STIHL FS 300, 350, 400, 450, 480
{
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.
Instruction Manual
1 - 46
Manual de
instrucciones
47 - 96
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Combinations of Cutting
Attachment, Deflector, Limit Stop
and Harness 16
Mounting the Bike Handle 18
Adjusting the Throttle Cable 19
Mounting the Deflector 19
Original Instruction ManualPrinted on chlorine-free paper
Mounting the Cutting Attachment 20
Fuel 23
Fueling 24
Fitting the Full Harness 25
Balancing the Trimmer/Brushcutter 25
Starting / Stopping the Engine 25
Operating Instructions 28
Cleaning the Air Filter 28
Engine Management 29
Adjusting the Carburetor 29
Winter Operation 30
Electric Handle Heating 31
Spark Plug 31
Printing inks contain vegetable oils, paper can be recycled.
Engine Running Behavior 32
Lubricating the Gearbox 32
Replacing the Starter Rope and
Rewind Spring 33
Storing the Machine 34
Sharpening Metal Cutting Blades 35
Maintenance and Care 36
Main Parts 38
Specifications 40
Special Accessories 43
Maintenance and Repairs 43
Allocation of STIHL Incorporated
Warranty Declarations 43
STIHL Incorporated Federal
Emission Control Warranty
Statement 44
Trademarks 46
Allow only persons who fully understand
this manual to operate your clearing
saw.
To receive maximum performance and
satisfaction from your STIHL clearing
saw, it is important that you read and
understand and follow the maintenance
and safety precautions in chapter
"Safety Precautions and Working
Techniques" before using your clearing
saw. For further information you can go
to www.stihlusa.com.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
Warning!
Because a clearing saw is a high-speed
cutting tool some special safety
precautions must be observed to reduce
the risk of personal injury. Careless or
improper use may cause serious or even
fatal injury. 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.
{
© ANDREAS STIHL AG & Co. KG, 2010
0458-255-8621-A. M0-25.E10.DDS.
0000000279_002_GB
FS 300, FS 350, FS 400, FS 450, FS 480
1
English
Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in this
manual.
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure
without direct reference to an
illustration.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols and signal words described
below:
Danger!
Indicates an imminent risk of severe or
fatal injury.
Warning!
Indicates a hazardous situation which, if
not avoided, could result in severe or
fatal injury.
Caution!
Indicates a risk of property damage,
including damage to the machine or its
individual components.
Engineering Improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differ from those
described in this manual, please contact
your STIHL dealer for assistance.
Safety Precautions and
Working Techniques
Because a clearing saw
is a high-speed, fast-cutting power tool
sometimes equipped with
sharp cutting blades,
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.
The terminology utilized in this manual
when referring to the power tool reflects
the fact that different types of cutting
attachments may be mounted on it. The
term "trimmer" is used to designate an
FS unit that is equipped with a nylon line
head or a head with flexible plastic
blades (i.e., the PolyCut head). A
"brushcutter" designates a unit
equipped with a rigid metal blade. Many
FS models may be used as either a
trimmer or a brushcutter – therefore, the
power tool is referred in this manual as a
"trimmer / brushcutter." Some smaller
and / or lightweight FS models may only
be used as a trimmer, i.e., they may not
be used with metal blades.
2
FS 300, FS 350, FS 400, FS 450, FS 480
The term "clearing saw" indicates a
high-powered trimmer / brushcutter that
is particularly suited for use with a
circular saw blade to clear saplings or
small trees.
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 deflector, limit
stop and harness for the type of cutting
attachment you are using. Use only cutting attachments that are specifically
authorized by STIHL for use on your FS
model.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
Warning!
Do not lend or rent your power tool without the instruction manual. Be sure that
anyone using it understands the information contained in this manual.
Warning!
The use of this machine may be hazardous. If the rotating line or blade comes in
contact with your body, it will cut you.
When it comes in contact with solid foreign objects such as rocks or bits of
metal, it may fling them directly or by ricochet in the direction of bystanders or
the operator. Striking such objects could
damage the cutting attachment and may
cause blades to crack, chip or break.
Thrown objects, including broken heads
or blades, may result in serious or fatal
injury to the operator or bystanders.
STIHL does not recommend the use of
rigid blades when cutting in stony areas.
Use your clearing saw equipped with the
appropriate cutting attachment only for
cutting grass, brush, wood 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.
English
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
clearing saws. 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 clearing saw 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.
FS 300, FS 350, FS 400, FS 450, FS 480
3
English
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
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
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!
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 Z 87.1 (or your
applicable national standard). To
reduce the risk of injury to your face
STIHL recommends that you also wear
a face shield or face screen over your
goggles or protective glasses.
Wear an approved safety hard hat to
reduce the risk of injury to your head
when there is a danger of head injuries.
Power tool noise may damage your
hearing. Wear sound barriers (ear plugs
or ear mufflers) to protect your hearing.
Continual and regular users should
have their hearing checked regularly.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
4
FS 300, FS 350, FS 400, FS 450, FS 480
English
Always wear gloves
when handling the
machine and metal
blades. Heavy-duty, nonslip gloves improve your
grip and help to protect
your hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Wear long
pants made of heavy
material to help protect
your legs. Do not wear
shorts, sandals or go
barefoot.
Avoid loose-fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants,
unconfined long hair or anything that
could become caught on branches,
brush or the moving parts of the unit.
Secure hair so it is above shoulder level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts."
Warning!
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, Limit Stop and
Harness" in the instruction manual or
the STIHL "Power Tools and 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 blade or 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 clearing saw down.
When transporting it in a vehicle, properly secure it to prevent turnover, fuel
spillage and damage to the unit. STIHL
recommends that you keep metal
blades covered with the transport guard
(optional accessory).
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel (see the
chapter on "Fuel" of your instruction
manual).
Warning!
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and seri-
ous burn injury or
property damage. Use extreme caution
when handling gasoline or fuel mix. Do
not smoke or bring any fire or flame near
the fuel or the power tool. Note that
combustible fuel vapor may escape
from the fuel system.
FS 300, FS 350, FS 400, FS 450, FS 480
5
English
Fueling Instructions
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, 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!
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.
Different models may be equipped with
different fuel caps.
Cap with Grip Screw Cap
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.
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 triangular marks on the grip
of the cap and on the fuel
tank opening lining up.
Using the grip, turn the
cap firmly clockwise as
far as it will go (approx. a
quarter turn).
Fold the grip flush with
the top of the cap. If the
grip does not lie completely flush with the cap
and the detent on the grip
does not fit in the corresponding recess in the
filler opening, the cap is
not properly seated and
tightened and you must
repeat the above steps.
Warning!
spillage and fire, tighten the fuel filler
cap by hand as securely as possible.
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!
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.
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. In order to
reduce the risk of fuel
6
FS 300, FS 350, FS 400, FS 450, FS 480
English
Warning!
The cutting attachment must be properly tightened and in safe operating
condition. Inspect for loose parts (nuts,
screws, etc.) and for cracked or damaged heads or cracked, bent, warped or
damaged blades. Replace damaged
heads or blades before using the power
tool. Always keep blades sharp.
Keep the handles clean and dry at all
times; it is particularly important to keep
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.
Warning!
To reduce the risk
of personal injury
to the operator
from blade or line
contact and
thrown objects, make sure your unit is
equipped with the proper deflector, limit
stop and harness for the type of cutting
attachment being used (see chart in the
chapter on "Approved Combinations of
Cutting Attachment, Deflector, Limit
Stop and Harness").
As can be seen in that chart, some
cutting attachments may require you to
change your deflector, limit stop and / or
harness.
Keep the deflector (and the attached
skirt where appropriate) adjusted
properly at all times (see chapters on
"Mounting the Deflector" and "Mounting
the Cutting Attachment" of your
instruction manual).
A
B
Arrows on the deflector (A) and limit
stop (B) (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 carrying harness and hand grip 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, practice 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
000BA006 KN
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,
000BA007 KN
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 (see appropriate
chapter of this manual).
Warning!
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
FS 300, FS 350, FS 400, FS 450, FS 480
7
English
Warning!
To reduce the risk of injury from loss of
control, do not attempt to "drop start"
your power tool.
Warning!
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
result in injury to your hand or fingers
and may damage the starter
mechanism.
Important Adjustments
Warning!
To reduce the risk of personal injury
from loss of control or contact with the
running cutting attachment, do not use
your unit with incorrect idle adjustment.
At correct idle speed, the cutting attachment should not move. For directions on
how to adjust idle speed, see the appropriate section of your instruction
manual.
If you cannot set the correct idle speed,
have your STIHL dealer check your
power tool and make proper
adjustments and repairs.
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
clearing saw handles and grips are in
good condition and free of moisture,
pitch, oil, fuel mix or grease.
Warning!
Never attempt to operate
your power tool with one
hand. Loss of control of
the power tool resulting in
serious or fatal injury may
result. To reduce the risk
of cut injuries, keep hands and feet
away from the cutting attachment.
Never touch a moving cutting attachment with your hand or any other part of
your body.
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.
002BA055 KN
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.
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.
8
FS 300, FS 350, FS 400, FS 450, FS 480
English
Warning!
As soon as the engine is
running, this product generates toxic exhaust
fumes containing chemicals, such as unburned
hydrocarbons (including
benzene) and carbon monoxide, that
are known to cause respiratory problems, cancer, birth defects, or other
reproductive harm. Some of the gases
(e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of
serious or fatal injury / illness from inhaling toxic fumes, never run the machine
indoors or in poorly ventilated locations.
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
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 cutting attachment
continues to rotate for a
short period after the
throttle trigger is released
(flywheel effect).
Warning!
The rotating cutting attachment may
fling foreign objects directly or by ricochet a great distance.
15m (50ft)
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. 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!
Before you start work,
examine the area for
stones, glass, fence wire,
metal, trash or other solid
objects. The cutting
attachment could throw
objects of this kind.
FS 300, FS 350, FS 400, FS 450, FS 480
9
English
Warning!
This clearing saw is normally to be used
at ground level with the cutting attachment parallel to the ground. Use of a
clearing saw 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. Never
use your clearing saw as a hedge
trimmer
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 blade or head for
cracks, wear and damage.
Warning!
A loose blade or head may vibrate,
crack, break or come off the clearing
saw, which may result in serious or fatal
injury. Make sure that the cutting attachment is properly tightened. Use the
wrench supplied or one of sufficient
length to obtain the proper torque. If the
blade or head loosens after being properly tightened, stop work immediately.
The retaining nut may be worn or damaged and should be replaced. If the
blade or head continues to loosen, see
your STIHL dealer. Never use a clearing
saw with a loose cutting attachment.
Warning!
Replace a cracked, damaged or wornout head or a cracked, bent, warped,
damaged, dull or worn out blade immediately, even if damage is limited to
superficial cracks. Such attachments
may shatter at high speed and cause
serious or fatal injury.
Warning!
When using rigid blades, avoid cutting
close to fences, sides of buildings, tree
trunks, stones or other such objects that
could cause the power tool to kick out or
could cause damage to the blade.
STIHL recommends use of the nylon
line heads for such jobs. In addition, be
alert to an increased possibility of ricochets in such situations.
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!
The gearbox becomes hot during operation. To reduce the risk of burn injury,
do not touch the gear housing when it is
hot.
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.
Warning!
To reduce the risk of fire and burn injury,
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!
Never modify your muffler. The muffler
could be damaged and cause an
increase in heat radiation or sparks,
thereby increasing the risk of fire and
burn injury. You may also permanently
damage the engine. Have your muffler
serviced and repaired by your STIHL
servicing dealer only.
10
FS 300, FS 350, FS 400, FS 450, FS 480
English
Catalytic Converter
Warning!
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
process in the muffler. Due to this process, the muffler does not cool down as
rapidly as conventional mufflers when
the engine returns to idle or is shut off.
To reduce the risk of fire and burn injuries, the following specific safety
precautions must be observed.
Warning!
Since a muffler with a catalytic converter
cools down less rapidly than conventional mufflers, 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
combustible materials while it is still hot.
Warning!
An improperly mounted or damaged cylinder housing or a damaged / deformed
muffler shell may interfere with the cooling process of the catalytic converter.
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 catalytic converter is furnished with
screens designed to reduce the risk of
fire from the emission of hot particles.
Due to the heat from the catalytic
reaction, these screens will normally
stay clean 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.
USING THE CUTTING ATTACHMENT
For an illustration of the various cutting
attachments and instructions on proper
mounting see the chapter on "Mounting
the Cutting Attachment" in your
instruction manual.
Warning!
To reduce the risk of severe or fatal
injury from blade contact and / or loss of
control, never attempt to use a metal
blade on an FS model for which it is not
authorized.
Using the Mowing Heads
Do not use with mowing line longer than
the intended length. With a properly
mounted deflector, the built-in linelimiting blade will automatically adjust
the line to its proper length.
Using the unit with an overly long nylon
cutting line increases the load on the
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.
000BA015 KN
Mowing heads are to be used only on
clearing saws equipped with a linelimiting 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.
FS 300, FS 350, FS 400, FS 450, FS 480
11
English
Warning!
To reduce the risk of serious injury,
never use wire or metal-reinforced line
or other material in place of the nylon
cutting lines. Pieces of wire could break
off and be thrown at high speed toward
the operator or bystanders.
STIHL SuperCut mowing head
Fresh line is advanced automatically.
Frayed line is replaced by a simple
adjustment (see instruction sheet
supplied with mowing head).
STIHL AutoCut mowing head
Nylon cutting line advances
automatically when tapped against the
ground (TapAction).
STIHL TrimCut mowing head
Frayed line is replaced by a simple
adjustment (see instruction sheet
supplied with mowing head).
STIHL PolyCut mowing head
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.
Risk of Kickout (Blade Thrust) with all
Rigid Cutting Blades
002BA177 KN
002BA135 KN
Warning!
Kickout (blade thrust) is the sudden and
uncontrolled motion towards the operator's right or rear that can occur 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 may
be stopped or slowed, and the cutting
attachment may be thrown to the right or
to the rear.
This kickout (blade thrust) may cause
loss of control of the power tool and may
result in serious or fatal injury to the
operator or bystanders. To reduce the
risk of injury, extreme caution should be
used when cutting with the shaded area
of any rigid blade.
12
FS 300, FS 350, FS 400, FS 450, FS 480
English
Using the Grass Cutting Blade
All kinds of grass and weeds can be
easily cut with the grass cutting blade.
The power tool is swept in an arc similar
to a scythe.
Warning!
To reduce the risk of serious or fatal
injury from blade breakage, never
attempt to use this blade to cut woody
materials.
The 4-tooth grass cutting blade is
intended to cut grass and weeds. It has
4 cutting knives with cutting edges on
both sides, i.e. front and rear. When the
cutting edges on one side become dull,
the blade can be turned over to utilize
the cutting edges on the other side.
The 8-tooth grass cutting blade is
recommended for cutting fern or reed.
Both types of grass cutting blade have to
be resharpened when all cutting edges
are dull.
Using the Brush Knife
When fitted to the power tool, the brush
knife is suitable for applications ranging
from cutting matted grass to clearing
weeds, wild growth and scrub.
To cut wild growth and scrub, lower the
000BA020 KN
rotating brush knife down onto the
growth to achieve a chopping effect –
but keep the tool below waist height at
all times.
Warning!
Exercise extreme caution when using
this method of cutting. The higher the
cutting attachment is off the ground, the
greater the risk of loss of control and of
cuttings being thrown sideways.
Use the power tool like a scythe to cut
grass, i.e. sweep it to and fro in an arc.
Warning!
When cutting woody materials, use the
left side of the blade to avoid "kickout"
(blade thrust) situations.
Warning!
Improper use of a brush knife may
cause it to crack, chip or shatter.
Thrown blade fragments may seriously
or fatally injure the operator or bystanders. To reduce the risk of injury, avoid
contact with hard or solid foreign objects
such as stones, rocks or pieces of
metal.
Warning!
When cutting young saplings or other
woody materials up to 2 cm (3/4 in.) in
diameter, use the left side of the blade
to avoid "kickout" situations (see section
on "Risk of kickout (blade thrust) with all
002BA066 KN
rigid cutting blades"). Do not attempt to
cut woody material with a larger diameter, since the blade may catch or jerk the
power tool forward. This may cause
damage to the blade or power tool or
loss of control of the power tool, resulting in personal injury. Use a circular saw
blade for such work.
Warning!
Inspect the brush knife at regular short
intervals for signs of damage. Do not
continue working with a damaged brush
knife. Resharpen the brush knife regularly (when it has dulled noticeably).
FS 300, FS 350, FS 400, FS 450, FS 480
13
English
Using the Circular Saw Blade
Circular saw blades are suitable for
thinning brush and cutting small trees up
to a diameter of 7 cm (2 3/4 in.). Do not
attempt to cut trees with larger
diameters, since the blade may catch or
jerk the clearing saw forward. This may
cause damage to the blade or loss of
control of the power tool and result in
serious injury. Use a chain saw for such
work.
Warning!
To reduce the risk that the blade will
crack and / or break, avoid all contact
with stones, rocks or the ground.
Sharpen blades in a timely manner as
specified – dull teeth may cause the
blade to crack or shatter.
When a clearing saw with a circular saw
blade is used to cut down small trees,
STIHL recommends that the standard
deflector be removed and replaced by
the special limit stop deflector (see
chapter on "Mounting the Deflector").
This limit stop helps to keep the unit
positioned against the tree during the
cutting process. Inexperienced users
should place the left side of the stop
against the tree trunk before beginning
to cut. This will keep the clearing saw
against the tree during the cutting
operation and will reduce the risk of loss
of control and possible kickout
(described above and briefly again
below).
000BA016 KN
Before starting the cut, accelerate the
engine up to full throttle. Perform cut
with uniform pressure. STIHL
recommends that the circular saw blade
be applied to the right of the tree, using
the non-shaded area of the blade, as
shown in the illustration above.
Warning!
The risk of kickout is highest when cutting in the darker shaded area. To
reduce the risk of kickout and resulting
injury, do not use this area of the circular
saw blade for cutting trees or shrubs.
Special techniques using the lighter
shaded areas of the blade to cut shrubs
and trees should only be used by experienced operators with specialized
training in the use and control of the
clearing saw.
002BA214 ST
When felling small trees, maintain a
distance of at least two tree lengths from
the nearest coworker.
Warning!
In order to reduce the risk of injury from
thrown objects or operator contact with
the blade or head, be sure to remount
the standard deflector when no longer
using a circular saw blade.
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
002BA068 KN
14
FS 300, FS 350, FS 400, FS 450, FS 480
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.
Wear gloves when handling or
performing maintenance on blades.
Warning!
Use the specified spark plug, and make
sure it and the ignition lead are always
clean and in good condition. Always
press the spark plug boot snugly onto
the spark plug terminal of the proper
size. (Note: If the terminal has a detachable SAE adapter nut, it must be
securely attached.) A loose connection
between the spark plug and the ignition
wire connector in the boot may create
arcing that could ignite combustible
fumes and cause a fire.
English
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. If your muffler was equipped with a
spark-arresting screen to reduce the
risk of fire, never operate your power
tool if the screen is missing or damaged.
Remember that the risk of forest fires is
greater in hot or dry weather.
Warning!
Never repair damaged cutting attachments by welding, straightening or
modifying the shape. This may cause
parts of the cutting attachment to come
off and result in serious or fatal injuries.
Keep blades sharp. Tighten all nuts,
bolts and screws, except the carburetor
adjustment screws, after each use.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Store the power tool in a dry and high or
locked location out of reach of children.
Before storing for longer than a few
days, always empty the fuel tank. See
chapter "Storing the Machine" in the
instruction manual.
FS 300, FS 350, FS 400, FS 450, FS 480
15
English
Approved Combinations of Cutting Attachment, Deflector, Limit Stop and Harness
Cutting attachment Deflector, Limit Stop Harness
14
11
1
2
3
16
4
5
15
20
17
6
7
8
18
9
10
21
12
13
19
16
256BA092 KN
FS 300, FS 350, FS 400, FS 450, FS 480
English
Approved Combinations
Among other parts, the complete
combination includes:
– Cutting attachment
– Deflector or limit stop
– Bike handle
– Harness
Select correct combination from the
table according to the cutting
attachment you intend to use.
Cutting attachments
Mowing heads
1 STIHL SuperCut 40-2
2 STIHL AutoCut 40-2
3 STIHL AutoCut 40-4
1)
4 STIHL TrimCut 41-2
5 STIHL PolyCut 40-3
Metal cutting attachments
6 Grass cutting blade 230-4
7 Grass cutting blade 255-8
8 Brush knife 300-3
9 Scratcher tooth circular saw blade
200
10 Chisel tooth circular saw blade 200
11 Scratcher tooth circular saw blade
12 Chisel tooth circular saw blade
13 Carbide tipped circular saw blade
225
225
225
2)
2)
2)
Non-metal grass cutting blades,
brush knives and circular saw
blades are not approved.
Deflectors, limit stops
Deflectors
14 Deflectoronly for mowing heads
15 Deflector with
16 Skirt and blade for mowing heads
(see "Mounting the Deflector").
17 Deflector without skirt and blade for
mowing tools 6 to 8
Limit stops
18 Limit stop for circular saw blades
200
19 Limit stop for circular saw blades
225
Harnesses
20 Full harness must be used
21 Deluxe full harness
Warning!
Based on the cutting attachment being
used:
Choose the proper deflector in order to
reduce the risk of injury from thrown
objects and contact with the cutting
attachment.
Make sure your unit is equipped with the
proper handle and harness in order to
reduce the risk of injury from loss of control and contact with the cutting
attachment.
Use grass cutting metal blades and
brush knifes on this unit only if equipped
with a bike handle or a loop handle with
barrier bar.
Use circular saw blades on this unit only
if equipped with a bike handle.
Do not use rigid plastic blades on this
unit.
FS 300, FS 350, FS 400, FS 450, FS 480
1)
for FS 450, 480 only
2)
for FS 400, 450, 480 only
17
English
Mounting the Bike Handle
2
3
1
N Hold the lower clamp (1) steady.
N Unscrew and remove the clamping
screw (2). The clamps are loose
once the clamping screw has been
removed.
N Remove the upper clamp (3) from
the lower clamp.
A
4
1
N Place the handlebar (4) in the lower
256BA001 KN
clamp (1) so that distance A is no
more than 6 in (15 cm).
N Place the upper clamp in position
and press it down.
N Insert the clamping screw.
N Line up the handlebar at a right
angle to the drive tube.
N Tighten down the clamping screw
firmly.
8
7
5
6
256BA002 KN
N Take out the screw (5), the nut (6)
remains in the control handle (7).
N Push the control handle onto the
end of the handlebar (4) until the
holes (9) line up – the throttle
trigger (8) must point towards the
gearbox.
N Insert the screw and tighten it down
firmly.
N Go to "Adjusting the Throttle Cable".
Transport and storage position: Loosen
the clamping screw, turn the handlebar
in line with the drive tube and fold the
handles down.
7
9
4
9
002BA256 KN
18
FS 300, FS 350, FS 400, FS 450, FS 480
English
Adjusting the Throttle
Cable
Some machine versions are equipped
with a throttle cable adjuster on the
control handle.
A properly adjusted throttle cable is the
precondition for correct operation in the
full throttle, starting throttle and idle
positions.
Adjust the throttle cable only after the
unit is fully assembled – the control
handle must be in the normal operating
position.
N Use a suitable tool to push the slide
to the end of the slot (see
illustration).
Mounting the Deflector
Deflector
1
3
1 Deflector for mowing attachments
2 Deflector for mowing heads
3 Plate
Mounting the Deflector
N Place the deflector and plate in
002BA163 KN
position.
N Insert the screws and tighten them
down firmly.
Stop
2 Limit stop for circular saw
blades 225
Mounting the limit stop
N Place the limit stop in position.
2
3
Circular saw blades 200:
N Insert the three M5x16 screws and
tighten them down firmly.
Circular saw blades 225:
N Insert the four M6x20 screws and
tighten them down firmly.
256BA085 KN
Fitting the skirt
2
5
4
1
STOP
2
1
249BA017 KN
N Press down the trigger interlock (1)
and squeeze the throttle trigger (2)
(full throttle) – this sets the throttle
cable correctly.
FS 300, FS 350, FS 400, FS 450, FS 480
1
1 Limit stop for circular saw
blades 200
2
3
The deflector (1) must be equipped with
the skirt (2) and blade (3) when mowing
002BA339 KN
heads are used.
002BA293 KN
19
English
N Slide the skirt (2) onto the
deflector (1) – use guide slot (4) for
all nylon line mowing heads.
N Push the blade (3) 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.
PolyCut 40-3 mowing head
N Slide the skirt into guide slot (5) for
the PolyCut 40-3.
Mounting the Cutting
Attachment
Blocking the Drive Shaft
2
1
N Insert the stop pin (1) in the bore (2)
in the gearhead as far as stop, apply
slight pressure.
N Rotate the shaft until the stop pin
slips into position.
Removing the Mounting Hardware
1
2
3
4
002BA294 KN
002BA295 KN
N Blocking the Drive Shaft
N Use the combination wrench (1) to
loosen and remove the nut (2)
clockwise.
N Remove the rider plate (3) and
thrust washer (4) (where fitted).
20
FS 300, FS 350, FS 400, FS 450, FS 480
English
Mounting the Guard Ring
3
2
4
The guard ring (1, 4) is included in the
scope of supply or available as a special
accessory.
For optimum protection from the ingress
of grass when using mowing tools:
N Mount the guard ring (1) for mowing
applications, fit the thrust plate (2)
and thrust washer (3).
Before mounting a circular saw blade:
N Remove the guard washer (3) and
thrust plate (2).
N Remove the guard ring (1) for
mowing applications.
N Fit the guard ring (4) for saw blades.
N Fit the thrust plate (2).
1
STIHL SuperCut, STIHL AutoCut,
STIHL TrimCut
002BA296 KN
1
N Blocking the Drive Shaft
N Screw the mowing head
counterclockwise onto the shaft (1)
and tighten it down firmly.
N Remove the tool used to block the
shaft.
Keep the instruction sheet for the
mowing head in a safe place.
Removing the mowing head
N Blocking the Drive Shaft
N Unscrew the mowing head
clockwise.
N Remove the tool used to block the
shaft.
STIHL PolyCut 40-3 Mowing Head
2
1
681BA124 KN
N Blocking the Drive Shaft
N Position the mowing head on the
shaft.
N Fit the thrust washer (1) – convex
side must face down.
N Screw on the nut (2)
counterclockwise and tighten it
down firmly.
Removing STIHL PolyCut 40-3
N Blocking the Drive Shaft
N Unscrew the mounting nut
clockwise.
N Remove the tool used to block the
shaft.
If the mounting nut has become
too loose, fit a new one.
002BA298 KN
FS 300, FS 350, FS 400, FS 450, FS 480
21
English
Adjusting Nylon Line
The instruction sheet supplied with the
mowing head contains a detailed
description.
SuperCut mowing head
Fresh line is advanced automatically
and trimmed to the correct length by the
blade on the deflector. Line feed
operates only if both lines are still at
least 2.4 in (6 cm) long.
AutoCut mowing head
Hold the rotating mowing head above
the grass surface.
N Tap it on the ground once – fresh
line is advanced and the blade on
the deflector trims it to the right
length.
Line feed operates only if both lines are
still at least 1.0 in (2.5 cm) long.
TrimCut mowing head
Shut off the engine – push the slide
control in the direction of the arrow on
the stop symbol (h) to STOP-0.
N Pull the spool up – rotate it about 1/6
turn counterclockwise until it
engages – and allow it to spring
back.
N Pull ends of the lines outward.
Repeat the above procedure as
necessary until both lines are 5.5 in
(14 cm) long.
Rotating the spool from one stop to the
next advances about 1.6 in (4 cm) of
fresh line.
Grass Cutting Blade, Brush Knife
1
Cutting attachments with 2, 3 or 2 blades
may point in either direction – these
cutting attachments must be turned over
regularly to help avoid one-sided wear.
The cutting edges on the grass cutting
blade 255-8 (3) must point clockwise.
N Fit the guard ring for mowing
applications.
2 3
4
3
2
b
1
a
N Place the cutting attachment (1) in
position.
Collar (a) must locate in the
cutting attachment's mounting
hole (b).
N Fit the thrust washer (2) – convex
side must face up.
N Fit the rider plate (3) (for mowing
applications).
N Blocking the Drive Shaft
N Screw on the nut (4)
681BA134 KN
002BA315 KN
counterclockwise and tighten it
down firmly.
Removing the cutting attachment
N Blocking the Drive Shaft
N Unscrew the mounting nut
clockwise.
If the mounting nut has become
too loose, fit a new one.
Circular saw blade
N Fit the guard ring for saw blades.
22
FS 300, FS 350, FS 400, FS 450, FS 480
English
4
3
2
b
1
a
N Place the cutting attachment (1) in
position – the cutting edges must
point clockwise.
Collar (a) must locate in the
cutting attachment's mounting
hole (b).
N Fit the thrust washer (2) – convex
side must face up.
N Fit the rider plate (3) (for saw
blades).
N Blocking the Drive Shaft
N Screw on the nut (4)
counterclockwise and tighten it
down firmly.
Removing the cutting attachment
N Blocking the Drive Shaft
N Unscrew the mounting nut
clockwise.
002BA300 KN
If the mounting nut has become
too loose, fit a new one.
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and quality two-stroke
air cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 (R+M/2). If
the octane rating of the mid-grade
gasoline in your area is lower, use
premium unleaded fuel.
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
nationally recognized high-quality
unleaded gasoline!
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke
engine oils that are designed for use
only in air cooled two-cycle engines.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
FS 300, FS 350, FS 400, FS 450, FS 480
23
English
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 canister from
your vehicle and place the canister on
the ground before filling. Do not fill fuel
canisters that are sitting in or on a
vehicle.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The machine‘s fuel tank and the canister
in which fuel mix is stored should be
cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved fuel-canisters only.
When mixing, pour oil into the canister
first, and then add gasoline. Close the
canister and shake it vigorously by hand
to ensure proper mixing of the oil with
the fuel.
Gasoline
Oil (STIHL 50:1 or equivalent high-quality oils)
US gal. US fl.oz
12.6
2 1/2 6.4
512.8
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Fueling
Before fueling, clean the filler cap and
the area around it to ensure that no dirt
falls into the tank.
Always thoroughly shake the mixture in
the can before fueling your machine.
In order to reduce the risk of burns
or other personal injury from
escaping gas vapor and fumes,
remove the fuel filler cap carefully
so as to allow any pressure buildup in the tank to release slowly.
After fueling, tighten down the
filler cap by hand as securely as
possible.
Change the fuel pickup body every
year.
Before storing your machine for a long
period, drain and clean the fuel tank.
Run the engine until the carburetor is
dry.
256BA060 KN
250BA051 KN
24
FS 300, FS 350, FS 400, FS 450, FS 480
English
Fitting the Full Harness
1
2
3
N Put on the full harness (1).
N Adjust the length of the strap so that
the spring hook (2) is about a hand’s
width below your right hip. Overlong ends of straps may be
shortened after completing the
adjustment.
N Attach the spring hook to the
machine's perforated strip (3).
Find the right attachment point for the
cutting attachment you are using – see
"Balancing the Brushcutter".
Balancing the
Trimmer/Brushcutter
The unit is balanced differently,
depending on the cutting attachment
used.
N With the unit suspended from the
harness, see how it is balanced and
change attachment point as
necessary:
Mowing attachments
002BA240 KN
Mowing heads, grass cutting blades and
brush knives should just touch the
ground.
Circular saw blades
Circular saw blades should "hover"
about 8 in. (20 cm) above the ground.
Starting / Stopping the
Engine
Control handle
Controls
STOP-
4
START
56
3
7
STOP
2
256BA016 KN
1 Throttle trigger interlock
2 Throttle trigger
3 Slide control
Positions of slide control
4STOP-0 – engine off – the ignition is
switched off
5 F – normal run position – the engine
is running or can start
6 START – the ignition is switched on
256BA017 KN
– the engine can start
1
002BA182 KN
FS 300, FS 350, FS 400, FS 450, FS 480
25
English
Symbol on slide control
7 h – stop symbol and arrow. To stop
the engine, push the slide control in
the direction of the arrow on the stop
symbol (h) to STOP-0.
Starting
N Press down the trigger interlock
lever and squeeze the throttle
trigger.
N and hold them in that position.
N Move the slide control to START
and hold it there.
N Now release the throttle trigger,
slide control and trigger interlock in
that order. This is the starting
throttle position.
9
8
N Set the choke knob (8):
g if the engine is cold
e for warm start – also use this posi-
tion if the engine has been running
but is still cold.
N Press the fuel pump bulb (9) at least
five times – even if the bulb is
already filled with fuel.
N Press in the decompression valve
button for each starting attempt.
250BA018 KN
Cranking
256BA094 KN
002BA038 KN002BA040 KN
N Place the unit on the ground: It must
rest securely on the engine support
and the deflector. Check that the
cutting attachment is not touching
the ground of any other obstacles.
N Make sure you have a firm footing.
N Hold the unit firmly on the ground
with your left hand and press down
– do not touch the throttle trigger or
throttle interlock – your thumb
should be under the fan housing.
Do not stand or kneel on the drive
tube.
26
FS 300, FS 350, FS 400, FS 450, FS 480
English
N Hold the starter grip with your right
hand.
N Pull the starter grip slowly until you
feel it engage and then give it a brisk
strong pull.
Do not pull out the starter rope all
the way – it might otherwise
break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking.
When the engine begins to fire:
N Turn the choke knob to e.
N Press in button to open the
decompression valve.
N Continue cranking until the engine
runs.
Make sure the carburetor is
correctly adjusted. The cutting
attachment must not rotate when
the engine is idling.
Your machine is now ready for
operation.
Shut off the engine
002BA072 KN
N Push the slide control in the
direction of the arrow on the stop
symbol (h) to STOP-0.
At very low outside temperatures:
As soon as the engine runs:
N Blip the throttle trigger to disengage
the starting throttle position. The
slide control moves to the normal
run position (F) – and the engine
settles down to idle speed.
N Open the throttle slightly.
N Warm up the engine for a short
period.
FS 400, 450: Change over to winter
mode if necessary – see section on
"Winter Operation".
If the engine does not start
N Turn the choke knob to e.
N Select the starting throttle
position.
N Start the engine by pulling the
starter rope briskly – 10 to 20 pulls
may be necessary.
If the engine still does not start
N Move the slide control to STOP-0.
N Remove the spark plug – see
"Spark Plug".
N Dry the spark plug.
N Open the throttle wide and hold it
that position.
N Crank the engine several times with
the starter to clear the combustion
chamber.
N Refit the spark plug – see "Spark
Plug".
N Move the slide control to START.
N Set the choke knob to e – even if
the engine is cold.
N Start the engine.
Throttle cable adjustment
N Check adjustment of throttle cable –
see chapter on "Adjusting the
Throttle Cable".
As soon as the engine runs
N Blip the throttle trigger
immediately. The slide control
moves to the normal run position F
– and the engine settles down to idle
speed.
FS 300, FS 350, FS 400, FS 450, FS 480
Choke knob
If you did not turn the choke knob to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
Fuel tank run until completely dry
N After refueling, press the fuel pump
bulb at least five times – even if the
bulb is filled with fuel.
N Set the choke knob according to
engine temperature.
N Start the engine.
27
English
Operating Instructions Cleaning the Air Filter
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This protects enginemounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-ofservice perionds – see "Storing the
Machine".
If there is a noticeable loss of engine
power
FS 300, FS 350
1
3
2
N Turn the choke knob to g.
N Press in the tab (1).
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter and inside the filter cover.
N Remove and check the filter
element (3) – replace if dirty or
damaged.
N Install the filter element in the filter
cover.
N Refit the filter cover.
FS 400, FS 450, FS 480
1
2
N Turn the choke knob to g.
N Loosen the screw (1).
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter and inside the filter cover.
N Remove and check the filter
element (3) – replace if dirty or
damaged.
N Install the filter element in the filter
cover.
N Refit the filter cover.
250BA022 KN
3
256BA074 KN
28
FS 300, FS 350, FS 400, FS 450, FS 480
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