Husqvarna 321S15 User manual

Operator’s manual
Manual pengendali
Manual do utilizador
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Hướng dẫn sử dụng
321S15
321S25
Please read the operator´s manual carefully and make sure you understand the instructions before using the machine
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Leia atentamente as instruções do manual do utilizador e certifique-se de que compreende o seu conteúdo antes de utilizar a máquina
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English (2-21)
Bahasa Melayu (22-41)
Portuguese (42-61)
Thai (62-81)
Vietnamese (82-101)

321S15/25
GB-2
KEY TO SYMBOLS
Symbols
Read owner’s manual before
operating this machine.
Wear protective headgear,
protective goggles, ear muffs and
protective mask.
Wear rubber boots.
Wear protective clothing.
Wear rubber gloves.
Electric shock
Hot surface
High pressure injection
Keep a safe distances.
The port to refuel the MIX GASO-
LINE
The direction to close the choke
The direction to open the choke
Primer
Never modify your machine.
We won’t warrant the machine, if you use the
remodeled power sprayer or if you don’t ob-
serve the proper usage written in the manual.

321S15/25
GB-3
Note the following before starting:
Please read the operator’s manual carefully.
Warning labels bearing the mark on the product and in this
Manual refer to important safety matters. Please familiarize
yourself with them and observe them well.
If a warning label on the product becomes soiled or detached,
please order a replacement label from your dealer and attach it
in the requisite place.
PRECAUTIONS
In this Operator’s Manual, precautions that are considered to be
particularly important are indicated as follows.
WARNINGS IN THE MANUAL
WARNING
Failure to observe the precaution may result in the risk of death
or serious injury.
IMPORTANT
Failure to observe the precaution may result in damage or mal-
function of the product.
NOTE
Other additional explanations that may be of use when operat-
ing the product.
Contents
KEY TO SYMBOLS
Symbols.......................................................... 2
CONTENTS
Note the following before starting:.................. 3
INTRODUCTION
Dear Customer, .............................................. 4
WHAT IS WHAT?........................................... 5
SAFETY
For safe operation .......................................... 6
ASSEMBLY
To assemble the sprayer................................ 9
To connect the spray hose assembly
and the pump outlet........................................ 9
To connect the spray hose assembly and
spray rods....................................................... 9
To install and adjust the straps assembly
with the unit .................................................... 9
Checklist before starting the sprayer.............. 9
FUEL
To mix the fuel.............................................. 10
To fuel the unit.............................................. 10
CHEMICAL FILLING
Procedure for !lling ...................................... 11
OPERATION
To start the engine ....................................... 11
To stop the engine........................................ 13
To spray ....................................................... 13
Spraying procedure ...................................... 13
Cleaning after completion of spraying .......... 13
MAINTENANCE
To check the air cleaner ............................... 14
To check the fuel !lter .................................. 14
To check the spark plug ............................... 14
To adjust the engine speed .......................... 14
To check spray nozzle.................................. 15
To check the pump oil level.......................... 15
To check the muf"er..................................... 16
To check the air cooling fan ......................... 16
To replace the gear oil.................................. 16
To check the grease cups ............................ 17
DISPOSAL AND STORAGE
Disposal........................................................ 18
Storage......................................................... 18
TROUBLESHOOTING
TECHNICAL DATA
CONTENTS

321S15/25
GB-4
Dear Customer,
Congratulations on your choice to buy a Husqvarna product! Husqvarna is based on a tradition that dates back to
1689, when the Swedish King Karl XI ordered the construction of a factory on the banks of the Husqvarna River,
for production of muskets. The location was logical, since water power was harnessed from the Huskvarna River to
create the waterpowered plant. During the more than 300 years in existence, the Husqvarna factory has produced
a lot of different products, from wood stoves to modern kitchen appliances, sewing machines, bicycles, motorcycles
etc. In 1956, the "rst motor driven lawn mowers appeared, followed by chain saws in 1959, and it is within this area
Husqvarna is working today.
Today Husqvarna is one of the leading manufacturers in the world of forest and garden products, with quality as our
highest priority. The business concept is to develop, manufacture and market motor-driven products for forestry and
gardening, as well as for the building and construction industry. Husqvarna’s aim is also to be at the front edge for
ergonomics, usability, security and environmental protection. That is the reason why we have developed many dif-
ferent features to add to our products within these areas.
We are convinced that you will appreciate with great satisfaction the quality and performance of our product for a
very long time to come. The purchase of one of our products gives you access to professional help with repairs and
service whenever this may be necessary. If the retailer who sells your machine is not one of our authorised dealers,
ask for the address of your nearest service workshop.
It is our wish that you will be satis"ed with your product and that it will be your companion for a long time. Think of this
operator’s manual as a valuable document. By following its content (usage, service, maintenance, etc), the life span
and the second-hand value of the machine can be extended. If you sell this machine, make sure that the operator’s
manual is passed on to the buyer.
Thank you for using a Husqvarna product.
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.
INTRODUCTION

321S15/25
GB-5
WHAT IS WHAT?
2
4
6
7
18
14
16
35
15
9
12
11
8
13
21
19
20
22
10
17
1
6
1
1
1
01
7
2
100
200
300
400
What is what?
1 Primer 12 Rear handle
2 Air cleaner cover 13 Cock valve
3 Choke lever 14 Pressure regulating dial
4 Fuel tank 15 Drain cap
5 Starter knob 16 Sprayer tank cap
6 Throttle lever 17 Hose assembly
7 Stop switch 18 Spray tank
8 Spark plug 19 OM
9 3-nozzle spray rod 20 Assembly tools
10 Single nozzle spray rod 21 Spare parts
11 Front handle 22 Fuel oil mixing tank

321S15/25
GB-6
For safe operation
Before using this product, please read this Operator’s
Manual thoroughly to ensure correct operation. The fol-
lowing are precautions that should be observed in order
to use the product smoothly. Elsewhere in the Manual,
the warning mark is used to bring your attention to
these precautions.
Before using the product
• This product has been designed mainly for the purpose
of spraying pest control chemicals and weedkillers.
Please do not use it for any other purpose, as this may
cause unforeseen accidents.
• Since this product uses agricultural chemicals that
require careful operation, misuse can be dangerous.
Do not use this product when tired or otherwise in
poor physical condition, or when you may be unable
to judge correctly or operate accurately, such as after
taking cold relief medicines or drinking alcohol. Also,
children or persons who are unable to understand the
contents of this Manual should under no circumstances
be permitted to use the product.
• The engine exhaust gas contains toxic carbon mon-
oxide. Please do not use the product indoors, in vinyl
houses or tunnels, or in other poorly ventilated places.
• Do not use this product in the following cases.
1. When the product could fall over or in other situations
when it is dif!cult to hold or operate.
2. After sunset or at other times when eyesight is poor
and the safety of the spraying area is dif!cult to as-
certain.
3. In worsening weather (rain, fog, strong wind, lightning,
etc.)
• When using for the !rst time, before commencing
actual spraying please receive guidance in operating
the product from a person with adequate experience.
• Fatigue reduces powers of concentration and increas-
es the risk of accidents. When planning work, please
allow ample time, setting a limit of 30-40 minutes for
single spraying sessions and breaks of 10-20 minutes
in between. Also, do not spray for more than 2 hours
in any one day.
• Please take good care of this Operator’s Manual and
refer to it for additional information from time to time.
• When selling or lending this product, it should be ac-
companied by this Operator’s Manual.
WARNING
• Check to see if the shock-absorbing rubber mount
has become cracked or otherwise damaged. Note
that failing to replace this rubber mount when it has
become cracked or damaged may cause the engine to
come loose from its frame during use, thus resulting
in possible serious bodily injury.
• If cracked, be sure to replace without delay.
WARNING
1. If you don’t observe the working time, or working man-
ner, Repetitive Stress Injury (RSI) could occur. If you
feel discomfort, redness and swelling of your !ngers
or any other part of your body, see a doctor before
getting worse.
SAFETY

321S15/25
GB-7
2. To avoid noise complaints, in general, operate product
between 8 a.m. and 5 p.m. on weekdays and 9 a.m.
to 5 p.m. on weekends.
IMPORTANT
Check and follow the local regulations as to sound
level and hours of operations for the product.
Precautions before spraying
• Make sure you have the correct protective clothing,
headgear, rubber gloves and boots, a protective mask,
goggles, a towel, protective cream, etc., to prevent
chemicals from coming into contact with your skin or
entering your lungs. When spraying, please wear this
protective gear to prevent any risk of injury.
• Please store chemicals in a locked storage box, locker,
or other safe place out of the reach of children.
• Carefully read the instructions for using the chemicals,
and familiarize yourself with the level of toxicity, method
of use, etc.
• Please pay all due consideration to the area in which
you will be spraying, to ensure that you do not pollute
the water supply, rivers, lakes, ponds, etc., or cause
any damage to residents, passers-by, livestock, etc.
• Prepare yourself physically on the day before spraying,
by for example cutting down on alcoholic beverages
or late-night work.
Do not allow children, animals, etc., to enter the chemical
spraying area.
• Before spraying, please prepare fully by inspecting
sprayer nozzles and checking for abnormalities such
as loose screws or spray hose connections, fuel leaks,
defective or broken !uid gaskets, or damage to the
carrying band.
1. Protective headgear
2. Protective goggles
3. Protective mask
4. Rubber boots
5. Ear muffs
6. Neck covering
7. Protective clothing
8. Rubber gloves
9. Protective clothing
Precautions when transporting chemicals
• When transporting chemicals, please handle with care
to ensure that there is no spillage of chemicals from
torn bags, broken bottles, or loose stoppers.
• Do not carry chemicals in the same container as food.
Precautions when transporting the sprayer
• Do not transport the sprayer while it has chemicals or
fuel in the tank, as these could leak out as a result of
impact during transportation.
• When transporting in a vehicle, please use a rope or
similar to "x the sprayer "rmly to the cargo trailer in
an upright position. Please do not transport by bicycle
or motorbike, as this is dangerous.
Precautions concerning fuel
WARNING
Taking the following precautions, will lessen the risk
of !re:
• Mix and pour fuel outdoors, where there are no sparks
or !ames.
• Do not smoke or place hot objects near fuel.
• Always shut off the engine before refuelling.
• Always stop the engine and let it cool for a few minutes
before refuelling.
• When refuelling, open the fuel cap slowly so that any
excess pressure is released gently.
• Tighten the fuel cap carefully after refuelling.
• Always move the machine away from the refuelling
area and source before starting.
• Always use a fuel container with an anti-spill valve.
• If you have spilled fuel on it. Wipe off the spillage and
allow remaining fuel to evaporate.
• Clean the area around the fuel cap. Contamination in
the tank can cause operating problems.
• Ensure that the fuel is well mixed by shaking the con-
tainer before "lling the tank.
Precautions when re!lling chemicals
• Before "lling the tank with chemicals, please make
sure that the cock valve is completely at rest.
• After chemical re"lling, "rmly tighten the tank cap. If
not fully tightened the cap may become loose during
spraying, with the risk of physical exposure to the
chemicals.
Precaution when starting the engine
• Please keep children, animals, etc. well away when
starting the engine and spraying.
Precautions when spraying
• Since protective clothing generally offers poor ventila-
tion and thus places stress on the body, there is a risk
of contracting heatstroke or other illness when operat-
ing for long periods under high temperatures. Please
avoid spraying on hot days, aiming instead for early
morning and late afternoon times when temperatures
are relatively cool and winds are low.

321S15/25
GB-8
• When starting work, please pay all due consideration
to the spraying time, wind direction, etc., to ensure that
no noise disturbance or chemical hazard is caused to
nearby residents, passers-by, farm crops, and so on.
• While spraying please hold the grip •rmly at all times
and be careful not to point the nozzle in the direction
of people or animals.
• While spraying please be careful of the wind direction
and always stand on the upwind side, to avoid spraying
yourself with chemicals.
• Should you begin to feel even slightly unwell while
spraying, consult a doctor immediately. When doing
so, inform the doctor of the name of the chemical you
were using, the conditions of use, etc.
• If the sprayer is tilted the chemical may leak out
through the air holes in the cap. When spraying always
make sure you have a •rm footing and maintain your
balance.
• Do not touch the spark plug or plug cords while the
engine is running, as you may get an electric shock.
• Do not touch the muf!er, spark plug, or other metal
parts with your bare hands while the engine is running
or immediately after stopping the engine, as there is
the risk of burns due to high temperatures.
Precautions after spraying
• Please seal unused chemicals and store them out of
the reach of children.
• Do not simply discard empty chemical containers,
but dispose of them safely by incinerating, burying, or
another similar method. In addition, please take every
care that the water used to clean spraying tools does
not create any hazard.
• Fully inspect and maintain protective clothing, masks,
gloves, and other protective gear in preparation for
the next session.
• After completing the work and tidying away chemicals
and spraying tools, you should immediately take a bath
or wash your hands, feet, face, etc. thoroughly with
soap, as well as washing your mouth out.
• You should change all clothes worn, including under-
wear, and wash them thoroughly. Clothes worn during
spraying should not be worn again the following day.
• After spraying, please limit your alcohol intake and
rest thoroughly by going to bed early. If you feel even
slightly unwell, please see a doctor as soon as pos-
sible.
Other precautions
• When engaged in spraying work over a protracted pe-
riod of time, please have your health checked regularly.
• Please carry out spraying in a planned fashion, keep-
ing a daily record of the date and time of spraying, the
chemicals used, the target pest, contents of the work,
duration of the work, and other details.
• Please keep the following points in mind when select-
ing or using protective gear.
A. Protective clothing. Choose clothing that is cool to
wear and offers good ventilation and waterproo•ng.
In addition, wear items that enable you to carry out
spraying work in total comfort and safety.
B. Spraying hood. Use a hood with a brim that is water-
proof and covers your neck and shoulders.
C. Gloves. Use gloves that are dif•cult for chemicals to
penetrate and do not slip even if you perspire while
doing the work.
D. Rubber apron. When mixing chemicals, wear a long,
thick, and wide apron that cannot be penetrated by
chemical splashes.
E. Protective goggles, mask, etc. Select suitable protec-
tive goggles, mask, rubber boots, eye washer, and
protective cream, etc., paying attention to standards
and the recommendations of farm work safety promo-
tion organizations.
Maintenance precautions
• In order to maintain the functions of the product,
regularly carry out the maintenance inspections listed
in this Manual. When maintenance or parts replace-
ment not indicated in this Manual are required, please
consult your product supplier or nearest Husqvarna
product dealer.
• Never keep the engine running while carrying out
inspections or maintenance.
• Do not modify the sprayer or dismantle the engine.
This could lead to breakdown and serious accidents
during operation.
• Do not touch the muf!er or spark plug with your bare
hands immediately after stopping the engine. There is
the risk of burns due to high temperature.
• For replacement parts, please use original Husqvarna
parts or brands designated by Husqvarna .
Maintenance of labels
1. Please keep warning labels clean and unmarked.
2. If warning labels become soiled or peel off, please
order from your supplier and replace with new ones.
3. When af•xing new labels please wipe off all dirt and
moisture.

321S15/25
GB-9
To assemble the sprayer
1. Connect the spray hose assembly and the pump outlet.
2. Connect the spray hose assembly and spray rods.
3. Install and adjust the straps assembly with the unit.
To connect the spray hose assembly and the pump
outlet
1. Attach the spray hose to the pump outlet (1) by
tighening the wing nut (2). Tighten by hand only as
overtightening may damage hose !ttings.
1
2
To connect the spray hose assembly and spray rods
1. For 3-nozzle spray rod: Screw the extension rod (4)
onto the cock valve (3). Screw the 3-nozzle spray rod
(5) onto the extension rod (4). Ensure all connections
are secured. Tighten by hand only.
2. For single nozzle wand: Screw the single nozzle wand
(6) onto the cock valve (3). Ensure the connection is
secured. The single wand is equipped with the "ow
adjustment. Tighten by hand only.
NOTE
• If there is a leakage from the single nozzle wand (6)
!ttings, retighten the !ttings with a spanner or multigrip.
3. After the spray hose assembly is connected with the
spray rod, inspect and ensure all connections in the
spray hose assembly such as the seals (7), cock valve
(8), handle (9), spray hose (10) and rear handle (11)
are tighly secured (hand tighten only).
NOTE
• Use rear handle (11) to adjust spray volume and spray
distance.
ASSEMBLY
3
3
4
7
5
6
11
7
8
8
9
10 10
To install and adjust the straps assembly with the unit
1. Hook the harness clip (12) into the fastening eyelet
(14).
2. Slip the hardness strap (13) over your shoulder.
3. Adjust the length of the strap for comfortable and bal-
anced position.
14
14
12
13
NOTE
• Choose a different fastening eyelet (14), according to
your height. Adjust to the most comfortable position.
Checklist before starting the sprayer
Review the unit’s assembly to ensure you have performed
all of the following:
1. Be sure to read Operator Safety and Operation before
using the sprayer.
2. Check for properly tightened hose connections and
other connections including the spray hose assembly.
3. Check to make sure there are no kinks, cuts, or dam-
age to hoses.
WARNING
• Spray hose assembly and !ttings are important for
safety of the appliance. Use only hoses and !ttings
recommended by the manufacturer.

321S15/25
GB-10
WARNING
• Gasoline is very !ammable. Avoid smoking or
bringing any !ame or sparks near fuel. Make sure
to stop the engine and allow it cool before refueling
the unit. Select outdoor bare ground for fueling
and move at least 3 m (10 ft) away from the fueling
point before starting the engine.
• The Husqvarna engines are lubricated by oil specially
formulated for air-cooled 2-cycle gasoline engine use.
If Husqvarna oil is not available, use an anti-oxidant
added quality oil expressly labeled for air-cooled
2-cycle engine use (JASO FC GRADE OIL or ISO
EGC GRADE).
• Do not use BIA or TCW (2-stroke water-cooling type)
mixed oil.
• RECOMMENDED MIXING RATIO:
A. GASOLINE 40 : OIL 1 (when using Husqvarna
genuine oil)
B. GASOLINE 25 : OIL 1 (when using other oil)
• These engines are certi!ed to operate on unleaded
gasoline.
• Make sure to use gasoline with a minimum octane
number of 89RON (USA/Canada: 87AL).
• Gasoline with up to 10% ethanol (gasohol) or up to
15% MTBE (methyl tertiary butyl ether) is acceptable.
• If you use a gasoline of a lower octane value than pre-
scribed, there is a danger that the engine temperature
may rise and an engine problem such as piston seizing
may consequently occur.
• Clean, fresh and unleaded gasoline is recommended
to reduce the contamination of the air for the sake of
your health and the environment.
• Poor quality gasolines or oils may damage sealing
rings, fuel lines or fuel tank of the engine.
To mix the fuel
WARNING
• Pay attention to agitation.
1. Measure out the quantities of gasoline and oil to be
mixed.
2. Put some of the gasoline into a clean, approved fuel
container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of gasoline and agitate again for at least
one minute. As some oils may be dif!cult to agitate
depending on oil ingredients, suf!cient agitation is nec-
essary for the engine to last long. Be careful that, if the
agitation is insuf!cient, there is an increased danger
of early piston seizing due to abnormally lean mixture.
5. Put a clear indication on the outside of the container
to avoid mixing up with gasoline or other containers.
6. Indicate the contents on outside of container for easy
identi!cation.
To fuel the unit
1. Untwist and remove the fuel cap. Rest the cap on a
dustless place.
2. Put fuel into the fuel tank to 80% of the full capacity.
3. Fasten the fuel cap securely and wipe up any fuel
spillage around the unit.
WARNING
1. Select bare ground for fueling.
2. Move at least 3 meters (10 feet ) away from the fueling
point before starting the engine.
3. Stop the engine before refueling the unit. At that time,
be sure to suf!ciently agitate the mixed gasoline in
the container.
FOR YOUR ENGINE LIFE, AVOID:
1. FUEL WITH NO OIL (RAW GASOLINE) It will cause
severe damage to the internal engine parts very
quickly.
2. GASOHOL - It can cause deterioration of rubber and/
or plastic parts and disruption of engine lubrication.
3. OIL FOR 4-CYCLE ENGINE USE It can cause spark
plug fouling, exhaust port blocking, or piston ring
sticking.
4. Mixed fuels which have been left unused for a period of
one month or more may clog the carburetor and result
in the engine failing to operate properly.
5. In the case of storing the product for a long period of
time, clean the fuel tank after rendering it empty. Next,
activate the engine and empty the carburetor of the
composite fuel.
6. In the case of scrapping the used mixed oil container,
scrap it only at an authorized repository site.
NOTE
• As for details of quality assurance, read the description
in the section Limited Warranty carefully. Moreover,
normal wear and change in product with no functional
in"uence are not covered by the warranty. Also, be
careful that, if the usage in the instruction manual is
not observed as to the mixed gasoline, etc. described
therein, it may not be covered by the warranty.
FUEL

321S15/25
GB-11
WARNING
• Highly combustible. When refueling, switch the
engine off and keep well away from naked !ames.
• After "lling the tank (2) with fuel, "rmly tighten
the cap (1).
1
2
To start the engine
WARNING
• Before starting the engine, make sure that the cock
valve (3) is completely returned. Starting with the cock
valve still pulled out is dangerous, as chemical !uid
may spray out of the nozzle as soon as the engine
is started.
OPERATION
3
• To start the engine, place the sprayer on an even and
stable surface or platform. If the sprayer is unstable,
the reaction on starting etc. may cause it to fall.
IMPORTANT
• Do not allow the chemical !uid or water in the tank to
run out while the engine is running. If the engine runs
empty it may cause breakage of the spray pump.
• Make sure that the gear oil is "lled until the middle of
the check-window (5). If it is not enough, loose the
upper bolt (4) and "ll the gear oil. (SAE40CC)
4
5
CHEMICAL FILLING
WARNING
• Chemical substances should be handled correctly,
observing the precautions marked on the container.
Some chemicals are extremely hazardous to humans
and animals, and handling errors can cause serious
poisoning or even fatal accidents.
• When not in use, chemical substance containers
should be stored separately from other containers out
of the reach of children.
IMPORTANT
• Do not "ll the sprayer tank with undiluted !uid. This
could cause the gasket and valves to lose their du-
rability.
• Do not "ll the sprayer tank with coarse particle !uid
like bordeaux mixture or lime sulphur. This will shorten
the service life of the machine.
Procedure for "lling
1. Use a bucket or other suitable container and dilute the
chemical to the requisite strength.
2. Place the sprayer on an even and stable surface and
remove the sprayer tank cap.
3. Fill the tank by passing chemical through the strainer
(a).
4. When "lling is complete, "rmly tighten the cap.

321S15/25
GB-12
1. Press the primer (6) at the bottom of the carburetor a
few times with your •nger until the fuel starts to •ow
through the transparent pipe.
6
NOTE
• There is no need to operate the primer when restarting
immediately after stopping the engine, provided there
is fuel left in the fuel tank.
2. Lift the choke lever (7) on the right of the air cleaner
until it is in the “closed” position.
7
NOTE
• When restarting immediately after stopping the engine,
set the choke lever to “open”.
3. Set the pressure regulating dial (8) to appropriate spray
conditions. The pressure regulating dial is used to
control the amount of pressure the pump will produce.
When set, excess pressure is vented back into the
tank supply to ensure a maximum output pressure at
the wand. To set the pressure, follows these steps:
• Turn in clockwise direction to increase the pressure,
or; Turn in anticlockwise direction to decrease the
pressure.
• To lock the pressure regulating dial, tighten the pres-
sure locking plate (9) in clockwise direction.
8
9
IMPORTANT
• Pressure has been set properly before delivery, do not
change the pressure unless it is required.
4. Place the sprayer in a stable location, and pull the
starter knob with the right hand while holding the
sprayer tank down with the left hand. The starter knob
should •rst be pulled out lightly, then, when resistance
is felt, pulled more swiftly and vigorously.
IMPORTANT
• Do not pull the rope out completely or release the
starter knob so that the rope returns, as this can cause
starter malfunction.
5. Once the engine has started, gradually open the choke
lever (7), warm up at low speed for 1-2 minutes.
7

321S15/25
GB-13
IMPORTANT
• If the rope is pulled continuously with the choke closed,
the spark plug may become !ooded and the engine
may fail to start. If so, you should "rst remove the
spark plug and dry the electrodes, then repeat the
starting procedure.
To stop the engine
WARNING
• Stop the engine immediately in the event of an emer-
gency.
1. Lower the throttle lever (12) fully and cool the engine
down for 1-2 minutes at low speed.
2. Hold down stop switch (11) on the left side of the spray-
er frame until the engine has come to a complete stop.
11
12
IMPORTANT
• Except for an emergency, avoid stopping the engine
while pulling the throttle trigger.
To spray
WARNING
• Please use correctly, observing the precautions in
this manual.
• Before lifting the sprayer onto your back, check that the
sprayer tank cap and fuel tank cap are tightly closed.
• When spraying, do not point the nozzle at your face,
or at other people, animals, etc.
• If the sprayer is tilted too much, chemical !uid or fuel
may leak out through the air holes in the cap. When
using, always try to maintain an upright posture.
IMPORTANT
• If the sprayer tank becomes empty while spraying,
reduce the engine to low speed immediately. Empty
running of the engine may cause the spray pump to
break.
• Please avoid using multiple nozzles, jet nozzles,
or other nozzles that give a large spray volume, as
spraying ef"ciency is sometimes impaired owing to
insuf"cient pressure.
Spraying procedure
1. Start the engine,
2. Lift the sprayer onto your back.
3. Adjust the carrying band to a suitable length for car-
rying.
4. Increase the engine speed,
5. Open the cock valve (3). Chemical !uid starts to spray
out from the nozzle in the form of mist.
6. When stopping work, close the cock valve (3) fully and
reduce the engine speed.
b
b
a
3
a. open
b. close
Cleaning after completion of spraying
1. Loosen the !uid drain cap , transfer the chemical !uid
left inside the tank into a suitable container, and pro-
cess appropriately with all due consideration to safety.
2. Pour about 5 litres of clean water into the sprayer tank,
spray through the nozzle for 2-3 minutes, and drain
the water left inside the tank.

321S15/25
GB-14
MAINTENANCE
WARNING
• Make sure that the engine has stopped and is cool
before performing any service to the machine. Contact
with hot muf!er may result in a personal injury.
• Do not modify the sprayer or dismantle the engine.
• When replacing parts please use Husqvarna original
parts or designated parts.
To check the air cleaner
• After every 25 hours of operation, please remove the
air cleaner cover (1) and inspect the air cleaner (2). If
it is too dirty, wash it carefully in warm water containing
a neutral detergent, and return it to its original position
after drying it thoroughly.
• If the air cleaner (2) is distorted or damaged, please
replace it with a new one.
21
IMPORTANT
• If the air cleaner is blocked, the ef"ciency of the en-
gine will be reduced. In addition, the engine interior
will suffer abnormal wear if operated without the "lter
or if continually operated with a distorted or damaged
"lter "tted.
To check the fuel !lter
• After every 25 hours of operation, empty the fuel tank,
detach the fuel "lter (3) from the tank, and remove all
dirt. If the "lter is too clogged, please replace it with
a new one.
3
IMPORTANT
• If the fuel "lter is clogged, the engine speed may be
limited or speed !uctuations may occur.
• If the engine is operated without a fuel "lter, dirt will ac-
cumulate in the carburetor and cause it to malfunction.
To check the spark plug
WARNING
• Do not touch the spark plug with your bare hands im-
mediately after operation, as there is the risk of burns
due to high temperature.
• After every 25 hours of operation, detach the spark
plug and remove dirt from the electrodes with a wire
brush or similar.
• The correct electrode gap is 0.6 to 0.7mm.
• When replacing plugs, please use designated items.
0.6~0.7mm
IMPORTANT
• If too much fuel is absorbed or poor quality oil is used,
the spark plug electrodes become dirty, making the
engine harder to start.
• Note that using any spark plug other than those
designated may result in the engine failing to operate
properly or in the engine becoming overheated and
damaged.
• To install the spark plug, "rst turn the plug until it is
"nger tight, then tighten it a quarter turn more with a
socket wrench.
TIGHTENING TORQUE: 14.7 to 21.6 N.m.
(150 to 220 kgf-cm)
To adjust the engine speed
• Although the engine is adjusted on leaving the factory,
after repeated use it may sometimes require readjust-
ment or maintenance. Please consult your original
supplier regarding inspections and maintenance other
than those shown below.

321S15/25
GB-15
To check spray nozzle
A clogged spray nozzle can cause the spray pressure
and !owrate to drop. All excessive pressure will go back
to the sprayer tank.
To correct the problem, immediately clean the spray tip by
following these instructions:
1. Stop engine & remove the unit from the operators back.
2. Disconnect the spray rod from the spray hose as-
sembly.
3. To remove the nozzle cap (7/9), turn in anticlockwise
direction.
4. Inspect and clean the spray tip (8/10) and metal
strainer (11) for 3-nozzle spray rod from any foreign
material clogging or restricting the spray nozzle. Re-
place if damaged.
5. Reinstall the nozzle cap and the spray rod with the
spray hose assembly tighly (hand tighten) .
78
Single nozzle spray rod
9
10
11
3-nozzle spray rod
To check the pump oil level
Oil level should be checked prior to each use.
1. Make sure the sprayer is on a level surface.
2. To get access to the back of the pump, you need to
unbutton the top backpad only.
3. Verify the oil is showing as 1/3-1/2’s full (approx.
100ml) in the oil glass window.
4. Replace and re-button the backpad into place before
using.
NOTE
• DO NOT attempt any oil maintenance on this pump.
• The pump is pre-lubricated and sealed from the fac-
tory. If re"lling is required, see an Authorized Dealer
or Service Centre.
To adjust idling speed
• If the engine stalls or the pump continues to move
when in idling position with the throttle lever completely
lowered, readjust the engine speed using the idle
speed adjuster (4) on the left of the carburetor.
4
c
d
c. reduce speed
d. increase speed
Turn the idling adjustment screw:
• Counter-clockwise to reduce engine speed
• Clockwise to increase engine speed
NOTE
• Warm up the engine before adjusting the idling speed.
To adjust the throttle wire play
• Throttle wire play should be 1 to 2 mm.
• Take the throttle wire at the carburetor end in your
"ngers and give a light tug, after completely returning
the throttle lever,
• Readjust the position of the wire retaining nut (6), if
the play is too great or too small.
• Loosen the lock nut (5) and turn the wire retaining
nut (6) clockwise (screw in) to increase the play and
counter-clockwise (unscrew) to reduce it.
• Fasten the wire retaining nut by tightening the lock nut
, after adjusting.
5
6
1~2mm

321S15/25
GB-16
To check the muf•er
WARNING
• Inspect periodically, the muf•er for loose fas-
teners, any damage or corrosion. If any sign of
exhaust leakage is found, stop using the machine
and have it repaired immediately.
• Note that failing to do so may result in the engine
catching on !re.
Perform the procedures after every 100 hours of operation
1. Remove the muf!er, insert a screwdriver into the vent,
and wipe away any carbon buildup. Wipe away any
carbon buildup on the muf!er exhaust vent and cylinder
exhaust port at the same time.
2. Tighten all screws, bolts, and "ttings.
3. Check to see if any oil or grease has worked its way in
between the clutch lining and drum, and if it has, wipe
it away using oil-free, lead-free gasoline.
To check the air cooling fan
WARNING
• Never touch the cylinder, muf•er, or spark plug
with your bare hands immediately after stopping
the engine. The engine can b ecome very hot
when in operation, and doing so could result in
severe burns.
• When checking the machine to make sure that
it is okay before using it, check the area around
the muf•er and remove any wood chips or leaves
which have attached themselves to the brushcut-
ter. Failing to do so could cause the muf•er to
become overheated and that in turn could cause
the engine to catch on !re. Always make sure that
the muf•er is clean and free of wood chips, leaves,
and other waste before use.
• Check the intake air cooling vent and the area
around the cylinder cooling !ns after every 25
hours of use for blockage. Note that it is neces-
sary to remove the upper cover and the lower
cover in order to be able to view the upper part of
the cylinder.
IMPORTANT
• If waste gets stuck and causes blockage around the
intake air cooling vent (12) or between the cylinder
"ns, it may cause the engine to overheat, and that in
turn may cause mechanical failure on the part of the
brushcutter.
12
To replace the gear oil
• After "rst 25 hours of use, replace the gear oil. After
that, replace it after every 100 hours of use (SAE90,
100cc).
13
14
15
(13) Upper bolt
(14) Check-window
(15) Drain bolt

321S15/25
GB-17
Maintenance procedure Daily Weekly Monthly Note
Overall
Inspect the whole unit for damage,
leak or spillage √
Inspect all accessible fasteners √Tighten or replace
if necessary
Inspect all screws/nuts/bolts √
Tighten or replace
if necessary. Ad-
justing screws are
not included.
Check the hoses and !ttings √
Clean for any debris √
Engine
Inspect and clean the fuel tank √
Inspect and clean the fuel !lter √
Inspect and clean the air cleaner √
Check the operation of the throttle
lever and stop switch. √
Empty the fuel tank √
Apply grease to the plunger √
Clean or re-adjust the spark plug gap √
Make sure the
gap is 0.6 to 0.7m
(.025in). Replace
if necessary
Inspect the muf"er for damage. √Replace if neces-
sary
Clean the muf"er and the cylinder
exhaust port √
Clean the cylinder !ns and intake air
cooling fan √
To check the grease cups
• Open the upper cap (16) of the grease cup and check
the grease amount. Fill it up if it is decreasing.
16

321S15/25
GB-18
Disposal
When disposing your machine, fuel or oil for the machine,
be sure to allow your local regulations.
Storage
WARNING
• When draining fuel, please be careful not to spill it. If
fuel is spilt, wipe off thoroughly. In addition, please be
sure to close the storage container cap tightly.
IMPORTANT
• If fuel is left in the engine for protracted periods, the
inside of the carburetor may become clogged and
cause engine malfunction (faulty starting and insuf-
!cient output).
• During storage, slightly loosen the cap of the chemi-
cal "uid tank. If screwed too tightly, the gasket may
become distorted.
On completion of all work procedures, when not planning
to use again for a protracted period please carry out the
following pre-storage care, to prevent trouble caused by
time-lapse changes.
DISPOSAL AND STORAGE
1. Clean the chemical "uid tank and nozzle (see page 13).
2. Remove dirt from the sprayer, inspect it for any dam-
age or looseness, and, if any abnormality is found,
correct it thoroughly in preparation for the next time
you use the unit.
3. Drain the fuel tank.
4. Start the engine, and leave it in idling condition until all
the fuel inside the carburetor is spent and the engine
comes to a natural stop.
5. Remove the spark plug and put a few drops (1 to 2 cc)
of 2-cycle oil inside the engine. After pulling the starter
rope 2 or 3 times, return the spark plug to their original
position and stop in compressed position.
6. After oiling the throttle lever and other metal parts with
anti-corrosive oil, cover the sprayer and store indoors
in a low-humidity location.
Maintenance procedure Daily Weekly Monthly Note
Sprayer tank and spray nozzels
Check/clean the sprayer tank strainer #
Clean if clogged.
Replace if dam-
aged or torn.
Empty and clean the sprayer tank #
Check the spray nozzles #
Pump
Check the level of the pump oil #
Replace the gear oil #
Check the grease cups # Re!ll if necessary

321S15/25
GB-19
Problem Possible causes Remedy
Engine will not start
Electrode spark plug is wet or
fouled Clean or replace the spark plug
Cracked spark plug insulator Replace the spark plug
Incorrect spark plug gap Adjust gap 0.6 - 0.7mm
Engine !ooded
Crank engine with choke open and full throt-
tle to clear excess
fuel
Incorrect or stale fuel Drain and replace with correct fuel/oil mixture
No fuel in tank Refuel with correct fuel/oil mixture
Insuf"cient power
Clogged air cleaner Clean and lubricate air cleaner
Fuel line/passage clogged Contact Service Centre or see Authorized
Dealer
Carbon build up in muf!er Contact Service Centre or see Authorized
Dealer
Use incorrect or stale fuel Drain and replace with correct fuel/oil mixture
Piston seizure Contact Service Centre or see Authorized
Dealer
Machine is overworked Operate properly - do not overload
Engine stops during opera-
tion
Switch is bumped Restart the engine
Shorting of spark plug Clean spark plug or replace
Piston scored Contact Service Centre or see Authorized
Dealer
Fuel tank is empty Refuel with correct fuel/oil mixture
Carburettor or fuel tank clogged Contact Service Centre or see Authorized
Dealer
Engine is dif"cult to stop
Stop wire disconnected from the
switch Attach stop wire to switch
Overheated engin Contact service centre or see Authorized
Dealer
Unit main body
Loose engine and/or pump
mounts Retignten engine and/or pump mount screws
Tank leak Contact service centre or see Authorized
Dealer
Leak at the tube connections Retignten the hose clip or replace if dam-
aged
Pump is no spraying
No chemical diluted liquid in the
sprayer tank Fill the sprayer tank
Valves inside the pump clogged Contact Service Centre or see Authorized
Dealer
Cock valve blocked Clean the cock valve or replace
Incorrect pressure setting-too low Adjust the pressure regulating dial
Pump is worn out or damaged Contact Service Centre or see Authorized
Dealer
Spray rod nozzle clogged Clean the nozzle
TROUBLESHOOTING

Problem Possible causes Remedy
Insuf•cient spray pressure
Pump speed or pressure setting
too low
Adjust the pump speed and pressure regulat-
ing dial
Spray rod nozzle clogged Clean the nozzle
Pump seals and/or vee-packing
seals worn or damaged
Contact Service Centre or see Authorized
Dealer
One way valve(s) inside the pump
clogged
Contact Service Centre or see Authorized
Dealer
Clutch slipping Replace the clutch
Lack of lubrication Apply grease onto the plunger
Burst spray hose Contact Service Centre or see Authorized
Dealer
Spray rod nozzle worn or dam-
aged
Contact Service Centre or see Authorized
Dealer
If running dif•culties continue, contact your closest Authorized Dealer or Service Centre.