535LK
EN Operator's manual 2-24
Contents
Introduction..................................................................... 2
Safety..............................................................................4
Assembly........................................................................ 9
Operation...................................................................... 12
Maintenance................................................................. 15
Troubleshooting............................................................ 19
Transportation, storage and disposal........................... 20
Technical data.............................................................. 20
Accessories.................................................................. 21
Declaration of Conformity............................................. 23
Appendix ......................................................................25
Introduction
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.
Product overview
1
1
2
8
19
21
9
11
12
20
10
16
22
23
3
5
6
4
4
17
18
14
7
13
15
1. Trimmer head
2. Grease filler cap
3. Bevel gear
4. Cutting attachment guard
5. Shaft
6. Loop Handle
7. Throttle trigger
8. Stop switch
9. Throttle trigger lockout
10. Spark plug cap and spark plug
11. Cylinder cover
12. Starter rope handle
13. Fuel tank
14. Air filter cover
15. Air purge bulb
16. Choke control
17. Handle adjustment
18. Drive disc
19. Operator's manual
20. Hex key
2 331 - 012 - 25.09.2023
21. Locking pin
22. Shaft coupling
23. Combination wrench
Symbols on the product
WARNING! Be careful and use the
product correctly. This product can cause
serious injury or death to the operator or
others.
Read the operator's manual carefully
and make sure that you understand the
instructions before you use this product.
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.
Risk of blade thrust if the cutting
equipment touches an object that it does
not immediately cut. The product can cut
off body parts. 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.
Stop.
Idle adjustment screw.
High speed needle.
Low speed needle.
The arrows show the limit for the handle
position.
Air purge bulb.
Choke.
Fuel.
Noise emission to the environment
label as per EU and UK directives
and regulations, and New South Wales
legislation "Protection of the Environment
Operations (Noise Control) Regulation
2017". The guaranteed sound power level
of the product is specified in
Technical
data on page 20
and on the label.
The product agrees with the applicable
EC directives.
This product conforms to applicable UK
regulations.
yyyywwxxxx The rating plate shows the
serial number. yyyy is the
production year, ww is the
production week.
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Note: Other symbols/decals on the product refer to
certification requirements for some markets.
Euro V Emissions
WARNING: Tampering with the engine
voids the EU type-approval of this product.
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.
• 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.
• A used muffler/spark arrester and spark arrester
mounting face may contain deposits of combustion
particles that may be carcinogenic. Avoid being
exposed to these compounds when handling the
muffler and/or spark arrester. Prior to any handling
of the muffler and/or the spark arrester, refer to
To
do a check of the muffler on page 8
.
• 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 21
.
• 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.
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• 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 no one 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 use 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
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 damaged 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 correct
equipment.
• Use a helmet if the trees in the work area have a
height of more than 2 m/6.5 ft.
• Use approved hearing protection.
• Always use approved protective googles that comply
with ANSI Z87.1 standard in the USA or EN 166 in
331 - 012 - 25.09.2023
5
EU countries.Use visor for face protection. Visor is
not enough to protect the eyes.
+
• Use gloves when it is necessary, for example when
you attach, examine or clean the cutting equipment.
• Use protective boots with steel toe-cap 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 use jewelry, short pants or sandals. Do not
go with bare feet. Put your hair up safely above
shoulder level.
• Keep first aid equipment near.
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 2
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
damaged 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 lockout is designed to prevent accidental
operation of the throttle control.
1. Press the throttle trigger lockout (A) and make
sure that the throttle control is released (B). When
you release the handle the throttle control and
the throttle trigger lockout both move back to their
initial positions. This movement is controlled by
two independent return springs. This arrangement
means that the throttle control is automatically
locked at the idle setting.
A
B
2. Make sure that the throttle control is locked at
the idle setting when the throttle trigger lockout is
released.
3. Press the throttle trigger lockout and make sure that
it returns to its intial position when you release it.
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331 - 012 - 25.09.2023
4. Do a check of the throttle control and throttle trigger
lockout move freely and that the return springs work
properly.
5. Start the product (refer to the instructions under
To
prepare the product for start on page 13
) and apply
full throttle.
6. Release the throttle and make sure that the cutting
attachment stops and remains at a standstill. If the
cutting attachment rotates with the throttle in the idle
position the carburettor idle setting must be checked.
See instructions under the chapter
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 21
.
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,
Technical data on page 20
.
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
Note: Use of incorrectly wound cord or an incorrect
cutting attachment increases the level of vibration. See
instructions under
Accessories on page 21
.
The vibration damping system decreases vibration in
the handles to a minimum which makes the operation
easier. The vibration damping system of the product
decreases the transfer of vibration between the engine
unit and the shaft unit of the product.
1. Stop the engine.
2. Do a visual check for deformation and damage for
example, cracks.
331 - 012 - 25.09.2023
7
3. Make sure you attach the elements of the vibration
damping system correctly.
To do a check of the muffler
WARNING: Bear in mind that the
exhaust fumes from the engine are hot and
may contain sparks which can start a fire.
Never start the product indoors or near
combustible material!
WARNING: Never use the machine
indoors or in spaces lacking proper
ventilation. Exhaust fumes contain carbon
monoxide, an odourless, poisonous and
highly dangerous gas.
WARNING: Do not use a product that
has a damaged muffler or a muffler that
is in bad condition. Return the product to
a Husqvarna dealer/service station if the
muffler is damaged.
WARNING: A used muffler/spark
arrester and spark arrester mounting
face may contain deposits of combustion
particles on the surfaces that may be
carcinogenic. To avoid skin contact and
inhalation of such particles when cleaning
and/or servicing the spark arrester, make
sure you always:
• wear gloves;
• clean and/or service in a well ventilated
area;
• do not use pressurized air to clean the
spark arrester screen;
• use a steel brush and brush away from
your body when cleaning the spark
arrester.
The muffler keeps noise levels to a minimum and sends
exhaust fumes away from the operator. For mufflers it is
very important that you follow the instructions on how to
check, maintain and service your product.
• Do a visual check for damage and deformation.
Note: Do not remove the muffler from the product.
• 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 mesh will make the engine overheated
which can cause serious damage.
8
331 - 012 - 25.09.2023
b) Make sure that the spark arrestor mesh is
attached correct.
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.
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 21
.
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.
331 - 012 - 25.09.2023 9
To attach the loop handle
1. Attach the loop handle onto the shaft between the
arrows.
2. Move the spacer into the slot of the loop handle.
3. Install the nut, the knob and the bolt. Do not tighten
the bolt fully.
4. Adjust the product to a correct position.
5. Tighten the bolt.
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.
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 to 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 21
.
2. Put the cutting attachment guard onto the fitting on
the shaft.
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331 - 012 - 25.09.2023
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
To disassemble the cutting attachment guard
and trimmer head
1. Turn the trimmer head /plastic blades (H) in the
direction from which the trimmer head/plastic blades
rotates.
H
H
2. Pull the locking pin (C) out from the hole to unlock
the shaft.
3. Remove the drive disc (B) on the output shaft.
4. Loosen the bolt(L) from the cutting attachment
guard-fitting on the shaft.
A
A
B
C
5. Remove the cutting attachment guard (A).
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Operation
Fuel
This product has a two-stroke engine.
CAUTION: Incorrect type of fuel can
result in engine damage. Use a mixture of
gasoline and two-stroke oil.
Gasoline
CAUTION: Always use a quality
gasoline/oil mixture of at least 90 octane
(RON). There is a risk that use of lower
octane grade causes knocking. This gives
rise to high engine temperature, which can
result in serious engine damage.
CAUTION: If your product is equipped
with a catalytic converter use a good quality
unleaded gasoline/oil mixture. Leaded
gasoline will destroy the catalytic converter.
• Use low-emission gasoline, also know as alkylate
gasoline, if it is available.
• Ethanol blended fuel, E10 may be used (max 10%
ethanol blend). Using ethanol blends higher than
E10 will cause lean running condition which can
damage the engine.
• We recommend a higher octane rating when you do
work at continuous high speed.
Husqvarna alkylate fuel
We recommend you to use Husqvarna alkylate fuel for
best performance. The fuel contains less dangerous
material compared to regular fuel, which decreases
dangerous exhaust fumes. The fuel gives a low quantity
of dangerous remainings when it is combusted, which
keeps the components of the engine more clean. This
extends the life of the engine. Husqvarna alkylate fuel is
not available in all markets.
Two-stroke oil
CAUTION: Unsatisfactory oil quality
and/or incorrect oil/fuel ratio can damage
the product and decrease the life time of
catalytic converters.
CAUTION: Do not use two-stroke oil
for water-cooled outboard engines, also
referred to as outboard oil.
CAUTION: Do not use oil for four-stroke
engines.
• For best results and performance use Husqvarna
two-stroke oil.
• If Husqvarna two-stroke oil is not available, use a
different two-stroke oil of good quality for air-cooled
engines. Speak to your servicing dealer to select the
correct oil.
Gasoline, l
Two-stroke oil, l
2% (50:1)
5 0.10
10 0.20
15 0.30
20 0.40
To mix gasoline and two-stroke oil
CAUTION:
There is a risk that small
errors influence the ratio of the mixture
drastically when you mix small quantities of
fuel. Carefully measure the quantity of oil
to be mixed to make sure that you get the
correct mixture.
12 331 - 012 - 25.09.2023
1. Fill half the quantity of the gasoline to be used.
2. Add the full quantity of oil and mix (shake) the fuel
mixture.
3. Add the remaining quantity of gasoline.
4. Carefully mix (shake) the fuel mixture and fill the fuel
tank of the product.
5. Empty and clean the fuel tank if you do not use the
product for some time.
Note: Do not mix fuel for more than 1 month at a time
and always mix gasoline and oil in a clean container
intended for fuel.
To fill the fuel tank
1. Clean the area around the fuel tank cap.
2. Shake the container and make sure that the fuel is
fully mixed. Use a fuel container with an anti-spill
valve.
3. Fill the fuel tank.
4. Tighten the fuel tank cap carefully.
5. Move the product 3 m (10 ft) or more away from the
refueling area and fuel source before starting.
CAUTION: Contamination in the tanks
causes malfunction. Clean the fuel tank and
chain oil tank regularly and replace the fuel
filter one time a year or more.
Before you operate the product
• Examine the work area to make sure that you know
the type of terrain. Examine the slope of the ground
and if there are obstacles such as stones, branches
and ditches.
• Do an overall inspection of the product.
• Do the safety inspections, maintenance and
servicing that are given in this manual.
• Make sure that all covers, trimmer guard and
trimmer head correctly attached and not damaged
or cracked. Replace if they are exposed to impact or
cracked.
WARNING:
Do not use the product
without a guard or a with a damaged guard.
To prepare the product for start
1. Press the air purge again and again until the fuel
starts to fill the bulb.
Note: It is not necessary to fully fill the bulb.
2. Move the choke control up into choke position.
WARNING:
The cutting attachment
will start to rotate immediately when you
start the engine with the choke.
331 - 012 - 25.09.2023 13
To start the product
WARNING: Read the warning
instructions in the safety chapter before you
start the product (refer to
Safety on page 4
).
1. Use protective gloves.
2. Hold the body of the product on the ground with your
left hand.
CAUTION: Do not use your feet!
3. Hold the starter rope handle with your right hand.
4. Slowly pull out the starter rope with your right hand
until you feel some resistance (the starter pawls
grip).
WARNING: Do not twist the starter
rope around your hand.
5. Pull the cord quickly and with power.
CAUTION: Do not pull the starter
rope all the way out and do not let go off
the starter rope handle when the starter
rope is fully extended. This can cause
damage to the product.
6. Pull the starter rope until the engine starts or for a
maximum of 5 times.
7. Reset the choke when the engine starts or after you
pull the starter rope 5 times.
8. If it is necessary, pull the starter rope again and
again until the engine starts.
9. Let the engine run for 10 seconds.
10. Operate the throttle gradually.
11. Make sure the engine runs smoothly.
Note:
If the engine stops, do the procedure again.
About the surface
WARNING:
Do not put parts of your
body in the grey marked area. If you touch
the grey marked area it can result in burns
to the skin. It can also cause electrical shock
if the spark plug cap has been damaged.
Do not use a product with a damaged spark
plug cap.
To stop the product
1. Move the stop switch into the stop position to stop
the engine.
CAUTION: The stop switch
automatically goes back to its initial
position. In order to prevent accidental
starting, the spark plug cap must
be removed from the spark plug
when assembling, checking and/or
maintenance is done.
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.
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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
To adjust the idle speed
Your Husqvarna product is designed and made to
specifications that decrease harmful emissions.
• Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
• Adjust the idle speed with the idle adjustment screw
T which is identified with "T" mark.
WARNING: If the cutting
attachment does not stop when you
adjust the idle speed, turn to your
nearest servicing dealer. Do not use the
product until it is correctly adjusted or
repaired.
• 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 turn.
331 - 012 - 25.09.2023 15
1. Turn the idle adjustment screw clockwise until the
cutting attachment starts to turn.
2. Turn the idle adjustment screw counterclockwise
until the cutting attachment stops.
Note: See
Technical data on page 20
for the
recommended idle speed.
To do maintenance on the muffler
WARNING: The muffler is designed
to decrease the noise level and to point
the exhaust gases away from the operator.
The exhaust gases are hot and can contain
sparks, which can cause fire if pointed
against dry and flammable material.
1. Examine if your product has a catalytic converter.
See
Technical data on page 20
.
WARNING:
Mufflers that have
catalytic converters get very hot during
operation and will stay hot for some time
after you stop the product. This also
applies at idle speed. If you touch the
product it can result in burns to the skin.
Think about of the risk of fire!
2. Some mufflers have a special spark arrester screen.
Clean the spark arrester screen with a wire brush
if your product has this type of muffler. Clean the
spark arrester screen weekly on mufflers without a
catalytic converter and on mufflers with a catalytic
converter this must be done monthly. Replace the
spark arrester screen if it is damaged and do not use
a product with a damaged spark arrester screen.
CAUTION: If the spark arrester
screen is frequently blocked it can be
a sign that performance of the catalytic
converter is decreased. Turn to your
servicing dealer to examine the muffler.
A blocked spark arrester screen will
cause overheating and result in damage
to the cylinder and piston.
CAUTION: The spark arrester screen
must be replaced if it is damaged. Do not
use a product if the spark arrester screen on
the muffler is missing or damaged.
To do maintenance on the trimmer
head
1. Only use the recommended cutting attachment and
cutting attachment guard. Refer to
Accessories on
page 21
.
2. Make sure that the cutter on the cutting attachment
guard is not damaged, it cuts the cord to the correct
length.
3. Install the cord as the illustrations on the last pages
of the manual shows.
Cooling system
The product has a cooling system to keep the operation
temperature as low as possible.
Clean the components of the cooling system with a
brush weekly or more frequently in rougher conditions.
A dirty or blocked cooling system makes the product too
hot which causes damage to the piston and cylinder.
The cooling system has the following components:
1. Air intake on the starter.
16
331 - 012 - 25.09.2023
2. Fins on the flywheel.
3. Cooling fins on the cylinder.
4. Cylinder cover (directs cool air over the cylinder).
5. Muffler cover.
6. Muffler plate.
4
2
3
1
6
5
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
Technical data
on page 20
.
• Replace the spark plug if it is necessary.
Air filter
Remove dust and dirt from the air filter to keep it clean
and prevent these problems:
• Carburetor malfunctions.
• Problems when you start the product.
• Loss of engine power.
• Increased wear to engine parts.
• Too much fuel consumption.
To clean the air filter
CAUTION: A air filter that is damaged,
very dirty or soaked with fuel must always be
replaced.
If you use an air filter for a long time it cannot be fully
cleaned. Replace the air filter with a new one at regular
intervals.
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. Make sure
that the air filter is dry before you install it.
4. Replace the air filter if it is too dirty to fully clean it.
Always replace a damaged air filter.
5. Also clean the inner surface of the filter cover. Use
air or a brush.
6. Do a check of the rubber sealing surface. Replace
the filter on the rubber seal if it is damaged.
7. Make sure that the filter is dry before you assemble
it.
To lubricate the bevel gear
1. Remove the cutting equipment.
2. Put the product with the grease plug at its highest
position.
331 - 012 - 25.09.2023
17
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.
Two piece-shaft
Apply grease to the end of the drive shaft after each 30
hours of operation. There is a risk that the drive shaft
ends (splined coupling) on models with two-piece shafts
will seize if they are not lubricated regularly.
Maintenance schedule
The following is a list of the maintenance steps that
must be performed on the product. Most of the items are
described in
Maintenance on page 15
Note: The user must only carry out the maintenance
and service work described in this operator's manual.
More extensive work must be carried out by an
approved service workshop.
Maintenance Daily Weekly Monthly
Clean the external surface. X
Make sure that the throttle trigger lock and the throttle works correctly from a
safety point of view.
X
Do a check of the stop switch to make sure that it works correctly. X
Make sure that the cutting attachment does not rotate at idle speed. X
Clean the air filter. Replace if necessary. X
Examine the cutting attachment guard for damages and cracks. Replace the
guard if it has been exposed to impact or is cracked.
X
Examine the trimmer head for damages and cracks. Replace if 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
18 331 - 012 - 25.09.2023
Maintenance Daily Weekly Monthly
Examine the starter and the starter rope for damages. X
Examine the vibration damping units for damages and cracks. X
Clean the outside of the spark plug. Remove it and do a check of the electrode
gap. Adjust the gap to the correct distance (see,
To examine the spark plug on
page 17
) or replace the spark plug. Make sure that the spark plug is fitted with a
suppressor.
X
Clean the outside of the carburetor and the space around it. X
Do a check of the bevel gear to make sure that it is filled three-quarters with
lubricant. Use special grease to fill if necessary.
X
Clean or replace the spark arrester screen on the muffler (only applies to muf-
flers without a catalytic converter).
X
Do a check of the fuel filter for contamination and the fuel hose for cracks or
other damages. Replace if necessary.
X
Do a check of all cables and connections. X
Do a check of the clutch, clutch springs and the clutch drum for wear. Replace if
necessary. Speak to an approved service workshop.
X
Replace the spark plug. Make sure that the spark plug is fitted with a suppres-
sor.
X
Clean or replace the spark arrester screen on the muffler. Refer to
To do a
check of the muffler on page 8
.
X
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.
331 - 012 - 25.09.2023 19
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, storage and disposal
Transportation and storage
• Store and transport the product and fuel so that
there is no risk that any leakage or fumes comes
in contact with sparks or open flames, for example,
from electrical machinery, electric motors, electrical
relays/switches or boilers.
• When you store and transport fuel always use
approved containers intended for this purpose.
• When you store the product for long periods the
fuel tank must be emptied. Contact your local petrol
station to find out where to dispose excess fuel.
Drain the tank into the appropriate containers and
in a well ventilated area.
• Ensure that the product is cleaned and that a
complete service is carried out before long-term
storage.
• The transport guard must always be fitted to the
cutting attachment when the product is transported
or in storage.
• Secure the product during transport.
• In order to prevent unintentional start of the engine,
the spark plug cap must always be removed during
long-term storage if the product is not under close
supervision and when you perform all service
measures.
• Allow the product to cool before you put in storage.
Disposal
• Obey the local recycling requirements and applicable
regulations.
• Discard all chemicals, such as engine oil or fuel, at a
service center or at an applicable disposal location.
• When the product is no longer in use, send it to
a Husqvarna dealer or discard it at a recycling
location.
Technical data
Technical data
535LK
Engine
Cylinder displacement, cm
3
34.6
Cylinder bore, mm 38
Stroke, mm 30.5
Idle speed, rpm 2900
Recommended max. speed, rpm 11700
Speed of output shaft, rpm 8300
Max. engine output, according to ISO 8893, kW/hp @ rpm 1.5/2.0 @ 8400
Catalytic converter muffler Yes
20 331 - 012 - 25.09.2023
535LK
Speed-regulated ignition system Yes
Ignition system
Spark plug Champion RCJ 6Y
Electrode gap, mm 0.5
Fuel and lubrication system
Fuel tank capacity, litre/cm
3
0.6/600
Weight
Without fuel, cutting attachment and guard, kg 5.8
Noise emissions
1
Sound power level, measured dB (A) 111
Sound power level, guaranteed L
WA
dB (A) 114
Sound levels
2
Equivalent sound pressure level at the operator’s ear, measured according to EN ISO 22868:2011, dB(A), min./
max.:
Equipped with trimmer head (original) 99
Vibration levels
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 4.5/3.9
Accessories
Accessories
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 accessories
Accessory type Cutting attachment guard, art. no.
Blade shaft thread M10
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 guaranteed 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 has a typical statistical dispersion (standard deviation) of 1
dB (A).
331 - 012 - 25.09.2023 21
Approved accessories Accessory type Cutting attachment guard, art. no.
Plastic blades Tricut Ø 255 mm (separate blades have part
number 531 01 77-15)
588 11 79-01
Tricut Ø 300 mm (separate blades have part
number 531 01 77-15)
588 11 79-01
Trimmer head Superauto II (Ø 2,4-2,7 mm cord) 588 11 79-01
588 11 79-01
S35 (Ø 2,4-3,0 mm cord) 588 11 79-01
588 11 79-01
T35, T35x (Ø 2,4-3,0 mm cord) 588 11 79-01
588 11 79-01
Alloy (Ø 2,0-3,3 mm cord) 588 11 79-01
588 11 79-01
Approved attachments Use with
Clean sweep attachment SR600-2 535LK
Hedge trimmer attachment HA110 535LK
Hedge trimmer attachment HA850 535LK
Hedge trimmer attachment HA200 535LK
Hedge trimmer attachment HA860 535LK
Edger attachment EA850 535LK
Saw attachment PA1100 535LK
Trimmer attachment TA850 535LK
Extension attachment EX850 535LK
Cultivator attachment CA230 535LK
Blower attachment BA101 535LK
Bristle brush attachment BR600 535LK
Dethatcher attachment DT600 535LK
Polesaw attachment PAX730 535LK
Polesaw attachment PAX1100 535LK
22 331 - 012 - 25.09.2023
Declaration of Conformity
EU Declaration of Conformity
We, Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel:
+46-36-146500, declare on our sole responsibility that
the product:
Description Grass trimmer
Brand Husqvarna
Type / Model 535LK
Identification Serial numbers dating from 2022 and onwards
complies fully with the following EU directives and
regulations:
Directive / Regulation Description
2006/42/EC "relating to machinery"
2014/30/EU "relating to electromagnetic compatibility"
2000/14/EC "relating to the noise emissions in the environment, Annex V"
2011/65/EU
“on the restriction of the use of certain hazardous substances in electrical and electronic
equipment ”
and that the following standards and/or technical
specifications are applied: EN ISO 12100:2010, EN
IEC 63000:2018, EN ISO 14982:2009, EN ISO
11806-1:2011
SMP Svensk Maskinprovning AB, Box 4053, SE-904
03 Umeå, Sweden has performed a voluntary type
examination according to annex IX of 2006/42/EC.
Certificate number: SEC/18/2489
SMP Svensk Maskinprovning AB, has also verified
agreement with annex V of the council’s directive
2000/14/EC.
Huskvarna, 2023-06-20
Stefan Holmberg, R&D Director, Technology
Management, Husqvarna AB
Responsible for technical documentation
331 - 012 - 25.09.2023 23
UK Declaration of Conformity
We, Husqvarna AB, SE-561 82 Huskvarna, Sweden, tel:
+46-36-146500, declare on our sole responsibility that
the product:
Description Grass trimmer
Brand Husqvarna
Type / Model 535LK
Identification Serial numbers dating from 2022 and onwards
complies fully with the following UK regulations:
Description
The Supply of Machinery (Safety) Regulations 2008
Electromagnetic Compatibility Regulations 2016
The Noise Emission in the Environment by Equipment for use Outdoors Regulations 2001, schedule 8
The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations
2012
and that the following standards and/or technical
specifications are applied: EN ISO 12100:2010, EN
IEC 63000:2018, EN ISO 14982:2009, EN ISO
11806-1:2011.
Huskvarna, 2023-06-20
Stefan Holmberg, R&D Director, Technology
Management, Husqvarna AB
Responsible for technical documentation
UK Importer:
Husqvarna UK Ltd
Preston Road, Co. Durham
DL5 6UP
24 331 - 012 - 25.09.2023
1
3
4
5
2
6
7
8
B
Tri Cut
x 10
A
6 Nm
331 - 012 - 25.09.2023 25
2
1
3 4
5
6
7
8
9
4,0 m
13'
2,4 mm
.095"
~2,0 m
6,5
'
6
"
6
"
15 cm
15 cm
Super Auto II
Super Auto II 1
"
26 331 - 012 - 25.09.2023
9
6 7 8
10
1
S35
1
2
3
4
5
“Click”
331 - 012 - 25.09.2023 27
T35, T35x
"Click"
8,5 m
28'
4,3 m
14'
2,4-2,7 mm
.095-.106"
10 cm
4"
6"
15 cm
1
3
4
5
2
6
7
8
9
28 331 - 012 - 25.09.2023
1
3 4 5
2
331 - 012 - 25.09.2023 29
30 331 - 012 - 25.09.2023
331 - 012 - 25.09.2023 31
www.husqvarna.com
Original instructions
1143746-26
2023-10-05
