Stihl FSA 120.0 R User manual

FSA 120.0 R
2 - 26 Instruction Manual

Contents
1 Introduction................................................. 2
2 Guide to Using this Manual.........................2
3 Overview..................................................... 3
4 Safety Precautions......................................4
5 Preparing Trimmer for Operation.............. 10
6 Charging the Battery, LEDs...................... 11
7 Activating and Deactivating Bluetooth®
Radio Interface..........................................11
8 Assembling the Trimmer........................... 11
9 Adjusting Trimmer for User....................... 14
10 Removing and Fitting the Battery..............15
11 Switching the Trimmer On/Off...................15
12 Testing the Trimmer and Battery.............. 15
13 Operating the Trimmer..............................16
14 After Finishing Work..................................17
15 Transporting..............................................17
16 Storing.......................................................18
17 Cleaning....................................................18
18 Maintenance............................................. 18
19 Repairing...................................................18
20 Troubleshooting........................................ 19
21 Specifications............................................20
22 Combinations of Cutting Attachments,
Deflectors and Carrying Systems............. 21
23 Spare Parts and Accessories....................22
24 Disposal.................................................... 22
25 EC Declaration of Conformity................... 22
26 UKCA Declaration of Conformity.............. 22
27 General Power Tool Safety Warnings.......23
1 Introduction
Dear Customer,
Thank you for choosing STIHL. We develop and
manufacture our quality products to meet our
customers’ requirements. The products are
designed for reliability even under extreme con‐
ditions.
STIHL also stands for premium service quality.
Our dealers guarantee competent advice and
instruction as well as comprehensive service
support.
STIHL expressly commit themselves to a sus‐
tainable and responsible handling of natural
resources. This user manual is intended to help
you use your STIHL product safely and in an
environmentally friendly manner over a long
service life.
We thank you for your confidence in us and hope
you will enjoy working with your STIHL product.
Dr. Nikolas Stihl
IMPORTANT! READ BEFORE USING AND
KEEP IN A SAFE PLACE FOR REFERENCE.
2 Guide to Using this Manual
2.1 Applicable documents
The local safety regulations apply.
► In addition to this User Manual, you should
also read, understand and retain the following
documents:
–User Manual and packaging of the cutting
attachment being used
–User manual of the carrying system you are
using
–User Manual for STIHL AR battery
–User Manual for "AP belt bag with connect‐
ing cable"
–Safety notices and precautions for
STIHL AP battery
–User Manual for STIHL AL 101, 301, 301-4,
500 chargers
–Safety information for STIHL batteries and
products with built-in battery:
www.stihl.com/safety-data-sheets
For further information on STIHL connected,
compatible products and FAQs, please visit
www.connect.stihl.com or available from a STIHL
servicing dealer.
The Bluetooth® word mark and logos are regis‐
tered trademarks owned by Bluetooth SIG, Inc.
These word marks and logos are used by STIHL
under license.
Batteries with are equipped with a Bluetooth®
radio interface. Local operating restrictions (in
aircraft or hospitals, for example) must be
observed.
2.2 Symbols used with warnings in
the text
WARNING
■ This symbol indicates dangers that can cause
serious injuries or death.
► The measures indicated can avoid serious
injuries or death.
English
2 0458-029-0101-A
© ANDREAS STIHL AG & Co. KG 2023
0458-029-0101-A. VA1.D23.
Printed on chlorine-free paper Paper is recyclable.
Translation of Original Instruction Manual
0000010294_003_GB

NOTICE
■ This symbol indicates dangers that can cause
damage to property.
► The measures indicated can avoid damage
to property.
2.3 Symbols in Text
This symbol refers to a chapter in this
instruction manual.
3 Overview
3.1 Brushcutter and Battery
#
7
8
6
45
9
1
#
3
2
12
14
11
10
13
15
16 17
18
0000100841_001
1 Battery compartment
The battery compartment holds the battery.
2 Locking lever
The locking lever holds the battery in the bat‐
tery compartment.
3 Control handle
The control handle is used for operating,
holding and controlling the brushcutter.
4 Carrying ring
The carrying ring is for attaching the carrying
system.
5 Power setting switch
The power setting switch is used to select the
power level.
6 Ergo lever
The Ergo lever holds the release slide in posi‐
tion when the trigger is released.
7 Trigger
The trigger switches the brushcutter on and
off.
8 Release slide
The release slide releases the trigger.
9 Loop handle
For holding and controlling the brushcutter.
10 Bump guard
The bump guard protect objects from contact
with the cutting attachment.
11 Shaft
The shaft connects all components.
12 Opening for stop pin
The opening for the stop pin accommodates
the stop pin.
13 Stop pin
The stop pin blocks the shaft while a cutting
attachment is being mounted.
14 Gear housing
The gear housing encloses the gearbox.
15 Battery
The battery supplies power to the brushcutter.
16 LEDs
The LEDs indicate the state of charge of the
battery and any faults.
17 Pushbutton
The pushbutton activates the LEDs on the
battery. The pushbutton activates and deacti‐
vates Bluetooth® radio interface (if available).
18 "BLUETOOTH®" LED (only for batteries with
)
The LED indicates the activation and deacti‐
vation of the Bluetooth® interface.
# Rating plate with the machine number
3.2 Deflectors and Cutting Attach‐
ments
The illustrations show examples of deflectors
and cutting attachments. Approved combinations
are listed in this instruction manual, 22.1.
3 Overview English
0458-029-0101-A 3

1
2
36
5
4
0000-GXX-4584-A0
1 Deflector for metal cutting attachments
The metal cutting tool guard protects the user
from thrown objects and contact with the
grass cutting blade or brush knife.
2 Grass Cutting Blade
Cuts grass and weeds.
3 Transport guard
Helps protect user from contact with metal
cutting attachments.
4 Line limiting blade
Line limiting blade trims nylon lines to correct
length.
5 Deflector for mowing heads
Protects user from flying debris and contact
with the mowing head.
6 Mowing head
Moving head accommodates the mowing
lines.
3.3 Symbols
Meanings of symbols that may be on the brush‐
cutter, deflector and battery:
1 LED lights up red. The battery is too
warm or too cold.
4 LEDs flash red. There is a fault in the
battery.
This symbol indicates the direction of
rotation of the cutting attachment.
This symbol shows the maximum
diameter of the cutting attachment in
millimeters.
This symbol shows the maximum speed of
the cutting attachment.
L
W
A
Guaranteed sound power level in
accordance with Directive 2000/14/EC
in dB(A) for the purpose of comparing
the sound emissions of products.
The battery is equipped with a Bluetooth®
interface and can be paired with the
STIHL connected app.
The information next to the symbol indi‐
cates the energy content of the battery
according to the cell manufacturer’s specifi‐
cation. The energy content available in
operation is lower.
Do not dispose of the product with domes‐
tic waste.
Maximum power level.
ECO power level.
4 Safety Precautions
4.1 Warning Signs
4.1.1 Warning Symbols
Meanings of warning signs and labels on the
brushcutter, battery and charger:
Observe safety warnings and take the
necessary precautions.
Read and understand the user manual
and keep it in a safe place for refer‐
ence.
Wear protective glasses.
If objects are likely to fall while working:
wear a hard hat.
Wear safety boots.
Wear work gloves.
Observe the safety information on kick‐
back and take the necessary precau‐
tions.
Comply with the safety instructions
concerning ejected objects and take
the necessary precautions.
15m (50ft)
Maintain a safe distance.
Remove the battery during work inter‐
ruptions, transport, storage, mainte‐
nance or repair.
English 4 Safety Precautions
4 0458-029-0101-A

Protect the battery against heat and
fire.
Do not immerse the battery in liquids.
Respect the required minimum
distance between the loop han‐
dle and the cutting attachment.
4.1.2 Deflector for mowing heads
Meanings of warning signs and labels on the
deflector for mowing heads:
Use this deflector for mowing heads.
Do not use this deflector for grass cut‐
ting blades.
4.2 Intended Use
The STIHL FSA 120.0 R brushcutter is designed
for the following applications:
–With a mowing head: mowing grass
–With a grass cutting blade: mowing grass and
weeds
The brushcutter may be used in the rain.
The brushcutter is powered by a STIHL AP bat‐
tery or a STIHL AR battery.
The battery with in combination with the
STIHL connected app enables customization and
the transfer of information to the battery using
Bluetooth® technology.
WARNING
■Batteries not explicitly approved for the brush‐
cutter by STIHL may cause a fire or an explo‐
sion. Persons may be seriously or fatally
injured, and property may be damaged.
►Use the brushcutter with a STIHL AP bat‐
tery or a STIHL AR battery.
■ Using the brushcutter or the battery for purpo‐
ses for which they were not designed may
result in serious or fatal injuries and damage
to property.
►Use the brushcutter as described in this
user manual.
► Use the battery as described in this user
manual, the STIHL AR battery user manual,
the STIHL connected app and at www.con‐
nect.stihl.com.
4.3 The Operator
WARNING
■Users without adequate training or instruction
cannot recognize or assess the risks involved
in using the trimmer and battery. The user or
other persons may sustain serious or fatal
injuries.
► Read, understand and save the
instruction manual.
► If the trimmer or battery are passed on to
another person: Always give them the
instruction manual.
►Make sure the user meets the following
requirements:
–The user must be rested.
–The user must be in good physical con‐
dition and mental health to operate and
work with the trimmer and battery. If the
user’s physical, sensory or mental abil‐
ity is restricted, he or she may work only
under the supervision of or as instructed
by a responsible person.
–The user is able to recognize and
assess the risks involved in using the
trimmer and battery.
–The user must be of legal age or is
being trained in a trade under supervi‐
sion in accordance with national rules
and regulations.
–The user has received instruction from a
STIHL servicing dealer or other experi‐
enced user before working with the trim‐
mer for the first time.
–The user must not be under the influ‐
ence of alcohol, medication or drugs.
► If you have any queries: Contact a STIHL
servicing dealer for assistance.
4.4 Clothing and equipment
WARNING
■Long hair can be drawn into the brushcutter
during operation. This may result in serious
injury to the user.
►Tie up and confine long hair above your
shoulders.
■ Objects can be thrown at high speed during
operation. This may result in injury to the user.
4 Safety Precautions English
0458-029-0101-A 5

► Wear close-fitting safety glasses.
Suitable safety glasses are tested in
accordance with EN 166 or national
regulations and available commer‐
cially with the corresponding mark‐
ing.
►Wear face protection.
► Wear long trousers made from resistant
material.
■ Falling objects can cause head injuries.
► If objects are likely to fall while work‐
ing: wear a hard hat
■ Dust can be whipped up during operation.
Whipped up dust can damage the respiratory
passages and cause allergic reactions.
►If dust is generated: Wear a dust respirator
mask.
■ Inappropriate clothing can snag on wood,
brush or the brushcutter. Users not wearing
suitable clothing are at risk of serious injury.
►Wear close-fitting clothing.
► Remove scarves and jewelry.
■ The user may come into contact with the rotat‐
ing cutting attachment during operation. This
may result in serious injury to the user.
►Wear robust footwear.
► If you are using a metal cutting
attachment: Wear steel-toed safety
boots.
► Wear long trousers made from resistant
material.
■ There is a risk of the user coming into contact
with the cutting attachment or the line limiting
blade during cleaning and maintenance work
and when the cutting attachment is mounted
or removed. This may result in injury to the
user.
► Wear work gloves made from resist‐
ant material.
■ Wearing unsuitable footwear may cause the
user to slip. This may result in injury to the
user.
►Wear sturdy, closed-toed footwear with
high-grip soles.
4.5 Work Area and Surroundings
4.5.1 Brushcutter
WARNING
■Bystanders, children and animals are not
aware of the dangers of the brushcutter or fly‐
ing debris. This may result in serious injury to
bystanders, children and animals and damage
to property.
15m (50ft)
► Do not allow bystanders,
children or animals within 15
meters of the work area.
► Maintain a clearance of 15 meters from
objects.
► Do not leave the brushcutter unattended.
► Make sure that children cannot play with
the brushcutter.
■ Electrical components of the brushcutter can
produce sparks. Sparks may cause fires and
explosions in highly flammable or explosive
environments. Persons may be seriously or
fatally injured and property may be damaged.
►Do not work in a highly flammable or explo‐
sive environment.
4.5.2 Battery
WARNING
■ Bystanders, children and animals cannot rec‐
ognize or assess the dangers of the battery.
Bystanders, children and animals may be seri‐
ously injured.
►Keep bystanders, children and animals
away from the work area.
► Do not leave the battery unattended.
► Make sure that children cannot play with
the battery.
■ The battery is not protected against all ambi‐
ent conditions. If the battery is exposed to cer‐
tain ambient conditions, the battery may catch
fire, explode or be irreparably damaged. This
may result in serious injury to people and
damage to property.
► Protect battery from heat and fire.
► Do not throw the battery into a fire.
► Do not charge, use and store the battery
outside of the specified temperature limits,
21.3.
► Do not immerse the battery in liq‐
uids.
► Keep battery away from small metal parts.
► Do not expose the battery to high pressure.
► Do not expose the battery to microwaves.
► Protect the battery from chemicals and
salts.
English 4 Safety Precautions
6 0458-029-0101-A

4.6 Safe Condition
4.6.1 Brushcutter
The brushcutter is in a safe condition if the fol‐
lowing points are observed:
–The brushcutter is not damaged.
–The brushcutter is clean.
–The controls function properly and have not
been modified.
–A combination of cutting attachment and
deflector recommended in this user manual is
mounted.
–The cutting attachment and deflector are prop‐
erly mounted.
–Genuine STIHL accessories for this brushcut‐
ter are fitted.
–The accessories are correctly attached.
WARNING
■ If not in safe condition, components may no
longer operate correctly and safety devices
may be disabled. This may result in serous or
fatal injury to people.
►Work only with an undamaged brushcutter.
► If the brushcutter is dirty: Clean the brush‐
cutter.
► Never attempt to modify your brushcutter.
Exception: Mounting one of the combina‐
tions of cutting attachment and deflector
recommended in this user manual.
►If the controls do not function properly: Do
not use your brushcutter.
► Fit genuine STIHL accessories for this
brushcutter.
► Mount the cutting attachment and deflector
as described in this user manual.
► Attach accessories as described in this
User Manual or in the User Manual for the
accessories.
►Never insert objects in the openings of the
brushcutter.
► Replace worn or damaged labels.
► If you have any doubts, be sure to consult a
STIHL dealer.
4.6.2 Deflector
The deflector is in a safe condition if the following
points are observed:
–The deflector is not damaged.
–If you are using the line limiting blade and
skirt: Line limiting blade and skirt are correctly
fitted.
WARNING
■If components do not comply with safety
requirements, they will no longer function
properly and safety devices may be rendered
inoperative. This can result in serious injuries.
► Work only with an undamaged deflector.
► If you are using the line limiting blade and
skirt: Work with a correctly fitted line limiting
blade and skirt.
►If you have any queries: Contact your
STIHL servicing dealer.
4.6.3 Mowing Head
The mowing head is in a safe condition if the fol‐
lowing points are observed:
–The mowing head is not damaged.
–The mowing head is not jammed.
–The mowing head is correctly installed and
firmly tightened.
–The mowing lines are properly installed.
–The wear limits are not exceeded.
WARNING
■ If they are in an unsafe condition, parts of the
mowing head or mowing lines may come off
and be ejected at high speed. People may be
seriously injured.
►Work only with an undamaged mowing
head.
► Never use metal objects in place of the
nylon mowing lines.
► Observe and remain inside the wear limits.
► If you are unsure: Consult a STIHL author‐
ized dealer.
4.6.4 Metal cutting attachment
The metal cutting attachment is in a safe condi‐
tion if the following points are observed:
–Metal cutting attachment and mounting hard‐
ware are undamaged.
–The metal cutting attachment is not warped.
–The metal cutting attachment is properly
installed and firmly tightened.
–The metal cutting attachment is correctly
sharpened.
–Cutting edges of the metal cutting attachment
have no burrs.
–The wear limits are not exceeded.
–If a metal cutting attachment not manufactured
by STIHL is used, it must not be heavier,
thicker, of a different shape, of a lower quality,
or larger in diameter than the largest metal
cutting attachment approved by STIHL.
WARNING
■If it is not in an safe condition, parts of the
metal cutting attachment may come off and be
thrown at high speed. People may be seri‐
ously injured.
4 Safety Precautions English
0458-029-0101-A 7

► Never work with a damaged metal cutting
attachment or damaged mounting hard‐
ware.
►Sharpen the metal cutting attachment cor‐
rectly.
► Deburr the cutting edges with a file.
► Have the metal cutting attachment bal‐
anced by a STIHL servicing dealer.
► Observe and remain inside the wear limits.
► Use a metal cutting attachment specified in
these instructions for use.
► If you are unsure: Consult a STIHL author‐
ized dealer.
4.6.5 Battery
The battery is in a safe condition if the following
points are observed:
–Battery is undamaged.
–The battery is clean and dry.
–Battery functions properly and has not been
modified.
WARNING
■ A battery that is not in a safe condition cannot
operate safely. Persons may be seriously
injured.
►Never work with a damaged battery.
► Never attempt to charge a damaged or
defective battery.
► If the battery is dirty: Clean the battery.
► If the battery is wet or damp: Allow the bat‐
tery to dry, 21.4.
► Never attempt to modify the battery.
► Never insert objects in the battery’s open‐
ings.
► Never bridge the battery's contacts with
metallic objects (short circuit).
► Do not open the battery.
► Replace worn or damaged labels.
■ Fluid may leak from a damaged battery. If that
liquid comes into contact with the skin or eyes,
the skin or eyes may be irritated.
►Avoid contact with the liquid.
► If skin contact occurs: Wash affected areas
of skin with plenty of water and soap.
► In the event of contact with eyes: Rinse
eyes with plenty of water for at least
15 minutes and consult a doctor.
■A damaged or defective battery may smell
unusual, emit smoke or burn. Persons may be
seriously or fatally injured, and property may
be damaged.
►If the battery smells unusual or emits
smoke: do not use the battery and keep it
away from combustible substances.
►If the battery catches fire: Attempt to extin‐
guish the battery with a fire extinguisher or
water.
4.7 Working
WARNING
■In certain situations, the user may no longer
be able to concentrate on their work. This may
result in the user stumbling, falling and suffer‐
ing serious injury.
►Work calmly and methodically.
► If light and visibility are poor: Do not use
your brushcutter.
► Operate the brushcutter alone.
► Keep the cutting attachment close to the
ground and horizontal to the surface.
► Watch out for obstacles.
► Work standing on the ground and keep your
balance.
► If you start feeling fatigue: Take a break.
■ The rotating cutting attachment can cut the
user. This may result in serious injury to the
user.
►Do not touch the rotating cutting attach‐
ment.
► If the cutting attachment is blocked by an
object: Switch off the brushcutter and
remove the battery. Only then remove the
object.
■If the behavior of the brushcutter changes dur‐
ing operation or feels unusual, it may no lon‐
ger be in a safe condition. This may result in
serious injury to people and damage to prop‐
erty.
►Stop working, remove the battery and con‐
sult a STIHL authorized dealer.
■ Vibrations may occur while using the brushcut‐
ter.
► Wear gloves.
► Take breaks.
► If signs of a circulatory disorder occur: Con‐
sult a doctor.
■ If the cutting attachment makes contact with a
foreign object during operation, the object or
parts of it may be ejected at high speed. Per‐
sons may be injured or property may be dam‐
aged.
►Remove foreign objects from the working
area.
■ If the rotating cutting attachment makes con‐
tact with a hard object, sparks may occur and
the cutting attachment may be damaged.
English 4 Safety Precautions
8 0458-029-0101-A

Sparks can cause fires in a flammable envi‐
ronment. Persons may be seriously or fatally
injured, and property may be damaged.
►Do not use in a flammable environment.
► Make sure the cutting attachment is in a
safe condition.
■ Note that the cutting attachment continues to
rotate for a short period after you release the
trigger. People may be seriously injured.
►Wait until the cutting attachment comes to a
complete stop.
■ In an emergency, the user may start to panic
and forget to take off the carrying system. This
may result in serious injury to the user.
►Practice taking off the carrying system.
4.8 Reactive forces
0000082390_003
Kickout can be caused for the following reasons:
–The shaded area or the black area of the rotat‐
ing metal cutting attachment comes into con‐
tact with a solid object and is suddenly braked.
–The rotating metal cutting attachment gets
pinched in the cut.
The risk of kickout is greatest in the black area.
WARNING
■These situations can abruptly decelerate or
stop rotation of the cutting attachment and
cause the cutting attachment to be thrown to
the right or in the direction of the user (black
arrow). The user can lose control of the trim‐
mer. There is a risk of serious or fatal injury.
►Hold the trimmer firmly with both hands.
► Work as described in this User Manual.
► Do not use the black area for cutting.
► Use a combination of cutting attachment,
deflector and carrying system recommen‐
ded in this User Manual.
►Sharpen the metal cutting attachment cor‐
rectly.
► Work with the engine running at full throttle.
4.9 Transporting
4.9.1 Brushcutter
WARNING
■The gear housing can get hot during opera‐
tion. There is a risk of burn injuries.
► Do not touch a hot gear housing.
■ The brushcutter may tilt over or shift during
transport. Persons may be injured or property
damaged.
► Remove the battery.
► If a metal cutting attachment is mounted: Fit
the transport guard.
► Secure the brushcutter with lashing straps,
belts or a net to prevent it turning over and
moving.
4.9.2 Battery
WARNING
■ The battery is not protected against all ambi‐
ent conditions. The battery may be damaged if
it is exposed to certain ambient conditions,
and damage to property may occur.
►Never transport a damaged battery.
■ The battery may turn over or shift during trans‐
port. This may result in injury to people and
damage to property.
►Pack the battery in packaging in such a way
that it cannot move.
► Secure the packaging so that it cannot
move.
4.10 Storing
4.10.1 Brushcutter
WARNING
■Children are not aware of and cannot assess
the dangers of a brushcutter and can be seri‐
ously injured.
► Remove the battery.
► If a metal cutting attachment is mounted: Fit
the transport guard.
► Store the brushcutter out of the reach of
children.
4 Safety Precautions English
0458-029-0101-A 9

■ Dampness can corrode the electrical contacts
on the brushcutter and metal components.
This can damage the brushcutter.
► Remove the battery.
► Store the brushcutter in a clean and dry
condition.
4.10.2 Battery
WARNING
■ Children are not aware of and cannot assess
the dangers of the battery Children may be
seriously injured.
►Store the battery out of the reach of chil‐
dren.
■ The battery is not protected against all ambi‐
ent conditions. If the battery is exposed to cer‐
tain ambient conditions, the battery may be
irreparably damaged.
►Store the battery in a clean and dry condi‐
tion.
► Store the battery in an enclosed space.
► Store the battery separately from the brush‐
cutter.
► If the battery is stored in the charger, dis‐
connect the mains plug and store the bat‐
tery at a state of charge between 40% and
60% (2 lit green LEDs).
►Do not store the battery outside of the
specified temperature limits, 21.3.
4.11 Cleaning, Maintenance and
Repair
WARNING
■The brushcutter may start up unintentionally if
the battery is left in place during cleaning,
maintenance or repair operations. This may
result in serious injury to people and damage
to property.
► Remove the battery.
■ The gear housing can get hot during opera‐
tion. There is a risk of burn injuries.
► Do not touch a hot gear housing.
■ Aggressive cleaning agents, a water jet or
pointed objects can damage the trimmer,
deflector, cutting attachment or battery. If the
brushcutter, deflector, cutting attachment or
battery are not cleaned correctly, components
may no longer function properly or safety devi‐
ces may be rendered inoperative. They may
cause serious injury to persons.
►Clean the brushcutter, deflector, cutting
attachment and battery as described in this
User Manual.
■If the brushcutter, deflector, cutting attachment
or battery are not serviced or repaired cor‐
rectly, components may no longer function
properly or safety devices may be rendered
inoperative. This may result in serous or fatal
injury to people.
►Do not attempt to service or repair the
brushcutter, deflector or battery yourself.
► If the brushcutter, the deflector or the bat‐
tery require servicing or repairs, contact
your STIHL dealer for assistance.
►Maintain the cutting attachment as descri‐
bed in the User Manual supplied with the
cutting attachment being used or on the
cutting attachment’s packaging.
■The user can be cut by the sharp cutting
edges while cleaning or maintaining cutting
attachments. This may result in injury to the
user.
► Wear work gloves made from resist‐
ant material.
5 Preparing Trimmer for
Operation
5.1 Preparing the Brushcutter for
Operation
The following steps must be performed before
commencing work:
► Ensure that the following components are in a
safe condition:
–Brushcutter, 4.6.1.
–Deflector, 4.6.2.
–Mowing head or metal cutting attachment,
4.6.3 or 4.6.4.
–Battery, 4.6.5.
►Check the battery, 12.2.
► Fully charge the battery as described in the
user manual for the STIHL AL 101, 301,
301-4, 500 chargers.
►Clean the brushcutter, 17.1.
►Mount the loop handle, 8.1.
► Select combination of cutting attachment,
deflector and carrying system, 22.1.
►Mount the deflector, 8.3.1.
English 5 Preparing Trimmer for Operation
10 0458-029-0101-A

► If a metal cutting attachment is used: mount
the barrier bar, 8.2.
► Mount the mowing head or metal cutting
attachment, 8.4.1 or 8.5.1.
►Put on and adjust the carrying system, 9.1.
►Adjust the loop handle, 9.2.
►Balance the brushcutter, 9.3.
►Check the controls, 12.1.
► If you cannot carry out this work: do not use
your brushcutter and contact your STIHL
authorized dealer for assistance.
5.2 Connecting a battery with Blue‐
tooth® radio interface with the
STIHL connected app
►Activate the Bluetooth® radio interface on the
mobile device.
►Activating the Bluetooth® radio interface on
the battery, 7.1.
► Download the STIHL connected app to the
mobile device from the App Store and create
an account.
► Open and sign in to the STIHL connected app.
► Add the battery in the STIHL connected app
and follow the instructions on the screen.
For contacts and other information, please visit
https://support.stihl.com or see the STIHL con‐
nected app.
The STIHL connected app is available interna‐
tionally.
6 Charging the Battery, LEDs
6.1 Charging the Battery
The charging time depends on various factors,
e.g. the battery temperature or the ambient tem‐
perature. For optimum performance, observe the
recommended temperature ranges, 21.4. The
actual charging time may vary from the charging
time indicated. The charging time is indicated at
www.stihl.com/charging-times.
► Recharge the battery as described in the User
Manual for the STIHL AL 101, 301, 301-4, 500
chargers.
6.2 Displaying the charge level
0000079877_002
20-40%
40-60%
60-80%
80-100%
0-20%
1
► Press the button (1).
The LEDs light up green for about 5 seconds
and indicate the state of charge.
► If the LED on the right flashes green: Charge
the battery.
6.3 LEDs on Battery
The LEDs can show the state of charge or mal‐
functions. The LEDs can glow or flash green or
red.
The state of charge is indicated when the LEDs
glow or flash green.
► If the LEDs glow or flash red: Troubleshooting,
20.1.
Malfunction in trimmer or battery.
7 Activating and Deactivating
Bluetooth® Radio Interface
7.1 Activating the Bluetooth® Radio
Interface
►If the battery has a Bluetooth® radio interface:
Press and hold the pushbutton until the
"BLUETOOTH®" LED next to the symbol
lights up blue for approximately 3 seconds.
The Bluetooth® radio interface on the battery
is activated.
7.2 Deactivating the Bluetooth®
Radio Interface
►If the battery has a Bluetooth® radio interface:
Press and hold the pushbutton until the
"BLUETOOTH®" LED next to the symbol
lights up blue six times.
The Bluetooth® radio interface on the battery
is deactivated.
8 Assembling the Trimmer
8.1 Attaching the loop handle
► Switch off the brushcutter and remove the bat‐
tery.
6 Charging the Battery, LEDs English
0458-029-0101-A 11

7
8
93
4
12
5
6
0000100842_001
► Insert the pin (8) into the opening in the quick
release clamp (5).
Align the pin (8) so that the notch of the pin is
at the bottom.
► Place the clamp (3) in the loop handle so that
the holes are aligned.
► Place the loop handle (2) with clamp (3) on the
shaft (9).
► Insert the long screw (7) through the holes in
the pin and quick release clamp (5).
► Press the clamp (4) against the shaft so that
the holes are aligned.
► Insert the short screw (6) through the holes.
► Insert the long screw (7) through the holes.
► Screw on the knurled nuts (1).
► Close the quick release clamp (5).
The loop handle (2) is properly adjusted if it can
no longer be moved.
► If the loop handle (2) can be moved:
► Open the quick release clamp (5).
► Tighten the knurled nuts (1).
► Close the quick release clamp (5).
The loop handle (2) can no longer be
moved.
► If the quick release clamp (5) cannot be
closed:
► Open the quick release clamp (5).
► Loosen the knurled nuts (1).
► Close the quick release clamp (5).
The loop handle (2) can no longer be
moved.
8.2 Attaching the barrier bar
► Switch off the brushcutter and remove the bat‐
tery.
4
3
1
2
0000100958_001
► Place the barrier bar (2) on the loop han‐
dle (3).
The barrier bar should close flush with the
loop handle.
► Screw in and securely tighten the screw (1).
8.3 Mounting and Removing the
Deflector
8.3.1 Attaching the deflector
► Switch off the brushcutter and remove the bat‐
tery.
2 2
3
1
4
0000100844_001
The line limiting blade (1) has already been
installed in the guard (2) and must not be
removed.
► Push the deflector (2) into the guides on the
gear housing up to the limit stop.
► Insert the screw (3) and tighten it securely.
8.3.2 Removing the Deflector
► Switch off the brushcutter and remove the bat‐
tery.
1
2
0000100957_001
► Unscrew the screw (2).
► Pull off the deflector (1).
8.4 Mounting and Removing the
Mowing Head
8.4.1 Mounting the Mowing Head
► Switch off the brushcutter and remove the bat‐
tery.
English 8 Assembling the Trimmer
12 0458-029-0101-A

2
3
4
0000-GXX-3031-A0
1
4
1
► Place the thrust plate (2) on the shaft (3) so
that its smaller diameter faces up.
► Fit the mowing head (1) on the shaft (3) and
turn it counterclockwise by hand.
► Insert the stop pin (4) in the bore up to the limit
stop and hold it depressed.
► Turn the mowing head (1) counterclockwise
until the stop pin (4) engages in position.
The shaft (3) is now blocked.
► Tighten down the mowing head (1) firmly by
hand.
► Remove the stop pin (4).
8.4.2 Removing the Mowing Head
► Switch off the brushcutter and remove the bat‐
tery.
► Insert the stop pin in the bore up to the limit
stop and hold it depressed.
► Rotate the mowing head until the stop pin
engages in position.
The shaft is now blocked.
► Unscrew the mowing head clockwise.
► Remove the thrust plate.
► Remove the stop pin.
8.5 Removing and Installing Metal
Cutting Attachment
8.5.1 Mounting the Metal Cutting Attach‐
ment
► Switch off the brushcutter and remove the bat‐
tery.
1
0000-GXX-3032-A1
2
3
4
5
6
7
► Place the thrust plate (5) on the shaft (6) so
that its smaller diameter faces up.
► Place the metal cutting attachment (4) on the
thrust plate (5). If you are fitting a circular saw
blade or a grass cutting blade with more than
4 cutting edges: Its cutting edges must face in
the same direction as the arrow on the deflec‐
tor.
► Place the thrust washer (3) on the metal cut‐
ting attachment (4) so that its raised side faces
up.
► Place the rider plate (2) on the thrust washer
(3) so that its closed side faces up.
► Insert the stop pin (7) in the bore up to the limit
stop and hold it depressed.
► Rotate the metal cutting attachment (4) coun‐
terclockwise until the stop pin (7) engages in
position.
The shaft (6) is now blocked.
► Fit the nut (1) counterclockwise and tighten it
down firmly.
► Remove the stop pin (7).
8.5.2 Removing the metal cutting attach‐
ment
► Switch off the brushcutter and remove the bat‐
tery.
► Insert the stop pin in the bore up to the limit
stop and hold it depressed.
► Rotate the metal cutting attachment clockwise
until the stop pin engages in position.
The shaft is now blocked.
► Unscrew the mounting nut clockwise.
► Remove the rider plate, thrust washer, metal
cutting attachment and thrust plate.
► Remove the stop pin.
8 Assembling the Trimmer English
0458-029-0101-A 13

9 Adjusting Trimmer for User
9.1 Fitting and Adjusting the Carry‐
ing System
1 3
22
0000-GXX-4594-A0
► Put on the shoulder strap (1) or full harness
(3).
► Adjust the shoulder strap (1) or full harness (3)
so that the carabiner (2) is about a hand’s
width below your right hip.
Other approved carrying systems are listed in
this User Manual, 22.
9.2 Aligning and adjusting the loop
handle
The loop handle can be adjusted to different
positions to suit the height and reach of the user.
► Switch off the brushcutter and remove the bat‐
tery.
a
1
3
2
0000100843_001
► Release the quick release clamp (2).
► Move the loop handle (1) to the required posi‐
tion and check that the following conditions
are met:
–The bump guard (3) fits between the loop
handle (1) and carrying ring.
–If you are using a mowing head: a = no
more than 30 cm
–If you are using a metal cutting attachment:
a = no more than 25 cm
► Close the quick release clamp (2) so that the
loop handle (1) can no longer be rotated on
the shaft.
9.3 Balancing the brushcutter
The battery and cutting attachment affect the bal‐
ance of the brushcutter. The brushcutter must be
balanced with the attached cutting attachment
and the battery that is used.
0000-GXX-3585-A0
The cutting attachment should rest lightly on the
ground.
► Switching off the brushcutter
12
0000101131_001
► Connect the carrying ring (2) to the carabi‐
ner (1).
► Wait for brushcutter to stop swinging.
► Check the position of the cutting attachment. If
it needs adjustment:
2
3
0000101130_001
► Loosen the screw (3).
► Move the carrying ring (2) up or down the
shaft until a correct balanced position is
reached.
► Tighten the screw (3) securely.
English 9 Adjusting Trimmer for User
14 0458-029-0101-A

10 Removing and Fitting the
Battery
10.1 Inserting the Battery
1
2
0000097033-001
► Insert the battery (1) up to the limit stop into
the battery compartment (2).
The battery (1) engages with a click and is
now locked.
10.2 Removing the Battery
► Set the brushcutter on a level surface.
2
1
0000097034-001
► Press both locking levers (1).
The battery (2) is released and can be
removed.
11 Switching the Trimmer
On/Off
11.1 Switching on the brushcutter
34
21
0000100846_001
► Hold the brushcutter firmly with your right hand
on the control handle so that your thumb
wraps around the grip (2) of the control han‐
dle.
► Hold the brushcutter with your left hand by the
loop handle so that your thumb wraps around
the loop handle.
► Depress the ergo lever (1) with your hand and
hold it there.
► Press the release slide (4) down with your
thumb.
► Press the trigger (3) with your index finger and
keep it depressed.
The brushcutter accelerates and the cutting
attachment rotates.
The more the trigger (3) is depressed, the faster
the rotation of the cutting attachment.
At the maximum power level, the brushcutter
identifies the cutting attachment used and auto‐
matically sets the maximum speed.
11.2 Switching off the brushcutter
► Release the trigger and the Ergo lever.
► Wait for the cutting attachment to stop rotat‐
ing.
► If the cutting attachment continues to rotate:
Remove the battery and contact your STIHL
dealer.
The brushcutter is defective.
12 Testing the Trimmer and
Battery
12.1 Checking the controls
Release slide, ergo lever and trigger
► Remove the battery.
► Try squeezing the trigger switch without acti‐
vating the release slide.
► If you can press the trigger: Stop using your
brushcutter and contact a STIHL authorized
dealer.
The release slide is faulty.
► Press and hold the release slide.
► Press and hold the ergo lever.
► Press the trigger.
The release slide can be released.
► Release the trigger and ergo lever.
► If the release slide, trigger or ergo lever is stiff
or does not spring back to the initial position:
Stop using the brushcutter and contact a
STIHL authorized dealer.
The release slide, trigger or ergo lever is
defective.
Switching on the brushcutter
► Insert the battery.
► Press and hold the release slide.
► Press and hold the trigger.
The cutting attachment rotates.
10 Removing and Fitting the Battery English
0458-029-0101-A 15

► If 3 LEDs flash red: Remove the battery and
consult a STIHL authorized dealer.
The brushcutter has a malfunction.
► Release the trigger.
The cutting attachment stops rotating after a
short period of time.
► If the cutting attachment continues to rotate:
Remove the battery and contact a STIHL
authorized dealer.
The brushcutter is defective.
12.2 Testing the Battery
► Press button on battery.
The LEDs glow or flash.
► If the LEDs do not glow or flash: Do not use
the battery and contact your STIHL servicing
dealer.
There is a malfunction in the battery.
13 Operating the Trimmer
13.1 Holding and guiding the brush‐
cutter
12
0000101131_001
► Connect the carrying ring (2) to the carabi‐
ner (1).
If you are using a mowing head:
0000-GXX-4604-A0
► Hold the brushcutter firmly with one hand on
the control handle so that your thumb wraps
around the grip of the control handle.
► Hold the brushcutter with your other hand on
the loop handle so that your thumb wraps
around the loop handle.
If you are using a metal cutting attachment:
0000-GXX-4605-A0
► Hold the brushcutter firmly with one hand on
the control handle so that your thumb wraps
around the grip of the control handle.
► Hold the brushcutter with your other hand on
the loop handle so that your thumb wraps
around the loop handle.
13.2 Setting the power level
Depending on the application, 2 power levels
can be set. The position of the power level slide
(1) shows the power level that has been set.
The selected power level affects the battery’s
runtime.
–
: ECO power level, low performance
–
Maximum power level, maximum per‐
formance.
When the maximum power level is set, the
brushcutter recognizes the cutting attachment
that has been attached and automatically adjusts
the appropriate speed of the blade.
When the Eco power level is selected, the speed
is reduced.
This can extend the battery runtime.
1
0000101114_001
► Use your thumb to slide the power level
slide (1) into the desired position.
English 13 Operating the Trimmer
16 0458-029-0101-A

13.3 Mowing
The cutting height is determined by the distance
of the cutting attachment from the ground.
A B
0000-GXX-4606-A1
Mowing with a mowing head (A)
► Swing the brushcutter steadily back and forth
in an arc.
► Walk forward slowly and steadily.
Mowing with a grass cutting blade (B)
► Mow with the left part of the metal cutting
attachment.
► Walk forward slowly and steadily.
For optimum performance, observe the recom‐
mended temperature ranges, 21.4.
13.4 Adjusting Nylon Line
13.4.1 Line Feed on AutoCut Mowing Heads
► Briefly tap the rotating mowing head on the
ground.
About 30 mm of fresh nylon line is advanced.
The line limiting blade in the deflector auto‐
matically cuts the mowing lines to the correct
length.
1
2
0000-GXX-4037-A1
Automatic feed will not take place if the mowing
lines are shorter than 25 mm.
► Switch off the brushcutter and remove the bat‐
tery.
► Depress the spool (1) on the mowing head
and hold it depressed.
► Pull out the mowing lines (2) by hand.
► If the mowing lines (2) cannot be pulled out to
the required length: Replace the spool (1) or
the mowing lines (2).
The spool is empty.
13.4.2 Line Feed on SuperCut Mowing
Heads
Mowing lines are advanced automatically. The
line limiting blade in the deflector automatically
cuts the mowing lines to the correct length.
Automatic feed will not take place if the mowing
lines are shorter than 40 mm.
► Switch off the brushcutter and remove the bat‐
tery.
► Pull out the mowing lines by hand.
► If the mowing lines cannot be pulled out to
required length: Replace the mowing lines.
The spool is empty.
14 After Finishing Work
14.1 After finishing work
► Switch off the brushcutter and remove the bat‐
tery.
► If the brushcutter is wet: Allow the brushcutter
to dry.
► If the battery is moist or wet: Allow the battery
to dry, 21.4.
► Clean the brushcutter.
► Clean the deflector.
► Clean the cutting attachment.
► Clean the battery.
► If a metal cutting attachment is attached:
Attach the appropriate transport guard.
15 Transporting
15.1 Transporting the brushcutter
► Switch off the brushcutter and remove the bat‐
tery.
► If a metal cutting attachment is mounted: Fit
the matching transport guard.
Carrying the brushcutter
► Carry the brushcutter in one hand properly
balanced by the shaft, with the cutting attach‐
ment behind you.
Transporting the brushcutter in the car
► Secure the brushcutter to prevent turnover
and movement.
15.2 Transporting the Battery
► Switch off the brushcutter and remove the bat‐
tery.
► Check that the battery is in a safe condition.
► Pack the battery in packaging in such a way
that it cannot move inside the packaging.
► Secure the packaging so that it cannot move.
The battery is subject to the Carriage of Danger‐
ous Goods regulations. The battery is classified
14 After Finishing Work English
0458-029-0101-A 17

as UN 3480 (lithium ion batteries) and has been
tested pursuant to UN Manual Tests and Criteria
Part III, Subsection 38.3.
The transport regulations can be found at
www.stihl.com/safety-data-sheets.
16 Storing
16.1 Storing the brushcutter
► Switch off the brushcutter and remove the bat‐
tery.
► If a metal cutting attachment is mounted:
Attach the appropriate transport guard.
► Ensure that the following conditions are met
when storing the brushcutter:
–The brushcutter cannot tip over or shift.
–The brushcutter is out of the reach of chil‐
dren.
–The brushcutter is clean and dry.
► If you store the brushcutter for more than 30
days: Remove the cutting attachment.
16.2 Storing the Battery
STIHL recommends keeping the battery in a
charging state between 40% and 60 % (2 green
LEDs lit).
► The battery should be stored in such a way
that the following conditions are fulfilled:
–The battery is out of the reach of children.
–The battery is clean and dry.
–The battery is in an enclosed space.
–The battery is separated from the brushcut‐
ter.
–If the battery is stored in the charger, dis‐
connect the mains plug and store the bat‐
tery at a state of charge between 40% and
60% (2 lit green LEDs).
–Do not store the battery outside of the
specified temperature limits, 21.3.
NOTICE
■ If the battery is not stored as described in this
User Manual, the battery may become deeply
discharged and irreparably damaged.
►Charge a discharged battery before storing
it. STIHL recommends keeping the battery
state of charge between 40% and 60% (2 lit
green LEDs).
►Store the battery separately from the brush‐
cutter.
17 Cleaning
17.1 Cleaning the Brushcutter
► Switch off the brushcutter and remove the bat‐
tery.
► Clean the brushcutter with a damp cloth.
► Clean vents with a paintbrush.
► Remove foreign objects from the battery com‐
partment and clean the battery compartment
with a damp cloth.
► Clean the electrical contacts in the battery
compartment with a paintbrush or soft brush.
17.2 Cleaning the Deflector and Cut‐
ting Attachment
► Switch off the trimmer and remove the battery.
► Clean the deflector and cutting attachment
with a damp cloth or a soft brush.
17.3 Cleaning the Battery
► Clean the battery with a damp cloth.
18 Maintenance
18.1 Maintenance Intervals
The maintenance intervals are dependent on the
environmental and operating conditions. STIHL
recommends the following maintenance inter‐
vals:
Every 12 months
► Have the trimmer checked by a STIHL servic‐
ing dealer.
18.2 Sharpening and Balancing a
Metal Cutting Attachment
Correctly sharpening and balancing metal cutting
attachments requires a lot of practice.
STIHL recommends you have metal cutting
attachments resharpened and balanced by a
STIHL servicing dealer.
► Sharpen the metal cutting attachment as
described in the instructions and on the pack‐
aging supplied with the cutting attachment you
are using.
19 Repairing
19.1 Repairing the Trimmer and
Cutting Attachment
The trimmer and cutting attachment cannot be
repaired by the user.
English 16 Storing
18 0458-029-0101-A

► If the trimmer or cutting attachment is dam‐
aged: Do not use your trimmer or cutting
attachment and contact your STIHL servicing
dealer.
19.2 Servicing and Repairing the
Battery
The battery requires no servicing and cannot be
repaired.
► If the battery has a malfunction or is damaged:
Replace the battery.
20 Troubleshooting
20.1 Troubleshooting the brushcutter or battery
Fault LEDs on the
battery
Cause Remedy
The brushcutter
does not start
when switched
on.
1 LED flashes
green.
The state of charge of
the battery is too low.
► Recharge the battery fully as described in
the User Manual for the STIHL AL 101,
301, 301-4, 500 chargers.
1 LED lights
up red.
The battery is too
warm or too cold.
► Remove the battery.
► Allow the battery to cool down or warm
up.
3 LEDs flash
red.
The brushcutter has a
malfunction.
► Remove the battery.
► Clean the electrical contacts in the bat‐
tery compartment.
► Insert battery.
► Switch on the brushcutter.
► If 3 LEDs continue to flash red: Do not
use your brushcutter; contact a STIHL
authorized dealer for assistance.
3 LEDs light
up red.
The brushcutter is too
hot.
► Remove the battery.
► Allow the brushcutter to cool down.
4 LEDs flash
red.
There is a fault in the
battery.
► Remove the battery and reinsert it.
► Switch on the brushcutter.
► If 4 LEDs continue to flash red: Do not
use the battery; contact a STIHL author‐
ized dealer.
No electrical contact
between brushcutter
and battery.
► Remove the battery.
► Clean electrical contacts in the battery
compartment.
► Insert battery.
The brushcutter or
battery is damp.
►Allow the brushcutter or battery to dry,
21.4.
Trigger is pressed
before activating the
release slide.
► Switch on the brushcutter as described in
this User Manual.
The brushcutter
cuts out during
operation.
3 LEDs light
up red.
The brushcutter is too
hot.
► Remove the battery.
► Allow the brushcutter to cool down.
There is an electrical
fault.
► Remove the battery and reinsert it.
► Switch on the brushcutter.
The runtime of
the brushcutter is
too short.
The battery is not fully
charged.
► Recharge the battery fully as described in
the User Manual for the STIHL AL 101,
301, 301-4, 500 chargers.
The battery service
life has been excee‐
ded.
► Replace battery.
20 Troubleshooting English
0458-029-0101-A 19

Fault LEDs on the
battery
Cause Remedy
The power levels
cannot be set.
The trigger is pressed
and the brushcutter is
switched on.
► Select the power level as described in
this User Manual.
The mowing
head cannot be
removed by
hand.
The mowing head is
overtightened.
► Block the fanwheel with the stop pin.
► Unscrew the mowing head by hand.
► Remove the stop pin.
STIHL connected
app is unable to
find the battery
with .
Bluetooth® interface
on the battery or
mobile device is deac‐
tivated.
►Activate Bluetooth® interface on the bat‐
tery or mobile device.
The distance between
the battery and mobile
device is too great.
►Reduce the distance, 21.1.
► If the battery still cannot be found with
the STIHL connected app: Contact a
STIHL authorized dealer for assistance.
20.2 Product Support and Assis‐
tance on Use
Product support and assistance on use are avail‐
able from STIHL servicing dealers.
For contacts and other information, please visit
https://support.stihl.com or www.stihl.com.
21 Specifications
21.1 STIHL FSA 120.0 R Brushcut‐
ters
–Permitted batteries:
–STIHL AP
–STIHL AR
–Weight without battery, cutting attachment and
deflector: 4.3 kg
–Length without cutting attachment: 1788 mm
–Degree of protection: IPX4 (protection against
splash water from any direction)
For runtime, see www.stihl.com/battery-life.
21.2 STIHL AP battery
–Battery technology: lithium-ion
–Voltage: 36 V
–Capacity in Ah: see rating label
–Energy content in Wh: see rating label
–Weight in kg: see rating label
–Bluetooth® radio interface (only for batteries
with ):
–Data connection: Bluetooth® 5.1. The
mobile appliance must be compatible with
Bluetooth® Low Energy 5.0 and support
Generic Access Profile (GAP).
–Frequency band: ISM band 2.4 GHz
–Maximum RF power transmitted: 1 mW
–Signal range: approx. 10 m. The signal
strength depends on the ambient conditions
and the mobile terminal. Signal range can
vary greatly depending on local conditions,
including the receiver. The range may be
perceptibly reduced inside enclosed rooms
and through metal barriers (such as walls,
shelves or cases).
–Mobile appliance operating system require‐
ments: Android or iOS (current version or
higher)
21.3 Temperature limits
WARNING
■ The battery is not protected against all ambi‐
ent conditions. If the battery is exposed to cer‐
tain environmental conditions, it may catch fire
or explode. This may result in serious injury to
people and damage to property.
►Do not charge the battery below -20°C or
above 50°C.
► Do not use the brushcutter or battery below
-20°C or above 50°C.
► Do not store the brushcutter or battery
below -20°C or above 70°C.
21.4 Recommended temperature
ranges
For optimum performance of the brushcutter and
battery, note the following temperature ranges:
–Charging: 5°C to 40°C
–Use: - 10 °C to + 40 °C
–Storage: - 20 °C to + 50 °C
If the battery is charged, used or stored outside
the recommended temperature ranges, perform‐
ance may be restricted.
English 21 Specifications
20 0458-029-0101-A