Stihl MS 241 C-M Instruction Manual

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MS 241 C-M

Instruction Manual2 - 42

English

Contents

1 Guide to Using this Manual.........................2

2 Safety Precautions......................................3

3 Reactive Forces.......................................... 7

4 Working Techniques................................... 8

5 Cutting Attachment................................... 15

6 Mounting the Bar and Chain (side chain ten‐

sioner)....................................................... 15

7 Mounting the Bar and Chain (quick chain

tensioner).................................................. 16

8 Tensioning the Saw Chain (side chain ten‐

sioner)....................................................... 18

9 Tensioning the Saw Chain (quick chain ten‐

sioner)....................................................... 18

10 Checking Chain Tension...........................19

11 Fuel........................................................... 19

12 Fueling...................................................... 20

13 Chain Lubricant.........................................22

14 Filling Chain Oil Tank................................22

15 Checking Chain Lubrication...................... 23

16 Chain Brake.............................................. 23

17 Winter Operation.......................................24

18 Electric Handle Heating............................ 24

19 Starting / Stopping the Engine.................. 25

20 Operating Instructions...............................28

21 Oil Quantity Control...................................29

22 Taking Care of the Guide Bar................... 29

23 Shroud...................................................... 30

24 Cleaning the Air Filter............................... 30

25 M-Tronic....................................................31

26 Spark Plug................................................ 31

27 Storing the Machine.................................. 32

28 Checking and Replacing the Chain

Sprocket....................................................32

29 Maintaining and Sharpening the Saw Chain

.................................................................. 33

30 Maintenance and Care..............................37

31 Minimize Wear and Avoid Damage...........38

32 Main Parts.................................................39

33 Specifications............................................39

34 Ordering Spare Parts................................ 41

35 Maintenance and Repairs......................... 41

36 Disposal.................................................... 41

37 EC Declaration of Conformity................... 41

38 UKCA Declaration of Conformity.............. 42

Dear Customer,

Thank you for choosing a quality engineered STIHL product.

It has been built using modern production techni‐ ques and comprehensive quality assurance. Every effort has been made to ensure your satis‐ faction and trouble-free use of the product.

Please contact your dealer or our sales company if you have any queries concerning this product.

Your

Dr. Nikolas Stihl

1 Guide to Using this Manual

This Instruction Manual refers to a STIHL chain saw, also called a machine in this Instruction Manual.

1.1 Pictograms

Pictograms that appear on the machine are explained in this Instruction Manual.

Depending on the machine and equipment ver‐ sion, the following pictograms may appear on the machine.

Fuel tank; fuel mixture of gasoline and engine oil

Tank for chain oil; chain oil

Engage and release chain brake

Coasting brake

Direction of chain travel

Ematic; chain oil flow adjustment

Tension saw chain

Intake air baffle: winter operation

Intake air baffle: summer operation

Handle heating

Actuate decompression valve

Original Instruction Manual

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Printed on chlorine-free paper

Printing inks contain vegetable oils, paper can be recycled.

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2 Safety Precautions English

Actuate manual fuel pump

1.2 Symbols in text

WARNING

Warning where there is a risk of an accident or personal injury or serious damage to property.

NOTICE

Caution where there is a risk of damaging the machine or its individual components.

1.3 Engineering improvements

STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.

Therefore, some changes, modifications and improvements may not be covered in this man‐ ual.

2 Safety Precautions

Special safety precautions must be observed to reduce the risk of per‐ sonal injury when working with a chain saw because of the very high chain speed and very sharp cutters.

It is important that you read the instruction manual before first use and keep it in a safe place for future reference. Non-observance of the instruction manual may result in seri‐ ous or even fatal injury.

2.1 General

Observe all applicable local safety regulations, standards and ordinances.

The use of noise emitting power tools may be restricted to certain times by national or local regulations.

If you have not used this model before: Have your dealer or other experienced user show you how to operate your machine or attend a special course in its operation.

Minors should never be allowed to use a chain saw.

Keep bystanders, especially children, and ani‐ mals away from the work area.

The user is responsible for avoiding injury to third parties or damage to their property.

Do not lend or rent your chain saw without the instruction manual. Be sure that anyone using it understands the information contained in this manual.

To operate a chain saw you must be rested, in good physical condition and mental health. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a chain saw.

Do not operate the chain saw if you are under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgment.

To reduce the risk of accidents or injury, put off the work in poor weather conditions (rain, snow, ice, wind).

Persons with pacemakers only: The ignition sys‐ tem of your chain saw produces an electromag‐ netic field of a very low intensity. This field may interfere with some pacemakers. To reduce health risks, STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer before operating this power tool.

2.2 Intended use

The machine may only be used to saw wood and wooden objects.

Do not use the machine for any other purpose – risk of accidents!

Do not modify the machine in any way – this may increase the risk of personal injury. STIHL excludes all liability for personal injury and dam‐ age to property caused while using unauthorised attachments.

2.3 Clothing and Equipment

Wear proper protective clothing and equipment.

Clothing must be sturdy and snug-fit‐ ting, but allow complete freedom of movement. Wear snug fitting clothing with cut-retardant pads – no loose-fit‐ ting jacket.

Avoid clothing that could get caught on branches, brush or moving parts of the machine. Do not wear a scarf, necktie or jewellery. Tie up and confine long hair (headscarf, cap, hard hat, etc.).

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English 2 Safety Precautions

Wear suitable safety shoes – with cutretardant material, non-slip soles and steel toe caps.

WARNING

To reduce the risk of eye injuries, wear tight-fitting safety goggles con‐ forming to standard EN 166 or a face shield. Make sure that the safety gog‐ gles and the face shield fit correctly.

Wear "personal" hearing protection – for exam‐ ple, ear defenders.

Wear a hard hat wherever there is any risk of falling objects.

Wear sturdy protective gloves made of a resistant material (e.g. leather).

STIHL can supply a comprehensive range of per‐ sonal protective equipment.

2.4 Transporting

Before any transport – even over short distances – switch off the machine, engage the chain brake and attach the chain scabbard. This avoids the risk of the saw chain starting unintentionally.

Always carry the chain saw by the handle – with the hot muffler away from your body, the guide bar must point to the rear. To avoid serious burn injuries, avoid touching hot parts of the machine, especially the surface of the muffler.

In vehicles: Properly secure your saw to prevent turnover, fuel spillage and damage.

2.5 Cleaning

Clean plastic parts with a cloth. Harsh detergents can damage the plastic.

Clean the dust and dirt off the machine – do not use any grease solvents for this purpose.

Clean the ventilation slots if necessary.

Do not use a high-pressure cleaner to clean the machine. The hard jet of water can damage parts of the machine.

2.6 Accessories

Only use those tools, guide bars, chains, chain sprockets, accessories or technically equivalent components that have been approved by STIHL for this machine. If you have any questions in this respect, consult a servicing dealer. Use only high quality tools and accessories. Otherwise, there may be a risk of accidents and damage to the machine.

STIHL recommends the use of genuine STIHL tools, guide bars, chains, chain sprockets and accessories. They are specifically designed to match your model and meet your performance requirements.

2.7 Refuelling

Gasoline is an extremely flammable fuel – keep clear of naked flames and fire – do not spill any fuel – no smok‐ ing.

Switch off the engine before refuelling.

Never refuel the machine while the engine is still hot – the fuel may spill over – risk of fire!

Open the fuel filler cap carefully so that any excess pressure is relieved gradually and fuel does not splash out.

The machine may only be refuelled in a well ven‐ tilated place. Clean the machine immediately if fuel is spilled. Do not spill fuel over your clothing – contaminated clothing must be changed imme‐ diately.

The machines can be equipped with the follow‐ ing filler caps as standard:

Cliplock filler cap (bayonet-type)

Place the cliplock filler cap (bayonettype) in position, turn as far as stop and fold the cliplock down.

This helps reduce the risk of unit vibrations caus‐ ing an incorrectly tightened filler cap to loosen or come off and spill quantities of fuel.

Look out for leaks! Never start the engine if fuel has been spilled or is leaking – Fatal burns may result!

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2 Safety Precautions English

2.8 Before Starting Work

Check that your saw is properly assembled and in good condition – refer to appropriate chapters in the instruction manual.

Check the fuel system for leaks, paying spe‐

–

cial attention to visible parts such as the tank cap, hose connections and the manual fuel pump (on machines so equipped). If there are any leaks or damage, do not start the engine – risk of fire. Have your saw repaired by a serv‐ icing dealer before using it again. Check operation of chain brake, front hand

–

guard Correctly mounted guide bar

–

Correctly tensioned chain

–

The trigger and trigger lockout must move

–

freely and spring back to the idle position when they are released. Master Control lever must move easily to

–

STOP, 0 or † Check that the spark plug boot is secure – a

–

loose boot may cause arcing that could ignite combustible fumes and cause a fire. Never attempt to modify the controls or safety

–

devices in any way. Keep the handles dry and clean – free from oil

–

and dirt – for safe control of the saw. Make sure there is sufficient fuel and chain oil

–

in the tanks.

To reduce the risk of personal injury, do not operate your saw if it is damaged or not properly assembled.

2.9 Starting the chain saw

Always work on a level surface. Ensure a firm and secure footing. Hold the machine securely – the chain must not touch any objects or the floor – danger of injury due to the rotating saw chain.

Your chain saw is a one-person saw. Do not allow other persons to be in the working area – not even while starting.

Do not start the chain saw if the chain is in a cut.

Move at least 3 meters away from the place where the machine was refuelled and never start the motor in enclosed spaces.

Lock the chain with the chain brake before start‐ ing – risk of injury due to rotating chain!

Do not drop-start the engine – start as described in the Instruction Manual.

2.10 During operation

Ensure you always have a firm and safe footing. Take special care when the bark is wet – danger of slipping!

Always hold the chain saw firmly with both hands: Right hand on the rear handle – even if you are left-handed. To ensure reliable control, wrap your thumbs tightly around the handlebar and handle.

In the event of impending danger or in an emer‐ gency, switch off the engine immediately by mov‐ ing the Master Control lever / stop switch to STOP, 0 or †.

Never let the machine run unattended.

Exercise caution with slippery surfaces, water, snow, ice, steep slopes, uneven ground or green wood that has just been stripped of its bark – danger of slipping!

Use caution with tree stumps, roots, ditches – danger of stumbling!

Do not work alone – keep within calling distance of others who are trained in emergency proce‐ dures and can provide help in an emergency. Helpers at the cutting site must also wear protec‐ tive clothing (helmet!) and stand well clear of the branches being cut.

More care and attention than usual are required when wearing ear protection, as warning sounds (shouts, beeps, etc.) cannot be heard properly.

Take a break in good time to avoid tiredness or exhaustion – risk of accidents!

Dust (e. g., sawdust), fumes and smoke pro‐ duced while using the machine may be hazard‐ ous to health. If dust is generated, wear a dust mask.

When the engine is running: Note that the saw chain continues to rotate for a short period after you let go of the throttle trigger – coasting effect.

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English 2 Safety Precautions

No smoking when working with or near the chain saw - risk of fire! Combustible fuel vapour may escape from the fuel system.

Examine the saw chain periodically at short inter‐ vals and as soon as you note any tangible changes:

Switch off the engine; wait until the saw chain

–

is stationary Check condition and secure fitting

–

Check sharpness

–

Never touch the saw chain when the engine is running. If the saw chain becomes jammed by an object, switch off the engine immediately before attempting to remove the object – risk of injury!

Always turn off the engine before leaving the machine unattended.

To change the saw chain, switch off the engine. Risk of injury from the motor starting unintention‐ ally!

Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot mufflers – risk of fire! Mufflers with catalytic converters can become especially hot.

Never work without chain lubrication – monitor the oil level in the oil tank. Stop work immediately if the oil level in the oil tank is too low and top up with chain oil – see also "Topping up with chain oil" and "Check chain lubrication".

If the machine is subjected to unusually high loads for which it was not designed (e. g., heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before starting work".

Check the fuel system for leaks and make sure the safety devices are working properly. Never continue using a machine that is not in perfect working order. In case of doubt, have the unit checked by your servicing dealer.

Check for correct idling, so that the saw chain stops moving when the throttle trigger is released. Check the idle setting regularly and correct when possible. Have the machine repaired by a STIHL servicing dealer if the saw chain still continues to move during idling.

The chain saw produces poisonous exhaust gases as soon as the engine starts. These gases may be colour‐ less and odourless and may contain unburnt hydrocarbons and benzene. Never work with the machine indoors or in poorly ventilated areas, even if

Ensure proper ventilation when working in trenches, hollows or other confined locations – risk of fatal injury from breathing toxic fumes!

If you feel sick, have a headache, vision prob‐ lems (e. g., your field of vision gets smaller), hearing problems, dizziness or inability to con‐ centrate, stop work immediately. Such symptoms may be caused by an excessively high concen‐ tration of exhaust emissions – risk of accident!

2.11 After finishing work

Switch off the motor, engage the chain brake and attach the chain scabbard.

2.12 Storage

When the machine is not in use, it should be stored in such a way that no-one is endangered. Secure the machine against unauthorised use.

Store the machine in a safe, dry room.

2.13 Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).

No general recommendation can be given for the length of usage because it depends on several factors.

The period of usage is prolonged by:

– –

The period of usage is shortened by:

–

– –

Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.

2.14 Maintenance and repairs

Always switch off the engine before any repair, cleaning or maintenance work and any work on the chain. Risk of injury if the engine starts inad‐ vertently!

The machine must be serviced regularly. Do not attempt any maintenance or repair work not

your machine is equipped with a cata‐ lytic converter.

Hand protection (wearing warm gloves) Work breaks

Any personal tendency to suffer from poor cir‐ culation (symptoms: frequently cold fingers, tingling sensations). Low outside temperatures. The force with which the handles are held (a tight grip restricts circulation).

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3 Reactive Forces English

described in the Instruction Manual. All other work should be carried out by a servicing dealer.

STIHL recommends that maintenance and repair work be carried out only by authorised STIHL dealers. STIHL dealers receive regular training and are supplied with technical information.

Use only high-quality spare parts. Otherwise, there may be a risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.

Do not modify the machine in any way – this may increase the risk of personal injury –risk of acci‐ dents!

To reduce the risk of fire due to ignition outside the cylinder, move the master control level to STOP, 0 or † before turning the engine over on the starter when the spark plug boot is removed or the spark plug is unscrewed!

Do not service or store the machine near a naked flame – risk of fire due to the fuel!

Check fuel cap regularly for tightness.

Use only spark plugs that are in perfect condition and have been approved by STIHL – see "Speci‐ fications".

Check ignition lead (insulation in good condition, secure connection).

Check that the muffler is in perfect working con‐ dition.

Do not use the machine if the muffler is damaged or missing – risk of fire, damage to hearing!

Never touch a hot muffler – risk of burns!

The condition of the anti-vibration elements influ‐ ences vibration behaviour – inspect anti-vibration elements periodically.

Inspect chain catcher – replace if damaged.

Switch off the engine

To check the chain tension

–

To retension the chain

–

To replace the chain

–

For remedying malfunctions

–

Observe sharpening instructions – for safe and proper handling, always keep the chain and guide bar in flawless condition. Keep the chain properly sharpened, tensioned and well lubrica‐ ted.

Change chain, guide bar and chain sprocket in due time.

Regularly check that the clutch drum is in perfect working condition.

Always store fuel and chain lubricant only in the specified type of containers and ensure they are correctly labelled. Store in a dry, cool and secure place protected against light and sunlight.

In the event of a chain brake malfunction, switch off the machine immediately – risk of injury! Con‐ sult a servicing dealer – do not use the machine until the malfunction has been remedied, see "Chain brake".

3 Reactive Forces

The most common reactive forces that occur dur‐ ing cutting are: kickback, pushback and pull-in.

3.1 Dangers of kickback

Kickback can result in serious or fatal injury.

(Kickback) occurs when the saw is suddenly thrown up and back in an uncontrolled arc towards the operator.

3.2 Kickback occurs if, e. g.,

when the upper quadrant of the bar nose unin‐

–

tentionally contacts wood or another solid object, e.g. when another limb is touched acci‐ dentally during limbing. when the chain at the nose of the guide bar is

–

pinched in the cut.

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English 4 Working Techniques

3.3 Quickstop chain brake:

This device reduces the risk of injury in certain situations – it cannot prevent kickback. When activated, the chain brake stops the saw chain within a fraction of a second – see the section "Saw chain" in this Instruction Manual.

3.6 Pushback (B)

3.4 To reduce the risk of kickback

Work cautiously and avoid situations which

–

could cause kickback. Hold the saw firmly with both hands and main‐

–

tain a secure grip. always cut at full throttle.

–

Be aware of the location of the guide bar nose

–

at all times. do not cut with the bar nose.

–

Take special care with small, tough limbs, they

–

may catch the chain. never cut several limbs at once.

–

do not overreach.

–

never cut above shoulder height.

–

Use extreme caution when re-entering a previ‐

–

ous cut. Do not attempt plunge cuts if you are not

–

experience in this cutting technique. be alert for shifting of the log or other forces

–

that may cause the cut to close and pinch the chain. always cut with a correctly sharpened, prop‐

–

erly tensioned chain – the depth gauge setting must not be too large. Use a low kickback chain and a narrow radius

–

guide bar.

3.5 Pull-in (A)

Pushback occurs when the chain on the top of the bar is suddenly pinched, caught or encoun‐ ters a foreign object in the wood. The reaction of the chain drives the saw straight back toward the operator – to avoid this risk:

Be alert to situations that may cause the top of

–

the guide bar to be pinched Do not twist the guide bar in the cut

–

3.7 Exercise extreme caution

with leaners

–

with trees that have fallen unfavorably

–

between other trees and are under strain when working in blowdown areas.

–

In these cases, do not use a chain saw – use a hoist, winch or drag line instead.

Pull out exposed and cleared logs. Select clear area for cutting.

Deadwood (dry, decayed or rotted wood) repre‐ sents a considerable risk that is difficult to assess. Identifying the extent of the dangers is complicated, if not impossible. Use aids such as a cable winch or tractor in such cases.

When felling in the vicinity of roads, railways, power lines, etc., take extra precautions. If nec‐ essary, inform the police, utility company or rail‐ way authority.

4 Working Techniques

Sawing and felling work, including all related work (plunge cutting, limbing, etc.) may only be carried out by persons who have been specially trained and instructed. Persons who are not

Pull-in occurs when the chain on the bottom of the bar is suddenly pinched, caught or encoun‐ ters a foreign object in the wood. The reaction of the chain pulls the saw forward – to reduce this risk, always engage the spiked bumper securely in the tree or limb.

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experienced chain saw users should not carry out any such work – increased risk of accidents!

Country-specific legislation on felling technique must be complied with during felling work.

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4 Working Techniques

4.1 Sawing

Do not operate your saw with the starting throttle lock engaged. Engine speed cannot be control‐ led with the throttle trigger in this position.

Work calmly and carefully – in daylight conditions and only when visibility is good. Ensure you do not endanger others – stay alert at all times.

It is advisable for first-time users to practice cut‐ ting logs on a sawbuck – see "Sawing thin wood".

Use the shortest possible guide bar: The chain, guide bar and chain sprocket must match each other and your saw.

Position the saw so that your body is clear of the cutting attachment.

Always pull the saw out of the cut with the chain running.

Use your chain saw for cutting only. It is not designed for prying or shoveling away limbs, roots or other objects.

Do not underbuck freely hanging limbs.

Be careful when cutting scrub and young trees. Thin shoots can be scooped up by the chain saw and hurled towards the user.

Be careful when cutting splintered wood – Risk of injury from ejected pieces of wood!

Make sure your saw does not touch any foreign materials: Stones, nails, etc. may be flung off and damage the saw chain. The chain saw may kick back unexpectedly – risk of accident!

If a rotating saw chain hits a stone or another hard object, sparks may be generated which may ignite easily flammable materials under certain conditions. Also dried-out plants and brushwood are combustible, above all in hot and dry weather. If there is a risk of fire, do not use the chain saw in the vicinity of easily combustible materials, dry plants or scrub. It is mandatory

English

that you ask the responsible forestry office about the current fire hazard.

If on a slope, stand on the uphill side of the log. Watch out for rolling logs.

When working at heights:

Always use a lift bucket

–

Never use the machine while standing on a

–

ladder or in a tree Never work on an insecure support

–

Never work above shoulder height

–

Never use the machine with just one hand

–

Begin cutting with the saw at full throttle and engage the spiked bumper firmly in the wood, and then continue cutting.

Never work without the spiked bumper because the saw may pull you forwards and off balance. Always hold the spiked bumper securely against the tree or limb.

At the end of the cut, the chain saw is no longer supported by the cutting attachment in the cut. The chain saw's weight must be borne by the user – risk of loss of control!

Sawing thin wood:

Use a sturdy and stable support – sawhorse.

–

Never hold the log with your leg or foot.

–

never allow another person to hold the log or

–

help in any other way.

Limbing

use a low kickback chain.

–

Work with the saw supported wherever possi‐

–

ble. do not stand on the log while limbing it.

–

do not cut with the bar nose.

–

watch for limbs which are under tension.

–

never cut several limbs at once.

–

Lying or standing logs under tension:

Always make the cuts in the correct order (first compression side (1), then tension side (2)), oth‐ erwise the cutting attachment may stick in the cut or kick back – risk of injury!

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English 4 Working Techniques

Make sure no-one is endangered by the falling tree – the noise of your engine may drown any warning calls.

Maintain a distance of at least 2 1/2 tree lengths from the next felling site.

Determining direction of fall and escape path

Select gap in stand into which you want the tree to fall.

► Make relieving cut at the compression side (1) ► Make bucking cut at the tension side (2)

Be wary of pushback when making bucking cut from the bottom upwards (underbuck).

NOTICE

Do not cut a lying log at a point where it is touch‐ ing the ground because the saw chain will other‐ wise be damaged.

Ripping:

Pay special attention to the following points:

The natural inclination of the tree

–

Unusually heavy limb structure, asymmetrical

–

growth, damage to tree The wind direction and speed – do not fell in

–

high winds Direction of slope

–

Neighboring trees

–

Snow load

–

Take the general condition of the tree into

–

account – be especially careful with trunk damage or deadwood (brittle, rotten or dead wood)

Sawing technique without use of the spiked bumper – risk of pull-in – position the guide bar at as shallow an angle as possible – be especially careful – increased risk of kickback!

4.2 Preparing for felling

Check that there are no other persons in the fell‐ ing area – other than helpers.

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A Direction of fall

B Escape path (escape routes)

Establish escape paths for each worker –

–

approx. 45° diagonally opposite to the direc‐ tion of fall Clear escape paths, eliminate obstacles

–

Put down tools and equipment at a safe dis‐

–

tance – but not on the escape paths

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When felling, stand only to the side of the fall‐

–

ing trunk and only move back laterally onto the escape path Plan escape paths on slopes parallel to the

–

Determine direction of fall with gunning sight on cover and fan housing

slope When walking away along the escape path,

–

watch out for falling limbs and watch the top of the tree.

Preparing work area at base of tree

First clear the tree base and work area from

–

interfering limbs and brush to provide a secure footing. Carefully clear the base of the trunk (e.g., with

–

an axe) – sand, stones and other foreign objects will blunt the saw chain

Your chainsaw has a gunning sight on the cover and fan housing. Use this gunning sight.

Making the felling notch

When making a felling notch, align the chainsaw so that the notch lies at a right angle to the direc‐ tion of fall.

During the procedure, various sequences are permitted for making a felling notch with a bottom (horizontal) cut and top (angled) cut – comply with national legislation regarding felling techni‐ que.

Remove largest buttresses: first the largest

–

buttress – saw first vertically, then horizontally – only if the tree is in sound condition

4.3 Felling notch

► Make a bottom (horizontal) cut ► Make the top (angled) cut approx. 45°‑ 60° to

the bottom cut

Checking the direction of fall

Preparing the felling notch

► Insert the chainsaw with guide bar in the bot‐

The felling notch (C) determines the direction of fall.

Important:

Make a felling notch at right angle to direction

–

tom of the felling notch. The gunning sight must point in the planned direction of fall – if necessary, correct direction of fall by re-cutting the felling notch.

of fall Saw as close to the ground as possible

–

Cut to a depth of approx. 1/5 to 1/3 of the

–

diameter of the trunk

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English

4.4 Sapwood cuts

Sapwood cuts in long-fibered softwood help pre‐ vent sapwood splintering when the tree falls. Make cuts at both sides of the trunk at same height as bottom of felling notch to a depth of about 1/10 of trunk diameter. On large diameter trees, cut to no more than width of guide bar.

Do not make sapwood cuts if wood is diseased.

4.5 Basic information on felling cut

Basic dimensions

4 Working Techniques

With rotten trunks, leave a wider strip

–

Plunge cutting

For relieving cuts during shortening

–

For wood carving

–

► Use a low kickback saw chain and proceed

with special care

1. Begin cut by applying the lower portion of the guide bar nose – do not use upper portion because of risk of kickback. Cut at full strength until the depth of the kerf is twice the width of the guide bar

2. Swing the machine slowly into the plunge cutting position – risk of kickback and push‐ back!

3. Make the plunge cut very carefully. Risk of pushback.

The felling notch (C) determines the direction of fall.

The hinge (D) functions like a real hinge to guide the tree to the ground.

Width of hinge: approx. 1/10 of the trunk diam‐

–

eter Never saw through the hinge while felling –

–

otherwise the tree will fall in a direction other than the one planned – risk of accident! With rotten trunks, leave a wider hinge

–

The tree is felled with the felling cut (E).

Cut horizontally

–

1/10 (at least 3 cm) of tree diameter higher

–

than bottom of felling notch (C).

The holding strap (F) or stabilizing strap (G) sup‐ ports the tree and helps prevent it from falling prematurely.

Width of strip: approx. 1/10 to 1/5 of the trunk

–

diameter Do not cut into the strip during the felling cut

–

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Where possible, use a plunge blade. The plunge blade and the upper/lower side of the guide bar are parallel.

During plunge cutting, the plunge bar helps to keep the hinge parallel in form, i.e. the same thickness at all points. To do this, guide the plunge bar parallel to the sink chord.

Felling wedges

Insert the felling wedge as soon as possible, i.e. as soon as no obstruction of saw control is to be expected. Position the felling wedge in the felling cut and drive in with suitable tools.

Only use aluminum or plastic wedges – do not use steel wedges. Steel wedges can seriously

001BA260 KN

001BA261 KN

001BA273 KN

001BA263 KN

4 Working Techniques English

damage the saw chain and cause dangerous kickback.

Select suitable felling wedges dependent on the trunk diameter and the width of the kerf (ana‐ logue to felling cut (E)).

Contact the STIHL dealer for the selection of the felling wedge (suitable length, width and height).

4.6 Selecting the appropriate felling cut

The selection of the appropriate felling cut is dependent on the same tree characteristics that must be noted when determining the direction of fall and the escape paths.

There are various different features of these characteristics. This User Manual will only describe the two most commonly occurring var‐ iants:

left: Normal tree – vertically upright tree

with uniform crown

right: Leaner tree - crown pointing in direc‐

tion of fall

Shout a warning before starting the felling cut. ► Plunge cut the felling cut (E) – plunge the

guide bar fully in

► Engage the spiked bumper behind the hinge

and use this as the rotation point – reposition the chainsaw as little as possible

► Make the felling cut up to the hinge (1)

Do not cut into the hinge

–

► Make the felling cut up to the stabilizing

strap (2)

Do not cut into the stabilizing strap

–

► Set the felling wedge (3)

Shout a second warning immediately before the tree falls. ► Cut through the stabilizing strap, horizontal

level with the felling cut, with arms fully exten‐ ded

B) Thick trunks

Implement this felling cut when the trunk diame‐ ter is greater than the cutting length of the machine.

4.7 Felling cut with stabilizing strap (normal tree)

A) Thin trunks

Implement this felling cut when the trunk diame‐ ter is smaller than the cutting length of the chain‐ saw.

Shout a warning before starting the felling cut. ► Engage the spiked bumper at the height of the

felling cut and use this as the rotation point –

0458-738-0121-D 13

reposition the chainsaw as little as possible

► Tip of the guide bar must penetrate the wood

before the hinge (1) – guide the chainsaw absolutely horizontally and swivel as widely as possible

► Make the felling cut up to the hinge (2)

Do not cut into the hinge

–

001BA274 KN

001BA265 KN

001BA266 KN

001BA267 KN

English 4 Working Techniques

► Make the felling cut up to the stabilizing

strap (3)

Do not cut into the stabilizing strap

–

The felling cut must be continued on the oppo‐

► Make the felling cut towards the holding strap

(2)

Cut horizontally

–

Do not cut into the holding strap.

–

site side of the trunk.

Ensure that the second cut is at the same level as the first cut. ► Plunge cut the felling cut ► Make the felling cut up to the hinge (4)

Do not cut into the hinge

–

► Make the felling cut up to the stabilizing

strap (5)

Do not cut into the stabilizing strap

–

Shout a second warning immediately before the tree falls. ► With outstretched arms, cut through the hold‐

ing strap at a downward angle from outside.

B) Thick trunks

► Set the felling wedge (6)

Shout a second warning immediately before the tree falls. ► Cut through the stabilizing strap, horizontal

level with the felling cut, with arms fully exten‐ ded

4.8 Felling Cut with Holding Strap (Leaner)

A) Thin trunks

Implement this felling cut when the trunk diame‐ ter is smaller than the cutting length of the chain‐ saw.

Perform this felling cut when the tree diameter is greater than the cutting length of the chainsaw. ► Engage the spiked bumper behind the holding

strap and use it as a pivot – avoid reposition‐ ing the chainsaw more than necessary.

► The guide bar nose enters the wood (1) before

it reaches the hinge – hold the chainsaw hori‐ zontally and swing it as far as possible.

Do not cut into the holding strap or hinge.

–

► Make the felling cut up to the hinge (2)

Do not cut into the hinge

–

► Make the felling cut up to the holding strap (3)

Do not cut into the holding strap.

–

The felling cut must be continued on the oppo‐ site side of the trunk.

Ensure that the second cut is at the same level

► Plunge cut the guide bar into the trunk until it

exits on the other side

► Make the felling cut (E) towards the hinge (1)

Cut horizontally

–

Do not cut into the hinge

–

as the first cut. ► Engage the spiked bumper behind the hinge

and use this as the rotation point – reposition the chainsaw as little as possible

14 0458-738-0121-D

001BA268 KN

001BA248 KN

001BA244 KN

533BA001 KN

001BA185 KN

5 Cutting Attachment English

► Tip of the guide bar must penetrate the wood

before the holding strap (4) – guide the chain‐ saw absolutely horizontally and swivel as widely as possible

► Make the felling cut up to the hinge (5)

Do not cut into the hinge

–

► Make the felling cut up to the holding strap (6)

Do not cut into the holding strap.

–

Shout a second warning immediately before the tree falls. ► With outstretched arms, cut through the hold‐

ing strap at a downward angle from outside.

5.1 Chain Scabbard

Your saw comes standard with a chain scabbard that matches the cutting attachment.

If guide bars of different lengths are mounted to the saw, always use a chain scabbard of the cor‐ rect length which covers the complete guide bar.

The length of the matching guide bars is marked on the side of the chain scabbard.

6 Mounting the Bar and

Chain (side chain ten‐

5 Cutting Attachment

A cutting attachment consists of the saw chain, guide bar and chain sprocket.

The cutting attachment that comes standard is designed to exactly match the chain saw.

sioner)

6.1 Removing the chain sprocket cover

► Unscrew the nut and remove the chain

The pitch (t) of the saw chain (1), chain

–

sprocket and the nose sprocket of the Rollo‐ matic guide bar must match. The drive link gauge (2) of the saw chain (1)

–

must match the groove width of the guide bar (3).

If non-matching components are used, the cut‐ ting attachment may be damaged beyond repair after a short period of operation.

sprocket cover.

0458-738-0121-D 15

001BA186 KN

143BA003 KN

001BA187 KN

2310BA013 KN

2310BA014 KN

2310BA015 KN

English 7 Mounting the Bar and Chain (quick chain tensioner)

► Turn the screw (1) counterclockwise until the

tensioner slide (2) butts against the left end of the housing slot.

6.2 Disengage the chain brake.

► Turn the tensioning screw (4) clockwise until

there is very little chain sag on the underside of the bar – and the drive link tangs are engaged in the bar groove.

► Refit the sprocket cover and screw on the nut

only fingertight.

► Go to chapter on "Tensioning the Saw Chain"

7 Mounting the Bar and

Chain (quick chain ten‐ sioner)

7.1 Removing the chain sprocket cover

► Pull the hand guard towards the front handle

until there is an audible click – the chain brake is disengaged.

6.3 Fitting the chain

► Swing grip (1) into position (until it engages) ► Turn the wing nut (2) to the left until it hangs

loosely in the chain sprocket cover (3)

► Remove chain sprocket cover (3)

7.2 Mounting the tensioning gear

WARNING

Wear work gloves to protect your hands from the sharp cutters.

► Fit the chain – start at the bar nose.

► Remove and reverse tensioning gear (1)

► Fit the guide bar over the studs (1) – the cut‐

ting edges on the top of the bar must point to the right.

► Engage the peg of the tensioner slide in the

locating hole (2) –- place the chain over the sprocket (3) at the same time.

16 0458-738-0121-D

2310BA016 KN

2310BA017 KN

001BA186 KN

181BA012 KN

181BA013 KN

7 Mounting the Bar and Chain (quick chain tensioner) English

► Remove screw (2)

► Position tensioning gear (1) and guide bar (3)

relative to one another

7.4 Fitting the saw chain

► Insert and tighten screw (2)

7.3 Releasing the chain brake

► Pull hand guard towards the front handle until

it engages audibly – chain brake is released

WARNING

Put on protective gloves – risk of injury by the sharp cutters.

► Fit the saw chain – starting at the nose of the

guide bar – pay attention to the position of the tensioning gear and the cutting edges

► Turn tensioning gear (1) to the right as far as

possible

► Turn the guide bar so that the tensioning gear

faces the user

► Place the saw chain on the chain sprocket (2) ► Slide the guide bar over the collar screw (3);

the head of the rear collar screw must pro‐ trude into the oblong hole

0458-738-0121-D 17

135BA011 KN

2310BA018 KN

142BA063 KN

001BA112 KN

English

► Guide the drive link into the bar groove (see

arrow) and turn the tensioning gear to the left as far as possible

► Fit chain sprocket cover, sliding the guide lugs

into the engine housing openings

8 Tensioning the Saw Chain (side chain tensioner)

8 Tensioning the Saw Chain

(side chain tensioner)

Retensioning during cutting work: ► Switch off the engine. ► Loosen the nut. ► Hold the bar nose up. ► Use a screwdriver to turn the tensioning

screw (1) clockwise until the chain fits snugly against the underside of the bar.

► While still holding the bar nose up, tighten

down the nut firmly.

► Go to "Checking Chain Tension".

A new chain has to be retensioned more often than one that has been in use for some time. ► Check chain tension frequently – see chapter

on "Operating Instructions".

9 Tensioning the Saw Chain

(quick chain tensioner)

When fitting the chain sprocket cover, the teeth of the adjusting wheel and the tensioning gear must mesh; if necessary, ► turn the adjusting wheel (4) a little until the

chain sprocket cover can be slid completely

against the engine housing ► Swing grip (5) into position (until it engages) ► Fit wing nut and tighten lightly ► Next step: see "Tensioning the Saw Chain"

18 0458-738-0121-D

Retensioning during cutting work: ► Shut off the engine. ► Pull out the hinged clip and loosen the wing‐

nut.

► Turn the adjusting wheel (1) clockwise as far

as stop. ► Tighten down the wingnut (2) firmly by hand. ► Fold down the hinged clip. ► Go to "Checking Chain Tension"

A new chain has to be retensioned more often than one that has been in use for some time.

142BA064 KN

10 Checking Chain Tension English

► Check chain tension frequently – see chapter

on "Operating Instructions".

10 Checking Chain Tension

► Shut off the engine. ► Wear work gloves to protect your hands. ► The chain must fit snugly against the under‐

side of the bar and it must still be possible to pull the chain along the bar by hand when the chain brake is released.

► If necessary, retension the chain.

A new chain has to be retensioned more often than one that has been in use for some time. ► Check chain tension frequently – see chapter

on "Operating Instructions".

11 Fuel

The engine requires a mixture of gasoline and engine oil.

WARNING

Avoid direct skin contact with fuel and breathing in of gasoline fumes.

11.1 STIHL MotoMix

STIHL recommends using STIHL MotoMix. This pre-blended fuel is free of benzene and lead, is distinguished by a high octane rating, and always provides the proper mixing ratio.

STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for optimum engine life.

MotoMix is not available in all markets.

11.2 Mixing fuel

NOTICE

Unsuitable fuels or a mixing ratio that deviates from the specification can lead to severe engine damage. The engine, seals, fuel lines and fuel tank may be damaged if low-quality gasoline or engine oil is used.

11.2.1 Gasoline

Use only high-quality gasoline with an octane rat‐ ing of at least 90 ROC – leaded or unleaded.

Gasoline with an alcohol component exceeding 10% can cause impaired engine performance in engines with manually adjustable carburetors and thus should not be used in these engines.

Engines with M-Tronic deliver full engine per‐ formance using gasoline with an alcohol compo‐ nent of up to 27% (E27).

11.2.2 Engine oil

If you mix the fuel yourself, use only STIHL twostroke engine oil or another high-performance engine oil classified as JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-LEGD.

STIHL specifies STIHL HP Ultra two-stroke engine oil or an equivalent high-performance engine oil in order to maintain emission limits over the machine’s service life.

11.2.3 Mixing ratio

with STIHL two-stroke engine oil 1:50; 1:50 = 1 part oil + 50 parts gasoline

11.2.4 Examples

Quantity of gaso‐ line Liters Liters (ml) 1 0.02 (20) 5 0.10 (100) 10 0.20 (200) 15 0.30 (300) 20 0.40 (400) 25 0.50 (500)

► Pour oil into an approved safety fuel canister

first, then add gasoline and mix thoroughly

STIHL two-stroke engine oil 1:50

11.3 Storing fuel mixture

Store in approved safety fuel canisters only in a dry, cool and secure place protected against light and sunlight.

0458-738-0121-D 19

001BA229 KN

001BA236 KN

001BA232 KN

001BA234 KN

001BA237 KN

English 12 Fueling

Fuel mixture deteriorates with age – mix only as

12.2 Opening

much as needed for a few weeks. Do not store fuel mixture for longer than 30 days. The fuel mixture can become unusable more quickly if exposed to light, sunlight or low or high tempera‐ tures.

STIHL MotoMix however can be stored for up to 5 years without any problems. ► Shake the canister containing the fuel mixture

thoroughly before refueling

WARNING

Pressure may have built up in the canister – open it carefully.

► The fuel tank and the canister in which fuel

mixture is stored should be cleaned thoroughly from time to time

Residual fuel and the liquid used for cleaning must be disposed of in accordance with regula‐ tions and without harming the environment!

12 Fueling

12.1 Preparing the machine

► Before fueling, clean the cap and the area

around it to ensure that no dirt falls into the fuel tank

► Always position the machine so that the cap is

facing upwards

► Raise grip to vertical position.

► Turn the cap counterclockwise (about a quar‐

ter turn).

Marks on tank cap and fuel tank must line up.

► Remove the tank cap.

20 0458-738-0121-D

001BA234 KN

001BA233 KN

001BA231 KN

001BA235 KN

001BA241 KN

001BA238 KN

12 Fueling English

12.3 Filling Up with Fuel

Take care not to spill fuel while fueling and do not overfill the tank.

STIHL recommends you use the STIHL filler noz‐ zle for fuel (special accessory). ► Fill the fuel tank.

12.4 Closing

► Fold the grip down.

Grip must be vertical: ► Fit the cap – marks on tank cap and fuel tank

must line up.

► Press the cap down as far as stop.

Tank cap is locked.

12.5 If the tank cap cannot be

locked in the fuel tank opening

Bottom of cap is twisted in relation to top. ► Remove the cap from the fuel tank and check

it from above.

► While holding the cap depressed, turn it clock‐

wise until it engages in position.

Left: Bottom of cap is twisted – inner

mark (1) in line with outer mark.

Right: Bottom of cap in correct position –

inner mark is under the grip. It is not in line with the outer mark.

The marks on the tank cap and fuel tank are then in alignment.

0458-738-0121-D 21

001BA239 KN

001BA158 KN

English 13 Chain Lubricant

WARNING

Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.

NOTICE

Waste oil does not have the necessary lubricat‐ ing properties and is unsuitable for chain lubrica‐

► Place the cap on the opening and rotate it

counterclockwise until it engages the filler neck.

► Continue rotating the cap counterclockwise

(about a quarter turn) – this causes the bottom of the cap to be turned to the correct position.

► Turn the cap clockwise and lock it in position –

see section on "Closing".

tion.

14 Filling Chain Oil Tank

14.1 Preparations

13 Chain Lubricant

For automatic and reliable lubrication of the chain and guide bar – use only an environmen‐ tally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is recom‐ mended.

NOTICE

Biological chain oil must be resistant to aging (e.g. STIHL BioPlus), since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive and chain. It may even cause the oil pump to seize.

The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formu‐ lated chain lubricant.

22 0458-738-0121-D

► Thoroughly clean the oil filler cap and the area

around it to ensure that no dirt falls into the

tank. ► Position the machine so that the filler cap is

facing up. ► Open the filler cap.

14.2 Fill up with chain oil.

► Refill the chain oil tank every time you refuel.

Take care not to spill chain oil while refilling and do not overfill the tank.

STIHL recommends you use the STIHL filler noz‐ zle for chain oil (special accessory). ► Close the filler cap.

There must still be a small amount of oil in the oil tank when the fuel tank is empty.

If the oil level in the tank does not go down, the reason may be a fault in the oil supply system: Check chain lubrication, clean the oilways, con‐ tact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ ized STIHL servicing dealer.

143BA024 KN

143BA011 KN

143BA012 KN

15 Checking Chain Lubrication English

15 Checking Chain Lubrica‐

tion

The saw chain must always spin off a small amount of oil.

NOTICE

Never operate your machine without chain lubri‐ cation. If the saw chain runs dry, the cutting attachment may very quickly be damaged beyond repair. Before starting work, always check the chain lubrication and oil level in the tank.

Every new saw chain needs a run-in time of 2 to 3 minutes.

After the saw chain has run in, check the tension of the chain and correct if necessary – see "Checking the chain tension".

16 Chain Brake

16.1 Saw chain, lock

in an emergency

–

when starting

–

when idling

–

Press the hand guard towards the nose of the guide bar with the left hand - or automatically

due to kickback: Saw chain is blocked - and stops running.

16.2 Disengage the chain brake.

► Pull the hand guard back towards the front

handle.

NOTICE

The chain brake must be released before open‐ ing the throttle (except during functional check‐ out) and before sawing.

Running the engine at high revs with the chain brake engaged (chain locked) will quickly dam‐ age the engine and chain drive (clutch, chain brake).

The chain brake is also activated by the inertia of the front hand guard if the kickback force of the saw is high enough: The hand guard is acceler‐ ated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during felling cut.

The chain brake will operate only if the hand guard has not been modified in any way.

16.3 Checking Operation of the

Chain Brake

Before starting work: Run engine at idle speed, engage the chain brake (push hand guard towards bar nose) and open the throttle wide for (no more than 3 seconds) – the chain must not rotate. The hand guard must be free of dirt and easily moveable.

16.4 Chain Brake Maintenance

The chain brake is subject to (normal wear). It is necessary to have it serviced and maintained regularly by trained personnel. STIHL recom‐ mends that maintenance and repair work be car‐ ried out only by authorised STIHL dealers. The following intervals must be complied with:

Full-time use: quarterly

0458-738-0121-D 23

2410BA012 KN

2410BA013 KN

2410BA014 KN

241BA015 KN

English 17 Winter Operation

Part-time use: every six months occasional use: annually

17 Winter Operation

17.1 Pre-heating carburetor

► Remove the shroud – see "Shroud"

17.1.1 At temperatures below +10 °C

► Using a screwdriver, pry the shutter out of

the s (summer operation) position

kit" (special accessory). The mounting kit keeps out powdered or drifting snow. ► If the chain saw is extremely cold (frost forma‐

tion) – after starting, bring the engine up to

operating temperature at medium speed (dis‐

engage chain brake!)

17.3 Mounting the cover plate (spe‐

cial accessory)

► Insert cover plate (1) with both tabs (arrows)

and fasten with screws (2)

When the mounting kit is used, the shutter must be in the winter position.

If engine trouble occurs, first check whether use of the cover plate is necessary.

18 Electric Handle Heating

18.1 Switching on the handle heat‐

ing system (depending on

► Place the shutter with the opening in the direc‐

tion of the chain saw in the r position (winter operation) – shutter must audibly snap into place

► Fit the shroud – see "Shroud"

Heated air is now drawn in from around the cylin‐ der and circulates around the carburetor – this helps prevent carburetor icing.

17.1.2 At temperatures above +20 °C ► Ensure that the shutter is always returned to

position s (summer operation), otherwise the engine may malfunction due to overheating

►

17.2 At temperatures below -10 °C

Under extreme winter conditions (temperatures below -10 °C, powdered or drifting snow), it is recommended to use the "cover plate mounting

24 0458-738-0121-D

Overheating during continuous use is impossible. The heating system is maintenance-free.

equipment version)

Set switch to F – to switch off, return switch to

the 0 position

1166BA025 AM

2410BA025 KN

19 Starting / Stopping the Engine English

19 Starting / Stopping the

Engine

19.1 Positions of Master Control Lever

STOP or † – Master Control lever must be pushed in direction of STOP or † to switch off ignition. The Master Control lever springs back to the run position F when it is released.

The Master Control lever moves from the start position (}) to the run position (F) when you press down the throttle trigger lockout and squeeze the throttle trigger at the same time.

To switch off the engine, move the Master Con‐ trol lever in the direction of STOP or † – when released, the Master Control lever springs back to the run position F.

19.3 Holding the Saw

There are two ways of holding the saw when starting.

19.3.1 On the ground

WARNING

The ignition is switched on again automatically after the engine stops. Engine can be started by operating the rewind starter.

Run position position or the engine runs in this position.

Start position } – a cold engine is started in this position.

F – a hot engine is started in this

19.2 Setting the Master Control Lever

To move the Master Control lever from the run position F to start }, depress the trigger lockout and the throttle trigger and hold them in that position – set the Master Control lever to start } and let go of the throttle trigger and trigger lock‐ out.

0458-738-0121-D 25

► Place your saw on the ground. Make sure you

have a firm footing – check that the chain is not touching any object or the ground.

► Hold the saw firmly on the ground with your

left hand on the front handle – your thumb should be under the handle.

► Put your right foot into the rear handle or your

right heel on the rear hand guard and press down.

2410BA002 KN

241BA003 KN

English 19 Starting / Stopping the Engine

19.3.2 Between knees or thighs

► Pull the starter grip slowly with your right hand

until you feel it engage – and then give it a brisk strong pull and push down the front han‐ dle at the same time. Do not pull out the starter rope to full length – it might otherwise break. Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.

Machines without additional manual fuel pump: If the engine is new or after a long out-of-service period or if the tank has been run dry (engine stops), it may be necessary to pull the starter rope several times to prime the fuel system.

19.4.1 Versions with ErgoStart

WARNING

This machine is extremely simple and easy to start, even for children – risk of accidents.

Do not allow children or other unauthorized per‐ sons to attempt to start or otherwise use the machine:

Never leave the machine unattended during

–

► Hold the rear handle tightly between your legs,

just above the knees.

► Hold the front handle firmly with your left hand

– your thumb should be under the handle.

19.4 Cranking

work breaks. After work, store the machine in a safe, secure

–

location.

The ErgoStart stores the energy 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.

There are two ways of starting with the Ergo‐ Start: ► Hold the starter grip with your right hand and

pull it out slowly and steadily – or – hold the starter grip with your right hand and give it several short pulls, using only a short length of rope for each pull.

► Push down the handle while cranking. Do not

pull out the rope to its full length – it might oth‐ erwise break.

► Do not let the starter grip snap back. Guide it

slowly back into the housing so that the starter rope can rewind properly.

26 0458-738-0121-D

2410BA020 KN

2410BA021 KN

0001BA039 KN

0001BA040 KN

STOP

19 Starting / Stopping the Engine English

19.5 Starting the Saw

WARNING

Bystanders must be well clear of the general work area of the saw.

19.5.1 Versions with manual fuel pump

► Press the manual fuel pump bulb at least five

times – even if the bulb is already filled with fuel.

19.5.2 Versions with decompression valve

► Press in the button to open the decompression

valve.

The decompression valve closes as soon as the engine fires. For this reason you must press in the button before each starting attempt.

19.5.3 All models

► Push the hand guard (1) forward – the chain is

locked.

The Master Control lever (4) is in the normal run position F. ► If the engine is cold: Press down the trigger

lockout (2) and pull the throttle trigger (3) at the same time. Hold both levers in that posi‐ tion and set the Master Control lever (4) to start symbol }.

► Hold your saw firmly. ► Pull the starter grip quickly and firmly as often

as necessary until the engine starts.

► If the engine does not start: Move the Master

Control lever (4) to start position } and repeat starting procedure.

19.6 As soon as the engine runs

0458-738-0121-D 27

001BA186 KN

0001BA041 KN

STOP

English 20 Operating Instructions

► If the engine was started in the start posi‐

tion }: Press down trigger lockout and the pull the throttle trigger (3) at the same time – the Master Control lever (4) moves to the run position (F) and the engine settles down to idling speed.

► Pull the hand guard back towards the front

handle.

The chain brake is now disengaged – your saw is ready for operation.

NOTICE

Always disengage chain brake before accelerat‐ ing the engine. High revs with the chain brake engaged (chain locked) will quickly damage the clutch and chain brake.

19.7 At very low outside tempera‐ tures

► Change over to winter operation if necessary –

see “Winter Operation”.

19.8 Stopping the Engine

► Check that the spark plug boot is properly con‐

nected.

► Repeat the starting procedure.

or:

It is possible that the fuel-air mixture in the com‐ bustion chamber is over-rich and has flooded the engine. ► Remove the spark plug – see "Spark Plug". ► Dry the spark plug. ► Hold the saw on the ground. ► Push the Master Control lever as far as stop in

direction of STOP or † and hold it there.

WARNING

An ignition spark may occur if the Master Control lever is not held against STOP or †.

► Operate the rewind starter several times. ► Release the Master Control lever – it springs

back to the run position F.

► Install the spark plug – see "Spark Plug". ► Hold and start your saw as described.

20 Operating Instructions

20.1 During the break-in period

A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessarily high loads dur‐ ing the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the shortblock are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.

20.2 During work

NOTICE

Open the throttle only when the chain brake is off. Running the engine at high revs with the chain brake engaged (chain locked) will quickly damage the engine and chain drive (clutch, chain brake).

20.2.1 Check chain tension frequently

► Move the Master Control lever in the direction

of STOP or † – when released, the Master Control lever springs back to the normal run position F.

19.9 If engine does not start

► Check that all settings are correct. ► Check that there is fuel in the tank and refuel if

necessary.

28 0458-738-0121-D

A new saw chain must be retensioned more fre‐ quently than one that has been in use already for an extended period.

20.2.2 Chain cold

Tension is correct when the chain fits snugly against the underside of the bar but can still be

001BA157 KN

143BA026 KN

21 Oil Quantity Control English

pulled along the bar by hand. Retension if neces‐ sary – see "Tensioning the Saw Chain".

20.2.3 Chain at operating temperature

The chain stretches and begins to sag. The drive links must not come out of the bar groove on the underside of the bar – the chain may otherwise jump off the bar. Retension the chain – see "Ten‐ sioning the Saw Chain".

NOTICE

The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

20.2.4 After a long period of full-throttle oper‐

ation

After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects engine-mounted com‐ ponents (ignition, carburetor) from thermal over‐ load.

20.3 After finishing work

► Slacken off the chain if you have retensioned it

at operating temperature during work.

NOTICE

The oil flow can be adjusted as needed using the adjusting screw (1) (on the bottom of the machine).

Ematic position (E), medium oil flow – ► Turn adjusting screw to E (Ematic position)

To increase oil flow – ► turn the adjusting screw clockwise

To reduce oil flow – ► turn the adjusting screw counterclockwise

NOTICE

The saw chain must always be coated with oil.

22 Taking Care of the Guide

Bar

Always slacken off the chain again after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

20.3.1 Short-term storage

Wait for engine to cool down. Keep the machine with a full tank of fuel in a dry place, well away from sources of ignition, until you need it again.

20.3.2 Long-term storage

See "Storing the machine"

21 Oil Quantity Control

Varying cutting lengths, types of wood and work techniques require varying amounts of oil.

0458-738-0121-D 29

► Turn the guide bar over – every time you

sharpen the chain and every time you replace the chain – this helps avoid one-sided wear, especially at the nose and underside of the bar.

► Regularly clean the oil inlet hole (1), the oil‐

way (2) and the bar groove (3)

► Measure the groove depth – with the scale on

the filing gauge (special accessory) – in the area used most for cutting

Chain type Chain pitch Minimum

groove

depth Picco 1/4" P 4.0 mm Rapid 1/4“ 4.0 mm Picco 3/8" P 5.0 mm

001BA199 KN

5902BA010 KN

5902BA011 KN

English 23 Shroud

Rapid 3/8“; 0.325“ 6.0 mm Rapid 0.404“ 7.0 mm

If groove depth is less than specified: ► Replace the guide bar

The drive link tangs will otherwise scrape along the bottom of the groove – the cutters and tie straps will not ride on the bar rails.

23 Shroud

23.1 Removing the Shroud

► To switch off the engine, move the Master

Control lever in the direction of STOP or † – when released, the Master Control lever springs back to the run position F.

► Push the hand guard forward – the chain is

locked.

► Open the twist locks (1) by turning them 1/4

turn counterclockwise with the combination wrench.

► Remove the shroud (2).

23.2 Installing the Shroud

► Place the shroud in position. ► Close the twist locks by turning them a 1/4

turn clockwise.

NOTICE

To avoid damaging the filter, do not use tools to remove or install the air filter.

► Rotate the air filter a 1/4 turn counterclockwise

and lift it away in the direction of the rear han‐ dle.

► Always replace damaged filters.

24.1.2 Cleaning the Air Filter ► Knock out the filter. ► Spray outside of filter with STIHL special

cleaner or soapy water.

► Rinse outside of filter under warm running

water.

NOTICE

Allow air filter to dry without using any external

–

source of heat. Do not impregnate the filter with oil.

–

► Allow air filter to dry. ► Install the air filter.

24.1.3 Installing the Air Filter

24 Cleaning the Air Filter

24.1 If There is a Noticeable Loss of Engine Power

► Remove the shroud – see "Shroud".

24.1.1 Removing the Air Filter

► Clean away loose dirt from around the filter.

► Place the air filter in position.

30 0458-738-0121-D

► Push the air filter towards the filter housing

and turn it clockwise at the same time until it engages – the "STIHL" name must be horizon‐ tal.

► Install the shroud – see "Shroud".

2410BA018 KN

000BA039 KN

000BA045 KN

25 M-Tronic English

25 M-Tronic

26.2 Checking the Spark Plug

25.1 Basic information

M-Tronic regulates the fuel quantity and ignition timing for all operating states electronically.

M‑Tronic stands for easy, fast starting, constant optimum engine performance, outstanding accel‐ eration and automatic adaptation to changes in operating conditions.

Manual carburetor adjustments are no longer required – the carburetor does not have any adjusting screws.

25.2 Automatic adjustment

Under extremely changed operating conditions, attainment of the optimal setting can be acceler‐ ated as follows: ► Carry out five uniform cuts to length under full

load

26 Spark Plug

► If the engine is down on power, difficult to start

or runs poorly at idle speed, first check the spark plug.

► Fit a new spark plug after about 100 operating

hours – or sooner if the electrodes are badly eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifica‐ tions".

► Clean dirty spark plug. ► Check electrode gap (A) and readjust if neces‐

sary – see "Specifications".

► Rectify the problems which have caused foul‐

ing of the spark plug.

Possible causes are:

Too much oil in fuel mix.

–

Dirty air filter.

–

Unfavorable running conditions.

–

26.1 Removing the spark plug

► Remove the shroud – see "Shroud"

WARNING

Arcing may occur if the adapter nut (1) is loose or missing. Working in an easily combustible or explosive atmosphere may cause a fire or an explosion. This can result result in serious inju‐ ries or damage to property.

► Use resistor type spark plugs with a properly

tightened adapter nut.

► Pull off the spark plug boot ► Unscrew spark plug

0458-738-0121-D 31

2410BA019 KN

001BA121 KN

001BA122 KN

English 27 Storing the Machine

26.3 Installing the spark plug

► Fit spark plug by hand ► Tighten the spark plug and press on the spark

plug boot firmly

► Fit the shroud – see "Shroud"

27 Storing the Machine

For periods of about 30 days or longer ► Drain and clean the fuel tank in a well-ventila‐

ted area.

► Dispose of fuel properly in accordance with

local environmental requirements.

► If a manual fuel pump is fitted: Press the man‐

ual fuel pump at least 5 times.

► Start the engine and run it at idling speed until

it stops.

► Remove saw chain and guide bar; clean and

spray with protective oil

► Thoroughly clean the machine - pay special

attention to the cylinder fins and air filter

► When using biological chain oil (e.g. STIHL

BioPlus), fill the lubricant oil tank

► Store the machine in a dry and secure location

Keep out of the reach of children and other unauthorized persons

28 Checking and Replacing

28.1 Fit new chain sprocket

after use of two saw chains or earlier

–

if the wear marks (arrows) are deeper than

–

0.5 mm – otherwise the service life of the saw chain is reduced – use check gauge (special accessory) to test

Using two saw chains in alternation helps pre‐ serve the chain sprocket.

STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake.

the Chain Sprocket

► Remove chain sprocket cover, saw chain and

guide bar.

► Release chain brake – pull hand guard against

the front handle

► Use a screwdriver to remove the E-clip (1) ► Remove the washer (2) ► Remove rim sprocket (3) ► Inspect transport profile on the clutch drum (4)

– if there are also heavy signs of wear, also replace the clutch drum

32 0458-738-0121-D

689BA027 KN

689BA021 KN

29 Maintaining and Sharpening the Saw Chain English

► Remove clutch drum or spur chain

sprocket (5) including needle cage (6) from the crankshaft – with QuickStop Super chain brake, press throttle trigger lockout before‐ hand

28.2 Install spur chain sprocket / rim sprocket

► Clean crankshaft stub and needle cage and

lubricate with STIHL lubricant (special acces‐

sory) ► Slide needle cage onto the crankshaft stub ► After refitting, turn the clutch drum and/or spur

chain sprocket approx. 1 full turn so that the

carrier for the oil pump drive engages – with

QuickStop Super chain brake, press throttle

trigger lockout beforehand ► Refit the rim sprocket – cavities toward the

outside ► Refit washer and E-clip on the crankshaft

WARNING

Compliance with the angles and dimensions lis‐ ted below is absolutely necessary. An improperly sharpened saw chain – especially depth gauges that are too low – can lead to increased kickback tendency of the chain saw – risk of injury!

29.2 Chain pitch

29 Maintaining and Sharpen‐

ing the Saw Chain

29.1 Sawing effortlessly with a prop‐

erly sharpened saw chain

A properly sharpened saw chain cuts through wood effortlessly even with very little pushing.

Never use a dull or damaged saw chain – this leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear. ► Clean the saw chain ► Check the saw chain for cracks and damaged

rivets ► Replace damaged or worn chain components

and adapt these parts to the remaining parts in

terms of shape and level of wear – rework

accordingly

Carbide-tipped (Duro) saw chains are especially wear-resistant. For an optimal sharpening result, STIHL recommends STIHL servicing dealers.

The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter.

Marking (a) Chain pitch Inches mm 7 1/4 P 6.35 1 or 1/4 1/4 6.35 6, P or PM 3/8 P 9.32 2 or 325 0.325 8.25 3 or 3/8 3/8 9.32 4 or 404 0.404 10.26

The diameter of file to be used depends on the chain pitch – see table "Sharpening tools".

The angles of the cutter must be maintained dur‐ ing resharpening.

29.3 Sharpening and side plate angles

A Sharpening angle

0458-738-0121-D 33

STIHL saw chains are sharpened with a 30° sharpening angle. Ripping chains, which are sharpened with a 10° sharpening angle, are

689BA025 KN

001BA203 KN

689BA018 KN

90°

689BA043 KN

English 29 Maintaining and Sharpening the Saw Chain

exceptions. Ripping chains have an X in the des‐ ignation.

B Side plate angle

The correct side plate angle results automatically when the specified file holder and file diameter are used.

Tooth shapes Angle (°) A B Micro = semi-chisel tooth, e. g., 63 PM3, 26 RM3, 36 RM Super = full chisel tooth, e. g., 63 PS3, 26 RS, 36 RS3 Ripping chain, e. g., 63 PMX, 36 RMX

The angles must be identical for all cutters in the saw chain. Varying angles: Rough, uneven run‐ ning of the saw chain, increased wear – even to the point of saw chain breakage.

30 75

30 60

10 75

29.4 File holder

ing sharpening and side plate angles, depth gauge setting, and tooth length, as well as clean‐ ing grooves and oil inlet holes.

29.6 Proper sharpening

► Select sharpening tools in accordance with

chain pitch ► Clamp guide bar if necessary ► Block saw chain – push the hand guard for‐

ward ► To advance the saw chain, pull the hand

guard toward the handlebar: The chain brake

is disengaged. With the Quickstop Super

chain brake system, additionally press the

throttle trigger lockout ► Sharpen frequently, removing little material –

two or three strokes of the file are usually suffi‐

cient for simple resharpening

► Use a file holder

Always use a file holder (special accessory, see table "Sharpening tools") when sharpening saw chains by hand. File holders have markings for the sharpening angle.

Use only special saw chain files! Other files are unsuitable in terms of shape and type of cutting.

29.5 To check the angles

STIHL filing gauge (special accessory, see table "Sharpening tools") – a universal tool for check‐

34 0458-738-0121-D

► Guide the file: horizontally (at a right angle to

the side surface of the guide bar) in accord‐

ance with the specified angle – according to

the markings on the file holder – rest the file

holder on the tooth head and the depth gauge ► File only from the inside outward ► The file only sharpens on the forward stroke –

lift the file on the backstroke ► Do not file tie straps and drive links ► Rotate the file a little periodically in order to

avoid uneven wear ► To remove file burr, use a piece of hardwood ► Check angle with file gauge

All cutters must be equally long.

689BA023 KN

689BA061 KN

689BA051 KN

689BA044 KN

29 Maintaining and Sharpening the Saw Chain English

With varying cutter lengths, the cutter heights also vary and cause rough running of the saw chain and chain breakage. ► All cutters must be filed down equal to the

length of the shortest cutter – ideally, one should have this done by a servicing dealer using an electric sharpener

29.7 Depth gauge setting

The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness.

a Required distance between depth gauge and

cutting edge

When cutting softwood outside of the frost sea‐ son, the distance can be increased by up to

0.2 mm (0.008").

Chain pitch Depth gauge Distance (a) Inches (mm) mm (Inches) 1/4 P (6.35) 0.45 (0.018) 1/4 (6.35) 0.65 (0.026) 3/8 P (9.32) 0.65 (0.026)

0.325 (8.25) 0.65 (0.026) 3/8 (9.32) 0.65 (0.026)

0.404 (10.26) 0.80 (0.031)

► Lay the appropriate file gauge (1) for the chain

pitch on the saw chain and press it against the

cutter to be checked – if the depth gauge pro‐

trudes past the file gauge, the depth gauge

must be reworked

Saw chains with humped drive link (2) – upper part of the humped drive link (2) (with service mark) is lowered at the same time as the depth gauge of the cutter.

WARNING

The rest of the humped drive link must not be filed; otherwise, this could increase the tendency of the chain saw to kick back.

► Rework the depth gauge so that it is flush with

the file gauge

29.8 Lowering the depth gauges

The depth gauge setting is lowered when the cutter is sharpened. ► Check the depth gauge setting after each

sharpening

► Afterwards, dress the leading edge of the

depth gauge parallel to the service mark (see

arrow) – when doing this, be careful not to fur‐

ther lower the highest point of the depth gauge

0458-738-0121-D 35

689BA052 KN

English 29 Maintaining and Sharpening the Saw Chain

WARNING

Depth gauges that are too low increase the kick‐ back tendency of the chain saw.

► Lay the file gauge on the saw chain – the high‐

est point of the depth gauge must be flush with the file gauge

► After sharpening, clean the saw chain thor‐

oughly, removing any filings or grinding dust – lubricate the saw chain thoroughly

► In the event of extended periods of disuse,

store saw chains in cleaned and oiled condi‐ tion

Sharpening tools (special accessories) Chain pitch Round file^Round file File holder File gauge Taper square

file

Sharpening

set

Inches (mm) mm (Inches)Part number Part number Part number Part number Part number

1/4P (6.35) 3.2 (1/8) 5605 771

3206

5605 750 4300

0000 893 4005

0814 252 3356

5605 007 1000

1/4 (6.35) 4.0 (5/32) 5605 772 40065605 750 43271110 893 40000814 252 33565605 007

1027

3/8 P (9.32) 4.0 (5/32) 5605 772

4006

0.325 (8.25) 4.8 (3/16) 5605 772 4806

3/8 (9.32) 5.2 (13/64) 5605 772

5206

0.404 (10.26) 5.5 (7/32) 5605 772 5506

consisting of file holder with round file, taper square file and file gauge

5605 750 4327 5605 750 4328 5605 750 4329 5605 750 4330

1110 893 4000 1110 893 4000 1110 893 4000 1106 893 4000

0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356

5605 007 1027 5605 007 1028 5605 007 1029 5605 007 1030

36 0458-738-0121-D

30 Maintenance and Care English

30 Maintenance and Care

The following information applies in normal operat‐ ing conditions. The specified intervals must be shortened accordingly when working for longer than normal or under difficult cutting conditions (extensive dust, highly resinous lumber, lumber from tropical trees, etc.). If you only use the tool occasionally, extend the intervals accordingly.

Weekly

Before starting work

Whenever tank is refilled

Monthly

If faulty

Annually

If damaged

As required

Complete machine Visual inspection (condi‐

X X

tion, leaks) Clean X

At the end of work and/or daily

Throttle trigger, throttle

Function test X X trigger lockout, choke lever, stop switch, master control lever (dependent on equipment)

Chain brake Function test X X

Have checked by

dealer Manual fuel pump (if

present)

Fuel pick-up body / filter in fuel tank

check X

Have repaired by a spe‐

cialist dealer

check X

Clean, replace filter

X X

insert

replace X X X Fuel tank Clean X Lubricating oil tank Clean X Chain lubrication check X Saw chain Check, pay attention to

X X

sharpness

Checking the chain ten‐

X X

sion

sharpen X Guide bar Check (wear, damage) X

Clean and turn over X

Deburr X

replace X X Chain sprocket check X Air filter Clean X X

replace X Anti-vibration elements check X X

Have replaced by serv‐

icing dealer

Air intake on fan housing Clean X X X Cylinder fins Clean X X X

0458-738-0121-D 37

English 31 Minimize Wear and Avoid Damage

Weekly

Before starting work

Whenever tank is refilled

Monthly

If faulty

Annually

If damaged

As required

Carburetor Check idle adjustment –

Spark plug Adjust electrode gap X

Accessible screws, nuts and bolts

Chain catcher check X

Safety information label replace X

STIHL recommends STIHL dealers

Firmly tighten down the cylinder base screws of chainsaws (3.4 kW or more) after 10 to 20 hours of

operation.

saw chain must not

rotate

If the saw chain contin‐

ues moving when the

engine is idling, have

your chainsaw checked

and repaired by your

dealer

Replace after 100 hours

of operation

Tighten

replace

31 Minimize Wear and Avoid

At the end of work and/or daily

X X

Consequential damages due to continued use

–

of a machine with defective components

Damage

Compliance with the specifications of this Instruction Manual will avoid excessive wear and damage to the machine.

The machine must be used, maintained and stored as carefully as described in this Instruc‐ tion Manual.

The user is responsible for all damage caused by failure to comply with the safety, operating and maintenance instructions. This applies in particu‐ lar for:

Product modifications not authorized by STIHL

–

Use of tools or accessories that are not

–

approved for the machine, unsuitable or of inferior quality Use of the machine in a manner not in keeping

–

with the intended use Use of the machine in sporting events or com‐

–

petitions

31.1 Maintenance work

All of the tasks listed under "Maintenance and Care" must be carried out periodically. If the user does not carry out these maintenance tasks himor herself, they should be delegated to a dealer.

STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers. STIHL dealers receive regular training and are supplied with technical information.

If these tasks are not performed or are per‐ formed improperly, this may result in damage for which the user is responsible. These include, among others:

Engine damage due to delayed or insufficient

–

maintenance (e. g., air and fuel filters) or insuf‐ ficient cleaning of the cooling air routing (air intake slits, cylinder fins)

38 0458-738-0121-D

2410BA026 KN

2, 3

32 Main Parts English

Corrosion damage and other consequential

–

damages due to improper storage Damage to the machine as a result of using

–

replacement parts of inferior quality

31.2 Parts Subject to Wear and Tear

Some parts of the power tool are subject to nor‐ mal wear and tear even during regular operation in accordance with instructions and, depending on the type and duration of use, have to be replaced in good time. Among other parts, this includes:

Saw chain, guide bar

–

Drive components (clutch, clutch drum, chain

–

sprocket) Filters (air, oil, fuel)

–

Starter mechanism

–

Spark plug

–

Components of antivibration system

–

32 Main Parts

5 Shutter (summer and winter operation)

6 Chain brake

7 Chain sprocket

8 Chain sprocket cover

9 Chain catcher

Side chain tensioner

11 Spiked bumper

12 Guide bar

13 Oilomatic chain

Adjusting wheel1) (quick chain adjuster)

Handle of wingnut

(quick chain adjuster)

16 Oil filler cap

17 Muffler

18 Front hand guard

19 Front handle (handlebar)

20 Spark plug boot

21 Starter grip

22 Fuel filler cap

23 Master Control lever

24 Throttle trigger

25 Throttle trigger lockout

26 Rear handle

27 Rear hand guard

# Serial number

33 Specifications

33.1 Engine

1 Shroud lock

Handle heating switch

Manual fuel pump

Decompression valve

Depending on model

to ISO 11681 +/- 50 rpm

0458-738-0121-D 39

STIHL single cylinder two-stroke engine

Displacement:

42.6 cc Bore: 42.5 mm Stroke: 30 mm Engine power to ISO 7293: 2.3 kW (3.1 bhp) at

Idle speed:

10,500 rpm 2,800 rpm

33.2 Ignition System

Electronic magneto ignition

Spark plug (resistor type): NGK CMR6H,

Electrode gap: 0.5 mm

BOSCH USR4AC

English 33 Specifications

33.3 Fuel System

All position diaphragm carburetor with integral fuel pump

Fuel tank capacity:

390 cc (0.39 l)

33.4 Chain Lubrication

Fully automatic, speed-controlled reciprocating oil pump. Additional manual oil flow control

Oil tank capacity:

250 cc (0.25 l)

33.5 Weight

dry, without bar and chain MS 241 C-M: 4.5 kg MS 241 C-M VW with handle and car‐ buretor heating: MS 241 C-BEM with ErgoStart and quick chain tensioner:

4.8 kg

4.9 kg

33.6 Cutting Attachment

Actual cutting length may be less than the speci‐ fied length

33.6.1 .325" Rollomatic E guide bars

Cutting lengths: 35, 40, 45 cm Pitch: .325" (8.25 mm) Groove width: 1.6 mm Nose sprocket: 11-tooth

33.6.2 3/8" P Rollomatic E guide bars

Cutting lengths: 30, 35, 40, 45 cm Pitch: 3/8" P (9.32 mm) Groove width: 1.3 mm Nose sprocket: 9-tooth

33.6.3 .325" chain

Rapid Micro 3 (26 RM3) Type 3634 Pitch: .325" (8.25 mm) Drive link gauge: 1.6 mm

33.6.4 3/8" P chain

Picco Super (63 PS) Type 3617 Picco Super 3 (63 PS3) Type 3616 Picco Duro 3 (63 PD3) Type 3612 Pitch: 3/8" P (9.32 mm) Drive link gauge: 1.3 mm

33.6.5 Chain sprocket

7-tooth for .325" Max. chain velocity to ISO 11681:

Chain speed at maximum power output: 6-tooth for 3/8" P Max. chain velocity to ISO 11681:

Chain speed at maximum power output:

25.6 m/s 19,3 m/s

24.8 m/s 18,6 m/s

33.7 Sound and Vibration Levels

For further details on compliance with Vibration Directive 2002/44/EC, see

www.stihl.com/vib

33.7.1 Sound pressure level L

ance with ISO 22868

103 dB(A)

33.7.2 Sound power level Lw in accordance

with ISO 22868

115 dB(A)

33.7.3 Vibration level a

with ISO 22867

Handle, left: Handle, right:

The K‑factor in accordance with Directive 2006/42/EC is 2.0 dB(A) for the sound pressure level and sound power level; the K‑factor in accordance with Directive 2006/42/EC is

2.0 m/s2 for the vibration level.

hv,eq

in accord‐

peq

in accordance

2.9 m/s

33.8 REACH

REACH is an EC regulation and stands for the Registration, Evaluation, Authorization and Restriction of Chemical substances.

For information on compliance with the REACH regulation (EC) No. 1907/2006 see

www.stihl.com/reach

33.9 Exhaust Emissions

The CO2 value measured in the EU type appro‐ val procedure is specified at

www.stihl.com/co2

in the product-specific technical data.

The measured CO2 value was determined on a representative engine in accordance with a

standardized test procedure under laboratory conditions and does not represent either an explicit or implied guarantee of the performance of a specific engine.

The applicable exhaust emission requirements are fulfilled by the intended usage and mainte‐ nance described in this User Manual. The oper‐ ating license shall be void if the engine is modi‐ fied in any way.

40 0458-738-0121-D

000BA073 KN

34 Ordering Spare Parts English

34 Ordering Spare Parts

Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make re-ordering simpler.

The guide bar and saw chain are subject to nor‐ mal wear and tear. When purchasing these parts, always quote the saw model, the part numbers and names of the parts.

Model

Serial number

Guide bar part number

Chain part number

35 Maintenance and Repairs

Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.

STIHL recommends that you have servicing and repair work carried out exclusively by an author‐ ized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.

When repairing the machine, only use replace‐ ment parts which have been approved by STIHL for this power tool or are technically identical. Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine.

STIHL recommends the use of original STIHL replacement parts.

Original STIHL parts can be identified by the STIHL part number, the { logo and the STIHL parts symbol K (the symbol may appear alone on small parts).

36 Disposal

Contact the local authorities or your STIHL serv‐ icing dealer for information on disposal.

Improper disposal can be harmful to health and pollute the environment.

► Take STIHL products including packaging to a

suitable collection point for recycling in accord‐ ance with local regulations.

► Do not dispose with domestic waste.

37 EC Declaration of Con‐

formity

ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen

Germany

declare in exclusive responsibility that the prod‐ uct

Category: Chain saw Make: STIHL Model: MS 241 C

Serial identification: 1143 Displacement

conforms to the relevant provisions of Directives 2006/42/EC, 2014/30/EU and 2000/14/EC and has been developed and manufactured in com‐ pliance with the following standards in the ver‐ sions valid on the date of production:

EN ISO 11681‑1, EN 55012, EN 61000‑6‑1

The measured and guaranteed sound power lev‐ els were determined according to Directive 2000/14/EC, Annex V, using the ISO 9207 standard.

Measured sound power level

115 dB(A)

Guaranteed sound power level

117 dB(A)

The EC type examination was carried out by

DPLF

MS 241 C-BEM MS 241 C-M MS 241 C-M VW MS 241 C-MQ

42.6 cm

0458-738-0121-D 41

English 38 UKCA Declaration of Conformity

Deutsche Prüf- und Zertifizierungsstelle für Landund Forsttechnik (NB 0363) Spremberger Straße 1 D-64823 Groß-Umstadt

Certification No. K-EG-2010/5607

Technical documents deposited at:

ANDREAS STIHL AG & Co. KG Produktzulassung (Product Licensing)

The year of manufacture and serial number are applied to the product.

Done at Waiblingen, 03.02.2020

ANDREAS STIHL AG & Co. KG

Dr. Jürgen Hoffmann

Director Product Certification & Regulatory Affairs

38 UKCA Declaration of Con‐

formity

ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen

Germany

declares under our sole responsibility that

Designation: Chainsaw Make: STIHL Series: MS 241 C MS 241 C-BEM MS 241 C-M MS 241 C-M VW MS 241 C-MQ Serial identification num‐ ber: Displacement

conforms to the relevant provisions of UK regula‐ tions The Restriction of the Use of Certain Haz‐ ardous Substances in Electrical and Electronic Equipment Regulations 2012, Supply of Machi‐ nery (Safety) Regulations 2008, Electromagnetic Compatibility Regulations 2016 and Noise Emis‐ sion in the Environment by Equipment for use Outdoors Regulations 2001 and has been manu‐ factured in compliance with the following stand‐

1143

42.6 cm

ards in the versions valid on the date of produc‐ tion:

EN ISO 11681‑1, EN 55012, EN 61000‑6‑1

The measured and guaranteed sound power lev‐ els have been determined in accordance with UK regulation Noise Emission in the Environment by Equipment for use Outdoors Regulations 2001, Annex 8, using the ISO 9207 standard.

Measured sound power level

115 dB(A)

Guaranteed sound power level

117 dB(A)

The type examination was carried out by

Intertek Testing & Certification Ltd, Academy Place, 1 – 9 Brook Street, Brentwood Essex, CM14 5NQ, United Kingdom

Certification No. ITS UK MCR 09

Technical documents deposited at:

ANDREAS STIHL AG & Co. KG

The year of manufacture and serial number are applied to the product.

Waiblingen, 31.03.2022

ANDREAS STIHL AG & Co. KG

Dr. Jürgen Hoffmann

Director Product Certification & Regulatory Affairs

42 0458-738-0121-D

38 UKCA Declaration of Conformity English

0458-738-0121-D 43

www.stihl.com

*04587380121D*

0458-738-0121-D

*04587380121D*

0458-738-0121-D

Stihl MS 241 C-M Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Guide to Using this Manual

1.1 Pictograms

2 Safety Precautions English

1.2 Symbols in text

1.3 Engineering improvements

2.1 General

2.2 Intended use

2.3 Clothing and Equipment

2.4 Transporting

2.5 Cleaning

2.6 Accessories

2.7 Refuelling

2.8 Before Starting Work

2.9 Starting the chain saw

2.10 During operation

2.11 After finishing work

2.12 Storage

2.13 Vibrations

2.14 Maintenance and repairs

3 Reactive Forces English

3.1 Dangers of kickback

3.2 Kickback occurs if, e. g.,

English 4 Working Techniques

3.3 Quickstop chain brake:

3.6 Pushback (B)

3.4 To reduce the risk of kickback

3.5 Pull-in (A)

3.7 Exercise extreme caution

4.1 Sawing

4.2 Preparing for felling

4.3 Felling notch

4.4 Sapwood cuts

4.5 Basic information on felling cut

4.6 Selecting the appropriate felling cut

4.7 Felling cut with stabilizing strap (normal tree)

4.8 Felling Cut with Holding Strap (Leaner)

5 Cutting Attachment English

5.1 Chain Scabbard

6.1 Removing the chain sprocket cover

English 7 Mounting the Bar and Chain (quick chain tensioner)

6.2 Disengage the chain brake.

7.1 Removing the chain sprocket cover

6.3 Fitting the chain

7.2 Mounting the tensioning gear

7.4 Fitting the saw chain

7.3 Releasing the chain brake

8 Tensioning the Saw Chain (side chain tensioner)

10 Checking Chain Tension English

11 Fuel

11.1 STIHL MotoMix

11.2 Mixing fuel

11.3 Storing fuel mixture

English 12 Fueling

12.2 Opening

12.1 Preparing the machine

12.3 Filling Up with Fuel

12.4 Closing

English 13 Chain Lubricant

14 Filling Chain Oil Tank

14.1 Preparations

14.2 Fill up with chain oil.

15 Checking Chain Lubrication English

16 Chain Brake

16.1 Saw chain, lock

16.2 Disengage the chain brake.

16.4 Chain Brake Maintenance

English 17 Winter Operation

17.1 Pre-heating carburetor

18 Electric Handle Heating

17.2 At temperatures below -10 °C

19 Starting / Stopping the Engine English

19.1 Positions of Master Control Lever

19.3 Holding the Saw

19.2 Setting the Master Control Lever

19.4 Cranking

19.5 Starting the Saw