STIHL FS 100 RX Manuel utilisateur

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STIHL FS 100 RX

Instruction Manual

Notice d’emploi

G Instruction Manual

1 - 35

F Notice d’emploi

36 - 75

Original Instruction ManualPrinted on chlorine-free paper

Printing inks contain vegetable oils, paper can be recycled.

0458-259-8221-D. VA0.M15.

0000006642_004_GB

FS 100 RX

English

1

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with electronic systems.

Contents

Dear Customer,

Thank you for choosing a quality

engineered STIHL product.

It has been built using modern

production techniques and

comprehensive quality assurance.

Every effort has been made to ensure

your satisfaction and troublefree use of

the product.

Please contact your dealer or our sales

company if you have any queries

concerning this product.

Your

Dr. Nikolas Stihl

Guide to Using this Manual 2

Safety Precautions and Working

Techniques 2

Approved Combinations of Cutting

Attachment, Deflector, Handle and

Harness 15

Mounting the Loop Handle 16

Adjusting the Throttle Cable 16

Fitting the Carrying Ring 16

Mounting the Cutting Attachment 17

Fuel 18

Fueling 19

Fitting the Harness 20

Balancing the Machine 21

Starting / Stopping the Engine 21

Operating Instructions 23

Cleaning the Air Filter 24

Engine Management 24

Adjusting the Carburetor 24

Spark Arresting Screen in Muffler 25

Spark Plug 25

Lubricating the Gearbox 26

Storing the Machine 27

Maintaining the Mowing Head 27

Maintenance and Care 29

Main Parts 31

Specifications 32

Maintenance and Repairs 33

Disposal 33

STIHL Limited Emission Control

Warranty Statement 34

FS 100 RX

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Pictograms

The meanings of the pictograms

attached to the machine are explained in

this manual.

Depending on the model concerned, the

following pictograms may be attached to

your machine.

Symbols in text

WARNING

Warning where there is a risk of an

accident or personal injury or serious

damage to property.

NOTICE

Caution where there is a risk of

damaging the machine or its individual

components.

Engineering improvements

STIHL's philosophy is to continually

improve all of its products. For this

reason we may modify the design,

engineering and appearance of our

products periodically.

Therefore, some changes, modifications

and improvements may not be covered

in this manual.

The terminology utilized in this manual

when referring to the power tool reflects

the type of cutting attachments that may

be mounted on it. The term "trimmer" is

used to designate an FS unit that is

equipped with a nylon line head or a

head with flexible plastic blades (i.e., the

PolyCut head.) FS models with an "R"

on the nameplate 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. To reduce the risk of

Guide to Using this Manual

Fuel tank; fuel mixture of

gasoline and engine oil

Operate decompression

valve

Manual fuel pump

Operate manual fuel

pump

Tube of grease

Intake air: Summer

operation

Intake air: Winter

operation

Handle heating

Safety Precautions and

Working Techniques

Because a trimmer is a

high-speed, fast-cutting

power tool, special safety

precautions must be

observed to reduce the

risk of personal injury.

It is important that you

read, fully understand

and observe the following

safety precautions and

warnings. Read the

instruction manual and

the safety precautions

periodically. Careless or

improper use may cause

serious or fatal injury.

FS 100 RX

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severe or fatal injury from blade contact

and / or loss of control, never attempt to

use a metal blade on this trimmer.

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

by ricochet in the direction of bystanders

or the operator. Striking such objects

could damage the cutting attachment.

Thrown objects, including broken heads

or polymer blades, may result in serious

or fatal injury to the operator or

bystanders.

Use your trimmer equipped 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

To reduce the risk of injury to bystanders

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

trimmers. Different models may have

different parts and controls. See the

appropriate section of your instruction

manual for a description of the controls

and the function of the parts of your

model.

Safe use of a trimmer involves

1. the operator

2. the power tool

3. the use of the power tool

THE OPERATOR

Physical Condition

You must be in good physical condition

and mental health and not under the

influence of any substance (drugs,

alcohol, etc.) which might impair vision,

dexterity or judgment. Do not operate

this machine when you are fatigued.

WARNING

Be alert – if you get tired, take a break.

Tiredness may result in loss of control.

Working with any power tool can be

strenuous. If you have any condition that

might be aggravated by strenuous work,

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

FS 100 RX

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4

exposure to vibration are mentioned as

factors in the development of whitefinger

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.

WARNING

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.

WARNING

Be particularly alert and cautious when

wearing hearing protection because

your ability to hear warnings (shouts,

alarms, etc.) is restricted.

To reduce the risk of

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.

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.

Always wear heavy duty

work gloves (e.g. made of

leather or other wear

resistant material) when

handling the machine

and the cutting tool.

Heavy-duty, nonslip

gloves improve your grip

and help to protect your

hands.

FS 100 RX

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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.

THE POWER TOOL

For illustrations and definitions of the

power tool parts see the chapter on

"Main Parts."

WARNING

Never modify this power tool in any way.

Only attachments supplied by STIHL

and expressly approved by STIHL for

use with the specific STIHL model are

authorized. Although certain

unauthorized attachments are useable

with STIHL power tools, their use may,

in fact, be extremely dangerous. For the

cutting attachments authorized by

STIHL for your unit, see the chapter

"Approved Combinations of Cutting

Attachment, Deflector, Handle and

Harness" in the instruction manual or the

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. Check in particular that

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.

In case of doubt, have it checked by your

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 line contact, never carry or

transport your power tool with the cutting

attachment moving.

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

sure the cutting attachment has stopped

before putting a trimmer down. When

transporting it in a vehicle, properly

secure it to prevent turnover, fuel

spillage and damage to the unit.

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.

Good footing is very

important. Wear sturdy

boots with nonslip soles.

Steel-toed safety boots

are recommended.

The gearbox becomes

hot during operation. To

reduce the risk of burn

injury, do not touch the

gear housing when it is

hot.

389BA019 KN

FS 100 RX

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Fuel

Your STIHL power tool uses an oil-

gasoline mixture for fuel (see the

chapter on "Fuel" of your instruction

manual.)

WARNING

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

cap on your power tool carefully so as to

allow any pressure build-up in the tank

to release slowly. Never remove the fuel

filler cap while the engine is running.

Select bare ground for fueling and move

at least 10 feet (3 m) from the fueling

spot before starting the engine. Wipe off

any spilled fuel before starting your

machine.

WARNING

In order to reduce the risk of fuel spillage

and fire from an improperly tightened

fuel cap, correctly position and tighten

the fuel cap in the fuel tank opening.

Different models may be equipped with

different fuel caps.

Toolless cap with grip

To do this with this STIHL cap, raise the

grip on the top of the cap until it is upright

at a 90° angle. Insert the cap in the fuel

tank opening with the raised positioning

marks on the grip of the cap and on the

fuel tank opening lining up. Using the

grip, press the cap down firmly while

turning it clockwise as far as it will go

(approx. 1/4 turn).

Misaligned, damaged or broken cap

N If the cap does not drop fully into the

opening when the positioning marks

line up and/or if the cap does not

tighten properly when twisted, the

base of the cap may be prematurely

rotated (vis-à-vis the top) to the

closed position. Such misalignment

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 combus-

tible fuel vapor may

escape from the fuel

system.

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.

Fold the grip flush with

the top of the cap. Grip

the cap and check for

tightness. If the grip does

not lie completely flush

with the cap and the

detent on the grip does

not fit in the correspond-

ing recess in the filler

opening, or if the cap is

loose in the filler opening,

the cap is not properly

seated and tightened and

you must repeat the

above steps.

001BA220 KN

FS 100 RX

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7

can result from handling, cleaning

or an improper attempt at

tightening.

N To return the cap to the open

position for installation, turn the cap

(with the grip up) until it drops fully

into the tank opening. Next, twist the

cap counterclockwise as far as it will

go (approx. 1/4 turn) – this will twist

the base of the cap into the correct

position. Then, twist the cap

clockwise, closing it normally.

N If your cap still does not tighten

properly, it may be damaged or

broken; immediately stop use of the

unit and take it to your authorized

STIHL dealer for repair.

Screw Cap

WARNING

See also the "Fueling" chapter in your

Instruction Manual for additional

information.

Before Starting

WARNING

Always check your power tool for proper

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. Never use a power tool

that is damaged or not properly

maintained.

WARNING

Check fuel system for leaks, especially

the visible parts, e.g., filler cap, hose

connections, manual fuel pump (only for

power tools equipped with a manual fuel

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

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

The cutting attachment must be properly

tightened and in safe operating

condition. Inspect for loose parts (nuts,

screws, etc.) Replace damaged heads

before using the power tool.

Keep the handles clean and dry at all

times; it is particularly important to keep

them free of moisture, pitch, oil, fuel mix,

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.

Left: Base of cap in closed posi-

tion (with open space)

Right: Base of cap correctly posi-

tioned for installation

001BA227 KN

001BA226 KN

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.

FS 100 RX

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WARNING

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.)

Arrows on the deflector (as seen from

the underside)show the correct direction

of rotation of the cutting attachment.

When viewed from above, however, the

cutting attachment rotates

counterclockwise.

Adjust the hand grip and harness (if you

are wearing one) to suit your size before

starting work. The machine should be

properly balanced as specified in your

instruction manual for proper control and

less fatigue in operation. To be better

prepared in case of an emergency,

practise releasing the unit from the

harness as quickly as possible.

Starting

Start the engine at least 10 feet (3 m)

from the fueling spot, outdoors only.

For specific starting instructions, see the

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

To reduce the risk of injury from blade or

line contact, be absolutely sure that the

cutting attachment is clear of you and all

other obstructions and objects, 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,

which should release the starting throttle

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 if you are using one (see

appropriate chapter of the instruction

manual.)

WARNING

Your power tool is a one-person

machine. Do not allow other persons in

the general work area, even when

starting.

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.

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".)

FS 100 RX

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If you cannot set the correct idle speed,

have your STIHL dealer check your

power tool and make proper

adjustments and repairs.

During Operation

Holding and Controlling the Power Tool

Always hold the unit firmly with both

hands on the handles while you are

working. Wrap your fingers and thumbs

around the handles, keeping the

handles cradled between your thumb

and forefinger. Keep your hands in this

position to have your power tool under

control at all times. Make sure your

trimmer handles and grips are in good

condition and free of moisture, pitch, oil,

fuel mix or grease.

WARNING

To reduce the risk of injury from loss of

control, never work on a ladder or on any

other insecure support. Never hold the

cutting attachment above waist height.

WARNING

Do not overreach. Keep proper footing

and balance at all times. Special care

must be taken in slippery conditions (wet

ground, snow) and in difficult, overgrown

terrain. Watch for hidden obstacles such

as tree stumps, roots and ditches to

avoid stumbling. For better footing, 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

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

dust and other airborne contaminants, in

particular those with a smaller particle

size, may cause respiratory or other

illnesses. Control dust at the source

002BA054 KN

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.

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.

FS 100 RX

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10

where possible. Use good work

practices, such as operating the unit so

that the wind or operating process

directs any dust raised by the power tool

away from the operator. Follow the

recommendations of EPA / OSHA /

NIOSH and occupational and trade

associations with respect to dust

("particulate matter".) When the

inhalation of dust cannot be

substantially controlled, i.e., kept at or

near the ambient (background) level, the

operator and any bystanders should

wear a respirator approved by NIOSH /

MSHA for the type of dust encountered.

Operating Instructions

WARNING

Do not operate your power tool using the

starting throttle lock, as you do not have

control of the engine speed.

In the event of an emergency, shut off

the engine immediately – move the slide

control / stop switch to 0 or STOP.

WARNING

The rotating cutting attachment may

fling foreign objects directly or by

ricochet a great distance.

To reduce the risk of eye and other injury

always wear proper eye protection (see

the chapter on "Proper Clothing") and

ensure that bystanders are at least

50 feet (15 m) away. To reduce the risk

of damage to property, also maintain this

distance from such objects as vehicles

or windows. Even maintaining a

minimum distance of 15 meters cannot

exclude the potential danger. 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

This trimmer is normally to be used at

ground level with the cutting attachment

parallel to the ground. Use of a trimmer

above ground level or with the cutting

attachment perpendicular to the ground

may increase the risk of injury, since the

cutting attachment is more fully exposed

and the power tool may be more difficult

to control.

WARNING

During cutting, check the tightness and

the condition of the cutting attachment at

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 head for cracks, wear

and damage.

WARNING

A loose head may vibrate, crack, break

or come off the trimmer, 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. loosens after

being properly tightened, stop work

immediately. The retaining nut may be

worn or damaged and should be

replaced. If the head continues to

loosen, see your STIHL dealer. Never

use a trimmer with a loose cutting

attachment.

WARNING

Replace a cracked, damaged or worn-

out head or a cracked, bent, warped,

damaged, dull or worn out blade

immediately, even if damage is limited to

superficial cracks. Such attachments

may shatter at high speed and cause

serious or fatal injury.

15m (50ft)

Never use metal

blades on this trim-

mer. Only mowing

heads are

authorized.

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 and property

(e.g. parked vehicles,

windows).

FS 100 RX

English

11

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

the engine before adjusting the length of

the nylon line on manually adjustable

mowing heads.

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

The muffler and other parts of the engine

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

become hot during operation and remain

hot for a while after stopping the engine.

To reduce risk of burns, do not touch the

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.

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. If your gas/oil mix ratio is correct

(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

experience loss of performance and you

suspect a clogged screen, have your

muffler maintained by a STIHL servicing

dealer. Some state or federal laws or

regulations may require a properly

maintained spark arrestor for certain

uses. See the "Maintenance, Repair and

Storing" section of these Safety

Precautions. Remember that the risk of

a brush or forest fire is greater in hot or

dry conditions.

WARNING

Using the Cutting Attachments

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.

The gearbox becomes

hot during operation. To

reduce the risk of burn

injury, do not touch the

gear housing when it is

hot.

Some STIHL power tools

are equipped with a cata-

lytic converter, which is

designed to reduce the

exhaust emissions of the

engine by a chemical pro-

cess in the muffler. Due

to this process, the muf-

fler does not cool down

as rapidly as conven-

tional mufflers when the

engine returns to idle or

is shut off. To reduce the

risk of fire and burn inju-

ries when using a

catalytic converter,

always set your power

tool down in the upright

position and never locate

it where the muffler is

near dry brush, grass,

wood chips or other com-

bustible materials while it

is still hot.

FS 100 RX

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12

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 this trimmer.

Using the Mowing Heads

Do not use with mowing line longer than

the intended length. With a properly

mounted deflector, the built-in line-

limiting 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

engine and reduces its operating speed.

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.

Mowing heads are to be used only on

trimmers 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

are no plants along the edge of the lawn.

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 cord 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).

STIHL PolyCut mowing head 20-3

Uses either nylon lines or nonrigid,

pivoting polymer blades.

WARNING

Three rectangular wear limit marks are

applied to the base (periphery) of the

PolyCut. To reduce the risk of serious

injury 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.

000BA019 KN

002BA177 KN

FS 100 RX

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13

WARNING

If the wear limit marks are ignored, there

is a risk of the cutting attachment

shattering and flying parts injuring the

operator or bystanders. 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

may otherwise shatter and flying objects

could result in injury to the operator or

bystanders. Install a new mowing head.

MAINTENANCE, REPAIR AND

STORING

Maintenance, replacement, or repair of

the emission control devices and

systems may be performed by any

nonroad engine repair establishment or

individual. However, if you make a

warranty claim for a component which

has not been serviced or maintained

properly or if nonapproved replacement

parts were used, STIHL may deny

coverage.

WARNING

Use only identical STIHL replacement

parts for maintenance and repair. Use of

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

not described in your instruction manual.

Have such work performed by your

STIHL servicing dealer only.

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 system with the

spark plug boot removed from the spark

plug or with a removed spark plug, since

uncontained sparking may cause a fire.

WARNING

Do not operate your power tool if the

muffler is damaged, missing or modified.

An improperly maintained muffler will

increase the risk of fire and hearing loss.

Your muffler is equipped with a spark-

arresting 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

governmental entities/agencies, such as

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.

WARNING

Never repair damaged or broken heads.

This may cause parts of the cutting

attachment to come off and result in

serious or fatal injuries.

FS 100 RX

English

14

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 100 RX

English

15

Permissible combinations

The complete equipment comprises:

– Cutting attachment

– Guard

– Handle

– Harness (special accessory)

Choose the proper combination from the

table depending on the cutting

attachment!

WARNING

For safety reasons, other combinations

are not permissible – risk of accident!

Cutting attachments

Mowing heads

1 STIHL SuperCut 20-2

2 STIHL AutoCut C 25-2

3 STIHL AutoCut 25-2

4 STIHL AutoCut 36-2

5 STIHL TrimCut 31-2

6 STIHL DuroCut 20-2

7 STIHL PolyCut 20-3

Guard

8 Deflector for mowing heads

Handle

9 Loop handle

Harnesses

10 Shoulder strap can be used

11 Full harness can be used

Approved Combinations of Cutting Attachment, Deflector, Handle and Harness

Cutting attachment Guard Handle Harness

1

2

3

4

5

7

8

10

11

9

0000-GXX-0395-A0

6

FS 100 RX

English

16

N Fit the loop handle (1) at a

distance (A) of approx. 20 cm

forward of the control handle (2)

N Orient the loop handle

N Tighten down the bolts

The sleeve (3) must be located between

the loop handle and the control handle.

A properly adjusted throttle cable is the

precondition for correct operation in the

starting throttle, idle and full throttle

positions.

Adjust the throttle cable only when the

machine is completely and properly

assembled.

N Use a suitable tool to push the slide

to the end of the slot (see

illustration).

N Press down the trigger lockout (1)

and squeeze the throttle trigger (2)

(full throttle position) – this sets the

throttle cable correctly.

The carrying ring comes standard with

the machine or is available as a special

accessory.

For position of carrying ring see "Main

Parts".

N Place the clamp (1) against the

drive tube with the tapped hole on

the left (viewed from engine).

N Squeeze the two ends of the clamp

together and hold in that position.

N Insert the M6x14 screw (2).

N Line up the carrying ring.

N Tighten down the screw firmly.

Mounting the Loop Handle Adjusting the Throttle Cable

002BA163 KN

2

1

002BA161 KN

Fitting the Carrying Ring

002BA142 KN

1

2

1

FS 100 RX

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17

Laying down the machine

N Switch off the engine

N Lay down the machine so that the

mount for the cutting attachment

faces upward

Blocking the shaft

To mount and remove the cutting

attachments, the shaft (1) must be

blocked with the locking pin (2) or Allen

wrench (2). The parts are included in the

scope of delivery and are available as

special accessories.

N Push the locking pin (2) or Allen

wrench (2) as far as it will go into the

hole (3) in the gear – press gently

N Turn the shaft, nut or cutting

attachment until the locking pin

engages and the shaft is blocked

Mounting the STIHL PolyCut 20-3

Keep the supplement sheet for the

mowing head in a safe place.

WARNING

Only mount the mowing head with

doubled stepped support as shown

above.

Mounting the mowing head with a

threaded connection

Keep the supplement sheet for the

mowing head in a safe place.

N Turn the mowing head

counterclockwise as far as possible

onto the shaft (1)

N Block the shaft

N Tighten the mowing head

NOTICE

Remove the tool again used to block the

shaft.

Removing the mowing head.

N Block the shaft

N Rotate the mowing head clockwise

Mounting the Cutting

Attachment

002BA342 KN

2

3

1

002BA569 KN

2

259BA012 KN

1

002BA385 KN

FS 100 RX

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18

This engine is certified to operate on

unleaded gasoline and the STIHL two-

stroke engine oil at a mix ratio of 50:1.

Your engine requires a mixture of high-

quality gasoline and two-stroke air

cooled engine oil.

Use mid-grade unleaded gasoline with a

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.), but magnesium castings and

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.

For further details, see

www.STIHLusa.com/ethanol

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.

If your power tool shows an incorrect idle

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 STIHL HP Ultra oil or ask your

dealer for an equivalent high quality oil

to ensure the maximum performance of

the product for the full lifetime.

To meet the requirements of EPA

40CFR90/1054 we recommend to use

STIHL HP Ultra oil.

Do not use BIA or TCW rated (two-

stroke water cooled) mix oils or other

mix oils that state they are for use in both

water cooled and air cooled engines

(e.g., outboard motors, snowmobiles,

chain saws, mopeds, etc.).

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

container on the ground before filling. To

reduce the risk of sparks from static

discharge and resulting fire and/or

explosion, do not fill fuel containers that

are sitting in or on a vehicle or trailer.

The container should be kept tightly

closed in order to limit the amount of

moisture that gets into the mixture.

The machine’s fuel tank should be

cleaned as necessary.

STIHL MotoMix

STIHL recommends the use of STIHL

MotoMix. STIHL MotoMix has a high

octane rating and ensures that you

always use the right mix ratio.

STIHL MotoMix uses STIHL HP Ultra

two-stroke engine oil suited for high

performance engines.

For further details, see

www.STIHLusa.com/ethanol

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.

Fuel

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STIHL FS 100 RX Manuel utilisateur

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