Makita EM2550UH User manual

Petrol Brush Cutter
Pemotong Semak Bermesin Bensin
My Ct c chy xăng
เครื่องตัดหญ้าแบบใช้น้ำมัน
EM2550UH INSTRUCTION MANUAL
PETUNJUK PENGGUNAAN
TI LIU HƯNG DN
คู่มือการใช้งาน
Important:
Read this instruction manual carefully before putting the Petrol Brush Cutter into operation and strictly observe
the safety regulations! Preserve instruction manual carefully!
Penting:
Bacalah petunjuk penggunaan ini dengan teliti sebelum mengoperasikan Pemotong Semak Bermesin Bensin
dan patuhilah dengan ketat peraturan keselamatan yang berlaku! Simpanlah buku petunjuk penggunaan ini
dengan baik!
Quan trng:
Đc ti liu hưng dn ny mt cch cn thn trưc khi vn hnh My Ct c chy xăng v tuân th nghiêm
chnh cc quy đnh v an ton! Gi ti liu hưng dn mt cch cn thn!
ข้อสำคัญ:
อ่านคู่มือการใช้งานนี้อย่างระมัดระวังก่อนใช้งานเครื่องตัดหญ้าแบบใช้น้ำมันและปฏิบัติตามกฎความปลอดภัยอย่างเคร่งครัด! เก็บคู่มือ
การใช้งานไว้ในที่ปลอดภัย!

2
Thank you very much for purchasing the MAKITA Petrol Brush Cutter.
We are pleased to recommend to you the MAKITA Petrol Brush Cutter 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 Petrol Brush Cutter.
Table of Contents Page
Symbols .........................................................................2
Safety instructions .........................................................3
Technical data................................................................7
Designation of parts.......................................................8
Mounting of handle ........................................................9
Mounting of protector...................................................10
Mounting of cutter blade ..............................................11
Before start of operation ..............................................12
Correct handling of machine........................................14
Points in operation and how to stop ............................14
Resharpening the cutting tool ......................................16
Servicing instructions...................................................17
Storage ........................................................................20
Take Particular care and Attention
Read instruction Manual
Forbidden
No Smoking
No open ame
Protective gloves must be worn
Keep the area of operation clear of all
persons and pets
Wear protective helmet, eye and ear
protection
Engine-Manual start
Top permissible tool speed
Emergency stop
ON/START
OFF/STOP
Flying object hazard
Keep distance
Kickback
Recycling
Fuel (Gasoline)
First Aid
You will note the following symbols when reading the instructions manual.
SYMBOLS
English

3
SAFETY INSTRUCTIONS
General Instructions
– To ensure correct operation, user has to read this instruction manual to make
himself familiar with the handling of the Petrol Brush Cutter.
Users insufciently informed will risk danger to themselves as well as others
due to improper handling.
– It is recommended only to lend the Petrol Brush Cutter to people who have
proven to be experienced with Petrol Brush Cutter.
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 Petrol Brush Cutter. Persons over the age of 16 years may
however use the device for the purpose of being trained only whilst under
supervision of a qualied trainer.
– Use Petrol Brush Cutter with the utmost care and attention.
– Operate the Petrol Brush Cutter 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 Petrol Brush Cutter after consumption of alcohol or drugs, or if
feeling tired or ill.
Intended use of the machine
– The Petrol Brush Cutter 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-
tting 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 Petrol Brush Cutter.
– 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
ying debris and stones. During operation of the Petrol Brush Cutter 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 ying 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 Petrol Brush Cutter.
– When using the Petrol Brush Cutter, always wear sturdy shoes (6) with a non-
slip sole. This protects against injuries and ensures a good footing.
Starting up the Petrol Brush Cutter
– Please make sure that there are no children or other people within a working
range of 15 meters (49ft), also pay attention to any animals in the working
vicinity.
– Before use always check that the Petrol Brush Cutter 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.
15 Meter
Diagrammatic gure
(1)
(2)
(3)
(4)
(5) (6)

4
Start the Petrol Brush Cutter only in accordance with the instructions.
– Do not use any other methods for starting the engine!
– Use the Petrol Brush Cutter and the tools only for such applications as
speci ed.
– Only start the Petrol Brush Cutter 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 Petrol Brush Cutter only with the shoulder strap attached which is
to be suitably adjusted before putting the Petrol Brush Cutter 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 Petrol Brush Cutter with both hands.
Always ensure a safe footing.
– Operate the Petrol Brush Cutter 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 Petrol Brush Cutter
unattended, and place it in a safe location to prevent danger to others or
damage to the machine.
– Never put the hot Petrol Brush Cutter 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 muf er.
– 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 Petrol Brush Cutter during car transportation to
avoid fuel leakage.
– When transporting the Petrol Brush Cutter, ensure that the fuel tank is
completely empty.
– When unloading the Petrol Brush Cutter 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 Petrol Brush Cutter to the
ground or this may severely damage the Petrol Brush Cutter.
– 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  re.
Refuelling
– Shut off the engine during refuelling, keep away from open  ames 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 Petrol Brush Cutter 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  re).
– 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.
3 meters
• Resting
• Transport
• Refuelling
• Maintenance
• Tool Replacement

5
Method of operation
– Only use the Petrol Brush Cutter 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 Petrol Brush Cutter.
– Never climb up into trees to perform cutting operation with the Petrol Brush
Cutter.
– 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 Petrol 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 Petrol Brush Cutter within a segment between 12 and 2 o’clock.
– Never apply this segment of the Petrol Brush Cutter blade to solids, such
as bushes and trees, etc., having a diameter in excess of 3 cm or the Petrol
Brush Cutter will be deected 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.
EM2550UH with cutter blade (Star Blade (4 teeth), Eddy Blade (8 teeth)).
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 Petrol 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
gure
Diagrammatic
gure

6
Never straighten or weld damaged cutting tools.
– Operate the Petrol Brush Cutter with as little noise and contamination as
possible. In particular check the correct setting of the carburetor.
– Clean the Petrol Brush Cutter at regular intervals and check that all screws
and nuts are well tightened.
– Never service or store the Petrol Brush Cutter in the vicinity of naked ames.
– Always store the Petrol Brush Cutter in locked rooms and with an emptied fuel
tank.
First Aid
In case of accident make sure that a rst-aid box is available in the vicinity of
the cutting operations. Immediately replace any item taken from the rst 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 Petrol Brush Cutter 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).
Observe the relevant accident prevention instructions issued by the relevant trade associations and by the insurance companies.
Do not perform any modications on the Petrol Brush Cutter 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 xing devices of cutting tools,
or accessories.

7
TECHNICAL DATA
Model
EM2550UH
U handle
Dimensions: length x width x height (without cutting blade) mm 1,770 x 595 x 370
Mass (without plastic guard and cutting blade) kg 5.2
Volume (fuel tank) L 0.5
Volume (oil tank) L 0.08
Engine displacement cm324.5
Maximum engine performance kw 0.66 at 7,000 min-1
Engine speed at recommended max. spindle speed min-1 8,500
Maximum spindle speed (corresponding) min-1 6,500
Maximum fuel consumption kg/h 0.33
Maximum specic fuel consumption g/kwh 408
Idling speed min-1 3,000
Clutch engagement speed min-1 3,750
Carburetor type WALBRO WYL
Ignition system type Solid state ignition
Spark plug type NGK CMR4A
Electrode gap mm 0.7 - 0.8
Fuel Automobile gasoline
Engine Oil SAE 10W-30 oil of API Ciassication,
Class SF or higher (4-stroke engine for automobile)
Gear ratio 14/19

8
DESIGNATION OF PARTS
GB DESIGNATION OF PARTS
1 Fuel Tank
2Rewind Starter
3Air Cleaner
4Stop Switch
5 Spark Plug
6Exhaust Mufer
7 Clutch Case
8Grip
9Hanger
10 Handle
11 Control Lever
12 Control Cable
13 Shaft
14 Protector
15 Gear Case/Head Case
16 Handle Holder
17 Cutter Blade
18 Fuel Filler Cap
19 Starter Knob
20 Exhaust Pipe
21 Oil Gauge
①
④
⑤
⑤
⑰
⑮
⑦
⑨
⑧
⑪
⑩
⑫
⑭
⑯
⑬
EM2550UH
Petrol Brush Cutter
①
③
⑥③
⑲
⑱
⑳
②
21

9
MOUNTING OF HANDLE
CAUTION: Before doing any work on the Petrol Brush Cutter, always stop the
engine and pull the spark plug connector off the spark plug.
Always wear protective gloves!
CAUTION: Start the Petrol Brush Cutter only after having assembled it
completely.
For machines with U Handle models
– Insert the handle bar into the handle holder, making sure that the boss in the
handle holder ts into the hole in the handle.
– After the handle bar is in place, tighten the four bolts (M5 x 25).
NOTE: Be sue the bolts are tight, but do not overtighten.
Installing the control cable
– Turn the control lever to the close position (1) fully. Fit the cable-end-barrel
and the inner cable (2) into the groove on the control lever.
– Insert the outer cable (3) into the hole (4).
– Fit the control cable (together with the earth cord) to the handle with two clips
(3).
– Avoid any tendency of the control cable to loop at the handle bar.
to engine
(3)
(1)
(2)
(3)
(4)

10
Always install the protector before operation. Otherwise contact with the blade
and thrown stone, etc. may cause serious injury.
Be sure to use genuine MAKITA cutter blades.
– 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.
CAUTION: The appropriate protector must always be installed, for your own
safety and in order to comply with accident-prevention regulations.
Operation of the equipment without the guard being in place is not
permitted.
– The outside diameter of the cutter blade must be 230 mm (9-1/16”). Never use
any blades surpassing 230 mm (9-1/16”) in outside diameter.
Use of protector for metal blade.
– Fasten the protector (1) to the clamp (3) with two bolts (2).
NOTE: Tighten the right and left bolts evenly so that the gap between the clamp
(3) and the protector (1) will be constant.
Otherwise, the protector sometimes may not function as specied.
(3)
(2)
(1)
MOUNTING OF PROTECTOR

11
Turn the machine upside down, and you can replace the cutter blade 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) ts 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.
– Make sure that the blade is the left way up.
MOUNTING OF CUTTER BLADE
Rotation
Hex wrench
(3)
(2) (1)

12
Inspection and Rell of Engine Oil
– Perform the following procedure, with the engine cooled down.
– While keeping the engine level, remove the oil gauge, and conrm that the oil is lled within the upper and lower limit marks.
When the oil is in short in such a way that the oil gauge touches the oil only by its tip, in particular with the oil gauge remaining inserted in the
crankcase without screwing-in (Fig. 1), rell new oil near the port (Fig. 2).
– For reference, the oil rell time is about 10h (10 times or 10 tanks of oil rell).
– If the oil changes in color or mixes with dirt, replace it with new one. (For the interval and method of replacement, refer to P 17)
Recommended oil: SAE 10W-30 oil of API Classication, Class SF or higher (4-stroke engine for automobile)
Oil volume: Approx. 0.08L
Point 1 in Replacement of Oil “Oil Gauge”
– Remove dust or dirt near the oil rell port, and detach the oil gauge.
– Keep the detached oil gauge free of sand or dust. Otherwise, any sand or dust adhering to the oil gauge may cause irregular oil
circulation or wear on the engine parts, which will result in troubles.
– As an example to keep the oil gauge clean, it is recommended to insert the oil gauge on its knob side into the engine cover, as shown
in Fig.3.
Oil gauge
If oil adheres around
this tip, rell new oil.
Fig.1
Upper limit
(Edge of oil rell port)
Fig.2
Fig.3
BEFORE START OF OPERATION
Note: If the engine is not kept upright, oil may go into around the engine, and may be relled excessively.
If the oil is lled above the limit, the oil may be contaminated or may catch re with white.

13
(1) Keep the engine level, and detach the oil gauge.
(2) Fill oil up to the edge of the oil rell port. (Refer to Fig.2 of the preceding
page).
Feed oil with the lubricant rell container.
(3) Securely tighten the oil gauge. Insufcient tightening may cause oil leakage.
Point 2 in Replacement of Oil: “If oil spills out”
– If oil spills out between the fuel tank and engine main unit, the oil is sucked into through the cooling air intake port, which will
contaminate the engine. Be sure to wipe out spilt oil before start of operation.
REFUELING
Handling of Fuel
It is necessary to handle fuel with utmost care. Fuel may contain substances similar to solvents. Refueling must be performed in a sufciently
ventilated room or in the open air. Never inhale fuel vapor, and keep fuel away from you. If you touch fuel repeatedly or for a long time, the skin
becomes dry, which may cause skin disease or allergy. If fuel enters into the eye, clean the eye with fresh water. If your eye remains still irritated,
consult your doctor.
Storage Period of Fuel
Fuel should be used up within a period of 4 weeks, even if it is kept in a special container in a well-ventilated shade.
If a special container is not used or if the container is not covered, fuel may deteriorate in one day.
Refueling
WARNING: INFLAMMABLES STRICTLY PROHIBITED
Gasoline used: Automobile gasoline (unleaded gasoline)
– Loosen the tank cap a little so that there will be no difference in atmospheric
pressure.
– Detach the tank cap, and refuel, discharging air by tilting the fuel tank so that
the refuel port will be oriented upward. (Never rell fuel full to the oil rell port.)
– Wipe well the periphery of the tank cap to prevent foreign matter from entering
into the fuel tank.
– After refueling, securely tighten the tank cap.
Points for Fuel
– Never use a gasoline mixture which contains engine oil. Otherwise, it will cause excessive carbon accumulation or mechanical troubles.
– Use of deteriorated oil will cause irregular startup.
Fuel
The engine is a four-stroke engine. Be sure to use an automobile gasoline (regular gasoline or premium gasoline).
STORAGE OF MACHINE AND REFILL TANK
– Keep the machine and tank at a cool place free from direct sunshine.
– Never keep the fuel in the cabin or trunk.
• If there is any aw or damage on the tank cap, replace it.
• The tank cap is consumable, and therefore should be renewed every two to
three years.
Fuel tank cap
Fuel upper limit
Fuel tank

14
CORRECT HANDLING OF MACHINE
Attachment of shoulder strap
– Make sure that the hook (1) is surely attached to the buckle (2). If the hook is
released, attach it as illustrated.
– Put the shoulder harness on your left shoulder by putting your head and right
arm through it. Make sure that the red tab (3) is on the outside.
– Hang the tool rmly on your right side.
– Adjust the strap so that the cutting blade is parallel with the ground at the level
of 10 cm above the ground.
Detachment
– In an emergency, pull the red tab (1) upward, 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 deected 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.
POINTS IN OPERATION AND HOW TO STOP
Observe the applicable accident prevention regulations!
STARTING
Move at least 3 m away from the place of refuelling. Place the Petrol 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.
A: Cold start
1) Set this machine on a at space.
Turn the control lever to the close position (1) fully. (1)
(3)
(2)
(1)
(1)

15
For machine with U Handle or Loop Handle
1) Set the I-O switch (1) to OPERATION.
2) Choke lever
Close the choke lever.
Choke opening:
– Full closing in cold or when the engine is cold.
– Full or half opening in restart just after stop of operation.
3) Primer pump
Continue to push the primer pump until fuel enters into the primer pump. (In
general, fuel enters into the primer pump by 7 to 10 pushes.)
If the primer pump is pushed excessively, an excess of gasoline returns to
the fuel tank.
4) Recoil starter
– Pull the start knob gently until it is hard to pull (compression point). Then,
return the start knob, and pull it strongly.
– Never pull the rope to the full. Once the start knob is pulled, never
release your hand immediately. Hold the start knob until it returns to its
original point.
5) Choke lever
When the engine starts, open the choke lever.
– Open the choke lever progressively while checking the engine operation.
Be sure to open the choke lever to the full in the end.
– In cold or when the engine is cooled down, never open the choke lever
suddenly. Otherwise, the engine may stop.
6) Warm-up operation
Continue warm-up operation for 2 to 3 minutes.
Note: – If the starter handle is pulled repeatedly when the choke lever remains at “START” 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.
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 - 8,500 min-1.
OPEN
CLOSE
Carburetor
Primer Pump

16
B: Startup after warm-up operation
1) Push the primer pump repeatedly.
2) Turn the control lever to the close position fully.
3) Pull the recoil starter strongly.
4) If it is difcult to start the engine, open the throttle by about 1/3.
Pay attention to the cutter blade which may rotate.
Attention in Operation
When the engine is operated upside down, white smoke may come out from the mufer.
STOPPING
1) Turn the control lever to the close position fully to reduce the engine speed.
2) Push the stop switch (1) until the engine stops completely.
3) Be aware that the cutting blade may not stop immediately. Allow the cutting
blade to slow down until it stops completely.
ADJUSTMENT OF LOW-SPEED ROTATION (IDLING)
When it is necessary to adjust the low-speed rotation (idling), perform it by the carburetor adjusting screw.
CHECKUP OF LOW-SPEED ROTATION
– Set the low-speed rotation to 3,000 min-1.
If it is necessary to change the rotation speed, regulate the adjusting screw
(illustrated on the left), with Phillips screwdriver.
– Turn the adjusting screw to the right, and the engine rotation will increase.
Turn the adjusting screw to the left, and the engine rotation will drop.
– The carburetor is generally adjusted before shipment. If it is necessary to
readjust it, please contact Authorized Service Agent.
RESHARPENING THE CUTTING TOOL
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.
(1)
Adjusting screw
Carburetor

17
REPLACEMENT OF ENGINE OIL
Deteriorated engine oil will shorten the life of the sliding and rotating parts to a great extent. Be sure to check the period and quantity of
replacement.
ATTENTION: In general, the engine main unit and engine oil still remain hot just after the engine is stopped. In replacement of oil,
conrm that the engine main unit and engine oil are sufciently cooled down. Otherwise, there may remain a risk of
scald.
Note: If the oil lled above the limit, it may be contaminated or may catch re with white smoke.
Interval of replacement: Initially, every 20 operating hours, and subsequently every 50 operating hours
Recommended oil: SAE10W-30 oil of API Classication SF Class or higher (4-stroke engine oil for automobile)
In replacement, perform the following procedure.
1) Conrm that the tank cap is tightened securely.
2) Detach the oil gauge.
Keep the oil gauge free from dust or dirt.
3) Place waste or paper near the oil rell port.
SERVICING INSTRUCTIONS
CAUTION : Before doing any work on the Petrol Brush Cutter, always stop the engine and pull the plug cap off the spark plug (see “checking the
spark plug”).
Always wear protective gloves!
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 ns.
Clean them if necessary.
– Perform the following work daily after use:
• Clean the Petrol Brush Cutter externally and inspect for damage.
• Clean the air lter. When working under extremely dusty conditions, clean the lter the severall times a day.
• Check the blade or the nylon cutting head for damage and make sure it is rmly mounted.
• Check that there is sufcient 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.
Fuel tank cap
Oil gauge
Waste or paper

18
5) Keep the engine level, and feed new oil up to the edge of the oil rell port.
In rell, use a lubricant rell container.
6) After rell, securely tighten the oil gauge. Insufcient tightening of the oil
gauge will lead to oil leakage.
POINTS ON OIL
– Never discard replaced engine oil in garbage, earth or sewage ditch. Disposal of oil is regulated by law. In disposal, always follow the
relevant laws and regulations. For any points remaining unknown, contact Authorized Service Agent.
– Oil will deteriorate even when it is kept unused. Perform inspection and replacement at regular intervals (replace with new oil every 6
months).
4) Detach the oil gauge, and drain oil, tilting the main unit toward the oil rell
port.
Drain oil in a container.
CLEANING OF AIR CLEANER
DANGER: INFLAMMABLES STRICTLY PROHIBITED
Interval of Cleaning and Inspection: Daily (every 10 operating hours)
– Turn the choke lever to the full close side, and keep the carburetor off from
dust or dirt.
Remove the air cleaner cover-xing bolts.
– Pull the cover lower side and detach the air cleaner cover.
– If oil adheres to the element (sponge), squeeze it rmly.
– For heavy contamination:
1) Remove the element (sponge), immerse it in warm water or in water-
diluted neutral detergent, and dry it completely.
2) Clean the element (felt) with gasoline, and dry it completely.
– Before attaching the element, be sure to dry it completely. Insufcient drying of
the element may lead to difcult startup.
– Wipe out with waste cloth, oil adhering around the air cleaner cover and plate
breather.
– Immediately after cleaning is nished, attach the cleaner cover and tighten it
with xing bolts. (In remounting, rst place the upper claw, and then the lower
claw.)
Points in Handling Air Cleaner Element
– Clean the element several times a day, if excessive dust adheres to it.
– If operation continues with the element remaining not cleared of oil, oil in
the air cleaner may fall outside, resulting in oil contamination Pick this part and remove the element (felt).
Plate
Element (sponge)
Air cleaner cover
Fixing bolt
Element (felt)
Breather Part

19
CLEANING OF FUEL FILTER
WARNING: INFLAMMABLES STRICTLY PROHIBITED
Interval of Cleaning and Inspection: Monthly (every 50 operating hours)
Suction head in the fuel tank
– The fuel ller (1) of the suction head is used to ller the fuel required by the
carburetor.
– A periodical visual inspection of the fuel lter 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.
– Insufcient fuel supply can result in the admissible maximum speed being
exceeded. It is therefore important to replace the fuel lter at least quarterly to
ensure satisfactory fuel supply to the carburetor.
REPLACEMENT OF FUEL PIPE
CAUTION: INFLAMMABLES STRICTLY PROHIBITED
Interval of Cleaning and Inspection: Daily (every 10 operating hours)
Replacement: Annually (every 200 operating hours)
Replace the fuel pipe every year, regardless of operating frequency. Fuel
leakage may lead to re.
If any leakage is detected during inspection, replace the fuel pipe immediately.
INSPECTION OF BOLTS, NUTS AND SCREWS
– Retighten loose bolts, nuts, etc.
– Check for fuel and oil leakage.
– Replace damaged parts with new ones for safety operation.
CLEANING OF PARTS
– Keep the engine always clean.
– Keep the cylinder ns free of dust or dirt. Dust or dirt adhering to the ns will
cause seizure.
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 0.7-0.8 mm
(0.028”-0.032”). If the gap is too wide or too narrow, adjust it. If the spark plug
is clogged with carton or fouled, clean it thoroubhly 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 2 or equivalent) to the gear case through the
grease hole every 30 hours. (Genuine MAKITA grease may be purchased from
your MAKITA dealer.)
REPLACEMENT OF GASKETS AND PACKINGS
In reassembling after the engine is dismounted, be sure to replace the gaskets and packings with new ones.
Any maintenance of adjustment work that is not included and described in this manual is only to be performed by Authorized Service Agents.
Fuel pipe
Fuel
lter (1)
Fuel pipe
0.7mm-0.8mm
(0.028”-0.032”)
Gear case
Grease hole
House clamp

20
STORAGE
Fault location
WARNING: When draining the fuel, be sure to stop the engine and conrm that the engine cools
down.
Just after stopping the engine, it may still hot with possibility of burns, inammability and re.
ATTENTION: When the machine is kept out of operation for a long time, drain up all fuel from the fuel
tank and carburetor, and keep it at a dry and clean place.
– Drain up fuel from the fuel tank and carburetor according to the following
procedure:
1) Remove the fuel tank cap, and drain fuel completely.
If there is any foreign matter remaining in the fuel tank, remove it
completely.
2) Pull out the fuel lter from the rell port using a wire.
3) Push the primer pump until fuel is drained from there, and drain fuel
coming into the fuel tank.
4) Reset the lter to the fuel tank, and securely tighten the fuel tank cap.
5) Then, continue to operate the engine until it stops.
– Remove the spark plug, and drip several drops of engine oil through the spark
plug hole.
– Gently pull the starter handle so that engine oil will spread over the engine,
and attach the spark plug.
– Attach the cover to the cutter blade.
– During storage, keep the rod horizontal or keep the machine upright with the
blade edge oriented upward. (In this case, pay full attention to prevent the
machine from falling.)
Never store the machine with the cutter blade edge oriented downward.
Lubricating oil may spill out.
– Keep the drained fuel in a special container in a well-ventilated shade.
Attention after long-time storage
– Before startup after long-time shutdown, be sure to replace oil (refer to P 17). Oil will deteriorate while the machine is kept out of operation.
Fault System Observation Cause
Engine not starting or with
difculty
Ignition system Ignition spark O.K. Fault in fuel supply or compression system, mechanical
defect
No ignition spark STOP-switch operated, wiring fault or short circuit, spark
plug or connector defective, ignition module faulty
Fuel supply Fuel tank lled 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 lled ignition spark
existing
Carburetor contaminated, have it cleaned
Engine starts but dies Fuel supply Tank lled Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted,
cable or STOP-switch faulty
Insufcient performance Several systems may
simultaneously be
affected
Engine idling poor Air lter contaminated, carburetor contaminated, mufer
clogged, exhaust duct in the cylinder clogged
Drain fuel Humidity