Stihl FS 361 C-M Setup guide

STIHL FS 361 C-M, 461 C-M
Owners Instruction Manual Instruction Manual
Manual de instrucciones
WARNING
Read Instruction Manual thoroughly before use and
follow all safety precautions – improper use can cause
serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina 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 - 56
Manual de instrucciones
57 - 117

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG 2021 0458-838-8601-A. VA0.K21. 0000009660_002_GB
0458-838-8601-A
English
1
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Guide to Using this Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Signal Words
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Symbols in Text
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Main Parts
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Available Cutting Attachments and Deflectors . . . . . . . 5
4 Safety Symbols on the Products
. . . . . . . . . . . . . . . . . . . . . 6
4.1 Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Deflector for Mowing Heads
. . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Deflector for Metal Cutting Attachments . . . . . . . . . . . . . 7
5 IMPORTANT SAFETY INSTRUCTIONS
. . . . . . . . . . . . . 7
5.1 Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 Intended Use
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.3 Operator
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4 Personal Protective Equipment . . . . . . . . . . . . . . . . . . . . . . 9
5.5 Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.6 Fueling Instructions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.7 Using the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . . 14
5.8 Working with the Cutting Attachments
. . . . . . . . . . . . . . 20
6 Maintenance, Repair and Storage
. . . . . . . . . . . . . . . . . . 24
6.1 Warnings and Instructions
. . . . . . . . . . . . . . . . . . . . . . . . . . 24
7 Before Starting Work
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 Preparing the Trimmer / Brushcutter for
Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8 Assembling the Trimmer / Brushcutter
. . . . . . . . . . . . . . 25
8.1 Mounting the Handlebar and Control Handle
. . . . . . . . 25
8.2 Mounting and Removing a Deflector or Limit Stop
. . . 26
8.3 Mounting and Removing a Mowing Head
. . . . . . . . . . . 27
8.4 Mounting and Removing a Metal Cutting
Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9 Adjusting the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . 29
9.1 Putting on and Adjusting the Full Harness
. . . . . . . . . . 29
9.2 Adjusting the Handlebar
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.3 Balancing the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . 30
10 Mixing Fuel and Refueling the Trimmer /
Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1 Mixing Fuel
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.2 Refueling the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . 32
11 Starting the Engine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.1 Starting the Engine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
12 Shutting Off the Engine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12.1 Shutting Off the Engine
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
13 Checking the Power Tool
. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13.1 Testing the Controls
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
14 During Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
14.1 Using the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . 36
14.2 Adjusting the Nylon Line
. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
15 Adjusting the Carburetor
. . . . . . . . . . . . . . . . . . . . . . . . . . . 37
15.1 STIHL M-Tronic Engine Management System
. . . . . . 37
15.2 Calibrating the Trimmer / Brushcutter
. . . . . . . . . . . . . . 38
15.3 Winter Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
15.4 Summer Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
16 After Finishing Work
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
16.1 Preparing for Transportation or Storage
. . . . . . . . . . . . 39
17 Transporting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
17.1 Transporting the Trimmer / Brushcutter
. . . . . . . . . . . . 40
18 Storing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
18.1 Storing the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . 40
19 Cleaning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
19.1 Cleaning the Trimmer / Brushcutter
. . . . . . . . . . . . . . . . 41
20 Inspection and Maintenance
. . . . . . . . . . . . . . . . . . . . . . . 42
20.1 Inspection and Maintenance Chart
. . . . . . . . . . . . . . . . . 42
20.2 Inspecting and Maintaining the Trimmer /
Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

0458-838-8601-A
2
English 1 Introduction
Thank you for your purchase. The information contained in
this manual will help you receive maximum performance and
satisfaction from your trimmer and, if followed, reduce the
risk of injury from its use.
The terminology utilized in this manual when referring to the
power tool reflects the type of cutting attachments that may
be mounted on it. The term "trimmer" is used to designate an
FS / FSA unit that is equipped with a nylon line head or a
head with flexible plastic blades (i.e., the PolyCut head.) The
term "brushcutter" designates a unit equipped with a rigid
metal blade. Many STIHL FS / FSA models, including this
power tool, may be used as either a trimmer or a
brushcutter. Therefore, the power tool is referred in this
manual as a "trimmer / brushcutter."
SAVE THIS MANUAL!
Have your authorized STIHL servicing dealer show you how
to operate your power tool.
Do not lend or rent the power tool without this instruction
manual. Allow only persons who fully understand the
information in this manual to operate the trimmer /
brushcutter.
For further information, or if you do not understand any of
the instructions in this manual, please go to
www.stihlusa.com or contact your authorized STIHL
servicing dealer.
20.3 Sharpening and Balancing a Metal Cutting
Attachment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
21 Troubleshooting Guide
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
21.1 Trimmer / Brushcutter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
21.2 Replacing the Air Filter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
21.3 Cleaning the Spark Plug
. . . . . . . . . . . . . . . . . . . . . . . . . . . 45
21.4 Adjusting the Throttle Cable
. . . . . . . . . . . . . . . . . . . . . . . . 46
22 Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
22.1 EPA / CARB
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
22.2 STIHL FS 361 C-M, 461 C-M
. . . . . . . . . . . . . . . . . . . . . . . 47
22.3 Symbols on the Power Tool and Deflector
. . . . . . . . . . 47
22.4 Engineering Improvements
. . . . . . . . . . . . . . . . . . . . . . . . . 48
23 Approved Deflector, Cutting Attachment and
Harness Combinations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
23.1 STIHL FS 361 C-M, 461 C-M
. . . . . . . . . . . . . . . . . . . . . . . 49
24 Replacement Parts and Equipment
. . . . . . . . . . . . . . . . . 51
24.1 Genuine STIHL Replacement Parts
. . . . . . . . . . . . . . . . 51
25 Disposal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
25.1 Disposal of the Power Tool
. . . . . . . . . . . . . . . . . . . . . . . . . 51
26 Limited Warranty
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
26.1 STIHL Incorporated Limited Warranty Policy
. . . . . . . 51
27 Emission Control Warranty
. . . . . . . . . . . . . . . . . . . . . . . . . 51
27.1 STIHL Incorporated Federal Emission Control
Warranty Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
27.2 STIHL Incorporated California Exhaust and
Evaporative Emissions Control Warranty
Statement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
28 Trademarks
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
28.1 Registered Trademarks
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
28.2 Common Law Trademarks
. . . . . . . . . . . . . . . . . . . . . . . . . 56
29 Addresses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
29.1 STIHL Incorporated
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
1 Introduction
Because a trimmer / brushcutter is a high-speed
cutting tool, special safety precautions must be
observed to reduce the risk of personal injury.
Read this instruction manual thoroughly before
use and periodically thereafter. Follow all safety
precautions. Careless or improper use can
cause serious or fatal injury.

0458-838-8601-A 3
English 2 Guide to Using this Manual
WARNING
As more fully explained later in this manual, to reduce the
risk of personal injury, make sure your unit is equipped with
the proper handle, harness and deflector for the type of
cutting attachment you are using. Use only cutting
attachments that are specifically authorized by STIHL for
use with this power tool. Always wear proper protective
apparel and eye protection. Bystanders, especially children,
and animals should not be allowed in the work area where
the trimmer is in use.
WARNING
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,
glass 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. Follow the safety
precautions in this manual to reduce the risk of personal
injury.
2.1 Signal Words
This manual contains safety information that requires your
special attention. Such information is introduced with the
following symbols and signal words:
DANGER
Indicates a hazardous situation that, if not avoided, will
result in death or serious injury.
WARNING
Indicates a hazardous situation that, if not avoided, could
result in death or serious injury.
NOTICE
Indicates a risk of property damage, including damage to the
machine or its individual components.
2.2 Symbols in Text
The following symbol is included to assist you with the use
of the manual:
2 Guide to Using this Manual
Refers to a designated chapter or sub-chapter in this
instruction manual.

0458-838-8601-A
4
English 3 Main Parts
3.1 Trimmer / Brushcutter
1 Air Filter Cover
Covers and protects the air filter element.
2 Air Filter
Filters the air drawn into the engine.
3 Shutter for Summer or Winter Operation
With summer and winter positions. Carburetor is heated
in winter position.
4Cap
Covers the spark plug boot.
5 Spark Plug Boot
Connects the spark plug with the ignition lead.
6 Spark Plug
Ignites the fuel-air mix in the engine.
7 Starter Grip
The grip of the pull starter for starting the engine.
8 Fuel Filler Cap
For closing the fuel tank.
9 Spacer
Designed to reduce the risk of burns and fire.
10 Muffler with Spark Arresting Screen
Reduces engine exhaust noise and diverts exhaust
gases away from the operator. The spark arresting
screen is designed to reduce the risk of fire.
11 Manual Fuel Pump
Provides additional fuel feed for a cold start.
12 Choke Lever
Eases engine starting by enriching mixture.
13 Carrying Strip
For connecting a harness to the trimmer / brushcutter.
14 Control Handle
Handle for the operator's right hand.
15 Throttle Trigger
Controls the speed of the engine.
16 Stop Switch
Switches the engine's ignition off and stops the engine.
17 Throttle Trigger Lockout
Prevents activation of the throttle trigger until depressed.
18 Clamp Screw
For securing the handlebar in the selected position.
19 Handle
Handle for the operator's left hand.
3Main Parts
1
25
15
2
43
19
14
18
11
12
20 26
22
23
16
17
21
13
5
7
6
8
24
910
#
0000099207_002

0458-838-8601-A 5
English 3 Main Parts
20 Handlebar
For holding and controlling the unit during operation.
21 Throttle Cable
For connecting the throttle trigger to the engine.
22 Drive Tube
Shaft of the power tool.
23 Gearbox
Covers the transmission system.
24 Opening for Stop Pin
Opening that allows the operator to block the output shaft
by inserting the stop pin.
25 Screw Plug
Seals the grease filler opening at the gearbox.
26 Stop Pin
Blocks the output shaft when mounting a cutting
attachment.
# Rating Plate
Contains the product's serial number.
3.2 Available Cutting Attachments and Deflectors
1 Deflector for Metal Cutting Attachments
Designed to reduce the risk of injury from thrown objects
and contact with the cutting attachment.
2 Grass Cutting Blade
Metal grass blade to cut matted and dry grass, ferns,
weeds and similar vegetation.
3Brush Knife
Metal brush blade to cut through heavy grass, weeds,
brush, scrub and similar vegetation.
4 Deflector for Mowing Heads
Designed to reduce the risk of injury from thrown objects
and contact with the cutting attachment.
5 Line Limiting Blade
Metal blade on the deflector that trims the nylon mowing
line to the proper length.
1
8
7
4
9
6
5
2
3
0000099209_001

0458-838-8601-A
6
English 4 Safety Symbols on the Products
6 Mowing Head
Mowing head for mounting nylon trimmer line.
7 Limit Stop
Designed for use with circular saw blades to position the
power tool steady against the wood and reduce the risk
of injury from blade thrust or kickout.
8 Circular Saw Blade
Metal blade for cutting wood.
9 Transport Guard
Designed to reduce the risk of injury from contact with a
metal cutting attachment while transporting the unit.
This power tool is sold with a cutting attachment and
appropriate deflector. Other cutting attachments and
appropriate deflectors are available as accessories.
4.1 Trimmer / Brushcutter
The following safety symbols are found on the trimmer /
brushcutter:
4.2 Deflector for Mowing Heads
The following symbols may be found on deflectors designed
for use with mowing heads:
4 Safety Symbols on the Products
To reduce the risk of injury, follow the specified
safety precautions.
Read and follow all safety precautions in the
instruction manual. Improper use can lead to
serious or fatal personal injury or property
damage.
To reduce the risk of eye injury and hearing loss,
always wear proper eye protection and hearing
protection. Wear an approved protective helmet
when there is a risk of head injury, @5.4.
Wear sturdy boots with non-slip soles. When
working with a metal cutting attachment, wear
steel-toed safety boots, @5.4.
Always wear non-slip, heavy-duty work gloves
(e.g. made of leather or other wear resistant
material) when handling the machine or metal
cutting attachments, @5.4.
Kickout (blade thrust) may cause loss of control
of the power tool resulting in serious or fatal
injury to the operator or bystanders. To reduce
the risk of injury, use extreme caution when
using a rigid blade, @5.8.1.
To reduce the risk of personal injury from thrown
objects, inspect the work area and remove
stones, glass, rocks, pieces of metal and other
objects that could be thrown by the cutting
attachment. @5.7.5.
To reduce the risk of personal injury
from thrown objects, keep bystanders
at least 50 ft. (15 m) away, @5.7.5.
The gearbox becomes hot during operation. To
reduce the risk of burn injury, avoid contacting
the gearbox while it is still hot following
operation, @6.
The deflector may be used in combination with
mowing heads.
The deflector must not be used in combination
with grass cutting blades.
15m (50ft)

0458-838-8601-A 7
English 5 IMPORTANT SAFETY INSTRUCTIONS
4.3 Deflector for Metal Cutting Attachments
The following symbols may be found on deflectors designed
for use with metal cutting attachments:
5.1 Introduction
WARNING
￭ 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, glass or bits of metal, it may throw or 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. As more fully explained later in this manual,
to reduce the risk of personal injury:
– Make sure your unit is equipped with the proper
handle, harness and deflector for the type of cutting
attachment you are using.
– Use only cutting attachments that are specifically
authorized by STIHL for use on your trimmer model.
￭ Do not lend or rent your trimmer without the instruction
manual. Be sure that anyone using it understands the
information contained in this manual. Have your dealer
show you how to operate your trimmer. Observe all
applicable laws, regulations, standards and ordinances.
5.2 Intended Use
WARNING
￭ When mounted with a mowing head or grass cutting
blade, this trimmer / brushcutter may be used for cutting
heavy grass, weeds and similar vegetation. When
mounted with a brush knife, it may be used for cutting
heavy grass, weeds, brush, scrub and similar vegetation
with a maximum diameter of 0.8 in. (20 mm). When
The deflector must not be used in combination
with brush knives.
The deflector must not be used in combination
with shredder blades.
The deflector must not be used in combination
with circular saw blades.
The deflector must not be used in combination
with mowing heads.
The deflector may be used in combination with
grass cutting blades.
The deflector may be used in combination with
brush knives.
The deflector must not be used in combination
with shredder blades.
The deflector must not be used in combination
with circular saw blades.
5 IMPORTANT SAFETY
INSTRUCTIONS

0458-838-8601-A
8
English 5 IMPORTANT SAFETY INSTRUCTIONS
mounted with a circular saw blade, it may be used for
thinning brush and cutting small trees up to a diameter of
2.8 in. (7 cm).
– Do not use it for any other purposes.
￭ Improper use could result in personal injury or property
damage, including damage to the power tool.
– Use the power tool only as described in this manual.
– Never attempt to modify or override the trimmer's /
brushcutter's controls or safety devices in any way.
– Never use a trimmer / brushcutter that has been
modified or altered from its original design.
5.3 Operator
WARNING
￭ Working with the trimmer / brushcutter can be strenuous.
The operator must be in good physical condition and
mental health. To reduce the risk of personal injury from
fatigue and loss of control:
– Check with your doctor before using the trimmer /
brushcutter if you have any health condition that may
be aggravated by strenuous work.
– Do not operate the trimmer / brushcutter while under
the influence of any substance (drug, alcohol or
medication, etc.) that might impair vision, balance,
dexterity or judgment.
– Be alert. Do not operate the trimmer / brushcutter
when you are tired. Take a break if you become
tired.
– Do not permit minors to use the trimmer /
brushcutter.
– Bystanders, especially children, and animals should
not be allowed in the area where the trimmer /
brushcutter is in use.
￭ Prolonged use of a trimmer / brushcutter (or other power
tools) exposing the operator to vibration may produce
white finger disease (Raynaud's phenomenon) or carpal
tunnel syndrome. These conditions reduce the hand's
ability to feel and regulate temperature. They produce
numbness and burning sensations and may also cause
nerve and circulation damage as well as tissue necrosis.
￭ All factors which contribute to white finger disease are not
known. 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 white finger disease.
￭ STIHL trimmer / brushcutters are equipped with an anti-
vibration ("AV") system designed to reduce the
transmission of vibration from the trimmer / brushcutter to
the operator's hands. To reduce the risk of white finger
disease and carpal tunnel syndrome:
– Wear gloves while working and keep your hands
warm.
– Keep the trimmer / brushcutter and its AV system
well maintained. A trimmer / brushcutter 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.
￭ These precautions do not guarantee that you will not
sustain white finger disease or carpal tunnel syndrome.
– Closely monitor the condition of your hands and
fingers if you are a regular operator.
– Seek medical advice immediately if any of the above
symptoms appear.
￭ The ignition system of this machine produces an
electromagnetic field of a very low intensity. This field may
interfere with some pacemakers or implanted medical
devices. To reduce the risk of injury:
– Persons with a pacemaker or other implanted
medical device should consult their physician and
the device manufacturer before operating this
trimmer / brushcutter.

0458-838-8601-A 9
English 5 IMPORTANT SAFETY INSTRUCTIONS
5.4 Personal Protective Equipment
WARNING
￭ Even a properly installed and adjusted deflector may not
protect the operator from all foreign objects thrown or
flung by the cutting attachment. Thrown objects may also
ricochet and strike the operator. To reduce the risk of
personal injury:
– Always wear proper clothing and protective apparel,
including proper eye protection.
￭ Loss of control and severe cut injuries may result if hair,
clothing or apparel make contact with the moving cutting
attachment or otherwise become entangled in the
components of the trimmer / brushcutter. To reduce the
risk of severe personal injury:
– Avoid loose-fitting jackets, scarves, neckties, flared
or cuffed pants, jewelry and any other apparel that
could be caught on branches, brush or the moving
cutting attachment.
– Secure hair above shoulder level before starting
work.
￭ To reduce the risk of eye injury:
– If there is a risk of facial injury, STIHL recommends
that you also wear a face shield or face screen over
your goggles or protective glasses.
￭ To reduce the risk of head injury:
– Wear an approved protective helmet when there is a
risk of head injury.
￭ Prolonged exposure to power tool noise may result in
permanent hearing damage. To reduce the risk of hearing
damage:
￭ Good footing is very important. To help maintain a secure
footing and reduce the risk of injury while working:
￭ To improve your grip and help protect your hands:
– Wear sturdy and snug-fitting clothing that
also allows complete freedom of
movement.
– Wear overalls or long pants made of
heavy material to help protect your legs.
Do not wear shorts.
– Always wear goggles or close-fitting
protective glasses with adequate side
protection that are impact-rated and
marked as complying with ANSI Z87 "+".
– Wear sound barriers (ear plugs or ear
muffs).
– Regular operators should have their
hearing checked periodically.
– Be particularly alert and cautious when
using hearing protection. Your ability to
hear shouts, alarms or other audible
warnings is restricted.
– Wear substantial footwear with non-slip
soles. Do not wear sandals, flip-flops,
open-toed or similar footwear. When
working with a metal cutting attachment,
wear steel-toed safety boots.
– Always wear heavy-duty non-slip work
gloves made of leather or another wear-
resistant material when handling the
trimmer / brushcutter.
– Always wear heavy-duty work gloves
when mounting or otherwise handling a
metal cutting attachment.

0458-838-8601-A
10
English 5 IMPORTANT SAFETY INSTRUCTIONS
5.5 Trimmer / Brushcutter
WARNING
￭ If the moving cutting attachment contacts you, it will result
in serious laceration injuries. To reduce the risk of such
injuries:
– Keep hands, feet and other parts of your body away
from the cutting attachment.
– Never touch the moving cutting attachment with your
hand or any other part of your body.
– Never operate the trimmer / brushcutter with a
damaged or missing deflector.
￭ To reduce the risk of personal injury to the operator and
bystanders from blade or line contact and thrown objects:
– Use of some cutting attachments will require you to
change the deflector and/or harness. See chapter
@23 of this manual for approved cutting
attachment, deflector and harness configurations.
￭ To reduce the risk of personal injury to the operator and
bystanders:
– Always shut off the engine before assembling,
transporting, adjusting, inspecting, cleaning,
servicing, maintaining or storing the trimmer /
brushcutter.
– Shut off the trimmer / brushcutter anytime it is not in
use.
￭ To reduce the risk of fire and explosion:
– Only use the spark plug specified in this instruction
manual and make sure it and the ignition lead are
clean and in good condition.
– Always press the spark plug boot snugly onto the
spark plug terminal of the proper size.
– Never test the ignition system with the spark plug
boot removed from the spark plug or with a removed
spark plug.
￭ Although certain unauthorized attachments may fit your
STIHL trimmer / brushcutter, their use may be extremely
dangerous. Only attachments supplied by STIHL or
expressly approved by STIHL for use with this specific
model are recommended.
– Use only attachments supplied or expressly
approved by STIHL.
– Never modify this trimmer / brushcutter in any way.
– Never attempt to modify or override the trimmer's /
brushcutter's controls or safety devices in any way.
– Never use a trimmer / brushcutter that has been
modified or altered from its original design.
– For a list of cutting attachments authorized by STIHL
for your unit, along with the approved deflector and
harness configurations, see Chapter @23 of this
instruction manual or the STIHL "Cutting
Attachments, Parts & Accessories" catalog,
available from your dealer or at www.stihlusa.com.
￭ Any modification to your muffler or spark arresting screen
could cause an increase in heat radiation, sparks or sound
level, thereby increasing the risk of fire, burn injury or
hearing loss. You may also permanently damage the
engine.
– Never modify your muffler or spark arresting screen.
￭ If the power tool is dropped or subjected to similar heavy
impacts:
– Check that it is undamaged, in good condition and
functioning properly before continuing work.
– Check that the fuel system is tight and has no leaks.
– Check that the controls and safety devices are
working properly, @13.1.
– Never work with a damaged or malfunctioning
trimmer / brushcutter. In case of doubt, have the
trimmer / brushcutter checked by your authorized
STIHL servicing dealer.
– Make sure your unit is equipped with the
proper deflector and harness for the type
of cutting attachment being used. Keep
the deflector and the attached skirt,
where appropriate, properly adjusted at
all times.

0458-838-8601-A 11
English 5 IMPORTANT SAFETY INSTRUCTIONS
￭ Genuine STIHL replacement parts are specifically
designed to match your power tool and meet safety and
performance requirements. Use of parts that are not
authorized or approved by STIHL may cause serious or
fatal injury or property damage.
– STIHL recommends that only identical STIHL
replacement parts be used.
5.6 Fueling Instructions
Fuel
WARNING
￭ Gasoline and its vapors are extremely flammable. Your
STIHL trimmer / brushcutter uses an oil-gasoline mixture
for fuel. If spilled and ignited by a spark or other ignition
source, it can cause fire and serious burn injury or
property damage.
Pick a Safe Location for Fueling
WARNING
￭ To reduce the risk of fire and explosion while fueling:
Allow the Engine to Cool Before Removing the Fuel Cap
WARNING
￭ Gasoline vapor pressure may build up inside the fuel tank.
The amount of pressure depends on a number of factors,
such as the fuel used, altitude, and temperature. To
reduce the risk of burns and other personal injury from
escaping gas, vapor and fumes:
– Always shut off the engine and allow it to cool before
removing the fuel cap.
￭ The engine is air cooled. When it is shut off, cooling air is
no longer drawn across the cylinder and engine
temperatures will rise for several minutes before starting
to cool. In hot environments, cooling will take longer. To
reduce the risk of burns and other personal injury from
escaping gas vapor and fumes:
– Allow the trimmer / brushcutter to cool. If you need
to refuel before completing a job, turn off the
machine and allow the engine to cool before opening
the fuel tank.
– Use extreme caution when handling
gasoline or fuel mix.
– Do not smoke or bring any fire or flame
near the fuel or the trimmer / brushcutter.
– Note that combustible fuel vapor may
escape from the fuel system.
– Always place the power tool on the
ground before attempting to fuel the
machine.
– Fuel your trimmer / brushcutter in a well-
ventilated area, outdoors away from
flames, pilot lights, heaters, electric
motors, and other sources of ignition.
Vapors can be ignited by a spark or
flame many feet away.
– Select bare ground for fueling and move
at least 10 ft. (3 m) from the fueling spot
before starting the engine.
– Wipe off any spilled fuel before starting
your trimmer / brushcutter.
– Take care not to get fuel on your
clothing. If this happens, change your
clothing immediately.

0458-838-8601-A
12
English 5 IMPORTANT SAFETY INSTRUCTIONS
Fuel Spraying or "Geysering"
WARNING
￭ Removing the cap on a pressurized fuel tank can result in
gasoline, vapors and fumes being forcefully sprayed out
from the fuel tank in all directions. The escaping gasoline,
vapors or fumes can cause serious personal injury,
including fire and burn injury, or property damage.
￭ Sometimes also referred to as “fuel geysering,” fuel
spraying is an expulsion of fuel, vapors and fumes which
can occur in hot conditions, or when the engine is hot, and
the tank is opened without allowing the trimmer /
brushcutter to cool adequately. It is more likely to occur
when the fuel tank is half full or more.
￭ Pressure is caused by fuel and heat and can occur even if
the engine has not been running. When gasoline in the
fuel tank is heated (by ambient temperatures, heat from
the engine, or other sources), vapor pressure will increase
inside the fuel tank.
￭ Some blends of gasoline, particularly winter blends, may
cause tanks to pressurize more quickly or create greater
pressure. At higher altitudes, fuel tank pressurization is
more likely.
How to Avoid Fuel Spraying
WARNING
￭ Removing the fuel cap on a pressurized tank can result in
gasoline, vapors and fumes being forcefully sprayed out
from the fuel tank in all directions. To reduce the risk of
burns, serious injuries or property damage from fuel
spraying:
– Follow the fueling instructions in this chapter.
– Always assume your fuel tank is pressurized.
– Allow the trimmer / brushcutter to cool before
removing the fuel cap.
– If you need to refuel before completing a job, turn off
the machine and allow the engine to cool before
removing the fuel cap. In hot environments, cooling
will take longer. The engine is air cooled. When it is
shut off, cooling air is no longer drawn across the
cylinder and the engine temperature will rise for
several minutes before starting to cool.
￭ After the trimmer / brushcutter has cooled appropriately,
follow the safety instructions in this chapter for removing
the cap.
– Never remove the cap by turning it directly to the
open position.
– First check for residual pressure by slowly turning
the cap approximately 1/2 turn counter-clockwise.
– The cap should be held in place by the threads while
allowing residual vapor/pressure to be relieved.
– Once any residual pressure has been relieved, turn
the cap until it can be removed from the tank
opening.
– Use only good quality fuel that is appropriate for the
season (summer v. winter blends). Some blends of
gasoline, particularly winter blends, are more volatile
and can contribute to fuel spraying.
Removing the Threaded Fuel Filler Cap
WARNING
￭
0000099186_001

0458-838-8601-A 13
English 5 IMPORTANT SAFETY INSTRUCTIONS
￭ After allowing the trimmer / brushcutter to cool, remove
the fuel filler cap slowly and carefully to allow any
remaining pressure build-up in the tank to release:
– While maintaining steady, downward pressure,
slowly turn the cap approximately 1/2 turn counter-
clockwise.
– If any significant venting occurs, immediately re-seal
the tank by turning the cap clockwise to the closed
position. Allow the trimmer / brushcutter to cool
further before attempting to open the tank.
– Turn the cap to the open position only after the
contents of the tank are no longer under pressure.
– Never remove the cap by turning it directly to the
open position without first allowing the trimmer /
brushcutter to cool adequately and then releasing
any residual pressure by slowly turning it
approximately 1/2 turn counter-clockwise.
– Never attempt to remove the cap while the engine is
still hot or running.
Installing the Threaded Fuel Filler Cap
WARNING
￭
￭ An improperly tightened fuel filler cap can loosen or come
off and spill quantities of fuel. To reduce the risk of fuel
spillage and fire from an improperly installed fuel cap,
correctly position the cap in the fuel filler opening and
tighten it by hand until it is secure.
Damaged or Broken Cap
WARNING
￭ If your fuel cap does not tighten properly, it may be
damaged or broken. Stop using the trimmer / brushcutter
and take it to your authorized STIHL dealer for repair.
Vapor Lock
WARNING
￭ Vapor lock occurs when fuel in the fuel line or carburetor
vaporizes, causing bubbles to block the free flow of liquid
fuel into the carburetor.
￭ Vapor lock cannot be relieved or affected by opening the
fuel tank. Removing the fuel filler cap without first allowing
the trimmer / brushcutter to cool adequately can result in
fuel spraying. Always follow the instructions in this section
when removing the fuel cap.
￭ To relieve vapor lock:
– Press the manual fuel pump bulb at least 20 to 30
times – even if the bulb is already filled with fuel – to
clear the vapor and send liquid fuel into the
carburetor. Then start the trimmer / brushcutter. For
specific starting instructions, see the appropriate
section of your instruction manual.
– If the manual fuel pump bulb does not fill after being
depressed several times, place the Choke Lever to
the start position and pull the starter cord until
the engine runs.
– If the engine does not fire after 10 pulls in the start
position start the engine in the run position .
– If your trimmer / brushcutter will not restart, or if
vapor lock occurs again, the trimmer / brushcutter is
being used in conditions too extreme for the fuel
being used. Discontinue use and let the engine cool
completely before attempting to start the trimmer /
brushcutter.
– Using good quality, fresh fuel (stored less than 30
days) also can help reduce the occurrence of vapor
lock.
0000099187_001

0458-838-8601-A
14
English 5 IMPORTANT SAFETY INSTRUCTIONS
5.7 Using the Trimmer / Brushcutter
5.7.1 Before Operation
WARNING
￭ Misuse or unauthorized use may result in personal injury
and property damage.
– Use the trimmer / brushcutter only as described in
this instruction manual.
￭ The cutting attachment and deflector must be an
approved combination.
– Read and follow the instructions on selecting the
proper cutting attachment and deflector, @23.
￭ The cutting attachment must be properly installed and
tightened before starting work. Failure to use the proper
parts to mount the cutting attachment may cause the
blade or mowing head to fly off and seriously injure the
operator or bystanders.
– Read and follow the instructions on mounting the
cutting attachment, deflector and handle, @8.
– Never mount a cutting attachment to the trimmer /
brushcutter without the proper installation of all
required parts (e.g., nuts, screws, thrust washer,
thrust plate, etc.).
– Before starting work, inspect for loose parts (nuts,
screws, etc.) and for a cracked or damaged head or
a cracked, bent, warped or damaged blade.
– Replace damaged or worn out heads or blades
before using the power tool.
– Always keep metal cutting attachments sharp.
￭ Using only an approved combination of cutting attachment
and deflector is extremely important to maximize cutting
performance and reduce the risk of personal injury from
thrown objects or contact with the cutting attachment:
– To reduce the risk of serious injury, never use wire
or metal-reinforced line or other material in place of
the recommended nylon cutting line. Pieces of wire
could break off and be thrown at high speed toward
the operator or bystanders.
￭ To reduce the risk of fire and explosion:
– Check fuel system for leaks, especially the visible
parts, (e.g., filler cap, hose connections).
– Securely mount the spark plug boot on the spark
plug.
– Do not start the engine if the fuel system has leaks
or the trimmer / brushcutter is otherwise damaged.
Have the trimmer / brushcutter repaired by an
authorized STIHL servicing dealer before using it.
￭ Using a trimmer / brushcutter that is modified, damaged,
improperly adjusted or maintained, or not completely and
securely assembled can lead to a malfunction and
increase the risk of serious personal injury or death.
– Never operate a trimmer / brushcutter that is
modified, damaged, improperly maintained or not
completely and securely assembled.
– Always check your unit for proper condition and
operation before starting work, particularly the
throttle trigger, throttle trigger lockout, stop switch,
deflector, harness and cutting attachment.
– Ensure that the throttle trigger, throttle trigger
lockout and stop switch move freely and spring back
into place when released. The throttle trigger must
not engage until the throttle trigger lockout is
depressed.
– Never attempt to modify or override the controls or
safety devices in any way.
– If your trimmer / brushcutter or any part is damaged
or does not function properly, take it to your
authorized STIHL servicing dealer. Do not use the
unit until the problem has been corrected.

0458-838-8601-A 15
English 5 IMPORTANT SAFETY INSTRUCTIONS
￭ Before starting the engine, take the following steps to
reduce the risk of personal injury from thrown objects, loss
of control or inadvertent contact with the cutting
attachment:
– Be sure that the cutting attachment is clear of you
and all other obstructions and objects, including the
ground.
– Read and follow the instructions on starting the
trimmer / brushcutter, @11.
5.7.2 Starting
WARNING
￭ To reduce the risk of burns and other personal injury from
escaping gas vapor and fumes:
– Move at least 10 ft. (3 m) from the fueling spot before
starting the engine.
– Start your trimmer / brushcutter only outdoors.
￭ To reduce the risk of serious or fatal injuries to the
operator or bystanders from loss of control:
– Start the trimmer / brushcutter only as described in
the "Starting" chapter in this manual, @11.
– Do not drop start. Drop starting means pushing the
trimmer / brushcutter away from the operator, or
allowing it to drop toward the ground, while pulling
on the starter grip. This method is very dangerous
because you may lose control of the trimmer /
brushcutter.
– When you pull the starter grip, do not wrap the
starter rope around your hand.
– Do not let the grip snap back. Guide the starter rope
to rewind it properly.
– Be sure that the cutting attachment is clear of you
and all other obstructions and objects, including the
ground.
– When the engine is started, the engine speed with
the starting throttle lock engaged will be fast enough
for the clutch to engage and move the cutting
attachment.
– Once the engine has started, immediately blip the
throttle trigger, which should cause the choke lever
to move to the run position and allow the engine to
slow down to idle.
5.7.3 Holding and Controlling the Trimmer / Brushcutter
WARNING
￭ To maintain a firm grip and properly control your trimmer /
brushcutter:
– Keep the handles clean and dry at all times. Keep
them free of moisture, pitch, oil, grease and resin.
￭ Operating the trimmer / brushcutter with one hand may
lead to loss of control and is extremely dangerous. To
reduce the risk of serious or fatal injury to the operator or
bystanders from loss of control:
￭
￭ To reduce the risk of serious or fatal injuries to the
operator or bystanders from loss of control:
– Place your right hand on the control handle and your
left hand on the other handle (see illustration). Left-
handers must follow these instructions too.
– Wrap your fingers tightly around the handles,
keeping the handles cradled between your thumb
and forefinger (see illustration).
– Never attempt to operate the trimmer /
brushcutter with one hand.
0000-GXX-7850-A0

0458-838-8601-A
16
English 5 IMPORTANT SAFETY INSTRUCTIONS
– Position the power tool so that all parts of your body
are clear of the cutting attachment whenever the
engine is running.
– The operator must use a harness as instructed in
this manual, @23
￭ When the unit is mounted with a metal cutting attachment,
the operator must take special precautions to reduce the
risk of severe injury from loss of control and contact with
the cutting blade:
– The operator must mount the proper deflector as
instructed in this manual, @8.2.
– The operator must use a harness, @9.1.
￭ Working with the cutting attachment above ground level or
perpendicular to the ground increases the risk of severe
injury from thrown objects. It also exposes more of the
cutting attachment and makes the unit more difficult to
control, increasing the risk of injury. To reduce the risk of
serious or fatal injury from loss of control or thrown
objects:
– Keep the cutting attachment at ground level, parallel
to the ground.
￭ To reduce the risk of serious or fatal injuries to the
operator or bystanders from contact with the cutting
attachment:
– Do not touch the cutting attachment while the engine
is running.
￭ To reduce the risk of serious or fatal cut injuries to the
operator or bystanders from loss of control, keep proper
footing and balance at all times:
– Make sure you have good balance and a secure
footing at all times.
– Never work on a ladder or while standing on any
other insecure support.
– Take special care in overgrown or wet terrain and
always watch for hidden obstacles such as tree
stumps, roots, rocks, holes and ditches to avoid
stumbling or falling.
– Be extremely cautious when working on slopes or
uneven ground.
– For better footing, always clear away fallen
branches, scrub, cuttings and other material, objects
or vegetation that can increase the danger of
slipping, tripping or falling.
– Never operate above waist height.
– Do not overreach.
￭ The trimmer / brushcutter should be balanced for proper
control and less fatigue during operation.
– Adjust the position of the handlebar and harness to
achieve and maintain a comfortable and effective
working position, @9.
5.7.4 Working Conditions
WARNING
￭ Operate your trimmer / brushcutter only under good
visibility during favorable daylight conditions.
– Postpone the work if the weather is windy, foggy,
rainy or inclement.
￭ Your trimmer / brushcutter is a one-person machine.
– Bystanders, especially children, and animals should
not be allowed in the area where it is in use.
– Switch it off immediately if you are approached.
￭ To reduce the risk of injury to bystanders and
unauthorized users:
– Never leave the trimmer / brushcutter unattended
when the engine is running.
– Shut off the engine during work breaks and any other
time the power tool is not in use.
– Keep hands, feet and other body parts
away from the cutting attachment.
– Never touch a moving cutting attachment
with your hand or any other part of your
body.

0458-838-8601-A 17
English 5 IMPORTANT SAFETY INSTRUCTIONS
￭ To reduce the risk of fire and explosion:
– Never operate the trimmer / brushcutter in a location
where combustible gases, liquids, vapors, dusts or
other combustible materials and substances are
present.
– To reduce the risk of fire from sparking, never
attempt to start the engine with the spark plug or
boot removed.
– Read and follow recommendations issued by
government authorities (e.g. OSHA) for identifying
and avoiding the hazards of combustible gases,
liquids, vapors, dusts or other combustible materials
and substances.
– Never modify the muffler or spark arresting screen.
￭ If a rotating metal blade strikes a rock or other hard object,
sparks may be created, which can ignite flammable
materials under certain circumstances. Flammable
materials can include dry vegetation and brush,
particularly when weather conditions are hot and dry.
– When there is a risk of fire or wildfire, do not use
metal blades around flammable materials or around
dry vegetation or brush.
– Contact your local fire authorities or the U.S. Forest
Service if you have any question about whether
vegetation and weather conditions are suitable for
the use of a metal blade.
– STIHL does not recommend the use of metal blades
when cutting in rocky areas or in areas with debris or
other objects that could create sparks.
￭ Some STIHL mowing heads have a metal core. High-
speed contact with rock or other hard objects may create
sparks, which can ignite flammable materials under
certain circumstances. Flammable materials include dry
vegetation and brush, particularly when weather
conditions are hot and dry.
– When there is a risk of fire or wildfire, do not use a
mowing head with a metal core around dry
vegetation or brush.
– Contact your local fire authorities or the U.S. Forest
Service if you have any question about whether
vegetation and weather conditions are suitable for
the use of a mowing head with a metal core.
– STIHL does not recommend using a mowing head
with a metal core when cutting in rocky areas or in
areas with debris or other objects that could create
sparks.
￭ As soon as the engine is running, it generates toxic
exhaust gases 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 or
illness from inhaling toxic exhaust gases:
￭ Use of this trimmer / brushcutter can generate dust and
other substances containing chemicals known to cause
respiratory problems, cancer, birth defects and other
reproductive harm.
– Consult governmental agencies such as EPA,
OSHA, CARB and NIOSH and other authoritative
sources on hazardous materials if you are unfamiliar
– Start and operate the trimmer /
brushcutter only outdoors in a well
ventilated work area. Never operate the
trimmer / brushcutter indoors, in confined
spaces or other poorly ventilated
locations.
– If exhaust fumes become concentrated
due to insufficient ventilation, shut off the
engine and clear obstructions from the
work area. Ensure proper ventilation
before resuming work.

0458-838-8601-A
18
English 5 IMPORTANT SAFETY INSTRUCTIONS
with the risks associated with the particular
substances you are cutting or with which you are
working.
￭ 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 or other airborne contaminants,
especially those with a smaller particle size, may cause
respiratory or other illnesses.
– Control dust at the source where possible.
– To the extent possible, operate the trimmer /
brushcutter so that the wind or operating process
directs any dust, mist or other particulate matter
raised by the trimmer / brushcutter away from the
operator.
– When respirable dust or other particulate matter
cannot be kept at or near background levels, always
wear a respirator that is approved by NIOSH and
rated for worksite-specific conditions. Follow the
recommendations of governmental authorities (e.g.,
OSHA/NIOSH) and occupational and trade
associations.
￭ If the vegetation being cut or the surrounding ground is
coated with a chemical substance, such as a pesticide or
herbicide:
– Read and follow the instructions and warnings that
accompanied the substance coating the vegetation
or surrounding ground.
5.7.5 Operating Instructions
WARNING
￭ In the event of an emergency:
– Shut off the engine immediately.
￭ To reduce the risk of personal injury from loss of control
and/or contact with the cutting attachment:
– Do not use your trimmer / brushcutter with incorrect
idle adjustment. When the idle speed is correctly
adjusted, the cutting attachment should not move
when the trimmer / brushcutter is running at idle. If it
does, have your STIHL dealer check your trimmer /
brushcutter and make proper adjustments and
repairs before use..
￭ The cutting attachment continues to rotate for a short
period after the throttle trigger is fully released. This is
known as the "flywheel effect." To reduce the risk of
serious personal injury from contact with the cutting
attachment:
￭ The rotating cutting attachment may fling foreign objects
directly or by ricochet a great distance. Thrown objects,
including broken cutting attachments, may cause serious
or fatal injury to the operator or bystanders. To reduce the
risk of severe personal injury:
– To reduce the risk of damage to property, also
maintain this distance from such objects as vehicles
and windows.
– Wait for the cutting attachment to stop
before walking with the unit or putting it
down.
– Inspect the work area. Remove stones,
glass, rocks, pieces of metal or other
objects that could be thrown by the
cutting attachment, damage the cutting
attachment or cause personal injury or
damage to property (e.g., parked
vehicles, windows).
– STIHL does not recommend the use of
rigid blades when cutting in rocky areas
or in areas where there is debris or other
objects that could be thrown by the
cutting attachment.
– Always wear proper eye
protection and keep bystanders
at least 50 ft. (15 m) away from
the work area. Any persons who
must enter the restricted area
must also wear proper eye
protection.
15m (50ft)