Stihl BF-MM User manual

STIHL BF-MM, BK-MM Instruction Manual

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2021 0458-484-0121-A. VA0.J21. 0000000544_012_GB
BF-MM, BK-MM
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
Using the Unit 6
Approved MultiEngines 7
Mounting the MultiTool 8
Starting / Stopping the Engine 9
Storing the Machine 9
Maintenance and Care 10
Minimize Wear and Avoid Damage 10
Main Parts 11
Specifications 12
Maintenance and Repairs 12
Disposal 12

BF-MM, BK-MM
English
2
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.
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.
The machine should only be provided or
loaned to people familiar with this model
and its operation. The MultiEngine and
MultiTool user manuals should always
be handed over with the machine.
Use the pick tines or bolo tines only for
tilling previously cultivated, packed or
loose soil, furrowing and working in
mulches.
The machine must not be used for any
other purposes – risk of accidents!
Only use attachments and accessories
that are explicitly approved for this
power tool model by STIHL or are
technically identical. 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.
MultiSystem
469BA028 KN
+
+
Guide to Using this Manual Safety Precautions and
Working Techniques
Special safety precau-
tions must be observed
when working with the
cultivator because its
pointed and sharp-edged
rotor blades rotate at high
speed.
Both user manuals (Mul-
tiEngine and MultiTool)
must be read through
attentively before using
the unit for the first time
and kept in a safe place
for future reference. Non-
compliance with the user
manuals may cause seri-
ous or even fatal injury.

BF-MM, BK-MM
English
3
STIHL recommends the use of original
STIHL replacement parts. They are
specifically designed to match the
product and meet your performance
requirements.
The deflector on this power tool cannot
protect the operator from all objects
thrown by the attachment (stones, glass,
wire, etc.). Ejected objects may also
ricochet and strike the operator.
Never attempt to modify your power tool
in any way since this may increase the
risk of personal injury. STIHL excludes
all liability for personal injury and
damage to property caused while using
unauthorized attachments.
Do not use a high-pressure washer to
clean the power tool. The solid jet of
water may damage parts of the unit.
Clothing and equipment
Wear proper protective clothing and
equipment.
Do not wear clothing which could
become trapped in wood, brush or
moving parts of the machine. Do not
wear a scarf, necktie or jewelry. Tie up
and confine long hair above your
shoulders.
WARNING
Wear "personal" sound protection, e.g.
ear defenders.
STIHL can supply a comprehensive
range of personal protective equipment.
Transporting the machine
Always stop the engine.
Carry your power tool by the handle,
attachment in front of you. Retract the
cultivator spur, if fitted.
Do not touch hot parts of the machine –
risk of burn injury!
By vehicle: When transporting in a
vehicle, properly secure your machine to
prevent turnover, damage and fuel
spillage.
Before starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the
MultiEngine and MultiTool user
manuals.
–Rotor blades correctly fitted, secure
and in perfect condition (clean,
moves freely, not warped)
–Inspect the deflectors for damage
and wear. Do not operate the
machine with a damaged deflector –
replace damaged parts.
–Never attempt to modify the controls
or safety devices.
–Keep the handles dry and clean –
free from oil and dirt – this is
important for safe control of the
machine
–Swing the bike handle to the normal
operating position and tighten it
down firmly with the rotary knob.
See chapter on "Adjusting the Bike
Handle" in the MultiEngine user
manual.
To reduce the risk of personal injury, do
not operate your power tool if it is
damaged or not properly assembled!
Check the gearbox for correct position,
adjust if necessary. This helps reduce
the risk of injury from the MultiTool
rotating in the wrong direction.
Clothing must be sturdy
but allow complete free-
dom of movement. Wear
close-fitting clothes such
as a boiler suit, not a
loose jacket.
Wear safety boots with
steel toe caps and 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.
Wear sturdy protective
gloves made of a resist-
ant material (e. g.
leather).
469BA001 KN

BF-MM, BK-MM
English
4
See also notes on "Mounting the
MultiTool".
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
Holding and guiding the machine
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 moving the slide control
/ stop switch/button to 0or STOP.
To reduce the risk of injury from contact
with the tool and ejected objects, do not
allow any other persons within a radius
of 5 meters of your own position.This
distance must also be maintained in
relation to objects (vehicles, window
panes) – risk of property damage!
The correct engine idle speed is
important to ensure that the attachment
stops moving when you let go of the
throttle trigger. Check and correct the
idle speed setting at regular intervals. If
the attachment still rotates when the
engine is idling, have your dealer check
your machine and make proper
adjustments or repairs – see
MultiEngine user manual.
To reduce the risk of injury from thrown
objects or contact with the attachment,
never operate the unit without a properly
mounted deflector designed specifically
for the unit and the attachment.
Always stand behind the deflector or to
one side of the machine during
operation – never in front of the
attachment.
Take special care in slippery conditions
– damp, snow, ice, on slopes or uneven
ground.
Watch out for obstacles: Tree stumps,
roots – risk of tripping or stumbling!
Inspect the work area – solid objects
(stones, pieces of metal, etc.) may
damage the attachment.
Operate your power tool at normal
walking pace only.
Be extremely cautious when pulling the
power tool towards you because of the
risk of injury from contact with the
rotating attachment.
Make sure you always have a firm and
secure footing.
469BA045 KN
5m (16ft)
To avoid the risk of elec-
trocution, never use your
power tool in areas where
electrical lines are laid on
the surface or buried just
below the surface.Strik-
ing and damaging such
lines with the attachment
could cause serious or
even fatal injury.

BF-MM, BK-MM
English
5
Be extremely cautious when changing
direction with the power tool – especially
on slopes.
On slopes, always work parallel to the
gradient to reduce the risk of injury from
slipping or contact with the attachment.
Never work on steep slopes because of
the risk of injury through loss of control
of the power tool.
Take particular care when working close
to fences, walls, stones, roots, trees and
areas of dense growth. The rotor blades
may snag – risk of injury!
Be particularly alert and cautious when
wearing ear protection because your
ability to hear warnings (shouts, alarms,
etc.) is restricted.
Take breaks when you start getting tired
or feeling fatigue – risk of accidents!
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Proceed with caution, do not put
others in danger.
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". Make sure the safety
devices are working properly. Never use
a power tool that is no longer safe to
operate. In case of doubt, contact a
dealer.
Do not touch the attachment while the
engine is running. If the attachment
becomes jammed by an obstruction,
switch off the engine immediately before
attempting to remove the obstruction –
otherwise, risk of injury!
Opening the throttle while the
attachment is blocked increases the
load and reduces engine speed. The
clutch then slips continuously and this
causes overheating and damage to
important components (e.g. clutch,
polymer housing components) – and this
can increase the risk of injury from the
attachment moving while the engine is
idling.
Check the attachment at frequent and
regular intervals during operation, or as
soon as there is a noticeable change in
behavior:
–Shut off the engine, hold the
machine securely.
–Check condition and secure
position; look for cracks.
–Replace damaged working tools
immediately, even if they have only
superficial cracks.
Clean the attachment and deflector at
regular intervals during operation.
–Shut off the engine
–Use gloves
–Remove grass, weeds, clumps of
soil, etc.
To reduce the risk of injury, shut off the
engine before changing attachments.
Do not continue using or attempt to
repair damaged or cracked cutting
attachments by welding, straightening or
modifying the shape (out of balance).
After finishing work
After finishing work or before leaving the
power tool unattended: Shut off the
engine.
After finishing work, clean dirt, soil and
plant residue off the attachment – wear
gloves to reduce the risk of injury.
Do not use any grease solvents when
cleaning.
After thoroughly cleaning, coat metal
surface of attachments with a corrosion
inhibitor.
Maintenance and Repairs
Service the machine regularly. Do not
attempt any maintenance or repair work
not described in the MultiTool and
MultiEngine instruction manuals. 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 power tool. 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.

BF-MM, BK-MM
English
6
General
Cultivator MultiTools are available in
versions with pick tines (BF-MM) and
bolo tines (BK-MM).
Pick tines
Pick tines are particularly suitable for
tilling and loosening hard or packed soil.
Bolo tines
Not available in all markets.
Bolo tines are particularly suitable for
working cultivated, lighter soils.
Preparations
NSecure the handlebar in the normal
operating position.
NStart the engine.
Working Technique
The MultiEngine with rotor blades can
be operated forwards (1) or
backwards (2).
Choose the method and type of rotor
blade to suit your purpose, i.e. this
depends on the shape and size of the
area and soil conditions.
Working in an alternating backwards
and forwards motion is particularly
suitable for loosening packed soil.
Working in a steady backwards or
forwards motion is particularly suitable
for working loose soil.
The rotor blades may only be mounted
and operated in one position. Arrows on
the blades show the required direction of
rotation – see chapter on "Mounting the
MultiTool".
Typical Applications
NBreaking up soil
A few preparations are necessary before
you begin to break up soil which has
been previously tilled (e.g. last year's
vegetable or flower garden). First clear
away surface weeds and remains of
other plants as well as hard objects like
rocks, stones, bottles, pieces of wood
etc.
Hold the cultivator firmly with both hands
and till only a small area at a time to the
required depth.
Finish tilling the area by guiding the
cultivator in such a way that you leave
no footprints. Use a rake to level off the
entire area.
NLoosening soil around plants
Using the Unit
469BA015 KN
469BA017 KN
469BA018 KN
469BA016 KN
21
469BA019 KN

BF-MM, BK-MM
English
7
Only loosen the surface soil around
plants. Avoid going too deep as this
could damage the shallow roots of some
plants.
To avoid any damage to the cultivator or
trees, be wary not to catch the blades on
the large roots of trees.
NWorking in soil improvers
The cultivator can be used for mulching
with loam, compost, leaves, other
organic material or fertilizers.
Prepare the area by removing all old
roots, the remains of large plants and
hard objects (stones etc.). Spread the
mulch evenly on the ground.
Work in the mulch with a back and forth
motion.
Finish off by leveling the area with a
rake.
NTrenching or furrowing
Walk slowly backward and pull the
cultivator to create the furrow required.
Repeat as necessary to obtain deeper
furrows.
Cleaning the rotor blades
Parts of plants, e.g. roots, can become
tightly wrapped around or between the
rotor blades during operation. To clean
the rotor blades:
–Wear gloves.
–Pull the hitch pins out of the axle.
–Pull the rotor blades off the shaft.
–Remove roots, plants and soil.
Refer to "Mounting the MultiTool" for
mounting instructions.
Cultivator spur (special accessory)
The cultivator spur simplifies control and
makes operation of the power tool less
tiring. It slows the forward motion and
reduces the effort required to hold the
power tool.
The spur breaks up the ridge between
the rotor blades when tilling hard soil.
NUse the screw and knob to mount
the cultivator spur to the right-hand
side of the flange.
NSet the spur to the required depth
and tighten it down firmly.
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.
469BA020 KN
469BA003 KN
Approved MultiEngines

BF-MM, BK-MM
English
8
Removing Existing MultiTools
WARNING
Wear gloves to reduce the risk of injury
from contact with sharp MultiTools
and/or hot surface of gearbox.
NRemove the hitch pin and pull the
MultiTools (if fitted) off the shaft –
see also "Mounting the MultiTool" in
the instruction manual of the other
MultiTool.
NClean the gearbox if necessary.
Checking Position of Gearbox
WARNING
To reduce risk of injury from the
MultiTool rotating in the wrong direction,
check that position of gearbox is correct
and adjust if necessary.
Gearbox output shaft (1) below the drive
tube (2).
Direction of rotation (3) of MultiTool.
Adjusting Position of Gearbox
NLoosen clamp screws on gearbox.
NTurn the gearbox through 180°.
NLine up the gearbox in the correct
position.
NTighten down the two clamp screws
on the gearbox in the following
sequence:
–Tighten the first screw moderately.
–Tighten the second screw
moderately.
–Tighten down first screw firmly.
–Tighten down second screw firmly.
NOTICE
It must not be possible to rotate the
gearbox on the drive tube.
Mounting the MultiTool
NArrange 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.
NRotate 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.
NRotate the outer right-hand
blade (5) on the shaft until it can be
pushed into position – check the
direction of rotation again (arrows).
NInsert and engage the hitch pin (6)
in the hole in the shaft – fold the
hitch pin flat against the blade.
NUse the same procedure to mount
the rotor blades on the left-hand
side.
Mounting the MultiTool
481BA008 KN
2
469BA043 KN
1
3
481BA011 KN
469BA029 KN
4
5
6

BF-MM, BK-MM
English
9
Starting the Engine
Always follow the starting procedure
described in the MultiEngine instruction
manual.
NSecure the handlebar in the normal
operating position.
NRetract the wheels, if fitted – see
chapter on "Wheels" in MultiEngine
instruction manual.
NRetract the spur, if fitted.
NCheck that the MultiTool is not
touching the ground or any other
obstacles. The unit must rest on the
engine flange and the support on
the frame.
NMake sure you have good balance
and secure footing – as shown in the
illustration.
WARNING
To reduce the risk of injury from contact
with the rotating attachment, always
stand to the side of the power tool, never
in front of the attachment.
NWith your left hand on the loop
handle, press the unit firmly against
the ground – do not touch the
throttle trigger or lockout lever.
NOTICE
Do not stand or kneel on the handlebar
or frame.
WARNING
The attachment may begin to move as
soon as the engine starts. For this
reason, blip the throttle after starting –
the engine returns to idling speed.
Now follow the starting procedure
described in the MultiEngine instruction
manual.
Stopping the Engine
NSee MultiEngine instruction manual.
For periods of about 30 days or longer
NRemove, clean and inspect the rotor
blades.
NCoat metal parts of interchangeable
attachment with corrosion-inhibiting
oil.
NStore the machine in a dry and
secure location Keep out of the
reach of children and other
unauthorized persons
Starting / Stopping the
Engine
469BA061 AS
469BA062 AS
Storing the Machine

BF-MM, BK-MM
English
10
The following intervals apply to normal
operating conditions only. If your daily
working time is longer or operating
conditions are difficult (very dusty work
area, etc.), shorten the specified
intervals accordingly.
All accessible screws and nuts
NRetighten if necessary
Sweeping attachments and deflectors
NVisual inspection, check tightness
before starting work and after every
refueling stop
NReplace if damaged
Safety labels
NReplace illegible safety labels
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 tools or accessories which
are neither approved or suitable for
the product or are of a poor quality.
–Using the product for purposes for
which it was not designed.
–Using the product for sports or
competitive events.
–Consequential damage caused by
continuing to use the product with
defective components.
Maintenance Work
All the operations described in the
chapter on "Maintenance and Care"
must be performed on a regular basis. If
these maintenance operations cannot
be performed by the owner, they should
be performed by a servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
If these maintenance operations are not
carried out as specified, the user
assumes responsibility for any damage
that may occur. Among other parts, this
includes:
–Corrosion and other consequential
damage resulting from improper
storage.
–Damage to the product resulting
from the use of poor quality
replacement parts.
Maintenance and Care Minimize Wear and Avoid
Damage

BF-MM, BK-MM
English
11
1Outer, right-hand rotor blade
2Inner, right-hand rotor blade
3Inner, left-hand rotor blade
4Outer, left-hand rotor blade
5Hitch pin
Main Parts
5
123
1
4
2 3 4
5
484BA001 KN
BF
BK

BF-MM, BK-MM
English
12
Cultivator Blades
Weight
REACH
REACH is an EC regulation and stands
for the Registration, Evaluation,
Authorisation and Restriction of
Chemical substances.
For information on compliance with the
REACH regulation (EC) No. 1907/2006
see www.stihl.com/reach.
Users of this machine may only carry out
the maintenance and service work
described in this user manual. All other
repairs must be carried out by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer. STIHL dealers are
regularly given the opportunity to attend
training courses and are supplied with
the necessary technical information.
When repairing the machine, only use
replacement parts which have been
approved by STIHL for this power tool or
are technically identical. Only use high-
quality replacement parts in order to
avoid the risk of accidents and damage
to the machine.
STIHL recommends the use of original
STIHL replacement parts.
Original STIHL parts can be identified by
the STIHL part number, the {
logo and the STIHL parts symbol K
(the symbol may appear alone on small
parts).
Observe all country-specific waste
disposal rules and regulations.
STIHL products must not be thrown in
the garbage can. Take the product,
accessories and packaging to an
approved disposal site for environment-
friendly recycling.
Contact your STIHL servicing dealer for
the latest information on waste disposal.
Specifications
Four rotor blades, double-edged, rotate
in same direction
Diameter of pick tine: 230 mm
Diameter of bolo tine: 210 mm
Working width: 220 mm
Four rotor blades with hub
Pick tines: 2.0 kg
Bolo tines: 2.0 kg
Maintenance and Repairs Disposal
000BA073 KN

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0458-484-0121-A
0458-484-0121-A
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