STIHL MF-MM
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 - 18
Manual de instrucciones
19 - 38
Contents
English
MultiSystem 2
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Using the Unit 9
Approved MultiEngines 10
Mounting the MultiTool 10
Mounting the Deflector 12
Original Instruction ManualPrinted on chlorine-free paper
Starting / Stopping the Engine 13
Replacing Spring Tines 14
Storing the Machine 14
Maintenance and Care 14
Main Parts 15
Specifications 16
Maintenance and Repairs 16
Disposal 17
Trademarks 17
Printing inks contain vegetable oils, paper can be recycled.
Allow only persons who fully understand
the manuals of the MultiEngine and
Dethatcher MultiTool to operate this
power tool combination.
To receive maximum performance and
satisfaction from your STIHL MultiTool, 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 MultiTool. 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 the
two manuals.
WARNING
Because a MultiEngine equipped with a
Dethatcher MultiTool is a power tool with
a relatively fast turning attachment,
some special safety precautions must
be observed to reduce the risk of
personal injury. Careless or improper
use may cause serious or even fatal
injury.
© ANDREAS STIHL AG & Co. KG, 2022
0458-483-8621-A. VA0.C22.
0000000634_008_GB
MF-MM
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
469BA028 KN
+
+
MultiSystem
In the STIHL MultiSystem, various
MultiEngines and MultiTools are
combined to form a machine. In this
Instruction Manual, the functional unit of
MultiEngine and MultiTool is referred to
as a machine.
Accordingly, the instruction manuals for
the MultiEngine and the MultiTool
constitute the entire Instruction Manual
for the machine.
Always read both manuals carefully
before using your machine for the first
time and keep them safe for future
reference.
Guide to Using this Manual
Pictograms
All the pictograms attached to or
embossed on the machine are shown
and explained in this manual.
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
following symbols and signal words:
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.
2
MF-MM
English
Safety Precautions and
Working Techniques
Because a MultiEngine
equipped with a
dethatcher MultiTool is a
powerful tool, 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 manuals and
the safety precautions of
your MultiEngine and
MultiTool 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 manuals of your
MultiEngine and MultiTool. Be sure that
anyone using it understands the
information contained in these manuals.
WARNING
The use of this machine may be
hazardous. If the rotating tool comes in
contact with your body, it will injure you.
Solid foreign objects such as rocks or
bits of metal can damage the tool.
STIHL does not recommend the use of a
dethatcher in stony areas.
Use your MultiEngine equipped with the
dethatcher MultiTool only for removing
dead grass, moss and other
accumulated material from the top of the
soil.
WARNING
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
WARNING
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
WARNING
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
Most of these safety precautions and
warnings apply to the use of all STIHL
power tools. Different models may have
different parts and controls. See the
appropriate section of your MultiEngine
and MultiTool instruction manuals for a
description of the controls and the
function of the parts of your model.
Safe use of a power tool 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.
Proper Clothing
WARNING
To reduce the risk of injury, the operator
should wear proper protective apparel.
The suitable deflector for your power
tool will not protect the operator from all
foreign objects (stones, glass, wire, etc.)
thrown back by the rotating attachment.
Thrown objects may also ricochet and
strike the operator.
MF-MM
3
English
WARNING
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protective glasses with
adequate top and side
protection complying with
ANSI Z87 "+" (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.
Always wear heavy duty
work gloves (e.g. made of
leather or other wear
resistant material) when
handling the power tool
and the attachment.
Heavy-duty, nonslip
gloves improve your grip
and help to protect your
hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Wear long
pants made of heavy
material to help protect
your legs. Do not wear
shorts, sandals or go
barefoot.
Avoid loose-fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants,
unconfined long hair or anything that
could become caught on branches,
brush or the moving parts of the unit.
Secure hair so it is above shoulder level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
For further instructions on proper
clothing see the safety precautions in
the instruction manual of the
MultiEngine you are using.
THE POWER TOOL (MULTIENGINE
EQUIPPED WITH DETHATCHER
MULTITOOL)
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
and expressly approved by STIHL for
use with the specific STIHL power tool
models 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.
THE USE OF THE POWER TOOL
(MULTIENGINE EQUIPPED WITH
DETHATCHER MULTITOOL)
Transporting the Power Tool
WARNING
To reduce the risk of injury from loss of
control and MultiTool contact, never
carry or transport your power tool with
the MultiTool moving.
WARNING
Always switch off the engine and make
sure the MultiTool has stopped before
putting a power tool down.
4
MF-MM
English
469BA001 KN
Grip the power tool by the carrying
handle with the attachment facing
forward.
WARNING
When transporting it in a vehicle,
properly secure it to prevent turnover,
fuel spillage and damage to the unit.
Before Starting
WARNING
Always check your power tool for proper
condition and operation before starting.
Never attempt to modify the controls or
safety devices.
WARNING
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely or
securely assembled.
Unfold the bike handle into the working
position and secure it with the knob (see
chapter "Adjusting the bicycle handle" of
your MultiEngine instruction manual.)
Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, fuel mix,
grease or resin in order for you to
maintain a firm grip and properly control
your power tool.
WARNING
To reduce the risk of injury from the
MultiTool rotating in the wrong direction,
check that the position of the gearbox is
correct and change it if necessary.
On metal tools (top illustration), position
the gearbox so that the shaft is below
the drive tube.
Use for:
– BF-MM cultivator blades with
pointed tines
– BK-MM cultivator blades with
curved tines
– FC-MM edger
– RL-MM aerator
– MF-MM dethatcher
WARNING
The MultiTool must be properly
tightened and in safe operating
condition. Inspect for loose parts (hitch
pins, screws, etc.) and for cracked, bent,
warped or damaged blades. Replace
damaged blades before using the power
tool.
WARNING
Do not attach any MultiTool to a unit
without proper installation of all required
parts. Failure to use the proper parts
may cause the attachment to fly off and
seriously injure the operator or
bystanders.
MF-MM
5
English
486BA011 KN
469BA027 KN
469BA045 KN
Check the Deflector
WARNING
To reduce the risk of injury from thrown
objects and contact with the attachment,
never operate your power tool without a
properly mounted deflector.
Operate the MF-MM dethatcher
MultiTool only with the deflector shown
above in combination with properly
mounted deflector extensions and mud
flap (see chapter "Mounting the
MultiTool".)
Starting
WARNING
Start the engine at least 10 feet (3 m)
from the fueling spot, outdoors only.
For specific starting instructions, see the
appropriate section of your MultiEngine
and MultiTool manuals.
Place the power tool on firm ground or
other solid surface in an open area.
Maintain good balance and secure
footing.
WARNING
Always stand to one side of the unit to
avoid the risk of injury from contact with
the rotating MultiTool.
WARNING
To reduce the risk of injury from loss of
control, be absolutely sure that the
MultiTool is clear of you and all other
obstructions and objects, including the
ground, because when the engine starts
at starting-throttle, engine speed will be
fast enough for the clutch to engage and
move the MultiTool.
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
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
See also the safety precautions on
Starting in the instruction manual of the
MultiEngine.
During Operation
Holding and Controlling the Power Tool
Always hold the unit firmly with both
hands on the handles while you are
working. Wrap your fingers and thumbs
around the handles, keeping the
handles cradled between your thumb
and forefinger. Keep your hands in this
position to have your power tool under
control at all times.
WARNING
Never attempt to operate
your power tool with one
hand. Loss of control of
the power tool may result
in serious or fatal injury.
To reduce the risk of
injury, keep hands and
feet away from the
MultiTool. Never touch a
moving MultiTool with
your hand or any other
part of your body.
6
MF-MM
English
WARNING
Do not overreach. Keep proper footing
and balance at all times. 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 scrub and cuttings. Be extremely
cautious when working on slopes or
uneven ground.
Operate the power tool only at a normal
walking pace.
WARNING
To avoid the risk of injury from contact
with the rotating attachment, be
extremely cautious when pulling the
power tool toward you.
Be extremely cautious when changing
direction with the power tool – especially
on slopes.
WARNING
To avoid the risk of injury from loss of
control, never work on steep slopes.
Working Conditions
Start and operate your power tool only
outdoors in a well-ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
WARNING
If the soil being worked on or the
surrounding ground is coated with a
chemical substance (such as an active
pesticide or herbicide), read and follow
the instructions and warnings that
accompany the substance at issue.
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 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.
DANGER
Your power tool is not
insulated against electric
shock. To reduce the risk
of electrocution, ensure
that there are no power
cables near the surface
or in the working area
that could come into contact with the MultiTool.
Damaging such cables
with the tool can cause
electric shocks with serious or fatal
consequences.
Information on the routing of cables can
be obtained from public utilities and such
service providers as "Miss Utility" or
"One Call."
WARNING
Use the power tool at ground level only.
The risk of injury is increased if you use
MultiTools above ground level because
they are more exposed and the power
tool is more difficult to control.
Operating Instructions
WARNING
Do not operate your power tool using the
starting throttle lock, as you do not have
control of the engine speed.
In the event of an emergency, switch off
the engine immediately – move the slide
control / stop switch to 0 or STOP.
MF-MM
7
English
WARNING
The MultiTool continues to rotate for a
short period after the throttle trigger is
released (flywheel effect).
If the MultiTool or deflector becomes
clogged or stuck, always switch off the
engine and make sure the attachment
has stopped before cleaning. Grass,
moss, weeds, etc. should be cleaned off
the attachment as necessary.
To reduce the risk of eye and other injury
ensure that bystanders are at least
17 feet (5 m) away. Bystanders should
be encouraged to wear eye protection.
To reduce the risk of damage to
property, also maintain this distance
from such objects as vehicles or
windows.
Stop the engine immediately if you are
approached.
WARNING
Before you start work, examine the area
for stones, glass, pieces of metal,
rubbish or other solid objects. Such
objects may also damage the MultiTool.
Do not use the dethatcher MultiTool on
gravel surfaces.
WARNING
Never divert discharge of material
toward bystanders nor allow anyone
near the area of operation. Use care in
directing discharge to avoid damage to
surfaces, automobiles, and the like.
WARNING
During work, check the tightness and the
condition of the MutiTool at regular
intervals with the engine and attachment
stopped. If the behavior of the
attachment changes during use, stop
the engine immediately and check the
attachment for cracks, wear and
damage. Replace bent, worn or
damaged attachments immediately.
Such attachments may shatter at high
speed and cause serious or fatal injury.
WARNING
The gearbox becomes hot during
operation. To reduce the risk of burn
injury, do not touch the gear housing
when it is hot.
MAINTENANCE, REPAIR AND
STORING
WARNING
Always stop the engine and make sure
that the attachment is stopped before
doing any maintenance or repair work or
cleaning the power tool. Do not attempt
any maintenance or repair work not
described in your MultiEngine and
MultiTool instruction manuals. Have
such work performed at your STIHL
servicing dealer only.
WARNING
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non-STIHL parts may cause serious or
fatal injury.
WARNING
Never repair damaged attachments by
welding, straightening or modifying the
shape. This may cause parts of the
attachment to come off and result in
serious or fatal injuries.
Tighten all nuts, bolts and screws,
except the carburetor adjustment
screws, after each use.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Store the power tool in a dry and high or
locked location out of reach of children.
8
MF-MM
English
483BA001 KN
483BA002 KN
483BA003 KN
Using the Unit
The MF-MM dethatcher MultiTool is
designed to remove old, dried cuttings,
moss, grass or root residue from lawns.
Preparations
If the lawn is very dry, spray it with water
before you start work: this softens the
soil a little and reduces the amount of
dust created.
If the grass is longer than about 2 in
(5 cm), mow it before using the
dethatcher.
WARNING
Clear away all obstacles and solid
objects from the work area.
N Plan the route to be taken.
Operate the MultiEngine with MF-MM
dethatcher in the forward direction only.
The attachments may only be rotate in
one direction. Arrows on the flanges
show the correct direction of rotation –
see chapter on "Mounting the MultiTool".
WARNING
Never work without the deflector, both
deflector extensions and the mud flap.
These devices divert loosened and cut
material away from the machine and the
operator.
Operation
N Secure the handlebar in the normal
operating position.
N Starting the Engine
N Work with the engine running at full
throttle.
N Walk at a pace that achieves the
required result without lugging down
the engine.
N Operate at no more than a normal
walking pace.
Cleaning the Dethatcher
Parts of plants, such as grass or roots,
may become tightly wound around the
tool mounting and the attachment itself.
Clean the attachment as follows:
– Shut off the engine.
– Wear work gloves.
– Remove the inner hitch pins from
the shaft.
– Pull the dethatcher off the shaft.
– Remove the outer hitch pin (wheel)
from the shaft.
– Pull off the wheel.
– Remove pieces of roots, plants and
soil.
Refer to "Mounting the MultiTool" for
mounting instructions.
MF-MM
9
English
481BA008 KN
486BA011 KN
Approved MultiEngines Mounting the MultiTool
Only use MultiEngines supplied by
STIHL or expressly approved by STIHL
for use with the MultiTool.
This MultiTool may only be used in
combination with the STIHL MM 56
MultiEngine.
Removing Existing MultiTools
WARNING
Wear gloves to reduce the risk of injury
from contact with sharp MultiTools
and/or hot surface of gearbox.
N Remove the hitch pins and pull the
MultiTools (if fitted) off the axle –
see also "Mounting the MultiTool" in
the User Manual of the other
MultiTool.
N Clean the gearbox if necessary.
Checking the Deflector
WARNING
The MF-MM dethatcher must only be
operated with the deflector and properly
installed deflector extensions shown
here to reduce the risk of injury from
propelled objects.
10
MF-MM
English
1
486BA012 KN
2
1
3
486BA013 KN
4
7
7
5
486BA014 KN
6
1
1
2
486BA015 KN
481BA011 KN
Changing the Deflector
Remove the gearbox.
N Loosen the clamp screws (1) and
pull the gearbox (2) off the shaft.
Removing the Deflector
Fitting New Deflector
N Line up the deflector (5) on the
flange (6) and push it onto the shaft
as far as the limit stop.
N Tighten the clamp screws (7)
securely.
Installing the Gearbox
Checking Position of Gearbox
WARNING
To reduce the risk of injury from the
MultiTool rotating in the wrong direction,
check that position of gearbox is correct
and adjust if necessary.
The axle (1) must be below the shaft (2).
Direction of rotation (3) of the MultiTool.
Adjusting Position of Gearbox
N Loosen the screw (3) and pull the
deflector (4) off the shaft.
MF-MM
N Push the gearbox (2) onto the shaft
as far as the limit stop while turning
it back and forth.
N Line up the gearbox.
N Go to "Checking Position of
Gearbox".
N Loosen clamp screws on gearbox.
N Turn the gearbox 180°.
N Line up the gearbox in the correct
position.
N Tighten the two clamping screws as
illustrated in the diagram below:
11
English
4
483BA004 KN
5
1
1
483BA007 KN
– Tighten the first screw slightly.
– Tighten the second screw slightly.
– Tighten down first screw securely.
– Tighten down second screw
securely.
NOTICE
It must not be possible to rotate the
gearbox on the shaft.
Installing the Dethatcher
NOTICE
Left-hand and right-hand dethatchers
are different.
The direction of rotation is marked with
arrows on the gearbox and flange. Make
sure both arrows point in the same
direction.
Risk of damage if the direction of
rotation is wrong! The spring tines could
break
N Rotate the left-hand dethatcher (4)
on the shaft until it can be pushed
into position – check the direction of
rotation again (arrows).
N Insert hitch pin (5) in hole in shaft
and snap it into position.
N Mount the right-hand dethatcher in
the same way.
WARNING
Always install both dethatchers.
Mounting the Deflector
Mounting and Removing the Deflector
Extensions
Mounting
N Slide both deflector extensions onto
the right and left sides of the
deflector, push them fully home at
the top and bottom and engage the
tab (1).
Removing
N Use the combination wrench to
disengage the tabs (1) and then pull
off the extensions.
WARNING
The deflector extensions divert removed
material and debris away from the
machine and the operator. Never work
without a properly mounted deflector
extensions.
12
MF-MM
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