STIHL FS 70 R Instruction Manual

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STIHL FS 70

Instruction Manual

Manual de instrucciones

WARNING

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

ADVERTENCIA

Antes de usar la máquina 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 - 43

Manual de instrucciones 44 - 89

English

Contents

Printing inks contain vegetable oils, paper can be recycled.

Printed on chlorine-free paper Original Instruction Manual

© ANDREAS STIHL AG & Co. KG, 2014 0458-570-8621-E. VA4.M14. 0000001656_020_GB

Guide to Using this Manual

2

STIHL Incorporated Federal

Safety Precautions and Working

 

Emission Control Warranty

Techniques

3

Statement

Approved Combinations of Cutting

 

STIHL Incorporated California

Attachment, Deflector, Handle and

16

Exhaust and Evaporative

Harness

Emissions Control Warranty

Mounting the Loop Handle

17

Statement

Mounting the Deflector

19

Trademarks

Mounting the Cutting Attachment

19

 

Fuel

22

 

Fueling

23

 

Fitting the Harness

24

 

Starting / Stopping the Engine

24

 

Transporting the Unit

26

 

Operating Instructions

27

 

Cleaning the Air Filter

27

 

Engine Management

28

 

Adjusting the Carburetor

28

 

Spark Plug

28

 

Engine Running Behavior

29

 

Rewind Starter

30

 

Storing the Machine

30

 

Sharpening Metal Cutting Blades

30

 

Maintaining the Mowing Head

31

 

Inspections and Maintenance by

 

 

Dealer

32

 

Maintenance and Care

33

 

Main Parts

35

 

Specifications

37

 

Maintenance and Repairs

38

 

Disposal

38

 

Allowonlypersonswhofullyunderstand this manual to operate your trimmer /

38brushcutter.

To receive maximum performance and satisfaction from your STIHL trimmer /

brushcutter,itisimportantthatyouread, 40 understand and follow the safety

43precautions and the operating and maintenance instructions in chapter "Safety Precautions and Working Techniques"beforeusingyourtrimmer/ brushcutter. For further information you can go to www.stihlusa.com.

Contactyour STIHLdealer or theSTIHL distributor for your area if you do not understandanyoftheinstructionsinthis manual.

WARNING

Because a trimmer / brushcutter is a high-speed cutting tool some special safety precautions must be observed to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury.

Makesureyourunitisequippedwiththe properdeflector,handleandharnessfor the type of cutting attachment being used. Always wear proper eye protection.

{This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic systems.

FS 70 R

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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 for gasoline and engine oil mixture

Press to operate decom- pression valve

Manual fuel pump

Press to operate manual fuel pump

Filler hole for gear lubricant

Air intake summer mode

Air intake winter mode

Handle heating

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 or the STIHL distributor for your area for assistance.

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FS 70 R

Safety Precautions and

Working Techniques

Because a trimmer / brushcutter is a highspeed, fast-cutting power tool sometimes equipped with sharp cutting blades, special safety precau- tions must be observed to reduce the risk of per- sonal injury.

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

The terminology utilized in this manual when referring to the power tool reflects the fact that different types of cutting attachments may be mounted on it. The term "trimmer" is used to designate an FS unit thatisequippedwith anylonline head or a head with flexible plastic blades (i.e., the PolyCut head.) A "brushcutter" designates a unit equipped with a rigid metal blade. Many FS models may be used as either a trimmer or a brushcutter – therefore, the powertoolisreferredinthismanualasa "trimmer / brushcutter". Some smaller and / or lightweight FS models may only be used as a trimmer, i.e., they may not be used with metal blades.

FS 70 R

FSmodelswithan"R"onthenameplate were originally configured (at the time of distribution) as a trimmer with a loop handle.

WARNING

As more fully explained later in these Safety Precautions, to reduce the risk of personal injury, make sure your unit is equipped with the proper handle, harness and deflector for the type of cutting attachment you are using. Use only cutting attachments that are specifically authorized by STIHL for use on your FS model.

Have your STIHL dealer show you how to operate your power tool. Observe all applicable local safety regulations, standards and ordinances.

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. If the rotating line or blade comes in contact with your body, it will cut you. When it comes in contact with solid foreign objects such as rocks or bits of metal, it may fling them directly or byricochetinthedirectionofbystanders or the operator. Striking such objects could damage the cutting attachment and may cause blades to crack, chip or break.Thrownobjects,including broken headsorblades,mayresultinseriousor fatal injury to the operator or bystanders.

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STIHL does not recommend the use of rigid blades when cutting in stony areas.

Useyourtrimmer/brushcutterequipped with the appropriate cutting attachment only for cutting grass and similar material.

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 trimmer / brushcutters. Different models may have different parts and controls. See the appropriate section of your instruction manual for a description of thecontrols and thefunctionofthe parts of your model.

Safe use of a trimmer / brushcutter involves

1.the operator

2.the power tool

3.the use of the power tool.

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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.

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

4

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.

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.

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.

The deflector provided with your power tool will not protect the operator from all foreign objects (gravel, glass, wire, etc.) thrown back by the rotating cutting attachment. Thrown objects may also ricochet and strike the operator.

FS 70 R

WARNING

To reduce the risk of injury to your eyes never operate your power tool unless wearing goggles

or properly fitted protec- tive glasses with adequate top and side protection complying with ANSI Z87 "+" (or your applicable national stand- ard). 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.

Wear an approved safety hard hat to reduce the risk of injury to your head when there is a danger of head injuries.

Power tool noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly.

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

FS 70 R

Always wear heavy duty work gloves (e.g. made of leather or other wear resistant material) when handling the machine and metal blades. Heavyduty, nonslip gloves improve your grip and help to protect your hands.

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. Do not wear shorts, sandals or go barefoot.

Avoid loose-fitting jackets, 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.

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 and expressly approved by STIHL for

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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. For the cutting attachments authorized by STIHL for your unit, see the chapter "Approved Combinations of Cutting Attachment, Deflector, Handle and Harness"intheinstructionmanualorthe STIHL "Cutting Attachments, Parts & Accessories" catalog.

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 continuing work.Checkin particularthat 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 loss of control and blade or line contact, never carry or transport your power tool with the cutting attachment moving.

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389BA019 KN

It may be carried only in a horizontal position. Grip the shaft in a manner that the machine is balanced horizontally. Keep the hot muffler away from your body and the cutting attachment behind you.

WARNING

Always shut off the engine and make surethecuttingattachmenthasstopped before putting a trimmer / brushcutter down. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit. STIHLrecommendsthatyoukeepmetal blades covered with the transport guard (optional accessory.)

Fuel

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

6

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

To reduce the risk of serious injury from burns, never attempt to refuel the unit until it has been completely removed from the operator.

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 caponyourpowertoolcarefullysoasto allow any pressure build-up in the tank to releaseslowly.Neverremove thefuel filler cap while the engine is running.

Selectbaregroundforfueling andmove 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.

WARNING

Unit vibrations can cause an improperly tightened fuel filler cap to loosen or

come off and spill quanti- ties of fuel. In order to reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand as securely as possible.

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

FS 70 R

Before Starting

WARNING

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

WARNING

Check fuel system for leaks, especially the visible parts, e.g., filler cap, hose connections,manual fuelpump (onlyfor powertoolsequippedwithamanualfuel pump). Do not start the engine if there are leaks or damage – risk of fire! Have the machine repaired by a servicing dealer before using it.

WARNING

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

WARNING

Do not attach any cutting attachment to a unit without proper installation of all required parts. Failure to use the proper parts may cause the blade or head to fly off and seriously injure the operator or bystanders.

WARNING

Thecuttingattachmentmustbeproperly tightened and in safe operating condition. Inspect for loose parts (nuts, screws, etc.) and for cracked or otherwise damaged heads or cracked, bent, warped or otherwise damaged blades. Replace damaged heads or blades before using the power tool. Always keep blades sharp.

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.

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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WARNING

To reduce the risk of personal injury to the operator

from blade or line contact and thrown objects, make sure your unit is equipped with the proper deflector, handle and harness for the type of cutting attachment being used (see chart in the chapter on "Approved Combi- nations of Cutting Attachment, Deflector, Handle and Harness".)

As can be seen in that chart, some cutting attachments may require you to change your deflector, handle and / or harness.

Keep the deflector (and the attached skirt where appropriate) adjusted properly at all times (see chapters on "Mounting the Deflector" and "Mounting the Cutting Attachment" of your instruction manual.)

FS 70 R

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A

000BA006 KN

Arrow shown in illustration (A) (as seen from the underside of the deflector) shows the correct direction of rotation of the cutting attachment (clockwise). When viewed from above, however, the cutting attachment rotates counterclockwise (see arrow embossed on top of deflector).

Some of the following symbols may be embossedontheoutsideofthedeflector in order to indicate the approved combination of cutting attachment and deflector.

The deflector may be used in combination with mowing heads.

The deflector may be used in combination with grass cutting blades.

The deflector may be used in combination with brush knives.

The deflector must not be used in combination with mowing heads.

The deflector must not be used in combination with grass cutting blades.

The deflector must not be used in combination with brush knives.

The deflector must not be used in combination with circular saw blades.

The deflector must not be used in combination with brush knives or circular saw blades.

The deflector must not be used in combination with grass cutting blades, brush knives or circular saw blades.

Adjustcarryingharnessandhandgripto suit your size before starting work. The machineshouldbeproperlybalancedas specified in your instruction manual for proper control and less fatigue in operation.Tobebetterpreparedincase of an emergency, practice releasing the unit from the harness as quickly as possible.

Starting

WARNING

Start the engine at least 10 feet (3 m) from the fueling spot, outdoors only.

Forspecificstartinginstructions,seethe appropriate section of your manual. Place the power tool on firm ground or other solid surface in an open area. Maintain good balance and secure footing.

WARNING

Toreducetheriskofinjuryfrombladeor line contact, be absolutely sure that the cuttingattachmentisclearofyouand all otherobstructionsandobjects,including the ground, because when the engine starts at starting-throttle, engine speed will be fast enough for the clutch to engage and move the cutting attachment.

Once the engine has started, immediately blip the throttle trigger, whichshouldreleasethestartingthrottle and allow the engine to slow down to idle.

With the engine running only at idle, attach the power tool to the spring hook of your harness (see appropriate chapter of this manual.)

WARNING

Your power tool is a one-person machine. Do not allow other persons in the general work area, even when starting.

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FS 70 R

WARNING

To reduce the risk of injury from loss of control, do not attempt to "drop start" your power tool.

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 or contact with the running cutting attachment, do not use your unit with incorrect idle adjustment. At correct idle speed, the cutting attachment should not move. For directions on how to adjust idle speed, 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.

WARNING

This unit is equipped with an ignition system that is normally in operational readiness. After the stop switch is used to stop the engine, it automatically springs back to the "on" position. If the engine is warm, it may be possible to start it by simply pulling the starter rope,

FS 70 R

with no further adjustments. To reduce the risk of injury, be particularly alert to keep children away from the unit.

During Operation

Holding and Controlling the Power Tool

002BA273 KN

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

WARNING

To reduce the risk of injury from loss of control,neverworkonaladderoronany other insecure support. Never hold the cutting attachment above waist height.

WARNING

Never attempt to operate your power tool with one hand. Loss of control of

the power tool resulting in serious or fatal injury may result. To reduce the risk of cut injuries, keep hands and feet away from the cutting attach- ment. Never touch a moving cutting attach- ment with your hand or any other part of your body.

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WARNING

Do not overreach. Keep proper footing and balance at all times. Special care mustbetakeninslipperyconditions(wet ground,snow)andindifficult,overgrown terrain.Watchforhiddenobstaclessuch as tree stumps, roots and ditches to avoidstumbling.Forbetterfooting,clear away scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.

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.

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.

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WARNING

If the vegetation being cut or the surrounding ground is coated with a chemical substance (such as an active pesticide or herbicide), read and follow the instructions and warnings that accompanied the substance at issue.

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. Control dust at the source where possible. Use good work practices, such as operating the unit so that the wind or operating process directsanydustraisedbythepowertool 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.

Operating Instructions

WARNING

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

In the event of an emergency, switch off the engine immediately – press the stop switch towards 0 or STOP.

WARNING

The cutting attachment continues to rotate for a short period after the throttle trigger is released (flywheel effect.)

WARNING

The rotating cutting attachment may fling foreign objects directly or by ricochet a great distance.

15m (50ft)

Toreducetheriskofeyeandotherinjury always wear proper eye protection (see the chapter on "Proper Clothing") and ensure that bystanders are at least 15 m (50 feet) away. To reduce the risk ofdamagetoproperty,alsomaintainthis distance from such objects as vehicles or windows. Even maintaining a minimum distance of 15 meters cannot exclude all potential risks. Any coworkers who must be in the restricted area should also wear goggles or protective glasses. Stop the engine immediately if you are approached.

WARNING

Inspect the work area: To reduce the risk of injury, remove stones, pieces of

metal and other solid objects which could be thrown 15 meters or more

by the cutting attachment

or damage the cutting

attachment or other prop- erty (e.g. parked vehicles, windows).

WARNING

This trimmer / brushcutter is normally to be used at ground level with the cutting attachmentparalleltotheground.Useof a trimmer / brushcutter above ground level or with the cutting attachment perpendicular to the ground may increase the risk of injury, since the cuttingattachmentismorefullyexposed and the power tool may be more difficult to control.

WARNING

During cutting, check the tightness and theconditionofthecuttingattachmentat regular short intervals with the engine and attachment stopped. If the behavior of the attachment changes during use, stop the engine immediately, wait until the cutting attachment stops, and check the nut securing the attachment for tightness and the blade or head for cracks, wear or other damage.

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FS 70 R

WARNING

A loose blade or head may vibrate, crack, break or come off the trimmer / brushcutter, which may result in serious or fatal injury. Make sure that the cutting attachment is properly tightened. Use the wrench supplied or one of sufficient length to obtain the proper torque. If the blade or head loosens after being properly tightened, stop work immediately. The retaining nut may be worn or damaged and should be replaced. If the blade or head continues toloosen,seeyourSTIHLdealer.Never use a trimmer / brushcutter with a loose cutting attachment.

WARNING

Replace a cracked, damaged or wornout head or a cracked, bent, warped, damaged, dull or worn out blade immediately,evenifdamageislimitedto superficial cracks. Such attachments may shatter at high speed and cause serious or fatal injury.

WARNING

When using rigid blades, avoid cutting close to fences, sides of buildings, tree trunks, stones or other such objects that could cause the power tool to kick out or could cause damage to the blade.

STIHLrecommendsuseofthenylonline heads for such jobs. In addition, be alert toanincreasedpossibilityofricochetsin such situations.

WARNING

If a rotating metal blade strikes a rock or other hard object, sparks may be created, which can ignite flammable materials under certain circumstances. Flammable materials can include dry vegetation and brush, particularly when weather conditions are hot and dry. When there is a risk of fire or wildfire, do not use metal blades around flammable materials or around dry vegetation or brush. Contact your local fire authorities or the U.S. Forestry Service if you have any question about whether vegetation and weather conditions are suitable for the use of a metal blade.

WARNING

If the head, blade or deflector becomes clogged or stuck, always shut off the engine and make sure the cutting attachment has stopped before cleaning. Grass, weeds, etc. should be cleaned off the blade or from around the head at regular intervals.

WARNING

To reduce the risk of unintentional rotation of the cutting attachment and injury, always shut off the engine and remove the spark plug boot before replacing the cutting attachment. To reduce the risk of injury, always shut off theenginebeforeadjustingthelengthof the nylon line on manually adjustable mowing heads.

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WARNING

Do not pull on the starter rope with the spark plug boot or spark plug removed since the ignition is normally in the "ON" position and there is a risk of fire from uncontained sparking.

WARNING

The gearbox becomes hot during operation. To reduce the risk of burn injury, do not touch the gear housing when it is hot.

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 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 (away from any combustible substances, such as dry bush, grass or wood chips.

FS 70 R

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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 muffler maintained bya STIHLservicing 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.

USING THE CUTTING ATTACHMENT

For an illustration of the various cutting attachments and instructions on proper mounting see the chapter on "Mounting the Cutting Attachment" in your instruction manual.

WARNING

To reduce the risk of severe or fatal injury from blade contact and / or loss of control, never attempt to use a metal blade on an FS model for which it is not authorized.

Using the Mowing Heads

Do not use with mowing line longer than the intended length. With a properly mounted deflector, the built-in linelimiting blade will automatically adjust the line to its proper length.

Using the unit with an overly long nylon cutting line increases the load on the engineandreducesitsoperatingspeed. This causes the clutch to slip continuously and results in overheating and damage to important components (e.g. clutch, polymer housing components.) Such damage could, among other things, cause the cutting attachment to rotate at idle.

002BA354 KN

Mowing heads are to be used only on trimmer / brushcutters equipped with a line-limiting blade in the deflector in order to keep the line at the proper length (see "Main Parts" chapter in your instruction manual.)

If the lawn edges are planted with trees or bordered by a fence etc., it is best to use a nylon line head. It achieves a "softer" cut with less risk of damaging tree bark etc. than polymer blades.

However, the polymer-bladed STIHL PolyCut produces a better cut if there arenoplantsalongtheedgeofthelawn. Sharpening is not necessary, and worn polymer blades are easily replaced.

WARNING

To reduce the risk of serious injury, never use wire or metal-reinforced line or other material in place of the nylon cutting lines. Pieces of wire could break off and be thrown at high speed toward the operator or bystanders.

STIHL SuperCut mowing head

Fresh line is advanced automatically. Frayed line is replaced by a simple adjustment (see instruction sheet supplied with mowing head.)

STIHL AutoCut mowing head

Nylon cutting line advances automatically when tapped against the ground (TapAction.)

STIHL TrimCut mowing head

Frayed line is replaced by a simple adjustment (see instruction sheet supplied with mowing head.)

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FS 70 R

STIHL PolyCut mowing head

002BA177 KN

Uses either nylon lines or nonrigid, pivoting polymer blades.

Observe wear indicators.

WARNING

Three rectangular wear limit marks are applied to the base (periphery) of the PolyCut. To reduce the risk of serious injurytothe operatororbystanders from breakage of the head or blades, the PolyCut must not be used when it has worn as far as one of these marks. It is important to follow the maintenance instructions supplied with the head.

WARNING

To reduce the risk of accidents from shattered blades, avoid contact with stones, metal and similar solid objects. Check PolyCut blades for cracks at regular intervals. If a crack is found on one blade, always replace all blades.

STIHL FixCut mowing head Uses pre-cut lengths of nylon line. Observe wear indicators.

Do not continue using the mowing head if the raised moldings (1) on the base are missing or worn – see right illustration above. The mowing head mayotherwiseshatterandflyingobjects could result in injury to the operator or bystanders. Install a new mowing head.

English

Risk of Kickout (Blade Thrust) with All Rigid Cutting Blades

002BA135 KN

WARNING

Kickout (blade thrust) is the sudden and uncon- trolled motion towards

the operator's right or rear that can occur when the shaded area (espe- cially the darkly shaded area) of a rotating blade comes in contact with a solid rigid object like a tree, rock, bush or wall. The rapid counterclock- wise rotation of the blade may be stopped or slowed, and the cutting attachment may be thrown to the right or to the rear.

This kickout (blade thrust) may cause lossofcontrolofthepowertoolandmay result in serious or fatal injury to the operator or bystanders. To reduce the risk of injury, extreme caution should be used when cutting with the shaded area of any rigid blade.

FS 70 R

13

English

Using the Grass Cutting Blade

002BA355 KN

All kinds of grass and weeds can be easily cut with the grass cutting blade. The power tool is swept in an arc similar to a scythe.

WARNING

To reduce the risk of serious or fatal injury from blade breakage, never attempt to use this blade to cut woody materials.

The 4-tooth grass cutting blade is intended to cut grass and weeds. It has 4 cutting knives with cutting edges on both sides, i.e. front and rear. When the cutting edges on one side become dull, the blade can be turned over to utilize the cutting edges on the other side.

The 8-tooth grass cutting blade is recommended for cutting fern or reed.

Bothtypesofgrasscuttingbladehaveto be resharpened when all cutting edges are dull.

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

14

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 sections of your instruction manual.

WARNING

Always stop the engine and make sure that the cutting attachment is stopped before doing any maintenance or repair work or cleaning the power tool. Do not attempt any maintenance or repair work notdescribedinyourinstructionmanual. Have such work performed by your STIHL servicing dealer only.

Wear gloves when handling or performing maintenance on blades.

WARNING

Use the specified spark plug, and make sure it and the ignition lead are always clean and in good condition. Always press the spark plug boot snugly onto the spark plug terminal of the proper size. (Note: If the terminal has a detachable SAE adapter nut, it must be securely attached.) A loose connection between the spark plug 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 systemby pulling the starter rope with the spark plug boot removed from the spark plug or with a removed sparkplug,since theignitionis normallyin the "on" positionand thereis a risk that 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 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.

FS 70 R

English

WARNING

Never repair damaged cutting attachmentsbywelding,straighteningor modifying the shape. This may cause parts of the cutting attachment to come off and result in serious or fatal injuries.

Keep blades sharp. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use.

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

Store the power tool in a dry and high or locked location out of reach of children.

Before storing for longer than a few days, always empty the fuel tank. See chapter "Storing the Machine" in the instruction manual.

FS 70 R

15

English

Approved Combinations of Cutting Attachment, Deflector, Handle and Harness

Cutting Attachment

Deflector

Handle

Harness

 

1

2

 

 

 

3

10

123

134

 

4

 

 

 

 

145

17

5

6

 

15

 

 

 

7

 

 

 

 

 

11

134

8

9

145

16 17

681BA286 KN

Approved Combinations

The complete combination includes:

Cutting attachment

Deflector

Handle

Shoulder strap/harness

16

Select correct combination from the table according to the cutting attachment you intend to use.

WARNING

For safety reasons only the cutting attachments, deflectors, handles and harnesses shown in each row of the table may be used together. No other combinations are permitted because of the risk of accidents.

Cutting Attachments

Mowing heads

1 STIHL SuperCut 20-2

2 STIHL AutoCut C 25-2

3 STIHL AutoCut 25-2

4 STIHL TrimCut 31-2

5 STIHL FixCut 25-2

6 STIHL DuroCut 20-2

7STIHL PolyCut 20-3

FS 70 R

Metal cutting attachments

8Grass cutting blade 230-4 (Ø 230 mm)

9Grass cutting blade 230-8 (Ø 230 mm)

WARNING

Non-metal grass cutting blades are not approved.

Deflectors

10Deflector with blade for mowing heads

11Deflector for metal cutting attachments

Handle

12Loop handle

13Loop handle with

14Barrier bar

Shoulder strap/harness

15Shoulder strap may be used

16Shoulder strap must be used

17Full harness may be used

WARNING

Based on the cutting attachment being used:

Choose the proper deflector in order to reduce the risk of injury from thrown objects and contact with the cutting attachment.

Makesureyourunitisequippedwiththe proper handle and harness in order to reduce the risk of injury from loss of control and contact with the cutting attachment: use grass cutting metal blades on this unit only if equipped with a bike handle or a loop handle with barrier bar.

Do not use rigid plastic blades, brush knifes or circular saw blades on this unit.

English

Mounting the Loop Handle

002BA586 KN

A factory-new machine comes with the loop handle already mounted.

Using the Barrier Bar

002BA587 KN

Abarrierbarmayhavetobemountedto suit the cutting attachment you intend to use – see "Approved Combinations of Cutting Attachment, Deflector, Handle and Harness".

The barrier bar comes standard with the machine or is available as a special accessory.

FS 70 R

17

English

Mounting the Barrier Bar

1

1

 

2

 

2

 

 

 

 

 

4

 

5

 

5

3

KN

3

002BA588

 

 

 

NTakeoutthescrews (1)andremove along with washers (2) and nuts (3).

NRemove the loop handle (4) and clamps (5).

 

3

KN

3

 

002BA609

NFit the square nuts (3) in the barrier bar (6); the holes must line up.

4

6

 

 

7

 

 

8

 

9

1

KN

1

002BA610

 

 

 

NPlace the clamp (7) in the loop handle (4) and position them both against the drive tube (8).

NPosition the clamp (8) against the drive tube.

NPlace the barrier bar (6) in position as shown.

N Line up the holes.

NInsert the screws (1) in the holes and screw them into the barrier bar as far as stop.

NGo to "Adjusting and Securing the Loop Handle".

Leave the barrier bar permanently mounted to the loop handle.

Adjusting and Securing the Loop Handle

A

4

002BA611 KN

The loop handle can be adjusted to suit theheightandreach oftheoperatorand the application by changing

distance (A).

Recommendation: distance (A): about 15 cm (5.9 in)

NSlide the handle to the required position.

N Line up the loop handle (4).

NTighten down the screws until the loop handle can no longer be rotated on the drive tube. If no barrier bar is fitted – lock the nuts if necessary.

18

FS 70 R

Mounting the Deflector

Use the right deflector

1

002BA262 KN

WARNING

Deflector (1) is approved for mowing heads only and must therefore be mounted before fitting a mowing head

2

0414BA007 KN

NPosition the deflector against the gearbox so that the lug (3) engages the recess (4) in the deflector.

NInsert the screw (5) and tighten it down firmly.

002BA263 KN

WARNING

Deflector (2) is approved for grass cutting blades only and must therefore bemountedbeforefittingagrasscutting blade.

Mounting the Deflector

Deflectors (1) and (2) are both mounted to the gearbox in the same way.

English

Mounting the Cutting

Attachment

Laying down the machine

002BA342 KN

N Switch off the engine

NLay down the machine so that the mount for the cutting attachment faces upward

Fitting the Thrust Plate

The machine comes standard with the thrust plate.

1

002BA265 KN

NSlip the thrust plate (1) over the shaft (2).

NOTICE

The thrust plate on the gearbox is necessary for mounting cutting tools.

FS 70 R

19

English

Mounting Hardware for Cutting Attachments

The mounting hardware supplied depends on the cutting attachment that comes as original equipment with the new machine.

If mounting hardware is not packed with

machine

 

2

KN

 

002BA266

Only mowing heads may be used which mount directly to the shaft (2).

If mounting hardware is packed with machine

Mowing heads and metal cutting tools may be mounted.

3

4

5

002BA267 KN

The nut (3), rider plate (4) and thrust washer (5) are required to secure some mowing heads.

These parts are included in a kit supplied with the machine and are also available as special accessories.

Block the shaft.

NInsert the stop pin (7) or offset screwdriver (7) in the hole (8) in the gearbox as far as stop – and apply slight pressure.

NRotate shaft or cutting attachment until the stop pin slips into position and blocks the shaft.

Mounting the Cutting Attachment

WARNING

Use a deflector that matches the cutting attachment – see "Mounting the Deflector".

Fitting Mowing Head with Screw Mounting

Keep the instruction leaflet for the mowing head in a safe place.

 

2

 

8

 

KN

7

7

002BA166

 

 

The output shaft (2) must be blocked withthestoppin (7)orscrewdriver (7)to mount or remove cutting tools. These partscomestandardwiththemachineor are available as special accessories.

20

FS 70 R

1

002BA385 KN

NScrew the mowing head counterclockwise on to the shaft (1) as far as stop.

N Block the shaft.

NTighten down the mowing head firmly.

NOTICE

Remove the tool used to block the shaft.

Removing the Mowing Head

N Block the shaft.

NUnscrew the mowing head clockwise.

Mounting Metal Cutting Attachment

Keep the leaflet and packaging of the metal cutting tool in a safe place.

WARNING

Wear protective gloves to reduce the risk of direct contact with the sharp cutting edges.

Mount only one metal cutting attachment.

Check direction of rotation of cutting attachment

1

2

681BA108 KN

 

 

 

The cutting edges of the grass cutting blade (1) may point in either direction – this cutting attachment must be turned over regularly to reduce one-sided wear.

Cutting edges of grass cutting blade (2) must point clockwise.

WARNING

Direction of rotation is indicated by an arrow on the inside of the deflector.

 

English

9

 

7

 

 

6

8

4

 

5

 

681BA051 KN

NPlace the cutting attachment (4) on the thrust plate (5).

WARNING

Collar (see arrow) must engage the cutting attachment's mounting hole.

Securing the cutting attachment

NFit the thrust washer (6) – convex side must face up.

N Fit the rider plate (7).

N Block the shaft (8).

NScrewthemountingnut (9)ontothe shaft counterclockwise and tighten it down firmly.

WARNING

If the mounting nut has become too loose, fit a new one.

FS 70 R

21

English

NOTICE

Remove the tool used to block the shaft.

Removing the Metal Cutting Attachment

WARNING

Wear protective gloves to reduce the risk of direct contact with the sharp cutting edges.

N Block the shaft.

NUnscrew the mounting nut clockwise.

NRemove cutting attachment and its mounting hardware from the gearbox – but do not remove the thrust plate (5).

22

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 and should not be used.

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

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.

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 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.

FS 70 R

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, not to exceed 30 days of storage. 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.

Fueling

Preparations

547BA045 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 personalinjuryfromescapinggasvapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly.

English

Opening the threaded filler cap

002BA447 KN

NTurn the cap counterclockwise until it can be removed from the tank opening.

N Remove the filler cap.

Refueling

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

Closing the threaded filler cap

002BA448 KN

N Position cap.

NTurn the cap clockwise as far as it will go and tighten it as securely as possible by hand.

FS 70 R

23

English

Fitting the Harness

The type and style of the harness depend on the market.

The use of the harness is described in thechapteron"ApprovedCombinations ofCuttingAttachment,Deflector,Handle and Harness".

Shoulder Strap

1

2

0414BA009 KN

N Put on the shoulder strap (1).

NAdjustthelengthofthestrapsothat the carabiner (2) is about a hand’s width below your right hip.

Harness

1

2

0414BA010 KN

N Put on the full harness (1).

NAdjustthelengthofthestrapsothat the carabiner (2) is about a hand’s width below your right hip.

Starting / Stopping the

Engine

Controls

3 1

2

KN

 

0414BA011

1 Throttle trigger lockout

2Throttle trigger

3Stop switch with Run and 0 = Stop positions. Press the stop switch to switch off the ignition – see "Functionofstopswitchandignition system".

Function of stop switch and ignition system

The ignition is switched off and the engine stopped when the stop switch is pressed. The stop switch returns automaticallytotheRunpositionwhenit is released: The ignition is switched on againaftertheenginestops–theengine is then ready to start.

24

FS 70 R

STIHL FS 70 R Instruction Manual

Starting the Engine

4 KN457BA046

NPress the manual fuel pump

bulb (P) at least five times – even if the bulb is filled with fuel.

Cold engine (cold start)

5

KN

 

547BA016

NPressinthechokelever (5)andturn it to g at the same time.

Warm engine (warm start)

547BA017 KN

NPressinthechokelever (5)andturn it to <at the same time.

Also use this setting if the engine has been running but is still cold.

Cranking

0414BA012 KN

NPlacetheunitontheground:Itmust rest securely on the engine support and the deflector.

NIffitted:Removethetransportguard from the cutting attachment.

To reduce the risk of accidents, check that the cutting attachment is not touching the ground of any other obstacles.

NMake sure you have a firm footing, either standing, stooping or kneeling.

NHold the unit firmly on the ground with your left hand and press down

– do not touch the throttle trigger, lockout lever or slide control.

NOTICE

Do not stand or kneel on the drive tube.

English

0414BA013 KN

NPull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull.

NOTICE

Do not pull out the starter rope all the way – it might otherwise break.

NDonotletthestartergripsnapback. Guideitslowlybackintothehousing so that the starter rope can rewind properly.

N Continue cranking until engine runs.

FS 70 R

25

English

As soon as the engine runs

0414BA014 KN

NPress down the throttle trigger lockout and open the throttle – the choke knob moves to the run position F. After a cold start, warm up the engine by opening the throttle several times.

WARNING

Make sure the carburetor is correctly adjusted. The cutting attachment must not rotate when the engine is idling.

Your machine is now ready for operation.

Stopping the Engine

NMovethestopswitchinthedirection of 0 – the engine stops – release the stop switch – it springs back to the run position.

Other Hints on Starting

Engine stalls in cold start position gor under acceleration

NMove the choke lever to <and continue cranking until the engine runs.

Engine does not start in warm start position <

NMove the choke lever to gand continue cranking until the engine runs.

If the engine does not start

N Check that all settings are correct.

NCheck that there is fuel in the tank and refuel if necessary.

NCheck that the spark plug boot is properly connected.

N Repeat the starting procedure. Fuel tank run until completely dry

NAfter refueling, press the manual fuel pump bulb (P) at least

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

NSet the choke lever to suit the engine temperature.

N Now start the engine.

Transporting the Unit

Using transport guard

Transport guards are available as special accessories.

681BA268 KN

The transport guard can be used for grass cutting blades up to a diameter of 230 mm.

Fitting the transport guard

681BA269 KN

681BA272 KN

26

FS 70 R

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