Stihl BF-MM User manual

Instruction Manual
STIH)
STIHL BF-MM, BK-MM
BA_U1_01_01.fm Seite 0 Freitag, 22. Februar 2008 10:56 10

1BF-MM, BK-MM
English
BA_SE_131_002_01_06.fmPrinted on chlorine-free paper.
Printing inks contain vegetable oils; paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2008 0458 484 0121. M0,1. C8. Rei. Printed in Germany
STIHl
Contents
MultiSystem ...................................... 2
Guide to Using this Manual .............. 2
Safety Precautions ........................... 3
Working with the unit ........................ 9
Approved MultiEngines .................. 11
Mounting the MultiTool ................... 12
Starting / Stopping the Engine ........ 13
Minimize Wear and
Avoid Damage ................................ 14
Main Parts ...................................... 16
Specifications ................................. 17
Maintenance and Repairs ............... 17
Certificate of Conformity ................. 17
Quality Certification ........................ 18
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
BF-MM, BK-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

3BF-MM, BK-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.
Because a cultivator is a
high-speed power tool
with rotating blades,
special safety
precautions must be
observed in addition to
those that generally apply when working
with a hoe.
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 power tool only for deep tilling
previously cultivated, packed or loose
soil, furrowing, weeding and working
mulches into loosened soil. It must not
be used for any other purpose because
of the increased risk of accidents.
Only rotor blades supplied by STIHL or
expressly approved by STIHL for use
with your specific model are authorized.
Other rotor blades must not be used
because of the increased risk of
accidents.
Safety Precautions

4
English
BF-MM, BK-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. Overalls or a
coverall are
recommended.
Avoid loose-fitting jackets, work coats,
scarves, neckties, jewellery 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 a face shield or face
screen and safety
glasses for protection
from thrown objects.
Warning: A face shield or face screen
alone does not provide adequate eye
protection.
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 suspended from the
shoulder strap or properly balanced by
the drive tube.
– Rotor blades in front of you.
– Hot muffler away from your body.
– Retract the spur, if fitted.
When the machine is not in use (work
break), shut it off so that it does not
endanger others.
See also notes on "Transporting the
Power Tool" in the MultiEngine
instruction manual.
469BA001 KN

5BF-MM, BK-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 the
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:
The gearbox output shaft (1) must be
below the drive tube (2) so that the
MultiTool rotates in the direction of the
arrow (3).
Position the gearbox for metal
attachments so that the gearbox output
shaft is below the drive tube.
See also notes on "Before Starting" in
the MultiEngine instruction manual.
– The blades must be correctly and
securely mounted and in good
condition (clean, move freely, not
warped).
– 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 it
down firmly with the rotary knob.
See chapter on "Adjusting the
Handlebar" in the MultiEngine
instruction manual.
See also chapter on "Before Starting" in
the MultiEngine instruction manual.
Starting the Engine
Place the unit on firm ground in an open
area. Make sure you have good balance
and secure footing. Retract the spur, if
fitted. Hold the unit securely. To reduce
the risk of damage, be sure that the
blades are clear of the ground and all
other obstructions.
Your power tool is a one-person unit. To
reduce the risk of injury, do not allow
other persons within a radius of 5 meters
of your own position – even when
starting.
Risk of injury from
contact with rotating
blades. The blades 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 blades.
2
469BA024 KN
1
3

6
English
BF-MM, BK-MM
The correct engine idle speed is
important to ensure that the blades stop
rotating when you let go of the throttle
trigger.
See also notes on "Starting the Engine"
in the MultiEngine instruction manual.
Always check your power tool for proper
condition and operation before starting.
Inspect the deflector for damage or
wear.
Replace any damaged parts. Do not
operate the machine with a damaged
deflector. Replace damaged blades
immediately even if they have only minor
hairline cracks.
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
The blades continue to rotate for a short
period after the throttle trigger is
released – 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, snow, ice
– on slopes, uneven ground etc.
Operate the power tool only at a normal
walking pace.
Be extremely cautious when pulling the
power tool towards you because of the
risk of injury from contact with the
rotating attachment.
Watch out for hidden obstacles such as
tree stumps and roots to avoid
stumbling.
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 blades, never operate your unit
without the specified deflector.
469BA014 KN

7BF-MM, BK-MM
English
To reduce the risk of injury from contact
with the blades, 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 blades.
Be extremely cautious when changing
direction with the power tool – especially
on slopes.
Never work on steep slopes because of
the risk of injury through loss of control
of the power tool.
To reduce the risk of
injury, keep your hands
and feet well away from
the blades. Never touch a
rotating blade.
Always stand behind the deflector or to
one side of the machine during work –
never in front of the blades.
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 blades still
rotate, have your STIHL dealer check
your power tool and make proper
adjustments or repairs.
Warning!
To avoid the risk of
electrocution, never use
the cultivator in areas
where electrical lines are
laid on the surface or
buried just below the surface.
Striking and damaging such lines with
the blades could cause serious or even
fatal injury.
To reduce the risk of injury, take
particular care when working close to
fences, walls, stones, roots, trees and
areas of dense growth.
Clean grass, weeds, soil (clumps), etc.
off the rotor blades and deflector at
regular intervals – always shut off the
engine and make sure the blades have
stopped before cleaning. Wear gloves to
reduce the risk of injury.
Check the blades at regular short
intervals, particularly if there is any
noticeable change in behavior:
– Shut off the engine, hold the unit
firmly.
– Check condition and tightness –
look for cracks.
– Replace damaged blades
immediately – even if they have only
minor hairline cracks,
Do not continue using damaged or
cracked rotor blades or attempt to repair
them – e.g. by welding or straightening
(out-of-balance).
5m (16ft)

8
English
BF-MM, BK-MM
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
After finishing work, clean dirt, soil, plant
residue, etc. off the power tool – always
shut off the engine and make sure the
blades have stopped before cleaning.
Wear gloves to reduce the risk of injury.
Do not use a grease solvent for
cleaning.
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.
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 rotor
blades 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 BF-MM,
BK-MM 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 blades.
– Before mounting or removing the
blades.
– Before rectifying blockages or other
problems.

9BF-MM, BK-MM
English
Thoroughly clean the blades and coat
them with a corrosion inhibitor.
Store the machine as described in the
MultiEngine instruction manual – see
chapter on "Storing the Machine".
General
:Move bike handle into working
position
Rotor blades
MultiTools with rotor blades are available
in two versions:
Pick tines
Bolo tines
:The MultiEngine with rotor blades
can be operated forwards (1) or
backwards (2).
Which direction of movement and which
type of rotor is the most advantageous
depends on the application and service
conditions. Rough guide:
On firm ground
– Use the pick tines
– Work alternately forwards and
backwards
On loose soil
– Use the bolo tines
– Work uniformly forwards or
backwards
The rotor blades may only be operated
in one position. Arrows on the rotors
indicate the required direction of
rotation, refer to "Mounting the
MultiTool".
Working with the unit
469BA015 KN
469BA016 KN
21

10
English
BF-MM, BK-MM
Pick tines
Pick tines are particularly suitable for
working and loosening up hard,
encrusted or compacted soil.
Bolo tines
The bolo tines are particularly suitable
for working through soil which is well
cultivated and not compacted.
Typical applications
:Breaking up a hard crust
Preparatory work is required to break up
hard compacted soil (e.g. last year's
vegetable garden or flower beds).
Weeds and other plant remnants must
be removed from the surface, together
with hard objects, such as stones,
bottles, pieces of wood, etc.
Hold the unit firmly with both hands and
always work through the soil to the
required depth over a small area only.
Move the unit alternately forwards and
backwards.
In the final steps, guide the machine so
that you do not leave any footprints.
Then level the entire prepared area with
a rake.
:Loosening cultivated soil
Cultivated soil should only be loosened
superficially around the plants,
otherwise the roots of shallow plants
may be damaged.
To prevent possible damage to the
machine or trees, it should be guided in
such a way that the roots of trees are
avoided.
:Furrowing
Slowly pull the machine, moving
backwards. If necessary, repeat the
procedure several times to produce
deep furrows.
469BA017 KN
469BA018 KN
469BA019 KN
469BA020 KN

11BF-MM, BK-MM
English
:Working in soil additives
Humus soil, compost, leaves or other
organic substances and fertilizers can
be worked into the soil with this unit.
Before doing so, however, all remaining
roots, large plant parts and hard objects
(stones, etc.) must first be removed.
Spread the additives uniformly over the
ground.
Alternately move the unit backwards and
forwards when cultivating the soil.
Finally, level the ground with a rake.
Cleaning the rotor blades
Plant residues, such as roots, may
become firmly lodged between the
blades or wrap themselves around the
rotor while working.
To clean the rotor blades:
– Put on gloves
– Pull the spring clip out of the shaft
– Draw the rotor blades off the shaft
– Remove the roots, plants and soil
scraps
Refer to "Mounting the MultiTool" for
mounting instructions.
Cultivator spur 1)
:Mount the cultivator spur with screw
and knob on the right-hand side of
the flange
:Set the cultivator spur to the
required depth and screw it tight
The cultivator spur allows the power
tool to be guided comfortably and
without fatiguing. It brakes the
forward movement and reduces the
effort required to hold the power
tool.
On hard ground, the spur breaks up
the ridge between the rotor blades.
1) Special accessory
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.
469BA003 KN
Approved MultiEngines

12
English
BF-MM, BK-MM
Removing Existing MultiTools
:Wear gloves to reduce the risk of
injury from contact with sharp
MultiTools and/or hot surface of
gearbox.
:Remove the hitch pin and pull the
MultiTools (if fitted) 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 gearbox output 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 through 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
2
469BA043 KN
1
3

13BF-MM, BK-MM
English
Mounting the MultiTool
:Arrange the blades in the order they
will be fitted on the shaft, noting the
following points:
Left-hand and right-hand blades are
different. The direction of rotation is
marked with arrows on the gearbox
and blades. Make sure the arrows
point in the same direction.
:Rotate the inner right-hand blade (4)
on the shaft until it can be pushed
into position – check the direction of
rotation again (arrows).
The hub of the inner blade is larger
than that of the outer blade.
:Rotate the outer right-hand blade
(5) on the shaft until it can be
pushed into position – check the
direction of rotation again (arrows).
:Insert and engage hitch pin (6) in
the hole in the shaft – fold the hitch
pin flat against the blade.
:Use the same procedure to mount
the blades on the left-hand side.
Starting
:Secure the handlebar in the normal
operating position.
:Retract the wheels, if fitted
:Retract the spur, if fitted
: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 blades 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 the rotating
blades, always stand to the side of
the power tool, never in front of or
near the blades.
:With your left hand on the loop
handle, press the unit firmly against
the ground.
469BA029 KN
4
5
6
Starting / Stopping
the Engine
469BA023 KN

14
English
BF-MM, BK-MM
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 the slide control in direction of
the arrow ( h) to STOP – $.
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.
Minimize Wear and
Avoid Damage

15BF-MM, BK-MM
English
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:
– Rotor blades
– Rotor blade mounting hardware
– Deflector

16
English
BF-MM, BK-MM
Pick tines
1Outer right-hand blade
2Inner right-hand blade
3Inner left-hand blade
4Outer left-hand blade
9Hitch pin
Bolo tines
5Outer right-hand blade
6Inner right-hand blade
7Inner left-hand blade
8Outer left-hand blade
9Hitch pin
Main Parts
9
469BA031 KN
1235
4678
9

17BF-MM, BK-MM
English
Working tool
Weight
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 709 (in conjunction
with the specified MultiEngine: MM 55)
Done at Waiblingen,
January 3, 2005
Andreas Stihl AG & Co. KG
Steinhauser
Director
Group Product Management /
Engineering Services
Four rotor blades
Diameter: 230 mm
Working width: 220 mm
Four rotor blades with hub
Pick tines 2.0 kg
Bolo tines 2.0 kg
Specifications Maintenance and Repairs
Category: MultiTool
Make: STIHL
Model: BF-MM,
BK-MM
Series identification: 4106
Certificate of Conformity

18
English
BF-MM, BK-MM
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.
Quality Certification
000BA026

19BF-MM, BK-MM
English