STIHL SR 430, 450
WARNING
Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.
Instruction Manual
Manual de instrucciones
Instruction Manual
1 - 48
Manual de instrucciones
49 - 99
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Assembling the Unit 15
Adjusting the Throttle Cable 18
Harness 18
Fuel 19
Fueling 20
Original Instruction ManualPrinted on chlorine-free paper
Information Before You Start 22
Starting / Stopping the Engine 22
Operating Instructions 25
Calculating Required Quantity of
Solution 25
Metering Unit 26
Dusting and Spreading Mode 29
Filling the Container 31
Working 32
After Finishing Work 33
Storing the Machine 34
Engine Management 34
Replacing the Air Filter 35
Adjusting the Carburetor 35
Printing inks contain vegetable oils, paper can be recycled.
Spark Plug 36
Engine Running Behavior 37
Inspections and Maintenance by
Dealer 38
Maintenance and Care 39
Main Parts 41
Specifications 43
Maintenance and Repairs 44
Disposal 44
Limited Warranty 44
STIHL Incorporated Federal
Emission Control Warranty
Statement 45
Trademarks 47
Allow only persons who fully understand
this manual to operate your mistblower.
To receive maximum performance and
satisfaction from your STIHL
mistblower, it is important that you read,
understand and follow the safety
precautions and the operating and
maintenance instructions in chapter
"Safety Precautions and Working
Techniques" before using your
mistblower. For further information you
can go to www.stihlusa.com.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
WARNING
Because a mistblower is a power tool for
spraying chemicals, some special safety
precautions must be observed as with
any other power tool to reduce the risk of
personal injury. Careless or improper
use may cause serious or even fatal
injury.
© ANDREAS STIHL AG & Co. KG, 2020
0458-454-8621-H. VA3.L20.
0000006507_007_GB
SR 430, SR 450
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
Pictograms
The meanings of the pictograms
attached to or embossed on the
machine are explained in this manual.
Depending on the model concerned, the
following pictograms may be on your
machine.
Fuel tank for gasoline
and engine oil mixture
Press to operate manual
fuel pump
Dusting and spreading
dry mode
Flow control
Mistblowing wet mode
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. For example:
N Remove the screw (1)
N Pull the spark arresting screen (2)
upwards out of the muffler
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are indicated with the
symbols and signal words described
below:
DANGER
Indicates a hazardous situation that, if
not avoided, will result in death or
serious injury.
WARNING
Indicates a hazardous situation that, if
not avoided, could result in death or
serious injury.
NOTICE
Indicates a risk of property damage,
including damage to the machine or its
individual components.
described in this manual, please contact
your STIHL dealer or the STIHL
distributor for your area for assistance.
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be shown
in different ways:
N A bullet indicates a step or
procedure.
2
Engineering Improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differs from those
SR 430, SR 450
English
Safety Precautions and
Working Techniques
Because the mistblower
is a power tool for spraying chemicals, special
safety precautions must
be observed to reduce
the risk of personal injury.
It is important that you
read, fully understand
and observe the following
general safety precautions and warnings. Read
the instruction manual
and the safety precautions periodically. In
addition, read and follow
the chemical manufacturer’s instructions for the
chemical products being
applied. Since such products may vary greatly in
handling/application
requirements and risks,
the product label is normally your best guide for
safe and effective use.
Use your power tool for spraying
chemicals and other liquids to control
pests and weeds in fruit, flower and
vegetable gardens, on trees and bushes
and on other plants, such as coffee,
tobacco and cotton. It is also useful in
the maintenance of young trees for, e.g.,
controlling the bark beetle and other
pests and plant diseases.
Only use plant protection products that
are specifically approved for use in
sprayers/mistblowers by their
manufacturer and that meet all
applicable safety regulations, standards
and ordinances.
WARNING
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
All operating and servicing personnel
should be trained and familiarized with
the proper handling procedures for the
chemical products being used, as well
as with first aid/emergency care, and
liquid and dry chemical disposal
regulations.
WARNING
Your power tool is for professional use
only. Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this instruction
manual.
WARNING
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
WARNING
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
Most of these safety precautions and
warnings apply to the use of all STIHL
mistblowers. Different models may have
different parts and controls. See the
appropriate section in this instruction
manual for a description of the controls
and the function of the parts of your
model.
Safe use of a mistblower involves
1. the operator
2. the power tool
3. the handling of the chemicals to be
sprayed.
4. the use of the power tool
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate
this machine when you are fatigued.
WARNING
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
this machine.
SR 430, SR 450
3
English
WARNING
Prolonged use of a power tool (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud's phenomenon) or
carpal tunnel syndrome.
These conditions reduce the hand's
ability to feel and regulate temperature,
produce numbness and burning
sensations and may cause nerve and
circulation damage and tissue necrosis.
All factors which contribute to
whitefinger disease are not known, but
cold weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
Most STIHL power tools are available
with an anti-vibration ("AV") system
designed to reduce the transmission of
vibrations created by the machine to the
operator's hands. An AV system is
recommended for those persons using
power tools on a regular or sustained
basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A power tool with loose
components or with damaged or
worn AV elements will tend to have
higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure. Take
frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should closely monitor the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
Proper Clothing
WARNING
To reduce the risk of injury when
working with chemical agents, the
operator should wear proper protective
apparel when filling, using and cleaning
the power tool. Always follow all of the
chemical manufacturer’s instructions
with respect to proper eye, skin and
respiratory protection. They may differ
from and exceed the following
precautions.
WARNING
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with a pacemaker should
consult their physician and the
pacemaker manufacturer before
operating this tool.
4
SR 430, SR 450
English
WARNING
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protective glasses with
adequate top and side
protection complying with
ANSI Z87 "+".
Power tool noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their
hearing checked
regularly.
Be particularly alert and
cautious when wearing
hearing protection
because your ability to
hear warnings (shouts,
alarms, etc.) is restricted.
When working with toxic
chemicals, the operator
and any bystanders may
need to wear a properly
fitted respirator approved
by NIOSH/MSHA for the
chemical being used.
Consult the product label.
Breathing toxic chemicals
can cause serious or fatal
injury.
Always wear rubber/chemical-resistent
gloves when handling
this power tool.
For some chemicals it is
advisable to wear impermeable coveralls or an
impermeable work apron.
Check the product label.
If you are spraying overhead or if the spray may
reach head height, wear
a wide brim hat or other
suitable head covering.
Do not wear shorts, sandals or go barefoot.
Wear rubber/chemicalresistent boots.
Avoid loose-fitting jackets, scarfs, neckties,
jewelry, flared or cuffed
pants, unconfined long
hair or anything that
could become caught on
branches, brush or the
moving parts of the unit.
Secure hair so it is above
shoulder level.
WARNING
In limited circumstances, mistblowers
may also be used in greenhouses that
are very well-ventilated if the operator
can protect himself or herself from any
harmful effects through the use of proper
eye, skin and respiratory protection.
Such work may require special
precautions, and must not be prohibited
on the chemical product label.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts."
WARNING
Never modify this power tool in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL model are
authorized. Although certain
unauthorized attachments are useable
with STIHL power tools, their use may,
in fact, be extremely dangerous.
If this tool is subjected to unusually high
loads for which it was not designed (e.g.
heavy impact or a fall), always check
that it is in good condition before
continuing work. Check in particular that
the fuel system is tight (no leaks) and
that the controls and safety devices are
working properly. Do not continue
operating this machine if it is damaged.
In case of doubt, have it checked by your
STIHL servicing dealer.
Dusting and spreading mode – SR 450
only
The dusting and spreading mode can be
used for powder or dry granulate up to a
grain size of 5 mm.
Observe all legal requirements for
handling the chemicals. Observe the
directions for use on the label of the
product at issue.
SR 430, SR 450
5
English
0002BA085 KN
Using the dusting and spreading mode
WARNING
An electrostatic charge may be created
in the extension tube and nozzle area
when applying dry materials (e.g. dusts)
with the dusting and spreading
attachment. This is especially true in low
humidity conditions. Check the label
and/or material safety data sheet for the
chemical you are applying. To reduce
the risk of severe or fatal injury, do not
use your mistblower to apply substances
that may create a combustible or
explosive dust cloud. For instance,
never use your mistblower to apply
sulfur or sulfur compounds, since they
may be highly explosive and have
relatively low melting and ignition points.
WARNING
To reduce the risk of sparking when
applying any dry substance, make sure
that the discharge system (antistatic
wire in the mistblower connected to a
metal chain) is completely and properly
mounted to the machine, and that the
discharge chain is making contact with
the ground. It is essential to follow the
assembly instructions – see the chapter
"Assembling the Unit" in this instruction
manual.
Do not use the dusting and spreading
attachment on non-conductive surfaces
(e.g. plastic, asphalt).
Never operate your machine with a
missing or damaged discharge system.
HANDLING OF CHEMICALS
WARNING
Some chemicals sprayed with your
power tool may contain toxic and/or
caustic substances. Such chemicals can
be dangerous and cause serious or fatal
injury to persons and animals and/or
severe damage to plants and the
environment.
Avoid direct contact with chemicals.
Follow the chemical manufacturer’s
instructions with respect to any contact
with its product.
WARNING
Read the label each time before mixing
or using the chemical and before storing
or disposing of it. Do not trust your
memory. Careless or improper use may
cause serious or fatal injury.
WARNING
Chemicals can be harmful to individuals,
animals and the environment if
improperly used. In addition, some
chemicals that are caustic, corrosive or
poisonous should not be used in your
mistblowers.
Carefully read the labels on chemical
containers prior to use. Chemicals are
classified into categories of toxicity.
Pesticides regulated by the EPA, for
instance, use signal words to indicate
the product’s potential to make you sick.
"Caution" appears on pesticides found
to be least harmful to humans.
"Warning" indicates a product that is
more poisonous than those in the
"Caution" group. Pesticides with the
6
SR 430, SR 450
English
signal word "Danger" on the label are
very poisonous or irritating. They should
be used with extreme care. Finally,
pesticides labeled "Danger – Poison"
are for restricted use only and generally
must be used under the supervision of a
certified applicator. Each category will
have unique handling characteristics.
Familiarize yourself with the
characteristics for the category you are
using.
Chemicals may be used only by persons
trained in their handling and the
appropriate first-aid measures.
WARNING
Mix only compatible pesticides. Wrong
mixtures can produce toxic fumes.
When handling chemicals and when
spraying, make sure you are operating
in accordance with local, state, and
federal environmental protection rules
and guidelines. Do not spray in windy
conditions. To help protect the
environment, use only the
recommended dosage – do not overuse.
Pay special attention when using near
watersheds, waterway, etc.
WARNING
Do not eat, drink, or smoke while
handling chemicals or while you are
spraying. Never blow through nozzles,
valves, pipes or any other component by
mouth. Always handle chemicals in a
well-ventilated area while wearing
appropriate protective clothing and
safety equipment. Do not store or
transport chemicals together with food
or medicines, and never reuse a
chemical container for any other
purpose.
Do not transfer dry or liquid chemicals to
other containers, especially food and/or
drink containers.
WARNING
In case of accidental contact or ingestion
of chemicals or in case of contamination
of clothing, stop work and immediately
consult the chemical manufacturer’s
instructions. If in doubt as to what to do,
consult a poison control center or doctor
without delay. Have the product’s label
available to read to or show the persons
you consult.
Clean all chemical spills immediately.
Dispose of any residue in accordance
with state or federal laws and
regulations.
WARNING
Keep chemicals out of reach of children,
other unauthorized people and animals.
When not in use, store chemicals in a
safe place. Follow the manufacturer’s
recommendations for proper storage.
Preparing chemicals
Prepare chemical solutions of according
to manufacturer's instructions.
– Only prepare sufficient solution for
the job at hand so that nothing is left
over.
– Mix chemicals only in accordance
with instructions – wrong mixtures
can produce toxic fumes or
explosive mixtures.
– Never spray chemicals undiluted.
– Prepare solution and fill the
container outdoors only, in wellventilated locations.
Storage
– Do not store spray solution in the
container for longer than one day.
– Store and transport spray solution
only in approved containers.
– Never store the spray solution in
containers intended for foods,
drinks or animal feed.
– Do not store spray solution with
foods, drinks or animal feed.
– Keep spray solution out of the reach
of children and animals.
– Store the spray solution in a place
secured against unauthorized use.
Disposal
Never dispose of residual chemicals or
contaminated rinsing solutions in
waterways, drains, sewers, street
gutters or manholes.
Disposal of contaminated rinse should
be in accordance with all applicable
laws, regulations and ordinances.
Observe the precautionary instructions
of the chemical manufacturer.
SR 430, SR 450
7
English
THE USE OF THE POWER TOOL
Transporting the Power Tool
WARNING
Always switch off the engine before
taking the machine off your back and
putting it down. Empty container when
transporting it in a vehicle; properly
secure it to prevent turnover, fuel
spillage and damage to the unit.
Fuel
Your STIHL power tool uses an oil-
gasoline mixture for fuel (see the "Fuel"
chapter in this instruction manual).
WARNING
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and serious burn injury or
property damage. Use
extreme caution when
handling gasoline or fuel
mix. Do not smoke or
bring any fire or flame
near the fuel or the power
tool. Note that combustible fuel vapor may
escape from the fuel
system.
Fueling Instructions
WARNING
To reduce the risk of fire and serious
personal injury, always remove the
backpack mistblower from the
operator’s back and place it on the
ground before attempting to fuel the
machine.
WARNING
Pick a Safe Location
To reduce the risk of fire and explosion,
fuel your power tool in a well-ventillated
area, outdoors away from flames, pilot
lights, heaters, electric motors, and
other sources of ignition. Vapors can be
ignited by a spark or flame many feet
away. Select bare ground for fueling and
move at least 10 feet (3 m) from the
fueling spot before starting the engine.
Wipe off any spilled fuel before starting
your power tool. Take care not to get fuel
on your clothing. If this happens, change
your clothing immediately.
Allow the Power Tool to Cool Before
Removing the Fuel Cap
WARNING
Gasoline vapor pressure may build up
inside the fuel tank. The amount of
pressure depends on a number of
factors such as the fuel used, altitude
and temperature. To reduce the risk of
burns and other personal injury from
escaping gas, vapor and fumes, always
shut off the engine and allow it to cool
before removing the fuel cap.
The engine is air cooled. When it is shut
off, cooling air is no longer drawn across
the cylinder and engine temperatures
will rise for several minutes before
starting to cool. In hot environments,
cooling will take longer. To reduce the
risk of burns and other personal injury
from escaping gas, vapor and fumes,
allow the power tool to cool. If you need
to refuel before completing a job, turn off
the machine and allow the engine to cool
before opening the fuel tank.
Fuel Spraying or “Geysering”
WARNING
Removing the cap on a pressurized fuel
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the fuel tank in all directions. The
escaping gasoline, vapors or fumes can
cause serious personal injury, including
fire and burn injury, or property damage.
Sometimes also referred to as "fuel
geysering," fuel spraying is an expulsion
of fuel, vapors and fumes which can
occur in hot conditions, or when the
engine is hot, and the tank is opened
without allowing the power tool to cool
adequately. It is more likely to occur
when the fuel tank is half full or more.
Pressure is caused by fuel and heat and
can occur even if the engine has not
been running. When gasoline in the fuel
tank is heated (by ambient
temperatures, heat from the engine, or
other sources), vapor pressure will
increase inside the fuel tank.
8
SR 430, SR 450
English
Some blends of gasoline, particularly
those designed for use in winter, are
more volatile and may cause tanks to
pressurize more quickly or create
greater pressure. At higher altitudes,
fuel tank pressurization is more likely.
How to Avoid Fuel Spraying
Removing the fuel cap on a pressurized
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the fuel tank in all directions. To reduce
the risk of burns, serious injuries or
property damage from fuel spraying:
– Follow the fueling instructions in this
chapter.
– Always assume your fuel tank is
pressurized.
– Allow the power tool to cool before
removing the fuel cap.
– In hot environments, cooling will
take longer.
– The engine is air cooled. When it is
shut off, cooling air is no longer
drawn across the cylinder and the
engine temperature will rise for
several minutes before starting to
cool.
After the power tool has cooled
appropriately, follow the safety
instructions in this chapter for removing
the cap.
Never remove the fuel filler cap by
turning it directly to the open position.
First check for residual pressure in the
tank by slowly turning the cap
approximately 1/2 turn counterclockwise. The cap should be held in
place by the threads while allowing
residual vapor/pressure to be relieved.
Once the fumes or vapor have been
relieved, turn the cap further until it can
be removed from the tank opening.
Use only good quality fuel that is
appropriate for the season (summer v.
winter blends). Some blends of
gasoline, particularly winter blends, are
more volatile and can contribute to fuel
spraying.
Removing the Threaded Fuel Filler Cap
WARNING
After allowing the power tool to cool,
remove the fuel filler cap slowly and
carefully to allow any remaining
pressure build-up in the tank to release:
– While maintaining steady,
downward pressure, slowly turn the
cap approximately 1/2 turn counterclockwise.
– If any significant venting occurs,
immediately re-seal the tank by
turning the cap clockwise to the
closed position. Allow the power
tool to cool further before
attempting to open the tank.
– Turn the cap to the open position
only after the contents of the tank
are no longer under pressure.
– Never remove the cap by turning it
directly to the open position. First
allow the power tool to cool
adequately and then release any
residual pressure by slowly turning it
approximately 1/2 turn counterclockwise.
– Never attempt to remove the cap
while the engine is still hot or
running.
Installing the Threaded Fuel Filler Cap
WARNING
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. To reduce the
risk of fuel spillage and
fire, tighten the fuel filler
cap by hand with as
much force as possible.
Damaged or Broken Cap
If your fuel cap does not tighten properly,
it may be damaged or broken. Stop
using the power tool and take it to your
authorized STIHL dealer for repair.
Vapor Lock
WARNING
Vapor lock occurs when fuel in the fuel
line or carburetor vaporizes, causing
bubbles to block the free flow of liquid
fuel into the carburetor. Vapor lock
cannot be relieved or affected by
opening the fuel tank. Removing the fuel
filler cap without first allowing the power
tool to cool adequately can result in fuel
spraying. Always follow the instructions
in this section when removing the fuel
cap.
SR 430, SR 450
9
English
To relieve vapor lock:
– Press the manual fuel pump bulb at
least 20 to 30 times – even if the
bulb is already filled with fuel – to
clear the vapor and send liquid fuel
into the carburetor. Then start the
power tool. For specific starting
instructions, see the appropriate
section of your instruction manual.
– If the manual fuel pump bulb will not
be filled, place the Choke Knob to
the cold start position c and pull
the starter cord until the engine
runs. If the engine does not fire after
10 pulls in the cold start position c,
place the Choke Knob to the warm
start position o and start the
engine in the warm start position o.
– If your power tool will not restart, or
if vapor lock occurs again, the
power tool is being used in
conditions too extreme for the fuel
being used. Discontinue use and let
the engine cool completely before
attempting to start the power tool.
Filling the Container
WARNING
Tighten all connections and check to be
sure the hose is securely attached and
in good condition. Keep the valve lever
on the control lever closed.
Before using the power tool with
chemicals, fill it with fresh water to
assure that you have it properly
assembled and practice spraying. Also,
check for any leaks at this time. When
thoroughly familiar with the power tool
operation, follow normal operating
procedures.
Fill your power tool in well-ventilated
areas, outdoors.
WARNING
Do not use:
– flammables in the mistblower, which
can explode causing serious or fatal
injury;
– caustic or corrosive materials in the
mistblower, that could result in
damage to the unit;
– liquids with a temperature above
120° F (50° C) to avoid scalding and
damage to the unit.
To fill the container, place the power tool
on a level surface. To reduce the risk of
contaminating the surrounding
environment, be careful not to overfill the
container with chemical solution.
To reduce the risk of injury, do not fill the
unit while wearing it on your back.
If you fill the container with a hose
attached to a central water supply, be
sure the end of the hose is out of the
solution to reduce the risk of backflow,
i.e. the chemicals being sucked into the
water supply in the case of a sudden
vacuum.
Calculate the correct amount of
chemical solution so that it is used up at
one time, with no extra solution left in the
tank.
After filling, fit the container cap and
tighten it down firmly.
WARNING
Check for leakage while refilling and
during operation. A leak from the
container or a loose fitting could soak
your clothing and come into contact with
your skin.
Before Operation
WARNING
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger and
setting lever with stop position. The
throttle trigger must move freely and
always spring back to the idle position.
Never attempt to modify the controls or
safety devices.
WARNING
Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
power tools equipped with a manual fuel
pump). Do not start the engine if there
are leaks or damage – risk of fire. Have
the power tool repaired by a STIHL
servicing dealer before using it.
WARNING
To reduce the risk of leakage and skin
contact with chemicals, check that the
container cap and all connections in the
path of the spray are tight, and be sure
the hose is securely attached and in
good condition. Keep the valve lever
closed.
10
SR 430, SR 450
English
271BA003 KN
0002BA084 KN
WARNING
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely and
securely assembled.
WARNING
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
Keep the control handle clean and dry at
all times; it is particularly important to
keep them free of moisture, pitch, oil,
fuel mix, grease or resin in order for you
to maintain a firm grip and properly
control your power tool.
WARNING
To reduce the risk of injury from thrown
parts, check the fan housing for damage
(cracks, nicks, chipping). If any damage
is found, stop using the unit and contact
your STIHL dealer for repair.
Check condition of harness straps and
replace damaged or worn straps.
WARNING
Adjust carrying harness to suit your size
before starting work.
In an emergency, you may slip out of the
harness and throw off the machine
quickly. Try slipping out of the harness a
number of times before using the
machine in order to become
accustomed to it. Do not throw off the
machine while practicing as it could
damage the machine.
For specific starting instructions, see the
appropriate section of your instruction
manual.
Starting
Start the engine at least 10 feet (3 m)
from the fueling spot, outdoors only.
WARNING
Your power tool is a one-person
machine. To reduce the risk of eye or
other injury from thrown objects, insure
that bystanders are at least 50 feet
(15 m) away when starting and during
use. Stop operation immediately if you
are approached.
For specific starting instructions, see the
appropriate section in this instruction
manual. Place the power tool on firm
ground or other solid surface in an open
area. Maintain good balance and secure
footing.
WARNING
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
result in injury to your hand or fingers
and may damage the starter
mechanism.
The assistance of another person may
be needed in placing the unit on your
back after starting. In order to reduce the
risk of injury to the assistant from thrown
objects, chemical spray/dust or from
contact with hot exhaust fumes, the
engine should be kept at idle speed
during this brief period, and your
assistant should not stand in the area of
the outlet nozzle or exhaust. Otherwise,
the unit should be started and operated
without assistance.
During Operation
Holding and Controlling the Power Tool
The mistblower is designed for singlehanded operation with the right hand on
the control handle. It should be carried
as a backpack with the straps of the
harness over both shoulders.
SR 430, SR 450
11
English
WARNING
To reduce the risk of loss of control,
never carry the unit with the strap(s)
over one shoulder.
Wrap your fingers tightly around the
handle, keeping the control handle
cradled between your thumb and
forefinger. Keep your hand in this
position to have your machine under
control at all times.
WARNING
In order to keep the container upright
and reduce the risk of spillage, do not
bend at the waist. Bend only at the
knees and support yourself as required
to ensure proper balance.
Remember that a mistblower filled with
liquid has a significant amount of weight.
Use caution when bending, leaning or
walking.
WARNING
Do not overreach. Keep proper footing
and balance at all times. Special care
must be taken in slippery conditions (wet
ground, snow and ice) and in difficult,
overgrown terrain. Watch for hidden
obstacles such as tree stumps, roots
and ditches to avoid stumbling. For
better footing, clear away fallen
branches, scrub and cuttings. Be
extremely cautious when working on
slopes or uneven ground.
To reduce the risk of stumbling and loss
of control, do not walk backward while
operating the machine. Avoid stepping
on antistatic chain – SR 450 only.
WARNING
To reduce the risk of injury from loss of
control, never work on a ladder, in a tree
or on any other insecure support.
During work breaks, do not leave the
power tool in the hot sun or near any
heat source.
Working Conditions
Operate and start your power tool only
outdoors in a well-ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
WARNING
As soon as the engine is
running, this product generates toxic exhaust
fumes containing chemicals, such as unburned
hydrocarbons (including
benzene) and carbon
monoxide, that are
known to cause respiratory illness / injury,
cancer, birth defects, or
other reproductive harm.
Some of the gases (e.g.
carbon monoxide) may
be colorless and odorless. To reduce the risk of
serious or fatal
injury/illness from inhaling toxic fumes, never run
the machine indoors or in
poorly ventilated
locations.
WARNING
Inhalation of chemicals can cause
susceptible persons to have an allergic
or asthmatic reaction.
Substantial or repeated inhalation of
certain chemicals may cause respiratory
disease, cancer, birth defects or other
reproductive harm. Control the chemical
spray/dust at the source where possible.
Use good work practices, such as
operating the unit so that the wind or
operating process does not blow the
chemical spray/dust back on the
operator. Follow the recommendations
of EPA/OSHA/NIOSH and occupational
and trade associations with respect to
proper usage. When the inhalation of the
chemical spray/dust being applied
cannot be avoided, the operator and any
bystanders may need to wear a
respirator approved by NIOSH/MSHA
for the type of chemical encountered.
Consult the label of the chemical product
being used.
WARNING
If you are unfamiliar with the risks
associated with the particular chemical
at issue, review the product label and/or
material safety data sheet for that
substance and/or consult the material
manufacturer/supplier. You may also
consult your employer, governmental
agencies such as the EPA, OSHA and
NIOSH and other sources on hazardous
materials. The state of California and
some other authorities, for instance,
have published lists of substances
known to cause cancer, reproductive
toxicity, etc.
12
SR 430, SR 450
English
Operating instructions
WARNING
In the event of an emergency, switch off
the engine immediately – move the
setting lever to 0 or STOP.
WARNING
Never spray in the direction of humans,
animals or property which might be
injured or damaged by spray formula.
Pay attention to the direction of the wind,
i.e., do not work against the wind. When
spraying, stand so that the wind does
not blow towards you or bystanders.
Keep children and pets away from areas
that have just been sprayed. After the
use of some chemicals, especially
agricultural pesticides, a notice must be
posted on the treated area that a
"Restricted Entry Interval" (REI) is in
effect. See the product’s label and any
applicable governmental regulations.
DANGER
Your power tool is not
insulated against electric
shock. To reduce the risk
of electrocution, never
operate this power tool in
the vicinity of any wires or
cables (power, etc.)
which may be carrying
electric current. Do not
spray on or near electrical installations.
WARNING
To reduce the risk of personal injury, do
not direct air blast towards bystanders,
since the high pressure of the air flow
could injure eyes and could blow small
objects at great speed.
WARNING
The blower fan between the air intake
and output openings rotates whenever
the engine is running.
Never insert any foreign object into the
air intake of the machine or into the
nozzle of the blower. It will damage the
fan wheel and may cause serious injury
to the operator or bystanders as a result
of the object or broken parts being
thrown out at high speed.
Do not place the blower on the ground
when operating at high speed, because
small objects such as sand, grass, dust,
etc. may be pulled into the air intake and
damage the fan wheel.
WARNING
Never modify your muffler. Any
modification could cause an increase in
heat radiation, sparks or sound level,
thereby increasing the risk of fire, burn
injury or hearing loss. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL servicing dealer only.
WARNING
The muffler and other parts of the engine
(e.g. fins of the cylinder, spark plug)
become hot during operation and remain
hot for a while after stopping the engine.
To reduce risk of burns, do not touch the
muffler and other parts while they are
hot. Keep the area around the muffler
clean. Remove excess lubricant and all
debris such as pine needles, branches
or leaves. Let the engine cool down
sitting on concrete, metal, bare ground
or solid wood away from any
combustible substances.
WARNING
An improperly mounted or damaged
cylinder housing or a
damaged/deformed muffler shell may
interfere with the cooling process of the
muffler. To reduce the risk of fire or burn
injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a
damaged/deformed muffler shell.
Your muffler is furnished with a spark
arresting screen designed to reduce the
risk of fire from the emission of hot
particles. Never operate your unit with a
missing or damaged spark arresting
screen. If your gas/oil mix ratio is correct
SR 430, SR 450
13
English
(i.e., not too rich), this screen will
normally stay clean as a result of the
heat from the muffler and need no
service or maintenance. If you
experience loss of performance and you
suspect a clogged screen, have your
muffler maintained by a STIHL servicing
dealer. Some state or federal laws or
regulations may require a properly
maintained spark arrestor for certain
uses. See the "Maintenance, Repair and
Storing" section of these Safety
Precautions. Remember that the risk of
a brush or forest fire is greater in hot or
dry conditions.
WARNING
Some STIHL power tools
are equipped with a catalytic converter, which is
designed to reduce the
exhaust emissions of the
engine by a chemical process in the muffler. Due
to this process, the muffler does not cool down
as rapidly as conventional mufflers when the
engine returns to idle or
is shut off. To reduce the
risk of fire and burn injuries when using a
catalytic converter,
always set your power
tool down in the upright
position and never locate
it where the muffler is
near dry brush, grass,
wood chips or other combustible materials while it
is still hot.
After Finishing Work
Always wash yourself thoroughly with
soap and water after spraying or
handling chemicals. Shower
immediately, and wash all protective
clothing separately from other items.
Follow any additional recommendations
of the chemical manufacturer.
Always clean dust and dirt off the power
tool.
WARNING
Empty, rinse and clean container and
assembly after each use. This helps to
prevent the solution from crystallizing,
which could later cause clogging and
chemical damage to the unit. In addition,
residual chemicals may have
undesirable effects during subsequent
spraying with a different type of chemical
(e.g., residual herbicide may damage or
kill plants being sprayed with a
pesticide).
Do not store the mistblower with spray
solution in the container.
Store the unit in a place secured against
unauthorized use.
MAINTENANCE, REPAIR AND
STORAGE
WARNING
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non-STIHL parts may cause serious or
fatal injury.
Strictly follow the maintenance and
repair instructions in the appropriate
section in this instruction manual.
Please refer to the maintenance chart in
this instruction manual.
WARNING
Always stop the engine and make sure
that the fan is stopped before doing any
maintenance or repair work or cleaning
the power tool. Do not attempt any
maintenance or repair work not
described in this instruction manual.
Have such work performed by your
STIHL servicing dealer only.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
WARNING
Use the specified spark plug and make
sure it and the ignition lead are always
clean and in good condition. Always
press spark plug boot snugly onto spark
plug terminal of the proper size. A loose
connection between spark plug terminal
and the ignition wire connector in the
boot may create arcing that could ignite
combustible fumes and cause a fire.
Keep spark plug clean, and make sure
ignition lead is in good condition. Do not
use a spark plug with a detachable SAE
adapter terminal. Arcing may occur that
could ignite combustible fumes and
cause a fire. This can result in serious
injuries or damage to property.
14
SR 430, SR 450
English
0002BA073 KN
1
2
WARNING
Never test the ignition system with the
boot removed from the spark plug or
with a removed spark plug, since
uncontained sparking may cause a fire.
WARNING
Do not operate your power tool if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
Your muffler is equipped with a sparkarresting screen to reduce the risk of
fire; never operate your power tool if the
screen is missing, damaged or clogged.
Remember that the risk of a brush or
forest fire is greater in hot or dry
weather.
In California, it is a violation of § 4442 or
§ 4443 of the Public Resources Code to
use or operate gasoline-powered tools
on forest-covered, brush-covered or
grass-covered land unless the engine’s
exhaust system is equipped with a
complying spark arrester that is
maintained in effective working order.
The owner/operator of this product is
responsible for properly maintaining the
spark arrester. Other states or
governmental entities/agencies, such as
the U.S. Forest Service, may have
similar requirements. Contact your local
fire agency or forest service for the laws
or regulations relating to fire protection
requirements.
Tighten all nuts, bolts and screws except
the carburetor adjustment screws after
each use.
For maintenance items please also refer
to the maintenance chart in this
instruction manual.
Store the power tool in a dry and high or
locked location out of reach of children.
Before storing for longer than a few
days, always empty the fuel tank. See
chapter "Storing the machine" in this
instruction manual.
Store fuel in an approved and properly
labeled safety-type canister only. Take
care when handling gasoline! For health
and safety reasons, avoid direct contact
with the skin and avoid inhaling fuel
vapor!
Assembling the Unit
NOTICE
Hose and throttle cable, and the
metering unit's operating cable on the
SR 450, come connected ready for use
and must not be kinked while
assembling the machine.
The combination wrench and
screwdriver are in the supplied
accessory bag.
Fitting the pleated hose on the blower
tube
N Push wide hose clamp (1), marks
facing right, onto the blower tube
(2).
SR 430, SR 450
15
English
2
3
0002BA074 KN
4
5
4
0002BA075 KN
1
2
2
1
0002BA076 KN
3
1
4
3
1
4
0002BA077 KN
2
2
N Push the ring seal (3) (wide lip
facing left) onto the stub on the
blower tube (2).
N Push the pleated hose (4) over the
ring seal (3).
N Push the hose clamp (1) onto the
pleated hose (4).
N Line up the marks on the hose
clamp (1) and blower tube (2) – as
shown.
N Secure the hose clamp (1) with the
screw (5) – the blower tube (2) must
still rotate.
Fitting the pleated hose on the elbow –
SR 430 only
N Push narrow hose clamp (1), marks
facing left, onto the elbow (2).
N Push the pleated hose (3) onto the
elbow (2).
N Push the hose clamp (1) onto the
pleated hose (3).
N Line up the marks on the hose
clamp (1) and elbow (2) – as shown.
N Secure the hose clamp (1) with the
screw (4).
16
SR 430, SR 450
English
3
1
2
0002BA069 KN
1
0002BA078 KN
2
4
3
0002BA079 KN
2
1
3
3
5
2
5
0002BA080 KN
4
4
a
1
0002BA011 KN
2
0002BA058 KN
1
3
Fitting the antistatic system – SR 450
only
N Attach the antistatic wire (1) and
chain (2) to the blower housing with
screw (3).
N Push narrow hose clamp (3), marks
facing left, onto the elbow (4).
N Route the antistatic wire (1) through
the slot in the hose clamp (3).
N Push the pleated hose (2) onto the
elbow (4).
Adjusting and securing the control
handle
N Put the machine on your back and
adjust the harness – see "Harness".
N Slide the control handle (1) along
the tube to the most comfortable
position – distance between nozzle
outlet (2) and the control handle (1)
must be at least 19.7 in (500 mm)
('a').
Fitting the pleated hose on the elbow –
SR 450 only
N Push the antistatic wire (1) into the
pleated hose (2).
SR 430, SR 450
N Secure the control handle (1) with
the screw (3).
N Push the hose clamp (3) onto the
pleated hose (2).
N Line up the marks on the hose
clamp (3) and elbow (4) – as shown.
N Secure the hose clamp (3) with the
screw (5) – make sure the antistatic
wire is located in the notch.
17
English
4
0002BA012 KN
0002BA013 KN
373BA003 KN
373BA004 KN
N Use the retainer (4) to secure the
hose and throttle cable, and
metering unit's operating cable on
the SR 450, to the 6th pleat (arrow)
on the pleated hose.
Adjusting the Throttle Cable
It may be necessary to correct the
adjustment of the throttle cable after
assembling the machine or after a
prolonged period of operation.
Adjust the throttle cable only when the
unit is completely and properly
assembled.
N Set throttle trigger to the full throttle
position – as far as stop.
N Carefully rotate the screw in the
throttle trigger in the direction of the
arrow until you feel initial resistance.
Then rotate it another full turn.
Harness
Adjusting the Harness
N Pull the ends of the straps
downwards to tighten the harness.
N Adjust the harness so that the
backplate fits snugly and securely
against your back.
Loosening the Harness
18
N Lift the tabs of the sliding adjusters.
SR 430, SR 450
English
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
NOTICE
Fuel with an octane rating below 89 may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline!
NOTICE
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects
engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.
WARNING
To reduce the risk of personal injury
from loss of control and/or contact with
the running cutting tool, do not use your
unit with an incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your machine’s idle speed is
incorrectly adjusted, have your
authorized STIHL servicing dealer
check your machine and make the
proper adjustments and repairs.
The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to a
fuel with a much higher or lower ethanol
content.
This problem can be avoided by always
using fuel with the same ethanol
content.
To ensure the maximum performance of
your STIHL engine, use a high quality 2cycle engine oil. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil or ask
your dealer for an equivalent fully
synthetic 2-cycle engine oil.
To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. STIHL MotoMix has a high
octane rating and ensures that you
always use the right gasoline/oil mix
ratio.
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil suited for high
performance engines.
For further details, see
www.STIHLusa.com/ethanol
If not using MotoMix, use only STIHL
two-stroke engine oil or equivalent highquality two-stroke engine oils that are
designed for use in air cooled two-cycle
engines.
The use of non-seasonal gasoline
blends may increase the potential for
pressure to build in the fuel tank during
operation. For example, using a winter
blend during the summer will increase
pressure in the fuel tank. Always use
gasoline blends appropriate to the
season, altitude and other
environmental factors.
Do not use NMMA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
WARNING
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.
The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.
SR 430, SR 450
19
English
0002BA086 KN
The machine's fuel tank should be
cleaned as necessary.
Fuel mix ages
If not using MotoMix, only mix sufficient
fuel for a few days of work, not to exceed
30 days of storage. Store in approved
fuel-containers only. When mixing, pour
oil into the container first, and then add
gasoline. Close the container and shake
it by hand to ensure proper mix of oil and
gasoline.
WARNING
Shaking fuel can cause pressure to build
in the fuel container. To reduce the risk
of fire and severe personal injury or
property damage from fuel spraying,
allow the fuel container to sit for several
minutes before opening. Open the
container slowly to release any residual
pressures. Never open the fuel
container in the vicinity of any ignition
source. Read and follow all warnings
and instructions that accompany your
fuel container.
Gasoline
Oil (STIHL 50:1 or equivalent high-quality oils)
US gal. US fl.oz.
12.6
2 1/2 6.4
512.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Fueling
WARNING
Removing the cap on a pressurized fuel
tank can result in gasoline, vapors and
fumes being forcefully sprayed out from
the tank in all directions. The escaping
gasoline, vapors or fumes, sometimes
referred to as fuel spraying or
"geysering," can cause serious personal
injury, including fire and burn injury, or
property damage.
Fuel spraying can occur when the
engine is hot and the tank is opened
while under pressure. It can occur in hot
environments even if the engine has not
been running. Spraying is more likely to
occur when the fuel tank is half full or
more.
Avoid Injuries from Fuel Spraying.
Always follow the fueling instructions in
this manual:
– Treat every fuel tank as if it is
pressurized, particularly if it is half
full or more.
– Always allow the power tool to cool
adequately before attempting to
open the fuel tank or refueling; this
will take longer in hot conditions.
– Never remove the cap by turning it
directly to the open position. Turn it
first approximately 1/2 of a turn
counter-clockwise to relieve any
residual pressure.
– Never open the fuel tank while the
engine is still hot or running.
– Never open the fuel tank or re-fuel
the power tool near any sparks,
flames or other ignition sources.
– Pick the right fuel: use only good
quality (89 octane or higher), fresh
fuel blended for the season.
– Vapor lock: do not remove the fuel
cap in an effort to relieve vapor lock.
Removing the cap has no effect on
vapor lock.
– Be aware that fuel spraying is more
likely at higher altitudes.
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
filler cap is facing up.
20
SR 430, SR 450
English
002BA447 KN
002BA448 KN
WARNING
In order to reduce the risk of fire and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap slowly and carefully so as to allow
any pressure build-up in the tank to
release slowly.
Opening
WARNING
After allowing the power tool to cool,
remove the fuel filler cap slowly and
carefully to allow any remaining
pressure build-up in the tank to release:
N While maintaining steady,
downward pressure, slowly turn the
cap approximately a 1/2 turn
counter-clockwise.
N If any significant venting occurs,
immediately re-seal the tank by
turning the cap clockwise to the
closed position. Allow the power
tool to cool further before attempting
to open the tank.
N Turn the cap to the open position
only after the contents of the tank
are no longer under pressure.
N Remove the fuel filler cap.
WARNING
Never remove the cap by turning it
directly to the open position. First allow
the power tool to cool adequately and
then release any residual pressure by
slowly turning the cap approximately
1/2 turn counter-clockwise. Never
attempt to remove the cap while the
engine is still hot or running.
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank – leave
approximately 1/2" (13 mm) air space.
Closing
WARNING
An improperly tightened fuel filler cap
can loosen or come off and spill
quantities of fuel. To reduce the risk of
fuel spillage and fire from an improperly
installed fuel cap, tighten the fuel filler
cap by hand with as much force as
possible:
N If your fuel cap still does not tighten
properly, it may be damaged or
broken. Stop using the power tool
and take it to your authorized STIHL
dealer for repair or replacement.
SR 430, SR 450
21
English
1
0002BA017 KN
2
3
0002BA053 KN
a
b
0002BA060 KN
1
0002BA052 KN
2
Information Before You Start
NOTICE
With the engine stopped and before
starting, check the air intakes between
the backplate and powerhead for
blockages and clean if necessary.
Control handle
1 Setting lever
2 Throttle trigger
3 Throttle trigger lockout
Functions of setting lever
Starting / Stopping the
Engine
Before Starting
a 1/3 throttle
b 2/3 throttle
To disengage the travel limiter,
N return the setting lever (1) to the run
position F.
N Close valve lever (1) for solution
feed.
Additionally on SR 450:
Run position F
Engine runs or is ready to start. Throttle
trigger (2) can be moved to any position.
Stop position 0
Ignition is interrupted, engine stops. The
setting lever (1) is not locked in this
position. It springs back to the run
position. The ignition is switched on
again.
Throttle trigger limiter position
Travel of throttle trigger can be limited in
two stages:
22
N Close the metering lever (2) for
dusting and spreading mode.
Starting the Engine
N Observe safety precautions.
NOTICE
Start your unit on a clean, dust-free
surface only to ensure that no dust is
sucked in.
SR 430, SR 450
English
0002BA019 KN
0002BA020 KN
H
LA
L
4
0002BA021 KN
4
0002BA022 KN
0002BA087 KN
N The setting lever must be on F
N Press the manual fuel pump
bulb (3) at least five times – even if
the bulb is filled with fuel.
Cold engine (cold start)
N Press in the choke knob (4) and turn
it to c.
Warm engine (warm start)
N Press in the choke knob (4) and turn
it to o.
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the unit securely on the
ground and make sure that
bystanders are well clear of the
nozzle outlet.
N Make sure you have a firm footing:
Hold the unit with your left hand on
the housing and put one foot against
the base plate to prevent it slipping.
N Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
Do not pull out the starter rope to full
length – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
SR 430, SR 450
23
English
4
0002BA024 KN
0002BA025 KN
As soon as the engine runs
N Pull the throttle trigger – the choke
knob (4) automatically returns to the
run position (e).
At very low outside temperatures
N Open throttle slightly – warm up the
engine for a short period.
Stopping the Engine
N Move the setting lever in the
direction of 0 – the engine stops –
the setting lever springs back to the
on position.
Other Hints on Starting
Engine stalls in cold start position c or
under acceleration
N Move the choke knob to o and
continue cranking until the engine
runs.
Engine does not start in warm start
position o
N Move the choke knob to c and
continue cranking until the engine
runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Fuel tank run until completely dry
N After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is filled with fuel.
N Set the choke knob according to
engine temperature.
N Now start the engine.
24
SR 430, SR 450
English
Operating Instructions Calculating Required
Quantity of Solution
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This helps protect enginemounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Keep the machine
in a dry p lace , wel l awa y fro m sou rces of
ignition, until you need it again. For
longer out-of-service periods – see
"Storing the Machine".
Determining surface area (m2)
In the case of ground crops, simply
multiply the length of the field by its
width.
The surface area of high-growing plants
is calculated approximately by
measuring the length of the rows and the
average height of the foliage. The result
is multiplied by the number of rows and
then by two if both sides have to be
treated.
The surface area in hectares is obtained
by dividing the number of square meters
by 10,000.
Example:
A field 120 meters long and 30 meters
wide has to be treated with a pesticide.
Area:
120 m x 30 m = 3,600 m
2
3,600 / 10,000 = 0.36 ha
Determining quantity of active ingredient
Refer to the instructions supplied with
the active ingredient to determine:
– Required quantity of active
ingredient for 1 hectare (ha).
– Concentration of active ingredient
(mix ratio).
Multiply the required quantity of active
ingredient for 1 hectare by the area
determined in hectares. The result is the
quantity of active ingredient required for
the area to be treated.
Example:
According to the maker’s instructions,
0.4 liters of active ingredient are
required per hectare to obtain a
concentration of 0.1%.
Quantity of active ingredient:
0.4 (l/ha) x 0.36 (ha) = 0.144 l
Determining quantity of solution
The quantity of solution required is
calculated as follows:
T
W
x 100 = T
K
T
= Quantity of active ingredient in
W
B
liters
K K = Concentration in %
T
= Required quantity of solution in
B
liters
Example:
The calculated quantity of active
ingredient is 0.144 liters. According to
the maker’s instructions, the
concentration is 0.1%.
Quantity of solution:
0.144 l
0.1 %
x 100 = 144 l
SR 430, SR 450
25
English
1
0002BA061 KN
A
B
1
Determining walking speed
Carry out a trial run with the machine
fueled and the container filled with
water. Operate the spray tube (swing it
back and forth) as for the real run
described below. Determine the
distance walked in one minute.
Also use the trial run to check the
selected working width. The best
working width for low-growing crops is
4–5 m. Mark the working width with
stakes.
Dividing the distance walked in meters
by the time in minutes gives you the
walking speed in meters per minute
(m/min).
Example:
The distance covered in one minute is
10 meters.
Walking speed:
10 m
1min
= 10 m/min
Determining discharge rate
The setting of the metering unit is
calculated as follows:
V
(l) x vb(m/min) x b(m)
a
V
= Quantity of solution
a
v
= Walking speed
b
= Discharge rate
V
c
A (m2)
= V
(l/min)
c
b = Working width
A = Area
Example:
The values determined above and a
working width of 4 meters require the
following setting on the metering unit:
144 l x 10 (m/min) x 4m
3600 m
Hectares (ha) have to be converted into
2
m
(ha x 10,000 = m2).
2
= 1.6 l/min
To adjust the required discharge rate
see "Metering Unit".
Metering Unit
Valve lever
Solution feed is started and stopped with
the valve lever (1).
N Position A (valve lever vertical, up) –
open
N Position B (valve lever horizontal,
down) – closed
Metering knobs
The scope of supply includes metering
knobs which allow a wide range of
different discharge rates.
26
SR 430, SR 450
English
0002BA065 KN
SR 430
SR 450
0000-GXX-1165-A0
0002BA067 KN
2
1
2431BA022 KN
A
B
C
– Standard metering knob (A) with
positions 1 to 6
– ‘Pressure pump’ metering
– ULV metering knob
knob
1)
(B) with positions 1 to 2.3
1)
(C) with
positions 0.5 to 0.8
Changing the metering knob
N Pull the existing metering knob up
and out of its seat.
N Push the new metering knob into its
seat as far as stop.
Fitting the strainer2)
The strainer supplied must always be
fitted when the ULV metering knob is
used.
0000-GXX-0846-A0
N Push the strainer into its seat until it
snaps into position.
Removing
Adjusting the discharge rate
N Rotate the metering knob (1) for
infinitely variable discharge rate
Position 1 = minimum flow rate
Position 6 = maximum flow rate
The numbers on the metering knob must
be lined up with the lug (2) under the
knob.
The "E" position on the ULV metering
knob is used for emptying the solution
container. Do not use this position for
spraying – see "After Finishing Work".
Machines with pressure pump (special
accessory)
On machines with pressure pump, use
only the ‘pressure pump’ metering knob
or the ULV metering knob.
1)
Standard equipment or available as
special accessory
SR 430, SR 450
N Pry the strainer out of its seat – as
shown.
2)
included with ULV metering knob
27
English
0811BA019 KN
Discharge rate
3 57.5 50.7 42.3
4 83.9 79.1 64.2
5 108.2 89.9 79.1
6 126.1 110.9 95.7
Discharge rate (oz/min) without
pressure pump, with ULV nozzle
Knob setting - 30° 0° + 30°
0.5 1.7 1.4 1.4
Discharge rate (l/min) without pressure
pump, with standard metering knob:
Spray tube angle
Knob setting - 30° 0° + 30°
1 0.12 0.11 0.07
2 0.16 0.14 0.11
3 1.70 1.50 1.25
4 2.48 2.34 1.90
5 3.20 2.66 2.34
6 3.73 3.28 2.83
Discharge rate (l/min) without pressure
pump, with ULV nozzle
Spray tube angle
0.65 2.7 2.7 2.4
0.8 4.4 4.1 3.4
Discharge rate with pressure pump, with
‘pressure pump’ metering knob:
Spray tube angle -30° to +30°
Knob setting Discharge rate l/min
1.0 1.12 (37.9)
1.8 2.30 (77.8)
2.3 3.86 (130.5)
Discharge rate with pressure pump, with
ULV nozzle
Knob setting Discharge rate l/min
Knob setting - 30° 0° + 30°
0.5 0.05 0.04 0.04
0.65 0.08 0.08 0.07
0.8 0.13 0.12 0.10
Discharge rate (oz/min) without
pressure pump, with standard metering
0.5 0.32 (10.8)
0.65 0.54 (18.3)
0.8 0.66 (22.3)
Checking flow rate
knob:
N Place the unit on the ground.
Spray tube angle
Knob setting - 30° 0° + 30°
N Fill the container with water up to
10 liter mark.
14.13.72.4
25.44.73.7
Spray tube angle
(oz)
(oz)
Machines without pressure pump
N Set the standard metering knob to 6.
N Start the machine.
N Hold the spray tube horizontally, run
the engine at full throttle, spray the
contents of the container down to
the 5 liter mark and note the time
taken.
The time required to spray 5 liters fluid
should be between 75 and 105 seconds.
Machines with pressure pump
N Set the ‘pressure pump’ metering
knob to 2.3.
N Start the machine.
N Hold the spray tube horizontally, run
the engine at full throttle, spray the
contents of the container down to
the 5 liter mark and note the time
taken.
The time required to spray 5 liters fluid
should be between 60 and 90 seconds.
In case of deviations:
N Check the container, hose system,
metering knob and optional
pressure pump for contamination
and clean if necessary.
N Check blower air intake and clean if
necessary.
N Check engine setting and correct if
necessary.
If there is no improvement, contact your
dealer for assistance.
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SR 430, SR 450
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