STIHL FS 55 Manuel utilisateur

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STIHL FS 55

Instruction Manual

Notice d’emploi

G Instruction Manual

1 - 38

F Notice d’emploi

39 - 79

Original Instruction ManualPrinted on chlorine-free paper

Printing inks contain vegetable oils, paper can be recycled.

0458-233-8221-C. M7.C11.CP.

0000002417_006_GB

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

1

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Contents

Dear Customer,

Thank you for choosing a quality

engineered STIHL product.

This machine has been built using

modern production techniques and

comprehensive quality assurance.

Every effort has been made to ensure

your satisfaction and troublefree use

of the machine.

Please contact your dealer or our

sales company if you have any

queries concerning your machine.

Your

Hans Peter Stihl

Guide to Using this Manual 2

Safety Precautions and Working

Techniques 2

Approved Combinations of Cutting

Attachment, Deflector, Handle and

Harness 11

Mounting the Bike Handle 12

Mounting the Loop Handle 13

Fitting the Carrying Ring 15

Mounting the Deflector 15

Mounting the Cutting Attachment 16

Fuel 18

Fueling 19

Fitting the Harness 20

Balancing the Trimmer/Brushcutter 20

Starting / Stopping the Engine 21

Operating Instructions 25

Cleaning the Air Filter 25

Engine Management 26

Adjusting the Carburetor 26

Spark Plug 28

Engine Running Behavior 29

Rewind Starter 29

Storing the Machine 29

Sharpening Metal Cutting Blades 30

Inspections and Maintenance by

Dealer 30

Maintenance and Care 31

Main Parts 33

Specifications 35

Special Accessories 36

Maintenance and Repairs 36

STIHL Limited Emission Control

Warranty Statement 37

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

2

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

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.

Observe all applicable local safety

regulations, standards and ordinances.

If you have not used this type of power

tool before: Have your dealer or other

experienced user show you how to

operate your power tool or attend a

special course in its operation.

Minors should never be allowed to use a

power tool.

Keep bystanders, especially children,

and animals away from the work area.

When the power tool is not in use, shut it

off so that it does not endanger others.

Secure it against unauthorized use.

The user is responsible for avoiding

injury to third parties or damage to their

property.

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

Warning where there is a risk of

an accident or personal injury or

serious damage to property.

Caution where there is a risk of

damaging the machine or its

individual components.

Safety Precautions and

Working Techniques

Some special safety pre-

cautions must be

observed to reduce the

risk of personal injury

when operating this

power tool because of the

very high speed of its cut-

ting attachment.

It is important you read

and understand the

instruction manual before

using your power tool for

the first time and keep

the manual in a safe

place for future refer-

ence. Non-observance of

the safety precautions

may result in serious or

even fatal injury.

FS 55, FS 55 C, FS 55 R, FS 55 RC

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3

Do not lend or rent your power tool

without the instruction manual. Be sure

that anyone using it understands the

information contained in this manual.

The use of noise emitting power tools

may be restricted to certain times by

national or local regulations.

To operate the power tool you must be

rested, in good physical condition and

mental health.

If you have any condition that might be

aggravated by strenuous work, check

with your doctor before operating a

power tool.

Persons with pacemakers only: The

ignition system of your power tool

produces an electromagnetic field of a

very low intensity. This field may

interfere with some pacemakers. To

reduce health risks, STIHL recommends

that persons with pacemakers consult

their physician and the pacemaker

manufacturer before operating this tool.

Do not operate the power tool if you are

under the influence of any substance

(drugs, alcohol) which might impair

vision, dexterity or judgment.

Depending on the cutting attachment

fitted, use your power tool only for

cutting grass, wild growth, shrubs,

scrub, bushes, small diameter trees and

similar materials.

Do not use your power tool for any other

purpose since this may result in

accidents.

Only use cutting attachments and

accessories that are explicity approved

for this power tool model by STIHL or

are technically identical. If you have any

questions in this respect, consult a

servicing dealer. Use only high quality

parts and accessories in order to avoid

the risk of accidents and damage to the

machine.

STIHL recommends the use of original

STIHL replacement parts. They are

specifically designed to match your

model and meet your performance

requirements.

Never attempt to modify your power tool

in any way since this may increase the

risk of personal injury. STIHL excludes

all liability for personal injury and

damage to property caused while using

unauthorized attachments.

Do not use a pressure washer to clean

the unit. The solid jet of water may

damage parts of the unit.

The deflector on this power tool cannot

protect the operator from all objects

thrown by the cutting attachment

(stones, glass, wire, etc.). Such objects

may ricochet and then hit the operator.

Clothing and Equipment

Wear proper protective clothing and

equipment.

Avoid clothing that could get caught on

branches or brush or moving parts of the

machine. Do not wear a scarf, necktie or

jewelry. Tie up and confine long hair

(e.g. with a hair net, cap, hard hat, etc.).

Sturdy shoes with non-slip soles may be

worn as an alternative only when using

mowing heads.

A face shield alone does not provide

adequate eye protection.

Wear hearing protection, e.g. earplugs

or ear muffs.

STIHL offers a comprehensive range of

personal protective clothing and

equipment.

Clothing must be sturdy

but allow complete free-

dom of movement. Wear

snug-fitting clothing, an

overall and jacket combi-

nation, do not wear a

work coat.

Wear steel-toed safety

boots with non-slip soles.

Wear a safety hard hat

for thinning operations,

when working in high

scrub and where there is

a danger of head injuries

from falling objects. To

reduce the risk of injury

from thrown objects,

always wear a face shield

and safety glasses.

Wear heavy-duty gloves.

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4

Transporting the Power Tool

Always turn off the engine.

Carry the unit hanging from the shoulder

strap or properly balanced by the drive

tube. Fit transport guard on metal cutting

attachments to avoid the risk of injury

from blade contact

Transporting in a vehicle: Properly

secure your power tool to prevent

turnover, fuel spillage and damage.

Fueling

Always shut off the engine before

refueling.

Do not fuel a hot engine – fuel may spill

and cause a fire.

Open the fuel cap carefully to allow any

pressure build-up in the tank to release

slowly and avoid fuel spillage.

Fuel your power tool only in well-

ventilated areas. If you spill fuel, wipe

the machine immediately – if fuel gets on

your clothing, change immediately.

Your power tool comes standard with

either a screw-type or bayonet-type fuel

cap.

This reduces the risk of unit vibrations

causing the fuel cap to loosen or come

off and spill quantities of fuel.

To reduce the risk of serious or fatal

burn injuries, check for fuel leakage. If

fuel leakage is found, do not start or run

the engine until leak is fixed.

Before starting

Check that your power tool is properly

assembled and in good condition – refer

to appropriate chapters in the instruction

manual.

– Use only an approved combination

of cutting attachment, deflector,

handle and harness. All parts must

be assembled properly and

securely.

– Slide control / stop switch must

move easily to STOP or 0

– Smooth action of throttle trigger

interlock (if fitted) and throttle trigger

– the throttle trigger must return

automatically to the idle position.

– Check that the spark plug boot is

secure – a loose boot may cause

arcing that could ignite combustible

fumes and cause a fire.

– Cutting tool or attachment: Check

for correct and secure assembly

and good condition.

– Check protective devices (e.g.

deflector for cutting tool, rider plate)

for damage or wear. Always replace

damaged parts. Do not operate your

machine with a damaged deflector

or worn rider plate (lettering and

arrows no longer legible).

– Never attempt to modify the controls

or the safety devices in any way.

– Keep the handles dry and clean –

free from oil and dirt – for safe

control of the power tool.

– Adjust the harness and handle(s) to

suit your height and reach. See

chapters on "Fitting the Harness"

and "Balancing the

Trimmer/Brushcutter".

To reduce the risk of personal injury,

do not operate your power tool if it is

damaged or not properly assembled.

Gasoline is an

extremely flammable

fuel. Keep clear of naked

flames. Do not spill any

fuel – do not smoke.

002BA079 KN

After fueling, tighten

down the screw-type fuel

cap as securely as

possible.

Insert the fuel cap with

hinged grip (bayonet-type

cap) correctly in the

opening, turn it clockwise

as far as stop and fold the

grip down.

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5

If you use a shoulder strap or full

harness: Practise removing and putting

down the machine as you would in an

emergency. To avoid damage, do not

throw the machine to the ground when

practising.

Starting the engine

Start the engine at least 3 meters from

the fueling spot, outdoors only.

Place the unit on firm ground in an open

area. Make sure you have good balance

and secure footing. Hold the unit

securely. The cutting attachment must

be clear of the ground and all other

obstructions because it may begin to run

when the engine starts.

Your power tool is a one-person unit. To

reduce the risk of injury from thrown

objects, do not allow other persons

within a radius of 15 meters of your own

position – even when starting.

Check idle speed setting: The cutting

attachment must not rotate when the

engine is idling with the throttle trigger

released.

To reduce the risk of fire, keep hot

exhaust gases and hot muffler away

from easily combustible materials (e.g.

wood chips, bark, dry grass, fuel).

Holding and Controlling the Power

Tool

Always hold the unit firmly with both

hands on the handles.

Make sure you always have good

balance and secure footing.

Models with bike handle

Right handle on control handle, left hand

on left handle.

Models with loop handle

On units with a loop handle and barrier

bar, left hand on loop handle, right hand

on control handle, even if you are left-

handed.

During Operation

Make sure you always have good

balance and secure footing.

In the event of impending danger or in

an emergency, switch off the engine

immediately by moving the slide control

/ stop switch to STOP or 0.

To reduce the risk of personal injury ,

do not allow any other persons within a

radius of 15 meters of your own position.

To reduce the risk of damage to

property, also maintain this distance

from other objects (vehicles, windows).

The correct engine idle speed is

important to ensure that the cutting

attachment stops rotating when you let

go of the throttle trigger.

To reduce the risk of

injury, avoid contact with

the cutting attachment.

Do not drop start the

power tool – start the

engine as described in

the instruction manual.

Note that the cutting

attachment continues to

run for a short period

after you let go of the

throttle trigger – fly-

wheel effect.

002BA055 KN

002BA080 KN

15m (50ft)

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6

Check and correct the idle speed setting

at regular intervals. If the cutting

attachment still rotates at idle speed,

have your dealer make proper

adjustments or repairs. STIHL

recommends a STIHL servicing dealer.

Take special care in slippery conditions

– damp, snow, ice, on slopes or uneven

ground.

Watch out for obstacles: Roots, tree

stumps or holes which could cause you

to trip or stumble.

Always stand on the ground while

working, never on a ladder, work

platform or any other insecure support.

Be particularly alert and cautious when

wearing hearing protection because

your ability to hear warnings (shouts,

alarms, etc.) is restricted.

To reduce the risk of accidents, take a

break in good time to avoid tiredness or

exhaustion.

Work calmly and carefully – in daylight

conditions and only when visibility is

good. Stay alert so as not to endanger

others.

To reduce the risk of serious or fatal

injury from breathing toxic fumes,

ensure proper ventilation when working

in trenches, hollows or other confined

locations.

To reduce the risk of accidents, stop

work immediately in the event of

nausea, headache, visual disturbances

(e.g. reduced field of vision), problems

with hearing, dizziness, deterioration in

ability to concentrate. Apart from other

possibilities, these symptoms may be

caused by an excessively high

concentration of exhaust gases in the

work area.

Operate your power tool so that it

produces a minimum of noise and

emissions – do not run the engine

unnecessarily, accelerate the engine

only for cutting.

To reduce the risk of fire, do not

smoke while operating or standing near

your power tool. Note that combustible

fuel vapor may escape from the fuel

system.

The dusts, vapor and smoke produced

during operation may be dangerous to

health. If the work area is very dusty or

smoky, wear a respirator.

If your power tool is subjected to

unusually high loads for which it was not

designed (e.g. heavy impact or a fall),

always check that it is in good condition

before continuing work – see also

"Before Starting".

Check the fuel system in particular for

leaks and make sure the safety devices

are working properly. Do not continue

operating your power tool if it is

damaged. In case of doubt, have the

machine checked by your servicing

dealer.

Do not operate your power tool with the

starting throttle lock engaged – engine

speed cannot be controlled in this

position.

Special care must be taken when

working in difficult, over-grown terrain.

When cutting high scrub, under bushes

and hedges: Keep cutting tool at

minimum height of 15 cm to avoid

harming small animals.

Always shut off the engine before

leaving the unit unattended.

Check the cutting attachment at regular

short intervals during operation or

immediately if there is a noticeable

change in cutting behavior:

Your power tool produces

toxic exhaust fumes as

soon as the engine is

running. These fumes

may be colorless and

odorless and contain

unburned hydrocarbons

and benzol. Never run

the engine indoors or in

poorly ventilated loca-

tions, even if your model

is equipped with a cata-

lytic converter.

To reduce the risk

of injury from

thrown objects,

never operate the

unit without the

proper deflector for

the type of cutting

attachment being

used.

Inspect the work area:

Stones, pieces of metal

or other solid objects can

be thrown and cause per-

sonal injury or damage

the cutting attachment

and property (e.g. parked

vehicles, windows).

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

7

– Turn off the engine. Hold the unit

firmly and wait for the cutting

attachment to come to a standstill.

– Check condition and tightness, look

for cracks.

– Check sharpness.

– Replace damaged or dull cutting

attachments immediately, even if

they have only superficial cracks.

Clean grass and plant residue off the

cutting attachment mounting at regular

intervals – remove any build up of

material from the cutting attachment and

deflector.

To reduce the risk of injury, shut off

the engine before replacing the cutting

attachment.

Do not continue using or attempt to

repair damaged or cracked cutting

attachments by welding, straightening or

modifying the shape (out of balance).

This may cause parts of the cutting

attachment to come off and hit the

operator or bystanders at high speed

and result in serious or fatal injuries.

When using mowing heads

Equip the deflector with the additional

components specified in the instruction

manual.

Use only the deflector with properly

mounted line limiting blade to ensure the

mowing lines are automatically trimmed

to the approved length.

To reduce the risk of injury, always

turn off the engine before adjusting the

nylon line of manually adjustable

mowing heads

Using the unit with over-long nylon

cutting lines reduces the motor's

operating speed. The clutch then slips

continuously and this causes

overheating and damage to important

components (e.g. clutch, polymer

housing components) – and this can

increase the risk of injury from the

cutting attachment rotating while the

engine is idling.

When using metal cutting tools

STIHL recommends the use of original

STIHL metal cutting attachments. They

are specifically designed to match your

model and meet your performance

requirements.

Metal cutting attachments rotate at very

high speed. The forces that occur act on

the machine, the attachment and the

material being cut.

Sharpen metal cutting attachments

regularly as specified.

Unevenly sharpened metal cutting

attachments cause out-of-balance

which can impose extremely high loads

on the machine and increase the risk of

breakage.

Dull or improperly sharpened cutting

edges can put a higher load on the

cutting attachment and increase the risk

of injury from cracked or broken parts.

Inspect metal cutting attachments for

cracks or warping after every contact

with hard objects (e.g. stones, rocks,

pieces of metal). To reduce the risk of

injury, remove burrs and other visible

build-ups of material (use a file) because

they may become detached and be

thrown at high speed during operation.

To reduce the above-mentioned risks

when using a metal cutting attachment,

never use a metal cutting attachment

with a diameter larger than specified. It

must not be too heavy. It must be

manufactured from materials of

adequate quality and its geometry must

be correct (shape, thickness).

To reduce the risk of injury, a metal

cutting attachment not manufactured by

STIHL must not be heavier, thicker,

have a different shape or a diameter

larger than the largest metal cutting

attachment approved by STIHL for this

power tool model.

Vibrations

Prolonged use of the power tool may

result in vibration-induced circulation

problems in the hands (whitefinger

disease).

No general recommendation can be

given for the length of usage because it

depends on several factors.

The period of usage is prolonged by:

– Hand protection (wearing warm

gloves)

– Work breaks

The period of usage is shortened by:

– Any personal tendency to suffer

from poor circulation (symptoms:

frequently cold fingers, tingling

sensations).

– Low outside temperatures.

– The force with which the handles

are held (a tight grip restricts

circulation).

FS 55, FS 55 C, FS 55 R, FS 55 RC

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8

Continual and regular users should

monitor closely the condition of their

hands and fingers. If any of the above

symptoms appear (e.g. tingling

sensation in fingers), seek medical

advice.

Maintenance and Repairs

Service the machine regularly. Do not

attempt any maintenance or repair work

not described in the instruction manual.

Have all other work performed by a

servicing dealer.

STIHL recommends that you have

servicing and repair work carried out

exclusively by an authorized STIHL

servicing dealer. STIHL dealers are

regularly given the opportunity to attend

training courses and are supplied with

the necessary technical information.

Only use high-quality replacement parts

in order to avoid the risk of accidents

and damage to the machine. If you have

any questions in this respect, consult a

servicing dealer.

STIHL recommends the use of original

STIHL replacement parts. They are

specifically designed to match your

model and meet your performance

requirements.

To reduce the risk of injury,always shut

off the enginebefore carrying out any

maintenance or repairs or cleaning the

machine. – Exception: Carburetor and

idle speed adjustments.

Do not turn the engine over on the

starter with the spark plug boot or spark

plug removed unless the slide control /

stop switch is on STOP or 0 since there

is otherwise a risk of fire from

uncontained sparking.

To reduce the risk of fire, do not service

or store your machine near open flames.

Check the fuel filler cap for leaks at

regular intervals.

Use only a spark plug of the type

approved by STIHL and make sure it is

in good condition – see "Specifications".

Inspect the ignition lead (insulation in

good condition, secure connection).

Check the condition of the muffler.

To reduce the risk of fire and damage

to hearing, do not operate your

machine if the muffler is damaged or

missing. –

Do not touch a hot muffler since burn

injury will result.

Maintenance, replacement, or repair

of the emission control devices and

systems may be performed by any

nonroad engine repair establishment

or individual. However, if you make a

warranty claim for a component

which has not been serviced or

maintained properly or if

nonapproved replacement parts were

used, STIHL may deny coverage.

For any maintenance please refer to the

maintenance chart and to the warranty

statement near the end of the instruction

manual.

Symbols on Deflectors

An arrow on the deflector shows the

correct direction of rotation of the cutting

attachments.

Shoulder strap

N Use a shoulder strap.

N With the engine running, attach the

machine to the shoulder strap.

Grass cutting blades must always be

used in combination with a shoulder

strap.

Use deflector in

combination with

mowing heads

only. Do not use

metal cutting

attachments.

FS 55, FS 55 C, FS 55 R, FS 55 RC

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9

Mowing Head with Nylon Lines

Nylon line achieves a soft cut for edging

and trimming around trees, fence posts,

etc. – less risk of damaging tree bark.

STIHL FixCut

Check the wear limit marks!

N If the raised moldings (1) on the

base of the attachment are worn as

shown in the illustration (above

right), do not continue using the

mowing head. Install a new one.

There is otherwise a risk of injury

from thrown parts of the head.

STIHL Polycut Mowing Head with

Polymer Blades

For mowing unobstructed edges of

meadows (without posts, fences, trees

or similar obstacles).

Check the wear limit marks!

If one of the wear limit marks on the

PolyCut mowing head is worn through

(arrow): Do not continue using the

mowing head. Install a new one. There

is otherwise a risk of injury from thrown

parts of the head.

It is important to follow the maintenance

instructions for the Polycut mowing

head.

Risk of Kickout (Blade Thrust) with

Metal Cutting Blades

When using grass cutting blades there is

a risk of kickout when the rotating blade

comes into contact with a solid object

like a tree trunk, branch, tree stump,

rock or similar. The machine is thrown to

the right or to the rear – opposite to the

blade's direction of rotation.

The risk of kickout is greatest when the

black area of the rotating blade comes

into contact with a solid object.

To reduce the risk of injury,

never use steel wire in place of

the nylon cutting line.

000BA015 KN

002BA177 KN

002BA135 KN

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10

Grass Cutting Blade

Use for grass and weeds only – sweep

the brushcutter in an arc like a scythe.

Resharpen the grass cutting blade

according to instructions when it has

dulled noticeably.

Improper use may damage the

grass cutting blade – risk of

injury from thrown parts.

000BA020 KN

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11

Approved Combinations

Select correct combination from the

table according to the cutting

attachment you intend to use.

Cutting Attachments

Mowing heads

1 STIHL SuperCut 20-2

2 STIHL AutoCut C 25--2

3 STIHL AutoCut 25-2

4 STIHL TrimCut 31-2

5 STIHL FixCut 25-2

Approved Combinations of Cutting Attachment, Deflector, Handle and Harness

Cutting Attachment Deflector Handle Harness / Shoulder

Strap

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

15

16

17

19

20

19

18

20

681BA120 KN

For safety reasons only the

cutting attachments, deflectors,

handles and harnesses/shoulder

straps shown in each row of the

table may be used together. No

other combinations are permitted

because of the risk of accidents.

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12

6 STIHL PolyCut 20-3

Metal mowing attachments

7 Grass cutting blade 230-2

8 Grass cutting blade 230-4

9 Grass cutting blade 230-8

Deflectors

10 Deflectoronly for mowing heads

11 Deflector with

12 Skirt and blade for all mowing heads

13 Deflector without skirt and blade for

all metal mowing attachments

Handles

14 Loop handle

15 Loop handlewith

16 Barrier bar

17 Bike handle

Harnesses

18 Shoulder strap may be used

19 Shoulder strap must be used

20 Full harness may be used

Mounting the handlebar

N Position the clamp (1) and

handlebar support (2) on the

shaft (3)

N Place the handlebar (4) in the

handlebar support – the rubber

handle (5) must be on the left

(viewing direction from engine to

handlebar)

N Place the clamp (6) on the

handlebar support

N Insert screws (7) through the holes

in the parts and screw them into the

clamp (6) as far as they will go

N Fasten handlebar (4) at a

distance (A) of approx. 15 cm (6 in)

ahead of the engine housing on the

shaft (3)

N Align the handlebar and tighten the

screws

Non-metal grass cutting blades

are not approved.

Mounting the Bike Handle

1

3

2

5

7

6

4

233BA025 KN

4

A

3

233BA018 KN

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13

Attaching the control handle

N Unscrew bolt (8) with a combination

wrench or Allen wrench – the nut (9)

remains in the control handle (10)

N Push the control handle with the

throttle trigger (11) facing toward

the gearbox onto the handlebar (4)

until the holes (12) align

N Screw in the bolt (8) and tighten up

Fasten the throttle cable

N Press throttle cable (13) into the

throttle cable support (14)

Loop handle with barrier bar

N Fit the square nuts (1) in the barrier

bar (2); the holes must line up.

Do not kink the throttle cable or

run it in tight radiuses – the

throttle trigger must move freely!

002BA357 KN

12

8

9

4

11

12

10

14

13

14

13

233BA027 KN

Mounting the Loop Handle

2

002BA098 KN

1

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14

N Fit the clamp (3) in the loop

handle (4) and place them both on

the drive tube (5).

N Place the clamp (6) in position.

N Place the barrier bar (2) in position

as shown.

N Line up the holes.

N Insert the screws (7) and tighten

them down moderately against the

barrier bar.

N Go to "Securing the loop handle".

Loop handle without barrier bar

N Fit the clamp (3) in the loop

handle (4) and place them both on

the drive tube (5).

N Place the clamp (6) in position.

N Line up the holes.

N Fit washers (7) on the screws (8)

and insert the screws in the holes.

Fit the square nuts (1) and screw

them down as far as stop.

N Go to "Securing the loop handle".

Securing the loop handle

N Secure the loop handle (4) about

20cm/8in (A) forward of the control

handle (9).

N Line up the loop handle.

N Tighten down the screws firmly –

lock the nuts if necessary.

The sleeve (10) (not fitted on all models)

must be between the loop handle and

the control handle.

5

4

002BA099 KN

2

3

6

7

4

5

002BA136 KN

1

6

1

3

8

7

8

7

10

9

4

002BA147 KN

A

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

15

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 Deflector

1 Deflector for mowing attachments

2 Deflector for mowing heads

Deflectors (1) and (2) are both mounted

to the gearbox in the same way.

N Place the deflector on the gearbox

flange.

N Insert the screws (3) and tighten

them down firmly.

Fitting the Skirt and Blade

N Slide the lower guide slot of the skirt

(4) onto the deflector (1) – it must

snap into position.

N Push the blade (5) into the upper

guide slot on the skirt and line it up

with the first hole.

N Insert the screw and tighten it down

firmly.

Fitting the Carrying Ring

002BA142 KN

1

2

1

Mounting the Deflector

002BA380 KN

2

1

3

These parts must be fitted to the

deflector (1) when you use a

mowing head.

4

1

5

4

002BA103 KN

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

16

Preparations

N Lay your brushcutter on its back so

that the cutting attachment

mounting face is facing up.

Mounting hardware for cutting

attachments

The mounting hardware supplied

depends on the cutting attachment that

comes as original equipment with the

new machine.

Mounting hardware is not packed

with machine

Only mowing heads can be mounted.

N Pull the hose (1) (protector for

shipping) off the shaft (2).

N Go to "Mounting the mowing head".

If you want to mount a metal cutting

attachment in place of a mowing head,

you will need the following additional

parts: Nut (3), rider plate (4) and thrust

washer (5) (special accessories).

Mounting hardware is packed with

machine

Mowing heads and metal cutting

attachments may be mounted.

If the parts are packed with the

machine

N Pull the hose (1) (protector for

shipping) off the shaft (2).

The nut (3), rider plate (4) and thrust

wsher (5) are in the parts kit supplied

with the machine.

N Go to "Mounting the mowing head"

or "Mounting the metal cutting

attachment".

If the parts are mounted to the

gearbox

N Go to "Removing the mounting

hardware".

Removing the mounting hardware

N Block the shaft – see next chapter

on "Blocking the output shaft".

N Use the combination wrench (6) –

comes standard with machine or is

available as special accessory – to

unscrew the nut (3) clockwise (left-

hand thread) from the shaft (2).

N Pull the thrust washer (5) off the

shaft (2).

The rider plate (4) is in the parts kit

supplied with the machine.

Mounting the Cutting

Attachment

002BA104 KN

2

002BA164 KN

1

3

4

5

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

17

N Go to "Mounting the mowing head"

or "Mounting the metal cutting

attachment".

Blocking the output shaft

N Insert the stop pin (7) or screwdriver

– come standard with machine or

are available as special accessories

– in the hole (8) in the gearbox as

far as stop, and apply slight

pressure.

N Rotate the nut or cutting attachment

on the shaft (2) until the stop pin

slips into position and blocks the

shaft.

Mounting the Mowing Head

Keep the instruction sheet for the

mowing head in a safe place.

STIHL SuperCut 20-2,

STIHL AutoCut 25-2,

STIHL AutoCut C 25-2,

STIHL TrimCut 31-2,

STIHL FixCut 25-2,

STIHL PolyCut 20-3

N Screw the mowing head

counterclockwise on to the shaft (1)

as far as stop.

N Block the shaft.

N Tighten down the mowing head.

Removing the Mowing Head

N Block the shaft.

STIHL SuperCut 20-2,

STIHL AutoCut 25-2,

STIHL AutoCut C 25-2,

STIHL TrimCut 31-2,

STIHL FixCut 25-2,

STIHL PolyCut 20-3

N Unscrew the mowing head

clockwise.

Adjusting Nylon Line

STIHL SuperCut

Fresh line is advanced automatically if

remaining line is still at least 6cm long.

The blade on the deflector trims surplus

line to the correct length.

STIHL AutoCut

N Hold the rotating mowing head

above the ground – tap it on the

ground once – about 3cm fresh line

is advanced.

The blade on the deflector trims surplus

line to the correct length – avoid tapping

the mowing head more than once at a

time.

Line feed operates only if both lines still

have a minimum length of 2.5 cm.

All other mowing heads

Refer to the instructions supplied with

the mowing head.

Replacing Nylon Line or Cutting

Blades

Refer to the instructions supplied with

the mowing head.

7

8

2

002BA166 KN

7

Remove the tool used to block the

shaft.

1

002BA081 KN

To reduce the risk of injury, always

shut off the engine before

adjusting the mowing line by

hand.

FS 55, FS 55 C, FS 55 R, FS 55 RC

English

18

Fitting metal cutting attachments

For the grass cutting blades 230-2 (1),

230-4 (2) and 230-8 (3) the attached

parts skirt and blade are not

necessary are not necessary on the

mowing tool deflector – see "Mounting

the deflector".

If the machine is supplied already

equipped with a metal cutting

attachment, then the correct thrust

plate (5, next fig.) is already mounted.

N Lay down the trimmer with the

mount for the cutting attachment

facing upward

With the grass cutting blades (1) and (2),

the cutting edges may face in either

direction.

With grass cutting blade (3), the cutting

edges must face clockwise.

N Position the blade (4) on the thrust

plate (5).

N Push the thrust plate (6) and rider

plate (7) onto the shaft (8)

N Block the shaft and screw the

nut (9) counterclockwise onto the

shaft and tighten it

Removing the metal cutting

attachment

N Block the shaft

N Unscrew the nut clockwise

N Remove parts from the shaft – do

not remove the thrust plate (5) in

doing so

This engine is certified to operate on

unleaded gasoline and with the mix ratio

50:1.

Your engine requires a mixture of high-

quality premium gasoline and high-

quality two-stroke air-cooled engine oil.

Use premium branded unleaded

gasoline with a minimum octane rating

of 89 RON.

Note: Models equipped with a catalytic

converter require unleaded gasoline. A

few tankfuls of leaded gasoline can

reduce the efficiency of the catalytic

converter by more than 50%.

Fuel with a lower octane rating may

result in preignition (causing "pinging")

which is accompanied by an increase in

engine temperature. This, in turn,

increases the risk of the piston seizure

and damage to the engine.

The chemical composition of the fuel is

also important. Some fuel additives not

only detrimentally affect elastomers

(carburetor diaphragms, oil seals, fuel

lines etc.), but magnesium castings as

well. This could cause running problems

or even damage the engine. For this

reason it is essential that you use only

high-quality fuels!

Fuels with different percentages of

ethanol are being offered. Ethanol can

affect the running behaviour of the

engine and increase the risk of lean

seizure.

For metal cutting attachments,

use a special version of the thrust

plate (5, next fig.) – to this end, if

necessary, have the machine

checked by a servicing dealer.

Observe the arrow for the

direction of rotation on the inside

of the mowing tool deflector.

1

2

3

681BA121 KN

The collar (arrow) must engage

the hole in the blade.

A nut that moves too easily should

be replaced.

681BA051 KN

6

9

7

8

5

4

Fuel

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