Stihl MM 56 User manual

STIHL MM 56 Instruction Manual
Notice d’emploi

GInstruction Manual
1 - 23
FNotice d’emploi
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Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2022 0458-489-8221-B. VA0.D22. 0000008147_003_GB
MM 56 C
English
1
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
Contents
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
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
Starting / Stopping the Engine 10
Extra weight 12
Wheels 13
Operating Instructions 14
Replacing the Air Filter 14
Engine Management 15
Adjusting the Carburetor 15
Spark Plug 15
Engine Running Behavior 16
Storing the Machine 17
Maintenance and Care 18
Main Parts 19
Specifications 20
Maintenance and Repairs 20
Disposal 21
STIHL Limited Emission Control
Warranty Statement 21

MM 56 C
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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.
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
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 employers' liability
insurance associations, social insurance
systems, occupational 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 motorized device – except for
apprentices over the age of 16 when
working under supervision.
Children, animals and onlookers must
remain at a safe distance.
MultiSystem
+
+
0000-GXX-5900-A0
Guide to Using this Manual Safety Precautions and
Working Techniques
Special safety precau-
tions must be observed
when operating a power
tool.
Always read and and
make sure you under-
stand 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-compli-
ance with the user
manuals may cause seri-
ous or even fatal injury.

MM 56 C
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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.
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 or 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 a good state of mind.
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
minimize any health risk.
Anyone who has consumed alcohol,
medications or drugs that impair 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 accident!
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 genuine
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 secure long hair above your
shoulders.
WARNING
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
Always stop the engine.
Transport the machine by the handle or
loop handle, working tool facing forward.
Never touch hot parts – risk of burns!
Wear steel-toed safety
boots with non-slip soles.
To reduce the risk of eye
injuries, wear close-fit-
ting safety glasses in
accordance with Euro-
pean Standard EN 166.
Make sure the safety
glasses are a snug fit.
0000-GXX-0550-A0

MM 56 C
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4
The power tool can turn over or move
while being transported. Persons may
be injured or property may be damaged.
Secure the power tool with lashing
straps or a net to prevent it turning over
and moving. Allow the power tool to cool
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
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 to prevent fuel spraying out.
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.
This helps reduce the risk of engine
vibrations causing an incorrectly
tightened fuel cap to loosen or come off
and spill fuel.
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".
The power tool must only be operated
when it is in good operating condition –
Risk of accident!
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 "Installing the MultiTool" in the User
Manual of the MultiTool you are using.
Arrows on the rotor blades show the
direction of rotation. The arrows on the
rotor blades must point in the same
direction as the arrows on the gear.
Gasoline is highly flam-
mable – keep away from
fire or flame – do not spill
any fuel – no smoking.
After fueling, tighten
down the screw-type fuel
cap as securely as
possible.
Check for fuel leakage!
Never start the engine if
fuel has been spilled or is
leaking – fatal burns may
result!
Ensure that the gear unit
and the rotor blades are
correctly attached and
aligned and avoid contact
with the rotor blades - risk
of injury!

MM 56 C
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5
If you use metal tools, position the
gearbox so that the axle is below the
drive shaft.
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
To use MultiTools for mowing grass,
trimming and thinning out, remove the
gearbox.
Use this position for:
–Clearing saw FS-MM
Starting the engine
Start the engine at least 3 meters from
the refueling spot and only outdoors.
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.
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 a firm 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 work tool
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
or repairs. Check and correct the idle
The tool begins to rotate
as soon as the engine is
started in the "Start" posi-
tion. Always stand to one
side of the machine when
starting – never in front of
the tools. To reduce the
risk of injury, avoid con-
tact with the working tool.
469BA045 KN

MM 56 C
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6
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 ear protection because your
ability to hear warnings (shouts, alarms,
etc.) is impaired.
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.
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 in such a way
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!
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
symptoms appear (e.g. tingling
sensation in fingers), seek medical
advice.
As soon as the engine
starts running, the power
tool generates toxic
exhaust gas. These
gases may be odorless
and invisible and may
contain unburned hydro-
carbons and benzene.
Never run the engine
indoors or in poorly venti-
lated locations, even if
your model is equipped
with a catalytic converter.
Keep your hands and feet
well away from the work-
ing tool. To reduce the
risk of injury, never touch
a rotating tool. Always
stand behind the deflec-
tor or to one side of the
machine during opera-
tion – never in front of the
rotating tools.

MM 56 C
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7
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 original
STIHL replacement parts. They are
specifically designed to match your
model and meet your performance
requirements.
To reduce the risk of injury, always shut
off the engine before carrying out any
maintenance or repairs or cleaning the
machine. – Exception: Carburetor and
idle speed adjustments.
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed unless the slide control /
stop switch is on STOP or 0 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.
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.
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly, STIHL may deny coverage.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
The following STIHL MultiTools may be
mounted on the MultiEngine:
Approved MultiTools
MultiTool Application
BF-MM Pick tines
BK-MM Bolo tines
RL-MM Aerator
FC-MM Edger
FS-MM Clearing saw
MF-MM Dethatcher
KW-MM STIHL
PowerSweepTM
KB-MM Bristle brush
9911BA000 KN
BF-MM
BK-MM
RL-MM
FC-MM
KB-MMKW-MM
MF-MM
FS-MM

MM 56 C
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NLoosen the knob (1).
NSwing the bicycle handle with both
hands into the working position (as
far as stop).
NTighten down the knob firmly.
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of high-
quality premium gasoline and high-
quality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 (R+M)/2.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the 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 as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke air-
cooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
To ensure the maximum performance of
your STIHL engine, use a high quality 2-
cycle 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.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped with a catalytic converter.
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
Adjusting the bicycle handle
0000-GXX-0549-A1
1
Fuel