Stihl MS 260 Instruction Manual [en, fr]

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STIHL MS 260

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Contents

English

Guide to Using this Manual 2 Safety Precautions and Working

Techniques 2 Cutting Attachment 14 Mounting the Bar and Chain (side

chain tensioner) 14 Mounting the Bar and Chain (quick

chain tensioner) 15 Tensioning the Saw Chain (side

Original Instruction ManualPrinted on chlorine-free paper

chain tensioner) 17 Tensioning the Saw Chain (quick

chain tensioner) 18 Checking Chain Tension 18 Fuel 18 Fueling 19 Chain Lubricant 21 Filling Chain Oil Tank 21 Checking Chain Lubrication 22 Chain Brake 22 Winter Operation 23 Electric Handle Heating 24 Starting / Stopping the Engine 24 Operating Instructions 28

Printing inks contain vegetable oils, paper can be recycled.

Oil Quantity Control 29 Taking Care of the Guide Bar 29 Air Filter System 30 Cleaning the Air Filter 30 Engine Management 31 Adjusting the Carburetor 31 Spark Arresting Screen in Muffler 32 Spark Plug 33

Replacing the Starter Rope and Rewind Spring 34

Storing the Machine 35 Checking and Replacing the Chain

Sprocket 36 Maintaining and Sharpening the

Saw Chain 37 Maintenance and Care 40 Main Parts 42 Specifications 44 Special Accessories 45 Ordering Spare Parts 45 Maintenance and Repairs 46 Important Safety Instructions 46 Key to Symbols 48 STIHL Limited Emission Control

Warranty Statement 49 CSA Standard 51

Dear Customer, Thank you for choosing a quality

engineered STIHL product. This machine has been built using

modern production techniques and comprehensive quality assurance. Every effort has been made to ensure your satisfaction and troublefree use of the machine.

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

Your

Hans Peter Stihl

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0458-172-8221. M1.H10.DDS.

0000001679_002_GB

MS 260, MS 260 C

English

Guide to Using this Manual

Pictograms

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

Depending on the machine and equipment version, 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

Actuate manual fuel pump

Symbols in text

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

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

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 manual.

Safety Precautions and Working Techniques

Because a chain saw is a high-speed wood-cutting tool with very sharp cutters, some special safety precautions must be observed in addition to those that generally apply when working with an axe or hand saw.

It is important you read and understand the instruction manual before using your power tool for the first time and keep the manual in a safe place for future reference. Non-observance of the safety precautions may result in serious or even fatal injury.

Observe all applicable local safety regulations, standards and ordinances.

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

Minors should never be allowed to use a power tool.

Keep bystanders, especially children, and animals away from the work area.

When the power tool is not in use, shut it off so that it does not endanger others. Secure it against unauthorized use.

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

MS 260, MS 260 C

English

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

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

To operate the power tool 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 power tool.

Persons with pacemakers only: The ignition system of your power tool produces an electromagnetic 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 tool.

Do not operate the power tool 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). Use your saw for cutting wood or

wooden objects only. Do not use your power tool for any other

purpose since this may result in accidents.

Only use tools, guide bars, chains, chain sprockets and accessories that are explicitly approved for this power tool model by STIHL or are technically identical. If you have any questions in this respect, consult a servicing dealer.

Use only high quality parts and accessories in order to avoid the risk of accidents and damage to the machine.

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

Never attempt to modify your power tool in any way since this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorized attachments.

Do not use a pressure washer to clean the unit. The solid jet of water may damage parts of the unit.

Clothing and Equipment

Wear proper protective clothing and equipment.

Clothing must be sturdy but allow complete freedom of movement. Wear snug-fitting clothing with cut retardant inserts – an overall and jacket combination, do not wear a work coat.

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

Wear steel-toed safety boots with cut retardant inserts and non-slip soles.

Wear a safety hard hat where there is a danger of head injuries from falling objects.

Wear safety glasses or a face shield and hearing protection e.g. earplugs or ear muffs.

Wear heavy-duty gloves.

STIHL offers a comprehensive range of personal protective clothing and equipment.

Transporting the Chain Saw

Always engage the chain brake and fit the chain guard (scabbard) before carrying the saw short distances. Also stop the engine before carrying the saw longer distances (more than about 50 m).

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

Transporting in a vehicle: Properly secure your power tool to prevent turnover, fuel spillage and damage.

MS 260, MS 260 C

English

Fueling

Gasoline is an extremely flammable fuel. Keep clear of naked

flames. Do not spill any fuel – do not smoke.

Always shut off the engine before refueling.

Do not fuel a hot engine – fuel may spill and cause a fire.

Open the fuel cap carefully to allow any pressure build-up in the tank to release slowly and avoid fuel spillage.

Fuel your power tool only in wellventilated areas. If you spill fuel, wipe the machine immediately – if fuel gets on your clothing, change immediately.

Your power tool comes standard with either a screw-type or bayonet-type fuel cap.

After fueling, tighten down the screw-type fuel cap as securely as possible.

Insert the fuel cap with hinged grip (bayonet-type cap) correctly in the opening, turn it clockwise as far as stop and fold the grip down.

This reduces the risk of unit vibrations causing the fuel cap to loosen or come off and spill quantities of fuel.

Before starting

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

– Check operation of chain brake,

front hand guard

– Correctly mounted guide bar – Correctly tensioned chain – Smooth action of throttle trigger and

throttle trigger interlock – throttle trigger must return automatically to idle position.

– Master Control lever / stop switch

must move easily to STOP or 0

– 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 the safety devices in any way.

– Keep the handles dry and clean –

free from oil and pitch – for safe control of the chain saw.

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

Starting the engine

Start the engine at least 3 meters from the fueling spot, outdoors only.

Place the unit on firm ground in an open area. Make sure you have good balance and secure footing. Hold the unit securely. The cutting attachment must

be clear of the ground and all other obstructions because it may begin to run when the engine starts.

Your chain saw is designed to be operated by one person only. Do not allow other persons in the work area – even when starting.

To reduce risk of chain rotation and personal injury, lock the chain with the

chain brake before starting. Do not drop start your machine – the

correct starting procedure is described in the instruction manual.

Do not attempt to start the saw when the saw chain is in a cut.

Holding and Controlling the Power Tool

001BA087 LÄ

Always hold your saw firmly with both hands: Right hand on the rear handle,

even if you are left-handed. To ensure safe control, wrap your fingers tightly around the front and rear handles.

During Operation

Make sure you always have good balance and secure footing.

MS 260, MS 260 C

English

In the event of impending danger or in an emergency, switch off the engine immediately by moving the Master Control lever / stop switch to STOP or 0.

Your power tool is designed to be operated by one person only. Do not allow other persons in the work area.

Never leave a running machine unattended.

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

Take special care in slippery conditions – damp, snow, ice, on slopes, uneven ground and freshly debarked logs.

Watch out for obstacles such as tree stumps, roots and ditches which could cause you to trip or stumble.

Do not work alone – keep within calling distance of others in case help is needed.

Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.

To reduce the risk of accidents, take a break in good time to avoid tiredness or exhaustion.

To reduce risk of fire, keep hot exhaust gases and hot muffler away from easily combustible materials (e.g. wood chips, bark, dry grass, fuel). Mufflers with a catalytic converter can become particularly hot.

Your power tool produces toxic exhaust fumes as soon as the engine is running. These fumes may be colorless and odorless and contain unburned hydrocarbons and benzol. Never run the engine indoors or in poorly ventilated locations, even if your model is equipped with a catalytic converter.

To reduce the risk of serious or fatal injury from breathing toxic fumes, ensure proper ventilation when working in trenches, hollows or other confined locations.

To reduce the risk of accidents, stop work immediately in the event of nausea, headache, visual disturbances (e.g. reduced field of vision), problems with hearing, dizziness, deterioration in ability to concentrate. Apart from other possibilities, these symptoms may be caused by an excessively high concentration of exhaust gases in the work area.

The dusts (e.g. sawdust), vapor and smoke produced during operation may be dangerous to health. If dust levels are very high, wear a suitable respirator.

Check the saw chain at regular short intervals during operation or immediately if there is a noticeable change in cutting behavior:

– Shut off the engine and wait until the

chain comes to a complete stanstill.

– Check condition – Check sharpness.

Do not touch the chain while the engine is running. If the chain becomes jammed by an obstruction, switch off the engine immediately before attempting to remove the obstruction.

To reduce the risk of injury, shut off the engine before changing the saw chain.

To reduce the risk of fire, do not smoke while operating or standing near

your power tool. Note that combustible fuel vapor may escape from the fuel system.

If your power tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before Starting". Check the fuel system in particular for leaks and make sure the safety devices are working properly. Do not continue operating your power tool if it is damaged. In case of doubt, have the machine checked by your servicing dealer.

Make sure the idle speed setting is correct. The chain must not run when the engine is idling with the throttle trigger released. Check and correct the idle speed setting at regular intervals. If the saw chain still moves, have your dealer check your machine and make proper adjustments or repairs.

Reactive Forces

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

MS 260, MS 260 C

English

Dangers of kickback

Kickback can result in serious or fatal injury.

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

Kickback occurs, e.g.

– when the upper quadrant of the bar

nose unintentionally contacts wood or another solid object, e.g. when another limb is touched accidentally during limbing.

– when the chain at the nose of the

guide bar is pinched in the cut.

Quickstop chain brake:

This device reduces the risk of injury in certain situations – it cannot prevent kickback. If activated, the brake stops the saw chain within a fraction of a second – for a description of this device

001BA036 KN

refer to chapter on "Chain Brake" in this manual.

To reduce the risk of kickback – Work cautiously and avoid

situations which could cause kickback.

– Hold the saw firmly with both hands

and maintain 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 previous cut.

– Do not attempt plunge cuts if you

are not experience in this cutting

001BA093 LÄ

technique.

– Be alert for shifting of the log or

other forces that may cause the cut to close and pinch the chain.

– Always cut with a correctly

sharpened, properly tensioned chain – the depth gauge setting must not be too large.

– Use a low kickback chain and a

narrow radius guide bar.

Pull-in (A)

Pull-in occurs when the chain on the bottom of the bar is suddenly pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward – always hold the

spiked bumper securely against the tree or limb.

001BA037 KN

MS 260, MS 260 C

English

Pushback (B)

Pushback occurs when the chain on the top of the bar is suddenly pinched, caught or encounters a foreign object in the wood. The reaction of the chain drives the saw straight back toward the operator. To avoid pushback.

– Be alert to situations that may cause

the top of the guide bar to be pinched

– Do not twist the guide bar in the cut.

Exercise extreme caution – with leaners – with trees that have fallen

unfavorably between other trees and are under strain

– when working in blowdown areas. Do not work with the chainsaw in such

circumstances. Use block and tackle, cable winch or tractor.

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

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

When felling in the vicinity of roads, railways, power lines, etc., take extra

precautions. If necessary, inform the police, utility company or railway authority.

Cutting

Do not operate your saw with the

001BA038 KN

starting throttle lock engaged. Engine speed cannot be controlled with the throttle trigger in this position.

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

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

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.

To reduce the risk of injury, take special care when cutting shattered wood because of the risk of injury from slivers being caught and thrown in your direction.

Make sure your saw does not touch any foreign materials: Stones, nails, etc. may be flung off, damage the saw chain or cause the saw to kick back unexpectedly.

001BA082 KN

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

When working at heights:

– Always use a lift bucket – Never work on a ladder or in a tree – Never work on an insecure support – Do not work above shoulder height – Never operate your unit with one

hand

001BA033 KN

MS 260, MS 260 C

English

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

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

Note when reaching the end of a cut that the saw is no longer supported in the kerf. You have to take the full weight of the saw since it might otherwise go

out of control.

Felling

Do not attempt felling unless you have been trained in the necessary techniques. To reduce the risk of accidents and injury, do not attempt felling or limbing if you are not an experienced chain saw user.

Observe all country-specific regulations on felling techniques.

Check that there are no other persons in the felling area – other than helpers.

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

Determine direction of fall and escape paths

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

Pay special attention to the following points:

– The natural lean of the tree – Any unusually heavy limb structure,

damage

– The wind direction and speed – do

not fell in high winds

– Sloping ground – Neighboring trees – Snow load – Soundness of tree – take special

care if trunk is damaged or in case of deadwood (dry, decayed or rotted wood)

45°

B Escape paths – Establish paths of escape for

everyone concerned – opposite to direction of fall at about 45°.

– Remove all obstacles from escape

paths.

– Place all tools and equipment a safe

distance away from the tree, but not on the escape paths.

– Always keep to the side of the falling

tree and only walk away along the preplanned escape path.

– On steep slopes, plan escape

routes parallel to the slope.

– When walking away along the

escape path, watch out for falling limbs and watch the top of the tree.

Preparing work area at base of tree – First clear the tree base and work

area from interfering limbs and brush to provide a secure footing.

– Clean lower portion of tree base

(e.g. with an axe) – sand, stones and other foreign objects will dull the saw chain.

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

001BA088 LÄ

A Direction of fall

45°

– Remove large buttress roots: Make

001BA040 KN

the vertical cut first, then the horizontal – but only if the wood is sound

MS 260, MS 260 C

001BA146 KN

English

Felling notch

When making the felling notch, make use of the gunning sight on the shroud and fan housing to check the planned direction of fall.

Position your saw so that the gunning sight points in exactly the direction you want the tree to fall.

There are several approved methods for making the felling notch – observe country-specific regulations on felling techniques.

001BA153 KN

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

STIHL recommends the following method:

N Make the horizontal cut – check the

direction of fall with the gunning sight.

N Make angle cut at about 45°. N Check the felling notch and correct it

if necessary.

Important: – Felling notch at a right angle to the

planned direction of fall.

– As close to the ground as possible. – Cut to a depth of about 1/5 to 1/3 of

the trunk diameter.

Sapwood cuts

001BA143 KN

001BA150 KN

Sapwood cuts in long-fibered softwood help prevent sapwood splintering when the tree falls. Make cuts at both sides of the trunk at same height as bottom of felling notch to a depth of about 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.

MS 260, MS 260 C

English

Felling

Shout a warning before starting the felling cut.

N Make the felling cut (D) slightly

higher than bottom of the felling notch.

– Cut horizontally. – Leave approx. 1/10 of the tree

diameter uncut between the felling cut and the felling notch. This is the hinge.

Drive wedges into the felling cut in good time. Use only wooden, aluminum or plastic wedges. Never steel, which can damage the chain and cause kickback.

001BA144 KN

The hinge (E) helps control the falling tree.

– Do not cut through the hinge – you

could lose control of the direction of fall – this could result in an

accident.

– Leave a broader hinge on rotten

trees.

Shout a second warning immediately before the tree falls.

Small diameter trees: Simple fan cut

001BA145 KN

001BA147 KN

N Apply the spiked bumper behind the

hinge – pivot the saw around this point - only as far as the hinge. The spiked bumper rolls against the trunk.

MS 260, MS 260 C

Large diameter trees: Sectioning method

English

If the diameter of the tree is greater than the length of the guide bar, use the sectioning method.

1. First cut

Nose of guide bar should enter wood just behind the hinge – hold the saw horizontally and swing it as far as possible, using the bumper spike as a pivot – avoid repositioning the saw more than necessary.

2. When repositioning the saw for the

001BA148 KN

next cut, keep the guide bar fully engaged in the kerf to keep the felling cut straight – apply the spiked bumper again, and so on.

3. Insert a wedge (3) in the cut.

4. Last cut: Apply the spiked bumper

as for the simple fan cut – do not cut through the hinge.

Special cutting techniques

Plunge cuts and heartwood cuts require special training and experience.

Plunge cutting – For felling leaners – For relieving cuts during bucking – For DIY projects

N Use a low kickback chain and

exercise particular caution

1. Begin cut by applying the lower

portion of the guide bar nose – do not use upper portion because of – risk of kickback. Cut until depth of kerf is twice the width of the guide bar.

2. Swing saw slowly into plunge-

cutting position – take care because of the risk of kickback or

pushback.

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

Heartwood cut

– If tree diameter is more than twice

the length of the guide bar.

– If a large portion of heartwood

remains uncut on large diameter trees.

001BA179 KN

MS 260, MS 260 C

English

– On trees that are difficult to fell (oak,

beech), to prevent heartwood splintering and maintain planned direction of fall.

– On soft deciduous trees to relieve

tension in lying log and prevent slivers in the center of the hinge being torn out of the log.

N Make the plunge cut in the center of

the felling notch – there is a danger of pushback at this point – then swing the bar in the direction of the arrow.

Limbing

Do not attempt limbing unless you have been trained in the necessary techniques. To reduce the risk of accidents and injury, do not attempt felling or limbing if you are not an experienced chain saw user.

– Use a low kickback chain. – Work with the saw supported

wherever possible.

– 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.

When cutting small logs

– Use a sturdy and stable support –

sawhorse.

– Never hold the log with your leg or

foot.

– Never allow another person to hold

the log or help in any other way.

Lying or standing logs under tension

Always make cuts in the correct sequence (first at the compression side (1), then at the tension side (2), the saw may otherwise pinch or kick back– risk of injury.

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

Do not cut a lying log at a point where it is touching the ground because the saw chain will otherwise be damaged.

Ripping cut

001BA151 KN

Cutting technique in which the bumper spike is not used – risk of pull-in – start the cut with the guide bar at the shallowest possible angle – take extra care since there is an increased danger of kickback.

001BA152 KN

001BA189 KN

N Make relieving cut at the

compression side (1)

N Make bucking cut at the tension

side (2)

MS 260, MS 260 C

English

Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands ("white finger 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 circulation (symptoms: frequently cold fingers, tingling sensation)

– Low outside temperatures – Amount of gripping force (holding

the power tool tightly restricts circulation)

Users who use the machine periodically or for long periods or users who repeatedly experience corresponding symptoms (e.g., tingling sensation in fingers), should undergo a medical examination.

Maintenance and Repairs

Service the machine regularly. Do not attempt any maintenance or repair work not described in the instruction manual. Have all other work performed by a servicing dealer.

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

Only use high-quality replacement parts in order to avoid the risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.

STIHL recommends the use of genuine STIHL replacement parts. They are specifically designed to match your model and meet your performance requirements.

To reduce the risk of injury, always shut off the engine before carrying out any maintenance or repairs or cleaning the machine. – Exception: Carburetor and idle speed adjustments.

Do not turn the engine over on the starter with the spark plug boot or spark plug removed unless the slide control / stop switch is on STOP or 0 since there is otherwise a risk of fire from uncontained sparking.

To reduce the risk of fire, do not service or store your machine near open flames.

Check the fuel filler cap for leaks at regular intervals.

Use only a spark plug of the type approved by STIHL and make sure it is in good condition – see "Specifications".

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

Check the condition of the muffler.

To reduce the risk of fire and damage to hearing, do not operate your machine if the muffler is damaged or missing. –

Do not touch a hot muffler since burn injury will result.

Vibration behavior is influenced by the condition of the AV elements – check the AV elements at regular intervals.

Check the chain catcher and replace it if damaged.

Stopping the Engine – before checking chain tension. – before retensioning the chain. – before replacing the chain. – before rectifying problems. Observe sharpening instructions –

keep the chain and guide bar in good condition at all times for safe and correct handling of the saw. The chain must be properly sharpened, tensioned and well lubricated.

Always change the chain, guide bar and sprocket in good time.

Check condition of clutch drum periodically.

Store fuel and chain lubricant in properly labelled, safety-type canisters only. When handling gasoline, avoid direct contact with the skin and avoid inhaling fuel vapour – health risk.

To reduce the risk of injury, shut off the engine immediately if the chain brake malfunctions – contact your servicing dealer – do not use your power tool until the problem has been rectified (see "Chain Brake").

MS 260, MS 260 C

English

Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny coverage.

For any maintenance please refer to the maintenance chart and to the warranty statement near the end of the instruction manual.

Cutting Attachment

STIHL is the only manufacturer in the industry to produce its own chain saws, guide bars, saw chains and chain sprockets.

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.

t = a : 2

– The pitch (t) of the saw chain (1),

chain sprocket and the nose sprocket of the Rollomatic 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 cutting attachment may be damaged beyond repair after a short period of operation.

Mounting the Bar and Chain (side chain tensioner)

Removing the chain sprocket cover

N Unscrew the nuts and take off the

chain sprocket cover.

001BA191 KN

N Turn the screw (1)

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

143BA034 KN

001BA185 KN

MS 260, MS 260 C

English

Disengaging the chain brake.

N Pull the hand guarad towards the

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

Fitting the chain

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

N Fit the chain – start at the bar nose.

N Fit the guide bar over the studs (1) –

001BA186 KN

143BA003 KN

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

N Engage the peg of the tensioner

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

N 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.

N Refit the sprocket cover and screw

on the nuts only fingertight.

N Go to chapter on "Tensioning the

Saw Chain"

Mounting the Bar and Chain (quick chain tensioner)

Remove the chain sprocket cover.

001BA187 KN

N Pull out the hinged clip (1) so that it

snaps into position.

N Turn the wingnut (2)

counterclockwise until it hangs loose

N in the sprocket cover (3). N Removing the sprocket cover

133BA026 KN

MS 260, MS 260 C

English

Fitting the tensioning gear

N Remove the tensioning gear (1) and

turn it over.

N Unscrew the nut (2).

N Position the tensioning gear (1)

against the guide bar (3) so that the stud (4) projects through the upper hole and the short guide peg (5) locates in the lower hole.

N Screw the nut (2) on to the stud as

172BA007 KN

172BA008 KN

172BA009 KN

far as stop by hand.

Releasing the chain brake

N Pull the hand guarad towards the

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

Fitting the chain

172BA010 KN

Wear work gloves to protect your

001BA186 KN

hands from the sharp cutters.

N Fit the chain – start at the bar nose.

Pay attention to the position of the tensioning gear and the cutting edges.

N Turn the tensioning gear (1)

clockwise as far as stop.

N Turn the guide bar so that the

tensioning gear is facing you.

172BA011 KN

MS 260, MS 260 C

English

Tensioning the Saw Chain

(side chain tensioner)

N Fit the chain over the sprocket (2). N Fit guide bar in position – the collar

screw (3) engages the hole in the tensioning gear. The heads of the two short collar screws locate in the guide bar slot.

N Make sure the drive link tangs

engage the bar groove (see arrow) and then rotate the tensioning gear counterclockwise as far as stop.

172BA012 KN

When fitting the chain sprocket cover, check that the teeth of the tensioning gear and adjusting wheel mesh properly.

N If necessary, turn the adjusting

wheel (4) slightly until the sprocket cover can be pushed flush against the engine housing.

N Pull out the hinged clip (5) so that it

snaps into position.

N Engage wingnut and tighten it down

moderately.

N Go to chapter on "Tensioning the

Saw Chain"

172BA013 KN

172BA015 KN

Retensioning during cutting work:

N Shut off the engine. N Loosen the nuts. N Hold the bar nose up. N Use a screwdriver to turn the

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

N While still holding the bar nose up,

tighten down the nuts firmly.

N Go to "Checking Chain Tension". A new chain has to be retensioned more

often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

133BA024 KN

N Fit the chain sprocket cover so that

the wingnut locates on the collar screw (3).

MS 260, MS 260 C

172BA014 KN

English

Tensioning the Saw Chain (quick chain tensioner)

Retensioning during cutting work:

N Shut off the engine. N Pull out the hinged clip and loosen

the wingnut.

N Turn the adjusting wheel (1)

clockwise as far as stop.

N Tighten down the wingnut (2) firmly

by hand.

N Fold down the hinged clip. N Go to "Tensioning the Saw Chain"

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

N Check chain tension frequently –

see chapter on "Operating Instructions".

Checking Chain Tension

001BA112 KN

N Shut off the engine. N Wear work gloves to protect your

hands.

N The chain must fit snugly against

the underside of the bar and it must still be possible to pull the chain along the bar by hand.

N If necessary, retension the chain. A new chain has to be retensioned more

often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

Fuel

This engine is certified to operate on unleaded gasoline and with the mix ratio 50:1.

Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil.

Use premium branded unleaded gasoline with a minimum octane rating

143BA007 KN

of 89 RON. Note: Models equipped with a catalytic

converter require unleaded gasoline. A few tankfuls of leaded gasoline can reduce the efficiency of the catalytic converter by more than 50%.

Fuel with a lower octane rating may result in preignition (causing "pinging") which is accompanied by an increase in engine temperature. This, in turn, increases the risk of the piston seizure and damage to the engine.

The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines etc.), but magnesium castings as well. This could cause running problems or even damage the engine. For this reason it is essential that you use only high-quality fuels!

Fuels with different percentages of ethanol are being offered. Ethanol can affect the running behaviour of the engine and increase the risk of lean seizure.

Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke aircooled engine oils for mixing.

MS 260, MS 260 C

English

We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STIHL engines.

Do not use BIA or TCW (two-stroke water cooled) mix oils!

Use only STIHL 50:1 heavy-duty engine oil or an equivalent quality twostroke engine oil for the fuel mix in models equipped with a catalytic converter.

Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapour.

The canister should be kept tightly closed in order to avoid any moisture getting into the mixture.

The fuel tank and the canister in which fuel mix is stored should be cleaned from time to time.

Fuel mix ratio

Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved safety fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline.

Dispose of empty mixing-oil canisters only at authorized disposal locations.

Fueling

Preparations

001BA159 KN

N Before fueling, clean the filler cap

and the area around it to ensure that no dirt falls into the tank.

N Position the machine so that the

filler cap is facing up.

Opening the Cap

Examples

Gasoline Oil (STIHL 50:1 or equiva-

lent high-quality oils) 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)

MS 260, MS 260 C

001BA160 KN

N Swing the grip to the upright

position.

English

N Rotate the cap about 1/4 turn

counterclockwise.

N Remove the cap.

Fill up with fuel.

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

STIHL recommends you use the STIHL filler nozzle for fuel (special accessory).

Closing the Cap

001BA161 KN

N Fold the grip down so that it is flush

with the top of the cap.

If the grip does not lie completely flat on the cap and the grip's lug does not engage the recess (see arrow), the cap is not properly closed and you must repeat the above steps.

Changing the Fuel Pickup Body

N Drain the fuel tank. N Use a hook to pull the fuel pickup

body out of the tank and take it off the hose.

N Push the new pickup body into the

hose.

N Place the pickup body in the tank.

001BA163 KN

N Insert the cap in the opening – with

the grip upright – the marks must line up.

N Rotate the cap clockwise as far as

stop (about 1/4 turn).

001BA162 KN

165BA003 KN

Change the fuel pickup body every year:

MS 260, MS 260 C

English

Chain Lubricant

For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL Bioplus is recommended.

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

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

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

Filling Chain Oil Tank

Preparations

N Thoroughly clean the oil filler cap

and the area around it to ensure that no dirt falls into the tank.

N Position the machine so that the

filler cap is facing up.

N Open the filler cap.

Fill up with chain oil.

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, contact your dealer for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

001BA158 KN

Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.

MS 260, MS 260 C

N 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 nozzle for chain oil (special accessory).

N Close the filler cap. There must still be a small amount of oil

in the oil tank when the fuel tank is empty.

English

Checking Chain Lubrication

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

Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be irretrievably damaged within a very short time. Always check chain lubrication and the oil level in the tank before starting work.

Every new chain has to be broken in for about 2 to 3 minutes.

After breaking in the chain, check chain tension and adjust if necessary – see "Checking Chain Tension".

Chain Brake

Locking the chain

143BA024 KN

– in an emergency – when starting – at idling speed

The chain brake is activated by pushing the hand guard toward the bar nose with your left hand – or by inertia in certain kickback situations: The chain is stopped and locked.

Releasing the chain brake

N Pull the hand guard back toward the

front handle,

Always disengage chain brake before accelerating the engine (except when checking its

143BA011 KN

operation) and before starting cutting work.

High revs with the chain brake engaged (chain locked) will quickly damage the powerhead 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 accelerated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during felling cut.

143BA012 KN

MS 260, MS 260 C

English

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

Check operation of the chain brake

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

Chain brake maintenance

The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. Maintain the following servicing intervals:

Full-time usage: every 3

months

Part-time usage: every 6

months

Occasional usage: every 12

months

Winter Operation

At temperatures below +10°C

N Turn the lever above the rear handle

90° counterclockwise.

N Lift off the carburetor box cover

vertically.

N Pry the shutter (1) out of the

carburetor box cover.

N Slide the shutter into the slot (2) at

the bottom end of the carburetor box cover.

At temperatures above +20°C: Return shutter to the "summer" position. This is necessary to avoid engine running problems and overheating.

138BA005K

N Refit the carburetor box cover and

lock it with the lever.

Heated air is now drawn in from around the cylinder and mixed with cold air – this helps prevent carburetor icing.

At temperatures below -10°C

It is advisable to fit the intake air preheating kit (special accessory) if you use your saw in extremely cold conditions (temperatures below -10°C, in powder or drifting snow).

138BA006K

When fitted, the kit ensures that only heated air is drawn in from around the cylinder – this helps prevent air filter and carburetor icing.

The shutter for carburetor preheating must be in the "winter" position when the intake air preheating kit is fitted.

138BA007K

MS 260, MS 260 C

English

138BA012 LÄ

If your saw is very cold (frost or ice on machine), start the engine and keep it at a high idle speed (with chain brake disengaged) until it reaches normal operating temperature.

The air filter may load up faster when you use intake air preheating – clean it more frequently.

In the event of engine running problems, first check that the conditons for use of intake air preheating still apply.

Electric Handle Heating

Switching on the handle heating (depending on model).

N Move switch on front handle to F –

move switch back to 0 to switch off the heating.

There is no risk of overheating during long periods of operation. The heating system is maintenance-free.

Starting / Stopping the Engine

Positions of Master Control lever

STOP

001BA140 KN

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.

MS 260, MS 260 C

English

Setting the Master Control lever

To move the Master Control lever from the normal run position (F) to choke closed (l), press down the throttle interlock and squeeze the throttle 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 (l) before it can be moved to to the starting throttle position (n).

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

To switch off the engine, move the Master Control lever to Stop 0.

Choke shutter closed (l) – If the engine is cold – If the engine stalls when you open

the throttle after starting.

– If the fuel tank was run until empty

(engine stopped).

Starting throttle position (n) – If the engine is warm, i.e. if it has

been running for about one minute.

– When the engine begins to fire. – After clearing a flooded combustion

chamber.

Holding the saw

There are two ways of holding the saw when starting.

On the ground

N 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.

N Hold the saw firmly on the ground

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

N Put your right foot into the rear

handle and press down.

Between knees or thighs

N Hold the rear handle tightly between

your legs, just above the knees.

N Hold the front handle firmly with

143BA018 KN

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

143BA019 KN

MS 260, MS 260 C

English

Cranking

N 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 handle 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.

Starting the saw

Only models with decompression valve

143BA020 KN

N 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.

All Models

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

N Push the hand guard (1) forward –

the chain is locked.

N Press down the trigger interlock (2)

133BA001 K

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

Choke shutter closed (l) – If the engine is cold (also use this

position if the engine stopped when you opened the throttle after starting)

Starting throttle position (n) – If the engine is warm, i.e. if it has

been running for about one minute.

N Hold and start your saw as

described.

STOP

550BA001 SC

MS 260, MS 260 C

English

When the engine begins to fire:

STOP

N Set the Master Control lever (1) to

the starting throttle position ( n ).

N Press the button to open the

decompression valve (depending on model).

N Hold and start your saw as

described.

As soon as the engine runs

STOP

N Press down trigger interlock 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.

N Pull the hand guard back toward the

550BA002 SC

front handle.

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

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

At very low outside temperatures:

N Allow engine to warm up at part

throttle.

N Change over to winter operation if

necessary – see “Winter Operation”.

Shut off the engine

550BA003 SC

N Move the Master Control lever to the

stop position (0).

N Change over to winter operation if

necessary – see “Winter Operation”.

If the engine does not start

If you did not move the Master Control lever from the choke shutter closed position (l) to the starting throttle position (n) quickly enough, the engine may be flooded.

001BA186 KN

N Move the Master Control lever to the

stop position (0).

N Remove the spark plug – see

"Spark Plug".

N Dry the spark plug. N Crank the engine several times with

the starter to clear the combustion chamber.

N Refit the spark plug – see "Spark

Plug".

N Set Master Control lever to the

starting throttle position (n) – even if the engine is cold.

N Press the button to open the

decompression valve (depending on model).

N Now start the engine.

MS 260, MS 260 C

English

Operating Instructions

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 during 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.

During work

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

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).

Check chain tension frequently

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

Chain cold

Tension is correct when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand. Retension if necessary – see "Tensioning the Saw Chain".

Chain at operating temperature

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

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

After a long period of full-throttle operation

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 enginemounted components (ignition, carburetor) from thermal overload.

After finishing work

N Slacken off the chain if you have

retensioned it at operating temperature during work.

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.

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.

Long-term storage

See "Storing the machine"

MS 260, MS 260 C

+ 82 hidden pages

Stihl MS 260 Instruction Manual [en, fr]

Specifications and Main Features

Frequently Asked Questions

User Manual