Stihl MF-MM User manual

Instruction Manual
STIH)
STIHL MF-MM
BA_U1_01_01.fm Seite 0 Freitag, 14. November 2003 11:20 11

1MF-MM
English
BA_SE_152_002_01_05.fmPrinted on chlorine-free paper.
Printing inks contain vegetable oils; paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2007 0458 483 0121. M0,3. C7. PM. Printed in USA
STIHl
Contents
MultiSystem ...................................... 2
Guide to Using this Manual .............. 2
Safety Precautions ........................... 3
Using the Dethatcher ........................ 9
Approved MultiEngines .................. 10
Mounting the MultiTool ................... 11
Starting / Stopping the Engine ........ 13
Replacing Spring Tines ................... 13
Minimize Wear and Avoid Damage 14
Main Parts ...................................... 15
Specifications ................................. 15
Maintenance and Repairs ............... 16
Certificate of Conformity ................. 16
Quality Certification ........................ 16
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
This machine has been built using
modern production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and troublefree use
of the machine.
Please contact your dealer or our
sales company if you have any
queries concerning your machine.
Hans Peter Stihl

2
English
MF-MM
In the STIHL MultiSystem the
MultiEngine can be combined with a
number of different MultiTools 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.
The MultiEngine and MultiTool come
with separate instruction manuals.
Always read and make sure you
understand both instruction manuals
before starting and using your machine.
Keep the manuals in a safe place for
later reference.
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
:A bullet marks a step or procedure
without direct reference to an
illustration.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Caution where there is a risk of
damaging the machine or its
individual components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s under-
standing of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
MultiSystem
469BA028 KN
+
+
Guide to Using this Manual

3MF-MM
English
Equipment and features
This instruction manual may refer to
several models with different
features. Components that are not
installed on all models and related
applications are marked with an
asterisk (*). Such components may
be available as special accessories
from your STIHL dealer.
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. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore some changes, modifications
and improvements may not be covered
in this manual.
Special safety
precautions must be
observed when working
with the dethatcher
because it is a high-speed
power tool with rotating
tines.
It is important that you
read and understand
both instruction manuals
(MultiEngine and
MultiTool) before using
the unit for the first time.
Keep the manuals in a safe place for
future reference.
Non-observance of the safety
precautions in the instruction manuals
may cause serious or even fatal injury.
Always observe local safety regulations,
standards and ordinances.
If you have never used this power tool
model before: Have your STIHL dealer
show you how to operate your power
tool or attend a special course of training
in power tool operation.
Do not lend or rent your power tool
combination without the instruction
manuals. Be sure that anyone using
your power tool understands the
information contained in both manuals
(MultiEngine and MultiTool).
Minors should never be allowed to use a
power tool. Children, bystanders and
animals should not be allowed in the
area where a power tool is in use.
The power tool user is responsible for
avoiding injury to third parties or damage
to their property.
To operate the power tool you must be in
good physical condition and mental
health and not under the influence of any
substance (drugs, alcohol) which might
impair vision, dexterity or judgment.
Use the dethatcher only for removing
old, dried cuttings, moss, grass or root
residue from lawns. It must not be used
for any other purpose because of the
increased risk of accidents.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with your specific model are authorized.
Other attachments must not be used
because of the increased risk of
accidents.
Safety Precautions

4
English
MF-MM
Never attempt to modify your power
tool in any way since this can be
extremely dangerous and result in
serious or fatal injury. STIHL cannot
accept any liability for personal injury or
damage to property caused by
modifications to the power tool or using
attachments not approved by STIHL.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. An overall and
jacket combination is
recommended, do not
wear a coat.
Avoid loose-fitting jackets, scarves,
neckties, jewelry or anything that could
become caught on wood or brush.
Secure long hair (cap,
hard hat, etc.).
Wear steel-toed safety
boots with non-slip soles.
Wear safety glasses for
protection from thrown
objects.
Wear hearing protection, e.g. ear plugs
or ear muffs.
Wear heavy-duty,
non-slip gloves,
preferably made of
leather.
STIHL has a full line of safety clothing
and equipment.
Transporting the Machine
Always turn off the engine. Carry the unit
by the carrying handle.
– Attachment in front of you.
– Hot muffler away from your body.
The dethatcher may be dragged
backwards (opposite to normal direction
of operation) for short distances. Never
attempt to move it around by pushing it
forwards (normal direction of operation)
as this could result in serious damage.
The spring tines might break.
See also notes on "Transporting the
Power Tool" in the MultiEngine
instruction manual.
469BA001 KN

5MF-MM
English
Before Starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manuals:
To reduce risk of injury from MultiTool
rotating in the wrong direction, check
that position of gearbox is correct and
adjust if necessary.
See chapter on "Mounting the
MultiTool".
Correct Position of Gearbox:
(when using dethatcher)
The axle (1) must be below the drive
shaft (2) so that the MultiTool rotates in
the direction of the arrow (3).
Position the gearbox for metal
attachments (top illustration) so that the
axle is below the drive shaft.
See also notes on "Before Starting" in
the MultiEngine instruction manual.
– Attachments must be correctly and
securely mounted and in good
condition (clean, move freely, not
warped).
– Mount both deflector extensions
and the mud flap.
– Never attempt to modify the controls
or safety devices.
– Keep the handles dry and clean for
safe control.
– Set the handlebar to the normal
operating position and tighten down
firmly with the rotary knob. See
chapter on "Adjusting the
Handlebar" in the MultiEngine
instruction manual.
Always check your power tool for proper
condition and operation before starting.
Inspect the deflector, deflector
extensions and mud flap for damage or
wear.
Replace any damaged parts. Do not
operate the machine with a damaged
deflector. Replace damaged
attachments (e.g. tines) immediately.
2
469BA043 KN
1
3

6
English
MF-MM
Starting the Engine
Place the unit on firm ground in an open
area. Make sure you have good balance
and secure footing. Hold the unit
securely. To reduce the risk of damage,
be sure that the attachments are clear of
the ground and all other obstructions.
Your power tool is a one-person unit.
TRisk of injury from
contact with dethatcher
attachment. The
attachments begin 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 attachments.
Check engine idle speed setting. The
attachments must not rotate when the
engine is idling with the throttle trigger
released.
See also chapter on "Starting the
Engine" in the MultiEngine instruction
manual.
Holding and Controlling the
Machine
Always hold the unit firmly with both
hands on the handles.
For safe control wrap your fingers and
thumbs tightly around the control handle
and left handle.
Hold the control handle with your right
hand and left handle with your left hand.
During Operation
Note that the attachments continue to
rotate for a short period after you let go
of the throttle trigger (flywheel effect).
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert at all times so as not to
endanger others.
Make sure you have good balance and
secure footing at all times, taking special
care in slippery conditions:
–damp
– on slopes, uneven ground etc.
Operate the dethatcher only at a normal
walking pace. Do not push the tines into
the ground.
Be extremely cautious when pulling the
dethatcher towards you because of the
risk of injury from contact with the
attachment.
To reduce the risk of accidents and
injury, clear obstacles and objects from
the work area.
Do not operate using the starting throttle
lock as you do not have control of the
engine speed.
To reduce the risk of injury from contact
with the attachment, never operate a
dethatcher without a properly mounted
deflector.
469BA045 KN

7MF-MM
English
To reduce the risk of injury from contact
with the attachment, do not allow
bystanders within 5 m of your own
position.
Before starting work, inspect the area for
stones, glass, pieces of metal, trash or
other solid objects. Such objects may
damage the attachment.
Be extremely cautious when changing
direction with the dethatcher – especially
on slopes.
On slopes, always work parallel to the
slope to reduce the risk of injury from
slipping or contact with the tines.
Never work on steep slopes because of
the risk of injury through loss of control
of the dethatcher.
To reduce the risk of
injury, keep your hands
and feet well away from
the attachment. Never
touch a rotating
attachment.
Always stand behind the deflector or to
one side of the machine during work –
never in front of the attachments.
The correct engine idle speed is
important to ensure that the attachments
stop rotating when you let go of the
throttle trigger.
Check and correct the idle speed setting
at regular intervals – see MultiEngine
instruction manual. If the attachments
still rotate, have your servicing dealer
check your power tool and make proper
adjustments or repairs.
To reduce the risk of injury, take
particular care when working close to
fences, walls, stones, roots, trees and
areas of dense growth. Solid objects can
be thrown or damage the tines.
When operating next to high scrub,
bushes and hedges, take care not to
harm small animals (e.g. hedgehogs).
Clean the attachments and deflector at
regular intervals during operation –
always stop the engine and disconnect
the spark plug boot before cleaning.
Remove grass, weeds, mud, etc.
Check the attachments at regular short
intervals, particularly after contact with
solid objects or if there is any noticeable
change in behavior:
– Shut off the engine, hold the unit
firmly.
– Check condition and tightness of
attachments, look for broken spring
tines.
– Replace damaged spring tines
immediately.
To reduce the risk of unintentional
engine start and injury, always shut off
the engine and remove the spark plug
boot before checking or changing
attachments
Do not attempt to repair damaged spring
tines. Do not continue using the
dethatcher if the spring tines are
damaged.
5m (16ft)

8
English
MF-MM
After finishing work, clean soil, moss,
weeds, etc. off the attachment – always
turn off the engine and make sure the
attachment has stopped before
cleaning. Wear gloves to reduce the risk
of injury.
See also notes on "During Operation" in
the MultiEngine instruction manual.
When the machine is not in use, put it
down so that it does not endanger
others. Protect it from unauthorized use
(e.g. by children).
General Precautions
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
When working, make sure that the
attachments do not touch any foreign
materials such as rocks, nails etc. Such
objects may damage the tines.
Keep within calling distance of others in
case help is needed.
Maintenance and Repairs
Do not attempt any maintenance or
repair work not described in the
MultiTool and MultiEngine instruction
manuals. Have all other worked
performed by your STIHL servicing
dealer.
Only use original STlHL replacement
parts for repairs to the machine. The use
of replacement parts from other
manufacturers may result in damage to
the machine and increase the risk of
injury.
Never attempt to modify your power tool
in any way as this could result in serious
injury.
:Shut off the engine:
– Before performing any maintenance
or repair work.
– Before cleaning the MultiTools.
– Before mounting or removing the
MultiTools.
– Before rectifying blockages or other
problems.
Thoroughly clean the MultiTools and
coat them with a corrosion inhibitor.
Store the machine as described in the
MultiEngine instruction manual – see
chapter on "Storing the Machine".

9MF-MM
English
The MF-MM dethatcher MultiTool is
designed to loosen and remove old, dry
cuttings, twigs as well as moss and the
residue of roots from lawns.
Preparations
If the lawn is very dry, spray it with water
to soften the ground a little and reduce
the amount of dust created.
If the grass is longer than about 2 in
(5 cm), mow it before using the
dethatcher.
:To reduce the risk of accidents or
injury, remove all obstacles and
objects from the work area.
:Plan the route to be taken.
The MF-MM dethatcher is operated in
the forward direction only.
To reduce the risk of damage and
breakage, the dethatcher may only
rotate in one direction.
Arrows on the flanges show the correct
direction of rotation – see "Mounting the
MultiTool".
To reduce the risk of injury, never
use the dethatcher without the
properly mounted deflector with
the two extensions and the skirt.
These devices divert loosened and
removed material away from the
machine and operator.
Using the Dethatcher
483BA001 KN
483BA002 KN
483BA003 KN

10
English
MF-MM
Operation
:Start the engine.
:Work with the engine running at full
throttle.
:Walk at a pace that achieves the
required result without lugging down
the engine.
:Push the dethatcher forward no
faster than 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 gloves.
– Remove the inner hitch pin 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.
Reit the dethatcher – see also "Mounting
the MultiTool".
Only MultiEngines which have been
supplied by STIHL or specially approved
for use with this MultiTool may be used.
This MultiTool may only be used in
combination with STIHL MM 55.
Approved MultiEngines

11MF-MM
English
Removing Existing MultiTools
:Wear gloves to reduce the risk of
injury from contact with sharp,
pointed MultiTools and/or the hot
surface of the gearbox.
:Remove the hitch pin and pull
MultiTool off the shaft.
:Clean the gearbox if necessary.
See also "Mounting the MultiTool" in the
instruction manual of the other MultiTool.
Checking Position of Gearbox
To reduce risk of injury from MultiTool
rotating in the wrong direction, check
that position of gearbox is correct and
adjust if necessary.
The shaft (1) must be below the drive
tube (2) so that the MultiTool rotates in
the direction of the arrow (3).
Adjusting Position of Gearbox
:Loosen clamp screws on gearbox.
:Turn gearbox 180°.
:Line up the gearbox in the correct
position.
:Tighten down the two clamp screws
on the gearbox in the following
sequence:
– Tighten first screw moderately.
– Tighten second screw moderately.
– Tighten down first screw firmly.
– Tighten down second screw firmly.
Mounting the MultiTool
481BA008 KN

12
English
MF-MM
Mounting the MultiTool
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. The spring
tines may be damaged or broken if
the direction of rotation is wrong.
:Rotate the left-hand dethatcher (4)
on the shaft until it can be pushed
into position. Check arrows showing
direction of rotation.
:Insert hitch pin (5) in hole in shaft
and snap it into position.
:Mount the right-hand dethatcher in
the same way.
Mounting and Removing the
Deflector Extensions
: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).
To remove the extensions:
:Use the combination wrench to
disengage the tab (1) and pull the
extensions away.
The deflector extensions divert
removed material and debris away
from the machine and operator.
Never work without properly fitted
deflector extensions.
Installing and Removing the Skirt
:Secure the skirt (1) with screw (2)
and rotary knob (3) to the right-hand
side of the flange.
:Adjust the skirt to the required depth
so that it overlaps the deflector.
:Tighten the rotary knob firmly.
The skirt diverts removed material
and debris away from the machine
and the operator.
Never work without a properly
mounted skirt.
4
483BA004 KN
5
11
483BA007 KN
3
483BA011 KN
2

13MF-MM
English
Starting
:Secure the handlebar in the
operating position.
:Retract the wheels, if fitted – see
notes on "Wheels" in the
MultiEngine instruction manual.
:Place the unit on a patch of clear
ground. It must rest securely on the
engine flange and the support on
the frame. Check that the working
tools are not touching the ground or
any other obstacles.
Make sure you have good balance
and secure footing – as shown in
the illustration. To reduce the risk of
injury from contact with rotating
attachments, always stand to the
side of the power tool, never in front
of or near the attachments.
:With your left hand on the loop
handle, press the unit firmly against
the ground.
Do not stand or kneel on the
handlebar or frame.
The starting procedure is now as
described in the MultiEngine instruction
manual.
To shut down the engine
:Push slide control in direction of
arrow ( h) to STOP – $.
Replace individual spring tines if they
are severely damaged or broken.
:Remove the dethatcher – see
"Mounting the MultiTool".
:Loosen the screws (1).
:Remove the flange (2).
Spring tines and washers are fitted
alternately on the tubes.
:Pull off the spring tines (3) and
washers.
:Replace damaged spring tines.
:Fit spring tines and washers on the
tubes until they are full.
:Fit the flange (2).
:Tighten down the screws (1) firmly.
:Mount the dethatcher – see
"Mounting the MultiTool".
Starting / Stopping the
Engine
469BA027 KN
Replacing Spring Tines
483BA006 KN
1
2
31

14
English
MF-MM
Observing the instructions in this manual
and the MultiEngine 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 these
instruction manuals.
The user is responsible for all damage
caused by non-observance of the safety
precautions, operating and maintenance
instructions. This includes in particular:
– Alterations or modifications to the
product not approved by STIHL.
– Using attachments or tools not
approved by STIHL.
– 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 maintenance operations must be
performed on a regular basis.
If these maintenance operations cannot
be performed by the owner, they should
be performed by an authorized STIHL
servicing dealer.
If these operations are not carried out
as specified, the user assumes
responsibility for any damage that may
occur. Among other things, this includes:
– Corrosion and other consequential
damage resulting from improper
storage.
– Damage and consequential
damage resulting from the use of
parts other than original STIHL
replacement parts.
– Damage resulting from
maintenance or repair work not
performed by authorized STIHL
servicing dealers.
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, depending of the type and
duration of use, and have to be replaced
in good time. Among other parts, this
includes:
– Spring tines
– Mounting hardware for spring tines
– Deflector extensions
–Mudflap
Minimize Wear and
Avoid Damage

15MF-MM
English
1Right-hand wheel
2Left-hand wheel
3Inner hitch pin, left
4Deflector extension, right
5Deflector extension, left
6Mud flap
7Outer hitch pin, left
8Spring tines
Dethatcher MultiTool
Weight
Main Parts
1
483BA010 KN
8326
5
4
7
Dethatcher, left, right
Working width: 550 mm
Dethatcher with
deflector extensions
and mud flap 6.1 kg
Specifications

16
English
MF-MM
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 all
maintenance and repair work be carried
out by an authorized STIHL dealer.
STIHL dealers regularly 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 equivalent. Only use
high-quality replacement parts in order
to avoid the risk of accidents or damage
to the machine.
STIHL recommends the use of genuine
STIHL replacement parts.
Original STlHL parts can be identified by
the STIHL part number, the
STIHl
logo and the STlHL parts symbol (.
The symbol may appear alone on small
parts.
ANDREAS STIHL AG & Co. KG
Badstr. 115
71336 Waiblingen
certify that the new machine described
below
conforms to the specifications of
Directive 98/37/EC.
The product has been developed and
manufactured in compliance with the
following standards:
EN ISO 12100, EN 13684
(in conjunction with the specified
MultiEngine: MM 55).
See CE label for machine's year of
manufacture.
Done at Waiblingen, February 15, 2007
ANDREAS STIHL AG & Co. KG
Elsner
Director
Group Product Management
All STIHL products comply with the
highest quality standards.
An independent organization has
certified that all products manufactured
by STIHL meet the strict requirements of
the ISO 9001 standard for quality
management systems in terms of
product development, materials
purchasing, production, assembly,
documentation and customer service.
Maintenance and Repairs
Category: MultiTool
Make: STIHL
Model: MF-MM
Series identification: 4106
Certificate of Conformity Quality Certification
000BA026

0458 483 0121
englisch / English
BA_U4_01_01.fm Seite 1 Freitag, 14. November 2003 11:23 11