole (4).
Wear work gloves to protect your
hands from the sharp cutters.
1
106BA002 KN
106BA003 KN
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Page 19
English
Tensioning the Saw Chain
(Front chain tensioner)
5
: Fit chain around the sprocket (5)
and over the guide bar – cutting
edges on top of bar must point to
bar nose.
106BA025 KN
: Now turn tensioning screw (1)
clockwise until there is very little
chain sag on the underside of the
bar – and the drive link tangs are
located in the bar groove.
: Refit the sprocket cover and screw
on the nuts only fingertight at this
stage.
: Go to chapter “Tensioning the Saw
Chain”.
1
1
106BA004 KN
Retensioning during cutting work:
: Shut off the engine first –
and then loosen the nuts.
: Hold the bar nose up and use
screwdriver to turn tensioning screw
(1) clockwise until chain fits snugly
against the underside of the bar.
: While still holding the bar nose up,
tighten down the nuts firmly.
: Go to “Tensioning the Saw 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 "Operating Instructions".
143BA045 KN
18
070
Page 20
English
Checking Chain Tension
: Shut off the engine.
: Wear work gloves to protect your
hands.
: 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.
: 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”.
Fuel
Your engine requires a mixture of
gasoline and engine oil.
For health reasons, avoid direct skin
contact with gasoline and avoid inhaling
gasoline vapor.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. This ready-to-use fuel mix
contains no benzol or lead, has a high
octane rating and ensures that you
always use the right mix ratio.
STIHL MotoMix is specially
formulated for use in STlHL engines
and guarantees a long engine life.
108BA024 KN
MotoMix is not available in all markets.
Mixing Fuel
Unsuitable fuels or lubricants or mix
ratios other than those specified
may result in serious damage to the
engine. Poor quality gasoline or
engine oil may damage the engine,
sealing rings, hoses and the fuel
tank.
Gasoline
Use only high-quality brand-name
gasoline with a minimum octane rating
of 90 – leaded or unleaded.
If your machine is equipped with a
catalytic converter, you must use
unleaded gasoline.
A few tankfuls of leaded gasoline
will greatly reduce the efficiency of
the catalytic converter.
Engine Oil
Use only quality two-stroke engine oil.
We recommend STIHL two-stroke
engine oil since it is specially
formulated for use in STlHL engines
and guarantees a long engine life.
If STIHL two-stroke engine oil is not
available, use only quality two-stroke oil
designed for use in air cooled engines.
Do not use oils designed for water
cooled engines or engines with a
separate lubricating system (e.g.
conventional four-stroke engines).
Use only STIHL 50:1 two-stroke
engine oil for the fuel mix in models with
a catalytic converter.
19070
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English
Fueling
Mix Ratio
STIHL 50:1 two-stroke engine oil:
50 parts gasoline to 1 part oil
Other high-quality two-stroke engine
oils:
25 parts gasoline to 1 part oil
Examples
Gasoline
Liters Liters (cc) Liters (cc)
: Use a canister approved for storing
STIHL
engine oil
50:1
1 0.02 (20) 0.04 (40)
5 0.10 (100) 0.20 (200)
10 0.20 (200) 0.40 (400)
15 0.30 (300) 0.60 (600)
20 0.40 (400) 0.80 (800)
25 0.50 (500) 1.00 (1000)
fuel. Pour oil into the canister first,
then add gasoline and mix
thoroughly.
Other highquality twostroke engine
oils:
25:1
Storing Fuel
Store fuel only in approved safety-type
fuel canisters in a dry, cool and safe
location protected from light and the sun.
Fuel mix ages:
Only mix sufficient fuel for a few weeks
work. Do not store fuel mix for longer
than 3 months.
Exposure to light, the sun, low or high
temperatures can quickly make the fuel
mix unusable.
: Thoroughly shake the mixture in the
canister before fueling your
machine.
Pressure may build up in the
canister – open it carefully.
: Clean the fuel tank and canister
from time to time.
Dispose of remaining fuel and
cleaning fluid properly in
accordance with local regulations
and environment requirements.
106BA005 KN
: Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
: Position the machine so that the
filler cap is facing up.
Take care not to spill fuel while fueling
and do not overfill the tank.
After fueling, close the filler cap
carefully and tighten it as securely
as possible by hand.
20
070
Page 22
Chain Lubricant
English
Change the fuel pickup body
once every year
: Drain the fuel tank.
: Use a hook to pull the fuel pickup
body out of the tank and take it off
the hose.
: Push the new pickup body into the
hose.
: Place the pickup body in the tank.
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.
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, clutch 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
106BA006 KN
only a specially formulated chain
lubricant.
If special chain lubricant is not available,
you may - in an emergency - use an HD
single grade or multigrade engine oil
with a viscosity that suits the prevailing
outside temperature.
Do not use waste oil!
Medical studies have shown that
renewed contact with waste oil can
cause skin cancer. Moreover, waste
is environmentally harmfull!
Waste oil does not have the
necessary lubricating properties
and is unsuitable for chain
lubrication.
21070
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English
Filling Chain Oil Tank
OIL
: Thoroughly clean the oil filler cap
and the area round it to ensure that
no dirt falls into the tank.
: Remove the filler cap.
: Refill the chain oil tank every time
you refuel.
: Close the filler cap.
There must still be a small amount of oil
in the oil tank when the fuel tank is
empty.
If the oil level in the tank does not go
down, the reason may be a problem in
the oil supply system: Check chain
lubrication, clean the oilways, contact
your servicing dealer for assistance if
necessary. STIHL recommends that you
have maintenance and repair work
performed only by a STIHL servicing
dealer
106BA007 KN
: Check oil level at oil sight glass
before starting work and during
operation.
Checking Chain Lubrication
143BA024 KN
106BA024 KN
The saw chain must always throw off a
small amount of oil.
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
oil level in tank before starting work.
Every new chain has to be broken in for
about 2 to 3 minutes.
After breaking in chain, check chain
tension and adjust if necessary – see
“Checking Chain Tension”.
22
070
Page 24
Starting / Stopping the Engine
Choke
2
English
3
5
4
1
STOP
: Observe safety precautions.
: Move the stop switch (1) away from
“STOP“.
: If the engine is cold, set the choke
knob (2) to “Choke“ (pull it out).
If the engine is warm, move the
choke knob away from “Choke“
(push it in),
(also use this position if the engine
has been running but is still cold)
106BA008 KN
: Press down the trigger interlock (3)
and pull the throttle trigger (4) at the
same time – hold both levers in that
position.
: Press in the starting throttle lock
button (5) and hold it there.
: Let go of the throttle trigger, lock
button and trigger interlock lever in
that order. This is the starting
throttle position.
106BA009 KN
: Place your saw on the ground.
Make sure you have a firm footing –
check that chain is not touching any
object or the ground.
Bystanders must be well clear of the
general work area of the saw.
: Hold the saw firmly on the ground
with your left hand on the front
handle – your thumb should be
under the handle.
: Put your right foot into the rear
handle and press down.
106BA010 KN
23070
Page 25
English
At very low outside temperatures:
6
Allow engine to warm up
When the engine begins to fire:
6
: Move choke knob to half-way
(starting throttle) position and allow
engine to warm up for brief period.
: Move the choke knob away from
“Choke“ (push it in).
: Blip the throttle trigger to disengage
Choke
the starting throttle lock – it moves
to the normal run position and the
engine settles down to idling speed.
: Press down the decompression
valve (6) with your left thumb and
hold it there.
: Pull the starter grip slowly with your
right hand until you feel it engage –
and then give it a brisk strong pull.
Do not pull out the starter rope all
the way – it might otherwise break.
Do not let the starter grip snap back
– guide it slowly and vertically into
the housing so that the starter rope
can rewind properly.
24
2
106BA011 KN
5
When the engine begins to fire:
: Move the choke knob (2) away from
“Choke“ (push it in) and continue
cranking – release the
decompression valve (6) as soon
as engine runs.
: Blip the throttle trigger to disengage
the starting throttle lock (5) – it
moves to the normal run position
and the engine settles down to idling
speed.
: Observe safety precautions.
: Check operation of chain lubrication
before starting work.
STOP
To shut down the engine:
: Move the stop switch to “STOP“.
106BA012 KN
If the engine does not start:
If you did not move the choke knob away
from “Choke” quickly enough after the
engine began to fire, the combustion
chamber is flooded.
: Pull off the spark plug boot.
: Unscrew and dry off the spark plug.
: Move the stop switch to “STOP“.
: Pull the throttle trigger to open the
throttle wide.
: Crank the engine several times with
the starter to clear the combustion
chamber.
070
Page 26
Operating Instructions
English
: Install the spark plug and connect
the spark plug boot.
: Move the stop switch away from
“STOP“.
: Move the choke knob away from
“Choke“ (push it in) – even if the
engine is cold.
: Set the throttle trigger to the starting
throttle position.
: Now start the engine.
If the fuel tank has been run
completely dry and then refueled
: After refueling, pull the starter grip
several times until the system is
primed with fuel.
During break-in period
A factory new machine should not be run
at high revs (full throttle off load) for the
first three tank fillings. This avoid
unnecessary high loads during the
break-in period. As all the moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
Do not make the mixture leaner to
achieve an apparent increase in
power – this could damage the
engine – see “Adjusting the
Carburetor”.
During operation
Check chain tension frequently
A new chain has to be retension more
often than one that has been in use for
some time.
Chain cold:
Tension is correct when the chain fits
snugly against the underside of the bar
and can still be pulled along the bar by
hand.
Retension if necessary –
see “Tensioning the Saw Chain”.
Chain at operating temperature:
The chain stretches and begins to sag.
The drive links must not come out of the
bar groove – the chain may otherwise
jump off the bar.
Retension the chain – see “Tensioning
the Saw Chain”.
Always slacken off the chain after
finishing work. The chain contracts
as it cools down. If it is not loosened,
it may damage the crankshaft and
bearings.
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Page 27
English
Adjusting Oil Flow
After long period of full-throttle
operation
Allow engine to run for a short while at
idle speed so that the engine heat can
be dissipated by the flow of cooling air.
This protects engine-mounted
components (ignition, carburetor) from
thermal overload.
After finishing work
: Slacken off the chain if you have
retensioned it at operating
temperature during cutting work.
The chain contracts as it cools
down. If it is not loosened, it may
damage the crankshaft and
bearings.
Storing your saw for a short period:
Wait for engine to cool down. Fill the fuel
tank and keep the machine in a dry
place, well away from sources of
ignition, until you need it again.
Storing for a long period:
See chapter on “Storing the Machine”.
Different quantities of oil are required for
different bar lengths, types of wood and
cutting techniques.
: Pull the choke knob to close the
choke shutter.
: Remove the air filter cover and the
air filter.
1
2
: Use the adjusting screw (1) (on
back wall of oil tank) to vary the oil
feed rate as required.
: Use one 10 mm open-end wrench to
hold the adjusting screw (1i) steady
and another 10 mm open-end
wrench to loosen the locknut (2).
: To reduce oil feed – turn adjusting
screw clockwise.
: To increase oil feed – turn adjusting
screw counterclockwise.
A third of a turn changes the oil feed
rate to approximately what is
required for the next bar length.
: Tighten down the locknut (2).
: Fit the air filter and air filter cover.
Your chain must always be wetted
with a film of lubricant.
106BA013 KN
26
070
Page 28
Taking Care of Guide Bar
English
Manual pump
The manual pump provides additional
chain lubrication in special situations:
– Cutting for long periods with extra
long bars
– At low temperatures
– After long out-of-service period
– Before starting
This helps protect the cutting attachment
from excessive wear.
106BA014 KN
1
: Turn the bar over –
every time you sharpen the chain
and every time you replace the
chain – this helps avoid one-sided
wear, especially at the nose and
underside of the bar.
: Regularly clean
the oil inlet hole (1),
the oilway (2) and
the bar groove (3).
: Measure groove depth –
with scale on filing gauge* – in area
of bar where wear is greatest.
Chain
type
2
3
Rapid 3/8“; 0.325“* 6.0 mm
Rapid 0.404“ 7.0 mm
If the groove depth is less than specified:
: Replace the guide bar.
The drive link tangs will otherwise
scrape along the bottom of the groove –
the cutters and tie straps will not ride on
the bar rails.
* see “Guide to Using this Manual”
143BA026 KN
Pitch Minimum
groove
depth
* see “Guide to Using this Manual”
27070
Page 29
English
Cleaning the Air Filter
Choke
2
1
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
: Remove the filter.
: Knock out the filter on the palm of
your hand or blow it out with
compressed air, from the inside
outwards.
If the filter is caked with dirt:
: Wash the filter with STIHL universal
cleaner or in a clean, nonflammable solution (e.g. warm
soapy water) and then dry.
: Do not clean flocked air filters with
compressed air, a brush or a cloth.
: Always replace damaged filters.
: Reinstall the air filter.
: Fit the filter cover and secure it by
106BA015 KN
turning the twist lock clockwise.
: Move the choke knob away from
“Choke”.
Adjusting the Carburetor
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Standard setting
: Check the air filter and clean or
replace if necessary.
L
H
106BA016 KN
If there is a noticeable loss of engine
power:
: Move the choke knob (1) to
“Choke”.
: Release and remove the filter cover
by turning the twist lock (2) in
direction of arrow.
: Clean away loose dirt from around
the filter and inside the filter cover.
28
: Carefully screw the low speed and
high speed screws down onto their
seats (clockwise).
: Open the high speed screw (H) one
full turn.
: Open the low speed screw (L) one
full turn.
070
Page 30
English
Adjusting Idle Speed
L A
Engine stops while idling
: Carry out the standard setting.
: Turn the idle speed screw (LA)
slowly clockwise until the chain
begins to run – then turn the screw
back a 1/4 turn.
Chain runs when engine is idling
: Carry out the standard setting.
: Turn the idle speed screw (LA)
counterclockwise until the chain
stops running – then turn the screw
another 1/4 turn in the same
direction.
Erratic idling behavior, poor
acceleration
(even though L screw is open 1 turn)
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise (about
until the engine runs and
accelerates smoothly.
It is usually necessary to change the
106BA017 KN
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
1
/4 turn)
Fine tuning for operation at high
altitude
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
: Check the standard setting.
: Warm up the engine.
: Turn the high speed screw (H)
slightly clockwise (leaner) – no
further than stop.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
Turn the screws very slowly and
carefully – even slight corrections have a
noticeable effect on engine running
behavior.
If the chain continues moving when
the engine is idling, have your saw
checked and repaired by your
servicing dealer.
29070
Page 31
English
Checking the Spark Plug
: Rectify the problems which have
caused fouling of spark plug:
– To much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
: Fit a new spark plug after
about 100 operating hours – or
sooner if the electrodes are badly
eroded.
Install only suppressed spark plugs
of the type approved by STIHL –
see "Specifications".
To reduce the risk of arcing
and fire:
2
3
If engine is down on power, difficult to
start or runs poorly at idle speed, first
check the spark plug.
: Remove the spark plug –
see "Starting / Stopping the Engine".
: Clean dirty spark plug.
: Check electrode gap (A) and
readjust if necessary – see
"Specifications".
30
000BA002 KN
: If the spark plug comes with a
detachable adapter nut (1), screw it
on firmly.
000BA050 KN
1
000BA045 KN
On all spark plugs:
: Always press the boot (2) firmly on
to the spark plug (3).
070
Page 32
Replacing the Starter Rope and Rewind Spring
English
1
1
1
: Remove the screws (1).
: Take the fan housing of the
crankcase.
1
106BA018 KN
: Use screwdriver or suitable pliers to
carefully remove spring clip (1) from
the starter post.
: Carefully remove the rope rotor
with washer (2) and pawl (3) – do
not pull the rewind spring (under
rope rotor) out of the housing.
2
3
: Use a screwdriver to pry the rope
out of the starter grip.
1
: Remove the remaining rope from
the rotor and grip.
: Thread the new rope through the
top of the starter grip and rope
108BA013 AM
bushing and tie one of the special
knots shown.
: Pull the knot back into the grip.
213BA018 KN
31070
Page 33
English
: Pull the starter rope through the
rotor and secure it with a simple
overhand knot.
: Coat rope rotor bearing bore with
non-resinous oil.
: Slip the rotor over the starter post –
turn it back and forth to engage
anchor loop of rewind spring.
5
4
6
001BA004 K
: Refit the pawl (4) in the rotor.
: Fit the washer (5) on the starter
post.
: Use a screwdriver or suitable pliers
to install the spring clip (6) on the
starter post and engage it on the
pawl's peg – the spring clip must
point clockwise – see illustration.
Tensioning the rewind spring
: Make a loop in the unwound starter
rope and use it to turn the rope rotor
six full revolutions in the direction of
the arrow.
: Hold the rotor steady – pull out and
108BA015 AM
straighten the twisted rope.
: Release the rotor – let go of rope
slowly so that it winds onto the rotor.
The starter grip must locate firmly in the
rope guide bushing. If the grip droops to
one side: Add one more turn on rope
rotor to increase spring tension.
When starter rope is fully extended it
must still be possible to rotate the rotor
at least another half turn. If this is not the
case, the spring is overtensioned and
could break – take one turn of rope off
the rotor.
: Fit the fan housing on the
crankcase.
001BA101 KN
32
070
Page 34
Storing the Machine
English
Replacing a broken rewind spring
: Lubricate the new spring with a few
drops of resin-free oil. Do not open
the wire retainer!
: Remove the rope rope as described
under “Replacing the Starter Rope”.
: Remove the remaining parts of the
spring.
The remaining bits of spring might
still be under tension and could fly
apart when you take them out of the
housing. To reduce the risk of
injury, wear eye and face protection
and work gloves.
: Fit the rewind spring – engage outer
spring loop on lug – the wire retainer
slips off the spring in this process.
: Reinstall the rope rotor, tension the
rewind spring, fit the fan housing
and secure in position.
If the spring pops out and uncoils,
refit it in the clockwise direction,
working from the outside inwards.
001BA014 K
For periods of about 3 months or longer:
: Drain and clean the fuel tank in a
well ventilated area.
: Dispose of remaining fuel and
cleaning solution properly in
accordance with local
environmental requirements.
: Run engine until carburetor is dry,
this helps prevent the carburetor
diaphragms sticking together.
: Remove the saw chain and guide
bar, clean them and spray with
corrosion inhibiting oil.
: Thoroughly clean the unit,
pay special attention to the cylinder
fins and air filter.
: If you use a biological chain and bar
lubricant, e.g. STIHL BioPlus,
completely fill the chain oil tank.
: Store the unit in a dry and high or
locked location, out of the reach of
children and other unauthorized
persons.
33070
Page 35
English
Checking and Replacing Chain Sprocket
Replace the chain sprocket:
– after using two chains or sooner
– if the wear marks (arrow) on the
sprocket are deeper than approx.
0.5 mm since this would reduce the
life of the chain. Use a gauge
(special accessory) to check the
depth of the wear marks.
It is best to use two chains in
rotation with one sprocket.
Before removing the chain sprocket
: Remove the chain sprocket cover,
saw chain and guide bar.
: Pull off the spark plug boot.
: Use the combination wrench to
unscrew the spark plug.
43BA030 LÄ
: Screw the locking screw into the
cylinder as far as stop.
: Use the combination wrench to
loosen and remove the hex nut.
The hex nut and the clutch have lefthand threads – they must be
unscrewed clockwise
106BA021 KN
106BA019 KN
: Remove the front cover washer.
: Remove the clutch.
: Remove the rear washer, chain
sprocket and needle cage.
: Clean the crankshaft stub.
: Clean needle cage and lubricate it
with STIHL grease.
106BA020 KN
34
: Turn the crankshaft clockwise until it
is blocked.
070
Page 36
Note the following points when
installing:
: Fit needle cage and new chain
sprocket.
: Fit the rear washer – the collar faces
the sprocket.
: Push the clutch with adapter sleeve
and ring onto the crankshaft stub –
the ring faces outwards.
: Fit the front cover washer – the
raised center faces outwards.
: Fit the hex nut (counterclockwise)
and tighten it down firmly with the
combination wrench.
: Unscrew the locking screw from the
cylinder.
: Install the spark plug.
: Mount the bar, chain and sprocket.
English
35070
Page 37
English
Maintaining and Sharpening Saw Chain
Cutting effortlessly with correctly
sharpened chain
A properly sharpened chain slices
through wood effortlessly and requires
very little feed pressure.
Do not work with a dull or damaged
chain as it will increase the physical
effort required, cause high vibrations,
produce unsatisfactory cutting results
and a higher rate of wear.
: Clean the chain.
:
Check the chain
links and damaged rivets.
: Replace any damaged or worn parts
of the chain and match the new
parts to the shape and size of the
original parts.
It is absolutely essential to comply
with the angles and dimensions
specified below. If the saw chain is
incorrectly sharpened – and in
particular if the depth gauge is set
too low – there is a risk of increased
kickback of the chainsaw, with
resulting risk of injury.
for cracks in the
3/8
3
The chain pitch (e.g.
the depth gauge end of each cutter.
Use only special saw chain
sharpening files. Other files have the
wrong shape and cut.
Select file diameter according to chain
pitch – see table “Sharpening Tools”.
You must observe certain angles when
resharpening the chain cutter.
/8") is marked on
A
B
689BA020 KN
A = Filing angle
B = Side plate angle
Chain type Angle (°)
Rapid-Micro (RM) 30 85
Rapid-Super (RS) 30 60
Picco-Micro (PM/PMN) 30 85
Cutter shapes:
Micro = Semi-chisel
Super = Full chisel
The specified angles A and B are
obtained automatically if the
recommended files or sharpening tools
and correct settings are used.
689BA021 KN
AB
36
070
Page 38
English
Furthermore, the angles must be the
same on all cutters. If angles are
uneven: Chain will run roughly, not in a
straight line, wear quickly and finally
break.
As these requirements can be met only
after sufficient and constant practice:
: Use a file holder
A file holder (special accessory) must be
used for manual resharpening (see table
"Sharpening Tools"). The correct filing
angles are marked on the file holder.
For checking angles
90°
85°70°
80°
60°
35°
30°
0°
10°
Use a STlHL filing gauge (special
accessory – see table "Sharpening
689BA025 KN
Tools"). This is a universal tool for
checking the filing and side plate angles,
depth gauge setting and cutter length. It
also cleans the guide bar groove and oil
inlet holes.
File correctly
: Select sharpening tools according
to chain pitch.
: Clamp the bar in a vise if necessary.
: Sharpen chain frequently, take
away as little metal as possible –
two or three strokes of the file are
usually enough.
689BA022 KN
: Hold the file horizontally (at right
angle to side of guide bar) and file
according to the angles marked on
the file holder. Rest the file holder on
the top plate and depth gauge.
90°
689BA018 KN
689BA043 KN
37070
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: Always file from the inside to the
outside of the cutter.
: The file only sharpens on the
forward stroke –
lift the file off the cutter on the
backstroke.
: Avoid touching the tie straps and
drive links with the file.
: Rotate the file at regular intervals
while filing to avoid one-sided wear.
: Use a piece of hardwood to remove
burrs from cutting edge.
: Check angles with the filing gauge.
All cutters must be the same length.
If the cutters are not the same length,
they will have different heights. This
makes the chain run roughly and can
cause it to break.
: Find the shortest cutter and then file
all other cutters back to the same
length. This can be very time
consuming – it is best to have it
done in the workshop on an electric
grinder.
Depth gauge setting
a
The depth gauge determines the height
at which the cutter enters the wood and
thus the thickness of the chip removed.
Specified distance or setting between
depth gauge and cutting edge = a:
This setting may be increased by 0.2mm
(0.008") for cutting softwood in mild
weather season – no frost.
Chain pitch Depth gauge
setting “a“
Inch (mm) mm (inch)
1
/
4
3
/8 PMN (9.32) 0.45 (0.018)
3
/8 PM (9.32) 0.65 (0.026)
0.325 (8.25) 0.65 (0.026)
3
/
8
0.404 (10.26) 0.80 (0.031)
(6.35) 0.65 (0.026)
(9.32) 0.65 (0.026)
Lowering depth gauges
The depth gauge setting is reduced
when the chain is sharpened.
: Use a filing gauge to check the
setting every time you sharpen the
chain.
689BA023 KN
1
689BA047 KN
: Place a filing gauge (1) that
matches the chain pitch on the
chain – if the depth gauge projects
from the filing gauge, the depth
gauge has to be lowered.
38
689BA051 KN
: File down the depth gauge until it is
level with the filing gauge.
070
Page 40
: File the top of the depth gauge
parallel to the stamped service
marking (see arrow) – but do not
lower the highest point of the depth
gauge in this process.
The kickback tendency of the
chainsaw is increased if the depth
gauges are too low.
689BA044 KN
: Place filing gauge on the chain –
highest point of depth gauge must
be level with the filing gauge.
PM 1, RM2:
Rear hump of tie strap (with service
marking) is lowered along with the depth
gauge.
RSC3, RMC3, PMC3:
The upper part of the humped drive link
(with service marking) is lowered along
with the depth gauge.
The other parts of the triple-humped
tie strap and humped drive link must
not be filed since this may increase
689BA052 KN
the kickback tendency of the
chainsaw.
: After sharpening, clean the chain
thoroughly, remove filings or
grinding dust – lubricate the chain
thoroughly.
Before long out-of-service period, clean
the chain and store it in a
well-oiled condition.
English
Sharpening Tools (special accessories)
Chain pitch Round file Ø Round file File holder Filing gauge Flat file
1)
Sharpening kit
inch (mm) mm (inch) Part No. Part No. Part No. Part No. Part No.
1
/
4
3
/8 PMN (9.32) 4.0 (5/32) 5605 772 4006 5605 750 4327 0000 893 4000 0814 252 3356 5605 007 1026
3
/8 P (9.32) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027
0.325 (8.25) 4.8 (
3
/
8
(6.35) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027
3
/16) 5605 772 4806 5605 750 4328 1110 893 4000 0814 252 3356 5605 007 1028
(9.32) 5.2 (13/64) 5605 772 5206 5605 750 4329 1110 893 4000 0814 252 3356 5605 007 1029
0.404 (10.26) 5.5 (7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030
1) Use triangular file 0811 421 8971 for PM1 and RM2
2) consisting of file holder with round file, flat file and filing gauge
2)
39070
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Maintenance Chart
Please note that the following maintenance intervals apply for normal
operating conditions only. If your daily working time is longer than normal or
cutting 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.
Complete machine
Throttle trigger, trigger interlock, choke knob,
stop switch
Pickup body/filter in fuel tank
Fuel tank Clean
Chain oil tank Clean
Chain lubrication Check
Saw chain
Guide bar
Chain sprocket Check
Air filter
AV elements (rubber buffers, springs)
Cooling inlets Clean
Cylinder fins Clean
1)
STIHL recommends that this work
be done by a STIHL servicing dealer
Visual inspection (condition, leaks)
Clean
Check operation
Check
Clean, replace filter element
Replace
Inspect, also check sharpness
Check chain tension
Sharpen
Check (wear, damage)
Clean and turn over
Deburr
Replace
Clean
Replace
Inspect
Have replaced by servicing dealer
1)
before
starting work
after finishing
work or daily
after each
refueling stop
weekly
monthly
every 12 months
XX
X
XX
X
XX
XXX
X
X
X
XX
XX
X
X
X
XXX
XX
X
XX
if problem
if damaged
as required
X
X
XX
X
X
40
070
Page 42
Please note that the following maintenance intervals apply for normal
operating conditions only. If your daily working time is longer than normal or
cutting 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.
Carburetor
Spark plug
All accessible screws and nuts
(not adjusting screws)
Chain catcher
Safety label Replace
1)
STIHL recommends that this work
2)
Check idle adjustment – chain must not rotate
Readjust idle
Readjust electrode gap
Replace after about 100 operating hours
Retighten
Check
Replace
be done by a STIHL servicing dealer
2) Firmly tighten cylinder base screws
of professional saws (3.4 kW or
more) after 10 to 20 hours of
operation
before
starting work
after finishing
work or daily
after each
refueling stop
weekly
XX
X
English
monthly
every 12 months
if damaged
if problem
X
as required
X
X
X
X
41070
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Minimize Wear and Avoid Damage
Observing the instructions in this manual
helps reduce the risk of unnecessary
wear and damage to the power tool.
The power tool must be operated,
maintained and stored with the due care
and attention described in this owner’s
manual.
The user is responsible for all damage
caused by non-observance of the safety
precautions, operating and maintenance
instructions in this manual. This includes
in particular:
– Alterations or modifications to the
product not approved by STIHL.
– Using tools or accessories which
are neither approved nor suitable for
the product or are of a poor quality.
– Using the product for purposes for
which it was not designed.
– Using the product for sports or
competitive events.
– Consequential damage caused by
continuing to use the product with
defective components.
Maintenance Work
All the operations described in the
"Maintenance Chart" must be performed
on a regular basis. If these maintenance
operations cannot be performed by the
owner, they should be performed by a
servicing dealer.
STIHL recommends that you have
maintenance and repair work carried out
only by an authorized STIHL servicing
dealer. STIHL servicing dealers are able
to attend regular training courses and
receive technical information bulletins
on the latest engineering changes.
If these operations are not carried out as
specified, the user assumes
responsibility for any damage that may
occur. Among other things, this includes:
– Damage to the engine due to
neglect or deficient maintenance
(e.g. of air and fuel filters), incorrect
carburetor adjustment or
inadequate cleaning of cooling air
inlets (intake ports, cylinder fins).
– Corrosion and other consequential
damage resulting from improper
storage.
– Damage to the product resulting
from the use of poor quality
replacement parts.
Parts Subject to Wear and Tear
Some parts of the power tool are subject
to normal wear and tear even during
regular operation in accordance with
instructions and, depending on the type
and duration of use, have to be replaced
in good time.
Among other parts, this includes:
– Saw chain, guide bar
– Drive components (Clutch,
clutch drum, chain sprocket)
– Filters (air, oil, fuel)
–Starter mechanism
–Spark plug
– Components of anti-vibration
system
42
070
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Main Parts and Controls
1
5
4
7
15
16
14
English
1 Filter cover twist lock
2 Spark plug boot
2
3
6
9
8
11
12
13
10
17
18
19
21
23
24
22
20
25
#
3 Decompression valve
4 Stop switch
5 Manual chain lubrication pump
6 Oil filler cap
7 Oil sight glass
8 Clutch, chain sprocket
9 Chain sprocket cover
10 Bumper spike
11 Chain tensioner
12 Guide bar
13 Oilomatic saw chain
106BA022 KN
14 Muffler
15 Front hand guard
16 Front handle (handlebar)
17 Starter grip
18 Carburetor adjusting screws
19 Choke knob
20 Fuel filler cap
21 Starting throttle lock button
22 Throttle trigger
23 Throttle trigger interlock
24 Rear handle
25 Rear hand guard
# Serial number
106BA023 KN
43070
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English
Specifications
Engine
STIHL single cylinder two-stroke engine
Displacement
105.7 cm
Bore
58 mm (2.28 in)
Stroke
40 mm (1.57 in)
Engine power
to ISO 7293
4.8 kW at 7,000 rpm
Idle speed
2,000 rpm
Max. engine speed
(with bar and chain)
7,500 rpm
3
(6.47 cu. in)
Ignition System
Type
Flywheel magneto ignition system
Ignition timing
2,8 – 3,2 mm (0.110 – 0.126 in) vor OT
Breaker point gap
0.35 – 0.45 mm (0.013 – 0.018 in)
Spark plug(suppressed)
Bosch WSR 6 F
Electrode gap 0.5 mm
Spark plug thread M 14 x 1.25,
9.5 mm (0.37 in) long
Fuel System
Carburetor
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity: 1.2 l (40.6 fl.oz.)
Cutting Attachment
Guide bars
Duromatic, Rollomatic
Bar lengths
Duromatic 53, 63, 75, 80 and 90 cm
(20, 25, 30, 32 and 35 in)
Rollomatic 75 and 90 cm (30 and 35 in)
Oilomatic saw chain
10.26 mm (.404’’) pitch:
Rapid Standard, Rapid Micro,
Rapid Super.
Rapid Standard and Rapid Super also
available in S-type version
12.70 mm (1/2’’) pitch:
Rapid Standard
Chain sprockets
7-tooth for .404’’ pitch
6-tooth for 1/2’’ pitch
Chain lubrication
Fully automatic, speed controlled oil
pump with rotary piston. Additional
manual pump.
Oil tank capacity: 0.53 l (17.9 fl.oz.)
44
Weight (without bar and chain)
070: 10.7 kg (23.6 lbs)
070 AV: 12.2 kg (26.9 lbs)
070
Page 46
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Special Accessories Ordering Spare Parts Maintenance and Repairs
File holder with round file
Filing gauge
Reference gauges
STIHL lubricating grease
STIHL filler nozzle for STIHL
canisters
helps avoid spills and overfilling during
refueling.
Contact your STIHL dealer for more
information on these and other special
accessories.
Please enter your saw model, serial
number as well as the part numbers of
the guide bar and saw chain in the
spaces provided. This will make reordering simpler.
The guide bar and saw chain are subject
to normal wear and tear.
When purchasing these parts, always
quote the saw model, the part numbers
and names of the parts.
Model
Serial number
Guide bar part number
Chain part number
Users of this machine may only carry
out the maintenance and service work
described in this user manual.
All other repairs must be carried out
by a servicing dealer.
STIHL recommends that all
maintenance and repair work be carried
out by an authorized STIHL dealer.
STIHL dealers regularly attend training
courses and are supplied with the
necessary technical information.
When repairing the machine, only use
replacement parts which have been
approved by STIHL for this power tool
or are technically equivalent. Only use
high-quality replacement parts in order
to avoid the risk of accidents or damage
to the machine.
STIHL recommends the use of genuine
STIHL replacement parts.
Original STlHL parts can be identified by
the STIHL part number, the
logo and the STlHL parts symbol (.
The symbol may appear alone on small
parts.
STIHl
45070
Page 47
English
Quality Certification
All STIHL products comply with the
highest quality standards.
An independent organization has
certified that all products manufactured
by STIHL meet the strict requirements of
the ISO 9001 standard for quality
management systems in terms of
product development, materials
purchasing, production, assembly,
documentation and customer service.
000BA026
46
070
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English
47070
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English
48
070
Page 50
0458 106 0121
englisch / English
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