Stihl MS 311, MS 391 Instruction Manual

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STIHL MS 311, 391

Instruction Manual2 - 39

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..................... 16

7 Tensioning the Chain................................ 16

8 Checking Chain Tension...........................17

9 Fuel........................................................... 17

10 Fueling...................................................... 18

11 Chain Lubricant.........................................20

12 Filling Chain Oil Tank................................20

13 Checking Chain Lubrication...................... 21

14 Chain Brake.............................................. 21

15 Winter Operation.......................................22

16 Starting / Stopping the Engine.................. 23

17 Operating Instructions...............................25

18 Oil Quantity Control...................................26

19 Taking Care of the Guide Bar................... 26

20 Cleaning the Air Filter............................... 27

21 Adjusting the Carburetor........................... 27

22 Spark Arresting Screen in Muffler............. 29

23 Spark Plug................................................ 29

24 Storing the Machine.................................. 30

25 Checking and Replacing the Chain

Sprocket....................................................30

26 Maintaining and Sharpening the Saw Chain

.................................................................. 31

27 Maintenance and Care..............................35

28 Main Parts.................................................37

29 Specifications............................................37

30 Ordering Spare Parts................................ 38

31 Maintenance and Repairs......................... 38

32 Disposal.................................................... 39

33 EC Declaration of Conformity................... 39

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

Original Instruction Manual

0000008281_006_GB

Printed on chlorine-free paper

Printing inks contain vegetable oils, paper can be recycled.

0458-542-8321-D. VA0.D21.

Actuate decompression valve

Actuate manual fuel pump

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2 Safety Precautions English

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.).

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

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English 2 Safety Precautions

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!

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

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2 Safety Precautions English

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.

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

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English 2 Safety Precautions

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 your machine is equipped with a cata‐ lytic converter.

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:

Hand protection (wearing warm gloves)

–

Work breaks

–

The period of usage is shortened by:

Any personal tendency to suffer from poor cir‐

–

culation (symptoms: frequently cold fingers, tingling sensations). Low outside temperatures.

–

The force with which the handles are held (a

–

tight grip restricts circulation).

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

2.14 Maintenance and repairs

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!

Exception: adjustment of carburettor and idle speed.

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001BA036 KN

001BA257 KN

3 Reactive Forces English

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

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English 4 Working Techniques

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

–

pinched in the cut.

3.3 Quickstop chain brake:

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

the chain pulls the saw forward – risk, always engage the spiked bumper securely in the tree or limb.

to reduce this

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

8 0458-542-8321-D

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

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4 Working Techniques

English

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

4.1 Sawing

chain saw in the vicinity of easily combustible materials, dry plants or scrub. It is mandatory that you ask the responsible forestry office about the current fire hazard.

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.

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.

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

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‐

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English 4 Working Techniques

erwise the cutting attachment may stick in the cut or kick back – risk of injury!

► 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:

4.2 Preparing for felling

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

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

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

Determining direction of fall and escape path

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

Pay special attention to the following points:

The natural inclination of the tree

–

Unusually heavy limb structure, asymmetrical

–

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

–

high winds Direction of slope

–

Neighboring trees

–

Snow load

–

Take the general condition of the tree into

–

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

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!

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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

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4 Working Techniques English

Clear escape paths, eliminate obstacles

–

Put down tools and equipment at a safe dis‐

–

tance – but not on the escape paths When felling, stand only to the side of the fall‐

–

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

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

–

slope When walking away along the escape path,

–

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

Preparing work area at base of tree

First clear the tree base and work area from

–

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

–

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

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

the bottom cut

Remove largest buttresses: first the largest

–

buttress – saw first vertically, then horizontally

Checking the direction of fall

– only if the tree is in sound condition

4.3 Felling notch

Preparing the felling notch

► Insert the chainsaw with guide bar in the bot‐

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 (C) determines the direction of

the felling notch.

fall.

Important:

Make a felling notch at right angle to direction

–

of fall Saw as close to the ground as possible

–

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

–

diameter of the trunk

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001BA259 KN

1/10

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English 4 Working Techniques

With rotten trunks, leave a wider strip

4.4 Sapwood cuts

–

Plunge cutting

For relieving cuts during shortening

–

For wood carving

–

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

► Use a low kickback saw chain and proceed

with special care

1.Begin cut by applying the lower portion of the guide bar nose – do not use upper portion because of risk of kickback. Cut at full strength until the depth of the kerf is twice the width of the guide bar2.Swing the machine slowly into the plunge cutting position – risk of kickback and pushback!3.Make the plunge cut very carefully. Risk of pushback.

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

–

12 0458-542-8321-D

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

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

Felling wedges

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

Only use aluminum or plastic wedges – do not use steel wedges. Steel wedges can seriously damage the saw chain and cause dangerous kickback.

001BA260 KN

001BA261 KN

001BA273 KN

001BA263 KN

4 Working Techniques English

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

► 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

–

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:

► 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

left: Normal tree – vertically upright tree

with uniform crown

right: Leaner tree - crown pointing in direc‐

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

tion of fall

4.7 Felling cut with stabilizing strap

(normal tree)

A) Thin trunks

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

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

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

► Tip of the guide bar must penetrate the wood

Shout a warning before starting the felling cut.

0458-542-8321-D 13

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

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

Do not cut into the hinge

–

► Make the felling cut up to the stabilizing

strap (3)

001BA274 KN

001BA265 KN

001BA266 KN

001BA267 KN

English 4 Working Techniques

Do not cut into the stabilizing strap

–

The felling cut must be continued on the oppo‐

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 as the first cut.

► Plunge cut the guide bar into the trunk until it

exits on the other side

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

Cut horizontally

–

Do not cut into the hinge

–

► Make the felling cut towards the holding strap

(2)

► Engage the spiked bumper behind the hinge

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

► Tip of the guide bar must penetrate the wood

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

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

14 0458-542-8321-D

001BA268 KN

001BA248 KN

001BA244 KN

001BA245 KN

5 Cutting Attachment English

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 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.

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.

Guide bars longer than 90 cm require one scab‐ bard extension. Guide bars longer than 120 cm require two scabbard extensions.

Depending on the model, the scabbard exten‐ sion either comes standard with the saw or is available as a special accessory.

5.2 Fitting Chain Scabbard Exten‐ sion

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.

► Push the scabbard extension and chain scab‐

bard together – the lugs (1) must engage in the chain scabbard.

0458-542-8321-D 15

143BA034 KN

001BA185 KN

001BA186 KN

143BA003 KN

001BA187 KN

133BA024 KN

English 6 Mounting the Bar and Chain

6 Mounting the Bar and

6.3 Fitting the chain

Chain

6.1 Removing the chain sprocket cover

WARNING

Wear work gloves to protect your hands from the

► Unscrew the nuts and take off the chain

sprocket cover.

sharp cutters.

► Fit the chain – start at the bar nose.

► Turn the screw (1) counterclockwise until the

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

6.2 Disengaging the chain brake.

► 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 sprocket (3) at the same time.

► 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 nuts

only fingertight.

► Go to chapter on "Tensioning the Saw Chain"

7 Tensioning the Chain

► Pull the hand guarad towards the front handle

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

16 0458-542-8321-D

143BA007 KN

8 Checking Chain Tension English

Retensioning during cutting work: ► Shut off the engine. ► Loosen the nuts. ► 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 nuts 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".

8 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.

► 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".

9 Fuel

Your engine requires a mixture of gasoline and engine oil.

WARNING

For health reasons, avoid direct skin contact with gasoline and avoid inhaling gasoline vapor.

9.1 STIHL MotoMix

STIHL recommends the use of STIHL MotoMix. This ready-to-use fuel mix contains no benzol or lead, has a high octane rating and ensures that you always use the right mix ratio.

STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for an extra long engine life.

MotoMix is not available in all markets.

9.2 Mixing Fuel

NOTICE

Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious dam‐ age to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank.

9.2.1 Gasoline

Use only high-quality brand-name gasoline with a minimum octane rating of 90 – leaded or unlea‐ ded.

Gasoline with an ethanol content of more than 10% can cause running problems in engines with a manually adjustable carburetor and should not be used in such engines.

Engines equipped with M-Tronic deliver full power when run on gasoline with an ethanol con‐ tent of up to 25% (E25).

9.2.2 Engine Oil

If you mix the fuel yourself, use only STIHL twostroke engine oil or another high-performance engine oil in accordance with 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.

9.2.3 Mix Ratio

STIHL 50:1 two-stroke engine oil: 50 parts gaso‐ line to 1 part oil

9.2.4 Examples

Gasoline STIHL engine oil 50:1 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)

► Use a canister approved for storing fuel. Pour

oil into canister first, then add gasoline and mix thoroughly.

0458-542-8321-D 17

001BA229 KN

001BA236 KN

001BA232 KN

001BA234 KN

001BA237 KN

English 10 Fueling

9.3 Storing Fuel

10.2 Opening

Store fuel only in approved safety-type fuel can‐ isters in a dry, cool and safe location protected from light and the sun.

Fuel mix ages – only mix sufficient fuel for a few weeks work. Do not store fuel mix for longer than 30 days. Exposure to light, the sun, low or high temperatures can quickly make the fuel mix unusable.

STIHL MotoMix may be stored for up to 2 years without any problems. ► Thoroughly shake the mixture in the canister

► Raise grip to vertical position.

before fueling your machine.

WARNING

Pressure may build up in the canister – open it carefully.

► Clean the fuel tank and canister from time to

time.

Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements.

10 Fueling

► Turn the cap counterclockwise (about a quar‐

ter turn).

10.1 Preparing the machine

Marks on tank cap and fuel tank must line up.

► 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

► Remove the tank cap.

18 0458-542-8321-D

001BA234 KN

001BA233 KN

001BA231 KN

001BA235 KN

001BA241 KN

001BA238 KN

10 Fueling English

10.3 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.

10.4 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.

10.5 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.

0458-542-8321-D 19

001BA239 KN

001BA158 KN

English 11 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.

12 Filling Chain Oil Tank

12.1 Preparations

11 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.

20 0458-542-8321-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.

12.2 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

13 Checking Chain Lubrication English

13 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".

14 Chain Brake

14.1 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.

14.2 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.

14.3 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.

14.4 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

0458-542-8321-D 21

4903BA002 KN

0001BA002 KN

0001BA003 KN

4903BA004 KN

English 15 Winter Operation

►

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

15 Winter Operation

15.1 Remove shroud

► Move the Master Control lever to the stop

position 0

► Push the hand guard forwards – the saw chain

is blocked

► Loosen screws (1) ► Remove the shroud (2)

15.2 Pre-heat carburetor

15.2.1 At temperatures below +10 °C

Place the slide in the position r (winter oper‐ ation) – r facing upwards

► Refit the shroud and tighten the screws

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

15.2.2 At temperatures above +20 °C

►

Ensure that the slide is set back to position s (summer operation) without fail, otherwise the engine may malfunction due to overheating

15.3 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 kit" (special accessory).

In case of erratic idling behavior or poor acceler‐ ation ► Turn the low speed screw (L) 1/4 turn counter‐

clockwise

Whenever the low speed screw (L) has been adjusted, it is usually also necessary to adjust the idle speed adjusting screw (LA), see "Setting the carburetor". ► if the chain saw is extremely cold (frost forma‐

tion) – after starting, bring the engine up to operating temperature at increased idle speed (disengage chain brake!)

15.4 Cover plate

The cover plate (special accessory) keeps out powdered or drifting snow.

When the cover plate is used, the slide must be in the winter position.

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

►

Pull the slide (1) out of the position s (sum‐ mer operation)

15.4.1 Attach cover plate

22 0458-542-8321-D

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

and fasten with the screws (2)

STOP

001BA140 KN

0001BA017 KN

0001BA018 KN

16 Starting / Stopping the Engine English

16 Starting / Stopping the

Engine

16.1 Positions of the Master Control lever

16.2.2

–

– –

Position starting acceleration n

if engine is warm (once the engine has been running for approx. one minute) when Engine Begins to Fire after ventilation of the combustion chamber, if the engine was flooded

16.3 Holding the Chain Saw

There are two methods of starting the saw.

16.3.1 On the ground

Stop 0 – engine off – the ignition is switched off Normal run position F – engine runs or can fire Starting throttle ( n ) – this position is used to

start a warm engine. The Master Control lever moves to the normal run position as soon as the throttle trigger is squeezed

Choke shutter closed (l) – this position is used to start a cold engine

16.2 Adjust Master Control lever

To move the Master Control lever from the nor‐ mal run position (F) to choke closed (l), press down the throttle lockout and squeeze the throt‐ tle trigger at the same time and hold them in that position – now set the Master Control lever.

To select the starting throttle position n, move the Master Control lever to choke closed l first, then push it into the starting throttle position n.

The Master Control lever must be in the choke closed position (n) before it can be moved to the starting throttle position (l).

The Master Control lever moves from the starting throttle position (n) to the normal run posi‐ tion (F) when you press down the throttle lockout and blip the throttle trigger at the same time.

To switch off the engine, set the master control lever to Stop 0.

16.2.1

– –

–

Position choke shutter closed l

if the engine is cold if the engine stalls during opening of throttle after starting if the fuel tank was run until empty (engine stopped)

► 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.

► place your right foot through the rear handle

16.3.2 Between knees

► clamp the rear handle between the knees or

thighs

► Hold the front handle firmly with your left hand

– your thumb should be under the handle.

0458-542-8321-D 23

0001BA019 KN

0001BA020 KN

0001BA021 KN

0001BA022 KN

STOP

English 16 Starting / Stopping the Engine

16.4 Actuating

► 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, it may be necessary to pull the starter rope several times to prime the fuel system.

16.5 Starting the Chainsaw

WARNING

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

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

locked.

► Press down the throttle trigger lockout (2) and

pull the throttle trigger (3) at the same time. Set Master Control lever (4) to:

Position choke shutter closed l

if engine is cold (even if the engine has stalled

–

during opening of throttle after starting)

Position starting acceleration n

if engine is warm (once the engine has been

–

running for approx. one minute)

► Hold and start your saw as described.

16.6 When Engine Begins to Fire

► Press the button, the decompression valve will

be opened

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

► Move the Master Control leve (1) to the posi‐

tion warm start n

► Press in button to open the decompression

valve

► Hold and start your saw as described.

24 0458-542-8321-D

0001BA023 KN

STOP

001BA186 KN

17 Operating Instructions English

16.7 As Soon As the Engine Runs

► Press down trigger lockout and the blip the

throttle trigger (2) – the Master Control lever (1) moves to the run position (F) and the engine settles down to idling speed

16.10 If Engine Does Not Start

The master control lever was not returned from the position choke shutter closed l to starting acceleration n in time, the engine may be floo‐ ded. ► Move the Master Control Lever to the stop

position 0 ► Remove the spark plug – see "Spark Plug". ► Dry the spark plug ► Crank the engine several times with the starter

to clear the combustion chamber. ► Refit the spark plug – see "Spark Plug". ► Set the master control lever to starting accel‐

eration n – even if the engine is cold ► Press in button to open the decompression

valve ► Restart the engine

17 Operating Instructions

17.1 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

► Pull the hand guard back towards the front

handle.

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

NOTICE

Open the throttle only when the chain brake is off. Increased engine speeds with the chain brake on (saw chain is stationary) will quickly damage the clutch and chain brake.

16.8 At Very Low Outside Tempera‐ tures

► Let the engine warm up briefly with the throttle

slightly open

► if necessary, configure for winter operation,

see "Winter Operation"

16.9 Shut off the engine

► Move the Master Control Lever to the stop

position 0

If the master control lever was moved from the position warm start n to stop 0 – afterwards simultaneously press the throttle trigger lockout and the throttle trigger.

this period. The engine develops its maximum power after about 5 to 15 tank fillings.

17.2 During work

NOTICE

Do not make the mixture leaner to achieve an apparent increase in power – this could damage the engine – see "Adjusting the Carburetor".

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 shortblock and chain drive (clutch, chain brake).

17.2.1 Check chain tension frequently

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

17.2.2 Chain cold

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

0458-542-8321-D 25

001BA157 KN

143BA026 KN

English 18 Oil Quantity Control

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

17.2.3 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.

17.2.4 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.

17.3 After finishing work

► Slacken off the chain if you have retensioned it

at operating temperature during work.

NOTICE

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.

Use the adjusting screw (1) (on underside of machine) to vary the oil feed rate as required.

Ematic position (E), medium oil flow rate – ► turn the adjusting screw to "E" (Ematic posi‐

tion).

To increase oil feed – ► turn the adjusting screw clockwise.

Turn reduce oil feed – ► turn the adjusting screw counterclockwise.

NOTICE

The chain must always be wetted with a film of lubricant.

19 Taking Care of the Guide

Bar

17.3.1 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.

17.3.2 Long-term storage

See "Storing the machine"

18 Oil Quantity Control

Adjustable flow oil pump is a special option.

Different quantities of oil are required for different bar lengths, types of wood and cutting techni‐ ques.

► 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

26 0458-542-8321-D

4903BA002 KN

2710BA000 KN

2710BA001 KN

20 Cleaning the Air Filter English

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

20 Cleaning the Air Filter

20.1 If there is a noticeable loss of engine power

20.1.1 Removing the shroud

► Move the Master Control lever to the stop

position (0).

► 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).

20.1.2 Removing the air filter

► Clean away loose dirt from around the filter.

NOTICE

To avoid damaging the filter, do not use tools for removing and installing 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 a damaged filter.

20.1.3 Cleaning the air filter ► Wash the filter in STIHL special cleaner (spe‐

cial accessory) or a clean, non-flammable sol‐ ution (e.g. warm soapy water). Rinse the filter from the inside outwards under a jet of water – do not use a pressure washer.

► Dry the filter components – do not expose to

high temperatures. ► Do not impregnate the filter with oil. ► Reinstall the air filter.

20.1.4 Installing the air filter

► Place the air filter in position. ► Push the air filter in the direction of the filter

housing and turn it clockwise at the same time

until it engages – the "STIHL" name must be

horizontal. ► Install the shroud.

21 Adjusting the Carburetor

21.1 General Information

The carburetor comes from the factory with a standard setting.

This setting provides an optimum fuel-air mixture under most operating conditions.

With this carburetor it is only possible to correct the adjusting screws within fine limits.

21.2 Preparations

► Shut off the engine. ► Check the air filter and clean or replace if nec‐

0458-542-8321-D 27

essary. ► Check the spark arresting screen (not in all

models, country-specific) in the muffler and

clean or replace if necessary.

0001BA026 KN

0001BA027 KN

0001BA028 KN

English 21 Adjusting the Carburetor

21.3 Different Standard Settings

These chain saws are equipped with carburetors that have different standard settings:

21.3.1 Standard setting A High speed screw (H) = 3/4

–

Low speed screw (L) = 1

–

21.3.2 Standard setting B High speed screw (H) = 3/4

–

Low speed screw (L) = 1/4

–

21.3.3 Determining standard setting

21.5 Standard Setting B

► Turn high speed screw (H) counterclockwise

as far as stop (no more than 3/4 turn).

► Turn the low speed screw (L) clockwise as far

as stop, then turn it back 1/4 turn.

21.6 Adjusting Idle Speed

► Carry out standard setting. ► Start and warm up the engine.

► Determine the required standard setting as fol‐

lows: Turn the low speed screw (L) carefully clockwise as far as stop, then turn it counter‐ clockwise.

Is range of adjustment more than 1 turn? ► Continue with

Is range of adjustment less than 1 turn? ► Continue with

21.4 Standard Setting A

"Standard setting A"

"Standard setting B"

21.6.1 Engine stops while idling ► Turn the idle speed screw (LA) clockwise until

the chain begins to run – then back it off 1 1/2 turns.

21.6.2 Saw chain runs while engine is idling ► Turn the idle speed screw (LA) counterclock‐

wise until the chain stops running – then turn it another 1 1/2 turns in the same direction.

WARNING

If the chain continues moving when the engine is idling, have your saw checked and repaired by

► Turn high speed screw (H) counterclockwise

as far as stop (no more than 3/4 turn).

► Turn the low speed screw (L) carefully clock‐

wise until it is against its seat, then turn it back 1 full turn

28 0458-542-8321-D

your servicing dealer.

21.6.3 Erratic engine idling speed; poor acceleration (even though low speed screw (L) = 1 in standard setting A or low speed screw (L) = 1/4 in standard setting B)

Idle setting is too lean

0001BA009 KN

4903BA002 KN

22 Spark Arresting Screen in Muffler English

► Turn the low speed screw (L) counterclock‐

wise until the engine runs and accelerates smoothly.

It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).

21.7 Fine Tuning for Operation at High Altitude

A slight correction of the setting may be neces‐ sary if the engine does not run satisfactorily: ► Carry out standard setting. ► Warm up the engine. ► Turn high speed screw (H) slightly clockwise

(leaner) – no further than stop.

NOTICE

After returning from high altitude, reset the car‐ buretor to the standard setting.

If the setting is too lean there is a risk of engine damage due to insufficient lubrication and over‐ heating.

22 Spark Arresting Screen in

Muffler

WARNING

To reduce the risk of fire caused by hot particles escaping from the machine, never operate the machine without a spark arresting screen, or with the spark arresting screen damaged. Do not modify the muffler or spark arresting screen. To reduce the risk of fire from accumulated debris such as pine needles, branches or leaves, ensure that the muffler plugs are in place before taking up work.

► Undo screw (1) ► Pull out the spark arresting screen (2) ► Clean the dirty spark arresting screen, replace

if damaged or heavily carbonized ► Refit the spark arresting screen ► Insert the screw ► If the muffler plugs are missing or damaged,

mount new plugs

23 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".

23.1 Remove the spark plug

► Move the Master Control lever to the stop

position 0 ► Push the hand guard forwards – the saw chain

is blocked

NOTICE

According to the law or regulations in some countries or federal states, certain operations may only be carried out if a properly serviced spark arresting screen is provided.

► If the engine is down on power, check the

spark arresting screen in the muffler

► Wait for the muffler to cool down

► Loosen screws (1) ► Remove the shroud (2)

0458-542-8321-D 29

4903BA007 KN

000BA039 KN

000BA045 KN

4903BA008 KN

English 24 Storing the Machine

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

23.3 Install spark plug

23.2 Checking the Spark Plug

► Screw in the spark plug and press on the

spark plug boot ► Refit the shroud and tighten the screws

► 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.

–

24 Storing the Machine

For periods of 3 months or longer ► Drain and clean the fuel tank in a well ventila‐

ted area. ► Dispose of fuel properly in accordance with

local environmental requirements. ► Run the engine until the carburetor is dry – this

helps prevent the carburetor diaphragms stick‐

ing together. ► Remove the saw chain and guide bar, clean

them and spray with corrosion inhibiting oil. ► Thoroughly clean the machine – pay special

attention to the cylinder fins and air filter. ► If you use a biological chain and bar lubricant,

e.g. STIHL BioPlus, completely fill the chain oil

tank. ► Store the machine in a dry, high or locked

location, out of the reach of children and other

unauthorized persons.

25 Checking and Replacing

the Chain Sprocket

► Remove chain sprocket cover, saw chain and

30 0458-542-8321-D

guide bar. ► Release chain brake – pull hand guard against

the front handle

001BA121 KN

001BA122 KN

26 Maintaining and Sharpening the Saw Chain English

25.1 Fit new chain sprocket

crankshaft – with QuickStop Super chain

brake, press throttle trigger lockout before‐

hand

25.2 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

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.

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

26 Maintaining and Sharpen‐

ing the Saw Chain

26.1 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.

► 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

► Remove clutch drum or spur chain

sprocket (5) including needle cage (6) from the

0458-542-8321-D 31

689BA027 KN

689BA021 KN

689BA025 KN

001BA203 KN

English

26 Maintaining and Sharpening the Saw Chain

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!

26.2 Chain pitch

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.

26.3 Sharpening and side plate angles

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

26.4 File holder

► 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.

26.5 To check the angles

A Sharpening angle

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

32 0458-542-8321-D

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

689BA018 KN

90°

689BA043 KN

689BA023 KN

689BA061 KN

26 Maintaining and Sharpening the Saw Chain English

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

26.6 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

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

26.7 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)

26.8 Lowering the depth gauges

► 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.

0458-542-8321-D 33

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

sharpening

689BA051 KN

689BA044 KN

689BA052 KN

English 26 Maintaining and Sharpening the Saw Chain

► 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

WARNING

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

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.

► 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

► Rework the depth gauge so that it is flush with

the file gauge

► 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

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

5605 750 4327

1110 893 4000

0814 252 3356

5605 007 1027

34 0458-542-8321-D

27 Maintenance and Care English

Sharpening tools (special accessories)

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

5605 750 4328 5605 750 4329 5605 750 4330

1110 893 4000 1110 893 4000 1106 893 4000

0814 252 3356 0814 252 3356 0814 252 3356

5605 007 1028 5605 007 1029 5605 007 1030

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

27 Maintenance and Care

The following maintenance intervals apply for normal operat‐ ing conditions only. When working under difficult conditions (high accumulation of dust, highly resinous lumber, lumber from tropical trees, etc.) or longer than normal each day, the specified intervals must be shortened accordingly. 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 (condition,

X X

leaks) Clean X

At the end of work and/or daily

Throttle trigger, throttle trigger

Function test X X 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) check X

Fuel pick-up body / filter in fuel tank

Have repaired by a specialist

dealer

check X

Clean, replace filter insert X X

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 tension X X

sharpen X Guide bar Check (wear, damage) X

Clean and turn over X

Deburr X

replace X X Chain sprocket check X

STIHL recommends STIHL servicing dealer

When using professional chainsaws (with a power output of 3.4 kW or more) for the first time,

tighten the cylinder block screws after 10 to 20 hours of operation

0458-542-8321-D 35

English 27 Maintenance and Care

Weekly

Monthly

If faulty

Annually

If damaged

Before starting work

Whenever tank is refilled

As required

Air filter Clean X X

At the end of work and/or daily

replace X Anti-vibration elements check X X

Have replaced by servicing

dealer

Air intake on fan housing Clean X X X Cylinder fins Clean X X Carburetor Check idle adjustment – saw

X X

chain must not rotate

Set the idle speed; if required

have the chainsaw repaired

by a specialist dealer

Spark plug Adjust electrode gap X

Replace after 100 hours of

operation Accessible screws and nuts

(except adjusting screws)

Spark arresting screen in muf‐ fler

Tighten

Check if installed X

Check or replace

Chain catcher check X

replace X Safety information label replace X

STIHL recommends STIHL servicing dealer

When using professional chainsaws (with a power output of 3.4 kW or more) for the first time,

tighten the cylinder block screws after 10 to 20 hours of operation

36 0458-542-8321-D

4903BA009 KN

28 Main Parts English

28 Main Parts

23 Rear handle

24 Rear hand guard

# Serial Number

29 Specifications

29.1 Engine

STIHL single cylinder two-stroke engine

29.1.1 MS 311

Displacement: Bore: 47 mm

Stroke: 34 mm Engine power to ISO 7293:

Idle speed:

29.1.2 MS 391

Displacement: Bore: 49 mm

Stroke: 34 mm Engine power to

1 Shroud lock

2 Carburetor adjusting screws

3 Spark plug boot

4 Shutter (summer and winter operation)

5 Decompression valve

6 Chain brake

7 Chain sprocket

8 Chain sprocket cover

ISO 7293: Idle speed:

29.2 Ignition System

Electronic magneto ignition

Spark plug (resistor type): Bosch WSR 6 F,

Electrode gap: 0.5 mm

29.3 Fuel System

All position diaphragm carburetor with integral fuel pump

Fuel tank capacity:

9 Chain catcher

10 Side chain tensioner

11 Spiked bumper

12 Guide bar

13 Oilomatic chain

14 Oil filler cap

15 Muffler (with Spark Arresting Screen, not

available in all markets)

16 Front hand guard

17 Front handle (handlebar)

18 Starter grip

19 Fuel filler cap

20 Master Control Lever

21 Throttle trigger

22 Throttle trigger lockout

to ISO 11681 +/- 50 rpm

0458-542-8321-D 37

29.4 Chain Lubrication

Fully automatic, speed-controlled oil pump with rotary piston. Additional manual oil flow control

Oil tank capacity:

29.5 Weight

Weight (dry, without bar and chain): MS 311: 6.2 kg MS 391: 6.2 kg

29.6 Cutting Attachment

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

29.6.1 Rollomatic E guide bars

Cutting lengths: 37, 40, 45 cm Pitch: 3/8" (9.32 mm)

59.0 cc

3.1 kW (4.2 bhp) at 9,500 rpm 2,800 rpm

64.1 cc

3.3 kW (4.5 bhp) at 9,500 rpm 2,800 rpm

NGK BPMR 7 A

600 cc (0.6 l)

350 cc (0.35 l)

English 30 Ordering Spare Parts

Groove width: 1.6 mm Nose sprocket: 10-tooth

29.6.2 3/8" chains

Rapid Micro (36 RM) Type 3652 Rapid Super (36 RS) Type 3621 Rapid Super 3 (36 RS3) Type 3626 Pitch: 3/8" (9,32 mm) Drive link gauge: 1.6 mm

29.6.3 Chain Sprockets

7-tooth for 3/8" (rim sprocket) Max. chain velocity to ISO 11681

Chain speed at maximum power:

27.5 m/s

21.7 m/s

29.7 Noise and Vibration Data

For further details on compliance with Vibration Directive 2002/44/EC see www.stihl.com/vib.

29.7.1

MS 311: 105 dB(A) MS 391: 105 dB(A)

29.7.2 Sound power level Lw to ISO 22868

MS 311: 117 dB(A) MS 391: 117 dB(A)

29.7.3 Vibration measurement a

Handle, left Handle,

MS 311: MS 391:

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.

Sound pressure level Lp to ISO 22868

ISO 22867

4.0 m/s

hv, eq

right

4.0 m/s

29.8 REACH

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

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

29.9 Exhaust Emissions

The CO2value measured in the EU type approval procedure is specified at www.stihl.com/co2.

The measured CO2value 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 instruction manual. The type approval expires if the engine is modified in any way.

30 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

31 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).

38 0458-542-8321-D

000BA073 KN

32 Disposal English

32 Disposal

Observe all country-specific waste disposal rules and regulations.

STIHL products must not be thrown in the gar‐ bage can. Take the product, accessories and packaging to an approved disposal site for envi‐ ronment-friendly recycling.

Contact your STIHL servicing dealer for the lat‐ est information on waste disposal.

33 EC Declaration of Con‐

formity

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

Germany

declare in exclusive responsibility that the prod‐ uct

Model: Chain Saw Make: STIHL Type: MS 311

Serial identification number: 1140 Displacement MS 311:

MS 391:

conforms to the provisions of Directives 2011/65/EU, 2006/42/EC, 2014/30/EU and 2000/14/EC and has been developed and manu‐ factured in compliance with the following stand‐ ards in the versions valid at the time of produc‐ tion:

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

The measured and guaranteed equivalent sound power level has been determined in accordance with Directive 2000/14/EC, Annex V, and stand‐ ard ISO 9207.

Measured sound power level

MS 311: 117 dB(A)

MS 391

59.0 cm

64.1 cm

MS 391: 117 dB(A)

Guaranteed sound power level

MS 311: 119 dB(A) MS 391: 119 dB(A)

The EC type approval test was carried out at the

DPLF Deutsche Prüf- und Zertifizierungsstelle für Landund Forsttechnik (NB 0363) Max-Eyth-Weg 1 D-64823 Groß-Umstadt

Certification No.: MS 311: K-EG-2009/5202 MS 391: K-EG-2009/5143

The technical documentation has been retained by:

ANDREAS STIHL AG & Co. KG Product approval

The year of construction and the serial number are shown on the machine.

Done at Waiblingen, 03.02.2020

ANDREAS STIHL AG & Co. KG

p p.

Dr. Jürgen Hoffmann

Head of Product Data, Regulations and Licens‐ ing

0458-542-8321-D 39

www.stihl.com

*04585428321D*

0458-542-8321-D

*04585428321D*

0458-542-8321-D

Stihl MS 311, MS 391 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

STIHL MS 311, 391

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

5 Cutting Attachment English

5.1 Chain Scabbard

English 6 Mounting the Bar and Chain

6.3 Fitting the chain

6.1 Removing the chain sprocket cover

6.2 Disengaging the chain brake.

7 Tensioning the Chain

8 Checking Chain Tension English

9 Fuel

9.1 STIHL MotoMix

9.2 Mixing Fuel

English 10 Fueling

9.3 Storing Fuel

10.2 Opening

10.1 Preparing the machine

10.3 Filling Up with Fuel

10.4 Closing

10.5 If the tank cap cannot be locked in the fuel tank opening

English 11 Chain Lubricant

12 Filling Chain Oil Tank

12.1 Preparations

12.2 Fill up with chain oil.

13 Checking Chain Lubrication English

14 Chain Brake

14.1 Saw chain, lock

14.2 Disengage the chain brake.

14.3 Checking Operation of the Chain Brake

14.4 Chain Brake Maintenance

English 15 Winter Operation

15.1 Remove shroud

15.2 Pre-heat carburetor

15.3 At temperatures below -10 °C

15.4 Cover plate

16 Starting / Stopping the Engine English

16.1 Positions of the Master Control lever

16.3 Holding the Chain Saw

16.2 Adjust Master Control lever

16.4 Actuating

16.5 Starting the Chainsaw

16.6 When Engine Begins to Fire

17 Operating Instructions English

16.7 As Soon As the Engine Runs