Husqvarna 124C User manual

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SYMBOL EXPLANATION
Only intended for trimmer heads.
Noise emission to the
environment according to the
European Community’s
Directive. The machine’s
emission is specified in the
Technical data section and
on label.
Sound pressure level at
7,5 metres
Use unleaded or quality leaded
gasoline and two--stroke oil
mixed at a ratio of 2% (1:50).
Other symbols/decals on the machine
refer to special certification requirements
for certain markets.
Stop the engine by pushing
and holding the stop switch
in the STOP position. CAUTION!
The stop switch automatically
returns to the start position.
In order to prevent unintentional
starting, the spark plug cap must be
removed from the spark plug when
assembling, checking and/or
performing maintenance.
Regular cleaning is required.
Visual check.
Approved eye protection must
always be used.
Symbols
WARNING: Clearing saws, brush-
cutters and trimmers can be dan-
gerous! Careless or incorrect use
can result in serious or fatal
injury to the operator or others.
Please read the operator’s manual
carefully and make sure you
understand the instructions
before using the machine.
Always wear:
SA protective helmet where there
is a risk of falling objects
SHearing protection
SApproved eye protection
Max. speed of output shaft, rpm
Beware of thrown objects and
ricochets.
The operator of the machine
shall ensure, while working,
that no persons or animals
come closer than 15 metres.
Arrows which show limits for
handle mounting.
Always wear approved protective
gloves.
Use anti--slip and stable boots.
Only use non--metallic, flexible
cutting attachments, i.e. trimmer
heads with trimmer line.
This product is in accordance with
applicable EC directives.

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115345726 Rev. 1 1/25/10
CONTENTS
Contents
KEY TO SYMBOLS
Symbols 2.........................
CONTENTS
Contents 3........................
Note the following before starting 3....
WHAT IS WHAT?
What is what? 4...................
GENERAL SAFETY PRECAUTIONS
Important 5........................
Personal protective equipment 5......
Machine’s safety equipment 6........
Cutting equipment 7.................
ASSEMBLY
Fitting the loop handle 9.............
Fitting the trimmer guard and
trimmer head 9.....................
FUEL HANDLING
Fuel safety 10.......................
Fuel 10............................
Fuelling 11.........................
STARTING AND STOPPING
Check before starting 12..............
Starting and stopping 12..............
WORKING TECHNIQUES
General working instructions 14........
MAINTENANCE
Carburetor 16.......................
Muffler 16..........................
Spark plug 17.......................
Air filter 17..........................
Maintenance schedule 18.............
TECHNICAL DATA
Technical data 19....................
EC--declaration of conformity
(Applies to Europe only) 20............
Note the following before
starting:
Husqvarna AB has a policy of continuous
product development and therefore
reserves the right to modify the design and
appearance of products without prior
notice. Long--term exposure to noise can
result in permanent hearing impairment.
Always use approved hearing protection.
WARNING: A clearing saw,
brushcutter or trimmer can be
dangerous if used incorrectly or
carelessly, and can cause serious
or fatal injury to the operator or
others. It is extremely important
that you read and understand the
contents of this operator’s manual.
WARNING: Under no circum-
stances may the design of the
machine be modified without the
permission of the manufacturer.
Always use genuine accessories.
Non--authorized modifications
and/or accessories can result
in serious personal injury or the
death of the operator or others.

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WHAT IS WHAT?
1. Trimmer head 9. Fuel tank
2. Cutting attachment guard 10. Choke control
3. Shaft 11. Primer bulb
4. Loop handle 12. Air filter cover
5. Throttle control 13. Handle adjustment
6. Stop switch 14. Wrench
7. Cylinder cover 15. Operator’s manual
8. Starter handle
What is what?
3
7
4
1
212
168
11
10
5
9
15
13
14

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GENERAL SAFETY PRECAUTIONS
IMPORTANT! Whenever you use a clear-
ing saw, brushcutter or trimmer you must
wear personal protective equipment that is
approved by the authorities. Personal
protective equipment does not eliminate
the risk of accidents, but it can reduce the
effects of an injury in the event of an acci-
dent. Ask your dealer for help when
choosing protective equipment.
HEARING PROTECTION
Wear hearing protection that provides
adequate noise reduction.
EYE PROTECTION
Always wear approved eye protection. If
you use a visor then you must also wear
approved protective goggles. Approved
protective goggles must comply with EN
166 in EU countries.
GLOVES
Gloves should be worn when necessary,
e.g., when fitting cutting attachments.
BOOTS
Wear anti--slip and stable boots.
Personal protective equipment
WARNING: Listen out for warn-
ing signals or shouts when you are
wearing hearing protection. Always
remove your hearing protection as
soon as the engine stops.
Important
IMPORTANT! The machine is only designed
for trimming grass.
The only accessories you can operate with
this engine unit are the cutting attachments
we recommend in the chapter on Technical
data.
Never use the machine if you are tired, if you
have drunk alcohol, or if you are taking medi-
cation that could affect your vision, your
judgement or your co--ordination.
Wear personal protective equipment. See in-
structions under the heading Personal
protective equipment.
Never use a machine that has been modified
in any way from its original specification.
Never use a machine that is faulty. Carry out
the checks, maintenance and service instruc-
tions described in this manual. Some mainte-
nance and service measures must be carried
out by trained and qualified specialists. See
instructions under the heading Maintenance.
All covers and guards must be fitted before
starting. Make sure the spark plug cap and
lead are not damaged. Otherwise you could
get an electric shock.
The machine operator must ensure that no
people or animals come closer than 15
metres while working. When several opera-
tors are working in the same area, the safety
distance should be at least 15 metres.
WARNING: Never allow children
to use or be in the vicinity of the
machine. As the machine is equipped
with a spring--loaded stop switch and
can be started by low speed and
force on the starter handle, even
small children under some circum-
stances can produce the force neces-
sary to start the machine. This can
mean a risk of serious personal inju-
ry. Therefore remove the spark plug
cap when the machine is not under
close supervision.
WARNING: This machine pro-
duces an electromagnetic field
during operation. Under some cir-
cumstances, this field may interfere
with active or passive medical
implants. To reduce the risk of
serious or fatal injury, we recom-
mend persons with medical
implants to consult their physician
and the medical implant manufac-
turer before operating this machine.

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GENERAL SAFETY PRECAUTIONS
IMPORTANT! All servicing and repair work
on the machine requires special training. This
is especially true of the machine’s safety
equipment. If your machine fails any of the
checks described below you must contact
your service agent. When you buy any of our
products we guarantee the availability of pro-
fessional repairs and service. If the retailer
who sells your machine is not a servicing
dealer, ask him for the address of your near-
est service agent.
Machine’s safety equipment
This section describes the machine’s safe-
ty equipment, its purpose, and how checks
and maintenance should be carried out to
ensure that it operates correctly. See the
“What is what” section to locate where this
equipment is positioned on your machine.
The life span of the machine can be re-
duced and the risk of accidents can in-
crease if machine maintenance is not car-
ried out correctly and if service and/or re-
pairs are not carried out professionally. If
you need further information please contact
your nearest service workshop.
WARNING: Never use a machine
that has faulty safety equipment!
Follow the control, maintenance
and service instructions described
in this section. If your machine fails
any of these checks contact your
service agent to get it repaired.
FIRST AID KIT
A first aid kit should be carried by opera-
tors of clearing saws, brushcutters or trim-
mers.
CLOTHING
Wear clothes made of a strong fabric and
avoid loose clothing that can catch on
shrubs and branches. Always wear heavy,
long pants. Do not wear jewelry, shorts
sandals or go barefoot. Secure hair so it is
above shoulder level.
Stop switch
Make sure the engine stops when you push
and hold the stop switch.
Cutting attachment guard
This guard is intended to prevent loose
objects from being thrown towards the
operator. The guard also protects the
operator from accidental contact with the
cutting attachment.
Check that the guard is undamaged and not
cracked. Replace the guard if it has been
exposed to impact or is cracked.
Always use the recommended guard for the
cutting attachment you are using. See the
“Technical data” section.
Use of incorrectly wound trimmer line or an
incorrect cutting attachment increases the
level of vibration.
WARNING: Overexposure to
vibration can lead to circulatory
damage or nerve damage in people
who have impaired circulation.
Contact your doctor if you experi-
ence symptoms of overexposure to
vibration. Such symptoms include
numbness, loss of feeling, tingling,
pricking, pain, loss of strength,
changes in skin color or condition.
These symptoms normally appear
in the fingers, hands or wrists. The
risk increases at low temperatures.
WARNING: Never use a cutting
attachment without an approved
guard. See the section on “Technical
data”. If an incorrect or faulty guard
is fitted this can cause serious
personal injury.

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GENERAL SAFETY PRECAUTIONS
In countries that have a warm and dry
climate there is a significant risk of fire.
We therefore fit certain mufflers with a spark
arrestor mesh. Check whether the muffler
on your machine is fitted with this kind of
mesh.
For mufflers, it is very important that you
follow the instructions on checking, main-
taining, and servicing your machine.
Never use a machine that has a faulty
muffler.
Regularly check that the muffler is securely
attached to the machine.
Muffler
The muffler is designed to reduce the noise
level and to direct the exhaust gases away
from the operator.
CAUTION! Muffler is fitted with a catalytic
convertic designed to reduce harmful ex-
haust gases.
Muffler bolts
WARNING: Mufflers fitted with
catalytic converters get very hot
during use and remain so for some
time after stopping. This also applies
at idle speed. Contact can result in
burns to the skin. Remember the risk
of fire!
Cutting equipment
This section describes how to choose and
maintain your cutting equipment in order to:
SObtain maximum cutting performance.
SExtend the life of cutting equipment.
WARNING: A faulty cutting at-
tachment may increase the risk of
accidents.
IMPORTANT!
Only use cutting attachments with the guards
we recommend! See the section on
“Technical data”.
Refer to the instructions for the cutting attach-
ment to check the correct way to load the
trimmer line and the correct line diameter.
WARNING: Always stop the en-
gine before doing any work on the
cutting attachment. This continues
to rotate even after the throttle has
been released. Ensure that the
cutting attachment has stopped
completely and disconnect the
lead from the spark plug before
you start to work on it.
W
A
RNING: Theinsideofthe
muffler contain chemicals that may
be carcinogenic. Avoid contact with
these elements in the event of a
damaged muffler.
WARNING: Bear in mind that:
Engine exhaust fumes contain car-
bon monoxide, which can cause
carbon monoxide poisoning. For
this reason you should not start or
run the machine indoors, or any-
where that is poorly ventilated.
The exhaust fumes from the engine
are hot and may contain sparks
which can start a fire. Never start
the machine indoors or near com-
bustible material!

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GENERAL SAFETY PRECAUTIONS
Trimmer head
SOnly use the recommended cutting at-
tachments. See the section on “Technical
data”.
IMPORTANT!
Always ensure the trimmer line is wound
tightly and evenly around the drum, other-
wise the machine will generate harmful
vibration.
SSmaller machines generally require small
trimmer heads and vice versa. This is be-
cause when clearing using trimmer line
the engine must throw out the trimmer
line radially from the trimmer head and
overcome the resistance of the grass
being cleared.
SThe length of the trimmer line is also im-
portant. A longer trimmer line requires
greater engine power than a shorter
trimmer line of the same diameter.
SMake sure that the cutter on the trimmer
guard is intact. This is used to cut the
trimmer line to the correct length.
STo increase the life of the trimmer line it
can be soaked in water for a couple of
days. This will make the line tougher so
that it lasts longer.

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ASSEMBLY
N
O
TE: Make sure unit is assembled cor-
rectly as shown in this manual.
Fitting the loop handle
SPosition the handle on the shaft. Note
that the handle must be mounted be-
tween the two arrows on the shaft.
SFit the screw, securing plate and wing
nut as shown in the diagram.
STighten the wing nut.
Fitting the trimmer guard and
trimmer head
SFit the correct trimmer guard (A) for use
with the trimmer head. Hook the trimmer
guard/combination guard onto the fitting on
the shaft and secure with the nut (B).
A
C
B
SFit the dust cup (C) on the shaft. The nut
must be completely covered by the dust
cup.
SHold the dust cup with a wrench to pre-
vent the shaft from rotating.
SScrew the trimmer head (D) onto the
shaft.
STo dismantle, follow the instructions in
the reverse order.
D

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FUEL HANDLING
Fuel safety
Never start the machine:
1. If you have spilled fuel on it. Wipe off the
spillage and allow remaining fuel to evapo-
rate.
2. If you have spilled fuel on yourself or your
clothes, change your clothes. Wash any
part of your body that has come in contact
with fuel. Use soap and water.
3. If the machine is leaking fuel. Check regu-
larly for leaks from the fuel cap and fuel
lines.
Transport and storage
SStore and transport the machine and fuel
so that there is no risk of any leakage or
fumes coming into contact with sparks or
naked flames, for example, from electri-
cal machinery, electric motors, electrical
relays/switches or boilers.
SWhen storing and transporting fuel al-
ways use approved containers intended
for this purpose.
SWhen storing the machine for long peri-
ods the fuel tank must be emptied. Con-
tact your local petrol station to find out
where to dispose of excess fuel.
SEnsure the machine is cleaned and that
a complete service is carried out before
long--term storage.
SIn order to prevent unintentional starting
of the engine, the spark plug cap must
always be removed during long--term
storage, if the machine is not under
close supervision and when performing
all service measures.
SSecure the machine during transport.
Fuel
CAUTION! The machine is equipped with a
two--stroke engine and must always be run
using a mixture of petrol and two-stroke
engine oil. It is important to accurately mea-
sure the amount of oil to be mixed to ensure
that the correct mixture is obtained. When
mixing small amounts of fuel, even small
inaccuracies can drastically affect the ratio
of the mixture.
Petrol
CAUTION! Always use a good quality pet-
rol/oil mixture (at least 90 octane).
Use low--emission petrol, also known as
alkylate petrol, if it is available.
SThe lowest octane recommended is 90.
If you run the engine on a lower octane
than 90, it can result in knocking. This
gives rise to a high engine temperature,
which can result in serious engine damage.
SWhen working at continuous high revs, a
higher octane rating is recommended.
Two--stroke oil
SFor best results and performance, use
HUSQVARNA two--stroke oil, which is
specially formulated for our two--stroke
engines. Mixture 1:50 (2%).
SIf HUSQVARNA two--stroke oil is not avail-
able, you may use another two-stroke oil of
good quality that is intended for air cooled
engines. Contact your dealer when select-
ing an oil. Mixing ratio 1:33 (3%).
SNever use two--stroke oil intended for
water--cooled outboard engines,
sometimes referred to as outboard oil.
SNever use oil intended for four--stroke
engines.
WARNING: Take care when han-
dling fuel. Bear in mind the risk of
fire, explosion and inhaling fumes.
50,100,15
10 0,20 0,30
15 0,30 0,45
20 0,40 0,60
Petrol,
litre Two--stroke oil, litre
2% (1:50) 3% (1:33)
WARNING: Fuel and fuel fumes
are highly inflammable and can
cause serious injury when inhaled
or allowed to come in contact with
the skin. For this reason observe
caution when handling fuel and
make sure there is adequate ven-
tilation.

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FUEL HANDLING
SAlways start by flling half the amount of the
petrol to be used. Then add the entire
amount of oil. Mix (shake) the fuel mixture.
Add the remaining amount of petrol.
SMix (shake) the fuel mixture thoroughly
before filling the machine’s fuel tank.
SDo not mix more than one month’s sup-
ply of fuel at a time.
SIf the machine is not used for some time,
the fuel tank should be emptied and
cleaned.
WARNING: The catalytic con-
verter muffler gets very hot during
and after use. This also applies
during idling. Be aware of the fire
hazard, especially when working
near flammable substances and/or
vapors.
Fueling
WARNING: Taking the following
precautions, will lessen the risk of
fire:
Do not smoke or place hot objects
near fuel.
Always shut off the engine before
refueling.
Always stop the engine and let it
cool for a few minutes before refu-
elling.
When refueling, open the fuel cap
slowly so that any excess pressure
is released gently.
Tighten the fuel cap carefully after
refueling.
Always move the machine away
from the refueling area before
starting.
Min. 3 m
M
i
x
i
ng
SAlways mix the petrol and oil in a clean
container intended for fuel.
SClean the area around the fuel cap.
Contamination in the tank can cause
operating problems.
SEnsure that the fuel is well mixed by shak-
ing the container before filling the tank.

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STARTING AND STOPPING
Check before starting
SNever start the machine indoors. Exhaust
fumes can be dangerous if inhaled.
SObserve your surroundings and make
sure that there is no risk of people or
animals coming into contact with the
cutting equipment.
SPlace the machine on the ground,
ensure the cutting attachment is clear of
twigs and stones. Hold the body of the
machine on the ground using your left
hand (CAUTION! Not with your foot).
Then grip the starter handle with your
right hand and pull the starter cord.
SCheck that the trimmer head and trimmer
guard are not damaged or cracked.
Replace the trimmer head or trimmer
guard if they have been exposed to
impact or are cracked.
SNever use the machine without a guard
nor with a defective guard.
Cold engine
Primer bulb: Press the primer bulb 10
times until fuel begins to fill the bulb. The
primer bulb need not be completely filled.
Choke: Move the blue engine choke lever
over to the closed position.
Starting
Hold the body of the machine on the
ground using your left hand (CAUTION!
Not with your foot!).
Firmly grip the starter rope handle with
your right hand. DO NOT squeeze
throttle trigger. Slowly pull out the cord
until you feel some resistance (the starter
pawls grip); then quickly and powerfully
pull the cord.
Never wrap the starter cord around
your hand.
Repeat pulling the cord until the engine
attempts to start. Move the blue engine
choke lever to the ½position. Pull starter
rope until engine runs. Move the blue en-
gine choke lever to the opened position.
WARNING: When the engine is
started with the choke in either the
choke or start throttle positions the
cutting attachment will start to rotate
immediately.
WARNING: The complete clutch,
clutch cover, and shaft must be
fitted before the machine is started,
otherwise parts could come loose
and cause personal injury.
Always move the machine away
from the refueling area before
starting. Place the machine on a
flat surface. Ensure the cutting at-
tachment cannot come into contact
with any object.
Make sure no unauthorized
persons are in the working area,
otherwise there is a risk of serious
personal injury. The safety
distance is 15 meters.
Starting and stopping

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STARTING AND STOPPING
Stopping
Stop the engine by pushing and holding
the stop switch in the STOP position until
the engine stops.
CAUTION! The stop switch automatically
returns to the start position. In order to pre-
vent unintentional starting, the spark plug
cap must be removed from the spark plug
when assembling, checking and/or per-
forming maintenance.
Warm engine
With a warm engine, move the blue engine
choke lever to the ½position. Pull starter
rope until engine runs. Move the blue en-
gine choke lever to the opened position.
CAUTION!
Do not put any part of your body in marked
area. Contact can result in burns to the
skin, or electrical shock if the spark plug
cap has been damaged. Always use
gloves. Do not use a machine with dam-
aged spark plug cap.
CAUTION! Do not pull the starter cord all
the way out and do not let go of the starter
handle when the cord is fully extended.
This can damage the machine.
NOTE: If engine dies, return blue engine
choke lever to the closed position and
repeat starting steps.
WARNING: Whentheengineis
started with the choke in the closed
position the cutting attachment will
start to rotate immediately.

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WORKING TECHNIQUES
General working instructions
IMPORTANT!
This section describes the basic safety pre-
cautions for working with trimmers. If you
encounter a situation where you are uncer-
tain how to proceed you should ask an ex-
pert. Contact your servicing dealer.
Avoid all usage which you consider to be
beyond your capability.
You must understand the difference between
forestry clearing, grass clearing and grass
trimming before use.
Basic safety rules
1. Look around you:
STo ensure that people, animals or other
things cannot affect your control of the
machine.
STo ensure that people, animals, etc.,
do not come into contact with the cut-
ting attachment or loose objects that
are thrown out by the cutting attach-
ment.
SCAUTION! Do not use the machine
unless you are able to call for help in
the event of an accident.
2. Do not use the machine in bad weather,
such as dense fog, heavy rain, strong
wind, intense cold, etc. Working in bad
weather is tiring and often brings added
risks, such as icy ground, unpredictable
felling direction, etc.
3. Make sure you can move and stand safely.
Check the area around you for possible ob-
stacles (roots, rocks, branches, ditches, etc.)
in case you have to move suddenly. Take
great care when working on sloping ground.
4. Switch off the engine before moving to
another area.
5. Never put the machine down with the engine
running or while the cutting attachment is
rotating.
Basic working techniques
SAlways slow the engine to idle speed after
each working operation. Long periods at
full throttle without any load on the engine
can lead to serious engine damage.
Grass trimming with a trimmer head
Trimming
SHold the trimmer head just above the ground
at an angle. It is the end of the trimmer line
that does the work. Let the trimmer line work
at its own pace. Never press the trimmer
lineintotheareatobecut.
SThe trimmer line can easily remove grass
and weeds up against walls, fences, trees
and borders, however it can also damage
sensitive bark on trees and bushes, and
damage fence posts.
WARNING: Sometimes branches
or grass get caught between the
guard and cutting attachment.
Always stop the engine before
cleaning.
WARNING: Neither the operator
of the machine nor anyone else
may attempt to remove the cut ma-
terial while the engine is running or
the cutting equipment is rotating,
as this can result in serious injury.
Stop the engine and cutting equip-
ment before you remove material
that has wound around the blade
shaft as otherwise there is a risk of
injury. The bevel gear can get hot
during use and may remain so for a
while afterwards. You could get
burned if you touch it.
WARNING: Watch out for
thrown objects. Always wear ap-
proved eye protection. Never lean
over the cutting attachment guard.
Stones, rubbish, etc. can be thrown
up into the eyes causing blindness
or serious injury. Keep unautho-
rised persons at a distance. Chil-
dren, animals, onlookers and help-
ers should be kept outside the
safety zone of 15 m. Stop the ma-
chine immediately if anyone ap-
proaches. Never swing the ma-
chine around without first checking
behind you to make sure noone is
within the safety zone.

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WORKING TECHNIQUES
SReduce the risk o
f
damaging plants by
shorteningthetrimmerlineto4--41/2inches
(10--12 cm) and reducing the engine speed.
SWhen trimming you should use less than
full throttle so that the trimmer line lasts
longer and to reduce the wear on the
trimmer head.
Clearing
SThe clearing technique removes all un-
wanted vegetation. Keep the trimmer
head just above the ground and tilt it. Let
the end of the trimmer line strike the
ground around trees, posts, statues and
the like. CAUTION! This technique
increases the wear on the trimmer line.
SThe trimmer line wears quicker and must
be fed forward more often when working
against stones, brick, concrete, metal
fences, etc., than when coming into con-
tact with trees and wooden fences.
Cutting
SThe trimmer is ideal for cutting grass that
is difficult to reach using a normal lawn
mower. Keep the trimmer line parallel to
the ground when cutting. Avoid pressing
the trimmer head against the ground as
this can ruin the lawn and damage the
tool.
SDo not allow the trimmer head to con--
stantly come into contact with the ground
during normal cutting. Constant contact
of this type can cause damage and wear
to the trimmer head.
Sweeping
SThe fan effect of the rotating line can be
used for quick and easy clearing up.
Hold the trimmer line parallel to and
above the area to be swept and move
the tool to and fro.
SWhen cutting and sweeping you should
use full throttle to obtain the best results.
WARNING: Neither the operator
of the machine nor anyone else may
attempt to remove the cut material
while the engine is running or the
trimmer line is rotating, as this can
result in serious injury. Stop the
engine and trimmer head before you
remove material that has wound
around the drive shaft as otherwise
there is a risk of injury. The bevel
gear can get hot during use and may
remain so for a while afterwards. You
could get burned if you touch it.
WARNING: Watch out for thrown
objects. Always wear eye protection.
Never lean over the cutting attach-
ment guard. Stones, rubbish, etc.
can be thrown up into the eyes
causing blindness or serious injury.
Keep unauthorized persons at a dis-
tance. Children, animals, onlookers
and helpers should be kept outside
thesafetyzoneof15m.
Stop the machine immediately if
anyone approaches.

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MAINTENANCE
Carburetor
Your Husqvarna product has been designed
and manufactured to specifications that re-
duce harmful emissions. After the engine
has used 8--10 tanks of fuel, the engine will
be run--in. To ensure that it continues to run
at peak performance and to minimize harm-
ful exhaust emissions after the run--in peri-
od, ask your servicing dealer to adjust your
carburetor.
The owner is responsible
f
or the per
f
or-
mance of all required maintenance as
defined in the operator’s manual.
WARNING: The complete clutch,
clutch cover, and shaft must be
fitted before the machine is started,
otherwise parts could come loose
and cause personal injury.
Function
SThe carburetor governs the engine’s
speed via the throttle control. Air and fuel
are mixed in the carburetor.
SThe T--screw regulates the throttle setting
at idle speed. If the T--screw is turned
clockwise this gives a higher idle speed;
turning it counterclockwise gives a lower
idle speed.
Basic setting
SThe basic carburetor settings are ad-
justed during testing at the factory. Fine
adjustment should be carried out by a
skilled technician.
Rec. idle speed:
See “Technical data” section.
Recommended max. speed:
See “Technical data” section.
Fine adjustment of the idle speed--T
Adjust the idle speed using the idle adjust-
ment screw--T if it is necessary to readjust.
First, turn the idle adjustment screw--T
clockwise until the cutting attachment starts
to rotate. Then, turn the screw counter-
clockwise until the cutting attachment stops.
The idle speed is correctly adjusted when
the engine will run smoothly in every posi-
tion. The idle speed should also be well
below the speed at which the cutting attach-
ment starts to rotate.
CAUTION! If the cutting attachment rotates
when the engine is idling the idle adjustment
screw T should be turned counterclockwise
until the cutting attachment stops.
Idle Speed
Screw--T
WARNING: If the idle speed can-
not be adjusted so that the cutting
attachment stops, contact your ser-
vicing dealer. Do not use the ma-
chine until it has been correctly ad-
justed or repaired.
Unit/Maintenance Safety
Disconnect the spark plug before perform-
ing maintenance, except carburetor adjust-
ments.
Muffler
CAUTION! Muffler is fitted with a catalytic
converter designed to reduce harmful ex-
haust gases.
The muffler is designed to reduce the noise
level and to direct the exhaust gases away
from the operator. The exhaust gases are
hot and can contain sparks, which may
cause fire if directed against dry and com-
bustible material.
Mufflers are equipped with a special spark
arrestor mesh. You should clean the mesh
at least once a month. This is best done
with a wire brush. If the mesh is damaged
it should be replaced. Ifthemeshisfre-
quently blocked, this can be a sign that the
performance of the catalytic converter is
impaired. Contact your dealer to inspect
the muffler. A blocked mesh will cause the
machine to overheat and result in damage
to the cylinder and piston.
Muffler bolts
CAUTION! Never use a machine that has
a faulty or loose muffler. Ensure the muffler
bolts are tight.
Spark arrestor mesh

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115345726 Rev. 1 1/25/10
MAINTENANCE
WARNING: The inside of the
muffler contain chemicals that may
be carcinogenic. Avoid contact with
these elements in the event of a
damaged muffler.
WARNING: Bear in mind that:
Engine exhaust fumes contain car-
bon monoxide, which can cause
carbon monoxide poisoning. For
this reason you should not start or
run the machine indoors, or any-
where that is poorly ventilated.
The exhaust fumes from the engine
are hot and may contain sparks
which can start a fire. Never start
the machine indoors or near com-
bustible material!
Spark plug
The spark plug condition is influenced by:
SIncorrect carburetor adjustment.
SAn incorrect fuel mixture (too much or in-
correct type of oil).
SA dirty air filter.
These factors cause deposits on the spark
plug electrodes, which may result in operat-
ing problems and starting difficulties.
If the machine is low on power, difficult to
start or runs poorly at idle speed: always
check the spark plug first before taking
any further action. If the spark plug is dirty,
clean it and check that the electrode gap is
0,6 mm. The spark plug should be replaced
after about a month in operation or earlier if
necessary.
CAUTION! Always use the recommended
spark plug type! Use of the wrong spark
plug can damage the piston/cylinder.
0,6 mm
Air filter
The air filter must be regularly cleaned to
remove dust and dirt in order to avoid:
SCarburetor malfunctions
SStarting problems
SLoss of engine power
SUnnecessary wear to engine parts
SExcessive fuel consumption
Clean the filter every 25 hours, or more
regularly if conditions are exceptionally
dusty.
Cleaning the air filter
Remove the air filter cover and take out the
filter. Wash it clean in warm, soapy water.
Rinse thoroughly. Ensure that the filter is dry
before refitting it.
An air filter that has been in use for a long
time cannot be cleaned completely. The
filter must therefore be replaced with a new
one at regular intervals. A damaged air
filter must always be replaced.
WARNING: Mufflers fitted with
catalytic converters get very hot
duringuseandremainsoforsome
time after stopping. This also applies
at idle speed. Contact can result in
burns to the skin. Remember the risk
of fire!

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115345726 Rev. 1 1/25/10
MAINTENANCE
Maintenance schedule
The following is a list of the maintenance that must be performed on the machine. Most of
the items are described in the Maintenance section. The user must only carry out the main-
tenance and service work described in this Operator’s Manual. More extensive work must
be carried out by an authorised service workshop.
Maintenance Daily
Maintenance Weekly Maintenance Monthly
Maintenance
Clean the outside of the machine.
Make sure the throttle trigger lock and the
throttle function correctly from a safety point
of view.
Check that the stop switch works correctly.
Check that the cutting attachment does not
rotate at idle.
Clean the air filter. Replace if necessary.
Check that the cutting attachment guard is
undamaged and not cracked. Replace the
cutting attachment guard if it has been
exposed to impact or is cracked.
Check that the trimmer head is undamaged
and not cracked. Replace the trimmer head
if necessary.
Check that nuts and screws are tight.
Check that there are no fuel leaks from the
engine, tank or fuel lines.
Check the starter and starter cord.
Clean the outside of the spark plug. Re-
move it and check the electrode gap. Adjust
the gap to 0,6 mm or replace the spark plug.
Check that the spark plug is fitted with a
suppressor.
Clean the outside of the carburetor and the
space around it.
Check the fuel filter from contamination and
the fuel hose from cracks or other defects.
Replace if necessary.
Check all cables and connections.
Check the clutch, clutch springs and the
clutch drum for wear. Replace if necessary
by an autorized service workshop.
Replace the spark plug. Check that the
spark plug is fitted with a suppressor.
Clean or replace the spark arrestor mesh
on the muffler.
X
X
X
X
X
X
X
X
XX
X
X
X
X
X
X
X

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115345726 Rev. 1 1/25/10
TECHNICAL DATA
Technical data 124C
Engine
Cylinder volume, cm328
Cylinder bore, mm 35
Stroke, mm 28,7
Idle speed, rpm 2,800--3,200
Recommended max. speed, rpm 10000
Speed of output shaft, rpm 8000
Max. engine output, acc. to ISO 8893, hp/kW 0,8
Catalytic converter muffler Yes
Speed--regulated ignition system Yes
Ignition system
Spark plug Champion RCJ--8Y
Electrode gap, mm 0,6
Fuel and lubrication system
Fuel tank capacity, litre 0,4
Weight
Weight without fuel, cutting attachment and guard, kg 4,4
Noise emissions
(see Note 1)
Sound power level, measured dB(A) 109
Sound power level, guaranteed LWA dB(A) 114
Noise levels
(see Note 2)
Equivalent sound pressure level at the operators’ ear,
measured according to EN ISO 11806 and ISO 22868,
dB(A)
Equipped with trimmer head (original) 100
Vibration levels
(see Note 3)
Equivalent vibration levels (ahv,eq) at handles, measured
according to EN ISO 11806 and ISO 22867, m/s2
Equipped with trimmer head (original), left/right 4,8/6,4
Note 1: Noise emissions in the environment measured as sound power (LWA) in conformi-
ty with EC directive 2000/14/EC. Reported sound power level for the machine has been
measured with the original cutting attachment that gives the highest level. The difference
between guaranteed and measured sound power is that the guaranteed sound power also
includes dispersion in the measurement result and the variations between different ma-
chines of the same model according to Directive 2000/14/EC.
Note 2: Reported data for equivalent sound pressure level for the machine has a typical
statistical dispersion (standard deviation) of 1 dB(A).
Note 3: Reported data for equivalent vibration level has a typical statistical dispersion
(standard deviation) of 1 m/s2.
Model 124C (3/8 RH arbor shaft thread)
Approved accessories Type Cutting attachment /guard, part. no.
Trimmer head T25C (∅2,0 -- 2,4 mm line) 537 33 83--07 / 545 00 60--95

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115345726 Rev. 1 1/25/10
DECLARATION OF CONFORMITY
EC Declaration of Conformity (Only applies to Europe)
We, Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel: [phone], as authorised
representativeintheCommunity,declarethatthegrasstrimmermodelHusqvarna 124C with
serial numbers dating from 2009 and onwards (the year is clearly stated on the rating plate,
followed by the serial number), comply with the requirements of the COUNCIL’S
DIRECTIVES:
of 17 May 2006 “relating to machinery” 2006/42/EC;
of15December2004“relatingtoelectromagnetic compatibility”2004/108/EC, andapplicable
supplements; and
of 8 May 2000 “relating to the noise emissions in the environment” in accordance with Annex
Vof2000/14/EC. For information relating to noise emissions, see Technical data section.
The following standards have been applied:EN12100--1:2003, EN 12100--2:2003, EN ISO
11806:1997 and CISPR 12:2005.
SMP, The Swedish Machinery Testing Institute, Fyrisborgsgatan 3 S--754 50 Uppsala,
Sweden, has performed voluntary type examination on behalf of Husqvarna AB. The
certificate(s) are numbered: SEC/09/2020.
0 9 -- 11 -- 0 1
Ronnie E. Goldman, Director of Engineering
Authorized representative for Husqvarna AB and
responsible for technical documentation