Technical Information · issue 56 of 2002
Technical Description; Specifications; Mounting the MultiTools; Air Filter; Special Optional Accessories; Service Note; Summary
IssueTI 56/2002
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Technical Information
56.2002
New STIHL MM 55 MultiEngine – Series 4601
New STIHL BF-MM, BK-MM MultiTools – Series 4601
Contents
1. Technical Description
2. Specifications
3. Mounting the MultiTools
4. Air Filter
5. Special Optional Accessories
6. Service Note
7. Summary
The new STIHL MM 55 MultiEngine is a universal The MultiEngine MM 55 with the BF-MM pick tine
unit for a range of different applications. cultivator is designed for both occasional and
It comes standard with the BF-MM cultivator municipal users.
MultiTool. Further MultiTools will be available by the
Typical applications are breaking up and loosening
end of 2003.
previously cultivated soil, trenching or furrowing and
working in soil improvers.
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)m~ge 2 Technical Information 56.2002
. Universal unit for wide range of applications,
different MultiTools can be used.
. MultiTools are quickly changed and cleaned.
. Folding handle for simple transportation.
. Space-saving storage. Folded unit can be hung
on a wall.
. Low weight for easy handling; extra weights
available as special accessory.
469TI001 KN
. MM 55 with BF-MM / BK-MM MultiTool
Working width of 8.9 in (220 mm).
Left: BF-MM pick tine cultivator
Right: BK-MM bolo tine cultivator
1. Technical Description
The worm gear reduces the output shaft speed of
the MM 55 to 190 rpm for tilling soil.
2. Specifications
The MultiTools consist of 4 rotor blades with hub
which are mounted on the gearbox output shaft. The Single cylinder two-stroke engine
MultiTools are held in position by a spring clip and
can be changed quickly and simply.
Displacement:
Bore:
1.66 cu.in (27.2 cm3)
1.34 in (34 mm)
1.1 Engine Stroke: 1.18 in (30 mm)
The MM 55 MultiEngine uses the time-proven series Engine power to
ISO 8893: 1 bhp (0.75 kW)
4140 engine.
Idle speed: 2,800 rpm
1.2 Gearbox Max. engine speed: 8,400 rpm
The single-stage worm gear is lubricated for life. Max. output
The gear ratio is 44:1. shaft speed
(working tool) 190 rpm
1.3 Approved MultiTools
The following STIHL MultiTools may be mounted to
Ignition system
the MM 55 MultiEngine:
Type: Electronic magneto ignition system
MultiTool Part No.
Spark plug (resistor Bosch WSR 6 F,
BF-MM pick tine cultivator 4601 740 4605
type): NGK BPMR 7 A
BK-MM bolo tine cultivator 4601 740 4606
Electrode gap: 0.020 in (0.5 mm)
The MM 55 comes standard with the BF-MM Spark plug thread: M 14 x 1.25;
MultiTool (pick tine cultivator) already mounted. 0.375 in long
Further MultiTools will be available in the future. (9.5 mm)
Fuel system
Carburetor: All position diaphragm carburetor with
integral fuel pump
Air filter: Oil-impregnated main
filter, felt prefilter
Fuel tank capacity: 0.7 US.pt (0.33 l)
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Technical Information 56.2002 Page 3
Fuel mixture: Brand-name grade . Rotate the inner, right-hand blade (2) on the
gasoline (pump octane shaft until it can be pushed into position – check
89) and brand-name two- the arrows showing the direction of rotation.
stroke air cooled engine The hub of the inner blade is larger than that of the
oil with the classification outer blade.
TC
. Rotate outer, right-hand blade (3) on the shaft
Mix ratio: 50:1 with STIHL 50:1 until it can be pushed into position – check the
engine oil arrows showing the direction of rotation.
. Insert and engage spring clip in the hole at the
Weight
end of the shaft – fold the spring clip flat against
MM 55 without 16.3 lbs (7.4 kg) the blade.
MultiTool
. Use the same procedure to mount the rotor
MM 55 with 20.7 lbs (9.4 kg) blades on the left-hand side.
MultiTool
BF-MM pick tine 4.4 lbs (2.0 kg) 4. Air Filter
cultivator
BK-MM bolo tine 4.4 lbs (2.0 kg)
cultivator
MultiTools
Working width: 8.9 in (220 mm)
Diameter BF-MM 9 in (230 mm)
6
Diameter BK-MM 8.1 in (205 mm)
3. Mounting the MultiTools 5
469TI003 KN
Air filter assembly 4601 007 1007 is used in the
MM 55 because of the high level of dust in cultivator
operations.
An oil-impregnated main filter (5), which retains fine
469TI002 KN
3 2 dust, is installed in the filter housing (6) together with
the felt prefilter (4).
. Always wear gloves when working with the Always replace the felt prefilter and main filter as an
MultiTool. assembly when servicing. Do not clean, dirt can
. Pull out the spring clip (1) – do not remove the remain in filter element even after cleaning and lead
washer from the shaft. to expensive engine damage.
Arrange the rotor blades in the order they will be
fitted on the shaft, noting the following points:
Left-hand and right-hand rotor blades are different.
The direction of rotation is marked with arrows on
the gearbox and rotor blades, which must match
with each other.
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5. Special Optional Accessories 5.2 Bolo tine cultivator MultiTool
The bolo tine cultivator 4601 740 4606 can be used
5.1 Extra weights as an alternative to the pick tine cultivator. It is
The MultiEngine can be retrofitted with the optional particularly suitable for digging in previously
weights 4601 730 4500 to increase the down cultivated, loose soil.
pressure on the MultiTool.
469TI006 KN
1 2
469TI004 KN
5.1.1 Mounting the extra weights 5.3 Spur
Remove the weights from the side without the
square face as follows:
Spur 4601 740 4800 is available for convenient
control of the power tool with bolo tine cultivator.
. Take the screw out of the outer weight and It slows forward movement and reduces the effort
remove the weight. required to hold the unit.
. Unscrew the inner weight and remove it from the The spur can be adjusted to the required depth.
bolt.
. Insert the extra weight with bolt (1) through the
hole (2) in the flange and rotate it at the same
time until its square face engages the recess in
the flange.
. Screw the weight onto the bolt and tighten it
down firmly.
. Tighten down the outer weight with the screw.
469TI005 KN
Use the combination wrench to release and tighten
the weights.
One or two 4.4-lb (2kg) weights may be mounted on
The spur is mounted to the right-hand side of the
each side to suit requirements.
flange with the screw and star knob.
The maximum permissible total extra weight is
8.8 lbs (4 kg). A higher weight may result in damage
to the unit.
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Technical Information 56.2002 Page 5
6. Service Note
The throttle cable is protected and not kinked in
either the normal operating position or when the
handlebar is folded down.
The throttle cable must be routed as follows to 4
ensure troublefree operation:
. through the loop handle (1)
3
. through the throttle cable retainer (2) on the
frame
. under the crossmember (3)
. through the throttle cable retainer (4) on the 1 2
outside of the handlebar.
469TI007 KN
7. Summary
Item Part Name Part No.
1 BF-MM pick tine cultivator 4601 740 4605
2 BK-MM bolo tine cultivator 4601 740 4606
3 Extra weight 4601 730 4500
4 Spur 4601 740 4800
5 Air filter assembly 4601 007 1007
© 2002 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-ja 7711
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.