STIHL MM 56
Instruction Manual
Contents
English
MultiSystem 2
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved MultiTools 7
Adjusting the bicycle handle 8
Fuel 8
Fueling 9
Original Instruction ManualPrinted on chlorine-free paper
Starting / Stopping the Engine 10
Extra weight 12
Wheels 13
Operating Instructions 14
Replacing the Air Filter 14
Adjusting the Carburetor 15
Spark Arresting Screen in Muffler 15
Spark Plug 16
Engine Running Behavior 17
Storing the Machine 17
Maintenance and Care 18
Minimize Wear and Avoid Damage 19
Main Parts 20
Specifications 21
Printing inks contain vegetable oils, paper can be recycled.
Maintenance and Repairs 22
Disposal 22
EC Declaration of Conformity 23
UKCA Declaration of Conformity 23
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It has been built using modern
production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and trouble-free use of
the product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
© ANDREAS STIHL AG & Co. KG, 2021
0458-489-0121-B. VA0.H21.
0000008008_005_GB
MM56
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
MultiSystem
+
+
In the STIHL MultiSystem a number of
different MultiEngines and MultiTools
can be combined to produce a power
tool. In this instruction manual the
functional unit formed by the
MultiEngine and MultiTool is referred to
as the power tool.
Therefore, the separate instruction
manuals for the MultiEngine and
MultiTool should be used together for
the power tool.
Always read and and make sure you
understand both instruction manuals
before using your power tool for the first
time and keep them in a safe place for
future reference.
Guide to Using this Manual Safety Precautions and
Working Techniques
Pictograms
All the pictograms attached to the
machine are shown and explained in this
manual.
Symbols in text
WARNING
Warning where there is a risk of an
accident or personal injury or serious
damage to property.
NOTICE
0000-GXX-5897-A0
Caution where there is a risk of
damaging the machine or its individual
components.
Engineering improvements
STIHL's philosophy is to continually
improve all of its products. For this
reason we may modify the design,
engineering and appearance of our
products periodically.
Therefore, some changes, modifications
and improvements may not be covered
in this manual.
Observe all applicable local safety
regulations, e.g. by trade organizations,
social insurance institutions, labor safety
authorities etc.
If you have never used a power tool
before: Have your dealer or other
experienced user show you how to
operate your machine – or attend a
special course to learn how to operate it.
Minors should never be allowed to use
the machine – except for apprentices
over the age of 16 when working under
supervision.
Children, animals and bystanders must
remain at a distance.
When not using the machine, it must be
laid down in such a way that it does not
endanger anyone. Ensure that the
machine cannot be used without
authorization.
Special safety precautions must be observed
when operating a power
tool.
Always read and and
make sure you understand both user manuals
(MultiEngine and
MultiTool) before using
your power tool for the
first time and keep them
in a safe place for future
reference. Non-compliance with the user
manuals may cause serious or even fatal injury.
2
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The user is responsible for accidents or
risks involving third parties or their
property.
Lend or rent your power tool only to
persons who are familiar with this model
and its operation – do not lend of rent
your power tool without the MultiEngine
and MultiTool user manuals.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
Anyone operating the machine must be
well rested, in good physical health and
in good mental condition.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
machine.
Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. STIHL
recommends that persons with
pacemakers consult their physician and
the pacemaker manufacturer to reduce
any health risk.
Anyone who has consumed alcohol or
drugs or medicines affecting their ability
to react must not operate a power tool.
Use your power tool only for the
applications described in the user
manual of the MultiTool you are using.
The machine must not be used for any
other purposes – risk of accidents!
Do not operate the MultiEngine without a
properly mounted MultiTool since this
may result in damage to the machine.
Only use MultiTools and accessories
that are explicitly approved for this
power tool by STIHL or are technically
identical. It is important that you read the
chapter on "Approved MultiTools". If you
have any questions in this respect,
consult your dealer. Use only high
quality parts and accessories. in order to
avoid the risk of accidents and damage
to the machine.
STIHL recommends the use of original
STIHL tools and accessories. They are
specifically designed to match the
product and meet your performance
requirements.
Never attempt to modify your power tool
in any way since this may increase the
risk of personal injury. STIHL excludes
all liability for personal injury and
damage to property caused while using
unauthorized attachments.
Do not use a high-pressure washer to
clean the power tool. The solid jet of
water may damage parts of the unit.
Clothing and equipment
Wear proper protective clothing and
equipment.
Do not wear clothing which could
become trapped in wood, brush or
moving parts of the machine. Do not
wear a scarf, necktie or jewelry. Tie up
and confine long hair above your
shoulders.
Wear steel-toed safety
boots with non-slip soles.
WARNING
To reduce the risk of eye
injuries, wear close-fitting safety glasses in
accordance with European Standard EN 166.
Make sure the safety
glasses are a snug fit.
Wear "personal" sound protection, e.g.
ear defenders.
Wear face protection and make sure it is
a good fit. Face protection alone is not
sufficient to protect the eyes.
See also notes on "Clothing and
Equipment" in the user manual of the
MultiTool you are using.
Transporting the machine
0000-GXX-0550-A0
Always stop the engine.
Transport the machine by the handle or
loop handle, working tool facing forward.
Never touch hot parts – risk of burns!
The power tool can turn over or move
while being transported. Persons may
be injured or property damaged. Secure
the power tool with lashing straps or a
net to prevent it turning over and
moving. Allow the power tool to cool
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English
down before transporting it by vehicle.
Position the power tool so that no fuel
can escape.
See also notes on "Transporting the
Power Tool" in the user manual of the
MultiTool you are using.
Refueling
Gasoline is highly flammable – keep away from
fire or flame – do not spill
any fuel – no smoking.
Always shut off the engine before
refueling.
Do not fuel a hot engine – fuel may spill
and cause a fire.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.
Only refuel the machine in a well
ventilated place. If fuel has been spilled,
immediately clean the machine – do not
allow your clothes to be splashed with
fuel. If that happens, change your
clothes at once.
After fueling, tighten
down the screw-type fuel
cap as securely as
possible.
This helps reduce the risk of engine
vibrations causing an incorrectly
tightened fuel cap to loosen or come off
and spill fuel.
Check for fuel leakage!
Never start the engine if
fuel has been spilled or is
leaking – Fatal burns may
result!
Before starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the User
Manuals:
– Check the fuel system for leaks,
especially the visible parts, e. g.,
fuel cap, hose connections, manual
fuel pump (only in machines with a
manual fuel pump). In case of
leakage and damage, do not start
the engine – risk of fire! Have the
machine serviced by a dealer
before using it
– Use only an approved combination
of attachment and deflector. All
parts must be assembled properly
and securely.
– The stop switch must be easy to
push
– Smooth action of throttle trigger
lockout and throttle trigger – the
throttle trigger must return
automatically to the idle position
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Do not make any changes to the
controls or the safety devices
– Keep the handles dry and clean –
free from oil and dirt – for safe
control of the power tool.
– Swing the bike handle to the normal
operating position and tighten it
down firmly with the rotary knob.
See "Adjusting the Bike Handle".
To reduce the risk of personal injury, do
not operate your power tool if it is
damaged or not properly assembled!
See also notes on "Before Starting" in
the user manual of the MultiTool you are
using.
Check the position of the gearbox for the
MultiTool you have mounted and correct
it if necessary. This helps reduce the risk
of injury from the MultiTool rotating in the
wrong direction.
See "Mounting the MultiTool" in the user
manual of the MultiTool you are using.
If you use metal tools, position the
gearbox so that the axle is below the
drive shaft.
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469BA045 KN
5m (16ft)
Use this position for:
– BF-MM cultivator
– BK-MM bolo tines
– FC-MM edger
– RL-MM aerator
– MF-MM dethatcher
If you use sweeping attachments,
position the gearbox so that the axle is
above the drive shaft.
Use this position for:
– KB-MM bristle brush
– KW-MM sweeper drum assembly
Starting the engine
Start the engine at least 3 meters from
the fueling spot, outdoors only.
Place the power tool on firm ground in
an open area. Make sure you have good
balance and secure footing. Hold the
power tool securely. The attachment
must be clear of the ground and all other
obstructions because it may begin to run
when the engine starts.
Your power tool is for operation by one
person only. To reduce the risk of injury
from contact with the rotating tool, do not
allow other persons within a radius of 5
meters of your own position – even when
starting.
The tool begins to rotate
as soon as the engine is
started in the "Start" position. Always stand to one
side of the machine when
starting – never in front of
the tools. To reduce the
risk of injury, avoid contact with the working tool.
Do not drop-start the power tool – start
the engine as described in the User
Manual. Note that the attachment
continues to run for a short period after
you let go of the throttle trigger –
flywheel effect.
Check idle speed setting: The
attachment must be stationary when the
engine is idling with the throttle trigger
released.
Keep easily combustible materials
(e. g., wood chips, bark, dry grass, fuel)
away from hot exhaust gases and hot
muffler surfaces – risk of fire!
See also notes on "Starting / Stopping
the Engine" in the user manual of the
MultiTool you are using.
Holding and Controlling the Power Tool
Make sure you always have good
balance and secure footing.
Always hold the unit firmly with both
hands on the handles.
Right hand on control handle, left hand
on grip on handlebar.
While working
In the event of impending danger or in
an emergency, switch off the engine
immediately by pressing the stop switch.
To reduce the risk of injury from contact
with the tool and ejected objects, do not
allow any other persons within a radius
of 5 meters of your own position.This
distance must also be maintained in
relation to objects (vehicles, window
panes) – risk of property damage!
The correct engine idle speed is
important to ensure that the attachment
stops moving when you let go of the
throttle trigger. If the working tool
continues to move when the engine is
idling, have your dealer check the
machine and make proper adjustments
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or repairs. Check and correct the idle
speed setting at regular intervals. STIHL
recommends you have this work done
by a STIHL servicing dealer.
Do not operate your power tool in the
starting throttle position – engine speed
cannot be controlled in this position.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Take breaks when you start getting tired
or feeling fatigue – risk of accidents!
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Proceed with caution, do not put
others in danger.
Use your power tool only for those
applications described in the MultiTool
user manual.
As soon as the engine is
running, the power
machine generates toxic
exhaust gas. These
gases may be odorless
and invisible and may
contain unburned hydrocarbons and benzene.
Never run the engine
indoors or in poorly ventilated locations, even if
your model is equipped
with a catalytic converter.
To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.
Stop work immediately if you start
suffering from nausea, headaches,
impaired vision (e.g. your field of vision
gets smaller), impaired hearing,
dizziness, or impaired concentration –
these symptoms may possibly be the
result of too-high exhaust gas
concentration – Risk of accidents!
Operate your power tool so that it
produces a minimum of noise and
emissions – do not run the engine
unnecessarily, accelerate the engine
only when working.
To reduce the risk of fire, do not smoke
while operating or standing near your
power tool. Combustible fuel vapor may
escape from the fuel system.
Dust, fumes and smoke produced while
working may be hazardous to health!
Wear respiratory protection in case of
heavy dust or smoke emission.
Never touch hot parts – risk of burns!
Keep your hands and feet
well away from the working tool. To reduce the
risk of injury, never touch
a rotating tool. Always
stand behind the deflector or to one side of the
machine during operation – never in front of the
rotating tools.
If your power 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 – see also
"Before Starting". Check in particular
that the fuel system has no leaks and the
safety equipment is fully operative.
Never use a power tool that is no longer
safe to operate. In case of doubt, contact
a dealer.
To reduce the risk of injury, shut off the
engine before changing the attachment.
After finishing work or before leaving the
power tool unattended: Shut off the
engine.
See also notes on "During Operation" in
the user manual of the MultiTool you are
using.
Vibrations
Prolonged use of the power tool may
result in vibration-induced circulation
problems in the hands (whitefinger
disease).
No general recommendation can be
given for the length of usage because it
depends on several factors.
The period of usage is prolonged by:
– Hand protection (wearing warm
gloves)
– Work breaks
The period of usage is shortened by:
– Any personal tendency to suffer
from poor circulation (symptoms:
frequently cold fingers, tingling
sensations).
– Low outside temperatures.
– The force with which the handles
are held (a tight grip restricts
circulation).
Continual and regular users should
monitor closely the condition of their
hands and fingers. If any of the above
6
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469BA025 KN
BF-MM
BK-MM
RL-MM
FC-MM
KB-MMKW-MM
MF-MM
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.
Maintenance and Repairs
Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the instruction manual.
Have all other work performed by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
Only use high-quality replacement parts
in order to avoid the risk of accidents
and damage to the machine. If you have
any questions in this respect, consult a
servicing dealer.
STIHL recommends the use of genuine
STIHL replacement parts. These parts
are specifically designed to match your
machine model and meet your
performance requirements.
To reduce the risk of injury from
unintentional engine startup, always
shut off the engine and disconnect the
spark plug boot before performing any
repairs, maintenance or cleaning work. –
Exception: Carburetor and idle speed
adjustments.
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed since there is otherwise a
risk of fire from uncontained sparking.
To reduce the risk of fire, do not service
or store your machine near open flames.
MM56
Check the fuel filler cap for leaks at
regular intervals.
Use only a spark plug of the type
approved by STIHL and make sure it is
in good condition – see "Specifications".
Inspect the ignition lead (insulation in
good condition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to
hearing, do not operate your machine if
the muffler is damaged or missing.
Do not touch a hot muffler since burn
injury will result.
Approved MultiTools
The following STIHL MultiTools may be
mounted on the MultiEngine:
MultiTool Application
BF-MM Pick tines
BK-MM Bolo tines
RL-MM Aerator
FC-MM Edger
MF-MM Dethatcher
KW-MM PowerSweep
KB-MM Bristle brush
7
English
0000-GXX-0549-A1
1
Adjusting the bicycle handle
N Loosen the knob (1).
N Swing the bicycle handle with both
hands into the working position (as
far as stop).
N Tighten down the knob firmly.
Fuel
Your engine requires a mixture of
gasoline and engine oil.
WARNING
For health reasons, avoid direct skin
contact with gasoline and avoid inhaling
gasoline vapor.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. This ready-to-use fuel mix
contains no benzol or lead, has a high
octane rating and ensures that you
always use the right mix ratio.
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil for an extra long
engine life.
MotoMix is not available in all markets.
Mixing Fuel
Gasoline with an ethanol content of
more than 10% can cause running
problems in engines with a manually
adjustable carburetor and should not be
used in such engines.
Engines equipped with M-Tronic deliver
full power when run on gasoline with an
ethanol content of up to 25% (E25).
Engine Oil
If you mix the fuel yourself, use only
STIHL two-stroke engine oil or another
high-performance engine oil in
accordance with JASO FB, JASO FC,
JASO FD, ISO-L-EGB, ISO-L-EGC or
ISO-L-EGD.
STIHL specifies STIHL HP Ultra twostroke engine oil or an equivalent highperformance engine oil in order to
maintain emission limits over the
machine’s service life.
Mix Ratio
STIHL 50:1 two-stroke engine oil: 50
parts gasoline to 1 part oil
Examples
NOTICE
Unsuitable fuels or lubricants or mix
ratios other than those specified may
result in serious damage to the engine.
Poor quality gasoline or engine oil may
damage the engine, sealing rings, hoses
and the fuel tank.
Gasoline
Use only high-quality brand-name
gasoline with a minimum octane rating
of 90 – leaded or unleaded.
8
Gasoline STIHL engine oil 50:1
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
N Use a canister approved for storing
fuel. Pour oil into canister first, then
add gasoline and mix thoroughly.
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547BA045 KN
002BA447 KN
002BA448 KN
Storing Fuel
Store fuel only in approved safety-type
fuel canisters in a dry, cool and safe
location protected from light and the sun.
Fuel mix ages – only mix sufficient fuel
for a few weeks work. Do not store fuel
mix for longer than 30 days. Exposure to
light, the sun, low or high temperatures
can quickly make the fuel mix unusable.
STIHL MotoMix may be stored for up to
2 years without any problems.
N Thoroughly shake the mixture in the
canister before fueling your
machine.
WARNING
Pressure may build up in the canister –
open it carefully.
N Clean the fuel tank and canister
from time to time.
Dispose of remaining fuel and cleaning
fluid properly in accordance with local
regulations and environmental
requirements.
Fueling
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.
Opening screw-type tank cap
Filling up with fuel
Take care not to spill fuel while fueling
and do not overfill the tank. STIHL
recommends you use the STIHL filler
nozzle (special accessory).
Closing screw-type tank cap
N Place the cap in the opening.
N Turn the cap clockwise as far as
stop and tighten it down as firmly as
possible by hand.
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N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the cap.
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English
0000-GXX-0545-A0
Starting / Stopping the
Engine
Controls
3
2
1
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop
positions. Depress the stop switch
(…) to switch off the ignition – see
"Function of Stop Switch and
Ignition System".
Starting the Engine
N Swing bicycle handle into working
position – see "Adjusting the Bicycle
Handle"
4
N Depress the manual fuel pump
bulb (4) at least five times – even if
the bulb is filled with fuel.
Cold engine (cold start)
0000-GXX-0538-A0
5
N Depress the choke knob (5) and
turn it to g at the same time.
Warm engine (warm start)
5
N Depress in the choke knob (5) and
turn it to < at the same time.
Also use this setting if the engine has
0000-GXX-0540-A0
been running but is still cold.
Cranking
N Retract the wheels, if fitted.
0000-GXX-0539-A0
N Put the unit on the ground: It must
rest securely on the engine flange
and the support on the frame.
Check that the MultiTool is not
touching the ground or any other
0000-GXX-0541-A0
Function of Stop Switch and Ignition
System
The ignition is switched off and the
engine stopped when the stop switch is
depressed. The stop switch returns
automatically to the Run position when it
is released: The ignition is switched on
again after the engine stops – the engine
is then ready to start.
10
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obstacles – see also "Starting /
Stopping the Engine" in the
MultiTool instruction manual.
N Make sure you have secure footing
– as shown. To reduce the risk of
injury from contact with rotating
attachments, always stand to the
side of the power tool.
N With your left hand on the carrying
handle, press the unit firmly against
the ground.
NOTICE
Do not stand or kneel on the shaft.
N Hold the starter grip with your right
hand.
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.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
As soon as the engine runs
N Press down the throttle trigger
lockout and open the throttle – the
choke knob moves to the run
position F. After a cold start, warm
up the engine by opening the
throttle several times.
WARNING
Make sure the carburetor is correctly
adjusted. The MultiTool must not rotate
when the engine is idling.
0000-GXX-0546-A0
Your machine is now ready for
operation.
Stopping the Engine
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Other Hints on Starting
Engine stalls in cold start position g or
under acceleration.
N Move the choke knob to < and
continue cranking until the engine
runs.
Engine does not start in warm start
position <
N Move the choke knob to g and
continue cranking until the engine
runs.
0000-GXX-0542-A0
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Engine is flooded
N Move the choke knob to F and
continue cranking until the engine
runs.
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469BA053 KN
1
2
3
4
5
6
469BA054 KN
1
2
3
4
5
Fuel tank run until completely dry
N After refueling, depress the manual
fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
N Set the choke knob to suit the
engine temperature.
N Now start the engine.
Extra weight
An extra weight (special accessory) may
be retrofitted on the MultiEngine to
increase the weight on the MultiTool.
Use only original STIHL weights. The
use of other weights parts may result in
damage to the machine or personal
injury.
Mounting the extra weight
MultiEngine without wheels
Use the combination wrench to unscrew
and retighten the weights.
Unscrew weights on the side without
square end – as follows:
N Push the extra weight (1) with bolt
through the bore (6) in the flange,
turning it until the square end (2)
engages the recess in the flange.
N Screw the inner weight (5) onto the
bolt and tighten it down firmly.
N Screw the outer weight (4) with the
hex head screw (3) into the thread
of the inner weight and tighten it
down firmly.
One of two weights may be mounted on
each side of the extra weight as
required.
Weight on each
side
12kg
24kg
Total extra weight
The weights (1) on the side with the
square end (2) remain on the bolt.
N Take out the hex head screw (3)
and remove the outer weight (4).
N Loosen the inner weight (5) and
remove it from the bolt.
12
NOTICE
The maximum allowable extra weight is
4 kg. Never use a heavier extra weight
as this may damage the machine.
MultiEngine with wheels
If the MultiEngine is already equipped
with wheels (special accessory), see
chapter on "Wheels", additional parts
are required to mount the extra weights.
In such a case have the extra weight
mounted by your servicing dealer.
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3
6
469BA035 KN
2
4
1
7
7
5
3
1
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
Wheels
For convenient transport, the
MultiEngine can be retrofitted with a set
of wheels (special accessory).
Always use original STIHL wheels.
Using other wheels can lead to damage
to the machine and personal injuries.
Installing wheels
No additional weight is attached to the
MultiEngine
To simplify installation, turn the machine
so that it rests on the handles.
N Insert the bolt (2) with the
washer (3) through the hole (4) in
the flange
N Fit the washer (3) and tighten it
down with the nut (5)
N Fasten the notched plate (6) to the
frame with the screws (7) in the
threaded holes – in the process,
push the notched plate toward the
handle
N The wheels must fold down
automatically in working position; if
necessary, loosen the nut (5) by a
quarter turn
Additional weight is attached to the
MultiEngine
If additional weight (special accessory) –
see "Additional weight" – is already
attached to the MultiEngine, then
additional parts are required in order to
install wheels.
In this case, have the wheels installed by
a servicing dealer.
STIHL recommends that maintenance
and repair work be carried out only by
authorized STIHL dealers.
Folding the wheels in and out
The wheels can be locked in various
positions.
If the wheels are not needed during
N Insert the two sleeves (1) in the
frame
N Push the frame onto the flange
work, fold in the wheels.
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English
8
469BA036 KN
Operating Instructions Replacing the Air Filter
N Loosen knob (8)
N Engage knob in the desired working
position and tighten it
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
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".
If There is a Noticeable Loss of Engine
Power
5
4
3
2
1
N Move the choke lever (1) to <.
N Loosen the screws (2).
N Remove the filter cover (3).
N Clean away loose dirt from around
the filter.
N Remove the filter element (4).
N Replace dirty or damaged filter
element (4).
Replacing the filter element
N Install the filter element (4) in the
filter housing (5) and fit the cover.
N Insert the screws (2) and tighten
them down firmly.
0000-GXX-0543-A0
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0000-GXX-0544-A0
1
0000-GXX-0145-A0
Adjusting the Carburetor
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 Warm up the engine for about
3 minutes.
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the MultiTool must
not run.
MultiTool runs when the engine is idling
N Turn the idle speed screw (LA)
counterclockwise until the MultiTool
stops moving and then turn the
screw about another 1/2 to 3/4 turn
in the same direction.
WARNING
If the MultiTool continues to run when
the engine is idling, have your machine
checked and repaired by your servicing
dealer.
Spark Arresting Screen in
Muffler
WARNING
To reduce the risk of fire caused by hot
particles escaping from the machine,
never operate the machine without a
spark arresting screen, or with the spark
arresting screen damaged. Do not
modify the muffler or spark arresting
screen.
NOTICE
According to the law or regulations in
some countries or federal states, certain
operations may only be carried out if a
properly serviced spark arresting screen
is provided.
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 Use the combination wrench to
unscrew the connector
N Clean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one
N Insert the connector and tighten it
down firmly with the combination
wrench
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3
1
4907BA014 KN
000BA039 KN
A
1
000BA045 KN
4907BA016 KN
1
Spark Plug
N If the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
N Fit a new spark plug after about 100
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the Spark Plug
N Shut off the engine.
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
caused fouling of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
N Use resistor type spark plugs with a
properly tightened adapter nut.
Installing the spark plug
N Screw the spark plug into the
cylinder.
N Press the boot firmly onto the spark
plug.
N Push the cap (1) on to the spark
plug boot as far as stop.
The spark plug boot (2) is under the
cap (1).
WARNING
The cap (1) protects the spark plug boot
from damage. Do not operate the
machine without a cap – replace a
damaged cap.
N Remove the cap (1).
N Pull off the spark plug boot (2).
N Allow the spark plug (3) to cool
down.
N Unscrew the spark plug (3).
16
WARNING
Arcing may occur if the adapter nut (1) is
loose or missing. Working in an easily
combustible or explosive atmosphere
may cause a fire or an explosion. This
can result result in serious injuries or
damage to property.
MM56
Engine Running Behavior Storing the Machine
0000-GXX-0551-A0
English
If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor is properly
adjusted, the cause may be the muffler.
Have the muffler checked for
contamination (carbonization) by your
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
For periods of about 3 months or longer
N Drain and clean the fuel tank in a
well ventilated area.
N Dispose of fuel properly in
accordance with local
environmental requirements.
N Run the engine until the carburetor
is dry – this helps prevent the
carburetor diaphragms sticking
together.
N Thoroughly clean the machine – pay
special attention to the cylinder fins
and air filter.
N Remove, clean and inspect the
attachment.
N Store the machine in a dry and
secure location Keep out of the
reach of children and other
unauthorized persons.
Fold the handle down and hang up the
machine by the handle support.
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Maintenance and Care
The following intervals apply for normal operating conditions. The specified intervals
must be shortened accordingly when working for longer than normal or under difficult
cutting conditions (extensive dust, etc.).
Before starting work
At the end of work and/or
daily
Whenever tank is refilled
Weekly
Monthly
Annually
If faulty
If damaged
As required
Complete machine
Control handle Function test XX
Air filter
Manual fuel pump (if present)
Fuel pickup body in fuel tank
Fuel tank Clean XX
Carburetor
Spark plug
Intake port for cooling air
Spark arresting screen in muffler
All accessible screws, nuts and bolts (not
adjusting screws)
Safety information label replace X
1)
STIHL recommends STIHL dealers
Visual inspection (condition, leaks) XX
Clean X
Clean XX
replace X
check X
Have repaired by a specialist dealer
check X
Have replaced by servicing dealer
Check idle adjustment, the work tool
must not turn
Readjust idle speed X
Adjust electrode gap X
Replace after every 100 hours of
operation
Visual inspection X
Clean X
Check if installed X
Check or replace
Tighten X
1)
1)
1)
XX
XXX
X
X
18
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Minimize Wear and Avoid
Damage
Observing the instructions in this manual
helps reduce the risk of unnecessary
wear and damage to the power tool.
The power tool must be operated,
maintained and stored with the due care
and attention described in this owner's
manual.
The user is responsible for all damage
caused by non-observance of the safety
precautions, operating and maintenance
instructions in this manual. This includes
in particular:
– Alterations or modifications to the
product not approved by STIHL.
– Using tools or accessories which
are neither approved or suitable for
the product or are of a poor quality.
– Using the product for purposes for
which it was not designed.
– Using the product for sports or
competitive events.
– Consequential damage caused by
continuing to use the product with
defective components.
Maintenance Work
All the operations described in the
"Maintenance Chart" must be performed
on a regular basis. If these maintenance
operations cannot be performed by the
owner, they should be performed by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
If these maintenance operations are not
carried out as specified, the user
assumes responsibility for any damage
that may occur. Among other parts, this
includes:
– Damage to the engine due to
neglect or deficient maintenance
(e.g. air and fuel filters), incorrect
carburetor adjustment or
inadequate cleaning of cooling air
inlets (intake ports, cylinder fins).
– Corrosion and other consequential
damage resulting from improper
storage.
– Damage to the machine resulting
from the use of poor quality
replacement parts.
Parts Subject to Wear and Tear
Some parts of the power tool are subject
to normal wear and tear even during
regular operation in accordance with
instructions and, depending on the type
and duration of use, have to be replaced
in good time. Among other parts, this
includes:
– Clutch
– Filters (air, fuel)
– Rewind starter
– Spark plug
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8
7
6
9
12
22
3
10
21
18
17
0000-GXX-0547-A0
11
13
14
15
16
#
19
2
1
15
20
23
24
4
14
Main Parts
1 Choke knob
2 Carburetor adjusting screw
3 Spark plug boot
4 Cap
5 Air filter cover
6 Stop switch
7 Throttle trigger lockout
8 Control handle
9 Throttle trigger
10 Left handle
11 Handlebar
12 Knob
13 Loop handle
14 Throttle cable retainer
15 Carrying handle
16 Deflector
17 Gearbox
18 Axle
19 Hitch pin
20 Fuel tank
21 Tank cap
22 Manual fuel pump
23 Starter grip
24 Muffler with spark arresting screen
# Serial Number
20
MM56
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Specifications
Engine
Single cylinder two-stroke engine
Displacement: 27.2 cc
Bore: 34 mm
Stroke: 30 mm
Engine power to
ISO 8893:
Idle speed: 2,800 rpm
Cut-off speed: 8,900 rpm
Max. output shaft
speed (working tool): 200 rpm
Ignition System
Electronic magneto ignition
Spark plug (resistor
type):
Electrode gap: 0.5 mm
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity: 330 cc (0.33 l)
Weight
Dry, without MultiTool attachment
8.3 kg
0.85 kW
(1.2 bhp) at
7,500 rpm
NGK CMR 6 H,
BOSCH USR 4A
C
Noise and Vibration Data
For further details on compliance with
Vibration Directive 2002/44/EC visit
www.stihl.com/vib.
MultiEngine with MultiTool
Version of MultiTools – see "Approved
MultiTools".
BF-MM and BK-MM
Noise and vibration data are measured
at idling and nominal operating speed in
a ratio of 1:6.
Sound pressure level L
to EN 709
peq
87 dB(A)
Sound power level L
to EN 709
w
96 dB(A)
Vibration level a
BF-MM: 3.8 m/s
BK-MM: 3.7 m/s24.0 m/s
to EN 709
hv,eq
Handle,
left
2
Handle,
right
4.4 m/s
2
2
FC-MM
Noise and vibration data is measured at
idling and nominal operating speed in a
ratio of 1:1.
Sound pressure level L
to ISO 11789
p
91 dB(A)
Sound power level L
to ISO 11789
w
100 dB(A)
Vibration level a
FC-MM 4.1 m/s
to EN 11789
hv,eq
Handle,
left
2
Handle,
right
5.1 m/s
2
KB-KM, KW-KM
Noise and vibration data is measured at
idling and nominal operating speed in a
ratio of 1:1.
Sound pressure level L
to ISO 11201
p
94 dB(A)
Sound power level L
to
w
EN ISO 118061
102 dB(A)
Vibration level a
KB-MM: 4.0 m/s
KW-MM: 4.0 m/s24.1 m/s
to ISO 20643
hv,eq
Handle,
left
2
Handle,
right
4.1 m/s
2
2
MF-MM and RL-MM
Noise and vibration data is measured at
idling and nominal operating speed in a
ratio of 1:1.
Sound pressure level L
to EN 13684
peq
MF-MM: 94 dB(A)
RL-MM: 93 dB(A)
Sound power level L
to EN 13684
w
MF-MM: 101 dB(A)
RL-MM: 102 dB(A)
MM56
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000BA073 KN
Vibration level a
MF-MM: 4.1 m/s
RL-MM: 4.1 m/s24.5 m/s
to EN 13864
hv,eq
Handle,
left
2
Handle,
right
4.5 m/s
2
2
The K-factor in accordance with
Directive 2006/42/EC is 2.0 dB(A) for
the sound pressure level and sound
power level; the K-factor in accordance
with Directive 2006/42/EC is 2.0 m/s
2
for the vibration level.
REACH
REACH is an EC regulation and stands
for the Registration, Evaluation,
Authorisation and Restriction of
Chemical substances.
For information on compliance with the
REACH regulation (EC) No. 1907/2006
see www.stihl.com/reach.
Exhaust Emissions
The CO2value measured in the EU type
approval procedure is specified at
www.stihl.com/co2.
The measured CO
value was
2
determined on a representative engine
in accordance with a standardized test
procedure under laboratory conditions
and does not represent either an explicit
or implied guarantee of the performance
of a specific engine.
The applicable exhaust emission
requirements are fulfilled by the
intended usage and maintenance
described in this instruction manual. The
type approval expires if the engine is
modified in any way.
Maintenance and Repairs Disposal
Users of this machine may only carry out
the maintenance and service work
described in this user manual. All other
repairs must be carried out by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
When repairing the machine, only use
replacement parts which have been
approved by STIHL for this power tool or
are technically identical. Only use highquality replacement parts in order to
avoid the risk of accidents and damage
to the machine.
STIHL recommends the use of original
STIHL replacement parts.
Original STIHL parts can be identified by
the STIHL part number, the {
logo and the STIHL parts symbol K
(the symbol may appear alone on small
parts).
Observe all country-specific waste
disposal rules and regulations.
STIHL products must not be thrown in
the garbage can. Take the product,
accessories and packaging to an
approved disposal site for environmentfriendly recycling.
Contact your STIHL servicing dealer for
the latest information on waste disposal.
22
MM56
English
EC Declaration of Conformity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare under our sole responsibility that
Designation: MultiEngine
Make: STIHL
Series: MM 56
Serial identification
number: 4604
Displacement: 27.2cm
conforms to the relevant provisions of
Directives 2011/65/EU, 2006/42/EC and
2014/30/EU and has been developed
and manufactured in compliance with
the following standards in the versions
valid on the date of production:
EN ISO 12100, EN 55012,
EN 61000-6-1 (in conjunction with the
specified MultiTools BF-MM, BK-MM,
RL-MM, FC-MM, MF-MM, KB-MM,
KW-MM)
The MultiEngine described here may be
operated only in conjunction with the
MultiTools approved by STIHL for use
with this MultiEngine.
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
Produktzulassung
The year of manufacture and serial
number are applied to the product.
3
Done at Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification &
Regulatory Affairs
UKCA Declaration of
Conformity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare under our sole responsibility that
Designation: MultiEngine
Make: STIHL
Series: MM 56
Serial identification
number: 4604
Displacement: 27.2cm
complies with the relevant provisions of
the UK regulations The Restriction of the
Use of Certain Hazardous Substances
in Electrical and Electronic Equipment
Regulations 2012, Supply of Machinery
(Safety) Regulations 2008, and
Electromagnetic Compatibility
Regulations 2016 and has been
developed and manufactured in
accordance with the versions of the
following standards valid on the date of
manufacture:
EN ISO 12100, EN 55012,
EN 61000-6-1 (in conjunction with the
specified MultiTools BF-MM, BK-MM,
RL-MM, FC-MM, MF-MM, KB-MM,
KW-MM)
The MultiEngine described here may be
operated only in conjunction with the
MultiTools approved by STIHL for use
with this MultiEngine.
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
3
MM56
23
English
The year of manufacture and serial
number are indicated on the product.
Done at Waiblingen, 15.07.2021
ANDREAS STIHL AG & Co. KG
pp
Dr. Jürgen Hoffmann
Director Product Certification &
Regulatory Affairs
24
MM56
0458-489-0121-B
englisch
G
www.stihl.com
*04584890121B*
0458-489-0121-B
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