Makita RBC3100 User guide

GB Brush Cutter String Trimmer
DMotorsense Rasentrimmer
PL Wykaszarka Wykaszarka
HU Bozótvágó Szegélynyíró
RO Motocoasăpentru tufişuri Motocoasăcu fir
SK Krovinorez Strunová kosačka
CZ Křovinořez Strunová sekačka
UA Кущоріз Кордова газонокосарка
RBC3101
ORIGINAL INSTRUCTION MANUAL
ORIGINLBEDIENUNGSANLEITUNG
ORYGINALNA INSTRUKCJA OBSŁUGI
EREDETI HASZNÁLATI ÚTMUTATÓ
MANUAL DE INSTRUCŢIUNI ORIGINAL
PÔVODNÝ NÁVOD NA OBSLUHU
ORIGINÁLNÍ NÁVOD K OBSLUZE
ОРИГІНАЛЬНІ ІНСТРУКЦІЇ ЗЕКСПЛУАТАЦІЇ
RBC3100 RBC3110

2
Important:
Read this instruction manual carefully before putting the Brush Cutter/String Trimmer into operation and strictly observe the
safety regulations!
Preserve instruction manual carefully!
Wichtig:
Lesen Sie diese Betriebsanleitung vor der Inbetriebnahme der Motorsense bsw. des Rasentrimmers aufmerksam durch und
halten Sie die Sicherheitsvorschriften genau ein!
Bewahren Sie diese Betriebsanleitung sorgfältig auf!
Ważne:
Przeczytaćuważnie niniejsząinstrukcjęobsługi przed uruchomieniem wykaszarki i ściśle przestrzegaćprzepisów
dotyczących bezpieczeństwa!
Przechowywaćniniejszy podręcznik z należytąstarannością!
Fontos:
A bozótvágó/szegélynyíró elsőüzembe helyezése előtt figyelmesen olvassa át ezt a használati utasítást, és szigorúan
tartsa be a biztonsági előírásokat!
Gondosan őrizze meg a használati utasítást!
Important:
Citiţi cu atenţie acest manual de instrucţiuni înainte de a pune în funcţiune motocoasa pentru tufişuri/motocoasa cu fir şi
respectaţi cu stricteţe reglementările privind siguranţa!
Păstraţi cu atenţie manualul de instrucţiuni!
Dôležité:
Pred uvedením krovinorezu/strunovej kosačky do prevádzky si pozorne prečítajte tento návod na obsluhu a striktne
dodržiavajte bezpečnostné nariadenia!
Tento návod na obsluhu starostlivo uschovajte!
Důležité:
Před uvedením křovinořezu/strunové sekačky do provozu si pečlivěprostudujte tento návod k obsluze a pečlivědodržujte
bezpečnostní směrnice!
Návod k obsluze pečlivěuschovejte!
Важливо:
Уважно прочитайте цю інструкцію перед роботою зкущорізом/кордовою газонокосаркою та строго дотримуйтесь
правил безпеки!
Зберігайте цю інструкцію!

3
ENGLISH (Original instructions)
Thank you very much for purchasing the MAKITA Brush Cutter/String
trimmer.
We are pleased to recommend to you the MAKITA Brush Cutter/
String trimmer which is the result of a long development programme
and many years of knowledge and experience.
Please read this booklet which refers in detail to the various points
that will demonstrate its outstanding performance. This will assist you
to obtain the best possible result from your MAKITA Brush Cutter/
String trimmer.
Table of Contents Page
Symbols.............................................................................................3
Safety instructions .............................................................................4
Technical data ...................................................................................8
Designation of parts...........................................................................9
Assembly of engine and shaft..........................................................10
Mounting of handle..........................................................................11
Mounting of protector.......................................................................12
Mounting of cutter blade or nylon cutting head................................13
Fuels/refuelling ................................................................................14
Correct handling of machine............................................................15
Points in operation and how to stop.................................................15
Resharpening the cutting tool..........................................................16
Servicing instructions.......................................................................18
Storage............................................................................................20
You will note the following symbols when reading the instructions manual.
SYMBOLS
Read Instruction Manual Wear eye and ear protection
(for String trimmer only)
Take Particular care and Attention Wear protective helmet, eye and ear protection
(for Brush cutter only)
Forbidden Do not use metal blades
(for String trimmer only)
Keep distance Top permissible tool speed
Flying object hazard Fuel and oil mixture
No Smoking Engine-manual start
No open flame Emergency stop
Protective gloves must be worn First aid
Kickback Recycling
Keep the area of operation clear of all
persons and pets ON/START
Wear sturdy boots with nonslip soles.
Steeltoed safety boots are recommended. OFF/STOP

4
General instructions
- To ensure correct operation, user has to read this instruction manual to make
himself familiar with the handling of the Brush Cutter/String trimmer. Users
insufficiently informed will risk danger to themselves as well as others due to
improper handling.
- It is recommended only to lend the Brush Cutter/String trimmer to people who
have proven to be experienced with Brush Cutter/String trimmers.
Always hand over the instruction manual.
- First users should ask the dealer for basic instructions to familiarize oneself with
the handling of an engine powered cutter.
- Children and young persons aged under 18 years must not be allowed to operate
the Brush Cutter/String trimmer. Persons over the age of 16 years may however
use the device for the purpose of being trained only whilst under supervision of a
qualified trainer.
- Use Brush Cutter/String trimmers with the utmost care and attention.
- Operate the Brush Cutter/String trimmer only if you are in good physical condition.
Perform all work calmly and carefully. The user has to accept liability for others.
- Never use the Brush Cutter/String trimmer after consumption of alcohol or drugs,
or if feeling tired or ill.
- National regulation can restrict the use of the machine.
Intended use of the machine
- The Brush Cutter/String trimmer is only intended for cutter grass, weeds, Bushes,
undergrowth it should not be used for any other purpose such as Edging or hedge
cutting as this may cause injury.
Personal protective equipment
- The clothing worn should be functional and appropriate, i.e. it should be tight-
fitting but not cause hindrance. Do not wear either jewelry or clothing which could
become entangled with bushes or shrubs.
- In order to avoid either head-, eye-, hand-or foot injuries as well as to protect your
hearing the following protective equipment and protective clothing must be used
during operation of the Brush Cutter/String trimmer.
- Always wear a helmet where there is a risk of falling objects. The protective
helmet (1) is to be checked at regular intervals for damage and is to be replaced at
the latest after 5 years. Use only approved protective helmets.
- The visor (2) of the helmet (or alternatively goggles) protects the face from flying
debris and stones. During operation of the Brush Cutter/String trimmer always
wear goggles, or a visor to prevent eye injuries.
- Wear adequate noise protection equipment to avoid hearing impairment (ear
muffs (3), ear plugs etc.).
- The work overalls (4) protect against flying stones and debris.
We strongly recommend that the user wears work overalls.
- Special gloves (5) made of thick leather are part of the prescribed equipment and
must always be worn during operation of the Brush Cutter/String trimmer.
- When using the Brush Cutter/String trimmer, always wear sturdy shoes (6) with a
non-slip sole. This protects against injuries and ensures a good footing.
Starting up the brush cutter
- Please make sure that there are no children or other people within a working
range of 15 meters (49 ft), also pay attention to any animals in the working vicinity.
- Before use always check that the Brush Cutter/String trimmer is safe for operation:
Check the security of the cutting tool, the control lever for easy action and check
for proper functioning of the control lever lock.
- Rotation of the cutting tool during idling speed is not allowed. Check with your
dealer for adjustment if in doubt. Check for clean and dry handles and test the
function of the start/stop switch.
SAFETY INSTRUCTIONS
Diagrammatic figure
15 meters

5
Start the Brush Cutter/String trimmer only in accordance with the instructions.
- Do not use any other methods for starting the engine!
- Use the Brush Cutter/String trimmer and the tools only for such applications as
specified.
- Only start the Brush Cutter/String trimmer engine, after the entire assembly is
done. Operation of the device is only permitted after all the appropriate
accessories are attached!
- Before starting make sure that the cutting tool has no contact with hard objects
such as branches, stones etc. as the cutting tool will revolve when starting.
- The engine is to be switched off immediately in case of any engine problems.
- Should the cutting tool hit stones or other hard objects, immediately switch off the
engine and inspect the cutting tool.
- Inspect the cutting tool at short regular intervals for damage (detection of hairline
cracks by means of tapping-noise test).
- Operate the Brush Cutter/String trimmer only with the shoulder strap attached
which is to be suitably adjusted before putting the Brush Cutter/String trimmer into
operation. It is essential to adjust the shoulder strap according to the user’s size to
prevent fatigue occurring during use. Never hold the cutter with one hand during
use.
- During operation always hold the Brush Cutter/String trimmer with both hands.
Always ensure a safe footing.
- Operate the Brush Cutter/String trimmer in such a manner as to avoid inhalation of
the exhaust gases. Never run the engine in enclosed rooms (risk of gas
poisoning). Carbon monoxide is an odorless gas.
- Switch off the engine when resting and when leaving the Brush Cutter/String
trimmer unattended, and place it in a safe location to prevent danger to others or
damage to the machine.
- Never put the hot Brush Cutter/String trimmer onto dry grass or onto any
combustible materials.
- The cutting tool has to be equipped with it’s appropriate guard.
Never run the cutter without this guard!
- All protective installations and guards supplied with the machine must be used
during operation.
- Never operate the engine with faulty exhaust muffler.
- Shut off the engine during transport.
- During transport over long distances the tool protection included with the
equipment must always be used.
- Ensure safe position of the Brush Cutter/String trimmer during car transportation
to avoid fuel leakage.
- When transporting the Brush Cutter/String trimmer, ensure that the fuel tank is
completely empty.
- When unloading the Brush Cutter/String trimmer from the truck, never drop the
Engine to the ground or this may severely damage the fuel tank.
- Except in case of emergency, never drop or cast the Brush Cutter/String trimmer
to the ground or this may severely damage the Brush Cutter/String trimmer.
- Remember to lift the entire equipment from the ground when moving the
equipment. Dragging the fuel tank is highly dangerous and will cause damage and
leakage of fuel, possibly causing fire.
Refuelling
- Shut off the engine during refuelling, keep away from open flames and do not
smoke.
- Avoid skin contact with mineral oil products. Do not inhale fuel vapor. Always wear
protective gloves during refuelling. Change and clean protective clothing at regular
intervals.
- Take care not to spill either fuel or oil in order to prevent soil contamination
(environmental protection). Clean the Brush Cutter/String trimmer immediately
after fuel has been spilt.
- Avoid any fuel contact with your clothing. Change your clothing instantly if fuel has
been spilt on it (to prevent clothing catching fire).
- Inspect the fuel cap at regular intervals making sure that it can be securely
fastened and does not leak.
- Carefully tighten the fuel tank cap. Change location to start the engine (at least
3 meters away from the place of refuelling).
- Never refuel in closed rooms. Fuel vapors accumulate at ground lever (risk of
explosions).
- Only transport and store fuel in approved containers. Make sure the fuel stored is
not accessible to children.
• Resting
• Transport
• Refuelling
• Maintenance
• Tool Replacement
3 meters

6
Method of operation
- Only use the Brush cutter/String trimmer in good light and visibility. During the
winter season beware of slippery or wet areas, ice and snow (risk of slipping).
Always ensure a safe footing.
- Never cut above waist height.
- Never stand on a ladder and run the Brush cutter/String trimmer.
- Never climb up into trees to perform cutting operation with the Brush cutter/String
trimmer.
- Never work on unstable surfaces.
- Remove sand, stones, nails etc. found within the working range.
Foreign particles may damage the cutting tool and can cause dangerous kick-
backs.
- Before commencing cutting, the cutting tool must have reached full working
speed.
Kickback
- When operating the brush cutter, uncontrolled kickback may occur.
- This is particularly the case when attempting to cut within a blade segment
between 12 and 2 o’clock.
- Never apply the brush cutter within a segment between 12 and 2 o’clock.
- Never apply this segment of the brush cutter blade to solids, such as bushes and
trees, etc., having a diameter in excess of 3 cm or the brush cutter will be
deflected at great force with the risk of injuries.
Kickback prevention
To avoid kickbacks, observe the following:
- Operation within a blade segment between 12 and 2 o’clock presents positive
hazards, especially when using metal cutting tools.
- Cutting operations within a blade segment between 11 and 12 o’clock, and
between 2 and 5 o’clock, must only be performed by trained and experienced
operators, and then only at their own risk.
Easy cutting with almost no kickback is possible within a blade segment between
8 and 11 o’clock.
Cutting Tools
Employ only the correct cutting tool for the job in hand.
RBC3100/3101 with cutter blade (Star Blade (4 teeth), Eddy Blade (8 teeth)),
RBC3110 with Nylon cutting head.
For cutting thick materials, such as weed, high grass, bushes, shrubs, underwood,
thicket etc. (max. 2 cm dia. thickness). Perform this cutting work by swinging the
brush cutter evenly in half-circles from right to left (similar to using a scythe).
Maintenance instructions
- The condition of the cutter, in particular of the cutting tool of the protective devices
and also of the shoulder strap must be checked before commencing work.
Particular attention is to be paid to the cutting blades which must be correctly
sharpened.
- Turn off the engine and remove spark plug connector when replacing or
sharpening cutting tools, and also when cleaning the cutter or cutting tool.
Caution: Kickback
Diagrammatic
figure
Diagrammatic
figure

7
Never straighten or weld damaged cutting tools.
- Operate the Brush cutter/String trimmer with as little noise and contamination as
possible. In particular check the correct setting of the carburetor.
- Clean the Brush cutter/String trimmer at regular intervals and check that all screws
and nuts are well tightened.
- Never service or store the Brush cutter/String trimmer in the vicinity of naked
flames.
- Always store the Brush cutter/String trimmer in locked rooms and with an emptied
fuel tank.
Observe the relevant accident prevention instructions issued by the relevant trade
associations and by the insurance companies.
Do not perform any modifications on the Brush cutter/String trimmer as this will
endanger your safety.
The performance of maintenance or repair work by the user is limited to those
activities as described in the instruction manual. All other work is to be done by an
Authorized Service Agent. Use only genuine spare parts and accessories released
and supplied by MAKITA.
Use of non-approved accessories and tools means increased risk of accidents.
MAKITA will not accept any liability for accidents or damage caused by the use of
non-approved cutting tools and fixing devices of cutting tools, or accessories.
First Aid
In case of accident make sure that a first-aid box is available in the vicinity of the
cutting operations. Immediately replace any item taken from the first aid box.
When asking for help, please give the following information:
- Place of accident
- What happened
- Number of injured persons
- Kind of injuries
- Your name
Packaging
The MAKITA Brush cutter/String trimmer will be delivered in two protective
cardboard boxes to prevent transport damage. Cardboard is a basic raw material
and is therefore consequently reusable or suitable for recycling (waste paper
recycling).
EC-DECLARATION OF CONFORMITY
Brush cutter / String trimmer: model RBC3100, RBC3101, RBC3110 (See TECHNICAL DATA for the specifications)
We declare under our sole responsibility that this product is in compliance with the following Directives, 2000/14/EC, 2006/42/EC.
The most important standards applied to properly meet the requirements of the above Directives were: EN11806.
Measured Sound Power: 111 dB
Guarantee Sound Power: 115 dB
These sound power levels were measured in accordance with Council Directive, 2000/14/EC.
Conformity assessment procedure: Annex V.
3rd. NOV. 2009
Tomoyasu Kato
Director
Responsible Manufacturer:
Makita Corporation
3-11-8, Sumiyoshi-cho, Anjo, Aichi, JAPAN
Authorized Representative in Europe:
Makita International Europe Ltd.
Michigan Drive, Tongwell, Milton Keynes, Bucks MK15 8JD, ENGLAND

8
TECHNICAL DATA RBC3100, RBC3101, RBC3110
Model RBC3100 RBC3101 RBC3110
U handle E handle Loop handle
Dimensions: length x width x height
(without cutting blade) mm 1,800 x 620 x 430 1,800 x 600 x 435 1,800 x 350 x 250
Mass
(without plastic guard and cutting blade) kg 5.5 5.5 5.4
Volume (fuel tank) L 0.8
Engine displacement cm330.5
Maximum engine performance kw 0.95 at 7,000 min-1
Engine speed at recommended max. spindle speed min-1 10,000
Maximum spindle speed (corresponding) min-1 6,800
Maximum fuel consumption kg/h –
Maximum specific fuel consumption g/kwh –
Idling speed min-1 2,800
Clutch engagement speed min-1 3,700
Carburetor type WALBRO WYJ
Ignition system type Solid state ignition
Spark plug type NGK BMR7A
Electrode gap mm 0.6 – 0.7
Vibration per
ISO 22867
Right handle
(Rear grip) ahv eq m/s24.6 5.2 5.9
Uncertainty K m/s20.5 0.6 0.4
Left handle
(Front grip) ahv eq m/s24.4 5.5 8.3
Uncertainty K m/s20.8 0.4 0.9
Sound pressure level average to
ISO 22868 LPA eq dBA 90.6 90.6 95.2
Uncertainty K dBA 2.4 2.4 2.3
Sound power level average to
ISO 22868 LWA eq dBA 100.9 100.9 106.9
Uncertainty K dBA 1.4 1.4 2.8
Fuel Mixed gas (gasoline: Makita Genuine Two-stroke Engine Oil = 50:1)
Gear ratio 13/19

9
DESIGNATION OF PARTS
(5)
(3)
(19)
(1)
(21)
(12)
(9)
(10)
(16)
(4)
(11)
(13)
(15)
(17)
(14)
(12)
(9)
(10)
(16)
(4)
(11)
(13)
(15)
(17)
(14) (12)
(4)
(11) (8)
(13)
(15)
(18) (14)
(9)
(10)
(22)
(20)
(2)
(6)
(23)
(7)
GB DESIGNATION OF PARTS
1 Fuel Tank
2 Rewind Starter
3 Air Cleaner
4 I-O Switch (on/off)
5 Spark Plug
6 Exhaust Muffler
7 Clutch Case
8 Rear Grip
9 Hanger
10 Handle
11 Control Lever
12 Control Cable
13 Shaft
14 Protector
15 Gear Case
16 Handle Holder
17 Cutter Blade
18 Nylon Cutting Head
19 Fuel Filler Cap
20 Starter Knob
21 Primmer Pump
22 Choke Lever
23 Exhaust Pipe
RBC3100
U Handle Type
RBC3101
E Handle Type
RBC3110
Loop Handle Type

10
CAUTION: Before doing any work on the brush cutter, always switch off the motor
and pull the spark plug connector off the spark plug.
Always wear protective gloves.
CAUTION: Start the brush cutter only after having assembled it completely.
- Loosen the two bolts (1) and insert the main pipe (2) into the case clutch (3).
- Insert it up to the arrow-mark position. (Refer to the sketch on the right.) If it is
difficult to insert, turn the spline (4) a little and re-insert.
- Match the hole (5) of the main pipe (2) with the bolt hole (6) of the case clutch, and
tighten the attached bolts (7).
- Tighten the two bolts (1) uniformly on the right and left by Allen wrench supplied.
How to mount the control cable
- Remove the air cleaner cover.
- Put the control cable (8) into the adjusting cable (9). Shift the swivel (10) and put
the cable into the swivel. At this time, be careful that the round hole in the swivel is
oriented toward the fitting at the inner wire end.
- Release the swivel and make sure that the inner wire fitting is placed in the hole.
- Mount the air cleaner cover.
Connection of the switch cord
Connect the switch cords to the two cords from the engine by inserting one into the
other.
- Fix the cord connector by clamp.
ASSEMBLY OF ENGINE AND SHAFT
Control cable
Swivel
Round hole End fitting
Insert
Clamp Connectors

11
CAUTION: Before doing any work on the brush cutter, always stop the engine and
pull the spark plug connector off the spark plug.
Always wear protective gloves!
CAUTION: Start the brush cutter only after having assembled it completely.
For machines with U Handle models
- Place the handle-fixing metal so that the handle with the control lever will be
positioned on the right (the right-hand grip side) as viewed from the engine side,
and the other handle on the left side.
- Fit the groove of the handle-fixing material to the handle end. Fix provisionally the
attached metal by hexagon socket bolt supplied.
- Adjust the handle to an easy-to-operate position, and tighten securely the four
hexagon socket bolts uniformly on the right and left by Allen wrench.
For machines with E Handle models
- Temporarily assemble four M5 x 25 socket head bolts (1) on the handle joint (2) so
that the handle (3) with a control lever will come to your right hand side.
- Adjust the handle to an easy-to handle position and tighten the socket head bolts
(1) with even pressure applied on all of them.
- Fit the control cable (together with the earth cord) to the handle with two clips (4)
and hanger.
- Avoid any tendency of the control cable to loop at the handle bar.
For machines with Loop Handle models
- Fix a barrier to the left side of the machine together with the handle for operator’s
protection.
- Do not adjust position of the loop handle too close to the control grip.
Keep not less than 250 mm distance between the handle and the grip.
(a distance collar is provided for this purpose.)
Adjustment of control cable
Make adjustment so that the control cable will be provided with a play of 1 to 2 mm,
when the throttle lever is set to low speed by carburetor adjusting bolt.
(the blade or the nylon cutting head must not turn when the engine is on idle)
MOUNTING OF HANDLE
RBC3100
RBC3101
RBC3100/3101
Hanger
Control cable
RBC3110
to Engine
Adjusting bolt
1 – 2 mm

12
To meet the applicable safety provisions, only the tool/protector combinations as
indicated in the table must be used.
Be sure to use genuine MAKITA cutter blades or nylon cutting head.
- The cutter blade must be well polished, free of cracks or breakage. If the cutter
blade hits against a stone during operation, stop the engine and check the blade
immediately.
- Polish or replace the cutter blade every three hours of operation.
- If the nylon cutting head hits against a stone during operation, stop the engine and
check the nylon cutting head immediately.
- Fix the protector (1) to the clamp (3) with two bolts M6 x 30 (2).
- When using the string head, fit the protector (6) into the protector (1), and tighten
them with two nuts (5) and two screws (4).
MOUNTING OF PROTECTOR
Nylon cutting head Protector for cord cutter
Star Blade Eddy Blade Protector for metal
blades

13
Turn the machine upside down, and you can replace the cutter blade or the nylon
cutting head easily.
- Insert the hex wrench through the hole in the gear case and rotate the receiver
washer (3) until it is locked with the hex wrench.
- Loosen the nut (1) (left-hand thread) with the socket wrench and remove the nut
(1), and clamp washer (2).
With the hex wrench still in place.
- Mount the cutter blade onto the shaft so that the guide of the receiver washer (3)
fits in the arbor hole in the cutter blade. Install the clamp washer (2) and secure
the cutter blade with the nut (1).
[Tightening torque: 13 – 23 N·m]
NOTE: Always wear gloves when handling the cutter blade.
NOTE: The cutter blade-fastening nut (with spring washer) is a consumable part. If
there appears any wear or deformation on the spring washer, replace the
nut.
NOTE: The clamp washer (2), and nut (1) are not necessary for mounting the nylon
cutting head. The nylon head should go on top of the receiver washer (3).
- Screw the nylon cutting head onto the shaft.
- Make sure that the blade is the left way up.
MOUNTING OF CUTTER BLADE OR NYLON CUTTING HEAD
TightenLoosen
Hex wrench
Tighten
Loosen
Hex wrench
Rotation

14
Handling fuel
Utmost care is required when handling fuel. Fuel may contain substances similar to
solvents. Refuel either in a well ventilated room or outdoors. Do not inhale fuel
vapors, avoid any contact of fuel or oil with your skin.
Mineral oil products degrease your skin. If your skin comes in contact with these
substances repeatedly and for an extended period of time, it will desiccate.
Various skin diseases may result. In addition, allergic reactions may occur.
Eyes can be irritated by contact with oil. If oil comes into your eyes, immediately
wash them with clear water. If your eyes are still irritated, see a doctor immediately.
Fuel and oil mixture
The engine of the brush cutter is a high-efficiency two-stroke engine. It is run with a
mixture of fuel and two-stroke engine oil. The engine is designed for unleaded
regular fuel with a min. octane value of 91 RON. In case no such fuel is available,
you can use fuel with a higher octane value. This will not affect the engine, but may
cause poor operating behaviour.
A similar situation will arise from the use of leaded fuel. To obtain optimum engine
operation and to protect your health and the environment, only unleaded fuel should
be used!
For lubricating the engine use a two-stroke engine oil (quality grade: TC-3), which is
added to the fuel. The engine has been designed to use specified two-stroke engine
oil at mixture ratio of 50:1 to protect the environment. In addition, a long service life
and a reliable operation with a minimum emission of exhaust gases is guaranteed. It
is absolutely essential to observe a mixture ratio of 50:1 (specified 2-stroke engine
oil), as otherwise reliable function of the brush cutter cannot be guaranteed.
The correct mixture ratio:
Gasoline:Specified two-stroke engine oil = 50:1 or
Gasoline:Other manufacturer’s two-stroke engine oil = 25:1 recommended
Note: For preparing the fuel-oil mixture first mix the entire oil quantity with half
of the fuel required, then add the remaining fuel. Thoroughly shake the
mixture before filling it into the brush cutter tank. It is not wise to add
more engine oil than specified to ensure safe operation.
This will only result in a higher production of combustion residues
which will pollute the environment and clog the exhaust channel in the
cylinder as well as the muffler. In addition, the fuel consumption will rise
and the performance will decrease.
Refuelling
The engine must be switched off.
- Thoroughly clean the area around the fuel filler cap (2), to prevent dirt from getting
into the fuel tank (1).
- Unscrew the fuel filler cap (2) and fill the tank with fuel.
- Tightly screw on the fuel filler cap (2).
- Clean screw fuel filler cap (2) and tank after refueling.
Storage of Fuel
Fuel cannot be stored for an unlimited period of time.
Purchase only the quantity required for a 4 week operating period. Only use
approved fuel storage containers.
FUELS/REFUELLING
Observe the Safety Instructions on page 5.
Gasoline 50:1
1,000 cm3(1 liter)
5,000 cm3(5 liters)
10,000 cm3(10 liters)
+
25:1
20 cm3
100 cm3
200 cm3
40 cm3
200 cm3
400 cm3

15
Attachment of shoulder strap
- Adjust the strap length so that the cutter blade will be kept parallel with the ground.
Detachment
- In an emergency, push the notches (1) at both sides, and you can detach the
machine from you.
Be extremely careful to maintain control of the machine at this time. Do not allow
the machine to be deflected toward you or anyone in the work vicinity.
WARNING: Failure to maintain complete control of the machine at all could result in
serious bodily injury or DEATH.
- In an emergency, pull the emergency detachment lever (2) strongly.
You can detach the machine from you.
Be extremely careful to maintain control of the machine at this time. Do not allow
the machine to be deflected toward you or anyone in the work vicinity.
WARNING: Failure to maintain complete control of the machine at all could result in
serious bodily injury or DEATH.
Observe the applicable accident prevention regulations.
Starting
Move at least 3 m away from the place of refuelling. Place the brush cutter on a
clean piece of ground taking care that the cutting tool does not come into contact
with the ground or any other objects.
Cold start
For machine with U Handle or Loop Handle
- Push the I-O switch (1) in the direction shown by the arrow.
- First place the machine on the ground.
- Give a gentle push on the primer pump (2) repeatedly (7 – 10 times) until fuel
comes into the primer pump.
- Move the choke lever (3) to the position ( ).
CORRECT HANDLING OF MACHINE
(1)
RBC3110
Hanger
RBC3100/3101
Hanger
POINTS IN OPERATION AND HOW TO STOP

16
- Firmly hold the clutch case by your left hand, as illustrated.
- Slowly pull the starter grip until resistance is felt and continue with a smart pull.
- Do not pull out the starter rope to its full extent and do not allow the starter handle
to be retracted without control, but ensure that it is retracted slowly.
- Repeat the starting operation until initial ignitions are heard.
- When the engine start, return the choke lever to “ ”. Please note that the choke
lever will return to “ ” position automatically when the throttle lever is operated
and the throttle is opened.
- Run the engine for approximately one minute at a moderate speed before
applying full throttle.
Caution during operation:
If the throttle lever is opened fully in a no-load operation, the engine rotation is
increased to 10,000 min-1 or more. Never operate the engine at a higher speed than
required and at an approximate speed of 6,000 – 8,000 min-1.
Starting the warm engine
- Same as above, except without moving the choke lever (choke lever remains in
the position “ ”).
STOPPING
- Release the throttle lever (6) fully, and when the engine rpm has lowered, push
the I-O switch (1) to “ ” position the engine will now stop.
- Be aware that the cutting head may not stop immediately and allow it to slow down
fully.
ADJUSTMENT OF LOW-SPEED
ROTATION (IDLING)
The cutter blade or the nylon cutting head should not run when the control lever is
fully released. If necessary, adjust the idle rpm using the idle adjusting screw.
Checking the Idling speed
- Idle speed should be set to 2,600 min-1.
If necessary correct it by means of the idle screw (the blade or the nylon cutting
head must not turn when the engine is on idle).
Screwing in the screw (1) will cause an increase in the engine speed, whereas
backing off the screw will reduce the engine speed.
CAUTION: The cutting tools mentioned below must only be resharpened by an
authorized facility. Manual resharpening will result in imbalances of the
cutting tool causing vibrations and damage to the equipment.
- cutter blade (star blade (4 teeth), eddy blade (8 teeth))
An expert resharpening and balancing service is provided by Authorized Service
Agents.
NOTE: To increase the service life of the cutter blade (star blade, eddy blade) it may
be turned over once, until both cutting edges have become blunt.
Note: - If the starter handle is pulled repeatedly when the choke lever remains at
“ ” position, the engine will not start easily due to excessive fuel intake.
- In case of excessive fuel intake, remove the spark plug and pull the starter
handle slowly to remove excess fuel. Also, dry the electrode section of the
spark plug.
Slow High
RESHARPENING THE CUTTING TOOL

17
NYLON CUTTING HEAD
The nylon cutting head is a dual string trimmer head capable of both automatic and
bump & feed mechanisms.
The nylon cutting head will automatically feed out the proper length of nylon cord by
the changes in centrifugal force caused by increasing or decreasing rpms. However,
to cut soft grass more efficiently, bump the nylon cutting head against the ground to
feed out extra cord as indicated under operation section.
Operation
- Increase the nylon cutting head speed to approx. 6,000 min-1.
Low speed (under 4,800 min-1) is not suitable, the nylon cord will not feed out
properly at low speed.
- The most effective cutting area is shown by the shaded area.
If the nylon cord does not feed out automatically proceed as follows:
1. Release the throttle lever to run the engine idle and then squeeze the throttle
lever fully. Repeat this procedure until the nylon cord feeds out to the proper
length.
2. If the nylon cord is too short to feed out automatically with the above procedure,
bump the knob of the nylon cutting head against the ground to feed out the
nylon cord.
3. If the nylon cord does not feed out with procedure 2, rewind/replace the nylon
cord by following the procedures described under “Replacing the nylon cord”.
Replacing the nylon cord
- First, stop the engine.
- Press on the housing latches inward to lift off the cover, then remove the spool.
- Hook the center of new nylon cord into the notch in the center of the spool, with
one end of the cord extending about 80 mm (3 – 1/8”) more than the other. Then
wind both ends firmly around the spool in the direction of the head rotation (left-
hand direction indicated by LH and right-hand direction by RH on the side of the
spool).
- Wind all but about 100 mm (3 – 15/16”) of the cords, leaving the ends temporarily
hooked through a notch on the side of the spool.
- Mount the spool in the housing so that the grooves and protrusions on the spool
match up with those in the housing. Keep the side with letters on the spool visible
on the top. Now, unhook the ends of the cord from their temporary position and
feed the cords through the eyelets to come out of the housing.
Most effective cutting area
Idle speed Full speed
Knob
Press
Press
Latches
Cover
Spool 80 mm
(3 – 1/8”)
For left hand rotation
Spool
100 mm (3 – 15/16”)
Notches
Eyelets

18
- Align the protrusion on the underside of the cover with the slots of the eyelets.
Then push cover firmly onto the housing to secure it.
SERVICING INSTRUCTIONS
CAUTION: Before doing any work on the Brush cutter, always switch off the motor
and pull the plug cap off the spark plug (see “Checking the spark plug”).
Always wear protective gloves.
CAUTION: Never remove the recoil starter for yourself, which may cause an
accident.It should be asked to the Authorized Service Agent.
To ensure a long service life and to avoid any damage to the equipment, the
following servicing operations should be performed at regular intervals.
Daily checkup and maintenance
- Before operation, check the machine for loose screws or missing parts. Pay
particular attention to the tightness of the cutter blade or nylon cutting head.
- Before operation, always check for clogging of the cooling air passage and the
cylinder fins.
Clean them if necessary.
- Perform the following work daily after use:
• Clean the Brush cutter externally and inspect for damage.
• Clean the air filter. When working under extremely dusty conditions, clean the
filter the several times a day.
• Check the blade or the nylon cutting head for damage and make sure it is firmly
mounted.
• Check that there is sufficient difference between idling and engagement speed
to ensure that the cutting tool is at a standstill while the engine is idling (if
necessary, reduce idling speed).
If under idling conditions the tool should still continue to run, consult your
nearest Authorized Service Agent.
- Check the functioning of the I-O switch, the lock-off lever, the control lever, and
the look button.
Cleaning of air cleaner
- Push the choke lever (1) up (arrow), to prevent dirt particles from entering the
carburetor.
- Unscrew screw (2).
- Remove the air cleaner cover (4).
- Take out the sponge element (3), wash it in lukewarm water and dry it completely.
- After cleaning, put back the air cleaner cover (4) and fasten it with screw (2).
NOTE: If there is excessive dust or dirt adhering to the air cleaner, clean it every
day. A clogged air cleaner may make it difficult or impossible to start the
engine or increase the engine rotational speed.
Slot of eyelet
Protrusion
Cover
SERVICING INSTRUCTIONS

19
Checking the spark plug
- Only use the supplied universal wrench to remove or to install the spark plug.
- The gap between the two electrodes of the spark plug should be 0.6 – 0.7 mm
(0.024” – 0.028”). If the gap is too wide or too narrow, adjust it. If the spark plug is
clogged with carbon or fouled clean it. Thoroughly or replace it.
CAUTION: Never touch the spark plug connector while the engine is running
(danger of high voltage electric shock).
Supply of grease to gear case
- Supply grease (Shell Alvania 3 or equivalent) to the gear case through the grease
hole every 30 hours. (Genuine MAKITA grease may be purchased from your
MAKITA dealer.)
Suction head in the fuel tank
- The fuel filler (5) of the suction head is used to filler the fuel required by the
carburetor.
- A periodical visual inspection of the fuel filter is to be conducted. For that purpose
open the tank cap, use a wire hook and pull out the suction head through the tank
opening. Filters found to have hardened, been polluted or clogged up are to be
replaced.
- Insufficient fuel supply can result in the admissible maximum speed being
exceeded. It is therefore important to replace the fuel filter at least quarterly to
ensure satisfactory fuel supply to the carburetor.
Cleaning of muffler exhaust port
- Check of muffler exhaust port (6) regularly.
- If it is clogged by carbon deposits, carefully scratch the deposits out with a suitable
tool.
Any maintenance of adjustment work that is not included and described in this manual is only to be performed by Authorized Service Agents.
0.6 mm – 0.7 mm
(0.024” – 0.028”)
Gear case
Grease hole

20
- When the machine is in storage for a long time, drain fuel from the fuel tank and
carburetor, as follows: Drain all fuel from the fuel tank. Dispose of properly and in
accordance with all local laws.
- Remove the spark plug and a few drops of oil into the spark plug hole.
Then, pull the starter gently, so that oil covers the engine inside and tighten the
spark plug.
- Clear dirt or dust from the cutter blade and outside of engine, wipe them with a oil-
immersed cloth and keep the machine in a place as dry as possible.
Maintenance schedule
Fault location
STORAGE
Drain fuel Humidity
General Engine assembly, screws and nuts Visual inspection for damage and tightness
Check for general condition and security
After each refuelling Control lever Functional check
I-O switch Functional check
Daily Air filter To be cleaned
Cooling air duct To be cleaned
Cutting tool Check for damage and sharpness
Idling speed Inspection (cutting tool must not move)
Weekly Spark plug Inspection, replace if necessary
Muffler Check and if necessary clean the opening
Quarterly Suction head To be replaced
Fuel tank To be cleaned
Shuting down procedure Fuel tank Empty fuel tank
Carburetor Operate until engine runs out of fuel
Fault System Observation Cause
Engine not starting or
with difficulty Ignition system Ignition spark O.K. Fault in fuel supply or compression system, mechanical defect
No ignition spark I-O switch operated, wiring fault or short circuit, spark plug
or connector defective, ignition module faulty
Fuel supply Fuel tank filled Incorrect choke position, carburetor defective, fuel supply
line bent or blocked, fuel dirty
Compression No compression when
pulled over Cylinder bottom gasket defective, crankshaft seals damaged, cylinder or piston rings defective or improper
sealing of spark plug
Mechanical fault Starter not engaging Broken starter spring, broken parts inside of the engine
Warm start problems Tank filled ignition spark
existing Carburetor contaminated, must be cleaned
Engine starts but dies Fuel supply Tank filled Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted, cable
or I-O switch faulty
Insufficient performance Several systems may
simultaneously be
affected
Engine idling poor Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged