524LK
EN Operator's manual 2-24
Contents
Introduction..................................................................... 2
Safety..............................................................................4
Safety instructions for maintenance..............................10
Assembly...................................................................... 11
Operation...................................................................... 12
Maintenance................................................................. 15
Troubleshooting............................................................ 20
Transportation and storage...........................................20
Technical data.............................................................. 21
Accessories.................................................................. 22
EC Declaration of Conformity....................................... 24
Introduction
Product description
The product is a grass trimmer with a combustion
engine.
Work is constantly in progress to increase your safety
and efficiency during operation. Speak to your servicing
dealer for more information.
Intended use
The product is used with a trimmer head to cut grass.
Do not use the product for other tasks than grass
trimming and grass clearing.
Note: National regulations can set limit to the
operation of the product.
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Product overview
2
3
5
20
6
7
9
10
11
12
13
14
15
8
16
4
17
4
18
19
21
1
1. Trimmer head
2. Bevel gear
3. Grease filler cap
4. Cutting attachment guard
5. Shaft
6. Loop Handle
7. Stop switch
8. Throttle trigger
9. Throttle trigger lockout
10. Cylinder cover
11. Starter rope handle
12. Air purge bulb
13. Fuel tank
14. Choke control
15. Air filter cover
16. Handle adjustment
17. Drive disc
18. Hex key
19. Locking pin
20. Shaft coupling
21. Operator's manual
Symbols on the product
WARNING! This product is dangerous.
Injury or death can occur to the operator
or bystanders if the product is not used
carefully and correctly. To prevent injury
to the operator or bystanders, read and
obey all safety instructions in the
operator's manual.
1309 - 004 - 23.03.2021 3
Read the operator's manual carefully and
make sure that you understand the
instructions before you use this product.
This product complies with applicable EC
Directives.
Use a protective helmet in locations where
objects can fall on you. Use approved
hearing protection. Use approved eye
protection.
Use approved protective gloves.
Use heavy-duty slip-resistant boots.
The product can cause objects to eject,
which can cause injury.
Maximum speed of the output shaft.
5
0
FT
1
5
m
50F
T
15 m
Keep a minimum of 15 m distance to
persons and animals during operation of
the product.
Only use flexible cutting wire. Do not use
metal cutting equipment for grass
trimming.
The arrows show the limit for the handle
position.
Air purge bulb.
Choke.
Fuel.
Noise emissions to the environment
according to European Directive
2000/14/EC and New South Wales
legislation "Protection of the Environment
Operations (Noise control) Regulation
2017". Noise emission data can be found
on the machine label and in the
Technical
data
chapter.
yyyywwxxxx The rating plate shows the
serial number. yyyy is the
production year, ww is the
production week.
Note: Other symbols/decals on the product refer to
certification requirements for some markets.
Safety
Safety definitions
Warnings, cautions and notes are used to point out
specially important parts of the manual.
WARNING: Used if there is a risk of
injury or death for the operator or bystanders
if the instructions in the manual are not
obeyed.
CAUTION: Used if there is a risk of
damage to the product, other materials or
the adjacent area if the instructions in the
manual are not obeyed.
Note: Used to give more information that is necessary
in a given situation.
General safety instructions
WARNING: Read the warning
instructions that follow before you use the
product.
• A clearing saw, brushcutter or trimmer can be
dangerous if used carelessly or incorrectly and can
cause serious injury or death to the operator or
others. It is extremely important that you read and
understand the contents of this operator’s manual.
4 1309 - 004 - 23.03.2021
• Under no circumstances may the design of the
product be modified without the permission of the
manufacturer. Never use a product that has been
modified in any way from its original specification
and always use original accessories. Non-authorized
modifications and/or accessories can result in
serious personal injury or the death of the operator
or others.
• The inside of the muffler contain chemicals that may
be carcinogenic. Avoid contact with these elements
in the event of a damaged muffler.
• This product produces an electromagnetic field
during operation. This field may under some
circumstances interfere with active or passive
medical implants. To reduce the risk of serious or
fatal injury, we recommend persons with medical
implants to consult their physician and the medical
implant manufacturer before operating this product.
Safety instructions for operation
WARNING: Read the warning
instructions that follow before you use the
product.
• You must understand the difference between grass
clearing and grass trimming before use.
• If you encounter a situation where you are uncertain
how to proceed you should ask an expert. Contact
your dealer or your service workshop. Avoid all
usage which you consider to be beyond your
capability.
• Never use a product that is faulty. Carry out the
safety checks, maintenance and service instructions
described in this manual. Some maintenance and
service measures must be carried out by trained and
qualified specialists. Refer to
Maintenance on page
15
.
• All covers, guards and handles must be fitted before
you start the product. Ensure that the spark plug cap
and ignition lead are undamaged to avoid the risk of
electric shock.
• Never use the product if you are fatigued, while
under the influence of alcohol or drugs, medication
or anything that could affect your vision, alertness,
coordination or judgement.
• Do not use the product in bad weather such as
dense fog, heavy rain, strong wind, intense cold,
etcetera. Working in bad weather is tiring and often
brings added risks, such as icy ground,
unpredictable felling direction, etcetera.
• The only accessories you can operate with this
engine unit are the cutting attachments that we
recommend. Refer to
Accessories on page 22
.
• Never allow children to use or be in the vicinity of the
product. As the product is equipped with a spring-
loaded start/stop switch and can be started by low
speed and force on the starter handle, even small
children under some circumstances can produce the
force necessary to start the product. This can mean
a risk of serious personal injury. Therefore remove
the spark plug cap when the product is not under
close supervision.
• Running an engine in a confined or badly ventilated
area can result in death due to asphyxiation or
carbon monoxide poisoning.
• The complete clutch cover and shaft must be fitted
before the product is started, otherwise the clutch
can come loose and cause personal injury.
• Ensure that no people or animals come closer than
15 m while you work. When several operators are
working in the same area the safety distance should
be at least 15 m. Otherwise there is a risk of serious
personal injury. Stop the product immediately if
anyone approaches. Never swing the product
around without first checking behind you to make
sure that noone is within the safety zone.
• Ensure that people, animals or other things can not
affect your control of the product or that they do not
come in contact with the cutting attachment or loose
objects that are thrown out by the cutting
attachment. However, do not the product unless you
are able to call for help in the event of an accident.
• Always inspect the working area. Remove all loose
objects such as stones, broken glass, nails, steel
wire, string, etcetera, that could be thrown out or
become wrapped around the cutting attachment.
• Make sure that you can move and stand safely.
Check the area around you for possible obstacles
(roots, rocks, branches, ditches, etcetera) in case
you have to move suddenly. Take great care when
you work on sloping ground.
• Keep a good balance and a firm foothold at all times.
Do not overreach.
• Always hold the product with both hands. Hold the
product on the right side of your body.
• Keep the cutting attachment below waist level.
• Switch off the engine before you move to another
area. Fit the transportation guard before you carry or
transport the equipment any distance.
• Never put the product down with the engine running
unless you have it in clear sight.
• Stop the engine and cutting equipment before you
remove material that has wound around the blade
shaft. Neither the operator of the product nor anyone
1309 - 004 - 23.03.2021
5
else may attempt to remove the cut material while
the engine is running or the cutting equipment is
rotating, as this can result in serious injury. The
bevel gear can get hot during use and may remain
so for a while afterwards. You could get burnt if you
touch it.
• Watch out for thrown objects. Always wear approved
eye protection. Never lean over the cutting
attachment guard. Stones, rubbish, etcetera, can be
thrown up into the eyes which can cause blindness
or serious injury.
• Sometimes branches or grass get caught between
the guard and cutting attachment. Always stop the
engine before you clean the product.
• Always 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.
• Listen out for warning signals or shouts when you
wear hearing protection. Always remove your
hearing protection as soon as the engine stops.
• Overexposure to vibration can lead to circulatory
damage or nerve damage in people who have
impaired circulation. Contact your doctor if you
experience symptoms of overexposure to vibration.
These 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.
• Do not use a product with a damaged spark plug
cap.
• Do not use a product with a defective muffler.
• Keep all parts of your body away from the rotating
cutting attachment and hot surfaces.
• Never use a product with a faulty muffler
• Never start or use the product indoors, near
combustible material or in spaces that lacks proper
ventilation. The exhaust fumes from the engine
contain carbon monoxide, an odorless, poisonous
and highly dangerous gas. Also, the exhaust fumes
are hot and may contain sparks that can start a fire.
Personal protective equipment
WARNING:
Read the warning
instructions that follow before you use the
product.
• Always use approved personal protective equipment
when you use the product. Personal protective
equipment cannot fully prevent injury but it
decreases the degree of injury if an accident does
occur. Let your dealer help you select the right
equipment.
• Use approved hearing protection that provides
adequate noise reduction. Long-term exposure to
noise can result in permanent hearing impairment.
• Use approved eye protection. If you use a visor, you
must also use approved protective goggles.
Approved protective goggles must comply with the
ANSI Z87.1 standard in the USAs or EN 166 in EU
countries.
• Use gloves when necessary, for example when you
attach, examine or clean the cutting equipment.
• Use protective boots with steel toes and non-slip
soles.
• Use clothing made of a strong fabric. Always use
heavy, long pants and long sleeves. Do not use
loose clothing that can catch on twigs and branches.
Do not wear jewelry, short pants, sandals or go with
bare feet. Put your hair up safely above shoulder
level.
6
1309 - 004 - 23.03.2021
• Keep first aid equipment close at hand.
Safety devices on the product
WARNING: Read the warning
instructions that follow before you use the
product.
In this section the product’s safety features, its purpose
and how checks and maintenance should be carried out
to ensure that it operates correctly. See instructions
under the heading
Product overview on page 3
to find
where these parts are located on your product.
The life span of the product can be reduced and the risk
of accidents can increase if product maintenance is not
carried out correctly and if service and/or repairs are not
carried out professionally. If you need further information
please contact your nearest servicing dealer.
WARNING: Never use a product with
defective safety components. The product's
safety equipment must be inspected and
maintained as described in this section. If
your product fails any of these checks,
contact your service agent to get it repaired.
CAUTION: 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 professional repairs and
service. If the retailer who sells your
machine is not a servicing dealer, ask him
for the address of your nearest service
agent.
To do a check of the throttle trigger lockout
The throttle trigger lockout prevents accidental operation
of the throttle control.
1. Push the throttle trigger lockout (A) and make sure
that the throttle control is released (B).
A
B
2. Release the throttle trigger lockout and make sure
that the throttle control is locked at idle speed.
3. Push the throttle trigger lockout and make sure that it
goes back to its initial position when you release it.
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7
4. Make sure that the throttle control and throttle trigger
lockout move freely and that the return springs
operate correctly.
5. Start the product and apply full throttle. Refer to
To
start the product on page 14
.
6. Release the throttle control and make sure that the
cutting attachment stops. If the cutting attachment
rotates with the throttle in the idle position, do a
check of the carburetor adjustments. Refer to
Maintenance on page 15
.
To do a check of the stop switch
1. Start the engine.
2. Move the stop switch to the stop position and make
sure that the engine stops.
To do a check of the cutting attachment guard
WARNING: Do not use a cutting
attachment without an approved and
correctly attached cutting attachment guard.
Refer to,
Accessories on page 22
.
WARNING: Always use the
recommended cutting attachment guard for
the cutting attachment that you use. If an
incorrect or faulty cutting attachment guard
is fitted this can cause serious personal
injury. Refer to,
#
.
The cutting attachment guard prevents injuries from
objects that eject in the direction of the operator. It also
prevents injuries that occur if you touch the cutting
attachment.
1. Do a visual check for damages, for example cracks.
2. Replace the cutting attachment guard if it is
damaged.
To do a check of the vibration damping system
WARNING:
Use of incorrectly wound
cord or an incorrect cutting attachment
increases the level of vibration.
The vibration damping system decreases vibration in the
handles to a minimum which makes the operation
easier. The vibration damping system decreases the
vibrations between the engine unit and the shaft unit.
1. Stop the engine.
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1309 - 004 - 23.03.2021
2. Do a visual check for deformation and damage for
example, cracks.
3. Make sure that the vibration damping units are
attached correctly.
To do a check of the muffler
The muffler keeps noise levels to a minimum and sends
exhaust fumes away from the operator.
• Do a visual check for damage and deformation.
• Make sure that the muffler is correctly attached to
the product.
• If the muffler on your product has a spark arrester
screen, do a visual check. Replace the spark
arrester screen if it is damaged.
a) Clean the spark arrester screen if it is blocked. A
blocked spark arrester screen causes the engine
to become too hot which causes damage to the
engine.
b) Make sure that the spark arrestor mesh is
attached correctly.
To attach and remove the locknut
WARNING: Stop the engine, use
protective gloves and be careful around the
sharp edges of the cutting attachment.
A locknut is used to attach some types of cutting
attachments. The locknut has a left thread.
• To attach, tighten the locknut in the opposite
direction to the direction of turning of the cutting
attachment.
• To remove the locknut, loosen the locknut in the
same direction as the cutting attachment rotates.
• To loosen and tighten the locknut, use a socket
wrench with a long shaft. The arrow in the picture
shows the area where you can operate the socket
wrench.
WARNING:
When you loosen and
tighten the locknut, there is a risk of
injury from the blade. You must always
make sure that the blade guard prevents
injury to your hand when you do this.
Note: Make sure that you cannot turn the locknut by
hand. Replace the nut if the nylon lining does not have a
resistance of a minimum of 1.5 Nm. The locknut must be
replaced after it has been put on approximately 10
times.
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Cutting equipment
Select correct cutting equipment and do maintenance on
the cutting equipment to:
• Get maximum cutting performance.
• Increase lifetime of the cutting equipment.
WARNING: Only use cutting
attachments with the guards we
recommend! See
Accessories on page 22
.
Refer to the instructions for the cutting
attachment to find the correct way to load
the trimmer line and the correct trimmer line
diameter.
WARNING: A defective cutting
attachment may increase the risk of
accidents.
WARNING: Always stop the engine
before you do the work on the cutting
attachment. This continues to rotate after
you release the throttle. Make sure that the
cutting attachment has stopped fully and
disconnect the spark plug cap before you
start the work on it.
Trimmer head
WARNING: Always make sure the
trimmer line is wound tightly and evenly
around the drum to prevent harmful
vibration.
• Only use recommended trimmer heads and trimmer
lines.
• Only use recommended cutting attachments.
• Smaller machines requires small trimmer heads and
vice versa.
• The length of the trimmer line is important. A longer
trimmer line requires greater engine power than a
shorter trimmer line of the same diameter.
• Make sure that the cutter on the trimmer guard is
intact. This cuts the trimmer line to the correct
length.
• Soak the trimmer line in water for a couple of days
before use to increase the life length.
Fuel Safety
WARNING: Read the warning
instructions that follow before you use the
product.
• Never start the product if you spill fuel on it. Wipe the
spillage of and allow remaining fuel to evaporate.
• Never start the product if you spill fuel on yourself or
your clothes. Change your clothes and wash any
part of your body that has come in contact with fuel.
Use soap and water.
• Never start the product if the product is leaking fuel.
Check regularly for leaks from the fuel cap and fuel
lines.
• Always put the product on a flat surface and make
sure the cutting attachment cannot come in contact
with any object while you add fuel.
• Take care when handling fuel. Bear in mind the risk
off fire, explosion and inhaling fumes.
• Observe caution when handling fuel and make sure
there is adequate ventilation. Fuel and fuel fumes
are highly inflammable and can cause serious injury
when inhaled or allowed to come in contact with the
skin.
• Mix and pour fuel outdoors, where there are no
sparks or flames.
• Do not smoke or place hot objects near fuel.
• Always stop the engine and let it cool off for a few
minutes before you refuel.
• Open the fuel cap slowly so that any excess
pressure is released gently when you refuel.
• Tighten the fuel cap carefully after you refueled.
• Clean the area around the fuel cap. Contamination in
the tank can cause operating problems.
• Always move the product 3m (10ft) or further from
the refuelling area and source before starting.
Safety instructions for maintenance
WARNING: Always stop the engine
before you do any work on the cutting
attachment. The cutting attachment
continues to rotate even after the throttle
has been released. Ensure that the cutting
attachment has stopped completely and
disconnect the spark plug before you start to
work on it.
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WARNING: A faulty cutting attachment
may increase the risk of accidents.
WARNING: Make sure that the trimmer
cord is wound tightly and evenly around the
drum, otherwise the product will generate
harmful vibration.
• Only use cutting attachments with the guards we
recommend. Refer to
Accessories on page 22
.
Assembly
Introduction
WARNING: Before you assemble the
product, you must read and understand the
safety chapter.
WARNING: Remove the spark plug
cable from the spark plug before you
assemble the product.
To assemble the loop handle
1. Put the loop handle onto the shaft, between the
arrows.
2. Put the spacer into the slot of the loop handle.
3. Install the nut, the knob and the screw. Do not
tighten fully.
4. Adjust the product to an applicable operation
position.
5. Tighten the knob.
To assemble the two-piece shaft
1. Turn the knob to loosen the coupling.
2. Align the tab of the cutting attachment (A) with the
arrow of the coupling (B).
A
B
3. Carefully push the shaft into the coupling until you
hear a click.
4. Tighten the knob fully.
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To disassemble the two-piece shaft
1. Turn the knob 3 turns or more to loosen the
coupling.
2. Push and hold the button (C).
3. Hold tight in the end of the shaft that the engine is
attached to.
4. Pull the attachment straight out of the coupling.
C
To assemble the cutting attachment guard and
trimmer head
1. Attach the correct cutting attachment guard (A) for
the trimmer head. Refer to
Accessories on page 22
.
2. Put the cutting attachment guard onto the fitting on
the shaft.
3. Attach with the bolt (L).
A
A
B
C
4. Install the drive disc (B) on the output shaft.
5. Turn the output shaft until one of the holes in the
drive disc aligns with the related hole in the gear
housing.
6. Put the locking pin (C) in the hole to lock the shaft.
7. Turn the trimmer head /plastic blades (H) in the
opposite direction from which the trimmer head/
plastic blades rotates.
H
H
Operation
Introduction
WARNING: Before you operate the
product, you must read and understand the
safety chapter.
Before you operate the product
• Examine the work area to make sure that you know
the type of terrain, the slope of the ground and if
there are obstacles such as stones, branches and
ditches.
• Do an overhaul inspection of the product.
• Do the safety inspections, maintenance and
servicing that are given in this manual.
• Make sure that all covers, guards, handles and the
cutting equipment are correctly attached and not
damaged.
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• Make sure that there are no cracks at the bottom of
the grass blade teeth or by the center hole of the
blade. Replace the blade if it is damaged.
• Examine the support flange for cracks. Replace the
support flange if it is damaged.
• Make sure that the locknut can not be removed by
hand. If you can remove it by hand, it does not lock
the cutting attachment sufficiently and you must
replace it.
• Examine the trimmer head and trimmer guard for
damages or cracks. Replace the trimmer head and
trimmer guard if they have been hit or if they have
cracks.
Fuel
This product has a four-stroke engine.
CAUTION: Incorrect type of fuel can
result in engine damage.
Gasoline
• Use Husqvarna 4-stroke fuel for best performance
and extension of the engine life. The Husqvarna 4-
stroke fuel does not become bad or oxidized, which
keeps the maintenance intervals to a minimum.
• If Husqvarna 4-stroke fuel is not available, use good
quality unleaded gasoline with a maximum of 10%
ethanol contents.
CAUTION: Do not use gasoline with
an octane grade less than 90 RON/87
AKI. Use of a lower octane grade can
cause engine knocking, which causes
engine damages.
4-stroke oil
• Do a check of the engine oil level before you start
the product. Too low engine oil level can cause
damage to the engine. Refer to
To do a check of the
engine oil level on page 15
.
• When the product is new, replace the engine oil after
the first month or the first 10 hours of operation.
• Use Husqvarna 4-stroke oil for the best performance
and engine life. Speak to an approved service agent
to select the correct engine oil.
• If Husqvarna 4-stroke oil is not available, use a 4-
stroke oil of good quality with minimum API SG
rating. The recommended viscosity class is SAE
10W-40. Speak to an approved service agent to
select the correct oil.
CAUTION:
Do not use oil for two-
stroke engines.
To fill the fuel tank
WARNING: Obey the procedure that
follows for your safety.
1. Stop the engine and let the engine become cool.
1309 - 004 - 23.03.2021
13
2. Clean the area around the fuel tank cap.
3. Remove the fuel tank cap slowly to release the
pressure.
4. Fill the fuel tank.
CAUTION: Make sure that there is
not too much fuel in the fuel tank. The
fuel expands when it becomes hot.
5. Tighten the fuel tank cap carefully.
6. Clean fuel spillage on and around the product.
7. Move the product 3 m/10 ft or more away from the
refueling area and fuel source before you start the
engine.
Note: To see where the fuel tank is on your product,
refer to
Product overview on page 3
.
To start the product
1. Move the stop switch to the start position.
2. Set the choke control to the choke position.
3. Push the air purge bulb until fuel starts to fill the air
purge bulb.
4. Hold the product to the ground.
5. Pull the starter rope handle slowly with your right
hand until you feel resistance.
WARNING: Do not wind the starter
rope around your hand.
CAUTION: Do not pull the starter
rope to full extension and do not let go of
the starter rope handle. This can cause
damage to the product.
6. Pull the starter rope handle quickly and with force
until the engine starts.
7. Set the choke control to the operation position.
WARNING:
Keep body parts away
from the spark plug cap. Risk of burn
injuries. Do not use the product with a
damaged spark plug cap. Risk of
electrical shock.
14 1309 - 004 - 23.03.2021
To stop the product
• Move the stop switch to the stop position to stop the
engine.
Grass trimming with a trimmer head
To trim the grass
1. Hold the trimmer head immediately above the
ground at an angle. Do not push the trimmer line into
the grass.
2. Decrease the length of the trimmer line by 10-12
cm / 4-4.75 in.
3. Decrease the engine speed to decrease the risk of
damage to plants.
4. Use 80 % throttle when you cut grass near objects.
To cut the grass
1. Make sure that the trimmer line is parallel to the
ground when you cut the grass.
2. Do not push the trimmer head to the ground. This
can cause damage to the product.
3. Move the product from side to side when you cut
grass. Use full speed.
To sweep the grass
The airflow from the rotating trimmer line can be used to
remove cut grass from an area.
1. Hold the trimmer head and the trimmer line parallel
to the ground and above the ground.
2. Apply full throttle.
3. Move the trimmer head from side to side and sweep
the grass.
WARNING:
Clean the trimmer head
cover each time you assemble new trimmer
line to prevent unbalance and vibrations in
the handles. Also do a check of the other
parts of the trimmer head and clean it if
necessary.
Maintenance
Introduction
WARNING: Before you do any
maintenance work you must read and
understand the safety chapter.
To do a check of the engine oil level
1. Stop the engine and let the engine become cool.
2. Put the product on level ground.
1309 - 004 - 23.03.2021 15
3. Clean the area around the oil filler cap.
4. Remove the oil filler cap.
5. Remove the oil from the dipstick on the oil filler cap.
6. Put the oil filler cap back into the oil filler neck. Do
not tighten the oil filler cap in this step.
7. Pull out the oil filler cap and read the oil level on the
dipstick.
8. If the oil level is low, fill with engine oil until the oil is
at the edge of the oil filler neck. Only use
recommended engine oil. Refer to
4-stroke oil on
page 13
.
9. Install the oil filler cap and tighten it fully.
To adjust the idle speed
Your Husqvarna product is made to specifications that
decrease harmful emissions.
1. Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
2. Adjust the idle speed with the idle speed screw T
which is identified with "T" mark.
a) Turn the idle speed screw T clockwise until the
cutting attachment starts to rotate.
b) Turn the idle speed screw T counterclockwise
until the cutting attachment stops.
WARNING:
If the cutting
attachment does not stop when you
adjust the idle speed, speak to your
servicing dealer. Do not use the product
until it is correctly adjusted or repaired.
3. The idle speed is correct when the engine operates
smoothly in all positions. The idle speed must be
below the speed when the cutting attachment starts
to rotate.
Note: Refer to
#
for the recommended idle speed.
To do maintenance on the muffler
WARNING: The muffler decreases the
noise level and points the exhaust gases
away from the operator. The exhaust gases
are hot and can contain sparks. This can
cause fire if pointed against dry and
flammable material.
WARNING: Mufflers with catalytic
converters become hot during operation.
Risk of burn or fire. This also applies at idle
speed. To examine if your product has a
catalytic converter, refer to
#
.
1. Stop the engine and let the muffler become cool.
2. Remove the muffler cover.
3. If the muffler on your product has a spark arrester
screen, do these steps:
a) Do a visual check. Replace the spark arrester
screen if it is damaged.
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1309 - 004 - 23.03.2021
b) Clean the spark arrester screen if it is blocked.
Clean weekly if your product has a catalytic
converter. Clean monthly if your product does not
have a catalytic converter.
CAUTION: A blocked spark arrester
screen causes the engine to become too
hot which causes damage to the engine.
CAUTION: If the spark arrester screen
is frequently blocked, it can be a sign that
performance of the catalytic converter is
decreased. Speak to your servicing dealer to
examine the muffler. A blocked spark
arrester screen causes overheating and
results in damage to the cylinder and piston.
To clean the cooling system
The parts of the cooling system are the air intake on the
starter (A), the fins on the flywheel (B), the cooling fins
on the cylinder (C) and the cylinder cover (D).
B
C
A
D
1. Clean the cooling system with a brush weekly or
more frequently if it is necessary.
2. Make sure that the cooling system is not dirty or
blocked.
CAUTION:
A dirty or blocked
cooling system can make the product too
hot, which can cause damage to the
product.
To examine the spark plug
CAUTION: Always use the
recommended spark plug type. Incorrect
spark plug type can cause damage to the
product.
• Examine the spark plug if the engine is low on
power, is not easy to start or does not operate
correctly at idle speed.
• To decrease the risk of unwanted material on the
spark plug electrodes, obey these instructions:
a) Make sure that the idle speed is correctly
adjusted.
b) Make sure that the fuel mixture is correct.
c) Make sure that the air filter is clean.
• If the spark plug is dirty, clean it and make sure that
the electrode gap is correct, refer to
#
.
• Replace the spark plug if it is necessary.
To apply grease to the two-piece shaft
• Apply grease to the end of the drive shaft after each
30 hours of operation.
To clean the air filter
CAUTION:
An air filter that is damaged,
very dirty or soaked with fuel must always be
replaced.
1309 - 004 - 23.03.2021 17
An air filter that is used for a long time can not be fully
cleaned. Replace the air filter regularly and always
replace a defective air filter.
1. Move the choke lever up, to close the choke valve.
2. Remove the air filter cover and remove the air filter.
3. Clean the air filter with warm soap water.
4. Clean the inner surface of the air filter cover. Use air
or a brush.
5. Do a check of the surface of the rubber seal.
Replace the filter on the rubber seal if it is damaged.
6. Make sure that the filter is dry before you install it.
To apply oil to the foam air filter
CAUTION:
Always use Husqvarna
special air filter oil. Do not use other types of
oil.
WARNING: Put on protective gloves.
The air filter oil can cause skin irritation.
1. Put the foam air filter in a plastic bag.
2. Put the oil in the plastic bag.
3. Rub the plastic bag to supply the oil equally across
the foam air filter.
4. Push the unwanted oil out of the foam air filter while
in the plastic bag.
To lubricate the bevel gear
1. Remove the cutting equipment.
2. Put the product with the grease plug at its highest
position.
3. Remove the grease plug.
4. Look into the grease plug hole and turn the drive
shaft. The grease level (A) must be in level with the
top of the gear cogs (B).
A B
5. If the grease level is too low fill the bevel gear with
Husqvarna bevel gear grease. Fill slowly and turn
the drive shaft as you apply the bevel gear grease,
stop at the correct level (B).
CAUTION:
An incorrect quantity of
grease can cause damage to the bevel
gear.
6. Install the grease plug.
18
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Maintenance schedule
WARNING: Only do the maintenance
and servicing given in this operator's
manual. For maintenance or servicing that is
not given in this operator's manual, speak to
your servicing dealer.
Maintenance Daily Weekly Monthly
Clean the external surface. X
Make sure that the throttle trigger lockout and the throttle trigger operates cor-
rectly.
X
Do a check of the stop switch to make sure that it operates correctly. X
Make sure that the cutting attachment does not rotate at idle speed. X
Clean the air filter. Replace the air filter if it is necessary. X
Examine the cutting attachment guard for damages and cracks. Replace the
guard if it is hit or damaged.
X
Examine the trimmer head for damages and cracks. Replace the trimmer head if
it is damaged.
X
Make sure that the screws and nuts are tight. X
Examine the engine, the fuel tank and the fuel lines for leaks. X
Clean the cooling system. X
Examine the starter and the starter rope for damages. X
Examine the vibration damping elements for damages and cracks. X
Clean the external parts of the spark plug. Remove it and do a check of the elec-
trode gap. Adjust the electrode gap to the correct distance, refer to
Technical da-
ta on page 21
or replace the spark plug. Make sure that the spark plug is fitted
with a suppressor.
X
Clean the external parts of the carburetor and the area around it. X
Make sure that the bevel gear is filled correctly with grease, see
To lubricate the
bevel gear on page 18
. If not, use Husqvarna bevel gear grease.
X
Clean or replace the spark arrestor mesh on the muffler (only applies to mufflers
without a catalytic converter).
X X
Do a check of the fuel filter for contamination and the fuel hose for cracks or oth-
er defects. Replace parts if it is necessary.
X
Do a check of all the cables and connections. X
If it is necessary to replace the clutch, clutch springs or clutch drum, speak to
your servicing dealer.
X
Replace the spark plug. Make sure that the spark plug is fitted with a suppres-
sor.
X
1309 - 004 - 23.03.2021 19
Troubleshooting
The engine does not start
Check Possible cause Procedure
Stop switch. The stop switch is in the stop position. Set the stop switch to the start position.
Starter pawls. The starter pawls cannot move freely. Remove the starter cover and clean around
the starter pawls.
Let an approved service agent help you.
Fuel tank. Incorrect fuel type. Drain the fuel tank and fill with correct fuel.
Spark plug. The spark plug is dirty or wet. Make sure that the spark plug is dry and
clean.
The spark plug electrode gap is incorrect. Clean the spark plug. Make sure that the
electrode gap is correct. Make sure that the
spark plug has a supressor.
Refer to technical data for correct electrode
gap.
The spark plug is loose. Tighten the spark plug.
The engine starts but stops again
Check
Possible cause Procedure
Fuel tank. Incorrect fuel type. Empty the fuel tank and fill it with cor-
rect fuel.
Air filter. The air filter is clogged. Clean the air filter.
Transportation and storage
Transportation and storage
• Always allow the product to cool down before
storage.
• For storage and transportation of the product and
fuel, make sure that there are no leaks or fumes.
Sparks or open flames, for example from electrical
devices or boilers, can start a fire.
• Always use approved containers for storage and
transportation of fuel.
• Empty the fuel before transportation or before long-
term storage. Discard the fuel at an applicable
disposal location.
• Attach the transport guard during transportation and
storage.
• Remove the spark plug cap from the spark plug.
• Attach the product during transportation. Make sure
that it cannot move.
• Clean and do servicing on the product before long-
term storage.
20 1309 - 004 - 23.03.2021
Technical data
Technical data
524LK
Engine
Cylinder displacement, cm
3
25
Idle speed, rpm 3100
Maximum engine power acc. to ISO 8893, kW/hp @ rpm 0.7/7000
Catalytic converter muffler No
Speed of output shaft, rpm 8300
Ignition system
Spark plug NGK CMR5H
Electrode gap, mm 0.6
Fuel system and lubrication system
Fuel tank capacity, l/cm
3
0.55/550
Weight
Weight, kg 5.4
Noise emissions
1
Sound power level, measured dB(A) 106
Sound power level, guaranteed L
WA
dB(A) 107
Sound levels
2
Equivalent sound pressure level at the operator's ear, measured according to EN ISO 11806 and ISO 22868, dB(A):
Equipped with trimmer head (original) 97
Vibration levels
3
Equivalent vibration levels (a
hv,eq
) at handles, measured according to EN ISO 11806 and ISO 22867, m/s
2
:
Equipped with trimmer head (original), front/rear 8.5/6.5
1
Noise emissions in the environment measured as sound power ( L
WA
) in conformity 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 guaran-
teed sound power also includes dispersion in the measurement result and the variations between different
machines of the same model according to Directive 2000/14/EC.
2
Reported data for equivalent sound pressure level for the product has a typical statistical dispersion (standard
deviation) of 1 dB(A).
3
Reported data for equivalent vibration level has a typical statistical dispersion (standard deviation) of 1 m/s
2
.
1309 - 004 - 23.03.2021 21
Accessories
Accessories
The accessories used in combination with the specified
power heads have been evaluated to ANSI B175.3-2013
Grass Trimmers and Brushcutters Safety Requirements.
These combinations have been evaluated by
Underwriters Laboratories Inc. (UL) and are
consequently UL listed.
524LK
Approved accessories Type Cutting attachment guard, art. no.
Blade shaft thread M10
Plastic blades Tricut Ø 255 mm (separate blades
have part number 531 01 77-15)
588 54037-01/ 58811 79-01
503 93 42-02 / 503 97 71-01
Tricut Ø 300 mm (separate blades
have part number 531 01 77-15)
588 54 37-01
Trimmer head Trimmy Fix (Ø 2.4 mm cord) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 503 97 71-01
Superauto II (Ø 2.4-2.7 mm cord) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 503 97 71-01
S35 (Ø 2.4-3.0 mm cord) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 50397 71-01
T25 (Ø 2.0 - 2.7 mm line) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 503 97 71-01
T35, T35x (Ø 2.4-3.0 mm cord) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 503 97 71-01
Alloy (Ø 2.0-3.3 mm cord) 588 54 37-01 / 588 11 79-01
503 93 42-02 / 503 97 71-01
The accessories are recommended for use in
combination with the specified power heads and have
been evaluated to applicable ISO- and EN safety
requirement standards by the Swedish Machinery
Testing Institute.
Approved attachments Use with
Clean sweep attachment SR600-2 524LK
Hedge trimmer attachment HA110 524LK
Hedge trimmer attachment HA850 524LK
Edger attachment EA850 524LK
Saw attachment PA1100 524LK
22 1309 - 004 - 23.03.2021
Approved attachments Use with
Trimmer attachment TA850 524LK
Extension attachment EX850 524LK
Cultivator attachment CA230 524LK
Blower attachment BA101 524LK
Bristle brush attachment BR600 524LK
Dethatcher attachment DT600 524LK
Brushcutter attachment BCA850-24 524LK
Saw attachment PAX1100 524LK
Saw attachment PAX730 524LK
1309 - 004 - 23.03.2021 23
EC Declaration of Conformity
EC Declaration of Conformity
Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel:
+46-36-146500, declares that the brushcutter
Husqvarna 524LK with serial numbers dating from 2016
and onwards (the year is clearly stated on the rating
plate, followed by the serial number), comply with the
requirements of the COUNCIL’S DIRECTIVE:
• of May 17, 2006 ”relating to machinery” 2006/42/EC
• of February 26, 2014 ”relating to electromagnetic
compatibility” 2014/30/EU
• of May 8, 2000 ”relating to the noise emissions in the
environment” 2000/14/EC. Conformity assessment
according to Annex V. For information relating to
noise emissions, refer to
Technical data on page 21
.
• of June 8, 2011 ”on the restriction of the use of
certain hazardous substances in electrical and
electronic equipment” 2011/65/EU.
The following standards have been applied:
EN ISO 12100:2010, EN ISO 11806-1:2011, ISO
14982:1998, CISPR 12:2007, EN 50581:2012
RISE SMP Svensk Maskinprovning AB, Box 7035,
SE-750 07 Uppsala, Sweden, has performed voluntary
type examination on behalf of Husqvarna AB. The
certificate is numbered: SEC/09/2168.
RISE SMP Svensk Maskinprovning AB has also verified
agreement with appendix V of the council’s directive
2000/14/EG. The certificate have the number:
01/164/037.
Huskvarna, 2016-03-30
Per Gustafsson, Development Manager (Authorized
representative for Husqvarna AB and responsible for
technical documentation)
24
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26 1309 - 004 - 23.03.2021
1309 - 004 - 23.03.2021 27
www.husqvarna.com
Original instructions
114246826
2021-03-25
