STIHL MS 170, 180 Instruction Manual
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STIHL MS 170, 180 Instruction Manual
English
Contents
Guide to Using this Manual 2 Checking and Replacing the Chain Dear Customer,
Safety Precautions 3 Sprocket 36 Thank you for choosing a quality
Reactive Forces 8 Maintaining and Sharpening the engineered STIHL product.
Saw Chain 36
Original Instruction Manual
Working Techniques 9 It has been built using modern
Maintenance and Care 40 production techniques and
Cutting Attachment 18
Minimize Wear and Avoid Damage 42 comprehensive quality assurance.
Mounting the Bar and Chain (front
Main Parts 43 Every effort has been made to ensure
chain tensioner) 18
your satisfaction and trouble-free use of
Mounting the Bar and Chain (quick Specifications 44
the product.
chain tensioner) 19 Ordering Spare Parts 46
Please contact your dealer or our sales
Mounting the Bar and Chain (side Maintenance and Repairs 46
company if you have any queries
chain tensioner) 21 Disposal 46
Printing inks contain vegetable oils, paper can be recycled.
concerning this product.
Tensioning the Saw Chain (front EC Declaration of Conformity 47
chain tensioner) 22 Your
Tensioning the Saw Chain (quick
chain tensioner) 23
Tensioning the Saw Chain (side
chain tensioner) 23
Printed on chlorine-free paper
Checking Chain Tension 23 Dr. Nikolas Stihl
Fuel 24
Fueling 25
Chain Lubricant 25
Filling Chain Oil Tank 26
Checking Chain Lubrication 26
Chain Brake 27
Starting / Stopping the Engine 28
Operating Instructions 31
Taking Care of the Guide Bar 32
© ANDREAS STIHL AG & Co. KG, 2020
Shroud 33
Cleaning the Air Filter 33
0458-206-0121-B. VB5.J20.
Adjusting the Carburetor 34
0000006734_012_GB
Spark Plug 34
Storing the Machine 35
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
MS 170, MS 170 C, MS 180, MS 180 C 1English
Intake air baffle: winter Engineering improvements
Guide to Using this Manual operation
STIHL's philosophy is to continually
This Instruction Manual refers to a improve all of its products. For this
Intake air baffle: summer
STIHL chain saw, also called a machine reason we may modify the design,
operation
in this Instruction Manual. engineering and appearance of our
products periodically.
Pictograms Handle heating Therefore, some changes, modifications
and improvements may not be covered
Pictograms that appear on the machine in this manual.
are explained in this Instruction Manual.
Actuate decompression
Depending on the machine and valve
equipment version, the following
pictograms may appear on the machine.
Fuel tank; fuel mixture of Actuate manual fuel
gasoline and engine oil pump
Tank for chain oil; chain
oil
Symbols in text
Engage and release
chain brake
WARNING
Warning where there is a risk of an
Coasting brake accident or personal injury or serious
damage to property.
Direction of chain travel NOTICE
Caution where there is a risk of
damaging the machine or its individual
components.
Ematic; chain oil flow
adjustment
Tension saw chain
2 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Do not lend or rent your chain saw Clothing and Equipment
Safety Precautions without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual. Wear proper protective clothing and
Special safety precau- equipment.
tions must be observed to To operate a chain saw you must be
reduce the risk of per- rested, in good physical condition and Clothing must be sturdy
sonal injury when mental health. If you have any condition and snug-fitting, but allow
working with a chain saw that might be aggravated by strenuous complete freedom of
because of the very high work, check with your doctor before movement. Wear snug
chain speed and very operating a chain saw. fitting clothing with cut-
sharp cutters. retardant pads – no
Do not operate the chain saw if you are loose-fitting jacket.
It is important that you under the influence of any substance
(drugs, alcohol) which might impair Avoid clothing that could get caught on
read the instruction man-
vision, dexterity or judgment. branches, brush or moving parts of the
ual before first use and
machine. Do not wear a scarf, necktie or
keep it in a safe place for To reduce the risk of accidents or injury, jewellery. Tie up and confine long hair
future reference. Non- put off the work in poor weather (headscarf, cap, hard hat, etc.).
observance of the conditions (rain, snow, ice, wind).
instruction manual may Wear suitable safety
result in serious or even Persons with pacemakers only: The shoes – with cut-retard-
fatal injury. ignition system of your chain saw ant material, non-slip
produces an electromagnetic field of a soles and steel toe caps.
General very low intensity. This field may
interfere with some pacemakers. To
reduce health risks, STIHL recommends
Observe all applicable local safety that persons with pacemakers consult WARNING
regulations, standards and ordinances. their physician and the pacemaker To reduce the risk of eye
The use of noise emitting power tools manufacturer before operating this injuries, wear tight-fitting
may be restricted to certain times by power tool. safety goggles conform-
national or local regulations. ing to standard EN 166 or
Intended use a face shield. Make sure
If you have not used this model before:
that the safety goggles
Have your dealer or other experienced
The machine may only be used to saw and the face shield fit
user show you how to operate your
wood and wooden objects. correctly.
machine or attend a special course in its
operation. Do not use the machine for any other Wear "personal" hearing protection – for
Minors should never be allowed to use a purpose – risk of accidents! example, ear defenders.
chain saw. Do not modify the machine in any way – Wear a hard hat wherever there is any
Keep bystanders, especially children, this may increase the risk of personal risk of falling objects.
and animals away from the work area. injury. STIHL excludes all liability for
personal injury and damage to property
The user is responsible for avoiding
caused while using unauthorised
injury to third parties or damage to their
attachments.
property.
MS 170, MS 170 C, MS 180, MS 180 C 3English
Wear sturdy protective Clean the dust and dirt off the machine – Open the fuel filler cap carefully so that
gloves made of a resist- do not use any grease solvents for this any excess pressure is relieved
ant material (e.g. purpose. gradually and fuel does not splash out.
leather). Clean the ventilation slots if necessary. The machine may only be refuelled in a
well ventilated place. Clean the machine
Do not use a high-pressure cleaner to
STIHL can supply a comprehensive immediately if fuel is spilled. Do not spill
clean the machine. The hard jet of water
range of personal protective equipment. fuel over your clothing – contaminated
can damage parts of the machine.
clothing must be changed immediately.
Transport Accessories The machines can be equipped with the
following filler caps as standard:
Before any transport – even over short Only use those tools, guide bars, chains, Screw-type tank cap
distances – switch off the machine, chain sprockets, accessories or
engage the chain brake and attach the After fueling, tighten
technically equivalent components that down the screw-type fuel
chain scabbard. This avoids the risk of have been approved by STIHL for this
the saw chain starting unintentionally. cap as securely as
machine. If you have any questions in possible.
this respect, consult a servicing dealer.
Use only high quality tools and
accessories. Otherwise, there may be a This reduces the risk of unit vibrations
risk of accidents and damage to the causing the fuel cap to loosen or come
machine. off and spill quantities of fuel.
STIHL recommends the use of genuine Check for leakage. To
001BA115 KN
STIHL tools, guide bars, chains, chain reduce the risk of serious
sprockets and accessories. They are of fatal burn injuries, do
specifically designed to match your not start or run the engine
Always carry the chain saw by the model and meet your performance until leak is fixed.
handle – with the hot muffler away from requirements.
your body, the guide bar must point to Before Starting Work
the rear. Avoid touching hot parts of the Refuelling
machine, especially the surface of the Check that your saw is properly
muffler – risk of burns! assembled and in good condition – refer
Gasoline is an extremely
In vehicles: Properly secure the machine flammable fuel – keep to appropriate chapters in the instruction
to prevent tipping, damage and chain oil clear of naked flames and manual.
or fuel spillage. fire – do not spill any fuel – Check the fuel system for leaks,
– no smoking. paying special attention to visible
Cleaning parts such as the tank cap, hose
Switch off the engine before refuelling.
connections and the manual fuel
Never refuel the machine while the pump (on machines so equipped). If
Clean plastic parts with a cloth. Harsh engine is still hot – the fuel may spill over
detergents can damage the plastic. – risk of fire!
4 MS 170, MS 170 C, MS 180, MS 180 CEnglish
there are any leaks or damage, do Your chain saw is a one-person saw. Do Never let the machine run unattended.
not start the engine – risk of fire. not allow other persons to be in the
Exercise caution with slippery surfaces,
Have your saw repaired by a working area – not even while starting.
water, snow, ice, steep slopes, uneven
servicing dealer before using it
Do not start the chain saw if the chain is ground or green wood that has just been
again.
in a cut. stripped of its bark – danger of slipping!
– Check operation of chain brake,
Move at least 3 meters away from the Use caution with tree stumps, roots,
front hand guard
place where the machine was refuelled ditches – danger of stumbling!
– Correctly mounted guide bar and never start the motor in enclosed
Do not work alone – keep within calling
spaces.
– Correctly tensioned chain distance of others who are trained in
Lock the chain with the chain brake emergency procedures and can provide
– The trigger and trigger lockout must
before starting – risk of injury due to help in an emergency. Helpers at the
move freely and spring back to the
rotating chain! cutting site must also wear protective
idle position when they are
clothing (helmet!) and stand well clear of
released. Do not drop-start the engine – start as
the branches being cut.
described in the Instruction Manual.
– Master Control lever must move
More care and attention than usual are
easily to STOP, 0 or †
During operation required when wearing ear protection,
– Check that the spark plug boot is as warning sounds (shouts, beeps, etc.)
secure – a loose boot may cause cannot be heard properly.
arcing that could ignite combustible Ensure you always have a firm and safe
footing. Take special care when the bark Take a break in good time to avoid
fumes and cause a fire.
is wet – danger of slipping! tiredness or exhaustion – risk of
– Never attempt to modify the controls accidents!
or safety devices in any way.
Dust (e. g., sawdust), fumes and smoke
– Keep the handles dry and clean – produced while using the machine may
free from oil and dirt – for safe be hazardous to health. If dust is
control of the saw. generated, wear a dust mask.
– Make sure there is sufficient fuel When the engine is running: Note that
001BA087 LÄ
and chain oil in the tanks. the saw chain continues to rotate for a
To reduce the risk of personal injury, do short period after you let go of the
not operate your saw if it is damaged or throttle trigger – coasting effect.
not properly assembled. Always hold the chain saw firmly with No smoking when working with or near
both hands: Right hand on the rear the chain saw - risk of fire! Combustible
Starting the chain saw handle – even if you are left-handed. To fuel vapour may escape from the fuel
ensure reliable control, wrap your system.
thumbs tightly around the handlebar and
Always work on a level surface. Ensure handle.
a firm and secure footing. Hold the
machine securely – the chain must not In the event of impending danger or in
touch any objects or the floor – danger of an emergency, switch off the engine
injury due to the rotating saw chain. immediately by moving the Master
Control lever / stop switch to STOP, 0 or
†.
MS 170, MS 170 C, MS 180, MS 180 C 5English
Examine the saw chain periodically at a machine that is not in perfect working Storage
short intervals and as soon as you note order. In case of doubt, have the unit
any tangible changes: checked by your servicing dealer.
When the machine is not in use, it
– Switch off the engine; wait until the Check for correct idling, so that the saw should be stored in such a way that no-
saw chain is stationary chain stops moving when the throttle one is endangered. Secure the machine
trigger is released. Check the idle setting against unauthorised use.
– Check condition and secure fitting
regularly and correct when possible.
– Check sharpness Have the machine repaired by a STIHL Store the machine in a safe, dry room.
Never touch the saw chain when the servicing dealer if the saw chain still
continues to move during idling. Vibrations
engine is running. If the saw chain
becomes jammed by an object, switch The chain saw produces
off the engine immediately before poisonous exhaust gases Prolonged use of the power tool may
attempting to remove the object – risk of as soon as the engine result in vibration-induced circulation
injury! starts. These gases may problems in the hands (whitefinger
be colourless and odour- disease).
Always turn off the engine before leaving
the machine unattended. less and may contain No general recommendation can be
unburnt hydrocarbons given for the length of usage because it
To change the saw chain, switch off the and benzene. Never work depends on several factors.
engine. Risk of injury from the motor with the machine indoors
starting unintentionally! or in poorly ventilated The period of usage is prolonged by:
Keep easily combustible materials areas, even if your – Hand protection (wearing warm
(e. g., wood chips, bark, dry grass, fuel) machine is equipped with gloves)
away from hot exhaust gases and hot a catalytic converter.
– Work breaks
mufflers – risk of fire! Mufflers with Ensure proper ventilation when working
catalytic converters can become in trenches, hollows or other confined The period of usage is shortened by:
especially hot. locations – risk of fatal injury from – Any personal tendency to suffer
Never work without chain lubrication – breathing toxic fumes! from poor circulation (symptoms:
monitor the oil level in the oil tank. Stop If you feel sick, have a headache, vision frequently cold fingers, tingling
work immediately if the oil level in the oil problems (e. g., your field of vision gets sensations).
tank is too low and top up with chain oil smaller), hearing problems, dizziness or – Low outside temperatures.
– see also "Topping up with chain oil" inability to concentrate, stop work
and "Check chain lubrication". – The force with which the handles
immediately. Such symptoms may be
are held (a tight grip restricts
If the machine is subjected to unusually caused by an excessively high
circulation).
high loads for which it was not designed concentration of exhaust emissions –
(e. g., heavy impact or a fall), always risk of accident! Continual and regular users should
check that it is in good condition before monitor closely the condition of their
continuing work – see also "Before After finishing work hands and fingers. If any of the above
starting work". symptoms appear (e.g. tingling
sensation in fingers), seek medical
Check the fuel system for leaks and Switch off the motor, engage the chain advice.
make sure the safety devices are brake and attach the chain scabbard.
working properly. Never continue using
6 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Maintenance and repairs Check ignition lead (insulation in good servicing dealer – do not use the
condition, secure connection). machine until the malfunction has been
remedied, see "Chain brake".
Always switch off the engine before any Check that the muffler is in perfect
repair, cleaning or maintenance work working condition.
and any work on the chain. Risk of injury Do not use the machine if the muffler is
if the engine starts inadvertently! damaged or missing – risk of fire,
Exception: adjustment of carburettor damage to hearing!
and idle speed. Never touch a hot muffler – risk of burns!
The machine must be serviced regularly. The condition of the anti-vibration
Do not attempt any maintenance or elements influences vibration behaviour
repair work not described in the – inspect anti-vibration elements
Instruction Manual. All other work should periodically.
be carried out by a servicing dealer.
Inspect chain catcher – replace if
STIHL recommends that maintenance damaged.
and repair work be carried out only by
authorised STIHL dealers. STIHL Switch off the engine
dealers receive regular training and are – To check the chain tension
supplied with technical information.
– To retension the chain
Use only high-quality spare parts.
Otherwise, there may be a risk of – To replace the chain
accidents and damage to the machine. If – For remedying malfunctions
you have any questions in this respect,
consult a servicing dealer. Observe sharpening instructions – for
safe and proper handling, always keep
Do not modify the machine in any way – the chain and guide bar in flawless
this may increase the risk of personal condition. Keep the chain properly
injury –risk of accidents! sharpened, tensioned and well
To reduce the risk of fire due to ignition lubricated.
outside the cylinder, move the master Change chain, guide bar and chain
control level to STOP, 0 or † before sprocket in due time.
turning the engine over on the starter
when the spark plug boot is removed or Regularly check that the clutch drum is
the spark plug is unscrewed! in perfect working condition.
Do not service or store the machine near Always store fuel and chain lubricant
a naked flame – risk of fire due to the only in the specified type of containers
fuel. and ensure they are correctly labelled.
Store in a dry, cool and secure place
Check fuel cap regularly for tightness. protected against light and sunlight.
Use only spark plugs that are in perfect In the event of a chain brake
condition and have been approved by malfunction, switch off the machine
STIHL – see "Specifications". immediately – risk of injury! Consult a
MS 170, MS 170 C, MS 180, MS 180 C 7English
Kickback occurs if, for example, – Be especially careful with small,
Reactive Forces tough limbs, undergrowth and
offshoots – the saw chain may
The most common reactive forces are: become caught in them
kickback, pushback and pull-in. – Never cut several limbs at once
– Do not lean too far forward
Dangers of kickback
– Do not cut above shoulder height
001BA257 KN
Kickback can result in – Use extreme caution when re-
fatal cuts. entering a previous cut
– Do not attempt plunge cuts if you
– The saw chain in the area of the are not experienced in this cutting
upper quarter of the guide bar nose technique
unintentionally comes into contact
with wood or a solid object – e. g., – Be alert for shifting of the log or
unintentionally touches another limb other forces that may cause the cut
during limbing to close and pinch the chain
– The saw chain at the nose of the – Always cut with a correctly
guide bar is briefly pinched in the cut sharpened, properly tensioned saw
chain – the depth gauge setting
must not be too large
QuickStop chain brake:
– Use low-kickback saw chains as
well as narrow-radius guide bars
This device reduces the risk of injury in
certain situations – it cannot prevent
Pull-in (A)
kickback. If activated, the brake stops
the saw chain within a fraction of a
second –
refer to chapter "Chain brake" in this
Instruction Manual.
001BA036 KN
Reducing the risk of kickback
001BA037 KN
Kickback occurs when the saw is
suddenly thrown up and back in an – Work cautiously and methodically
uncontrolled arc towards the operator. – Hold the chain saw firmly with both
A
hands and maintain a secure grip
When the chain on the bottom of the bar
– Always cut at full throttle – overbucking – is suddenly pinched,
caught or encounters a foreign object in
– Be aware of the location of the guide
the wood, the chain saw may suddenly
bar nose
– Do not cut with the guide bar nose
8 MS 170, MS 170 C, MS 180, MS 180 CEnglish
be drawn forward toward the log – to Dead wood (brittle, rotten or dead wood)
avoid this, engage the bumper spike poses a significant, highly unpredictable Working Techniques
firmly in the wood. hazard. It is extremely difficult or even
practically impossible to recognise the Sawing and felling work, including all
Pushback (B) danger. Use aids such as winches or related work (plunge cutting, limbing,
draglines. etc.) may only be carried out by persons
When felling close to roads, rail lines, who have been specially trained and
power lines, etc., work with particular instructed. Persons who are not
care. If necessary, notify police, power experienced chain saw users should not
companies or railway authorities. carry out any such work – increased risk
of accidents!
Country-specific legislation on felling
001BA038 KN
technique must be complied with during
B felling work.
When the chain on the top of the bar – Cutting
underbucking – is suddenly pinched,
caught or encounters a foreign object in Do not operate your saw with the
the wood, the chain saw may suddenly starting throttle lock engaged. Engine
be driven straight back toward the speed cannot be controlled with the
operator – to avoid this: throttle trigger in this position.
– Do not allow the top of the guide bar Work calmly and carefully – in daylight
to become jammed conditions and only when visibility is
– Do not twist the guide bar in the cut good. Ensure you do not endanger
others – stay alert at all times.
Be very careful First-time users are advised to practice
cutting logs on a sawhorse – see "When
– With freely hanging limbs cutting small logs".
– With trunks that are under tension Use the shortest possible guide bar: The
between other trees because they chain, guide bar and chain sprocket
fell unfavourably must match each other and your saw.
– When working in windbreaks
In these cases, do not use a chain saw –
use a hoist, winch or dragline instead.
Pull out trunks that are lying about and
have been cut free. Whenever possible,
deal with them in open areas.
MS 170, MS 170 C, MS 180, MS 180 C 9English
materials, dry plants or scrub. Always Note when reaching the end of a cut that
contact your local forest authority for the saw is no longer supported in the
information on a possible fire risk. kerf. You have to take the full weight of
the machine since it might otherwise go
out of control.
When cutting small logs:
001BA082 KN
– Use a sturdy and stable support –
sawhorse.
Position the saw so that your body is – Never hold the log with your leg or
clear of the cutting attachment. foot.
Always pull the saw out of the cut with – Never allow another person to hold
the chain running. the log or help in any other way.
Use your chain saw for cutting only. It is Limbing:
not designed for prying or shoveling – Use a low kickback chain.
away limbs, roots or other objects.
– Work with the saw supported
Do not underbuck freely hanging limbs. wherever possible.
001BA033 KN
Take care when cutting scrub and young – Do not stand on the log while
trees. The saw chain may catch and limbing it.
throw thin shoots in your direction.
– Do not cut with the bar nose.
To reduce the risk of injury, take special If on a slope, stand on the uphill side of
care when cutting shattered wood the log. Watch out for rolling logs. – Watch for limbs which are under
because of the risk of injury from slivers tension.
being caught and thrown in your When working at heights:
– Never cut several limbs at once.
direction. – Always use a lift bucket
Lying or standing logs under tension:
Make sure your saw does not touch any – Never work on a ladder or in a tree
foreign materials: Stones, nails, etc. may Always make cuts in the correct
be flung off and damage the saw chain. – Never work on an insecure support sequence (first at the compression
The saw may kick back unexpectedly – – Do not work above shoulder height side (1), then at the tension side (2), the
risk of accidents. saw may otherwise pinch or kick back –
– Never operate your power tool with risk of injury.
If the rotating chain makes contact with one hand
a rock or other solid object there is a risk
Begin cutting with the saw at full throttle
of sparking which may cause easily
and engage the spiked bumper firmly in
combustible material to catch fire under
the wood, and then continue cutting.
certain circumstances. Dry plants and
scrub are also easily combustible, Never work without the spiked bumper
especially in hot and dry weather because the saw may pull you forwards
conditions. If there is a risk of fire, do not and off balance. Always engage the
use your chainsaw near combustible spiked bumper securely in the tree or
limb.
10 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Ripping cut:
1
001BA088 LÄ
2
001BA151 KN
1 1/ 2 1
21/2
Maintain a distance of at least 2 1/2 tree
lengths from the next felling site.
2 Determining direction of fall and escape
path
1 Select gap in stand into which you want
001BA152 KN
the tree to fall.
Pay special attention to the following
001BA189 KN
points:
N Make relieving cut at the – The natural inclination of the tree
compression side (1)
Cutting technique in which the spiked – Unusually heavy limb structure,
N Make bucking cut at the tension asymmetrical growth, damage to
side (2) bumper is not used – risk of pull-in – start
the cut with the guide bar at the tree
Be wary of pushback when making shallowest possible angle – take extra – The wind direction and speed – do
bucking cut from the bottom upwards care since there is an increased danger not fell in high winds
(underbuck). of kickback.
– Direction of slope
NOTICE Preparing for felling – Neighboring trees
Do not cut a lying log at a point where it – Snow load
is touching the ground because the saw Check that there are no other persons in – Take the general condition of the
chain will otherwise be damaged. the felling area – other than helpers. tree into account – be especially
Make sure no-one is endangered by the careful with trunk damage or
falling tree – the noise of your engine deadwood (brittle, rotten or dead
may drown any warning calls. wood)
MS 170, MS 170 C, MS 180, MS 180 C 11English
Preparing work area at base of tree Felling notch
– First clear the tree base and work
B
area from interfering limbs and Preparing the felling notch
brush to provide a secure footing.
– Carefully clear the base of the trunk
(e.g., with an axe) – sand, stones
45° and other foreign objects will blunt
the saw chain
A C
45°
001BA146 KN
001BA040 KN
B
C
– Remove largest buttresses: first the
A Direction of fall
001BA271 KN
largest buttress – saw first vertically,
B Escape path (escape routes) then horizontally – only if the tree is
– Establish escape paths for each in sound condition
worker – approx. 45° diagonally
The felling notch (C) determines the
opposite to the direction of fall
direction of fall.
– Clear escape paths, eliminate
Important:
obstacles
– Make a felling notch at right angle to
– Put down tools and equipment at a
direction of fall
safe distance – but not on the
escape paths – Saw as close to the ground as
possible
– When felling, stand only to the side
of the falling trunk and only move – Cut to a depth of approx. 1/5 to 1/3
back laterally onto the escape path of the diameter of the trunk
– 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.
12 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Determine direction of fall with gunning Checking the direction of fall felling notch to a depth of about 1/10 of
sight on cover and fan housing trunk diameter. On large diameter trees,
cut to no more than width of guide bar.
Do not make sapwood cuts if wood is
diseased.
Basic information on felling cut
001BA153 KN
001BA153 KN
Basic dimensions
N Insert the chainsaw with guide bar in
Your chainsaw has a gunning sight on the bottom of the felling notch. The
the cover and fan housing. Use this gunning sight must point in the
gunning sight. planned direction of fall – if
necessary, correct direction of fall
Making the felling notch C
by re-cutting the felling notch. 1/10
When making a felling notch, align the Ø
chainsaw so that the notch lies at a right Sapwood cuts
angle to the direction 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
C E
national legislation regarding felling
technique.
001BA259 KN
N Make a bottom (horizontal) cut G
N Make the top (angled) cut
approx. 45°- 60° to the bottom cut
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 diameter
001BA150 KN
– Never saw through the hinge while
felling – otherwise the tree will fall in
a direction other than the one
Sapwood cuts in long-fibered softwood planned – risk of accident!
help prevent sapwood splintering when
the tree falls. Make cuts at both sides of – With rotten trunks, leave a wider
the trunk at same height as bottom of hinge
MS 170, MS 170 C, MS 180, MS 180 C 13English
The tree is felled with the felling cut (E). 1. Begin cut by applying the lower Select suitable felling wedges
portion of the guide bar nose – do dependent on the trunk diameter and the
– Cut horizontally
not use upper portion because of width of the kerf (analogue to felling cut
– 1/10 (at least 3 cm) of tree diameter risk of kickback. Cut at full strength (E)).
higher than bottom of felling until the depth of the kerf is twice the
Contact the STIHL dealer for the
notch (C). width of the guide bar
selection of the felling wedge (suitable
The holding strap (F) or stabilizing 2. Swing the machine slowly into the length, width and height).
strap (G) supports the tree and helps plunge cutting position – risk of
prevent it from falling prematurely. kickback and pushback! Selecting the appropriate felling cut
– Width of strip: approx. 1/10 to 1/5 of 3. Make the plunge cut very carefully.
the trunk diameter Risk of pushback. The selection of the appropriate felling
– Do not cut into the strip during the cut is dependent on the same tree
felling cut characteristics that must be noted when
determining the direction of fall and the
– With rotten trunks, leave a wider escape paths.
strip
There are various different features of
Plunge cutting these characteristics. This User Manual
001BA270 KN
– For relieving cuts during shortening will only describe the two most
commonly occurring variants:
– For wood carving
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,
001BA260 KN
i.e. the same thickness at all points. To
do this, guide the plunge bar parallel to
the sink chord.
Felling wedges left: Normal tree – vertically
upright tree with uniform
Insert the felling wedge as soon as
1. crown
possible, i.e. as soon as no obstruction
of saw control is to be expected. Position right: Leaner tree - crown pointing in
the felling wedge in the felling cut and direction of fall
3.
drive in with suitable tools.
2.
001BA269 KN
Only use aluminum or plastic wedges –
do not use steel wedges. Steel wedges
can seriously damage the saw chain and
N Use a low kickback saw chain and cause dangerous kickback.
proceed with special care
14 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Felling cut with stabilizing strap (normal – Do not cut into the stabilizing strap
tree)
A) Thin trunks 1.
2.
Implement this felling cut when the trunk 3.
diameter is smaller than the cutting
length of the chainsaw.
3.
4. 5.
001BA263 KN
1.
2.
001BA273 KN
Shout a warning before starting the
felling cut.
N Set the felling wedge (3)
N Engage the spiked bumper at the
Shout a second warning immediately
height of the felling cut and use this
before the tree falls.
as the rotation point – reposition the
001BA261 KN
N Cut through the stabilizing strap, chainsaw as little as possible
horizontal level with the felling cut,
N Tip of the guide bar must penetrate
with arms fully extended
the wood before the hinge (1) –
Shout a warning before starting the B) Thick trunks guide the chainsaw absolutely
felling cut. horizontally and swivel as widely as
Implement this felling cut when the trunk
N Plunge cut the felling cut (E) – diameter is greater than the cutting possible
plunge the guide bar fully in length of the machine. N Make the felling cut up to the
N Engage the spiked bumper behind hinge (2)
the hinge and use this as the – Do not cut into the hinge
rotation point – reposition the
chainsaw as little as possible N Make the felling cut up to the
stabilizing strap (3)
N Make the felling cut up to the
hinge (1) – Do not cut into the stabilizing strap
– Do not cut into the hinge The felling cut must be continued on the
opposite side of the trunk.
N Make the felling cut up to the
stabilizing strap (2) Ensure that the second cut is at the
same level as the first cut.
MS 170, MS 170 C, MS 180, MS 180 C 15English
N Plunge cut the felling cut
N Make the felling cut up to the
hinge (4)
– Do not cut into the hinge
N Make the felling cut up to the
stabilizing strap (5) 1. 2.
– Do not cut into the stabilizing strap
001BA266 KN
001BA265 KN
6.
N Plunge cut the guide bar into the Shout a second warning immediately
trunk until it exits on the other side before the tree falls.
N Make the felling cut (E) towards the N With outstretched arms, cut through
hinge (1) the holding strap at a downward
angle from outside.
– Cut horizontally
001BA274 KN
– Do not cut into the hinge
N Make the felling cut towards the
N Set the felling wedge (6) holding strap (2)
Shout a second warning immediately – Cut horizontally
before the tree falls. – Do not cut into the holding strap.
N Cut through the stabilizing strap,
horizontal level with the felling cut,
with arms fully extended
Felling Cut with Holding Strap (Leaner)
A) Thin trunks
Implement this felling cut when the trunk
diameter is smaller than the cutting
length of the chainsaw.
16 MS 170, MS 170 C, MS 180, MS 180 CEnglish
B) Thick trunks The felling cut must be continued on the N With outstretched arms, cut through
opposite side of the trunk. the holding strap at a downward
angle from outside.
Ensure that the second cut is at the
same level as the first cut.
1. N Engage the spiked bumper behind
2. 3. the hinge and use this as the
rotation point – reposition the
chainsaw as little as possible
N Tip of the guide bar must penetrate
the wood before the holding strap
(4) – guide the chainsaw absolutely
horizontally and swivel as widely as
possible
5. 6. N Make the felling cut up to the
4.
hinge (5)
001BA267 KN
– Do not cut into the hinge
N Make the felling cut up to the
holding strap (6)
Perform this felling cut when the tree – Do not cut into the holding strap.
diameter is greater than the cutting
length of the chainsaw.
N Engage the spiked bumper behind
the holding strap and use it as a
pivot – avoid repositioning the
chainsaw more than necessary.
N The guide bar nose enters the
wood (1) before it reaches the hinge
– hold the chainsaw horizontally and
swing it as far as possible.
– Do not cut into the holding strap or
hinge.
N Make the felling cut up to the
hinge (2)
– Do not cut into the hinge
001BA268 KN
N Make the felling cut up to the
holding strap (3)
– Do not cut into the holding strap. Shout a second warning immediately
before the tree falls.
MS 170, MS 170 C, MS 180, MS 180 C 17English
Chain Scabbard
Cutting Attachment Mounting the Bar and Chain
(front chain tensioner)
A cutting attachment consists of the saw
chain, guide bar and chain sprocket. Removing the chain sprocket cover
The cutting attachment that comes
standard is designed to exactly match
the chain saw.
001BA244 KN
1
2 Your saw comes standard with a chain
143BA034 KN
scabbard that matches the cutting
001BA248 KN attachment.
a 3 If guide bars of different lengths are
N Unscrew the nut and remove the
mounted to the saw, always use a chain
chain sprocket cover.
scabbard of the correct length which
– The pitch (t) of the saw chain (1), covers the complete guide bar.
chain sprocket and the nose The length of the matching guide bars is
sprocket of the Rollomatic guide bar marked on the side of the chain
must match. scabbard.
– The drive link gauge (2) of the saw
chain (1) must match the groove 1
207BA009 KN
width of the guide bar (3). 2
If non-matching components are used,
the cutting attachment may be damaged N Turn the screw (1)
beyond repair after a short period of counterclockwise until the
operation. tensioning nut (2) butts against the
left end of the housing slot.
18 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Disengage the chain brake.
Mounting the Bar and Chain
(quick chain tensioner)
3 1 1
Removing the chain sprocket cover
2 4
207BA010 KN
001BA186 KN
N Fit the guide bar over the studs (1) –
the cutting edges on the top of the 1
bar must point to the right. 3 2
Pull the hand guard towards the
2310BA013 KN
N
front handle until there is an audible N Engage the peg of the tensioner
click – the chain brake is slide in the locating hole (2) –- place
disengaged. the chain over the sprocket (3) at
the same time. N Swing grip (1) into position (until it
Fitting the chain N Turn the tensioning screw (4) engages)
clockwise until there is very little N Turn the wing nut (2) to the left until
chain sag on the underside of the it hangs loosely in the chain
bar – and the drive link tangs are sprocket cover (3)
engaged in the bar groove.
N Remove chain sprocket cover (3)
N Refit the sprocket cover and screw
on the nut only fingertight. Mounting the tensioning gear
143BA003 KN
N Go to chapter on "Tensioning the
Saw Chain"
WARNING
1
Wear work gloves to protect your hands
2310BA014 KN
from the sharp cutters.
N Fit the chain – start at the bar nose.
N Remove and reverse tensioning
gear (1)
MS 170, MS 170 C, MS 180, MS 180 C 19English
Releasing the chain brake N Fit the saw chain – starting at the
nose of the guide bar – pay attention
2 to the position of the tensioning gear
and the cutting edges
N Turn tensioning gear (1) to the right
as far as possible
2310BA015 KN
N Turn the guide bar so that the
tensioning gear faces the user
001BA186 KN
N Remove screw (2)
1 N Pull hand guard towards the front 3
handle until it engages audibly – 2
chain brake is released
181BA013 KN
3 Fitting the saw chain
2310BA016 KN
N Place the saw chain on the chain
sprocket (2)
N Position tensioning gear (1) and
guide bar (3) relative to one another N Slide the guide bar over the collar
screw (3); the head of the rear collar
screw must protrude into the oblong
hole
2
2310BA017 KN
N Insert and tighten screw (2)
1
181BA012 KN
WARNING
Put on protective gloves – risk of injury
by the sharp cutters.
20 MS 170, MS 170 C, MS 180, MS 180 CEnglish
N turn the adjusting wheel (4) a little
until the chain sprocket cover can Mounting the Bar and Chain
be slid completely against the (side chain tensioner)
engine housing
Removing the chain sprocket cover
N Swing grip (5) into position (until it
engages)
N Fit wing nut and tighten lightly
N Next step: see "Tensioning the Saw
Chain"
143BA034 KN
135BA011 KN
N Unscrew nuts and remove chain
sprocket cover
N Guide the drive link into the bar
groove (see arrow) and turn the
1
tensioning gear to the left as far as
possible
N Fit chain sprocket cover, sliding the 2
001BA185 KN
guide lugs into the engine housing
openings
N Turn screw (1) to the left until the
4 tensioner slide (2) butts against the
left end of the housing slot
5
2310BA018 KN
When fitting the chain sprocket cover,
the teeth of the adjusting wheel and the
tensioning gear must mesh; if
necessary,
MS 170, MS 170 C, MS 180, MS 180 C 21English
Releasing the chain brake
Tensioning the Saw Chain
(front chain tensioner)
3 1 1
2 4
001BA187 KN
001BA186 KN
143BA045 KN
N Position the guide bar over the 1
bolts (1) – the cutting edges of the
saw chain must point to the right
N Pull hand guard towards the front
handle until it engages audibly – N Position the locating hole (2) over Retensioning during cutting work:
chain brake is released the peg of the tensioner slide –
N Switch off the engine.
simultaneously place the saw chain
Fitting the saw chain over the sprocket wheel (3) N Loosen the nuts.
N Turn screw (4) to the right until there N Hold the bar nose up.
is very little chain sag on the N Use a screwdriver to turn the
underside of the bar – and the drive tensioning screw (1) clockwise until
link tangs engage in the bar groove the chain fits snugly against the
N Refit the chain sprocket cover – and underside of the bar.
then screw on the nut by hand until N While still holding the bar nose up,
it is fingertight
143BA003 KN
tighten down the nuts firmly.
N Go to chapter "Tensioning the saw N Go to "Checking Chain Tension".
chain"
A new chain has to be retensioned more
often than one that has been in use for
WARNING some time.
Put on protective gloves – risk of injury N Check chain tension frequently –
by the sharp cutters see chapter on "Operating
Instructions".
N Fit the chain starting at the nose of
the guide bar
22 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Tensioning the Saw Chain Tensioning the Saw Chain Checking Chain Tension
(quick chain tensioner) (side chain tensioner)
1
2 1
133BA024 KN
001BA112 KN
143BA007 KN
Retensioning during cutting work: Retensioning during cutting work: N Shut off the engine.
N Shut off the engine. N Shut off the engine. N Wear work gloves to protect your
hands.
N Pull out the hinged clip and loosen N Loosen the nuts.
the wingnut. N The chain must fit snugly against
N Hold the bar nose up.
the underside of the bar and it must
N Turn the adjusting wheel (1)
N Use a screwdriver to turn the still be possible to pull the chain
clockwise as far as stop.
tensioning screw (1) clockwise until along the bar by hand.
N Tighten down the wingnut (2) firmly the chain fits snugly against the
N If necessary, retension the chain.
by hand. underside of the bar.
A new chain has to be retensioned more
N Fold down the hinged clip. N While still holding the bar nose up,
often than one that has been in use for
tighten down the nuts firmly.
N Go to "Checking Chain Tension" some time.
N Go to "Checking Chain Tension".
A new chain has to be retensioned more N Check chain tension frequently –
often than one that has been in use for A new chain has to be retensioned more see chapter on "Operating
some time. often than one that has been in use for Instructions".
some time.
N Check chain tension frequently –
see chapter on "Operating N Check chain tension frequently –
Instructions". see chapter on "Operating
Instructions".
MS 170, MS 170 C, MS 180, MS 180 C 23English
Gasoline with an ethanol content of Storing Fuel
Fuel more than 10% can cause running
problems in engines with a manually
adjustable carburetor and should not be Store fuel only in approved safety-type
Your engine requires a mixture of fuel canisters in a dry, cool and safe
gasoline and engine oil. used in such engines.
location protected from light and the sun.
Engines equipped with M-Tronic deliver
full power when run on gasoline with an Fuel mix ages – only mix sufficient fuel
WARNING for a few weeks work. Do not store fuel
ethanol content of up to 25% (E25).
For health reasons, avoid direct skin mix for longer than 30 days. Exposure to
contact with gasoline and avoid inhaling Engine Oil light, the sun, low or high temperatures
gasoline vapor. can quickly make the fuel mix unusable.
If you mix the fuel yourself, use only
STIHL two-stroke engine oil or another STIHL MotoMix may be stored for up to
STIHL MotoMix 2 years without any problems.
high-performance engine oil in
accordance with JASO FB, JASO FC, N Thoroughly shake the mixture in the
STIHL recommends the use of STIHL JASO FD, ISO-L-EGB, ISO-L-EGC or canister before fueling your
MotoMix. This ready-to-use fuel mix ISO-L-EGD. machine.
contains no benzol or lead, has a high STIHL specifies STIHL HP Ultra two-
octane rating and ensures that you stroke engine oil or an equivalent high- WARNING
always use the right mix ratio. performance engine oil in order to
Pressure may build up in the canister –
STIHL MotoMix uses STIHL HP Ultra maintain emission limits over the
open it carefully.
two-stroke engine oil for an extra long machine’s service life.
engine life. N Clean the fuel tank and canister
Mix Ratio from time to time.
MotoMix is not available in all markets.
STIHL 50:1 two-stroke engine oil: 50 Dispose of remaining fuel and cleaning
Mixing Fuel parts gasoline to 1 part oil fluid properly in accordance with local
regulations and environmental
Examples requirements.
NOTICE Gasoline STIHL engine oil 50:1
Liters Liters (ml)
Unsuitable fuels or lubricants or mix
ratios other than those specified may 1 0.02 (20)
result in serious damage to the engine. 5 0.10 (100)
Poor quality gasoline or engine oil may 10 0.20 (200)
damage the engine, sealing rings, hoses 15 0.30 (300)
and the fuel tank.
20 0.40 (400)
Gasoline 25 0.50 (500)
Use only high-quality brand-name N Use a canister approved for storing
gasoline with a minimum octane rating fuel. Pour oil into canister first, then
of 90 – leaded or unleaded. add gasoline and mix thoroughly.
24 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Fuel pick-up body replacement
Fueling Chain Lubricant
For automatic and reliable lubrication of
the chain and guide bar – use only an
environmentally compatible quality
chain and bar lubricant. Rapidly
Preparing the machine biodegradable STIHL BioPlus is
recommended.
NOTICE
Biological chain oil must be resistant to
aging (e.g. STIHL BioPlus), since it will
otherwise quickly turn to resin. This
results in hard deposits that are difficult
143BA000 KN
to remove, especially in the area of the
chain drive and chain. It may even cause
143BA009 KN
the oil pump to seize.
N Before fueling, clean the filler cap The service life of the chain and guide
and the area around it so that dirt bar depends on the quality of the
cannot fall into the tank. Change the fuel pick-up body every lubricant. It is therefore essential to use
year; to do this: only a specially formulated chain
N Always position the machine so that
the filler cap is facing upwards lubricant.
N Drain the fuel tank
N Open the filler cap N Pull the fuel pick-up body out of the WARNING
tank with a hook and disconnect it
Refueling from the hose Do not use waste oil. Renewed contact
with waste oil can cause skin cancer.
N Connect a new fuel pick-up body to Moreover, waste oil is environmentally
Take care not to spill fuel while fueling the hose harmful.
and do not overfill the tank.
N Return the fuel pick-up body to the
STIHL recommends use of the STIHL tank NOTICE
filling system for fuel (special
accessory). Waste oil does not have the necessary
lubricating properties and is unsuitable
for chain lubrication.
WARNING
After fueling, tighten down the filler cap
by hand as securely as possible.
Use a suitable tool (e. g., screwdriver of
the combination wrench) for slotted filler
caps.
MS 170, MS 170 C, MS 180, MS 180 C 25English
If the oil level in the tank does not go
Filling Chain Oil Tank down, the reason may be a fault in the oil Checking Chain Lubrication
supply system: Check chain lubrication,
clean the oilways, contact your dealer
for assistance if necessary STIHL
recommends that you have servicing
and repair work carried out exclusively
by an authorized STIHL servicing
Preparations dealer.
001BA158 KN
143BA024 KN
N Thoroughly clean the oil filler cap
and the area around it to ensure that
no dirt falls into the tank.
The saw chain must always throw off a
N Position the machine so that the
small amount of oil.
filler cap is facing up.
N Open the filler cap.
NOTICE
Fill up with chain oil. Never operate your saw without chain
lubrication. If the chain runs dry, the
whole cutting attachment will be
N Refill the chain oil tank every time irretrievably damaged within a very short
you refuel. time. Always check chain lubrication and
Take care not to spill chain oil while the oil level in the tank before starting
refilling and do not overfill the tank. work.
STIHL recommends you use the STIHL Every new chain has to be broken in for
filler nozzle for chain oil (special about 2 to 3 minutes.
accessory). After breaking in the chain, check chain
N Close the filler cap. tension and adjust if necessary – see
"Checking Chain Tension".
There must still be a small amount of oil
in the oil tank when the fuel tank is
empty.
26 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Releasing the chain brake The chain brake will operate only if the
Chain Brake hand guard has not been modified in any
way.
Check operation of the chain brake
Before starting work: Run engine at idle
Locking the chain speed, engage the chain brake (push
hand guard toward bar nose) and open
the throttle wide for no more than
3 seconds – the chain must not rotate.
The hand guard must be free from dirt
and move freely.
Chain brake maintenance
The chain brake is subject to normal
143BA012 KN
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel. STIHL recommends that you
have servicing and repair work carried
N Pull the hand guard back toward the out exclusively by an authorized STIHL
front handle, servicing dealer. Maintain the following
servicing intervals:
NOTICE
Full-time usage: every 3
143BA011 KN
Always disengage chain brake before months
accelerating the engine (except when Part-time usage: every 6
checking its operation) and before months
– in an emergency starting cutting work.
Occasional usage: every 12
– when starting High revs with the chain brake engaged months
– at idling speed (chain locked) will quickly damage the
powerhead and chain drive (clutch,
The chain brake is activated by pushing chain brake).
the hand guard toward the bar nose with
your left hand – or by inertia in certain The chain brake is also activated by the
kickback situations: The chain is inertia of the front hand guard if the
stopped and locked. kickback force of the saw is high
enough: The hand guard is accelerated
toward the bar nose – even if your left
hand is not behind the hand guard, e.g.
during felling cut.
MS 170, MS 170 C, MS 180, MS 180 C 27English
Adjusting the master control lever Holding the chain saw
Starting / Stopping the
Engine
To adjust the master control lever from There are two ways to hold the chain
run F to cold start l, press and hold saw during starting.
Positions of the master control lever
down the throttle trigger lockout and
throttle trigger simultaneously – set On the ground
master control lever.
To set the master control lever to warm
start n, first set it to cold start l, then
STOP push the master control lever into the
warm start n position.
Switching to the warm start n position
0 is only possible from the cold start l
position.
Simultaneously pressing the throttle
trigger lockout and blipping the throttle
trigger causes the master control lever
to jump from the warm start n position
to run F.
To switch off the engine, set the master
001BA140 KN
control lever to Stop 0.
207BA020 KN
Position cold start l
Stop 0 – engine off – ignition is switched – If the engine is cold
N Place the chain saw securely on the
off – If the engine stalls during opening of ground and assume a steady
Run F – Engine running or can start throttle after starting stance – the saw chain must not
– If the fuel tank has run empty touch any objects and also must not
Warm start n – this position is for
(engine stalled out) touch the ground
starting the warm engine – the master
control lever returns to run when the N With the left hand on handlebar,
Position warm start n
throttle trigger is squeezed press the chain saw firmly against
– If engine is warm (once the engine the ground – thumb wrapped
Cold start l – this position is for
has been running for approx. one around the handlebar
starting the cold engine
minute) N Place your right foot into the rear
– When the engine has fired for the handle
first time
– After ventilation of the combustion
chamber, if the engine was flooded
28 MS 170, MS 170 C, MS 180, MS 180 CEnglish
Between the knees or thighs Starting Versions with ErgoStart
The ErgoStart stores the energy for
starting the chain saw. For this reason, a
Standard versions
few seconds may pass between the
pulling of the starter rope and the
starting of the engine.
N With the right hand, pull the starter
grip slowly and smoothly –
simultaneously press down on the
handlebar – do not pull the starter
rope out all the way – risk of
breakage!
N Do not let the starter grip snap back
– guide it vertically back into the
housing so that the starter rope can
rewind properly
207BA021 KN
Starting the chain saw
207BA022 KN
N Clamp the rear handle between the
knees or thighs WARNING
N Grip the handlebar firmly with the There must not be anyone within the
N With the right hand, pull the starter
left hand – thumb wrapped around swivel range of the chain saw.
grip slowly until you feel it engage –
the handlebar and then give it a brisk strong pull – N Observe safety precautions
simultaneously press down on the
handlebar – do not pull the starter
rope out all the way – risk of
breakage! Do not let the starter grip
snap back – guide it vertically back
into the housing so that the starter
rope can rewind properly
With a new engine or after a long period
of disuse, it may be necessary to pull the
starter rope several times – to prime the
fuel line.
MS 170, MS 170 C, MS 180, MS 180 C 29English
For all versions When the engine has turned over for the
first time
STOP
207BA019 KN
0
0
3
1
207BA023 KN
N Pull the hand guard toward the
handlebar
The chain brake is released - the chain
N Move master control lever (3) to saw is ready for use.
2 warm start n and continue
cranking NOTICE
Once the engine is running Open the throttle only when the chain
207BA025 KN
brake is off. Increased engine speeds
with the chain brake on (saw chain is
stationary) will quickly damage the
N Push the hand guard (1) forwards – STOP
clutch and chain brake.
the saw chain is blocked
0
N Simultaneously press and hold At very low temperatures
down the throttle trigger lockout (2) 3 2
and throttle trigger – set master
207BA024 KN
N Let the engine warm up briefly with
control lever 4 the throttle slightly open
Position cold start l
Switching off the engine
– If engine is cold (even if the engine N Press the throttle trigger lockout (2)
has stalled during opening of and blip the throttle trigger (4); the
throttle after starting) master control lever (3) jumps to N Move the master control lever to the
run F and the engine begins to idle stop position 0
Position warm start n
– If engine is warm (once the engine If the engine does not start
NOTICE
has been running for approx. one
minute) The engine must be switched to idle
immediately – otherwise, damage to the The master control lever was not
N Hold and start the chain saw returned from the position cold start l
engine housing and chain brake may
occur when the chain brake is locked. to warm start n in time, the engine may
be flooded.
30 MS 170, MS 170 C, MS 180, MS 180 CEnglish
N Move the master control lever to the Chain cold
stop position 0 Operating Instructions
Tension is correct when the chain fits
N Remove the spark plug - see "Spark snugly against the underside of the bar
plug" but can still be pulled along the bar by
During the break-in period
hand. Retension if necessary – see
N Dry the spark plug
"Tensioning the Saw Chain".
N Crank the engine several times with A factory new machine should not be run
the starter – to clear the combustion at high revs (full throttle off load) for the Chain at operating temperature
chamber first three tank fillings. This avoids The chain stretches and begins to sag.
N Replace the spark plug – see "Spark unnecessarily high loads during the The drive links must not come out of the
plug" break-in period. As all moving parts bar groove on the underside of the bar –
have to bed in during the break-in the chain may otherwise jump off the
N Set the master control lever to warm period, the frictional resistances in the bar. Retension the chain – see
start n – even if the engine is cold shortblock are greater during this period. "Tensioning the Saw Chain".
N Restart the engine The engine develops its maximum
power after about 5 to 15 tank fillings.
NOTICE
During work The chain contracts as it cools down. If it
is not slackened off, it can damage the
crankshaft and bearings.
NOTICE After a long period of full-throttle
Do not make the mixture leaner to operation
achieve an apparent increase in power –
After a long period of full-throttle
this could damage the engine – see
operation, allow engine to run for a while
"Adjusting the Carburetor".
at idle speed so that the heat in the
engine can be dissipated by flow of
NOTICE cooling air. This protects engine-
mounted components (ignition,
Open the throttle only when the chain
carburetor) from thermal overload.
brake is off. Running the engine at high
revs with the chain brake engaged
(chain locked) will quickly damage the After finishing work
shortblock and chain drive (clutch, chain
brake). N Slacken off the chain if you have
retensioned it at operating
Check chain tension frequently temperature during work.
A new saw chain must be retensioned
more frequently than one that has been
in use already for an extended period.
MS 170, MS 170 C, MS 180, MS 180 C 31You can also read
