STIHL MS 461 Owner's Manual

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STIHL MS 461

Instruction Manual

Manual de instrucciones

WARNING

This saw is capable of severe kickback

which may cause serious or fatal injury. Only for users with extraordinary cutting needs and experience and training dealing with kickback. Chainsaws with significantly reduced kickback potential are available. STIHL recommends the use of STIHL reduced kickback bar and low kickback chain.

ADVERTENCIA

Esta sierra es capaz de causar contragolpes severos, los cuales

pueden causar lesiones graves o mortales. Sólo es apta para usuarios con necesidades extraordinarias de corte y mucha experiencia y capacitación en el manejo de los contragolpes. Existen sierras con un potencial mucho menor de causar contragolpes. STIHL recomienda usar una barra y cadena de contragolpe reducido de STIHL.

Read and follow all safety precautions in Instruction Manual – improper use can cause serious or fatal injury.

Lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones – el uso incorrecto puede causar lesiones graves o mortales.

Instruction Manual 1 - 60

Manual de instrucciones 61 - 124

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Contents

Printing inks contain vegetable oils, paper can be recycled.

Printed on chlorine-free paper Original Instruction Manual

Guide to Using this Manual	2	Maintaining and Sharpening the
Safety Precautions and Working		Saw Chain
Techniques	3	Maintenance and Care
Cutting Attachment	23	Main Parts
Mounting the Bar and Chain	24	Specifications
Tensioning the Chain	25	Special Accessories
Checking Chain Tension	26	Ordering Spare Parts
Fuel	26	Maintenance and Repairs
Fueling	27	Disposal
Chain Lubricant	29	STIHL Incorporated Federal
Filling Chain Oil Tank	29	Emission Control Warranty
Checking Chain Lubrication	30	Statement
Chain Brake	30	Trademarks
Winter Operation	31
Electric Handle Heating	32
Starting / Stopping the Engine	33
Operating Instructions	36
Oil Quantity Control	37
Taking Care of the Guide Bar	38
Air Filter System	38
Remove air filter	39
Cleaning the Air Filter	39
Engine Management	40
Adjusting the Carburetor	40
Spark Arresting Screen in Muffler	41
Spark Plug	42
Replacing the Starter Rope and
Rewind Spring	43
Storing the Machine	45
Checking and Replacing the Chain
Sprocket	45

	Allowonlypersonswhofullyunderstand
46	this manual to operate your chain saw.
50	To receive maximum performance and
52	satisfaction from your STIHL chain saw,
54	it is important that you read, understand
56	and follow the safety precautions and
56	the operating and maintenance
56	instructions in chapter "Safety

56Precautions and Working Techniques"

57before using your chain saw. For further information you can go to www.stihlusa.com.

57	Contactyour STIHLdealer or theSTIHL
59	distributor for your area if you do not

understandanyoftheinstructionsinthis manual.

WARNING

Because a chain saw is a high-speed wood-cutting tool, some special safety precautions must be observed as with any other power saw to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.

MS 461

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Guide to Using this Manual

Pictograms

The meanings of the pictograms attached to or embossed on the machine are explained in this manual.

Dependingonthemodelconcerned,the following pictograms may be on your machine.

Fuel tank; fuel mixture of gasoline and engine oil

Chain oil tank; chain oil

Engaging and disengag- ing the STIHL Quickstop chain brake

Direction of chain rotation

Ematic; chain oil quantity control

Tension the chain

Intake air preheating for winter operation

Intake air for summer operation

Handle heating

Operate decompression valve

Operate manual fuel pump

Symbols in Text

Many operating and safety instructions are supported by illustrations.

The individual steps or procedures describedin themanualmaybemarked in different ways:

N A bullet marks a step or procedure.

A description of a step or procedure that refers directly to an illustration may contain item numbers that appear in the illustration. Example:

N Loosen the screw (1). N Lever (2) ...

In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:

DANGER

Indicates an imminent risk of severe or fatal injury.

WARNING

Indicates a hazardous situation which, if not avoided, could result in severe or fatal injury.

NOTICE

Indicates a risk of property damage, including damage to the machine or its individual components.

Engineering Improvements

STIHL’s philosophy is to continually improve all of its products. As a result, engineeringchangesandimprovements are made from time to time. Therefore, some changes, modifications and improvements may not be covered in this manual. If the operating characteristics or the appearance of your machine differs from those describedinthismanual,pleasecontact your STIHL dealer for assistance.

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Safety Precautions and

Working Techniques

Because a chain saw is a high-speed, fast-cutting power tool, special safety precautions must be observed to reduce the risk of personal injury.

It is important that you read, fully understand and observe the following safety precautions and warnings. Read the instruction manual and the safety instructions periodically. Careless or improper use may cause serious or fatal injury.

WARNING

Reactiveforces,including kickback,can be dangerous. Pay special attention to the section on reactive forces.

Have your STIHL dealer show you how to operate your power tool. All safety precautions that are generally observed when working with an ax or a hand saw also apply to the operation of chain saws. Observe all applicable federal, state and local safety regulations, standards and ordinances. When using a chain saw for logging purposes, for instance, refer to the OSHA regulations for "logging operations" at 29 Code of Federal Regulations 1910.266.

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WARNING

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.

WARNING

The use of this machine may be hazardous.The saw chain has many sharp cutters. If the cutters contact your flesh, they will cut you, even if the chain is not moving.

Use your chain saw only for cutting wooden objects.

WARNING

Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine.

WARNING

Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use.

WARNING

Toreducetheriskofinjurytobystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it.

Most of these safety precautions and warnings apply to the use of all STIHL chain saws. Different models may have different parts and controls. See the

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appropriate section of your instruction manual for a description of the controls and the function of the parts of your model.

Safe use of a chain saw involves 1 the operator

2the power tool

3 the use of the power tool.

THE OPERATOR

Physical Condition

You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued.

WARNING

Be alert – if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous.Ifyouhaveanyconditionthat mightbeaggravatedbystrenuouswork, check with your doctor before operating this machine.

WARNING

Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome.

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These conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.

All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factorsinthedevelopmentofwhitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:

–Most STIHL power tools are available with an anti-vibration ("AV") system designed to reduce the transmission of vibrations created by the machine to the operator's hands. An AV system is recommended for those persons using power tools on a regular or sustained basis.

–Wear gloves and keep your hands warm. Heated handles, which are available on some STIHL powerheads, are recommended for cold weather use.

–Keep the AV system well maintained. A power tool with loose components or with damaged or worn AV elements will tend to have higher vibration levels. Keep the

saw chain sharp. A dull chain will increase cutting time, and pressing a dull chain through wood will increase the vibrations transmitted to your hands.

–Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressure. Take frequent breaks.

All the above-mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore, continual and regular users should closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.

WARNING

The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with a pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.

Proper Clothing

WARNING

To reduce the risk of injury, the operator should wear proper protective apparel.

Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear long pants made of heavy material to help protect your legs from contact with branches or brush. To reduce the risk of cut injuries, wear pants or chaps that contain pads of cut retardant material. Avoid loose-fitting jack- ets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become caught on branches, brush or the moving parts of the unit. Secure hair so it is above shoulder level.

Good footing is very important. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended.

Wear an approved safety hard hat to reduce the risk of injury to your head. Chain saw noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to help protect your hearing. Continual and regular users should have their hearing checked regularly.

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

Never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top andsideprotectioncomplyingwithANSI Z 87.1 (or your applicable national standard). To reduce the risk of injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.

Always wear gloves when handling the machine and the cutting tool. Heavy-duty, nonslip gloves improve your grip and help to protect your hands.

THE POWER TOOL

For illustrations and definitions of the power tool parts see the chapter on "Main Parts."

WARNING

Nevermodifythispowertoolinanyway. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous.

If this 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 continuingwork.Checkinparticularthat

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the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. Incaseofdoubt,haveitcheckedbyyour STIHL servicing dealer.

THE USE OF THE POWER TOOL

Transporting the Power Tool

WARNING

To reduce the risk of injury from saw chain contact, never carry or transport your power tool with the saw chain moving. Always engage the chain brake when taking more than a few steps.

WARNING

Always switch off the engine, and fit the chain guard (scabbard) over the chain and guide bar before transporting the power tool over longer distances. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit.

001BA115 KN

It may be carried only in a horizontal position. Grip the front handle in a manner that the machine is balanced

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horizontally. Keep the hot muffler away from your body and the cutting attachment behind you.

Fuel

Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on "Fuel" of your instruction manual).

WARNING

Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and seri-

ous burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combusti- ble fuel vapor may escape from the fuel system.

Fueling Instructions

WARNING

Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the fuel tank depending on the fuel used, the weather conditions and the tank venting system.

In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap onyour power toolcarefullysoas to

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allow any pressure build-up in the tank torelease slowly. Neverremovethe fuel filler cap while the engine is running.

Selectbare groundforfuelingandmove at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine.

WARNING

Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately.

WARNING

Inordertoreducetheriskoffuelspillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.

Toolless cap with grip

001BA234 KN

To do this with this STIHL cap, raise the griponthetopofthecapuntilitisupright at a 90° angle. Insert the cap in the fuel tank with the positioning mark on the grip of the cap and the "open" mark on thefueltankopeningliningup.Usingthe grip, press the cap down firmly while turning it clockwise as far as it will go (approx. 1/4 turn). The positioning mark on the cap should now line up with the "cosed" mark on the tank.

Fold the grip flush with the top of the cap. Grip the cap and check for

tightness. If the grip does

not lie completely flush

with the cap and the detent on the grip does

not fit in the correspond-

ing recess in the filler opening, or if the cap is loose in the filler opening, the cap is not properly seated and tightened and you must repeat the above steps.

Misaligned, damaged or broken cap

NIfthecapdoesnotdropfullyintothe openingwhenthepositioningmarks line up and/or if the cap does not tighten properly when twisted, the baseofthecapmaybeprematurely

rotated (in relation to the top) to the closed position. Such misalignment can result from handling, cleaning or an improper attempt at tightening.

	1
	001BA238KN
Left:	Bottom of cap in closed posi-
	tion – inner mark (1) in line
	with outer mark.
Right:	Bottom of cap in correct posi-
	tion for installation – inner
	mark is under the grip and
	not in line with the outer
	mark.

001BA239 KN

NTo return the cap to the open position for installation, turn the cap (with the grip up) until it drops fully intothetankopening.Next,twistthe capcounterclockwiseasfarasitwill go (approx. 1/4 turn) – this will twist the base of the cap into the correct

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position for installation. Then, twist the cap clockwise, closing it normally.

NIf your cap still does not tighten properly, it may be damaged or broken; immediately stop use of the unit and take it to your authorized STIHL dealer for repair.

See also the "Fueling" chapter in your Instruction Manual for additional information.

Before Starting

Takeoffthechainguard(scabbard)and inspect the saw for proper condition and operation. (See the maintenance chart near the end of the instruction manual.)

WARNING

Alwayscheckyour power toolforproper condition and operation before starting, particularly the throttle trigger, throttle trigger lockout, stop switch and cutting tool. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices.

WARNING

Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely or securely assembled.

WARNING

Check that the spark plug boot is securely mounted on the spark plug – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.

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For proper assembly of the bar and chain follow the procedure described in the chapter "Mounting the Bar and Chain" of your instruction manual. STIHL Oilomatic chain, guide bar and sprocket must match each other in gauge and pitch. Before replacing any bar and chain, see the chapter entitled "Specifications" in the instruction manual and the section "Kickback" and the "ANSI B 175.1-2000 chain saw chain saw kickback standard" below.

WARNING

Proper tension of the chain is extremely important. In order to avoid improper setting, the tensioning procedure must be followed as described in your manual. Always make sure the hexagonal nut(s) for the sprocket cover is (are) tightened securely after tensioning the chain in order to secure the bar. Never start the saw with the sprocket cover loose. Check chain tension once more after having tightened the nut(s) and thereafter at regular intervals (whenever the saw is shut off). If the chain becomes loose while cutting, shut off the engine and then tighten. Never try to adjust the chain while the engine is running!

Keep the handles clean and dry at all times; it is particularly important to keep themfreeofmoisture,pitch,oil,fuelmix, grease or resin in order for you to maintain a firm grip and properly control your power tool.

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Starting

WARNING

To reduce the risk of fire and burn injuries, start the engine at least 10 feet (3 m) from the fueling spot, outdoors only.

Start and operate your saw without assistance. For specific starting instructions,seethe appropriate section oftheinstructionmanual.Properstarting methods reduce the risk of injury.

WARNING

To reduce the risk of injury from chain contact and / or reactive forces, the chain brake must be engaged when starting the saw.

WARNING

Do not drop start. This method is very dangerous because you may lose control of the saw.

There are two recommended methods for starting your chain saw.

001BA113 KN

Withthefirstrecommended method,the chain saw is started on the ground. Make sure the chain brake is engaged (see "Chain Brake" chapter in your instruction manual) and place the chain

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sawonfirmgroundorothersolidsurface in an open area. Maintain good balance and secure footing.

Gripthefronthandlebarofthesawfirmly with your left hand and press down. For saws with a rear handle level with the ground, put the toe of your right foot into the rear handle and press down. With your right hand pull out the starter grip slowlyuntilyou feela definite resistance and then give it a brisk, strong pull.

001BA114 KN

The second recommended method for starting your chain saw allows you to start the saw without placing it on the ground. Make sure the chain brake is engaged, grip the front handle of the chain saw firmly with your left hand.

Keep your arm on the front handle in a locked (straight) position. Hold the rear handle of the saw tightly between your legs just above the knees. Maintain good balance and secure footing. Pull the starting grip slowly with your right hand until you feel a definite resistance and then give it a brisk, strong pull.

WARNING

Be sure that the guide bar and chain are clear of you and all other obstructions andobjects,includingtheground.When the engine is started, the engine speed with the starting throttle lock engaged will be fast enough for the clutch to

engage the sprocket and, if the chain brake is not activated, turn the chain. If the upper quadrant of the tip of the bar touches any object, it may cause kickback to occur (see section on reactive forces). To reduce this risk, always engage the chain brake before starting. Never attempt to start the chain saw when the guide bar is in a cut or kerf.

As soon as the engine is running, immediately blip the throttle trigger, which will disengage the starting throttle lock and allow the engine to settle down to idle.

WARNING

When you pull the starter grip, do not wrap the starter rope around your hand. Do not let the grip snap back, but guide the starter rope to rewind it properly. Failure to follow this procedure may result in injury to your hand or fingers and may damage the starter mechanism.

Important Adjustments

WARNING

To reduce the risk of personal injury from loss of control and / or contact with the running cutting tool, do not use your unit with incorrect idle adjustment. At correct idle speed, the cutting tool should not move. For directions on how to adjustidlespeed,see the appropriate section of your instruction manual.

If you cannot set the correct idle speed, have your STIHL dealer check your power tool and make proper adjustments and repairs.

During Operation

Holding and Controlling the Power Tool

Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles.

001BA087 LÄ

Your right hand should grip the rear handle.Thisalsoappliestoleft-handers. Withyourhandsinthisposition,youcan best oppose and absorb the push, pull and kickback forces of your saw without losing control (see section on reactive forces).

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WARNING

To reduce the risk of serious or fatal injury to the opera-

tor or bystanders from loss of con- trol, never use the saw with one hand. It is more difficult for you to control reactive forces and to pre- vent the bar and chain from skating or bouncing along the limb or log. Even for those compact saws designed for use in confined spaces, onehanded operation is dangerous because the oper- ator may lose control.

WARNING

To reduce the risk of cut injuries, keep hands and feet away from the cutting tool. Never touch a moving cutting tool with your hand or any other part of your body.

WARNING

Keep proper footing and balance at all times. Special care must be taken in slippery conditions (wet ground, snow) andindifficult,overgrownterrain.Watch for hidden obstacles such as tree stumps, roots, rocks, holes and ditches

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to avoid stumbling. There is increased danger of slipping on freshly debarked logs.Forbetterfooting,clearawayfallen branches, scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.

WARNING

Take extreme care in wet and freezing weather (rain, snow, ice). Put off the work when the weather is windy, stormy or rainfall is heavy.

001BA031 KN

WARNING

To reduce the risk of injury from loss of control, never work on a ladder or any other insecure support. Never hold the machine above shoulder height. Do not overreach.

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WARNING

Never work in a tree unless you have received specific, professional training for such work, are properly secured (suchastackleandharnesssystemora lift bucket), have both hands free for operating the chain saw in a cramped environment and have taken proper precautions to avoid injury from falling limbs or branches.

001BA082 KN

Position the chain saw in such a way that your body is clear of the cutting attachment whenever the engine is running. Stand to the left of cut while bucking.

Never put pressure on the saw when reaching the end of a cut. The pressure may cause the bar and rotating chain to pop out of the cut or kerf, go out of control and strike the operator or some other object. If the rotating chain strikes some other object, a reactive force may cause the moving chain to strike the operator.

Working Conditions

Operate and start your power tool only outdoors in a well ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.

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WARNING

Your chain saw is a one-person machine. Do not allow other persons in the general work area, even when starting. Stop the engine immediately if you are approached.

WARNING

Even though bystanders should be kept away from the running saw, never work alone. Keep within calling distance of others in case help is needed.

WARNING

As soon as the engine is running, this product gen- erates toxic exhaust

fumes containing chemi- cals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that are known to cause respira- tory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be color- less and odorless. To reduce the risk of serious or fatal injury / illness from inhaling toxic fumes, never run the machine indoors or in poorly venti- lated locations. If exhaust fumes become concen- trated due to insufficient ventilation, clear obstruc- tions from work area to permit proper ventilation before proceeding and / or take frequent breaks to allow fumes to dissipate before they become concentrated.

WARNING

Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction.

Substantial or repeated inhalation of dustandotherairbornecontaminants,in particular those with a smaller particle size, may cause respiratory or other

illnesses. This includes wood dust, especially from hardwoods, but also from some softwoods such as Western Red Cedar. Control dust at the source where possible. Use good work practices, such as always cutting with a properly sharpened chain (which produces wood chips rather than fine dust) and operating the unit so that the wind or operating process directs any dust raised by the power tool away from the operator. Follow the recommendations of EPA / OSHA / NIOSH and occupational and trade associations with respect to dust ("particulate matter"). When the inhalation of dust cannot be substantially controlled, i.e., kept at or neartheambient(background)level,the operator and any bystanders should wear a respirator approved by NIOSH / MSHA for the type of dust encountered.

WARNING

Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos-containing products have been strictly regulated by OSHAandtheEnvironmentalProtection Agency. If you have any reason to believe that you might be cutting asbestos, immediately contact your employer or a local OSHA representative.

Operating Instructions

WARNING

Donotoperateyourpowertoolusingthe starting throttle lock, as you do not have control of the engine speed.

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In the event of an emergency, switch off the engineimmediately– movetheslide control / stop switch to 0 or STOP.

WARNING

Always stop the engine before putting a chain saw down.

WARNING

The saw chain continues to move for a short period after the throttle trigger is released (flywheel effect).

Accelerating the engine while the saw chain is blocked increases the load and willcausetheclutchtoslipcontinuously. This may occur if the throttle is depressed for more than a few seconds when the chain is pinched in the cut or the chain brake is engaged. It can result in overheating and damage to important components (e.g. clutch, polymer housing components) – which can then increase the risk of injury, e.g., from the saw chain moving while the engine is idling.

WARNING

Your chain saw is equipped with a chain catcher. It is designed to reduce the risk of personal injury in the event of a thrown or broken chain. From time to time, the catcher may be damaged or removed. To reduce the risk of personal injury, do not operate a chain saw with a damaged or missing chain catcher.

WARNING

Inspect antivibration elements periodically. Replace damaged, broken or excessively worn antivibration

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elements immediately, since they may result in loss of control of the saw. A "sponginess" in the feel of the saw, increased vibration or increased "bottoming" during normal operation may indicate damage, breakage or excessive wear. Antivibration elements shouldalwaysbereplacedinsets.Ifyou have any questions as to whether the antivibration elements should be replaced, consult your STIHL servicing dealer.

WARNING

Your saw is not designed for prying or shoveling away limbs, roots or other objects. Such use could damage the cutting attachment or AV system.

WARNING

When sawing, make sure that the saw chain does not touch any foreign materials such as rocks, fences, nails and the like. Such objects may be flung off, damage the saw chain or cause the saw to kickback.

WARNING

Never modify your muffler. Any modification could cause an increase in heat radiation, sparks or sound level, thereby increasing the risk of fire, burn injury or hearing loss. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only.

WARNING

Themufflerandotherpartsoftheengine (e.g. fins of the cylinder, spark plug) becomehotduringoperationandremain

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hot for a while after stopping the engine. Toreduceriskofburns,donottouchthe muffler and other parts while they are hot. Keep the area around the muffler clean. Remove excess lubricant and all debris such as pine needles, branches or leaves. Let the engine cool down sitting on concrete, metal, bare ground or solid wood (e.g. the trunk of a felled tree) away from any combustible substances.

WARNING

An improperly mounted or damaged cylinder housing or a damaged/deformed muffler shell may interfere with the cooling process of the muffler. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder housing or a damaged/deformed muffler shell.

Your muffler is furnished with a spark arresting screen designed to reduce the risk of fire from the emission of hot particles. Never operate your unit with a missing or damaged spark arresting screen.Ifyourgas/oilmixratioiscorrect (i.e., not too rich), this screen will normally stay clean as a result of the heat from the muffler and need no service or maintenance. If you experiencelossofperformanceandyou suspect a clogged screen, have your mufflermaintained byaSTIHL servicing dealer. Some state or federal laws or regulations may require a properly maintained spark arrestor for certain uses.Seethe"Maintenance,Repairand Storing" section of these Safety Precautions. Remember that the risk of a brush or forest fire is greater in hot or dry conditions.

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WARNING

Some STIHL power tools are equipped with a cata- lytic converter, which is

designed to reduce the exhaust emissions of the engine by a chemical process in the muffler. Due to this process, the muffler does not cool down as rapidly as con- ventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries when using a cat- alytic converter, always set your power tool down in the upright position and never locate it where the muffler is near dry brush, grass, wood chips or other combustible materi- als while it is still hot.

Reactive Forces including Kickback

WARNING

Reactive forces may occur any time the chain is rotating. Reactive forces can cause serious personal injury.

001BA093 LÄ

Thepowerfulforceusedtocutwoodcan be reversed and work against the operator.Iftherotatingchainissuddenly stopped by contact with any solid object suchasalogorbranchorispinched,the reactive forces may occur instantly. These reactive forces may result in loss of control, which, in turn, may cause serious or fatal injury. An understanding of the causes of these reactive forces may help you avoid the element of surprise and loss of control. Sudden surprise contributes to accidents.

The most common reactive forces are:

–kickback,

–pushback,

–pull-in. Kickback:

Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched.

001BA035 KN

The reaction of the cutting force of the chain causes a rotational force on the chainsawinthedirectionoppositetothe chain movement. This may fling the bar upandbackinalightningfastreactionin an uncontrolled arc mainly in the plane of the bar. Under some cutting circumstances the bar moves towards the operator, who may suffer severe or fatal injury.

Kickback may occur, for example, when thechainneartheupperquadrantofthe bar nose contacts the wood or is pinched during limbing or when it is incorrectly used to begin a plunge or boring cut.

The greater the force of the kickback reaction,themoredifficultitbecomesfor the operator to control the saw. Many factors influence the occurrence and force of the kickback reaction. These include chain speed, the speed at which

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the bar and chain contact the object, the angle of contact, the condition of the chain and other factors.

The type of bar and saw chain you use is an important factor in the occurrence andforceofthekickbackreaction.Some STIHLbarandchaintypesaredesigned to reduce kickback forces. STIHL recommends the use of reduced kickback bars and low kickback chains.

ANSI B 175.1-2000 chain saw kickback standard

§ 5.11 of ANSI standard B 175.1-2000, sets certain performance and design criteria related to chain saw kickback.

To comply with § 5.11 of ANSI B 175.1-2000:

a)Saws with a displacement of less than 3.8 cubic inches (62 cm³)

–must, in their original condition, meet a 45° computer derived kickback angle when equipped with certain cutting attachments,

–and must be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback chain, reduced kickback bar, etc.

b)Saws with a displacement of 3.8 cubic inches (62 cm³) and above

–must be equipped with at least one device designed to reduce the risk of kickback injury, such as a chain brake, low kickback chain, reduced kickback bar, etc.

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The computer derived angles for saws below 3.8 cubic inches (62 cm³) displacementare measured byapplying a computer program to test results from a kickback test machine.

WARNING

The computer derived angles of § 5.11 of ANSI B 175.1-2000 may bear no relationship to actual kickback bar rotationanglesthatmayoccurinreallife cutting situations.

In addition, features designed to reduce kickback injuries may lose some of their effectivenesswhentheyarenolongerin their original condition, especially if they have been improperly maintained.

Compliance with § 5.11 of ANSI

B 175.1-2000 does not automatically mean that in a real life kickback the bar and chain will rotate at most 45°.

WARNING

Inorderforpowerheadsbelow3.8 cubic inches (62 cm³) displacement to comply with the computed kickback angle requirements of § 5.11 of ANSI

B 175.1-2000 use only the following cutting attachments:

–bar and chain combinations listed as complying in the "Specifications" section of the instruction manual or

–other replacement bar and chain combinations marked in accordance with the standard for use on the powerhead or

–replacement chain designated "low kickback saw chain."

See the section on "Low kickback saw chain and reduced kickback bars."

English

Devices for Reducing the Risk of Kickback Injury

STIHL recommends the use of the STIHL Quickstop chain brake on your powerhead with green labeled reduced kickback bars and low kickback chains.

WARNING

To reduce the risk of injury, never use a saw if the chain brake does not function properly. Take the saw to your local STIHL servicing dealer. Do not use the saw until the problem has been rectified.

STIHL Quickstop Chain Brake

STIHL has developed a chain stopping system designed to reduce the risk of injury in certain kickback situations. It is called a Quickstop chain brake.

001BA174 KN

All STIHL chain saws are equipped with a Quickstop chain brake which can be activated by inertia. If the forces of an occurring kickback are sufficiently high,

English

the hand guard is accelerated towards the bar nose even without hand contact. See the chapter entitled "Chain Brake" of your instruction manual.

WARNING

Never operate your chain saw without a front hand guard. In a kickback situation this guard helps protect your left hand andotherpartsofyourbody.Inaddition, removal of the hand guard on a saw equipped with a Quickstop chain brake will deactivate the chain brake.

WARNING

No Quickstop or other chain brake device prevents kickback. These devices are designed to reduce the risk of kickback injury, if activated, in certain kickback situations. In order for the Quickstop to reduce the risk of kickback injury, it must be properly maintained and in good working order. See the chapter of your instruction manual entitled "Chain Brake" and the section "Maintenance, Repair and Storing" at the end of these Safety Precautions. In addition,theremustbeenoughdistance between the bar and the operator to ensure that the Quickstop has sufficient time to activate and stop the chain before potential contact with the operator.

WARNING

An improperly maintained chain brake may increase the time needed to stop the chain after activation, or may not activate at all.

WARNING

Never run the chain saw above idle speedformorethan3secondswhenthe chain brake is engaged or when the chain is pinched or otherwise caught in the cut. Clutch slippage can cause excessive heat, leading to severe damage of the motor housing, clutch and oiler component and may interfere with the operation of the chain brake. If clutch slippage in excess of 3 seconds hasoccurred,allowthemotorhousingto cool before proceeding and check the operation of your chain brake as described in the chapter entitled "Chain Brake" of your instruction manual. Also makesurethatthechainisnotturningat idle speed (see above at "Important Adjustments").

Low Kickback Saw Chain and Reduced Kickback Bars

STIHL offers a variety of bars and chains. STIHL reduced kickback bars andlowkickbackchainsaredesignedto reduce the risk of kickback injury. Other chains are designed to obtain higher cuttingefficiencyorsharpeningeasebut may result in higher kickback tendency.

STIHL has developed a color code system to help you identify the STIHL reducedkickbackbarsandlowkickback chains. Cutting attachments with green warning decals or green labels on the packaging are designed to reduce the risk of kickback injury. The matching of green decaled powerheads under

3.8 cubic inches (62 cm³) displacement with green labeled bars and green labeled chains gives compliance with the computed kickback angle requirements of ANSI B 175.1-2000

when the products are in their original condition.Productswithyellowdecalsor labels are for users with extraordinary cutting needs and experience and specialized training for dealing with kickback.

STIHL recommends the use of its green labeled reduced kickback bars, green labeled low kickback chains and a STIHL Quickstop chain brake for both experienced and inexperienced chain saw users.

Please ask your STIHL dealer to properlymatchyourpowerheadwiththe appropriate bar / chain combination to reduce the risk ofkickback injury. Green labeled bars and chains are recommended for all powerheads.

WARNING

Use of other, non-listed bar / chain combinations may increase kickback forces and the risk of kickback injury. New bar / chain combinations may be developed after publication of this literature,whichwill,in combinationwith certain powerheads, comply with § 5.11 of ANSI B 175.1-2000. Check with your STIHL dealer for such combinations.

WARNING

Reduced kickback bars and low kickback chains do not prevent kickback, but they are designed to reduce the risk of kickback injury. They are available from your STIHL dealer.

WARNING

Even if your saw is equipped with a Quickstop,areducedkickback bar and / or low kickback chain, this does not

MS 461

eliminate the risk of injury by kickback. Therefore, always observe all safety precautions to avoid kickback situations.

Low Kickback Chain

Some types of saw chain have specially designed components to reduce the force of nose contact kickback. STIHL has developed low kickback chain for your powerhead.

"Low kickback saw chain" is a chain which has met the kickback performance requirements of § 5.11.2.4 of ANSI B 175.1-2000 (GasolinePowered Chain Saws–Safety Requirements) when tested in its original condition on a selected representative sample of chain saws below 3.8 cubic inches (62 cm³) displacement specified in ANSI

B 175.1-2000.

WARNING

There are potential powerhead and bar combinations with which low kickback saw chains can be used which have not been specificallycertifiedtocomplywith the 45° computer derived kickback angle of § 5.11 of ANSI B 175.1-2000. Some low kickback chains have not been tested with all powerhead and bar combinations.

WARNING

A dull or improperly sharpened chain may reduce or negate the effects of the design features intended to reduce kickback energy. Improper lowering or sharpening of the depth gauges or shaping of the cutters may increase the

chance and the potential energy of a kickback. Always cut with a properly sharpened chain.

Reduced Kickback Bars

STIHL green labeled reduced kickback bars are designed to reduce the risk of kickback injury when used with STIHL green labeled low kickback chains.

WARNING

When used with other, more aggressive chains, these bars may be less effective in reducing kickback.

WARNING

For a properly balanced saw and in order to comply with § 5.12.1 of ANSI B 175.1-2000, use only bar lengths listed in the specifications chapter of the instruction manual for your chain saw powerhead.

Bow Guides

WARNING

DonotmountabowguideonanySTIHL chainsaw.Anychainsawequippedwith a bow guide is potentially very dangerous. The risk of kickback is increased with a bow guide because of the increased kickback contact area. Low kickback chain will not significantly reduce the risk of kickback injury when used on a bow guide.

English

To avoid Kickback

The best protection from personal injury that may result from kickback is to avoid kickback situations:

1.Hold the chain saw firmly with both hands and maintain a secure grip. Don’t let go.

2.Beawareofthelocationoftheguide bar nose at all times.

3.Never let the nose of the guide bar contact any object. Do not cut limbs with the nose of the guide bar. Be especially careful near wire fences and when cutting small, tough limbs,smallsizebrushandsaplings which may easily catch the chain.

4.Don't overreach.

5.Don't cut above shoulder height.

6.Begin cutting and continue at full throttle.

7.Cut only one log at a time.

8.Use extreme caution when reentering a previous cut.

9.Do not attempt to plunge cut if you are not experienced with these cutting techniques.

10.Be alert for shifting of the log or other forces that may cause the cut to close and pinch the chain.

11.Maintain saw chain properly. Cut withacorrectlysharpened,properly tensioned chain at all times.

12.Stand to the side of the cutting path of the chain saw.

MS 461

English

A = Pull-in

B = Pushback

A	001BA037 KN

Pull-in occurs when the chain on the bottom of the bar is suddenly stopped whenitispinched,caughtorencounters a foreign object in the wood. The reaction of the chain pulls the saw forward and may cause the operator to lose control.

Pull-in frequently occurs when the bumper spike of the saw is not held securely against the tree or limb and when the chain is not rotating at full speed before it contacts the wood.

WARNING

Use extreme caution when cutting small size brush and saplings which may easily catch the chain, be whipped towards you or pull you off balance.

To avoid Pull-in

1.Always start a cut with the chain rotating at full speed and the bumper spike in contact with the wood.

2.The risk of pull-in may also be reduced by using wedges to open the kerf or cut.

B	001BA038 KN

Pushback occurs when the chain on the top of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain may drive the saw rapidly straight back toward the operator and may cause loss of saw control. Pushback frequently occurs when the top of the bar is used for cutting.

To avoid Pushback

1.Be alert to forces or situations that may cause material to pinch the top of the chain.

2.Do not cut more than one log at a time.

3.Do not twist the saw when withdrawing the bar from a plunge cut or underbuck cut because the chain can pinch.

Cutting Techniques Felling

Felling is cutting down a tree.

Before felling a tree, consider carefully all conditions which may affect the direction of fall.

WARNING

There are a number of factors that may affectandchangetheintendeddirection of fall, e.g. wind direction and speed, lean of tree, surrounding trees and obstacles, sloping ground, one-sided limb structure, wood structure, decay, snow load, etc. To reduce the risk of severe or fatal injury to yourself or others, look for these conditions prior to beginning the cut, and be alert for a change in direction while the tree is falling.

WARNING

Always observe the general condition of the tree. Inexperienced users should never attempt to cut trees that are decayed or rotted inside or that are leaning or otherwise under tension. There is an increased risk that such trees could snap or split while being cut and cause serious or fatal injury to the operator or bystanders. Also look for broken or dead branches which could vibrate loose and fall on the operator. When felling on a slope, the operator should stand on the uphill side if possible.

MS 461

Felling Instructions

LÄ

1/2

001BA088

21/2

When felling, maintain a distance of at least 2 1/2 tree lengths from the nearest person.

When felling in the vicinity of roads, railwaysandpowerlines,etc.,takeextra precautions. Inform the police, utility company or railway authority before beginning to cut.

WARNING

Thenoiseofyourenginemaydrownany warning call.

Escape Path

45°

001BA040 KN

First clear the tree base and work area from interfering limbs and brush and clean its lower portion with an ax.

Then, establish two paths of escape (B) and remove all obstacles. These paths should be generally opposite to the planned direction of the fall of the tree

(A) and about at a 45° angle. Place all tools and equipment a safe distance away from the tree, but not on the escape paths.

English

Buttress Roots

KN001BA146

If the tree has large buttress roots, cut into the largest buttress vertically first (horizontally next) and remove the resulting piece.

Gunning Sight

001BA153 KN

When making the felling notch, use the gunningsightontheshroudandhousing to check the desired direction of fall:

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

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English

Conventional Cut

Open-face Technique

Making Sapwood Cuts

001BA143 KN

Felling notch (C) – determines the direction of the fall

For a conventional cut:

NProperly place felling notch perpendicular to the line of fall, close to the ground.

NCut down at approx. 45° angle to a depthofabout1/5to1/4ofthetrunk diameter.

N Make second cut horizontal. N Remove resulting 45° piece.

Felling notch (C) – determines the direction of the fall

For an open-face cut:

NProperly place felling notch perpendicular to the line of fall, close to the ground.

NCut down at approx. 50° angle to a depth of approx.1/5 to 1/4 of the trunk diameter.

NMake second cut from below at approx. 40 degree angle.

N Remove resulting 90° piece.

001BA150 KN

NFor medium sized or larger trees makecutsatbothsidesofthetrunk, at same height as subsequent felling cut.

NCut to no more than width of guide bar.

This is especially important in softwood in summer – it helps prevent sapwood splintering when the tree falls.

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D =Felling Cut

E = Hinge

001BA144 KN

Conventional and open-face technique:

NBegin 1 to 2 inches (2,5 to 5 cm) higher than center of felling notch.

NCut horizontally towards the felling notch.

NLeave approx.1/10 of diameter uncut. This is the hinge.

NDo not cut through the hinge – you could lose control of the direction of the fall.

Drive wedges into the felling cut where necessary to control the fall.

WARNING

If the tip of the bar contacts a wedge, it maycausekickback.Wedgesshouldbe of wood or plastic – never steel, which can damage the chain.

001BA145 KN

N Helps control the falling tree.

NDo not cut through the hinge – you could lose control of the direction of the fall.

English

Felling Cut for Small Diameter Trees: Simple Fan Cut

001BA147 KN

Engage the bumper spikes of the chain saw directly behind the location of the intendedhingeandpivotthesawaround this point only as far as the hinge. The bumper spike rolls against the trunk.

MS 461

English

Felling Cut for Large Diameter Trees

001BA148 KN

WARNING

Fellingatreethathasadiametergreater than the length of the guide bar requires use of either the sectioning felling cut or plunge-cut method. These methods are extremely dangerous because they involve the use of the nose of the guide bar and can result in kickback. Only properly trained professionals should attempt these techniques.

Sectioning Method

Forthesectioningmethodmakethefirst part of the felling cut with the guide bar fanning intowardthehinge.Then,using the bumper spike as a pivot, reposition the saw for the next cut.

Avoid repositioning the saw more than necessary. When repositioning for the next cut, keep the guide bar fully engaged in the kerf to keep the felling cut straight. If the saw begins to pinch, insert a wedge to open the cut. On the last cut, do not cut the hinge.

Plunge-cut Method

Timber having a diameter more than twicethelengthoftheguidebarrequires the use of the plunge-cut method before making the felling cut.

First, cut a large, wide felling notch. Make a plunge cut in the center of the notch.

The plunge cut is made with the guide bar nose. Begin the plunge cut by applying the lower portion of the guide barnosetothetreeatanangle.Cutuntil the depth of the kerf is about the same as the width of the guide bar. Next, align the saw in the direction in which the recess is to be cut.

With the saw at full throttle, insert the guide bar in the trunk.

Enlarge the plunge cut as shown in the illustration.

WARNING

There is an extreme danger of kickback atthispoint.Extracautionmustbetaken to maintain control of the saw. To make the felling cut, follow the sectioning method described previously.

If you are inexperienced with a chain saw, plunge-cutting should not be attempted. Seek the help of a professional.

MS 461

WARNING

In order to reduce the risk of personal injury, never stand directly behind the tree when it is about to fall, since part of the trunk may split and come back towards the operator (barber-chairing), or the tree may jump backwards off the stump. Always keep to the side of the falling tree. When the tree starts to fall, withdrawthebar,shutofftheengineand walk away on the preplanned escape path. Watch out for falling limbs.

WARNING

Be extremely careful with partially fallen trees which are poorly supported. When the tree hangs or for some other reason does not fall completely, set the saw asideandpullthetreedownwithacable winch, block and tackle or tractor. If you trytocutit down with yoursaw, youmay be injured.

Limbing

Limbingisremovingthebranchesfroma fallen tree.

WARNING

There is an extreme danger of kickback during the limbing operation. Do not work with the nose of the bar. Be extremelycautiousandavoidcontacting thelogorotherlimbswiththenoseofthe guide bar.

Do not stand on a log while limbing it – you may slip or the log may roll.

Start limbing by leaving the lower limbs to support the log off the ground. When underbucking freely hanging limbs, a pinch may result or the limb may fall,

MS 461

causinglossofcontrol.Ifapinchoccurs, stop the engine and remove the saw by lifting the limb.

WARNING

Be extremely cautious when cutting limbs or logs under tension (spring poles). The limbs or logs could spring backtowardtheoperatorandcauseloss of control of the saw and severe or fatal injury to the operator.

Bucking

001BA033 KN

Bucking is cutting a log into sections.

WARNING

When bucking, do not stand on the log. Makesure thelog willnotrolldownhill.If onaslope,standontheuphillsideofthe log. Watch out for rolling logs.

Cut only one log at a time.

English

Shattered wood should be cut very carefully. Sharp slivers of wood may be caught and flung in the direction of the operator of the saw.

001BA051 LÄ

When cutting small logs, place log through"V"-shaped supports ontop ofa sawhorse. Never permit another person to hold the log. Never hold the log with your leg or foot.

English

2	KN
	001BA151


2
1	KN
	001BA152

Logs under strain:

Risk of pinching! Always start relieving cut (1) at compression side.Then make buckingcut (2)attensionside.Ifthesaw pinches, stop the engine and remove it from the log.

Only properly trained professionals should work in an area where the logs, limbs and roots are tangled. Working in "blow down" areas is extremely hazardous. Drag the logs into a clear area before cutting. Pull out exposed and cleared logs first.

MAINTENANCE, REPAIR AND STORING

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.

WARNING

Use only identical STIHL replacement partsformaintenanceandrepair.Useof non-STIHL parts may cause serious or fatal injury.

Strictly follow the maintenance and repair instructions in the appropriate section of your instruction manual.

Please refer to the maintenance chart in this manual.

WARNING

Always stop the engine and make sure that the cutting tool is stopped before doinganymaintenanceorrepairworkor cleaning the power tool.

WARNING

Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed by your STIHL servicing dealer only. For example, if improper tools are used to remove the flywheel or if an improper tool is used to hold the flywheel in order to remove the clutch, structural damage to the flywheel could occurandcouldsubsequentlycausethe flywheel to burst.

Wear gloves when handling or performing maintenance on saw chains.

WARNING

Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plugterminalofthepropersize.(Note:If terminal has detachable SAE adapter nut, it must be securely attached.) A loose connection between spark plug terminal and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.

WARNING

Never test the ignition system with the spark plug boot removed from the spark plugorwitharemovedsparkplug,since uncontained sparking may cause a fire.

WARNING

Do not operate your power tool if the mufflerisdamaged,missingormodified. An improperly maintained muffler will increasetheriskoffireandhearingloss. Your muffler is equipped with a sparkarresting screen to reduce the risk of fire; never operate your power tool if the screen is missing, damaged or clogged. Remember that the risk of a brush or forest fire is greater in hot or dry weather.

In California, it is a violation of § 4442 or § 4443 of the Public Resources Code to use or operate gasoline-powered tools on forest-covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a complying spark arrester that is maintained in effective working order. The owner/operator of this product is

MS 461

responsible for properly maintaining the spark arrester. Other states or governmentalentities/agencies,suchas the U.S. Forest Service, may have similar requirements. Contact your local fire agency or forest service for the laws or regulations relating to fire protection requirements.

Keep the chain, bar and sprocket clean; replace worn sprockets or chains. Keep the chain sharp. You can spot a dull chain when easy-to-cut wood becomes hard to cut and burn marks appear on the wood. Keep the chain at proper tension.

Tightenallnuts,boltsandscrewsexcept the carburetor adjustment screws after each use.

WARNING

In order for the chain brake on your STIHL chain saw to properly perform its function of reducing the risk of kickback and other injuries, it must be properly maintained.Likeanautomobile brake,a chain saw chain brake incurs wear each time it is engaged.

The amount of wear will vary depending upon usage, conditions under which the sawisusedandotherfactors.Excessive wear will reduce the effectiveness of the chain brake and can render it inoperable.

Fortheproperandeffectiveoperationof the chain brake, the brake band and clutch drum must be kept free of dirt, grease and other foreign matter which may reduce friction of the band on the drum.

For these reasons, each STIHL chain saw should be returned to trained personnel such as your STIHL servicing dealer for periodic inspection and servicing of the brake system according to the following schedule:

Heavy usage – every three months, Moderate usage – twice a year, Occasional usage – annually.

The chain saw should also be returned immediately for maintenance whenever the brake system cannot be thoroughly cleaned or there is a change in its operating characteristics.

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

Do not clean your machine with a pressure washer. The solid jet of water may damage parts of the machine.

Store chainsawinadry place and away from children. Before storing for longer than a few days, always empty the fuel tank (see chapter "Storing the Machine" in the instruction manual).

English

Cutting Attachment

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

Acuttingattachmentconsistsofthesaw chain, guide bar and chain sprocket.

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

1	2
	2
	3	KN
a	3	001BA248
		001BA248

–The pitch (t) of the saw chain (1), chain sprocket and the nose sprocketoftheRollomaticguidebar 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, thecuttingattachmentmaybedamaged beyond repair after a short period of operation.

MS 461

English

Chain scabbard

Fitting chain scabbard extension

Mounting the Bar and Chain

001BA244 KN

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

If you use guide bars of different lengths on the saw, the length of the chain scabbard must be matched to the guide bar to help reduce the risk of injury. It should cover the full length of the guide bar.

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

Chain scabbard extensions

One chain scabbard extension is required for guide bars longer than 35.4 in (90 cm). Two extensions are required for guide bars longer than 47.2 in (120 cm).

Depending on original equipment, the chain scabbard extension either comes with the machine or is available as a special accessory.

1	3	2
		KN
	3	001BA249
	3

NPush the chain scabbard extension (1) and chain

scabbard (2) together, making sure the locking tabs (3) engage in the chain scabbard

		KN
		001BA250
3

NIf more than one chain scabbard extension is required, push the second chain scabbard extension and the first chain scabbard extensiontogether,makingsurethe locking tabs (3) engage in the first chain scabbard extension

Removing the chain sprocket cover

143BA034 KN

NUnscrew the nuts and take off the chain sprocket cover.

	1
2	KN
	001BA185

NTurn the screw (1) counterclockwiseuntilthetensioner slide (2) butts against the left end of the housing slot.

MS 461

Disengaging the chain brake.

001BA186 KN

NPull the hand guarad towards the front handle until there is an audible click – the chain brake is disengaged.

Fitting the chain

143BA003 KN

WARNING

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

N Fit the chain – start at the bar nose.

001BA187 KN

NFittheguidebaroverthestuds (1)– the cutting edges on the top of the bar must point to the right.

NEngage the peg of the tensioner slideinthelocatinghole (2)–-place the chain over sprocket (3) at the same time.

NTurn 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.

NRefit the sprocket cover and screw on the nuts only fingertight.

NGo to chapter on "Tensioning the Saw Chain"

English

Tensioning the Chain

133BA024 KN

Retensioning during cutting work: N Shut off the engine.

N Loosen the nuts.

N Hold the bar nose up.

NUse a screwdriver to turn the tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar.

NWhile still holding the bar nose up, tighten down the nuts firmly.

N Go to "Checking Chain Tension".

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

NCheck chain tension frequently – see chapter on "Operating Instructions".

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English

Checking Chain Tension

143BA007 KN

N Shut off the engine.

NWear work gloves to protect your hands.

NThe 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.

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

NCheck chain tension frequently – see chapter on "Operating Instructions".

Fuel

This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.

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

Usemid-gradeunleadedgasolinewitha minimum octane rating of 89 ((R+M)/2) and no more than 10% ethanol content.

Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of 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.),butmagnesiumcastingsand catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only high-quality unleaded gasoline!

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

The ethanol content in gasoline affects engine running speed – it may be necessary to readjust the carburetor if you use fuels with various ethanol contents.

WARNING

Ifyourpowertoolshowsanincorrectidle adjustment, have your STIHL dealer check your power tool and make proper adjustments and repairs.

The idle speed and maximum speed of the engine change if you switch from a fuel with a certain ethanol content to another fuel with a much higher or lower ethanol content.

This problem can be avoided by always using fuel with the same ethanol content.

Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines.

WerecommendSTIHLHPUltra2-Cycle Engine Oil since it is specially formulated for use in STIHL engines.

Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mixoilsthatstatetheyareforuseinboth water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.).

WARNING

Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the container from your vehicle and place the

MS 461

containeronthegroundbeforefilling.To reduce the risk of sparks from static discharge and resulting fire and/or explosion, do not fill fuel containers that are sitting in or on a vehicle or trailer.

The container should be kept tightly closed in order to limit the amount of moisture that gets into the mixture.

The machine‘s fuel tank should be cleaned as necessary.

Fuel mix ages

Only mix sufficient fuel for a few days work,nottoexceed3monthsofstorage. Store in approved fuel-containers only. When mixing, pour oil into the container first, and then add gasoline. Close the container and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.

Gaso-	Oil (STIHL 50:1 or equiva-
line	lent high-quality oils)
US gal.	US fl.oz.

12.6

2 1/2

6.4

512.8

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

English

Fueling Opening

Preparations

001BA229 KN

NBefore fueling, clean the filler cap andtheareaaroundittoensurethat no dirt falls into the tank.

Always thoroughly shake the mixture in the canister before fueling your machine.

NPosition the machine so that the filler cap is facing up.

WARNING

In order to reduce the risk of fire and other personal injury from escaping gas vapor and fumes, remove the fuel filler capcarefullysoastoallowanypressure build-up in the tank to release slowly

001BA236 KN

N Raise handle.

001BA232 KN

NTwist filler cap counterclockwise (approx. 1/4 turn).

001BA234 KN

Markings on filler cap and housing must align.

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English

001BA237 KN

N Remove the filler cap.

Refueling

Take care not to spill fuel while fueling and do not overfill the tank – leave approx. 1/2" (13 mm) air space.

Closing

001BA234 KN

Handle is in an upright position:

NPositionfillercap–markingsonfiller cap and housing must align.

NPush the filler cap down as far as it will go.

001BA233 KN

NPush the filler cap down and twist it clockwise until it engages.

001BA231 KN

Then the markings on filler cap and housing will align.

001BA235 KN

N Flip the handle down.

001BA241 KN

Filler cap is now closed.

If the filler cap will not engage into the tank housing

The base of the filler cap is rotated in relation to the upper part.

NLook at the black alignment marks on the top of the filler cap.

	1
	001BA238KN
Left:	Base of filler cap is rotated –
	interiormarking(1)isaligned
	with the exterior marking.
Right:	Base of filler cap is in the cor-
	rect position – interior
	marking is below the clip. It
	does not align with the exte-
	rior marking.

MS 461

+ 98 hidden pages