Este manual de instrucciones proporciona información de seguridad importante para el uso seguro de la cortadora STIHL FS 55. Debe leerse y seguirse para reducir el riesgo de lesiones graves o mortales causadas por el uso incorrecto de la máquina. Solo se deben usar accesorios autorizados por STIHL para este modelo.

1. STIH)
STIHL FS 55 Instruction Manual
Manual de instrucciones
Warning!
Read and follow all safety precautions in
Instruction Manual – improper use can cause
serious or fatal injury.
Advertencia!
Lea y siga todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto puede
causar lesiones graves o mortales.

2. English / USA
Contents
Guide to Using this Manual .............. 2 Checking the Spark Plug ................ 38 Allow only persons who understand this
BA_SE_012_006_01_13.fm
Safety Precautions and Working Rewind Starter ................................ 39 manual to operate your trimmer/
Techniques ....................................... 3 Storing the Machine ....................... 39 brushcutter.
Approved Combinations of Lubricating the Gearbox ................. 39 To receive maximum performance and
Mowing Tool, Deflector, Sharpening Metal Cutting Tools ..... 40 satisfaction from your STIHL trimmer/
Handle and Harness ....................... 18 Inspections and Maintenance brushcutter, it is important that you read
Mounting the Bike Handle .............. 20 by STIHL Service ........................... 41 and understand the maintenance and
Mounting the Loop Handle ............. 21 Maintenance Chart ......................... 42 safety precautions, starting on page 3,
Fitting the Carrying Eye .................. 22 Parts and Controls ......................... 43 before using your trimmer/brushcutter.
Mounting the Deflector ................... 23 Specifications ................................. 45
Mounting the Cutting Tools ............. 23 Special Accessories ....................... 46 Contact your STIHL dealer or the STIHL
Fuel ................................................ 28 Maintenance and Repairs .............. 47 distributor for your area if you do not
understand any of the instructions in this
Printing inks contain vegetable oils; paper can be recycled.
Fueling ............................................ 29 STIHL Incorporated
Fitting the Harness ......................... 29 Federal Emission Control manual.
Balancing the Brushcutter .............. 30 Warranty Statement ........................ 48
Starting / Stopping .......................... 31 STIHL Incorporated California !Warning!
Operating Instructions .................... 35 Exhaust and Evaporative Emissions Because a trimmer/brushcutter is a high-
Cleaning the Air Filter ..................... 35 Control Warranty Statement ........... 50 speed cutting tool some special safety
Motor Management ........................ 36 Trademarks .................................... 52 precautions must be observed to reduce
the risk of personal injury.
Printed on chlorine-free paper.
Adjusting the Carburetor ................ 36
Careless or improper use may cause
serious or even fatal injury. Make sure
your unit is equipped with the proper
deflector, handle and harness for the
type of cutting attachment being used.
Always wear proper eye protection.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improve-
ments are made from time to time. If the
0458 233 8621 C. M15. K7. CP. Printed in USA
operating characteristics or the appear-
ance of your trimmer/brushcutter differs
© ANDREAS STIHL AG & Co. KG, 2007
from those described in this manual,
please contact your STIHL dealer for
information and assistance.
STIHl
FS 55 1

3. English / USA
Guide to Using this Manual
Pictograms In addition to the operating instructions, Equipment and features
this manual may contain paragraphs
All the pictograms attached to the This instruction manual may refer to
that require your special attention. Such
machine are shown and explained in several models with different
paragraphs are marked with the
this manual. features. Components that are not
symbols described below:
installed on all models and related
The operating and handling instructions
Warning where there is a risk of an applications are marked with an
are supported by illustrations.
accident or personal injury or asterisk (*). Such components may
Symbols in text serious damage to property. be available as special accessories
from your STIHL dealer.
The individual steps or procedures Caution where there is a risk of
described in the manual may be marked damaging the machine or its
in different ways: individual components. Engineering improvements
: A bullet marks a step or procedure Note or hint which is not essential STIHL’s philosophy is to continually
without direct reference to an for using the machine, but may improve all of its products. As a result,
illustration. improve the operator’s under- engineering changes and improvements
standing of the situation and result are made from time to time. If the
A description of a step or procedure that in better use of the machine. operating characteristics or the
refers directly to an illustration may appearance of your machine differ from
Note or hint on correct procedure in those described in this manual, please
contain item numbers that appear in the
order to avoid damage to the contact your STIHL dealer for
illustration.
environment. assistance.
Example:
Loosen the screw (1) Therefore some changes, modifications
and improvements may not be covered
Lever (2) ... in this manual.
2 FS 55

4. English / USA
Safety Precautions and
Working Techniques
Because a trimmer/
brushcutter is a high- !Warning !Warning!
speed, fast-cutting power As more fully explained later in these The use of this machine may be
tool sometimes equipped Safety Precautions, to reduce the risk of hazardous. If the rotating line or blade
with sharp cutting blades, personal injury, make sure your unit is comes in contact with your body, it will
special safety precautions equipped with the proper handle, cut you. When it comes in contact with
must be observed to reduce the risk of harness and deflector for the type of solid foreign objects such as rocks or
personal injury. cutting attachment you are using. Use bits of metal, it may fling them directly or
only cutting attachments that are by ricochet in the direction of bystanders
It is important that you
specifically authorized by STIHL for use or the operator. Striking such objects
read, fully understand and
on your FS model. could damage the cutting attachment
observe the following
and may cause blades to crack, chip or
safety precautions and Have your STIHL dealer show you how
break. Thrown objects, including broken
warnings. Read the to operate your power tool. Observe all
heads or blades, may result in serious or
instruction manual and applicable local safety regulations,
fatal injury to the operator or bystanders.
the safety precautions periodically. standards and ordinances.
STIHL does not recommend the use of
Careless or improper use may cause
serious or fatal injury. !Warning! rigid blades when cutting in stony areas.
Do not lend or rent your power tool Use your trimmer/brushcutter equipped
The terminology utilized in this manual
without the instruction manual. Be sure with the appropriate cutting attachment
when referring to the power tool reflects
that anyone using it understands the only for cutting grass and similar
the fact that different types of cutting
information contained in this manual. material. It must not be used for any
attachments may be mounted on it. The
other purposes, since such misuse may
term quot;trimmerquot; is used to designate an
result in an accident or damage to the
FS unit that is equipped with a nylon line
machine.
head or a head with flexible plastic
blades (i.e., the PolyCut head). A !Warning!
quot;brushcutterquot; designates a unit
equipped with a rigid metal blade. Many Minors should never be allowed to use
FS models may be used as either a this power tool. Bystanders, especially
trimmer or a brushcutter - therefore, the children, and animals should not be
power tool is referred in this manual as a allowed in the area where it is in use.
quot;trimmer/brushcutter.quot; Some smaller
and/or lightweight FS models may only
be used as a trimmer, i.e., they may not
be used with metal blades.
FS 55 3

5. English / USA
THE OPERATOR These conditions reduce the hand's
!Warning! ability to feel and regulate temperature,
To reduce the risk of injury to bystanders
Physical Condition produce numbness and burning
and damage to property, never let your You must be in good physical condition sensations and may cause nerve and
power tool run unattended. When it is and mental health and not under the circulation damage and tissue necrosis.
not in use (e.g. during a work break), influence of any substance (drugs,
All factors which contribute to white-
shut it off and make sure that alcohol, etc.) which might impair vision,
finger disease are not known, but cold
unauthorized persons do not use it. dexterity or judgment. Do not operate
weather, smoking and diseases or
this machine when you are fatigued.
Most of these safety precautions and physical conditions that affect blood
warnings apply to the use of all STIHL !Warning! vessels and blood transport, as well as
trimmer/brushcutters. Different models high vibration levels and long periods of
Be alert – if you get tired, take a break.
may have different parts and controls. exposure to vibration are mentioned as
Tiredness may result in loss of control.
See the appropriate section of your factors in the development of whitefinger
Working with any power tool can be
instruction manual for a description of disease. In order to reduce the risk of
strenuous. If you have any condition that
the controls and the function of the parts whitefinger disease and carpal tunnel
might be aggravated by strenuous work, syndrome, please note the following:
of your model.
check with your doctor before operating
Safe use of a trimmer/brushcutter this machine. Most STIHL power tools are available
involves with an anti-vibration (“AV”) system
!Warning! designed to reduce the transmission of
1. the operator
Prolonged use of a power tool (or other vibrations created by the machine to the
2. the power tool machines) exposing the operator to operator's hands. An AV system is
3. the use of the power tool. vibrations may produce whitefinger recommended for those persons using
disease (Raynaud's phenomenon) or power tools on a regular or sustained
carpal tunnel syndrome. basis.
4 FS 55

6. English / USA
Keep the AV system well maintained. A Proper Clothing
power tool with loose components or !Warning!
To reduce the risk of injury, the operator
with damaged or worn AV buffers will Power tool noise may
should wear proper protective apparel.
tend to have higher vibration levels. damage your hearing.
Maintain a firm grip at all times, but do !Warning! Wear sound barriers (ear
plugs or ear mufflers) to
not squeeze the handles with constant, The deflector provided with your power
protect your hearing.
excessive pressure. Wear gloves and tool will not protect the operator from all
Continual and regular
keep your hands warm. Take frequent foreign objects (gravel, glass, wire, etc.)
users should have their hearing checked
breaks. thrown back by the rotating cutting
regularly.
All the above-mentioned precautions do attachment. Thrown objects may also
ricochet and strike the operator. Be particularly alert and cautious when
not guarantee that you will not sustain
wearing hearing protection because
whitefinger disease or carpal tunnel !Warning! your ability to hear warnings (shouts,
syndrome. Therefore, continual and
To reduce the risk of injury alarms, etc.) is restricted.
regular users should closely monitor the
condition of their hands and fingers. If to your eyes never Always wear gloves when
any of the above symptoms appear, operate your power tool handling the machine and
seek medical advice immediately. unless wearing goggles or metal blades. Heavy-duty,
properly fitted protective nonslip gloves improve
!Warning! glasses with adequate top your grip and help to
The ignition system of the STIHL unit and side protection complying with ANSI protect your hands.
produces an electromagnetic field of a Z 87.1 (or your applicable national
very low intensity. This field may standard). To reduce the risk of injury to Clothing must be sturdy
interfere with some pacemakers. To your face STIHL recommends that you and snug-fitting, but allow
reduce the risk of serious or fatal injury, also wear a face shield or face screen complete freedom of
persons with a pacemaker should over your goggles or protective glasses. movement. Wear long
consult their physician and the pants made of heavy
pacemaker manufacturer before material to help protect
operating this tool. your legs. Do not wear
shorts, sandals or go
barefoot.
FS 55 5

7. English / USA
Avoid loose-fitting jackets, THE USE OF THE POWER TOOL
scarfs, neckties, jewelry, !Warning!
flared or cuffed pants, Never modify this power tool in any way.
Transporting the Power Tool
unconfined long hair or Only attachments supplied by STIHL !Warning!
anything that could and expressly approved by STIHL for
To reduce the risk of injury from loss of
become caught on use with the specific STIHL model are
branches, brush or the moving parts of control and blade or line contact, never
authorized. Although certain
carry or transport your power tool with
the unit. Secure hair so it is above unauthorized attachments are useable
the cutting attachment moving.
shoulder level. with STIHL power tools, their use may, in
fact, be extremely dangerous. For the
Good footing is very
cutting attachments authorized by
important. Wear sturdy
STIHL for your unit, see the chapter
boots with nonslip soles.
“Approved Combinations of Cutting
Steel-toed safety boots
Attachment, Deflector, Handle and
are recommended.
Harness“ in the instruction manual or the
Wear an approved safety STIHL “Power Tools and Accessories“
hard hat to reduce the risk catalog.
of injury to your head
If this tool is subjected to unusually high
when there is a danger of
loads for which it was not designed (e.g.
head injuries.
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
THE POWER TOOL that the controls and safety devices are
389BA019 KN
For illustrations and definitions of the working properly. Do not continue
power tool parts see the chapter on operating this machine if it is damaged.
“Main Parts and Controls.” In case of doubt, have it checked by your
STIHL servicing dealer.
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.
6 FS 55

8. English / USA
Fueling Instructions Different models may be equipped with
!Warning! different fuel caps.
Always shut off the engine and make !Warning!
Cap with grip
sure the cutting attachment has stopped Fuel your power tool in well-ventilated
before putting a trimmer/brushcutter areas, outdoors. Always shut off the !Warning!
down. When transporting it in a vehicle, engine and allow it to cool before
In order to reduce the risk of fuel spillage
properly secure it to prevent turnover, refueling. Gasoline vapor pressure may
and fire from an improperly tightened
fuel spillage and damage to the unit. build up inside the fuel tank depending
fuel cap, correctly position and tighten
STIHL recommends that you keep metal on the fuel used, the weather conditions
the fuel cap in the fuel tank opening.
blades covered with the transport guard and the tank venting system.
(optional accessory). To do this with this STIHL
In order to reduce the risk of burns and
cap, raise the grip on the
other personal injury from escaping gas
top of the cap until it is
vapor, remove the fuel filler cap on your
Fuel upright at a 90° angle.
power tool carefully so as to allow any
Insert the cap in the fuel
Your STIHL power tool uses an oil- pressure build-up in the tank to release
tank opening with the
gasoline mixture for fuel (see the chap- slowly. Never remove the fuel filler cap
triangular marks on the grip of the cap
ter on “Fuel” of your instruction manual). while the engine is running.
and on the fuel tank opening lining up.
!Warning! Select bare ground for fueling and move Using the grip, turn the cap firmly
at least 10 feet (3 m) from the fueling clockwise as far as it will go (approx. a
Gasoline is an extremely quarter turn).
spot before starting the engine. Wipe off
flammable fuel. If spilled
any spilled fuel before starting your
and ignited by a spark or Fold the grip flush with the
machine.
other ignition source, it top of the cap. If the grip
can cause fire and serious !Warning! does not lie completely
burn injury or property flush with the cap and the
Check for fuel leakage while refueling detent on the grip does
damage. Use extreme caution when
and during operation. If fuel leakage is not fit in the
handling gasoline or fuel mix. Do not
found, do not start or run the engine until corresponding recess in the filler neck,
smoke or bring any fire or flame near the
the leak is fixed and any spilled fuel has the cap is not properly seated and
fuel or the power tool. Note that
been wiped away. Take care not to get tightened and you must repeat the
combustible fuel vapor may escape from
fuel on your clothing. If this happens, above steps.
the fuel system.
change your clothing immediately.
FS 55 7

9. English / USA
Screw cap
!Warning! !Warning!
!Warning! Do not attach any cutting attachment to Check that the spark plug boot is
Unit vibrations can cause a unit without proper installation of all securely mounted on the spark plug – a
an improperly tightened required parts. Failure to use the proper loose boot may cause arcing that could
fuel filler cap to loosen or parts may cause the blade or head to fly ignite combustible fumes and cause a
come off and spill off and seriously injure the operator or fire.
quantities of fuel. In order bystanders.
to reduce the risk of fuel ! Warning!
spillage and fire, tighten the fuel filler cap !Warning! To reduce the risk
by hand as securely as possible. The cutting attachment must be properly of personal injury
tightened and in safe operating to the operator
condition. Inspect for loose parts (nuts, from blade or line
screws, etc.) and for cracked or contact and
damaged heads or cracked, bent, thrown objects, make sure your unit is
Before Starting
warped or damaged blades. Replace equipped with the proper deflector,
!Warning! damaged heads or blades before using handle and harness for the type of
the power tool. Always keep blades cutting attachment being used (see
Always check your power tool for proper
sharp. chart in the chapter on quot;Approved
condition and operation before starting,
Combinations of Cutting Attachment,
particularly the throttle trigger, throttle Keep the handles clean and dry at all
Deflector, Handle and Harnessquot;).
trigger interlock, stop switch, cutting times; it is particularly important to keep
attachment, deflector and harness. The them free of moisture, pitch, oil, grease As can be seen in that chart, some
throttle trigger must move freely and or resin in order for you to maintain a firm cutting attachments may require you to
always spring back to the idle position. grip and properly control your power change your deflector, handle and/or
Never attempt to modify the controls or tool. harness.
safety devices. Never use a power tool
Keep the deflector (and the attached
that is damaged or not properly
skirt where appropriate) adjusted
maintained.
properly at all times (see chapters on
quot;Mounting the Deflectorquot; and quot;Mounting
the Cutting Attachmentsquot; of your
instruction manual).
8 FS 55

10. English / USA
.
Starting With the engine running only at idle,
A attach the power tool to the spring hook
Start the engine at least 10 feet
of your harness (see appropriate
(3 meters) from the fueling spot,
chapter of this manual).
outdoors only.
For specific starting instructions, see the !Warning!
000BA006 KN
appropriate section of your manual. Your power tool is a one-person
Place the power tool on firm ground or machine. Do not allow other persons in
other solid surface in an open area. the general work area, even when
Maintain good balance and secure starting.
Arrows on the deflector (A) (as seen footing.
from the underside) show the correct !Warning!
direction of rotation of the cutting !Warning! To reduce the risk of injury from loss of
attachment. When viewed from above, To reduce the risk of injury from blade or control, do not attempt to “drop start”
however, the cutting attachment rotates line contact, be absolutely sure that the your power tool.
counterclockwise. cutting attachment is clear of you and all
other obstructions and objects, including !Warning!
Adjust carrying harness and hand grip to
the ground, because when the engine When you pull the starter grip, do not
suit your size before starting work. The
starts at starting-throttle, engine speed wrap the starter rope around your hand.
machine should be properly balanced as
will be fast enough for the clutch to Do not let the grip snap back, but guide
specified in your instruction manual for
engage and move the cutting the starter rope to rewind it properly.
proper control and less fatigue in
attachment. Failure to follow this procedure may
operation. To be better prepared in case
of an emergency, practice releasing the Once the engine has started, result in injury to your hand or fingers
unit from the harness as quickly as immediately blip the throttle trigger, and may damage the starter
possible. which should release the starting throttle mechanism.
and allow the engine to slow down to
idle.
FS 55 9

11. English / USA
Important Adjustments During Operation
!Warning!
!Warning! Holding and controlling the power
Never attempt to operate
tool
To reduce the risk of personal injury from your power tool with one
loss of control or contact with the hand. Loss of control of
running cutting attachment, do not use the power tool resulting in
your unit with incorrect idle adjustment. serious or fatal injury may
At correct idle speed, the cutting result. To reduce the risk
attachment should not move. For of cut injuries, keep hands and feet away
002BA055 KN
directions on how to adjust idle speed, from the cutting attachment. Never
see the appropriate section of your touch a moving cutting attachment with
instruction manual. your hand or any other part of your body.
If you cannot set the correct idle speed,
have your STIHL dealer check your
power tool and make proper !Warning!
adjustments and repairs. 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
002BA054 KN
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
Always hold the unit firmly with both
uneven ground.
hands on the handles while you are
working. Wrap your fingers and thumbs !Warning
around the handles.
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.
10 FS 55

12. English / USA
Working conditions Operating instructions
!Warning!
Operate and start your power tool only
Inhalation of certain dusts, especially !Warning!
outdoors in a well ventilated area.
organic dusts such as mold or pollen, Do not operate your power tool using the
Operate it under good visibility and
can cause susceptible persons to have starting throttle lock, as you do not have
daylight conditions only. Work carefully.
an allergic or asthmatic reaction. control of the engine speed.
!Warning! Substantial or repeated inhalation of
In the event of an emergency, shut off
dust and other airborne contaminants, in
As soon as the engine is the engine immediately – move the slide
particular those with a smaller particle
running, this product control / stop switch to 0 or STOP.
size, may cause respiratory or other
generates toxic exhaust
fumes containing
illnesses. Control dust at the source !Warning!
where possible. Use good work
chemicals such as The cutting attachment
practices, such as operating the unit so
unburned hydrocarbons continues to rotate for a
that the wind or operating process
(including benzene) and carbon short period after the
directs any dust raised by the power tool
monoxide that are known to cause throttle trigger is released
away from the operator. Follow the
respiratory problems, cancer, birth (flywheel effect).
recommendations of EPA/OSHA/
defects, or other reproductive harm.
Some of the gases (e.g. carbon
NIOSH and occupational and trade !Warning!
associations with respect to dust
monoxide) may be colorless and The rotating cutting attachment may
(“particulate matter”). When the
odorless. To reduce the risk of serious or fling foreign objects directly or by
inhalation of dust cannot be substantially
fatal injury/illness from inhaling toxic ricochet a great distance.
controlled, i.e., kept at or near the
fumes, never run the machine indoors or
ambient (background) level, the
in poorly ventilated locations.
operator and any bystanders should
!Warning! wear a respirator approved by NIOSH/
MSHA for the type of dust encountered.
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.
FS 55 11

13. English / USA
15m (50ft)
!Warning! !Warning!
This trimmer/brushcutter is normally to A loose blade or head may vibrate,
be used at ground level with the cutting crack, break or come off the trimmer/
attachment parallel to the ground. Use of brushcutter, which may result in serious
a trimmer/brushcutter above ground or fatal injury. Make sure that the cutting
level or with the cutting attachment attachment is properly tightened. Use
To reduce the risk of eye and other injury perpendicular to the ground may the wrench supplied or one of sufficient
always wear proper eye protection (see increase the risk of injury, since the length to obtain the proper torque. If the
the chapter on “Proper Clothing“) and cutting attachment is more fully exposed blade or head loosens after being
ensure that bystanders are at least 50 and the power tool may be more difficult properly tightened, stop work
feet (15 m) away. To reduce the risk of to control. immediately. The retaining nut may be
damage to property, also maintain this worn or damaged and should be
distance from such objects as vehicles
!Warning! replaced. If the blade or head continues
or windows. Any coworkers who must be During cutting, check the tightness and to loosen, see your STIHL dealer. Never
in the restricted area should also wear the condition of the cutting attachment at use a trimmer/brushcutter with a loose
goggles or protective glasses. Stop the regular short intervals with the engine cutting attachment.
engine immediately if you are and attachment stopped. If the behavior
approached. of the attachment changes during use, !Warning!
stop the engine immediately, wait until Replace a cracked, damaged or worn-
!Warning! the cutting attachment stops, and check out head or a cracked, bent, warped,
Before you start work, the nut securing the attachment for damaged, dull or worn out blade
examine the area for tightness and the blade or head for immediately, even if damage is limited to
stones, glass, fence wire, cracks, wear and damage. superficial cracks. Such attachments
metal, trash or other solid may shatter at high speed and cause
objects. The cutting serious or fatal injury.
attachment could throw
objects of this kind.
12 FS 55

14. English / USA
!Warning! !Warning !Warning!
When using rigid blades, avoid cutting The gearbox becomes hot during Never modify your muffler. The muffler
close to fences, sides of buildings, tree operation. To reduce the risk of burn could be damaged and cause an
trunks, stones or other such objects that injury, do not touch the gear housing increase in heat radiation or sparks,
could cause the power tool to kick out or when it is hot. thereby increasing the risk of fire and
could cause damage to the blade. burn injury. You may also permanently
STIHL recommends use of the nylon line !Warning! damage the engine. Have your muffler
heads for such jobs. In addition, be alert The muffler and other parts of the engine serviced and repaired by your STIHL
to an increased possibility of ricochets in (e.g. fins of the cylinder, spark plug) servicing dealer only.
such situations. become hot during operation and remain
hot for a while after stopping the engine.
!Warning! To reduce risk of burns do not touch the Catalytic converter
If the head, blade or deflector becomes muffler and other parts while they are
clogged or stuck, always shut off the hot. !Warning!
engine and make sure the cutting Some STIHL power tools
attachment has stopped before !Warning! are equipped with a
cleaning. Grass, weeds, etc. should be To reduce the risk of fire and burn injury, catalytic converter, which
cleaned off the blade or from around the keep the area around the muffler clean. is designed to reduce the
head at regular intervals. Remove excess lubricant and all debris exhaust emissions of the
such as pine needles, branches or engine by a chemical
!Warning! leaves. Let the engine cool down sitting process in the muffler. Due to this
To reduce the risk of unintentional on concrete, metal, bare ground or solid process, the muffler does not cool down
rotation of the cutting attachment and wood away from any combustible as rapidly as conventional mufflers when
injury, always shut off the engine and substances. the engine returns to idle or is shut off.
remove the spark plug boot before To reduce the risk of fire and burn
replacing the cutting attachment. To injuries, the following specific safety
reduce the risk of injury, always shut off precautions must be observed.
the engine before adjusting the length of
the nylon line on manually adjustable
mowing heads.
FS 55 13

15. English / USA
USING THE CUTTING
!Warning! ATTACHMENTS
Since a muffler with a catalytic converter
For an illustration of the various cutting
cools down less rapidly than conven-
attachments and instructions on proper
tional mufflers, always set your power
mounting see the chapter on quot;Mounting
tool down in the upright position and
the Cutting Attachmentsquot; in your
never locate it where the muffler is near
instruction manual.
dry brush, grass, wood chips or other
combustible materials while it is still hot. !Warning!
!Warning! To reduce the risk of severe or fatal
injury from blade contact and/or loss of
An improperly mounted or damaged
control, never attempt to use a metal
cylinder housing or a damaged/
blade on an FS model for which it is not
deformed muffler shell may interfere
authorized.
with the cooling process of the catalytic
converter. To reduce the risk of fire or
000BA015 KN
burn injury, do not continue work with a
Using the Mowing Heads
damaged or improperly mounted
cylinder housing or a damaged/ Do not use with mowing line longer than
deformed muffler shell. the intended length. With a properly
mounted deflector, the built-in line- Mowing heads are to be used only on
Your catalytic converter is furnished with
limiting blade will automatically adjust trimmer/brushcutters equipped with a
screens designed to reduce the risk of
the line to its proper length. line-limiting blade in the deflector in
fire from the emission of hot particles.
order to keep the line at the proper
Due to the heat from the catalytic Using the unit with an overly long nylon
length (see quot;Parts and Controlsquot; chapter
reaction, these screens will normally cutting line increases the load on the
in your instruction manual).
stay clean and need no service or engine and reduces its operating speed.
maintenance. If you experience loss of This causes the clutch to slip If the lawn edges are planted with trees
performance and you suspect a clogged continuously and results in overheating or bordered by a fence etc., it is best to
screen, have your muffler maintained by and damage to important components use a nylon line head. It achieves a
a STIHL servicing dealer. (e.g. clutch, polymer housing quot;softerquot; cut with less risk of damaging
components). Such damage could, tree bark etc. than polymer blades.
among other things, cause the cutting
attachment to rotate at idle.
14 FS 55

16. English / USA
However, the polymer-bladed STIHL STIHL PolyCut mowing head STIHL FixCut mowing head
PolyCut produces a better cut if there
Uses pre-cut lengths of nylon line.
are no plants along the edge of the lawn.
Sharpening is not necessary, and worn Observe wear indicators.
polymer blades are easily replaced.
!Warning!
002BA177 KN
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
Uses either nylon lines or nonrigid,
the operator or bystanders.
pivoting polymer blades.
STIHL SuperCut mowing head
!Warning! Do not continue using the mowing head
Fresh line is advanced automatically.
Three rectangular wear limit marks are if the raised moldings (1) on the base are
Frayed line is replaced by a simple
applied to the base (periphery) of the missing or worn – see right illustration
adjustment (see instruction sheet
PolyCut. To reduce the risk of serious above. The mowing head may otherwise
supplied with mowing head).
injury from breakage of the head or shatter and flying objects could result in
STIHL TrimCut mowing head blades, the PolyCut must not be used injury to the operator or bystanders.
when it has worn as far as one of these Install a new mowing head.
Frayed line is replaced by a simple
adjustment (see instruction sheet marks. It is important to follow the
supplied with mowing head). maintenance instructions supplied with
the head.
STIHL AUTOCUT mowing head
Nylon cutting cord advances
automatically when tapped against the
ground (TapAction).
FS 55 15

17. English / USA
Risk of Kickout (Blade Thrust) Using the Grass Cutting Blade The 4-tooth grass cutting blade is
with All Rigid Cutting Blades intended to cut grass and weeds. It has
4 cutting knives with cutting edges on
both sides, i.e. front and rear. When the
cutting edges on one side become dull,
the blade can be turned over to utilize
the cutting edges on the other side.
The 8-tooth grass cutting blade is
002BA135 KN
recommended for cutting fern or reed.
Both types of grass cutting blade have to
be resharpened when all cutting edges
are dull.
!Warning!
Kickout (blade thrust) is the sudden and
uncontrolled motion towards the
operator's right or rear that can occur
000BA020 KN
when the shaded area (especially the
darkly shaded area) of a rotating blade
comes in contact with a solid rigid object
like a tree, rock, bush or wall. The rapid
counterclockwise rotation of the blade All kinds of grass and weeds can be
may be stopped or slowed, and the easily cut with the grass cutting blade.
cutting attachment may be thrown to the The power tool is swept in an arc similar
right or to the rear. to a scythe.
This kickout (blade thrust) may cause !Warning!
loss of control of the power tool and may
To reduce the risk of serious or fatal
result in serious or fatal injury to the
injury from blade breakage, never
operator or bystanders. To reduce the
attempt to use this blade to cut woody
risk of injury, extreme caution should be
materials.
used when cutting with the shaded area
of any rigid blade.
16 FS 55

18. English / USA
MAINTENANCE, REPAIR AND Wear gloves when handling or
STORING performing maintenance on blades. !Warning!
Do not operate your power tool if the
Maintenance, replacement, or repair !Warning! muffler is damaged, missing or modified.
of the emission control devices and
Use the specified spark plug, and make An improperly maintained muffler will
systems may be performed by any
sure it and the ignition lead are always increase the risk of fire and hearing loss.
nonroad engine repair establishment
clean and in good condition. Always If your muffler was equipped with a
or individual. However, if you make a
press spark plug boot snugly onto spark spark-arresting screen to reduce the risk
warranty claim for a component
plug terminal of the proper size. (Note: If of fire, never operate your power tool if
which has not been serviced or
terminal has detachable SAE adapter the screen is missing or damaged.
maintained properly or if
nut, it must be securely attached.) A Remember that the risk of forest fires is
nonapproved replacement parts were
loose connection between the spark greater in hot or dry weather.
used, STIHL may deny coverage.
plug and the ignition wire connector in
!Warning! the boot may create arcing that could !Warning!
ignite combustible fumes and cause a Never repair damaged cutting attach-
Use only identical STIHL replacement
fire. ments by welding, straightening or
parts for maintenance and repair. Use of
modifying the shape. This may cause
non-STIHL parts may cause serious or !Warning! parts of the cutting attachment to come
fatal injury.
Never test the ignition system with the off and result in serious or fatal injuries.
Strictly follow the maintenance and spark plug boot removed from the spark
Keep blades sharp. Tighten all nuts,
repair instructions in the appropriate plug or with a removed spark plug, since
bolts and screws, except the carburetor
sections of your instruction manual. uncontained sparking may cause a fire.
adjustment screws, after each use.
!Warning! Store the power tool in a dry and high or
Always stop the engine and make sure locked location out of reach of children.
that the cutting attachment is stopped Before storing for longer than a few
before doing any maintenance or repair days, always empty the fuel tank. See
work or cleaning the power tool. Do not chapter quot;Storing the Machinequot; in the
attempt any maintenance or repair work instruction manual.
not described in your instruction manual.
Have such work performed by your
STIHL servicing dealer only.
FS 55 17

19. English / USA
Approved Combinations of Mowing Tool, Deflector, Handle
and Harness
Mowing tools Harnesses Warning!
1 STIHL SuperCut 20-2 17 Shoulder strap may be used To reduce the risk of injury from
2 STIHL AutoCut C 25-2 18 Shoulder strap must be used thrown objects and blade contact,
never operate your unit without the
3 STIHL AutoCut 25-2 19 Full harnesss may be used proper deflector for the mowing
4 STIHL TrimCut 30-2 attachment being used. To reduce the
5 STIHL PolyCut 20-3 Equipment risk of injury from loss of control
and / or contact with the mowing tool,
6 STIHL FixCut 25-3 The complete unit includes: make sure your unit is equipped with
7 Grass cutting blade 230-4 a proper handle and harness for the
- Mowing tool
8 Grass cutting blade 230-8 - Deflector type of mowing attachment beeing
- Handle used.
- Harness (bike unit only)
Deflectors
9 Deflector for mowing heads Warning!
Select the correct combination from
10 Deflector for all mowing tools the table according to the mowing Stihl brushcutters with a loop handle
with tool you intend to use. Read the table without barrier bar may be used only
horizontally from left to right. Other with the above mentioned mowing
11 Skirt and blade
combinations, e.g. reading the table head with nylon line or plastic blades.
12 Deflector for all mowing tools Other plastic or metal mowing tool
without skirt and blade diagonally, are not permitted.
may only be used on brushcutters
with a bike-handle or loop-handle
with barrier bar in order to reduce the
Handles
risk of personal injury through
13 Loop handle contact with the mowing tool.
14 Loop handle with
15 Barrier bar
16 Bike handle
18 FS 55

20. 5
1
3
8
7
FS 55
4
6
2
Mowing tools
681FK003
681FK006
681FK011
681FK014
681FK111 KN
681FK037 KN
9
12
10
Deflectors
11
681FK021
681FK023
681BA002 KN
14
13
16
16
14
Handles
002BA002 K
002BA003 K 002BA003 K
15
15
002BA001 K 002BA001 K
18
18
17
002BA005 K 002BA005 K
Harnesses/Straps
19
19
002BA125 KN
002BA127 KN 002BA127 KN
English / USA
19

21. English / USA
Mounting the Bike Handle
5
11
A
7 4 10
6 12
8
4 3 9
2 4
233BA025 KN
233BA018 KN
3
233BA038 KN
1 12
Fitting the handlebar : Secure handlebar (4) on the drive Fitting the control handle
tube (3) at distance (A) of approx.
: Place the clamp (1) and handle : Release the screw (8) and remove it
15 cm (6 in) from the powerhead.
support (2) on the drive tube (3). with the washer. The nut (9) remains
: Align the handlebar. in the control handle (10).
: Position the handlebar (4) in the
handle support – the rubber grip (5) : Tighten down the screws firmly. : Push the control handle onto the
must be on the left (viewed from handlebar (4) – the throttle trigger
engine). (11) must point towards the
: Place clamp (6) on handle support. gearhead.
: Insert screws (7) in the holes and : Line up the holes (12).
screw down as far as stop in clamp. : Fit screw and washer in control
handle and tighten down firmly.
* see “Guide to Using this Manual”
20 FS 55

22. English / USA
Mounting the Loop Handle
13
14
2
14 4
233BA027 KN
13
2
3
Fitting the throttle cable
Do not kink the throttle cable - make
sure the throttle trigger moves freely. 1 5
: Push the throttle cable (13) into the 1
retainer (14). 6
002BA098 KN
002BA099 KN
7
Loop handle with barrier bar : Place the clamp (3) in the loop
handle (4) and position them both
: Insert square nuts (1) in the
against the drive tube (5).
barrier bar (2).
: Fit the clamp (6) and place the
: Line up the holes.
barrier bar (2) in position.
Note correct position.
: Line up the holes.
: Insert screws (7) in holes and screw
them into the barrier bar as far as
stop.
: Go to “Securing the loop handle”.
FS 55 21

23. English / USA
Fitting the Carrying Eye
8
8 7
7 4 1
A
9
4
10
3 1
5
6
2
002BA142 KN
002BA136 KN
002BA147 KN
1
1
Loop handle without barrier bar Securing the loop handle : For position of carrying eye1) see
quot;Parts and Controlsquot;
: Place the clamp (3) in the loop : Secure the loop handle (4)
handle (4) and position them both approx. 8”/20cm (A) forward of : Place the clamp (1) with the
against the drive tube (5). the control handle (9). tapped hole on the left-hand side
of the drive tube.
: Fit the clamp (6) and line up the : Line up the loop handle.
holes. : Squeeze the two ends of the clamp
: Tighten down the screws firmly –
together and hold in that position.
: Fit washers (7) on screws (8). lock the nuts if necessary.
: Insert M 6 x 14 screw (2).
: Insert screws (8) in holes and screw 10= Sleeve*
on the square nuts (1) as far as : Line up the carrying eye.
stop. : Tighten down the screw firmly.
: Go to “Securing the loop handle”.
1) Included as standard or available as
* see “Guide to Using this Manual” special accessory
22 FS 55

24. English / USA
Mounting the Deflector Mounting the Cutting Tools
1
4
002BA104 KN
4
3
1
2 Preparations
: Lay your brushcutter on its back
5 with the gearhead facing upward.
002BA102 KN
002BA103 KN
3
Mounting Hardware
for Cutting Tools
The mounting hardware supplied
Mounting the deflector Fitting skirt and blade depends on the cutting tool that comes
as original equipment with the new
1 = Deflector approved for all cutting These parts must be fitted to the
brushcutter.
tools deflector (1) when you use a
2 = Deflector approved for use with mowing head:
mowing heads only : Slide the lower guide slot of the Mounting hardware is not packed
: Place the deflector on the skirt (4) onto the deflector (1) – it with the machine
gearhead. must snap into position. Only mowing heads may be
: Fit the plate (3) and line it up. : Push the blade (5) into the upper mounted.
: Insert M 5 x 18 screws and tighten guide slot on the skirt and line it up
down firmly. with the first hole.
: Fit the screw and tighten it down
firmly.
FS 55 23

25. English / USA
Mounting hardware is packed with
the machine
3
Mowing heads and metal cutting
tools may be mounted.
4 Mounting hardware is loose
: Pull the hose (1) (protector for
5 shipping) off the shaft (2).
The nut (3), rider plate (4) and thrust
1 washer (5) are in the parts kit
supplied with the machine.
: Go to quot;Mounting the Mowing Headquot;
2 or quot;Mounting Metal Cutting Toolsquot;.
002BA164 KN
Mounting hardware is secured to
gearhead
: Pull the hose (1) (protector for : Go to quot;Removing Mounting Removing Mounting Hardware
shipping) off the shaft (2). Hardwarequot;
: Block the shaft – see next section
: Go to quot;Mounting the Mowing Headquot;.
on quot;Blocking the Output Shaftquot;.
If you want to mount a metal cutting
: Use the combination wrench (6)
tool in place of a mowing head, you
(supplied with machine or available
will need the following additional
as special accessory) to unscrew
parts: Nut (3), rider plate (4) and
the nut (3) clockwise (left-hand
thrust washer (5) (special
thread) from the shaft (2).
accessories).
: Pull the thrust washer (5) off the
shaft (2).
24 FS 55