STIHL FS 88, 108 Owners Instruction Manual - stihlusa.com

STIHL FS BB, 7DBInstruction ManualOwner's Manual

AssemblingSafety PrecautionsOperating InstructionsMaintenance

Contents

Parts and Controls Starting 34 This manual contains warnings,- Version with Bike Handle 2 Adjusting Carburetor 37 operating and safety precautions for the- Version with Loop Handle 4 Operating Instructions 40 STIHL FS 88 and FS 108 brushcutters.- Version with Loop Handle and Checking Spark Plug 41 Pay special attention to the safetyStandoff Lever 4 Cleaning Air Filter 41 precautions outlined on pages 6 to 17.

Safety Precautions and Lubricating Gearbox 42 Allow only persons who understand thisWorking Techniques 6 Lubricating Drive Shaft 42 manual to operate your brushcutter.Selecting the Cutting Tool 18 Sharpening Cutting Tools To receive maximum performance andMounting the Bike Handle 20 - Grass Cutting Blade 230-4 43 satisfaction from your STIHL brush-Mounting loop Handle with - Grass Cutting Blade 230-8 44 cutter, it is important that you read andStandoff Lever 21 - Brush Knife 250 45 understand the maintenance and safetyMounting the Loop Handle - Circular Saw Blade 200 precautions before using your brush-- Version A 22 (chisel tooth) 46 cutter. Contact your STIHL dealer or the- Version B 23 - Circular Saw Blade 200 STIHL distributor for your area if you doMounting the Deflector 24 (scratcher tooth) 47 not understand any of the instructions in- Fitting stop 24 Replacing Starter Rope and this manual.Mounting the Cutting Tools 25 Rewind Spring 48- STIHL Supercut 2-2 26 Spark Arresting Screen in Warn ng!- STIHL Supercut 20-2 26 Muffler 51 Because a brushcutter is a high-speed- STIHL Autocut 25-2 26 Storing the Machine 51 cutting tool some special safety pre-- STIHL Autocut 30-2 26 Maintenance Chart 52 cautions must be observed to reduce- STIHL Autocut 24-2 27 Specifications 53 the risk of personal injury. Careless or- STIHL Polymatic 30-2 27 Special Accessories 55 improper use may cause serious or- STIHL Polycut 40-3 28 even fatal injury. Make shure your unit is- STIHL Fixed Line Head 28 equipped with the proper deflector,- Grass Cutting Blade 230 29 handle and harness for the type of- Brush Knife 250 29 cutting attachment being used. Always- Circular Saw Blade 200 30 wear proJ<.er eye protection.Fuel 31Fueling 32 STIHL's philosophy is to continuallyFitting the Harness 32 improve all of its products. As a result,

engineering changes and improve-ments are made from time to time. If the

Printed on chlorine-free paper operating characteristics or the appear-ance of your brushcutter differs fromthose described in this manual, pleasecontact your STIHL dealer for informa-

© 1996 Andreas Stihl. Waiblingen 100813970 STIHL® tion and assistance.0458 357 3021. M 5. C 6 S Printed in Japan

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Parts and Controls

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Version with Bike Handle

1 = Handle support2 = Throttle trigger3 = Slide control4 = Throttle trigger interlock5 = Bike handle6 = Throttle cable retainer7 = Carrying loop8 = Throttle cable / stop switch wire9 = Spark plug terminal

10 = Air filter cover11 = Choke lever12 = Machine support

13 = Fuel tank14 = Fuel filler cap15 = Starter grip16 = Carburetor adjusting screws17 = Muffler

18 = Deflector (for all cuttingtools, without skirt)

19 = Metal cutting Itool(cutting blade 230)

Definitions 8. Throttle cable/stop switch wire. 16. Carburetor adjusting screws.Connect operator's control grip to For tuning carburetor.

1. Handle support. the powerhead.Connects the drive shaftto the handle bars. 17. Muffler.

9. Spark plug terminal. Attenuates exhaust noisesConnects the spark plug to the and diverts exhaust gases away

2. Throttle trigger. ignition wire. from operator.Controls the speed of the engine.

10. Air filter cover. 18. Deflector.3. Slide control. Covers the air filter element. The deflector is designed to reduce

Starting throttle lock and stop switch. the risk of injury from foreign objectsKeeps the throttle partially open flung backwards toward the operatorduring starting and switches the 11. Choke lever. by the cutting tool and from contactengine's ignition off and stops the Eases engine starting with the cutting tool.engine. by enriching mixture.

19. Cutting tool.4. Throttle trigger interlock. 12. Machine support. The cutting attachment, i. e. blade,

Must be depressed before the For resting machine on the ground. made from metal for different pur-throttle trigger can be activated. poses (special accessory).

13. Fuel tank.5. Bike handle. For fuel and oil mixture.

To hold the brushcutterwith both hands.

14. Fuel filler cap. .......>

For closing the fuel tank.6. Throttle cable retainer.

Fixes the throtlle cableon the drive shaft. 15. Starter grip.

The grip of the pull starter,which is the device to start

7. Carrying lOop. the engine.The device to connect thebrushcutler to the harness.

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Version with Loop Handle and loophandle with standoff lever

1 = Loop handle2 = Standoff lever3 = Carrying loop

(not all markets)4 = Slide control5 = Throttle trigger6 = Throttle trigger interlock7 = Throttle cable / stop switch wire8 = Spark plug terminal9 = Air filter cover

10= Choke lever11 = Machine support

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17

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12 = Fuel tank13 = Fuel filler cap14 = Starter grip15 = Carburetor adjusting screws16 = Muffler

17 = Deflector (for mowing heads)18 = Line limiting blade19 = Cutting tool

Definitions 8. Spark plug terminal. 16. Muffler.Connects the spark plug to the Attenuates exhaust noises

1. Loop handle. ignition wire. and diverts exhaust gases awayFor easy control of from operator.machine during cutting work. 9. Air filter cover.

Covers the air filter element.17. Deflector.

2. Standoff lever. The deflector is designed to reduceHelps keep unit at a safe distance 10. Choke lever. the risk of injury from foreign objectsfrom operator's feet and legs. Eases engine starting flung backwards toward the operator

by enriching mixture. by the cutting tool and from contactwith the cutting tool.

3. Carrying loop.The device to connect the 11. Machine support.brushcutter to the harness. For resting machine on the ground. 18. Line limiting blade.

Metal blade at the deflector in orderto keep the line of the mowing head

4. Slide control. 12. Fuel tank. at the proper length.Starting throttle lock and stop switch. For fuel and oil mixture.Keeps the throttle partially openduring starting and switches the 19. Cutting tool.engine's ignition off and stops the 13. Fuel filler cap. The cutting attachment, i. e. cuttingengine. For closing the fuel tank. head, for different purposes

(special accessory).

5. Throttle trigger. 14. Starter grip.Controls the speed of the engine. The grip of the pull starter,

which is the device to start ....,.the engine.

6. Throttle trigger interlock.Must be depressed before thethrottle trigger can be activated. 15. Carburetor adjusting screws.

For tuning carburetor

7. Throttle cable/stop switch wire.Connect operator's control grip tothe powerhead.

5

Safety Precautions andWorking Techniques

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Because a brushcutter is, a high-speed, fast-cutting• power tool, special safety

precautions must be obseNed to reducethe risk of personal injury.

It is important that youread, fully understandand obseNe the followingsafety precautions and

warnings. Read the owner's manual andthe safety instructions periodically. Careless or improper use of any brushcuttermay cause serious or fatal injury.

Have your STIHL dealer show you howto operate your brushcutter. ObseNe allapplicable local safety regulations,standards and ordinances.

Warning!The use of any brushcutter may behazardous. If the rotating cutting 1001comes in contact with your body, it willcut you. When it comes in contact withsolid foreign objects such as rocks orbits of metal, it may fling them directly orby ricochet in the direction of bystandersor the operator.

Striking such objects could damage thecutting attachment and may causeblades to crack, chip or break.STIHL does not recommend the use ofrigid blades when cutting in stony areas.Thrown objects or damaged blades mayresult in serious or fatal injury to theoperator or bystanders.

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Warning!Minors should never be allowed to usea brushcutter. Bystanders, especiallychildren, and animals should not beallowed in the area where a brushcutteris in use.

Never let the brushcutter run unattended.

Warning!Do not lend or rent your brushcutterwithout the owner's manual. Be surethat anyone using your brushcutter understands the information contained inthis manual.

Most of these safety precautions andwarnings apply to the use of all STIHLbrushcutters. Different models may havedifferent parts and controls. See theappropriate section of your owner'smanual for a description of the controlsand function of the parts of your modelbruShcutter.

Safe use of a brushcutter involves1. the operator2. the brushcutter3. the use of the brushcutter.

THE OPERATOR!

Physical Condition

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

Be alert - if you get tired while operatingyour brushcutter, take a break.Tiredness may result in loss of control.Working with any brushcutter can bestrenuous. If you have any condition thatmight be aggravated by strenuous work,check with your doctor before operatinga brushcutter.Prolonged use of a brushcutter (or othermachines) exposing the operator tovibrations may produce whitefinger disease (Raynaud's phenomenon) or carpal tunnel syndrome. These conditionsreduce the hand's ability to feel and regulate temperature, produce numbnessand burning sensations and may causenerve and circulation damage and tissuenecrosis.

WarnlnglAntivibration systems do not guaranteethat you will not sustain whitefinger disease or carpal tunnel syndrome.Therefore, continual and regular usersshould monitor closely the condition oftheir hands and fingers. If any of theabove symptoms appear, seek medicaladvice immediately.

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Proper Clothing

(i Warning!Brushcutter operation can

0·0 cause serious injury to eyes,ears and person. The de

flector provided with your brushcuttermay not protect the operator from allforeign objects (gravel, glass, wire, etc.)thrown by the wheeling cutting attachment. Thrown objects may also ricochetand strike the operator. Therefore, to reduce the risk of injury to your eyes neveroperate a brushcutter unless wearinggoggles or properly fitted safety glasseswith adequate top and side protectioncomplying with ANSI Z 87.1 (or your applicable national standard).

To reduce the risk of injury to your faceSTIHL recommends that you also weara face shield or face screen over yourgoggles or safety glasses.WarnIng!Brushcutter noise may damage yourhearing. Wear sound barriers (ear plugsor ear mufflers) to protect your hearing.Continual and regular users should havetheir hearing checked regularly.

Wear proper protective clothing.Protect your hands with gloves whenhandling the brushcutter and the cuttingtooi. Heavy-duty, nonslip gloves improveyour grip and protect your hands.

Clothing must be sturdy and snug·fitting,but allow complete freedom of movement. Avoid loose-fitting jackets, scarfs,neckties, jewelry, flared or cuffed pants,unconfined long hair or anything thatcould become caught on branches,brush Of- moving parts of the unit. Wearlong' pants made of heavy material toprotect your legs. Do not wear shorts.

Good footing is most important inbrushcutter work. Wear sturdy bootswith nonslip soles. Steel-toed safetyboots are recommended. Wear anapproved safety hard hat to reduce therisk of injury to your head when there isa danger of head injuries.

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Warning'Never modify a brushcutter in any way.Only attachments supplied by STIHL orexpressly approved by STIHL for usewith the specific STIHL brushcuttermodels are authorized. Although certainunauthorized attachments are useablefor the STIHL brushcutter, their usemay, in fact, be extremely dangerous.

THE USE OF THE BRUSHCUTIER

For illustrations and definitions of thebrushcutter parts see the chapter on"Parts and Controls"!

THE BRUSHCUTIER

Transporting the brushcutterWarning!Always turn off the engine and makesure the cutting attachment has stopped before putting a brushcutter down.When transporting your brushcutter in avehicle, properly secure it to preventturnover, fuel spillage and damage tothe brushcutter. Keep metal cuttingtools covered with the transport guard(optional accessory).

Preparation for the use of thebrushcutterAdjust carrying harness and hand gripto suit your size before starting work.The machine should be properlybalanced as specified in your owner'smanual for proper control and lessfatique in operation.

Always check your bruhcutter forproper condition and operation beforestarting, particularly the throttle trigger,throttle trigger interlock (if applicablestop switch, cutting tool, deflector andharness.

Arrows on the deflector (A) and stop (8)show the correct direction of rotation ofthe cutting tool.

The throttle trigger must move freelyand always spring back to the idleposition.The cutting tool must beproperly tightened and in safe operatingcondition. Inspect for loose parts (nuts,screws, etc.) and for cracked, bent,warped or damaged blades.

Fueling

Your STIHL brushcutter uses an oilgasoline mixture for fuel (see the chapter on "Fuel" of your owner's manual).

Warning!

Gasoline is an extremely flammable fuel.Ir spilled or ignited by a spark or otherignition source, it can cause fire andserious burn injury or property damage.Use extreme caution when handlinggasoline or fuel mix.

Do not smoke or bring any fire or flamenear the fuel.

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Fueling Instructions

Fuel your brushcutter in well-ventilatedareas, outdoors.

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Gasoline vapor pressure may build upinside the gas tank of a two cycle enginedepending on the fuel used, the weathercondition, and the venting system of thetank. In order to reduce th risk ofpersonal injury from escaping gas vaporand fumes, remove the fuel filler cap onyour brushcutter carefully so as to allowany pressure build-up in the tank torelease slowly. Never remove fuel fillercap while engine is running. Select bareground for fueling and move at least 10feet (3 m) from the fueling spot beforestarting the engine. Wipe off any spilledfuel before starting your brushcutter andcheck for leakage.

. arnmg!Check for fuel leakage while refuelingand during operation. If fuel or oilleakage is found, do not start or run theengine until leak is fixed and spilled fuelhas been wiped away. If this happens,change your clothing immediately.

~Warning!

J1~'\ Unit vibrations can.( cause an Improperly

tightened fuel cap toloosen or come off andspill quantities of fuel. In order to reducerisk of fuel spillage and fire, tighten fuelcap by hand with as much force as

possible. The screw driver end of theSTIHL combination wrench or othersimilar tool can be used as an aid intightening slotted fuel caps.

Starting

Warning!Your brushcutter is a oneperson machine. Once started it may fling foreign objekts for a great distance.

To reduce the risk of eye and other injuryinsure that bystanders are at least 50feet (15 m) away. Stop the engine andcutting tool immediately if you areapproached. Start and operate yourbrushcutter without assistance. Forspecific starting instructions, see theappropriate section of your manual.Place the brushcutter on firm ground orother solid surface in an open area.Maintain a good balance and securefooting.

To reduce the risk of injury from loss ofcontrol, be absolutely sure that the cutting tool is clear of you and all otherobstructions and objects, including theground, because when the engine startsat starting-throttle, engine speed will befast enough for the clutch to engage andturn the cutting tool.

'-When you pull the starter grip, don'twrap the starter rope around your hand.Do not allow the grip to snap back, butguide the starter rope to rewind properly.Failure to follow this procedure mayresult in injury to hand or fingers andmay damage the starter mechanism.

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Before cutting, inspectthe area for stones, glass,pieces of metal, trash orother solid objects. The

cutting attachment could throw objectsof this kind.

~.To reduce the

. risk of injuryfrom thrownobjects andblade contact,

never operate a brushcutter without aproperly mounted deflector. Keep theskirt on the deflectors adjusted properlyat all times (see chapter on mounting thevarious cutting tools of your owner'smanual). Do not overreach. Keep properfooting and balance at all times.

Working Conditions

Operate and start your brushcutter onlyoutdoors in a ventilated area. Operatethe brushcutter under good visibilityand daylight conditions only. Workcarefully.

Always hold the brushcutter firmly withboth hands. Wrap your fingers tightlyaround the handles, keeping the handles cradled between your thumb andforefinger. Keep your hands in this position, to have your brushcutter under control at all times. Make sure your brushcutter handles and grip are in good condition and free of moisture, pitch, oil orgrease.

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Warningl

Never attempt to operate any brushcutter with one hand. Loss of control ofthe brushcutter resulting in serious orfatal injury may result.To reduce the risk of bodily injuryresulting from loss of control and contactwith the cutting tool, make sure your unif':is equipped with the proper handle anaharness for the type of cutting attachment being used (see chart in chapteron "Selecting the Cutting Tool").

Special care must be taken in slipperyconditions (wet ground, snow) and indifficult, over-grown terrain. Watch forhidden obstacles such as tree stumps,roots and ditches to avoid stumbling.

Waming'This brushcutter is normally to be usedat ground level with the cutting attachment parallel to the ground. Use of abrushcutter above ground level or withthe cutting attachment perpendicular tothe ground may increase the risk ofinjury, since the cutting attachment ismore fully exposed and the brushcuttermay be more difficult to control. Neveruse your brushcutter as a hedgetrimmer.

W mmg!When using rigid blades, avoid cuttingclose to fences, sides of buildings, treetrunks, stones or other such objectsthat could cause the brushcutter to kickout or could cause damage to theblade. STIHL recommends use of thenylon line heads or Polycut head forsuch jobs. In addition, be alert to anincreased possibility of ricochets insuch situations.

Do not operate using the startingthrottle lock as you do not have controlof the engine speed. See section of yourowner's manual on the proper use of theslide control.

If the cutting tool or deflector becomesclogged or stuck, always turn off theengine and make sure the cutting toolhas stopped, before cleaning. Grass,weeds, etc. should be cleaned off thecutting tool at regular intervals.

Warning!During CUlling, check the tightness andthe condition of the cutting tool atregular intervals. If the behavior of thetool changes, stop the engine immediately, and check the nut securingthe tool for tightness and the cutting toolfor cracks and damage.

Replace cracked, bent, warped, damaged or dull cutting tools immediately.Such tools may shatter at high speedand cause serious or fatal injury.

Warn'ng'A loose blade may cause the blade tovibrate, crack, break or come off thebrushcutter, which may result inserious or fatal injury. Make sure thatthe blade is properly tightened. Use thewrench supplied or one of sufficientlength to obtain the proper torque. If theblade loosens after being properlytightened, stop work immediately. Theretaining nut may be worn or damagedand should be replaced. Never useunauthorized parts to secure the blade.If the blade continues to loosen, seeyour STIHL dealer. Never use abrushculler with a loose blade.

Important adjustments

amlng'To reduce the risk of personal injury fromloss of control or contact with the running grass cutting blade, do not use agrass cutting blade with incorrect idleadjustment. At correct idle speed, thegrass cutting blade should not move.For directions to adjust idle speed, seethe appropriate section of your owner'smanual.

If you cannot set the correct idle speed,have your STIHL dealer check yourbrushcutter and make properadjustments or repairs.

Waming'Never touch a rotating cutting tool withyour hand or any part of your body. Itcontinues to rotate for a short periodafter the throttle trigger is released(flywheel effect).

Operating instructions

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o Improper use of any~ brush-cutter can

cause serious orfatal personal injury. Read, understandand follow all safety instructions in yourowner's manual before operating theseproducts. To reduce the risk of personalinjury to the operator from blade contactand thrown objects, make sure yourunit is equipped with the proper deflector, handle and harness for the typeof cutting attachment being used ( seechart in chapter on "Selecting the Cutting Tool"). Always wear proper eye protection.

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Do not cut any material other thangrass, brush and wood. The cuttingtools may be used only for theoperations described in your manual.

With the engine running, attach thebrushcutter to the spring hook of yourharness (see appropriate chapter of thismanual).

USING THE CUTTING TOOLS

For an illustration of the various cuttingtools and instructions on proper mounting see the chapter on "mounting thecutting tools" in your owner's manual.

Using the mowing heads

The STIHL Supercut, Autocut, Polymaticand Polycut mowing heads produce aclean and tidy finish.

They are to be used only on brushcutters equipped with a chopper blade inthe deflector in order to keep the line atthe proper length (see "Parts andControls" chapter of this manual).

If the lawn edges are planted with treesor bordered by a fence etc.. it is best touse a nylon line head. It achieves a"softer" cut with less risk of damagingtree bark than with the polymer blades.

However, the polymer bladed STIHL"Polycut" produces a better cut if there

are no plants along the edge of the lawn.Sharpening is not necessary and worncutting blades are easily replaced.

Warnmg!To reduce the risk of serious injury.never use wire or metal-reinforced line

"':-- or other material in place of the nyloncutting lines. Pieces of wire could breakoff and be thrown at high speed towardthe operator or bystanders.

STIHL "Supercut" mowing headFresh line is advanced automatically.Frayed line is replaced by a simpleadjustment (see instruction sheetsupplied with mowing head).

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STIHL "Polymatic" mowing headFrayed line is replaced by a simpleadjustment (see instruction sheetsupplied with mowing head).

STIHL "Autocut" mowing headNylon cutting cord advances automatically when tapped against the ground.

STIHL "Polycut" mowing head

Important!Three rectangular wear limit marks areapplied to the base (periphery) of thePolycut. To reduce the risk of seriousinjury from breakage of the head orblades, the Polycut must not be used

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when it has worn as far as one of thesemarks. It is important to follow themaintance instructions supplied withthe head!

Using the grass cutting blade

All kinds of grass and weeds can beeasily cut with the cutting blade. Thebrushcutter is swept in anarcsimiliar to a scythe.

WarmnglTo reduce the risk of serious or fatalinjury never attempt to cut woodymaterials.

The 4-tooth grass cutting blade isintented to cut grass and weeds.It has 4 cutting knives with cutting edgeson both sides, i.e. front and rear.

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

'-Both bjades have to be resharpenedwhen all cutting edges are dull.

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Using the brush knife

When fitted to the brushcutter, thebrush knife is suitable for applicationsranging from cutting matted grass toclearing weeds, wild growth and scrub.

To cut wild growth and scrub, lower therotating brush knife down onto thegrowth to achieve a chopping effect.Use the brushcutter like a scythe to cutgrass, i.e. sweep it to and fro in an arc.

Warning!When cutting woody materials, use theleft side of the blade to avoid "kickout"(blade thrust) situations.

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Warnlngl

Improper use of a brush knife maycause it to crack, chip or shatter. Thrownparts may seriously injure the operatoror bystanders. To reduce the risk ofpersonal injury it is essential to take thefollowing precautions:Avoid contact with hard or solid foreignobjects such as stones, rocks or piecesof metal.Never cut wood or shrubs with a stemdiameter of more than 2cm (3/4") -use a circular saw blade for such work.Inspect the brush knife at regular shortintervals for signs of damage. Do notcontinue working with a damaged brushknife. Resharpen the brush knife regUlarly (when it has dulled noticeably).

Warning!

When cutting young saplings or otherwoody materials up to 2cm (3/4") indiameter, use left side of the blade toavoid "kickout" situations (seeappropriate section in this manual). Donot attempt to cut woody material with alarger diameter, since the blade maycatch or jerk the brushcutter forward.This may cause damage to the blade orbrushcutter or loss of control of thebrushcutter, resulting in personal injury

To redUce the risk of serious injuryto the operator or bystanders by akickout, never use a circular saw bladeon a brushcutter with a loop handle.

by experienced operators with specialized training in use and control of thebrushcutter.

amlnglThe risk of kickout is highest whencutting in the darker shaded area. Toreduce the risk of kickout and resultinginjury, do not use this area of thecircular saw blade for cutting trees orshrubs. Special techniques using thelighter shaded areas of the blade to cutshrubs and trees should only be used

Before starting the cut, accelerate theengine up to full throttle. Perform cutwith uniform pressure. STIHL recommends that the circular saw blade beapplied to the right of the tree, usingthe non-shaded area of the blade.

Warning'In order to reduce the risk of injury fromthrown objects or from operatorcontact with the cutting tool, be sure toremount the standard deflector for allother u·ses.

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positioned against the tree during thecutting process. Inexperienced usersshould place the left side of the stopagainst the tree trunk before beginningto cut. This act will keep the brushcutter against the tree during thecutting operation and will reduce therisk of loss of control and possiblekickout (described in the followingsection).

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Using the circular saw blade

Circular saw blades are suitable forthinning brush and cutting small trees upto a diameter of 7 cm (23/4 in). Do notattempt to cut trees with largerdiameters, since the blade may catch orjerk the brushcutter forward. This maycause damage to the blade or loss ofcontrol of the brushcutter which mayresult in serious injury.

When the brushcutter with circular sawblade is used to cut down small trees,STIHL recommends that the standarddeflector be removed and replaced bythe special "stop" (see chapter "circularsaw blade" for mounting instructions).This stop helps to keep the brushcutter

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Risk of "kickout" (blade thrust)with all rigid cutting blades

Warningl

Kickout (blade thrust) is the sudden anduncontrolled motion towards the operator's right or rear that can occur whenthe shaded area of the rotating bladecomes in cont<;:lct with a solid object likea tree, rock, bush or wall. The rapid counterclockwise rotation of the blade maybe stopped or slowed, and thecutting attachment may be thrown in anarea to the right or to the rear.

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This kickout (blade thrust) may causeloss of control of the brushcutter andmay result in serious or fatal injury to theoperator or bystanders. To reduce therisk, extreme caution should be usedwhen cutting with the shaded area ofnay rigid blade and never use a rigidblade on a brushcutter with a loophandle.

MAINTENANCE, REPAIR ANDSTORING

Use only identical STIHL replacementparts for maintenance and repair.Use of parts manufactured by othersmay cause serious or fatal injury.

Follow the maintenance and repairinstructions in the appropriate section ofyour owner's manual. Please refer to themaintenance chart at the last pages ofthis manual.

arnmglAlways stop the engine and make surethat the cutting tool is stopped before doing any maintenance or repair work orcleaning the brushcutter. Do not attemptany maintenance or repair work notdescribed in your owner's manual. Havesuch work performed at yourSTIHLservice shop only.

Never repair damaged cutting attachments by welding, straightening ormodifying the shape. This may causeparts of the cutting tool to come off andresult in serious or fatal injuries.

Check condition of culling tool at regularshort intervals. If behavior of toolchanges, check it immediately fortightness or any signs of cracks in particular. Replace damaged or dull cUllingtools immediately, even if they have onlysuperficial cracks. If the blade loosensafter being properly tightened, theretaining nut may be worn or damagedand should be replaced. If the bladecontinues to loosen, see your STIHLdealer. Do not attach any blade to a unitwithout proper installation of all requiredparts. Never use unauthorized parts tosecure the blade. Failure to use theproper parts may cause the blade to flyoff and seriously injure the operator orbystanders.

Check fuel filler cap for leaks at regularintervals. Use the specified spark plugand make sure it and the ignition leadare always in good condition.Warning!Do not operate your brushcutter if themuffler is damaged, missing or modefied. An improperly maintained mufflerwill increase the risk of fire and hearingloss. Never touch a hot muffler or burnwill result. If your muffler was equippedwith a spark-arresting screen to reducethe risk of fire (e.g. in the USA, Canadaand Australia), never operate your hedgetrimmer if the screen is missing or damaged. Remember that the risk of forest fires is greater in hot or dry weather.

Warning!In order to reduce the risk of fire, do notmodify or remove any part of the muffleror spark arrestor.

Keep cutting tool sharp. Tighten all nuts,bolts and screws except the carburetoradjustment screws after each use.

Keep spark plug and wire connectiontight and clean. The spark plug electrodegap should be checked with a feelergauge at least every 50 operating hoursand reset if necessary. Fit a new sparkplug if the electrodes are badly pilled.

Store brushcutter in a dry, high or lockedlocation place and out of reach ofchildren.Before storing for longer than a fewdays, always empty the fuel tank.

WarnlnglKeep hands and feet away from cUllingtool.

17

Selecting the Cutting Tool

Cutting tools:1 STIHL Supercut 20-1 mowing head

(FS 74 only)2 STIHL Supercut 20-2 mowing head3 STIHL Autocut 20-2 mowing head

(FS 74 only)4 STIHL Autocut 24-2 mowing head5 STIHL Autocut 25-2 mowing head6 STIHL Autocut 30-2 mowing head7 STIHL Polymatic 30-2 mowing head8 STIHL Polycut 20-3 mowing head9 STIHL Fixed Line head

10 Grass Cutting blade 230-411 Grass Cutting blade 230-812 Brush knife 250

13 Circular saw blade 200(scratcher tooth)

14 Circular saw blade 200(chisel tooth)

Deflectors:15 Deflector for mowing heads16 Deflector for all cutting tools

with17 Skirt and line limiting blade18 Deflector for all cutting tools

without skirt and line limiting blade19 Stop for circular saw blades

Handles:20 Loop handle21 Loop handle with22 Standoff lever23 Bike handle

18

Carrying straps:24 Shoulder strap recommended25 Shoulder strap26 Full harness recommended27 Full harness

A fully equipped brushcutter comprises,among other items:

- Cutting tool- Deflector- Handle- Carrying strap

Select the correct combination fromthe table according to the cutting toolyou intend to use:

For safety reasons, you may only combine the cutting tool, deflector, handle andcarrying strap versions shown when youread the table horizontally from left toright

Other combinations, e.g. reading thetable diagonally, are not permittedsince there is otherwise a risk of ':-serious injury.

Warning'

STIHL brushcutters with a loop handlewithout standoff lever may be usedonly with the above-mentioned mowingheads with nylon line or plastic blades.

Other plastic or metal cutting tools mayonly be used on brushcutters with a bikehandle, "J"-handle or loop handle withstandoff lever in order to minimize therisk of personal injury through contactwith the cutting tool.

Cutting tools Deflectors Handles Carrying straps

2

0 20~~---'

15

34~ 21

~~ -

5 6 22 24

16

7 823

V~l

t-J (e' 'C(~..... -

925

10 11 21

~) -:1 -- \ 18

~.~ --..../J 22

1223

VA I...." 25 26

19

~13 14

~23 V0 (:) =

27

19

Mounting the Bike Handle

12

11

12

3 3,4 i

I I I I

~5

~8

6§

J7

.10

The handle support (2) is mounted onthe drive tube (1).• Take out the 4 screws (3)

remove the clamp (4).• Place the bike handle (5) in the and

position the clamp (4) on the handlesupport.

• Line up holes in clamp andhandle support.

• Insert the screws as far as stop.• Line up the bike handle.• Tighten the screws firmly.

Fitting the control handle

• Remove the screw (6)from the nut (7).

• Take both parts out of thecontrol handle (8).

• Push the control handleonto the bike handle (5) throttle trigger (9) mustpoint in direction of gear head.

• Line up the holes (10).• Fit nut and screw in the

control handle.• Tighten the screw firmly.

Fitting the throttle cable

Do not kink the throttle cable- make sure the throttle triggermoves freely.

• Push the throttle cable (11)iAto the retainers (12).

20

Mounting Loop Handle withStandoff Lever

~-A-

,......,

1~

~. 0~

02 r~

c.2..~

• Mount the loop handle (1) withstandoff lever 20 cm/8" (A) forwardof the control handle (2).

3 3[] []

oJ -lII

1 1 --1 I

I I 4 I IlQJ lQj

I~ <:¢fIlII! 413 3

• Insert square nuts (3) in thestandoff lever (4) -line up the holes.

( 4

On FS 108

• Place the clamp (5) in the loophandle (1) and position them bothagainst the drive tube (6).

• Fit the clamp (7) and place standofflever (4) in position -line up the holes.

• Ir)self screws (8) in holes andscrew them into standoff leverfingertight.

• Align the loop handle.• Tighten the screws firmly.

21

4

On FS 88

• Place the clamp (5) in the loophandle (1).

• PlaE:e packing sleeve (7)on the drive tube (6).

• Fit the clamp (8) and place standofflever (4) in position -line up the holes.

• Insert screws (9) in holes andscrew them into standoff leverfingertight.

• Align the loop handle.• Tighten the screws firmly.

22

Mounting the Loop HandleVersion A

At;)A

1

o

o

• Mount the loop handle (1)20 cm/8" (A) forward of thecontrol handle (2).

On FS 108

• Place the clamp (3) in the loophandle (1) and position them bothagainst the drive tube (4)

• Fit the clamp (5) line up the holes.

• Insert screws (6) in holes and~. screw on the nuts (7) fingertight.

• Align the loop handle.• Lock the nuts and tighten

the screws firmly.

~0 34 5

~68 ([JJ ([JJ 8

On FS 88


• Place packing sleeve (5)on the drive tube (4).

• Fit the clamp (6) line up the holes.

• Insert screws (7) in holes andscrew on the nuts (8) fingertight.

• Align the loop handle.• Lock the nuts and tighten

the screws firmly.

Mounting the Loop HandleVersion B

• Mount the loop handle (1)20 cm/8" (A) forward of thecontrol handle (2).


On FS 88

• Place packing sleeve (5)on the drive tube (4).

"'-

On FS 108• Place both parts on the

drive tube (4).

• Fit the clamp (6) and make surethat the holes line up.

• Insert the screws (7) as far as stop.• Line up the loop handle and

tighten the screws firmly.

23

Mounting the Deflector

1

3~4

Mounting the deflector

• Place either deflector (1) for allcutting toolsordeflector (2) for mowing headson the gearhead flange.

• Fit the plate (3) and line it up.

• Insert M 5 x 18 screws and tightendown securely.

24

Fitting skirt and blade

• Slide the lower guide slot of theskirt (4) over the deflector (1) -it must snap into position.

• Push blade (5) into the upper gUideon the skirt and line it up with thefirst hole.

• Fit the screw and tighten it downfirmly.

Fitting stop -for circular saw blades

• Remove standard deflector.Place the stop (1) on the gearhead flange - fit the threeM 5 x 18 screws (2) providedand tighten down securely.

Mounting the Cutting Tools

8

6 \f

\

\

1 t

[

• Lay your brushcutter on its backwith the gear head facing up.

Blocking the output shaft

• Insert stop pin (1) in the bore (2) atthe side of the gear head as far asstop - apply slight pressure.

• Rotate output shaft until the stoppin slips into position and blocks theshaft.

Removing cutting tool mountinghardware

• Position combination wrench (3)on the mounting nut (4).

• Release and unscrew the nutclockwise (left-hand thread).

• Remove shipping keeper (5) if fitted.

• Pull the rider plate (6) andthrust washer (7) offthe shaft (8).

• Now fit the cutting tool.

25

STIHL Supercut 2-2STIHL Supercut 20-2


• Screw mowing head counterclockwise onto the output shaft (1) -as far as it will go.

• Block the output shaft.• Tighten down the mowing head

securely.Important!Remove the stop pin.

Keep instruction sheet for mowinghead in a safe place.

26

Removing mowing head

• Block the output shaft.• Unscrew mowing head clockwise.

Adjusting nylon line

• Fresh line is advanced automatically, providing at least6cm/2.4" of line is still projectingfrom the head.Blade on deflector trims surplus lineto correct length.

• Fit new nylon line as described ininstructions supplied with mowinghead.

STIHL Autocut 25-2STIHL Autocut 30-2• Lay your brushcutter on its back

with the gear head facing up.• Screw mowing head counterclock

wise onto the output shaft (1) -as far as it will go.

• Block the output shaft.--. Tighten down the mowing head


Removing mowing head• Block the output shaft.• Unscrew mowing head clockwise.



• Hold the rotating mowing headhorizontal above the ground tap it on the ground -about 3cm/1 1/4" fresh line isadvanced - blade on deflector trimssurplus line to the correct length avoid tapping head more thanonce.

• Line feed operates only if both linesstill have a minimum length of2.Scm/1".

• Fit new nylon line as described ininstructions supplied with mowinghead.

c;- 21

34

"cI~

STIHL Autocut 24-2STIHL Polymatic 30-2


• Slip the plain washer (1) andthrust washer (2) over theshaft (3) and against thethrust plate (4).

• Screw mowing head counterclockwise onto the output shaft -as far as it will go.

• Block the output shaft.• Tighten down the mowing head



Removing mowing head

• Block the output shaft.• Uns.f.rew mowing head clockwise.


• Refer to instruction sheet suppliedwith mowing head.

27

1

~4-= 2

STIHL Polycut 40-3 STIHL Fixed Line Head

••••••

Lay your brushcutter on its backwith the gear head facing up.Remove ring (1) from the mowinghead.Position the head on the thrustplate (2).Slip the thrust washer (3) over theoutput shaft (4).Block the output shaft.Screw mounting nut (5) counterclockwise on to the output shaft andtighten it down firmly.Important!Remove the stop pin.

Releasing mounting nut

• Block the output shaft andunscrew the mounting nutclockwise.

If the mounting nut becomes slack dueto frequent loosening and retightening,fit a new one.

Replacing cutting blades

• Refer to instruction sheet suppliedwith fixed line head.

•••

....,. .•

Lay your brushcutter on its backwith the gear head facing up.Place mowing head on the thrustplate (1).Slip the thrust washer (2)over the output shaft (3).Block the output shaft.Screw mounting nut (4) counterclockwise on to output shaft andtighten down securely.

Important!Remove the stop pin.


28


tl


• Block the output shaft.• Unscrew the mounting nut

clock wise.

If the mounting nut becomes slack dueto frequent loosening and retightening,fit a new one.

Fitting nylon line

• Refer to instruction sheet suppliedwith fixed line head.

Grass cutting blade 230Brush knife 250

Note: Remove skirt and blade fromdeflector before mounting thesecutting tools.


• Place cutting tool (1) on the thrustplate (2).

• Cutting edges of blade 230-8 (3)must point clockwise.

• Cutting blade 230-4 (4) and brushknife (5) may be fitted either wayround.

• Slip the thrust washer (6)and rider plate (7) overthe output shaft (8).

• Block the output shaft.• Screw mounting nut (9) counter

clockwise on to output shaft andtighten down securely.Important!Remove the stop pin.

Releasing mounting nut• Block the output shaft.• Unscrew the mounting nut

clockwise.If the mounting nut becomes slack dueto frequent loosening and retightening,fit a new one.

29

@8

[ \6::==::..., 5

37

4

Circular saw blade 200(chisel and scratcher tooth)

Fit the appropriate stopbefore mounting circular saw blade.

Fitting the stop see chapter "Mountingthe Deflector".

30

Mounting circular saw blade


• Position saw blade (3) onthe thrust plate (4) -teeth must point in clockwisedirection.

• Slip the thrust washer (5)and rider plate (6) overthe drive shaft (7).

• Block the drive shaft.• Screw mounting nut (8)

counterclockwise on todrive shaft and tighten downsecurely.


• Block the drive shaft andunscrew the mounting nutclockwise.

If the mounting nut becomes slack dueto frequent loosening and retightening, fita new one.

Fuel

Your two-stroke engine requires amixture of brand-name gasoline andquality two-stroke engine oil with theclassification Te.Use regular branded unleaded gasolinewith a minimum octane number of90 ROZ (U.S.A./Canada: pump octanemin. 89!). If the octane number of theregular grade gasoline in your area islower us5=l premium unleaded fuel.Fuel with a lower octane number mayresult in preignition (causing pinging")which is accompanied by an increase inengine temperature. This, in turn,increases the risk of the piston seizureand damage to the engine.

The chemical composition of the fuel isalso important. Some fuel additives notonly detrimentally affect elastomers(carburetor diaphragms, oil seals, fuellines etc.), but magnesium castings aswell. This could cause running problemsor even damage the engine. For thisreason it is essential that you use onlyname branded fuels!

Use only STIHL two-stroke engine oil orequivalent branded two-stroke air-cooledengine oils with the classification TC formixing.We recommend STIHL 50:1 two-strokeengine oil since it is specially formulatedfor use in STIHl engines. The mix ratiowith STIHl oil is 50:1 (50 parts gasolineto 1 part oil), or 25:1 (25 parts gasoline to1 part oil) with other branded two-strokeair-cooled engine oils.

Do not use BIA or TCW (two-strokewater cooled) mix oils!Take care when handling gasoline.Avoid direct contact with the skin andavoid inhaling fuel vapour.The canister should be kept tightlyclosed in order to avoid any moisturegetting into the mixture.The fuel tank and the canister in whichfuel mix is stored should be cleanedfrom time to time.

Fuel mix ages:Only mix sufficient fuel for a few dayswork, not to exceed 30 days of storage.Store in approved safety fuel-canistersonly. When mixing, pour oil into thecanister first, and then add gasoline.

Gaso- STIHL Other brandedline engine oil TC oils

50:1 25:1Liters Liters (cc) Liters (cc)

1 0.02 (20) 0.04 (40)5 0.10 (100) 0.2 (200)

10 0.20 (200) OA (400)15 ",:-0.30 (300) 0.6 (600)20 OAO (400) 0.8 (800)25 0.50 (500) 1.0 (1000)

Gaso- STIHL Other brandedline engine oil TC oils

50:1 25:1US gal. US fl.oz US fl.oz

1 2.6 5.121/2 6A 12.85 12.8 25.6

31

Fueling Fitting the Harness

Before fueling, clean the filler cap andthe area around it to ensure that no dirtfalls into the tank.Always thoroughly shake the mixture inthe canister before fueling your machine.

Change the fuel pick up body every year.

Before storing your machine for a longperiod, drain and clean the fuel tank andrun engine until carburetor is dry.

Models with a loop handle come withouta harness (available as special accessory for these models).

Shoulder strap

Use of the carrying strap is describedin chapters "Safety Precautions" and"Selecting the Cutting Tool".

Warning! In order to reduce the risk ofbums or other personal injury from escaping gas vapor and fumes, remove thefuel filler cap carefully so as to allow anypressure build-up in the tank to releaseslowly.

Warning' After fueling, tighten fuel capas securely as possible by hand.

32

•...., .Put on the shoulder strap (1).Adjust length until the springhook (3) rests against your right hip.

Full harness

• Put on the full harness (2).• Adjust length until the spring

hook (3) rests against your right hip.

Use of the carrying strap is describedin chapters "Safety Precautions" and"Selecting the Cutting Tool".

Balancing the brushcutter

• Attach the spring hook (3) tothe clamp (4) on the drive shaft slacken the screw (5).

• Slide the clamp up or downthe drive shaft.

• Tighten the screw moderately.

• Let go of the brushcutter and checkto see how it is balanced:mowing heads, Fixed Line Headandbrush knife must rest lightly on theground.Circular saw blades must stayabottt 30cm/1 ft (A) clear of theground.

• Tighten the screw firmly.

33

Starting

1

• Observe safety precautions - seesection "Safety Precautions" in thismanual.

• Hold down the throttle triggerinterlock (1) and squeezethe throttle trigger (2).

• Move the slide control (3)to START position.

• Now release the throttle trigger, slidecontrol and trigger interlockin that order = This is thestarting-throttle position.

34

If engine is cold:Set the choke lever (4) to .L

If engine is warm:Set the choke lever (4) to ...

Also use this setting il engine has beenrunning but is still cold.

• Put the unit on the ground:It must rest securely on the enginesupport and deflector. Check thatthe cutting tool is not touching theground or any other obstacles.

• Make sure you have a firmlooting: Hold the unit with you lefthand and press it down firmly your thumb should be under thehousing.

• Do not stand or kneel on the driveshaft!

~oo~(( \\3))

2

• Pull the starter grip slowly with yourright hand until you feel it engage and then give it a brisk strong pull.Do not pull out starter rope morethan 70cm (27") - it might break.

Do not let the starter grip snapback - guide it slowly into thehousing so that the starter ropecan rewind properly.

When engine begins to fire:

If engine is cold:Set choke lever (4) to -and continue cranking until engine runs.

If engine is warm:Continue cranking until engine runs_

As soon as warm engine runs:

• Blip the throttle trigger (2) -the slide control (3) moves to therun position I, and the enginereturns to idling speed.

• Make~ure carburetor is correctlyadj,usted - cutting tool must notrotate when engine is idling.

Your brushcutter is ready foroperation.

35

To shut down engine:• Move slide control (3) to STOP.

At very low outside temperatures:Allow engine to warm up

As soon as engine runs:• Blip the throttle trigger-

the slide control (3) moves to therun position I, and the enginereturns to idling speed.

• Open throttle slightly -warm up engine for short period.

36

If the engine doesn't start:

If you did not move the chokelever to.Lquickly enough after the enginebegan to fire, the combustion chamberis flooded.

Remove spark plug terminal (5) -• Unscrew and dry off the

spark plug.• Set slide control to STOP.• Open the throttle fully.• Pull the starter rope several times to

clear the combustion chamber.

• Refit the spark plug and connectthe spark plug terminal.

• Set slide control to START.• Set choke lever to ...

even if engine is cold.• Now start the engine.

Fuel tank run until dry and thenrefueled

• Continue cranking -Engine will not start immediatelybecause fuel pump has to be primed with fuel.

Adjusting Carburetor

FS88{ I I FS 88

/ I I

t L /-1=1r L rB

I ~~ R I ~~~

IfF ~l~ 1~!I

L-!@~LAL....

~

FS 108I { I I

FS 108I , I

H L JJ~~ ~I-R~-

LD

The carburetor has been adjusted foroptimum performance under thebarometric pressure and climaticconditions at the factory.

Basic setting

This setting is the starting point for finetuning and can be used as thestandard setting.

• Check air filter and clean it ifnecessary.

• Carefully screw the high speedadjusting screw (H) and low speedadjusting screw (L) down onto theirseats (clockwise) and make thefollowing adjustments:

H Open 1 full turnL Open 1 full tum

• Start the engine and adjust idlingspeed with the idle speed adjustingscrew LA or LD:cutting tool must not rotate.

This standard setting is the optimumsetting of the high speed adjusting screwfor normal operation at an altitude ofabout 300 m/1000 It above sea level.It ensures your machine will delivermaximum power, be fuel efficient andoperate reliably.

It may be necessary fine-tune thecarburetorif operating conditions change,e.g. higher or lower altitudes, extremechanges in humidity and temperature orif you fit a different cutting tool:The fine tuning procedures describedbelow ensure maximum performanceunder t~enew operating conditions.

37

FS 88I , ,

FS88I ! ,

~H Iii H I r II~@,~ R , n~I ILL 1'-1 @ 1Pr=I-- II l-I I

------- ---FS 108 ( I , FS 108 ( I ,

Fine tuning

• Mount the cutting tool.

Machines with cutting head:

• Trim line to correct length:Lines must extend as far as linelimiting blade on the deflector

• Carry out the basic setting.• Warm up engine by running it for

about 1 minute at full throttle andthen return to idle speed.

• Back off high speed adjusting screw(H) one half turn (counterclockwise).

• Run engine at full throttle and rotatehigh speed adjusting screw (H)carefully clockwise until you hear

38

no further increase in RPM back off screw one eighth turn.

Machines with metal cutting tool:

A tachometer is necessary for thefollowing adjustment.If no tachometer is available, .....,.do not turn screws beyond the basicsetting.

• Carry out the basic setting.• Warm up engine by running it for

about 1 minute at full throttle andthen return to idle speed.

• Back off high speed adjusting screw(H) one half turn (counterclockwise).

• Run engine at full throttle androtate high speed adjusting screw(H) carefully clockwise untilmaximum permissible speed of12,000 RPM is reached.

Turning the screw (H) any furtherin the clockwise direction willmake the fuel-air mixture toolean -this could damage the engine!

FS 88, , ,

L rHI@f;jI R

I I

Lj~

IiiL- LA~

FS88I I !

L rHI@f;jI R

I 117=1l-/~L- LA~

FS88( I I

L rH)@f;jR

I 117=l-/@L-I

------FS 108

( I IFS 108

( I IFS 108

( I I

Adjusting idle speed

It is usually necessary to changethe setting of the idle speedadjusting screw (LA or LD) after everycorrection to the low speedadjusting screw (L).

Engine stops while idling

Turn the idle speedadjusting screw (LA or LD)clockwise until engine runssmoothly - cuttingtool must not rotate.

Cutting tool rotates whenengine is idling

Turn the idle speed adjustingscrew (LA or LD) counterclockwiseuntil cutting tool stops rotating then back off screw aboutanother one half tum from thatposition.

Erratic idling behavior,poor acceleration

Idle setting is too lean.Turn the low speed adjustingscrew (L) counterclockwise untilengine runs and acceleratessmoothly.

Exhaust smokes at idle speed

Idle setting is too rich.Turn the low speed adjustingscrew (L) clockwise untilengine speed drops. Then turnscrew back one quarter turnand ch~k that engine stillacce'lerates smoothly whenyou open the throttle.

39

Operating Instructions

During break-in period

A factory new machine should not be runat high revs (full throttle off load) for thefirst three tank fillings. This avoids unnecessary high loads during the break-inperiod.

As all moving parts have to bed induring the break-in period, thefrictional resistances in the engineare greater during this period.The engine develops its maximumpower after about 5 to 15 tank fillings.

40

During operation

After long period of full-throttleoperation, allow engine to run for a whileat idling speed so that the heat in theengine can be dissipated by flow ofcooling air. This protects enginemounted components (ignition,carburetor) from thermal overload.

After finishing work

Storing for short period:To avoid condensation, fill the fueltank and keep the unit in a dry placeuntil you need it again.

Storing for a long period:Drain and clean the fuel tank run engine until carburetor is dry.

Check tightness of nuts and screws(not adjusting screws) at regularinteNals and retighten as necessary.

Checking Spark Plug Cleaning Air Filter

1

(~2---\(~'-=~=======* A ':58..:1Ilgo

If engine is down on power, difficultto start or runs poorly at idling speed,first check the spark plug.

• Remove spark plug -see "If engine doesn't start:"

• Clean dirty spark plug.• Check electrode gap -

it should be 0.5 mmlO.020" (A) readjust if necessary.

• Use only suppressed spark plugsof the approved type.

Rectify faults which have causedfouling of spark plug:Incorrect carburetor setting, too much oilin fuel mix, dirty air filter, unfavorablerunning conditions, e.g. operating atpart load.

• Fit a new spark plug afterapprox. 100 operating hours -

or earlier if the electrodes arebadly eroded. •

If there is a noticeable lossof engine power:

• Set choke lever to .L -• Grip tab (2) and pull the

filter cover (1) off the carburetor.• Clean away loose dirt from

around the filter.

41

Lubricating Gearbox Lubricating Drive Shaft

01 10

2

t5

3 4

• Remove the foam element (3) • Check grease level after about • Check film of lubricant onceand the felt element (4). every 50 hours of operation. a year.

• Wash the filter elements in fresh, • Unscrew the filler plug (1).non-flammable cleaning solution • If no grease can be seen on the insi- • Mark the end of the gear head on(e.g. warm soapy water) and then de of the filler plug, screw the tube the drive tube.dry. (2) of STIHL gear lubricant • Release the clamp screws (1).

0781 120 1117 into the filler hole. • Pull the gear head (2) off theReplace damaged parts of filter. • Squeeze grease into the gear drive tube.

housing - about 5 - 10 g (1/4 oz),

• Place the felt elementin the filter base (5) first and then Do not completely fill thethe foam element. gear housing with grease.

• Fit the filter cover (1) - it must snapinto position. • Refit the filler plug and tighten it

down firmly.

42

Sharpening Cutting Tools

D3 1':) 2(")

"'0«([Jr--

"'(")

o3

• Resharpen only when all cuttingedges (1) on both sides of theblade are dull: This ensuresbalanced wear.

Grass cutting blade 230-4

Never straighten or weld a bent orcracked cutting blade - it mightshatter and cause serious or fatal injury.

o

• Push shaft (3) into the drive tube tum it to and fro until distance A isless than 30mm (1.2").

• Slide the drive tube intothe gear head -turn drive shaft (4) back andforth until mark is reached.

• Line up the gear head.• Tighten down the clamp screws.

• If shaft has turned blue, fit anew one.

• Pull the shaft (3) out of the drivetube.

• Use STIHL multipurpose grease0781 120 1109 to coat dry areasof the shaft:Do not apply too much grease never pump grease into thedrive tube.

t~3

':)'""'0«([Jr--

"'(")

To avoid out-at-balance:• Resharpen the cutters (2)

uniformly - do not alter the contourof the parent blade (3) in any way.

• After resharpening about 5 times,have blade checked on STIHLbalancer 5910 850 2600 andrebalanced as necessary.

43

~A o

~c

m

B ~,---~-----a'i

:;:;..,

3

2=:JJ.......__4__

Sharpen correctly• If slightly dull:

Use flat file (4) 0814 212 3310In case of more serious wear ornicks: Resharpen with a grinder maintain a sharpening angle of30° (A) on the cutting edge (1).

• File back the cutting edgeparallel to the lines (B) (seeillustration).

• Resharpen frequently, takeaway as little material aspossible - two or three strokesof the file are usually enough.

44

Grass cutting blade 230-8

Never straighten or weld a bent orcracked cutting blade - it mightshatter and cause serious or fatal injury.

• Resharpen when the tips of thecutting edges (1) have worndown to about 1mm/3/64" (A).

To avoid out-of-balance:• Resharpen the cutters (2)

uniformly - do not alter the contourof the parent blade (3) in any way.

• After resharpening about 5 times,have blade checked on STIHLbalancer 5910 850 2600 andrebalanced as necessary.

Measurements and angles forresharpening

Leave clearance of 2mm/5/64" (B)between cutting edge and parentblade - R1 should be 2mm/5/64".Radius R2 is 2.5mmf7164" and isobtained automatically if you use thespecified file and maintain a filing angleof 30° (C).Cutting edge (0) must be exactly in linewith center of blade's mounting hole.

)J 4_-

2 2

Sharpen correctly

• If slightly dull:Use flat file (4) 0814 2123310In case of more serious wear ornicks: Resharpen with a grinder.

• File back the cutting edgeparallel to the lines (E)(see illustration).


Brush knite 250

Never straighten or weld a bent orcracked brush knife - it might shatterand cause serious or fatal injury.

• Only sharpen thecutting edges (1) at the pointedtips - do not sharpen curvedcutting edges (2) even if theyarenicked in places.

To avoid out-at-balance:• Resharpen cutting edges

uniformly -use the sharpening template0457 342 2629 provided.

• After resharpening about5 times, have blade checked onST-U::iL balancer 59108502600and rebalanced as necessary.

45

)n 3-

Sharpen correctly• If slightly dull: Use

flat file (3) 0814 212 3310-In case of more serious wear ornicks: Resharpen with a grinder maintain a sharpening angle of30 0 (A) on the cutting edge (1).

• File back the cutting edgeparallel to the lines on the sharpening template.


46

ayI !

~)I '--.-: -,-,I

\\

Circular saw blade 200 (chisel tooth)

Never straighten or weld a bent orcracked circular saw blade - it mightshatter and cause serious or fatal injury.

Sharpening circular sawblade on the unit

• Cut a vertical slit in thetop of a tree stump - lean the unitagainst the stump so that the sawblade rests in the slil.

• Turn the blade with one handwhile resharpening -Wear gloves!

Sharpen correctly• File only the side plate (1).• If slightly dull: Use

file holder (2) 5605 750 4343and matching 5.5mm dia.round file (3) 0811 411 8108.

l0 case of major or very irregular wear:Use an electric grinder.• File right and left-hand teeth

in the direction of sel.

5 4

B~

• File at the angle marked on the fileholder:Filing angle is 15° (A) file should slope upwardat an angle of 5° (B).


Resetting the teeth

If the saw blade does not cut freelyor binds in the cut:

Check set of teeth -• Hold the saw set (4) 4020 893 5000

against the saw blade (5) - if thereis a gap (C) between the tooth andsaw set: see "Resetting the teeth".

• If the tooth just touches the saw set:Clearance 0 is 1mm (3/64") and theset is correct.

Resetting correctly the teeth• Fit notch of saw set (4) over the

tooth (6) - blade thickness 1.5mm(about 1/16"). Maintain the angleof 90° (E) and keep to existingdirection of set.

• Push the saw set downward untilthe sloRing side (F) of the notch"',butts,against the saw blade.

• Check set of teeth again.

Circular saw blade 200(scratcher tooth)

Never straighten or weld a bent orcracked circular saw blade - it mightshatter and cause serious or fatal injury.

47

Replacing Starter Ropeand Rewind Spring

2 ~

0 05

'-60

]ID__2_-

Sharpen correctly• File only the back of the tooth (1).• If slightly dull: Use

flat file (2) 0814 212 3310.In case of more serious wear ornicks: Resharpen with a grinder until the tips (3) of the teeth arerestored to full sharpness.

• Resharpen frequently, take awayas little material as possible - two orthree strokes of the file are usuallyenough.

• Do not alter tooth profile.

Removing rewind starter

• Lay your brushculler on its backwith the gear head facing up.

• Remove the four screws (1) fromthe machine support (2) and lift itaway.

• Take out the screws (3).• Remove the starter cover (4)

together with rewind startermechanism.

Replacing a broken starter rope

• Take out the screw (5).• Remove the washer (6).• Remove the rope rotor very

carefully - the rewind spring isseated in the starter cover andmay pop out and cause injury ifcare is not taken.

48

• Remove remaining rope from rotor thread the new rope -3.5mm x 800mm (0.14" x 31.5") into the rotor and secureit with a simple overhand knot.

• Thread other end - frominside - through the rope guide bushin the starter cover and the underside of the starter grip and securewith special knot (7).

• Coat rope rotor bearing borewith non-resinous oil.

• Slide rotor onto starter post turn it back and forth untilanchor loop (8) of rewind springengages.

• Fit screw and washer and tightendown firmly.Go to "Tensioning rewind spring".

a=2mm(O,08in)

Replacing a broken rewind spring

• Lubricate the new spring with a fewdrops of non-resinous oil -do not open the wire retainer!

• Remove the rope rotor - asdescribed in "Replacing a brokenstarter rope".

• Rei'tlove parts of old spring.• Fit the new spring -

position outer spring loop in therecess - the wire retainer slips off inthis process.

49

o o

If the spring has popped out anduncoiled:• Wind up the spring clockwise, from

the inside outwards, until its overalldiameter is 50mm (2").

• Use pointed nose pliers to gripspring about 10mm (318") from theouter loop and refit it.

• Install the rope rotor.

50

Tensioning the rewind spring

• Make a loop in the starter rope anduse it to turn the rope rotor sevenfull revolutions counterclockwise.

• Hold the rotor steady - straightenthe twisted rope - release the rotor.

• Let go of rope slowly so that itwinds onto the rotor.

The starter grip must be firmly seated inthe rope guide bush.If grip droops to one side:• Add one more turn on rope rotor

to increase spring tension.

When starter rope is fully extended itmust be possible to rotate the rotor

'- another half turn.• If this is not the case, the spring

is overtensioned and could break.• Take one turn of rope off the rotor.

• Refit and secure the starter coverand machine support.

Spark Arresting Screen in Muffler Storing the Machine

1/4 \4

1(. I •0

l.1 •4 4

II \

~(0 I 0

I 5 ]lo I 0

If the engine is low on power, check thespark arresting screen inside the muffler.

• Pull off the spark plugterminal (1).

• Take out shroud mountingscrews (2).

• Remove the shroud (3).

• Take out the screws (4).• Remove the cover (5).• Remove the spark arresting

screen (6).• Clean spark arresting screen if

necessary.• If screen is damaged or coked up,

fit a new one.• Refit the spark arresting screen.• Fit the cover.• Fit the shroud.

For periods of about 3 months or longer:

• Drain and clean the fuel tank.• Run engine until carburetor is dry

this helps prevent the carburetordiaphragms sticking together.

• Remove, clean and inspect theClLtting tool.

• . Thoroughly clean the machine pay special attention to the cylinderfins and air filter.

• Store the machine in a dry, high orlocked location - out of the reachof children and other unauthorizedpersons.

51

Maintenance Chart

Please note that the following maintenance intervals apply for normal operatingconditions only. If your daily working time is longer than nonmal or conditions

g.?- a.are difficult (very dusty work area, etc.), shorten the specified intervals accordingly. -c 0"0 "00 E"(ij L:<n;: ","0 <1> ~ Q;

;§o u'" >- '" 'S '"~.~Olc >- £ Ol<1>= :c E (J Ol

~.>< ~<1> :i: C ::I ~a.

Ot: <1> OlQi!9

<1>~ <1>::1 <1> 0 1" "0 <1>",0 ",- '" <1>.0'" Ol ;: Ol~ ;: E .- .- ro <J)

Complete machineVisual inspection (condition, leaks) x x

Clean x

Control handle Check operation x x 34-36 ~~

Air filterClean x x 41-42

Replace x 41-42r--

Check 32Filter in fuel tank

x

Replace x 32

Fuel tank Clean I x 31

Check idle adjustment -Carburetor cutting tool must not turn x x 37-39

Readjust idle x 37-39

Spark plug Readjust electrode gap x 41

Cylinder fins Clean x

Spark arresting screen in mufflerInspect x I 51Clean or replace x x 51

All accessible screws and nuts(not adjusting screws) Retighten x 40

Visual inspection x x 26-30

Cutting toolsReplace x 26-30

Sharpen metal cutting lools x 43-48

Check tightness of cutting tool x 26-30

Check ~ 42Gearbox lubrication

Top up x 42

Drive shaft lubricationCheck 42-43

Replenish x 42-43

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The user of the brushcutter may carryout only the maintenance operationsdescribed in this manual. Other repairwork may be performed only by an authorized STIHL Service Shop.

warranty claims following repairs canbe accepted only if the repair hasbeen performed by an authorizedSTIHL Service Shop using originalSTIHL spare parts.

Original STIHL parts can be identified bythe STIHL part number, the logoSTIHC and the STIHLparts symbol lSI",. The symbol mayappear alone on small parts.

Specifications

Engine

Single cylinder two-stroke engineModel FS 88 FS 108Displacement: 25.4 cm3 34.4cm3

(1.55cu.in)(2.10cu.in)Bore: 34 mm 37 mm

(1.34 in) (1.46 in)Stroke: 28 mm 32 mm

(1.10 in) (1.26 in)Engine power: 0.9 kW 1.1 kW(to ISO 8893) (1.2 bhp) (1.5 bhp)Max. permissible engine speedwith metal cutting tool (rpm):

12,000 12,000Max. output shaft speed (tool moun-ting)(rpm): 8800 9000Idle speed (rpm): 2800 2 800Ignition System

Fuel System

Carburetor:All position diaphragm carburetorwith integral fuel pump

Air filter:Foam and felt elements

Fuel tank capacity:0.69 I (1.45 US pt)

Fuel mix:see chapter "Fuel"

Weight

without cutting tooland deflector:

Type:Electronic (breakerless)magneto ignition

Spark plug(suppressed):

Electrode gap:Spark plug thread:

Bosch WSR 6 ForNGK BPMR 7A;Heat range 2000.5 mm (0.02 in)M 14 x 1.25;9.5 mm long(0.37 in)

FS 88 with bike handle

FS 88 with loop handle

FS 108 with bike handle

FS 1-08 with loop handle

6.5 kg(14.31b)5.9 kg(13.0Ib)7.1 kg(15.6Ib)6.5 kg(14.3Ib)

53

~

Model Tool Sound Sound power Vibration Vibration Ipressure level Lweq acceleration accelerationlevel Lpeq to to toto ISO 10884 1) ISO 7916 ISO 7916ISO 7917 1

) Idle speed Max. RPM(m/s2

) (m/s2)

Handle HandledB (A) dB (A) riQht left right ~

FS 88 2) Mowina head 98 109 2.7 2.4 41 5.7FS 88 2) Metal tool 95 103 2.7 2.4 5.0 6.3FS 88 R 3) Mowina head 98 109 2.5 2.0 6.3 6.3FS 88 R 4) Metal tool 95 103 2.5 2.0 9.4 6.7FS 108 2) Mowina head 99 111 2.4 3.7 2.4 2.8FS 108 2) Metal tool 96 105 2.4 3.7 2.1 2.5FS 108 R 3) Mowina head 99 111 1.8 1.8 4.4 5.4FS 108 R 4) Metal tool 96 105 1.8 2.2 4.4 3.5

1)

2)

3)

4)

54

Weighted equivalent level includes idling and maximum RPM with the sameduration of exposureVersion with bike handleVersion with loop handleVersion with loop handle with standoff lever

Special Accessories

Cutting Tools 12 Circular saw blade 200 Nylon line for mowing heads(scratcher tooth) **

STIHL «Supercut 2-2» 41127134201 " 2.4mm/0.095"(orange) - for 1 to 84002 710 2140 15m/50ft 0000 930 2243

13 Circular saw blade 200 44m/144ft 0000 930 22442 STIHL «Supercut 20-2» (chisel tooth) .. 87m/285ft 0000 930 2245

40027102162 41127134203 261 m/856ft 0000 930 2246434m/1424ft 0000 930 2247

3 Mahkopf STIHL ·«Autocut 24-2»40027102109

"2.7mm/0.105"(red) - for 7 and 84 STIHL «Autocut 25-2»

40027102108 10.7m/35ft 0000 930 221872m/236ft 0000 930 2224

5 STIHL «Autocut 30-2»4002 710 2107

Thermoplastic blades6 STIHL «Polymatic 30-2» for 8

4002 710 2120 Pack of 12 41110071001

7 STIHL «Fixed Line Head»40017132100 Transport guards

for 9 to 11 4119 790 39068 STIHL «Polycut 40-3» for 12 and 13 4119 790 3901

4111 7102100

9 Grass cutting blade 230-4 * Other special accessories4001 7133801 Shoulder strap

Full b~mess10 Grass cut1ing blade 230-8 * Goggres

4001 713 3803

STIHL multipurpose grease11 Brush knife 250-3 * Not approved for FS 88 and (80 g/3 oz tube) 0781 120 1109

41127134100 FS 108 with loop handle without (225 gl8 oz tube) 0781 120 1110standoff lever STIHL gear lubricant

(80 g/3 oz tube) 0781 120 1117Not approved for FS 88 and (225 g/8 oz tube) 0781 1201119FS 108 with loop handle

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& WARNING!The engine exhaust from this productcontains chemicals known to the State

of California to cause cancer. birthdefects or other reproductive harm.

englisch/english U.S.A.

STIHL FS 88, 108 Owners Instruction Manual - stihlusa.com

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Transcript of STIHL FS 88, 108 Owners Instruction Manual - stihlusa.com