STIHL BG 56, 66, 86, SH 56, 86
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 - 35
Manual de instrucciones
36 - 75
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Assembling the Blower 12
Assembling the Vacuum Shredder 14
Fuel 15
Fueling 17
Starting / Stopping the Engine 19
Original Instruction ManualPrinted on chlorine-free paper
Cleaning the Air Filter 21
Engine Management 22
Adjusting the Carburetor 22
Spark Plug 23
Engine Running Behavior 24
Storing the Machine 24
Spark Arresting Screen in Muffler 25
Maintenance and Care 26
Main Parts 27
Specifications 28
Maintenance and Repairs 30
Disposal 30
Limited Warranty 30
STIHL Incorporated Federal
Printing inks contain vegetable oils, paper can be recycled.
Emission Control Warranty
Statement 31
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 33
Trademarks 35
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, 2021
0458-296-8621-D. VA8.L21.
0000008483_006_GB
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
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
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.
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.
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 or the STIHL
distributor for your area for assistance.
Safety Precautions and
Working Techniques
Because the use of any
blower may be danger
ous, 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
Use your blower for clearing leaves,
twigs, grass, clippings, paper, debris,
and dust in yards, gardens, sport
stadiums, parks, paths, streets,
driveways and parking lots and for
similar tasks.Do not use it for other
purposes, since misuse may result in
personal injury or property damage,
including damage to the machine.
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English
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.
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 whitefinger
disease (Rayn aud'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.
Keep your hands warm.
Keep the antivibrationsystem well
maintained. A power tool with loose
components or with damaged or worn
antivibration element 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.
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.
Proper Clothing
WARNING
To reduce the risk of injury, the operator
should wear proper protective apparel.
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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 Z87 "+" (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 jack
ets, 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.
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Good footing is very
important. Do not wear
sandals or go barefoot.
THE POWER TOOL
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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.
WARNING
Small particles (e.g. dust) blown through
the blower tube and nozzle can cause a
static charging of the blower tube. 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 tube 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.
THE USE OF THE POWER TOOL
Transporting the Power Tool
WARNING
When transporting your power tool 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).
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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 combus
tible fuel vapor may
escape from the fuel
system.
Fueling Instructions
WARNING
To reduce the risk of fire and serious
personal injury, always place the power
tool 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
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-
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.
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.
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– 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 quanti
ties 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.
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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 g and pull
the starter cord until the engine
runs. If the engine does not fire after
10 pulls in the cold start
position g, place the Choke Knob
to the warm start position < and
start the engine in the warm start
position <.
– 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.
Before Operation
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
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
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely and
securely assembled.
To reduce the risk of injury, do not
operate your blower unless it has a
properly mounted blower tube.
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.
For specific starting instructions, see the
appropriate section of your instruction
manual.
Starting
WARNING
Start the engine at least 10 feet
(3 meters) from the fueling spot,
outdoors only.
WARNING
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
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
To reduce the risk of injury from loss of
control, do not attempt to "drop start"
your power tool.
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.
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295BA052 KN
WARNING
Once the engine has started,
immediately blip the throttle trigger,
which should release the starting throttle
and allow the engine to slow down to
idle.
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.
During Operation
Holding and Controlling the Power Tool
The blower is designed for singlehanded operation. It must be carried by
the control handle in the right hand.
Watch out for small animals when using
the blower on open ground, in yards and
gardens.
WARNING
Operate the unit only with a properly
mounted blower tube.
The round nozzle is particularly suitable
for use on uneven surfaces (e.g. fields
and lawns).
The fan nozzle (either included with unit
or available as special accessory)
produces a broad and powerful
airstream at ground level. It can be
aimed and controlled very accurately.
This nozzle is highly effective for blowsweeping sawdust, leaves, grass
cuttings, etc. on paved surfaces.
Special care must be taken in slippery
conditions (wet ground, snow) 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.
WARNING
To reduce the risk of injury from loss of
control, never work on a ladder, in a tree
or any other insecure support. Never
hold the machine above shoulder
height.
Working conditions
To minimize blowing time, use a rake
and broom to loosen dirt particles before
you start blowing.
Save water by using a blower instead of
a water hose for lawn and garden work
wherever possible, e.g. for cleaning
yards and patios.
Recommended working technique to
minimize air pollution:
– If conditions are very dusty, dampen
surfaces slightly before blowing.
– Pull out the nozzle to full length so
that the airstream is at ground level.
– Do not blow particles in the direction
of bystanders, in particular in the
direction of children, pets, open
windows or freshly washed
vehicles. Take special care in such
situations.
– Remove the blow-swept debris in
rubbish bins – do not blow it onto the
neighbor's land.
Recommended working technique to
minimize noise:
– Operate your power tool at
reasonable times only – not early in
the morning, late at night or during
midday rest periods when people
could be disturbed. Observe local
rest periods.
– Fewer engines mean less noise.
Where possible, do not run more
than one power tool at any time.
– Operate blowers at the lowest
engine speed necessary to
accomplish the task.
– Check your blower before starting
work. Pay special attention to the
muffler, air intakes and air filter.
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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 gen
erates toxic exhaust
fumes containing chemi
cals, such as unburned
hydrocarbons (including
benzene) and carbon
monoxide, that are
known to cause respira
tory problems, cancer,
birth defects, or other
reproductive harm. Some
of the gases (e.g. carbon
monoxide) may be color
less and odorless. To
reduce the risk of serious
or fatal injury/illness from
inhaling toxic fumes,
never run the machine
indoors or in poorly venti
lated locations.
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. 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
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-
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,
understand and follow all warnings and
instructions contained in 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.
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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 slide
control / stop switch to 0 or STOP
In order to reduce
the risk of personal
or even fatal injury
to bystanders from
blown objects
keep bystanders at
least 16 feet (5m)
away when the
power tool is
running.
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
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can injure eyes and can blow small
objects at great speed. Do not direct
airblast towards pets.
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
(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 cata
lytic converter, which is
designed to reduce the
exhaust emissions of the
engine by a chemical pro
cess in the muffler. Due
to this process, the muf
fler does not cool down
as rapidly as conven
-
tional mufflers when the
engine returns to idle or
is shut off. To reduce the
risk of fire and burn inju
ries 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 com
bustible materials while it
is still hot.
Using the Vacuum Attachment
(only BG 56, BG 86, SH 56, SH 86)
For specific assembling instructions,
see the appropriate section of your
instructions manual. Do not use this
appliance in vacuum mode without the
catcher bag.
-
-
-
-
-
10
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
295BA053 KN
The vacuum attachment is designed for
two-handed operation. Hold and operate
the unit with your right hand on the
control handle and your left hand on the
assist handle.
Wear the catcher bag shoulder strap
over your left shoulder – not across your
chest – so that you can quickly throw off
the unit and catcher bag in an
emergency.
WARNING
To reduce the risk
of injury, do not
operate the
machine unless it
is fully assembled
with a properly
mounted suction
tube and catcher
bag.
WARNING
In order to reduce the risk
of injury from contact with
rotating parts and dam
age to the engine, the
intake screen must
always be closed and the
locking tab engaged
when the suction tube is
not mounted. Stop
engine and wait until the
fan is stopped before
opening the intake
screen.
WARNING
To reduce the risk of per
sonal injury from fire and
explosion, never attempt
to vacuum hot or burning
substances (e.g. smold
ering ashes, glowing
cigarettes) or combus
-
tible fluids (e.g. gasoline,
paint thinners).
WARNING
Vacuuming unsuitable materials may
block the fanwheel. Switch off the unit
immediately. Then clear the blockage.
Take particular care when vacuuming
wet leaves since they may block the
blower wheel and elbow.
WARNING
Never vacuum solid objects such as
nails, steel shavings, tacks, rocks or
-
broken glass. These objects may be
struck by the fan wheel and flung away
at high speed and may cause injury to
the operator or bystander.
NOTICE
Vacuuming abrasive material (such as
grit, stone chips, etc.) causes the blower
wheel and blower housing to wear at a
rapid rate. This results in a considerable
loss of suction power. In such a case
you should contact your dealer. STIHL
recommends a STIHL servicing dealer.
-
Watch out for small animals when using
the vacuum on open ground, in yards
and gardens.
-
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
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
11
English
1
3
296BA016 KN
296BA017 KN
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.
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 Blower
Mounting the Blower Tube
N Line up the arrows (1).
N Position the union nut so that the
symbol ‚ is in line with the arrows.
N Push the blower tube (2) into the fan
housing stub (3) as far as stop.
N Push the union nut (4) over the fan
housing stub as far as stop.
N Rotate the union nut (4) in direction
of arrow until symbol ƒ is in line
with the arrows – union nut snaps
audibly into position.
12
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
a
b
5
6
2
296BA031 KN
1
296BA018 KN
3
296BA019 KN
a
6
5
2
296BA032 KN
296BA020 KN
BG 56, BG 86, SH 56, SH 86
N Push nozzle (5) onto blower
tube (2) as far as lug (6),
position (a) (long) or position (b)
(short), and rotate nozzle in
direction of arrow to lock in position.
BG 66
N Line up the arrows (1).
N Position the union nut so that the
symbol ‚ is in line with the arrows.
N Push the blower tube (2) into the fan
housing stub (3) as far as stop.
N Insert a suitable tool through the
opening in the union nut to press
down the tab.
N Rotate the union nut in the direction
of the arrow as far as the stop.
N Remove the blower tube.
N Push the union nut (4) over the fan
housing stub as far as stop.
N Rotate the union nut (4) in direction
of arrow until symbol ƒ is in line
with the arrows – union nut snaps
audibly into position.
N Push nozzle (5) in position (a) onto
the blower tube (2) as far as lug (6)
and rotate in direction of arrow to
lock in position.
Removing the Blower Tube
N Shut down the engine.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
13
English
4
295BA058 KN
3
2
1
5
296BA021 KN
6
8
296BA022 KN
295BA080 KN
1
2
269BA030 KN
4
3
296BA023 KN
Assembling the Vacuum
Shredder
Mounting the Elbow
N Push the elbow (1) into the catcher
bag (2) as far as the mark (smaller
arrow).
N Tighten strap (3) on catcher bag
and press down the tab (4).
NOTICE
Make sure the zipper on the catcher bag
is closed.
N Line up the arrows (5).
N Position the union nut so that the
symbol ‚ is in line with the arrows.
N Push the elbow into the recess in
the fan housing stub (6) as far as
stop.
14
N Push the union nut (7) over the fan
housing stub as far as stop.
N Rotate the union nut (7) in direction
of arrow until symbol ƒ is in line
with the arrows – union nut snaps
audibly into position.
Assembling the Suction Tube
N Line up the arrows on the suction
tube and extension tube. Push
together and lock in position.
Mounting the Suction Tube
N Shut down the engine.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
N Insert screwdriver in the tab (1) and
press down to disengage the intake
screen (2) and then open the intake
screen.
N Line up the arrows (3).
N Position union nut (5) so that the
opening lines up with the arrows (3).
N Push the suction tube into the fan
housing stub (4) as far as stop.
N Push the union nut (5) over the fan
housing stub.
N Rotate union nut (5) in direction of
296BA033 KN
296BA024 KN
296BA025 KN
arrow until it snaps audibly into
position.
N Continue turning the union nut in
direction of arrow and tighten it
down firmly.
Removing the Elbow
N Shut down the engine.
N Insert a suitable tool through the
opening in the union nut to press
down the tab.
N Rotate the union nut in the direction
of the arrow as far as the stop.
N Remove the elbow.
Removing the Suction Tube
N Shut down the engine.
N Rotate the union nut in the direction
of the arrow as far as the stop.
N Insert a suitable tool through the
opening in the union nut to press
down the tab.
N Continue turning the union nut in the
direction of the arrow as far as the
next stop.
N Remove the suction tube.
N Close the intake screen and lock it
in position.
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.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
15
English
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.
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.
-
Gaso
line
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 equiva
lent high-quality oils)
-
16
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
295BA064 KN
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.
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.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
17
English
002BA447 KN
002BA448 KN
295BA065 KN
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.
Change the fuel pick up body every year
Before storing your machine for a long
period, drain and clean the fuel tank and
run engine until carburetor is dry.
18
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
1
296BA009 KN
295BA069 KN
296BA007 KN
3
295BA067 KN
295BA068 KN
296BA006 KN
Starting / Stopping the
Engine
Starting the Engine
N Observe safety precautions.
N Press the manual fuel pump
bulb (1) at least five times – even if
the bulb is already filled with fuel.
Adjusting the setting lever
BG 86, SH 86 only
N To start, move the setting lever to
the run position F
The setting lever (2) allows the throttle
trigger (3) to be locked in the full throttle
position during operation.
Adjusting the choke knob
If the engine is cold
N Set the choke knob to g
If the engine is warm
N Set the choke knob to <
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the machine on the ground so
that it is secure.
N Make sure you have a firm footing:
Hold the machine firmly with your
right hand on the housing and press
down.
N Hold the starter grip with your left
hand.
Version with Easy2Start
N Pull the starter grip steadily.
Version without Easy2Start
N Pull the starter grip slowly until you
feel it engage and then give it a brisk
strong pull.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
19
English
296BA008 KN
3
296BA008 KN
295BA072 KN
295BA073 KN
1
296BA009 KN
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
As Soon as Engine Runs
N Blip the throttle trigger (3) – the
choke knob moves to the run
position F – the engine returns to idle
speed.
Stopping the Engine
BG 56, BG 66, SH 56
N Move the stop switch to 0 – the
engine stops – the stop switch
springs back to the on position.
BG 86, SH 86
N Move the setting lever to 0 – the
engine stops – the setting lever
springs back to the on position.
If engine does not start
N Make sure all settings are correct
(choke knob, setting lever in run
position F).
N Repeat the starting procedure.
If fuel tank has been run completely dry
and then refueled
N Press the manual fuel pump
bulb (1) at least five times – even if
the bulb is already filled with fuel.
N Now start the engine.
20
Other Hints on Starting
If the engine stops while the choke knob
in on g or during acceleration
N Move the choke knob to < and
continue cranking until the engine
runs.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
English
1
295BA074 KN
2
3
295BA075 KN
2
5
1
296BA026 KN
22
296BA027 KN
3
4
Cleaning the Air Filter
Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
Different Air Filters
Different models are equipped with
different air filters. The models can be
identified by the filter housing and the air
filter itself.
Version with Flat Filter Material
N Turn the filter cover lock (1)
counterclockwise to the vertical
position.
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter.
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
N Pull off the retainer (3) and take the
air filter element (4) out of the filter
housing (5).
N Replace the filter element. As a
temporary measure you can knock it
out on the palm of your hand or blow
it out with compressed air – do not
wash.
Replace any damaged parts.
Installing the filter element
N Fit the filter (4) in the filter
housing (5) and push the
retainer (3) into position.
N Refit the filter cover (2) and turn the
filter cover lock clockwise to the
horizontal position.
Version with Pleated Filter Material
N Unscrew the filter cover lock (1)
counterclockwise.
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter.
N Take the air filter (3) out of the filter
housing (4).
Cleaning the air filter
N Carefully knock the filter out on the
palm of your hand or blow it clear
with compressed air from the inside
outwards.
In case of stubborn dirt or sticky filter
fabric
N Wash the air filter in STIHL special
cleaner (special accessory) or a
clean, non-flammable solution (e.g.
warm soapy water). Rinse the filter
21
English
0000-GXX-7919-A0
from the inside outwards under a jet
of water – do not use a pressure
washer.
N Dry the filter – do not expose to high
temperatures.
Place the filter in position.
N Install the filter element in the filter
housing.
N Fit the filter cover and tighten the
filter cover lock clockwise.
Engine Management Adjusting the Carburetor
Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.
Adjusting Idle Speed
Engine stops while idling
N Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly.
22
BG 56, BG 56 C, BG 66, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C
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