STIHL BR 550, BR 600, BR 500 Owner's Manual
STIHL BR 500, 550, 600
Warning!
Read and follow all safety
precautions in Instruction Manual –
improper use can cause serious or
fatal injury.
Advertencia!
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 - 38
Manual de
instrucciones
39 - 81
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Assembling the Unit 11
Adjusting the Throttle Cable 13
Fitting the Harness 14
4-MIX Engine 14
Fuel 15
Original Instruction ManualPrinted on chlorine-free paper
Fueling 16
Winter Operation 18
Information Before You Start 18
Starting / Stopping the Engine 19
Operating Instructions 21
Replacing the Air Filter 21
Engine Management 22
Adjusting the Carburetor 22
Spark Plug 23
Spark Arresting Screen in Muffler 25
Replacing the Starter Rope and
Rewind Spring 25
Storing the Machine 27
Inspections and Maintenance by
Printing inks contain vegetable oils, paper can be recycled.
Dealer 27
Maintenance and Care 28
Main Parts 30
Specifications 31
Special Accessories 32
Maintenance and Repairs 33
STIHL Incorporated Federal
Emission Control Warranty
Statement 33
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 35
Trademarks 37
Allow only persons who fully understand
this manual to operate your blower.
To receive maximum performance and
satisfaction from your STIHL blower, 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
blower. 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 blower is a high-speed tool,
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, 2011
0458-452-8621-F. M47.F11.CP.
0000000717_005_GB
BR 500, BR 550, BR 600
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
Air intake winter mode
Air intake summer mode
Press to operate manual
fuel pump
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols and signal words described
below:
Danger!
Indicates an imminent risk of severe or
fatal injury.
Warning!
Indicates a hazardous situation which, if
not avoided, could result in severe or
fatal injury.
Caution!
Indicates a risk of property damage,
including damage to the machine or its
individual components.
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
described in this manual, please contact
your STIHL dealer for assistance.
Safety Precautions and
Working Techniques
Because a blower is
gasoline-powered and
produces a strong air
blast, 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
safety precautions and
warnings. Read the
instruction manual and
the safety precautions
periodically. Careless or
improper use may cause
serious or fatal injury.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
Warning!
Do not lend or rent your power tool without the instruction manual. Be sure that
anyone using it understands the information contained in this manual.
Warning!
The use of this machine may be
hazardous.
Use your blower only for clearing leaves,
grass, paper and dust in yards, gardens,
sport stadiums, parks, driveways and
parking lots.
2
BR 500, BR 550, BR 600
English
Warning!
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
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
blowers. Different models may have
different parts and controls. See the
appropriate section of your instruction
manual for a description of the controls
and the function of the parts of your
model.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Safe use of a blower involves
1. the operator
2. the power tool
3. 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.
Warning!
Prolonged use of a power tool (or other
machines) exposing the operator to
vibrations may produce white finger 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 white
finger 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 white
finger disease. In order to reduce the
risk of white finger 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.
– 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 handle with
constant, excessive pressure. Take
frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
white finger 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.
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.
BR 500, BR 550, BR 600
3
English
Proper Clothing
Warning!
To reduce the risk of injury, the operator
should wear proper protective apparel.
Warning!
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protec-
tive glasses with
adequate top and side protection complying with ANSI Z 87.1 (or your
applicable national standard).
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.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement.
Avoid loose-fitting jackets, scarfs, neckties,
jewelry, flared or cuffed
pants, unconfined long
hair or anything that
could become drawn into
the air intake. Secure hair
so it is above shoulder
level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended.
Warning!
To reduce the risk of injury when the
inhalation of dust cannot be substantially controlled use an appropriate
respirator for the material being blown.
For more information see the "Working
conditions" section of these Safety
Precautions.
THE POWER TOOL
For illustrations and definitions of the
power tool parts see the chapter on
"Parts and Controls."
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.
Warning!
Small particles (e.g. dust) blown through
the blower tubes and nozzle can cause
a static charging of the blower tubes.
This is especially true in low humidity
and high dust conditions. In order to
reduce the risk of shock from static
charging and subsequent injury from
loss of control, your blower has features
designed to help reduce the build up of
static electricity in the blower tubes and
equalize the charge with the engine
and/or operator:
The control handle is designed to
conduct static electricity through the
throttle cable to the engine and from the
handle through the operator to the
ground.
STIHL offers an optional kit for use in
especially dry and dusty conditions. The
kit contains: (1) blower tubes made with
graphite to help conduct the charge back
to the control handle, and (2) a metal
ring with "wire" for insertion in the end
tube that helps reduce the buildup of
static electricity.
If your blower is properly assembled and
you are still experiencing static shocks,
make sure that your foot ware has
conductive soles and try operating your
unit without gloves, which may be
interfering with the conduction of the
charge.
4
BR 500, BR 550, BR 600
THE USE OF THE POWER TOOL
452BA116 KN
Transporting the Power Tool
Warning!
Always switch off the engine before taking the machine off your back and
putting it down. 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 oilgasoline mixture for fuel (see the
chapter on "Fuel” of your 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 seri-
ous 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 serious injury from
burns, never attempt to refuel the unit
until it has been completely removed
from the operator.
Warning!
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the engine is running.
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
machine.
Warning!
Check for fuel leakage
while refueling and during operation. If fuel
leakage is found, do not
start or run the engine
until the leak is fixed and
any spilled fuel has been wiped away.
Take care not to get fuel on your clothing. If this happens, change your
clothing immediately.
Different models may be equipped with
different fuel caps.
English
Warning!
In order to reduce the risk of fuel spillage and fire from an improperly
tightened fuel cap, correctly position
and tighten the fuel cap in the fuel tank
opening.
Toolless cap with grip
To do this with this STIHL cap, raise the
grip on the top of the cap until it is upright
at a 90° angle. Insert the cap in the fuel
tank opening with the raised positioning
marks on the grip of the cap and on the
fuel tank opening lining up. Using the
grip, press the cap down firmly while
turning it clockwise as far as it will go
(approx. 1/4 turn).
Fold the grip flush with
the top of the cap. Grip
the cap and check for
tightness. If the grip does
not lie completely flush
with the cap and the
detent on the grip does
not fit in the corresponding recess in the filler
opening, or if the cap is
loose in the filler opening,
the cap is not properly
seated and tightened and
you must repeat the
above steps.
BR 500, BR 550, BR 600
5
English
001BA227 KN
452BA121 KN
Misaligned, damaged or broken cap
If the cap does not drop fully into the
opening when the positioning marks line
up and/or if the cap does not tighten
properly when twisted, the base of the
cap may be prematurely rotated (in
relation to the top) to the closed position.
Such misalignment can result from
handling, cleaning or an improper
attempt at tightening.
Left: Base of cap in closed posi-
tion (with open space)
Right: Base of cap correctly posi-
tioned for installation
To return the cap to the open position for
installation, turn the cap (with the grip
up) until it drops fully into the tank
opening. Next, twist the cap
counterclockwise as far as it will go
(approx. 1/4 turn) – this will twist the
base of the cap into the correct position.
Then, twist the cap clockwise, closing it
normally.
If your cap still does not tighten properly,
it may be damaged or broken;
immediately stop use of the unit and
take it to your authorized STIHL dealer
for repair.
Screw Cap
Warning!
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. In order to
reduce the risk of fuel
spillage and fire, tighten the fuel filler
cap by hand as securely as possible.
See also the "Fueling" chapter in your
Instruction Manual for additional
information.
Before Starting
Warning!
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, setting
lever and stop switch. The throttle trigger must move freely and always spring
back to the idle position. Never attempt
to modify the controls or safety devices.
Warning!
Never operate your power tool if it is
damaged, improperly adjusted or maintained, or not completely or 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 handles 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 parts
thrown by the fan wheel, check the fan
housing for damage (cracks or holes
that could allow foreign objects to contact the fan wheel). If any such damage
is found, stop using the unit and contact
your STIHL dealer for repair.
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.
Starting
To reduce the risk of fire and burn
injuries, start the engine at least 10 feet
(3 m) from the fueling spot, outdoors
only.
6
BR 500, BR 550, BR 600
Warning!
0009BA001 KN
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 during use. Stop operation
immediately if you are approached.
Warning!
This unit is equipped with an ignition
system that is normally in operational
readiness. After the setting lever is used
to stop the engine, it automatically
springs back to the "on" position. If the
engine is warm, it may be possible to
start it by simply pulling the starter rope,
with no further adjustments. To reduce
the risk of injury, be particularly alert to
keep children away from the unit.
For specific starting instructions, see the
appropriate section of your 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.
Once the engine has started,
immediately blip the throttle trigger,
which should cause the choke knob to
move to the run position and allow the
engine to slow down to idle.
During Operation
Holding and Controlling the Power
Tool
The blower 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.
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.
English
Warning!
Special care must be taken in slippery
conditions (wet ground) and in difficult,
overgrown terrain. Watch for hidden
obstacles such as tree stumps, roots,
rocks, holes 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.
Warning!
To reduce the risk of injury from loss of
control, never work on a ladder or on
any other insecure support.
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.
BR 500, BR 550, BR 600
7
English
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 problems, 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.
If exhaust fumes become concentrated
due to insufficient ventilation, clear
obstructions from work area to permit
proper ventilation before proceeding
and/or take frequent breaks to allow
fumes to dissipate before they become
concentrated.
Warning!
Inhalation of certain dusts, especially
organic dusts such as mold or pollen,
can cause susceptible persons to have
an allergic or asthmatic reaction. Substantial or repeated inhalation of dust
and other airborne contaminants, in particular those with a smaller particle size,
may cause respiratory or other illnesses. This includes wood dust,
especially from hardwoods, but also
from some softwoods such as Western
Red Cedar. Control dust at the source
where possible. Use good work practices, such as operating the unit so that
the wind or operating process directs
any dust raised by the power tool away
from the operator. Follow the recommendations of EPA/OSHA/NIOSH and
occupational and trade associations
with respect to dust ("particulate matter"). When the inhalation of dust cannot
be substantially controlled, i.e., kept at
or near the ambient (background) level,
the operator and any bystanders should
wear a respirator approved by
NIOSH/MSHA for the type of dust
encountered.
Warning!
If the substance being blown is a commercial substance, review the material
safety data sheet for that substance and
/ or consult the material manufacturer /
supplier. The state of California and
some other authorities, for instance,
have published lists of substances
known to cause cancer, reproductive
toxicity, etc.
Warning!
Breathing asbestos dust is dangerous
and can cause severe or fatal injury,
respiratory illness or cancer. The use
and disposal of asbestos-containing
products have been strictly regulated by
OSHA and the Environmental Protection Agency. If you have any reason to
believe that you might be blowing or otherwise disturbing asbestos, immediately
contact your employer or a local OSHA
representative.
Warning!
Dust with silica in its composition may
contain crystalline silica. Silica is a basic
component of sand, quartz, brick, clay,
granite and numerous other minerals
and rocks, including masonry and concrete products. Repeated and / or
substantial inhalation of airborne crystalline silica can cause serious or fatal
respiratory disease, including silicosis.
In addition, the state of California and
some other authorities have listed
respirable crystalline silica as a substance known to cause cancer. When
encountering such materials, always
follow the respiratory precautions mentioned above.
Operating Instructions
Warning!
In the event of an emergency, switch off
the engine immediately – move the setting lever to 0 or STOP.
8
BR 500, BR 550, BR 600
Warning!
Even though bystanders should be kept
away from the running power tool, never
work alone. Keep within calling distance
of others in case help is needed.
Stop the engine immediately if you are
approached.
Warning!
To reduce the risk of personal injury, do
not direct air blast towards bystanders,
since the high pressure of the air flow
can injure eyes and can 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. It is best to turn
the machine off when putting it on the
ground.
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
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.
MAINTENANCE, REPAIR AND
STORING
Maintenance, replacement, or repair
of the emission control devices and
systems may be performed by any
nonroad engine repair establishment
BR 500, BR 550, BR 600
9
English
or individual. However, if you make a
warranty claim for a component
which has not been serviced or
maintained properly or if
nonapproved replacement parts were
used, STIHL may deny coverage.
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. (Note: If
terminal has detachable SAE adapter
nut, it must be securely attached.) 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.
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
spark-arresting 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 or 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!
10
BR 500, BR 550, BR 600
English
452BA101 KN
1
2
3
452BA102 KN
1
2
452BA095 KN
1
2
3
452BA096 KN
1
2
3
2
1
452BA108 KN
3
452BA109 KN
2
1
4
3
Assembling the Unit
Mounting the Control Handle
N Pull the two halves of the clamp
apart.
N Push the control handle (1) onto the
blower tube (2).
Mounting the Blower Tubes
BR 500
N Depending on your size and reach:
Push blower tube (1) up to the
appropriate mark on the blower
tube (2).
N Rotate the blower tube (1) in the
direction of the arrow and engage it
in the appropriate slot (3).
BR 550, BR 600
Mounting the Hose Clamps and
Pleated Hose
N Push the hose clamp (1) (with
retainer for throttle cable) onto the
elbow (3) – the positioning marks
must face to the left.
N Push the pleated hose (2) over the
elbow (3).
N Line up the control handle (1) with
the tube's seam – as shown.
N Secure the control handle (1) with
the screw (3) so that it can still be
moved on the blower tube (2).
BR 500, BR 550, BR 600
N Depending on your size and reach:
Push blower tube (1) up to the
appropriate mark on the blower
tube (2).
N Rotate the blower tube (1) in the
direction of the arrow and engage it
in the appropriate slot (3).
N Push the hose clamp (1) onto the
pleated hose (2).
N Line up the positioning marks on the
hose clamp (1) and elbow (3) – the
screw eye faces down.
N Secure the hose clamp (1) with the
screw (4).
11
English
2
452BA103 KN
5
6
2
5
452BA104 KN
6
7
3
1
2
452BA111 KN
3
1
2
452BA112 KN
3
452BA110 KN
1
2
N Push the hose clamp (5) (without
retainer for throttle cable) onto the
elbow (6) – the positioning marks
must face to the right.
N Push the blower tube (6) into the
pleated hose (2).
N Push the hose clamp (5) onto the
pleated hose (2).
N Line up the hose clamp (5) and
blower tube (6) – as shown.
N Secure the hose clamp (5) with the
screw (7).
Mounting the nozzle
N Push the nozzle (1) onto the blower
tube (2) and engage it on the
lugs (3).
Removing the Nozzle
N Rotate the nozzle (1) in the direction
of the arrow until the lugs (3) are
covered.
N Pull the nozzle (1) off the blower
tube (2).
Adjusting the Control Handle
N Move the control handle (1) along
the blower tube (2) to the most
comfortable position.
N Secure the control handle (1) with
the screw (3).
N Engage the throttle cable (4)
with sleeve (5) in the retainer (6).
12
BR 500, BR 550, BR 600
English
452BA100 KN
Wear Mark on Nozzle
The front end of the nozzle is worn by
ground contact during operation.
Replace the nozzle when it has worn as
far as the wear mark.
Fitting the Transport Aid
When storing or transporting the
machine:
N Secure the blower tube to the
handle on the backplate.
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 screw home the screw in
the throttle trigger until you feel
initial resistance.
N Secure the velcro strip to the blower
tube – pull the flap through the
buckle.
BR 500, BR 550, BR 600
13
English
373BA003 KN
373BA004 KN
Fitting the Harness
N Adjust the harness straps so that
the backplate fits snugly and
securely against your back.
A Adjust height
B Adjust angle
Tightening the harness straps
Loosening the harness straps
N Lift the tabs of the sliding adjusters.
4-MIX Engine
The STIHL 4-MIX engine features
mixture lubrication and must be run on a
fuel mixture of gasoline and engine oil.
It operates otherwise on the 4-stroke
principle.
N Pull the ends of the straps
downward.
14
BR 500, BR 550, BR 600
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.
Fuel with a lower octane rating 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 even
damage the engine. For this reason
STIHL recommends that you use only
high-quality unleaded gasoline!
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
The ethanol content in gasoline affects
engine running 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 incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your power tool shows an incorrect
idle adjustment, have your STIHL dealer
check your power tool and make 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
another fuel with a much higher or lower
ethanol content.
This problem can be avoided by always
using fuel with the same ethanol
content.
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke
engine oils that are designed for use
only in air cooled two-cycle engines.
We recommend STIHL HP Ultra 2-Cycle
Engine Oil since it is specially
formulated for use in STIHL engines.
Do not use BIA 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.).
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.
The machine‘s fuel tank should be
cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days
work, not to exceed 3 months 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 vigorously by
hand to ensure proper mixing of the oil
with the fuel.
Gasoline
US gal. US fl.oz.
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Oil (STIHL 50:1 or equivalent high-quality oils)
BR 500, BR 550, BR 600
15
English
452BA123 KN
452BA119 KN
452BA125 KN
001BA218 KN
001BA219 KN
001BA224 KN
452BA116 KN
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
In order to reduce the risk of fire
and personal injury from escaping
gas vapor and fumes, remove the
fuel filler cap carefully so as to
allow any pressure build-up in the
tank to release slowly.
One of two different filler caps is
installed as standard at the factory.
Toolless filler cap (with folding grip)
Threaded filler cap
Opening the toolless filler cap
N Raise the grip into an upright
position.
N Turn the cap counterclockwise
(approx. 1/4 turn).
N Remove fuel filler cap.
Refueling
Take care not to spill fuel while fueling,
and do not overfill the tank. STIHL
recommends use of the STIHL filling
system (special accessory).
Closing the toolless filler cap
16
With grip in an upright position:
BR 500, BR 550, BR 600
English
452BA117 KN
452BA118 KN
452BA119 KN
452BA120 KN
002BA447 KN
002BA448 KN
N Insert the cap – the raised
positioning marks on the cap and
the fuel tank opening must line up.
N The cap should drop fully into the
opening in this position. Make sure
tank is not overfilled.
N While pressing the cap down firmly,
twist it clockwise as far as it will go
(approx. 1/4 turn).
N Fold down the grip.
Checking for proper closure
N The lug on the grip must engage
entirely in the recess (arrow), and
the grip must lie completely flush
with the top of the cap.
N Grip the cap and check for
tightness.
N If the cap can be moved, it is not
properly installed.
N If the cap does not tighten properly,
the cap parts may be misaligned
with each other, or the cap may be
damaged or broken. See the
"Fueling Instructions" section of the
Safety Precautions for how to
correct a misaligned cap and
additional information. Never use
your machine with a misaligned,
damaged or broken cap.
Opening the threaded filler cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the filler cap.
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank. STIHL
recommends use of the STIHL filling
system (special accessory).
Closing the threaded filler cap
N Position cap.
N Turn the cap clockwise as far as it
will go and tighten it as securely as
possible by hand.
BR 500, BR 550, BR 600
17
English
452BA084 KN
1
2
452BA085 KN
3
4
3
452BA086 KN
452BA020 KN
1
2
Winter Operation
At temperatures below 50°F (+10°C):
N Remove the filter cover (1) and air
filter element (2).
N Swing the shutter (4) to the winter
position (r).
N Tighten down the screw (3) firmly.
N Refit the filter cover and air filter
element.
Do not operate your machine at
temperatures below 14°F (-10°C)
– exposure to low temperatures
may damage machine
components.
At temperatures above 70°F (+20°C):
N Always return the shutter (4) to the
summer position (s)
since there is otherwise a risk of
engine running problems due to
overheating.
Information Before You
Start
1 Setting lever
2 Throttle trigger
The three positions of the setting
lever
Engine stop 0 – ignition interrupted,
engine stops. The setting lever does not
remain in ths position, it springs back.
Normal run position F – engine runs or
is ready to start. Throttle trigger can be
operated normally.
Lock position C – the throttle trigger
can be locked in three positions: 1/3
throttle, 2/3 throttle and full throttle. To
disengage the lock, move the setting
lever (1) back to the normal run
position F.
N Loosen the screw (3).
18
BR 500, BR 550, BR 600
English
452BA115 KN
Starting / Stopping the
Engine
Starting the engine
N Observe safety precautions.
Start your unit on a clean, dustfree surface only to ensure that no
dust is sucked in.
N The setting lever (1) must be on F
N Press the fuel pump bulb at least
five times – even if the bulb is filled
with fuel.
Cold engine (cold start)
N Turn the choke knob to l.
Warm engine (warm start)
N Turn the choke knob to n.
Also use this setting if the engine has
been running but is still cold.
Starting
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 Crank the engine until it begins to
fire. After no more than three
attempts, turn the choke knob to n.
BR 500, BR 550, BR 600
19
English
452BA026 KN
1
When the engine begins to fire:
If the engine is cold:
N Turn the choke knob to n and
continue cranking until the engine
runs.
If the engine is warm:
N Continue cranking until the engine
runs.
As soon as the engine runs
To switch to idle speed:
At very low outside temperatures:
N Open throttle slightly – warm up the
engine for a short period.
Shutting down the engine
N Move the setting lever to 0 – the
engine stops – the setting lever
springs back to the on position.
If the engine does not start
N Turn the choke knob to n.
N Move the setting lever (1) to C.
N Engage the throttle trigger (2) in the
full throttle position.
N Continue cranking until the engine
runs.
Throttle cable adjustment
N Check adjustment of throttle cable –
see chapter on "Adjusting the
Throttle Cable".
N Blip the throttle trigger – the choke
knob automatically returns to the
run position (F)
or
N Turn the choke knob to the normal
run position (F).
20
Choke knob
If you did not turn the choke knob to n
quickly enough after the engine began to
fire, the combustion chamber is flooded.
If fuel tank has been run completely
dry and then refueled
N After refueling, press the 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.
BR 500, BR 550, BR 600
Operating Instructions Replacing the Air Filter
English
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 protects enginemounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty the fuel tank
and keep the machine in a dry place,
well away from sources of ignition, until
you need it again. For longer out-ofservice periods – see "Storing the
Machine".
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power
N Remove the filter element (3).
N Replace dirty or damaged filters.
N Fit the new filter in the filter housing.
N Fit the filter cover.
N Insert the screws and tighten them
down firmly.
N Turn the choke knob to l.
N Loosen the screws (1).
N Remove the filter cover (2).
BR 500, BR 550, BR 600
21
English
452BA105 KN
H
L
H
L
Engine Management Adjusting the Carburetor
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
Machines without adjustable
carburetor
On certain machine versions it is no
longer necessary to adjust the
carburetor. Such machines have no
setting symbol on the shroud.
These machines have been set at the
factory to provide an optimum fuel-air
mixture in all locations and operating
conditions.
Adjusting idle speed
Engine stops while idling:
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Machines with adjustable carburetor
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed and low speed
screws within fine limits.
Standard Setting
N Shutting down the engine
N Check the air filter and replace it if
necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
N Check the spark arresting screen
(country-specific) in the muffler and
clean or replace if necessary.
N Carefully turn both adjusting screws
counterclockwise as far as stop:
N The high speed screw (H) is 3/4 turn
open.
N The low speed screw (H) is 3/4 turn
open.
N Start and warm up the engine.
22
BR 500, BR 550, BR 600
English
2
452BA092 KN
Adjusting idle speed
Engine stops while idling
N Check the standard setting.
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Erratic idling behavior, engine stops
even though setting of LA screw has
been corrected, poor acceleration
Idle setting is too lean
N Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N Turn the low speed screw (L)
clockwise, no further than stop, until
the engine runs and accelerates
smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Fine Tuning for Operation in
Mountains or at Sea Level
At high altitude
N Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
At sea level
N Turn high speed screw (H)
counterclockwise (richer) – no
further than stop.
Spark Plug
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
Removing the Spark Plug
N Pull off the spark plug boot (1).
N Unscrew the spark plug (2).
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level.
N Check the standard setting.
N Warm up the engine.
BR 500, BR 550, BR 600
23
English
000BA039 KN
A
2
1
002BA363 KN
3
002BA178 KN
2
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Use only resistor type spark plugs of
the approved range.
Rectify problems which have caused
fouling of spark plug:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions,
e.g. operating at part load.
Warning!
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press spark plug boot (1)
snugly onto spark plug terminal (2) of
the proper size. (Note: If terminal has
detachable SAE adapter nut, it must be
attached.) A loose connection between
spark plug boot and ignition wire connector in the boot may create arcing that
could ignite combustible fumes and
cause a fire.
Installing the spark plug
N Screw the spark plug (3) into the
cylinder and fit the boot (2) (press it
down firmly).
24
BR 500, BR 550, BR 600
English
2
1
452BA090 KN
1
452BA091 KN
3
213BA018 KN
Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
N If the engine is down on power,
check the spark arresting screen in
the muffler.
N Wait for the muffler to cool down.
N Loosen the screws (1).
N Remove the scoop (2).
Replacing the Starter Rope
and Rewind Spring
Replacing the Starter Rope
N Take out the screws (1).
N Remove the starter cover (2).
N Carefully remove the rope rotor with
washer (4) and pawls (5).
N Use a screwdriver to pry the rope
out of the starter grip.
N Remove the remaining rope from
the rotor and starter grip.
N Thread the new rope through the
starter grip and tie one of the special
knots shown.
N Pull the knot back into the grip.
N Remove the spark arresting
screen (3).
N Clean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one.
N Refit the spark arresting screen.
N Fit the scoop.
BR 500, BR 550, BR 600
N Use a screwdriver or suitable pliers
to remove the spring clip (3) from
the starter post.
The rewind spring may pop out
and uncoil during this operation –
take care to avoid the risk of
injury.
wear face protection and work
gloves.
25
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