STIHL MS 231, 251 Instruction Manual
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STIHL MS 231, 251 Instruction Manual
English
Contents
Guide to Using this Manual 2 Maintaining and Sharpening the Dear Customer,
Safety Precautions 3 Saw Chain 39 Thank you for choosing a quality
Reactive Forces 8 Maintenance and Care 43 engineered STIHL product.
Minimize Wear and Avoid Damage 45
Original Instruction Manual
Working Techniques 9 It has been built using modern
Cutting Attachment 18 Main Parts 46 production techniques and
Specifications 47 comprehensive quality assurance.
Mounting the Bar and Chain (side
Every effort has been made to ensure
chain tensioner) 18 Ordering Spare Parts 48
your satisfaction and trouble-free use of
Mounting the Bar and Chain (quick Maintenance and Repairs 49 the product.
chain tensioner) 19 Disposal 49
Please contact your dealer or our sales
Tensioning the Saw Chain (side EC Declaration of Conformity 49 company if you have any queries
chain tensioner) 21
Printing inks contain vegetable oils, paper can be recycled.
concerning this product.
Tensioning the Saw Chain (quick
chain tensioner) 22 Your
Checking Chain Tension 22
Fuel 22
Fueling 23
Chain Lubricant 25
Printed on chlorine-free paper
Filling Chain Oil Tank 25 Dr. Nikolas Stihl
Checking Chain Lubrication 26
Chain Brake 26
Winter Operation 27
Starting / Stopping the Engine 28
Operating Instructions 32
Taking Care of the Guide Bar 33
Shroud 34
Air Filter System 34
© ANDREAS STIHL AG & Co. KG, 2020
Cleaning the Air Filter 35
Adjusting the Carburetor 36
Spark Plug 37
0458-737-0121-B. VB0.J20.
Storing the Machine 38
0000006607_011_GB
Checking and Replacing the Chain
Sprocket 38
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
MS 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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, Cliplock filler cap (bayonet-type)
distances – switch off the machine, chain sprockets, accessories or
engage the chain brake and attach the Place the cliplock filler
technically equivalent components that cap (bayonet-type) in
chain scabbard. This avoids the risk of have been approved by STIHL for this
the saw chain starting unintentionally. position, turn as far as
machine. If you have any questions in stop and fold the cliplock
this respect, consult a servicing dealer. down.
Use only high quality tools and
accessories. Otherwise, there may be a This helps reduce the risk of unit
risk of accidents and damage to the vibrations causing an incorrectly
machine. tightened filler cap to loosen or come off
and spill quantities of fuel.
STIHL recommends the use of genuine
001BA115 KN
STIHL tools, guide bars, chains, chain Look out for leaks! Never
sprockets and accessories. They are start the engine if fuel has
specifically designed to match your been spilled or is leaking
Always carry the chain saw by the model and meet your performance – Fatal burns may result!
handle – with the hot muffler away from requirements.
your body, the guide bar must point to
the rear. Avoid touching hot parts of the Refuelling Before Starting Work
machine, especially the surface of the
muffler – risk of burns!
Gasoline is an extremely Check that your saw is properly
In vehicles: Properly secure the machine flammable fuel – keep assembled and in good condition – refer
to prevent tipping, damage and chain oil clear of naked flames and to appropriate chapters in the instruction
or fuel spillage. fire – do not spill any fuel manual.
– no smoking. – Check the fuel system for leaks,
Cleaning paying special attention to visible
Switch off the engine before refuelling.
parts such as the tank cap, hose
Never refuel the machine while the connections and the manual fuel
Clean plastic parts with a cloth. Harsh engine is still hot – the fuel may spill over
detergents can damage the plastic. pump (on machines so equipped). If
– risk of fire!
4 MS 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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
bumper is not used – risk of pull-in – start
side (2) tree
the cut with the guide bar at the
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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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
crown
1. 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 231, MS 231 C, MS 251, MS 251 CEnglish
Felling cut with stabilizing strap (normal – Do not cut into the stabilizing strap
tree)
A) Thin trunks 1.
Implement this felling cut when the trunk 2.
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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 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 231, MS 231 C, MS 251, MS 251 C 17English
Chain Scabbard
Cutting Attachment Mounting the Bar and Chain
(side 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
533BA001 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 1
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
2
001BA185 KN
width of the guide bar (3).
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 tensioner
operation. slide (2) butts against the left end of
the housing slot.
18 MS 231, MS 231 C, MS 251, MS 251 CEnglish
Disengage the chain brake.
Mounting the Bar and Chain
(quick chain tensioner)
3 1 1
Removing the chain sprocket cover
2 4
001BA187 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
2310BA013 KN
N Pull the hand guard towards the
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 231, MS 231 C, MS 251, MS 251 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)
181BA012 KN
1
WARNING
Put on protective gloves – risk of injury
by the sharp cutters.
20 MS 231, MS 231 C, MS 251, MS 251 CEnglish
N turn the adjusting wheel (4) a little
until the chain sprocket cover can Tensioning the Saw Chain
be slid completely against the (side chain tensioner)
engine housing
N Swing grip (5) into position (until it
engages)
N Fit wing nut and tighten lightly
N Next step: see "Tensioning the Saw
142BA063 KN
Chain"
1
Retensioning during cutting work:
N Switch off the engine.
135BA011 KN
N Loosen the nut.
N Hold the bar nose up.
N Use a screwdriver to turn the
N Guide the drive link into the bar tensioning screw (1) clockwise until
groove (see arrow) and turn the the chain fits snugly against the
tensioning gear to the left as far as underside of the bar.
possible
N While still holding the bar nose up,
N Fit chain sprocket cover, sliding the tighten down the nut firmly.
guide lugs into the engine housing
openings N Go to "Checking Chain Tension".
A new chain has to be retensioned more
often than one that has been in use for
4 some time.
5 N Check chain tension frequently –
see chapter on "Operating
Instructions".
2310BA018 KN
When fitting the chain sprocket cover,
the teeth of the adjusting wheel and the
tensioning gear must mesh; if
necessary,
MS 231, MS 231 C, MS 251, MS 251 C 21English
Tensioning the Saw Chain Checking Chain Tension Fuel
(quick chain tensioner)
Your engine requires a mixture of
gasoline and engine oil.
1
WARNING
2 For health reasons, avoid direct skin
142BA064 KN
001BA112 KN
contact with gasoline and avoid inhaling
gasoline vapor.
STIHL MotoMix
Retensioning during cutting work: N Shut off the engine.
N Shut off the engine. N Wear work gloves to protect your
STIHL recommends the use of STIHL
hands.
N Pull out the hinged clip and loosen MotoMix. This ready-to-use fuel mix
the wingnut. N The chain must fit snugly against contains no benzol or lead, has a high
the underside of the bar and it must octane rating and ensures that you
N Turn the adjusting wheel (1)
still be possible to pull the chain always use the right mix ratio.
clockwise as far as stop.
along the bar by hand when the
STIHL MotoMix uses STIHL HP Ultra
N Tighten down the wingnut (2) firmly chain brake is released.
two-stroke engine oil for an extra long
by hand.
N If necessary, retension the chain. engine life.
N Fold down the hinged clip.
A new chain has to be retensioned more MotoMix is not available in all markets.
N Go to "Checking Chain Tension" often than one that has been in use for
some time. Mixing Fuel
A new chain has to be retensioned more
often than one that has been in use for N Check chain tension frequently –
some time. see chapter on "Operating
Instructions". NOTICE
N Check chain tension frequently –
see chapter on "Operating Unsuitable fuels or lubricants or mix
Instructions". 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.
22 MS 231, MS 231 C, MS 251, MS 251 CEnglish
Gasoline with an ethanol content of Storing Fuel
more than 10% can cause running Fueling
problems in engines with a manually
adjustable carburetor and should not be Store fuel only in approved safety-type
used in such engines. fuel canisters in a dry, cool and safe
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
ethanol content of up to 25% (E25). for a few weeks work. Do not store fuel
mix for longer than 30 days. Exposure to Preparing the machine
Engine Oil light, the sun, low or high temperatures
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
high-performance engine oil in 2 years without any problems.
accordance with JASO FB, JASO FC, N Thoroughly shake the mixture in the
JASO FD, ISO-L-EGB, ISO-L-EGC or canister before fueling your
ISO-L-EGD. machine.
001BA229 KN
STIHL specifies STIHL HP Ultra two-
stroke engine oil or an equivalent high- WARNING
performance engine oil in order to
Pressure may build up in the canister – N Before fueling, clean the cap and
maintain emission limits over the
open it carefully. the area around it to ensure that no
machine’s service life.
dirt falls into the fuel tank
N Clean the fuel tank and canister
Mix Ratio from time to time. N Always position the machine so that
STIHL 50:1 two-stroke engine oil: 50 the cap is facing upwards
Dispose of remaining fuel and cleaning
parts gasoline to 1 part oil fluid properly in accordance with local
regulations and environmental Opening
Examples requirements.
Gasoline STIHL engine oil 50:1
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
001BA236 KN
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
N Raise grip to vertical position.
N Use a canister approved for storing
fuel. Pour oil into canister first, then
add gasoline and mix thoroughly.
MS 231, MS 231 C, MS 251, MS 251 C 23English
Closing
001BA232 KN
001BA235 KN
001BA234 KN
N Turn the cap counterclockwise N Fold the grip down.
(about a quarter turn).
Grip must be vertical:
N Fit the cap – marks on tank cap and
fuel tank must line up.
N Press the cap down as far as stop.
001BA241 KN
001BA234 KN
Tank cap is locked.
Marks on tank cap and fuel tank must
line up. If the tank cap cannot be locked in the
001BA233 KN
fuel tank opening
Bottom of cap is twisted in relation to
N While holding the cap depressed, top.
turn it clockwise until it engages in
position. N Remove the cap from the fuel tank
001BA237 KN
and check it from above.
N Remove the tank cap.
Filling Up with Fuel
001BA231 KN
Take care not to spill fuel while fueling
and do not overfill the tank.
The marks on the tank cap and fuel tank
STIHL recommends you use the STIHL
are then in alignment.
filler nozzle for fuel (special accessory).
N Fill the fuel tank.
24 MS 231, MS 231 C, MS 251, MS 251 CEnglish
Chain Lubricant Filling Chain Oil Tank
For automatic and reliable lubrication of
1 the chain and guide bar – use only an
environmentally compatible quality
001BA238 KN
chain and bar lubricant. Rapidly
biodegradable STIHL BioPlus is
Preparations
recommended.
Left: Bottom of cap is twisted –
inner mark (1) in line with NOTICE
outer mark.
Biological chain oil must be resistant to
Right: Bottom of cap in correct posi-
aging (e.g. STIHL BioPlus), since it will
tion – inner mark is under the
otherwise quickly turn to resin. This
grip. It is not in line with the
results in hard deposits that are difficult
outer mark.
001BA158 KN
to remove, especially in the area of the
chain drive and chain. It may even cause
the oil pump to seize.
The service life of the chain and guide N Thoroughly clean the oil filler cap
bar depends on the quality of the and the area around it to ensure that
lubricant. It is therefore essential to use no dirt falls into the tank.
only a specially formulated chain
001BA239 KN
N Position the machine so that the
lubricant.
filler cap is facing up.
WARNING N Open the filler cap.
N Place the cap on the opening and
rotate it counterclockwise until it Do not use waste oil. Renewed contact Fill up with chain oil.
engages the filler neck. with waste oil can cause skin cancer.
Moreover, waste oil is environmentally
N Continue rotating the cap Refill the chain oil tank every time
harmful. N
counterclockwise (about a quarter you refuel.
turn) – this causes the bottom of the
cap to be turned to the correct NOTICE Take care not to spill chain oil while
position. refilling and do not overfill the tank.
Waste oil does not have the necessary
N Turn the cap clockwise and lock it in lubricating properties and is unsuitable STIHL recommends you use the STIHL
position – see section on "Closing". for chain lubrication. filler nozzle for chain oil (special
accessory).
N Close the filler cap.
There must still be a small amount of oil
in the oil tank when the fuel tank is
empty.
MS 231, MS 231 C, MS 251, MS 251 C 25English
If the oil level in the tank does not go
down, the reason may be a fault in the oil Checking Chain Lubrication Chain Brake
supply system: Check chain lubrication,
clean the oilways, contact your dealer
for assistance if necessary STIHL
recommends that you have servicing
and repair work carried out exclusively
by an authorized STIHL servicing
dealer. Locking the chain
143BA024 KN
The saw chain must always throw off a
small amount of oil.
143BA011 KN
NOTICE
Never operate your saw without chain
lubrication. If the chain runs dry, the
whole cutting attachment will be – in an emergency
irretrievably damaged within a very short
– when starting
time. Always check chain lubrication and
the oil level in the tank before starting – at idling speed
work.
The chain brake is activated by pushing
Every new chain has to be broken in for the hand guard toward the bar nose with
about 2 to 3 minutes. your left hand – or by inertia in certain
kickback situations: The chain is
After breaking in the chain, check chain
stopped and locked.
tension and adjust if necessary – see
"Checking Chain Tension".
26 MS 231, MS 231 C, MS 251, MS 251 CEnglish
Releasing the chain brake The chain brake will operate only if the
hand guard has not been modified in any Winter Operation
way.
Check operation of the chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push Pre-heating carburetor
hand guard toward bar nose) and open
the throttle wide for no more than
3 seconds – the chain must not rotate. N Remove the shroud – see "Shroud"
The hand guard must be free from dirt
At temperatures below +10 °C
and move freely.
Chain brake maintenance
The chain brake is subject to normal
143BA012 KN
wear. It is necessary to have it serviced
2310BA000 KN
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 N Using a screwdriver, pry the shutter
servicing intervals: out of the s (summer operation)
position
NOTICE
Full-time usage: every 3
Always disengage chain brake before months
accelerating the engine (except when Part-time usage: every 6
checking its operation) and before months
starting cutting work.
Occasional usage: every 12
High revs with the chain brake engaged months
2310BA001 KN
(chain locked) will quickly damage the
powerhead and chain drive (clutch,
chain brake).
The chain brake is also activated by the N Place the shutter with the opening in
inertia of the front hand guard if the the direction of the chain saw in
kickback force of the saw is high the r position (winter operation) –
enough: The hand guard is accelerated shutter must audibly snap into place
toward the bar nose – even if your left
N Fit the shroud – see "Shroud"
hand is not behind the hand guard, e.g.
during felling cut.
MS 231, MS 231 C, MS 251, MS 251 C 27English
Heated air is now drawn in from around Setting the Master Control Lever
the cylinder and circulates around the Starting / Stopping the
carburetor – this helps prevent Engine
carburetor icing. To move the Master Control lever from
the normal run position (F) to choke
Positions of Master Control Lever
At temperatures above +20 °C closed (l), press down the throttle
trigger lockout and squeeze the throttle
N Ensure that the shutter is always trigger at the same time and hold them in
returned to position s (summer that position – now set the Master
operation), otherwise the engine Control lever.
may malfunction due to overheating
STOP To select the starting throttle
position (n), move the Master Control
At temperatures below -10 °C
lever to choke closed (l) first, then
push it into the starting throttle
N if the chain saw is extremely cold
0 position (n).
(frost formation) – after starting,
The Master Control lever must be in the
bring the engine up to operating
choke closed position (l) for the
temperature at increased idle speed
changeover to the starting throttle
(disengage chain brake!)
position (n).
In case of erratic idling behavior or poor
The Master Control lever moves from
acceleration
the starting throttle position (n) to the
N Turn the low speed screw (L) run position (F) when you press down
001BA140 KN
1/4 turn counterclockwise the throttle trigger lockout and blip the
throttle trigger at the same time.
Whenever the low speed screw (L) has
been adjusted, it is usually also To switch off the engine, move the
necessary to adjust the idle speed Stop 0 – engine off – the ignition is Master Control lever to Stop (0).
adjusting screw (LA), see "Setting the switched off
carburetor". Normal run position F – engine runs or Choke shutter closed (l)
can fire. – if the engine is cold
Air filter system
Starting throttlen – this position is used – if the engine stalls when you open
to start a warm engine. The Master the throttle after starting.
N Retrofit new air filter if necessary – Control lever moves to the normal run
position as soon as the throttle trigger is – if the fuel tank was run until empty
see "Air filter system"
squeezed. (engine stopped).
Choke shutter closed l – this position Starting throttle position (n)
is used to start a cold engine.
– if the engine is warm, i.e. if it has
been running for about one minute.
– When the engine begins to fire
– after clearing a flooded combustion
chamber.
28 MS 231, MS 231 C, MS 251, MS 251 CEnglish
Fuel pump On the ground Between knees or thighs
Press the manual fuel pump bulb
several times – even if the bulb is
already filled with fuel:
– When starting for the first time.
– if the fuel tank was run until empty
(engine stopped).
Holding the Saw
There are two ways of holding the saw
when starting.
2310BA008 KN
2310BA009 KN
N Place your saw on the ground. N Hold the rear handle tightly between
Make sure you have a firm footing – your legs, just above the knees.
check that the chain is not touching
N Hold the front handle firmly with
any object or the ground.
your left hand – your thumb should
N Hold the saw firmly on the ground be under the handle.
with your left hand on the front
handle – your thumb should be
under the handle.
N Put your right foot into the rear
handle and press down.
MS 231, MS 231 C, MS 251, MS 251 C 29English
Cranking Versions with ErgoStart Starting the Saw
WARNING
Standard versions
This machine is extremely simple and WARNING
easy to start, even for children – risk of Bystanders must be well clear of the
accidents. general work area of the saw.
Do not allow children or other N Observe safety precautions.
unauthorized persons to attempt to start
or otherwise use the machine: Versions with manual fuel pump
– Never leave the machine
unattended during work breaks.
– After work, store the machine in a
safe, secure location.
The ErgoStart stores the energy
2310BA021 KN
required to start the saw. For this reason
there may be a delay of a few seconds
between cranking the engine and it
actually starting.
Press the manual fuel pump bulb at
231BA010 KN
N
There are two ways of starting with the least five times – even if the bulb is
ErgoStart: already filled with fuel.
N Pull the starter grip slowly with your N Hold the starter grip with your right
right hand until you feel it engage – hand and pull it out slowly and
and then give it a brisk strong pull steadily – or – hold the starter grip
and push down the front handle at with your right hand and give it
the same time. Do not pull out the several short pulls, using only a
starter rope to full length – it might short length of rope for each pull.
otherwise break. Do not let the N Push down the handle while
starter grip snap back. Guide it cranking. Do not pull out the rope to
slowly back into the housing so that its full length – it might otherwise
the starter rope can rewind properly. break.
Machines without additional manual fuel N Do not let the starter grip snap back.
pump: If the engine is new or after a long Guide it slowly back into the housing
out-of-service period, it may be so that the starter rope can rewind
necessary to pull the starter rope several properly.
times to prime the fuel system.
30 MS 231, MS 231 C, MS 251, MS 251 CEnglish
All models When engine begins to fire
STOP
001BA186 KN
4 0
0
2310BA003 KN
1 N Pull the hand guard back towards
the front handle.
N Set the Master Control lever (4) to The chain brake is now disengaged –
the starting throttle position (n). your saw is ready for operation.
4 2 N Hold and start your saw as
described. NOTICE
Always disengage chain brake before
2310BA002 KN
3 As soon as the engine runs accelerating the engine. High revs with
the chain brake engaged (chain locked)
will quickly damage the clutch and chain
N Push the hand guard (1) forward – STOP brake.
the chain is locked.
At very low outside temperatures
N Press down the trigger lockout (2) 4 0
and pull the throttle trigger (3) at the
same time. Set Master Control
2310BA004 KN
N Allow engine to warm up at part
lever (4) to: 3 throttle.
Choke shutter closed (l) N Change over to winter operation if
– if the engine is cold (also use this necessary – see “Winter Operation”.
N Press down trigger lockout and the
position if the engine stopped when blip the throttle trigger (3) – the
you opened the throttle after Master Control lever (4) moves to Stopping the engine
starting) the run position (F) and the engine
Starting throttle position (n) settles down to idling speed. N Move the Master Control lever to the
stop position (0).
– if the engine is warm, i.e. if it has
been running for about one minute. NOTICE
If the engine does not start
N Hold and start your saw as As the chain brake is still engaged, the
described. engine must be returned to idling speed
immediately – or the engine housing and If you did not move the Master Control
chain brake might otherwise be lever from the choke closed
damaged. position (l) to the starting throttle
MS 231, MS 231 C, MS 251, MS 251 C 31You can also read
