Page 1
OWNER’S MANUAL
848EG093A0 (406)
BRUSHCUTTERS
BK2650DL
G
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B
B
BK2650DL
GB-1
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BK2650DL
EXPLANATION OF SYMBOLS AND SAFETY WARNINGS
WARNING!!!
RISK OF DAMAGING HEARING
MAY INVOLVE A DAILY LEVEL OF PERSONAL EXPOSURE TO NOISE
MODEL
BK2650DL 25.4 cm398 dB(A) 111 dB(A) 112 dB(A) 1.0 m/s24.0 m/s
IN NORMAL CONDITIONS OF USE, THIS MACHINE
FOR THE OPERATOR EQUAL TO OR GREATER THAN
85 dB(A)
SOUND LEVEL VIBRATION LEVEL
EN27917
LpA
ISO 10884
measured
LwA
guaranteed
idling
ISO 7916
racing
2
GB-2
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BK2650DL
SAFETY FIRST
Instructions contained in warnings within this manual marked
with a symbol concern critical points which must be taken
into consideration to prevent possible serious bodily injury, and
for this reason you are requested to read all such instructions
carefully and follow them without fail.
WARNINGS IN THE MANUAL
WARNING
This mark indicates instructions, which must be followed in order to prevent accidents, which could lead to serious bodily injury or death.
IMPORTANT
This mark indicates instructions, which must be followed, or it
leads to mechanical failure, breakdown, or damage.
NOTE
This mark indicates hints or directions useful in the use of the
product.
Contents
1. Parts location .................................................. 3
2. Specifications ................................................. 4
3. Warning labels on the machine ...................... 4
4. Symbols on the machine ................................ 4
5. For safe operation........................................... 5
6. Set up ............................................................. 8
7. Fuel ................................................................. 9
8. Operation...................................................... 10
9. Maintenance ................................................. 13
10. Storage ......................................................... 15
11. Troubleshooting guide .................................. 16
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1. Parts location
(1) Carburetor
(2) Fuel tank
(3) Spark plug
(4) Choke lever
(5) Starter knob
(6) Muffler
(7) Fuel tank cap
(8) Debris guard
(9) Line head
(10) Gear case
(11) Drive shaft
(12) Loop handle
(13) Throttle lever
(14) Ignition switch
(15) Flexible shaft
(16) Throttle cable
(17) Frame
(18) Back cushion
GB-3
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BK2650DL
2. Specification
Model BK2650DL
Overall size (LxWxH) mm 2616 x 306 x 336
Dry weight kg 8.3
Engine Model Zenoah G26LS
Displacement cm
Fuel Mixture (Gasoline 50 : Oil 1)
Carburetor Diaphragm type
Ignition system Flywheel magneto (C.D.I.)
Spark plug NGK BPMR 7A
Fuel tank capacity L 1.1
Starter Recoil starter
Clutch Centrifugal type
Reduction ratio 1.67
Cutting head rotating direction Counter-clockwise (Operator view)
Specifications are subject to change without notice.
3
25.4
3. Warning labels on
the machine
Read owner’s manual before operating this machine.
Wear head, eye and ear protection.
Warning / Attention
Keep all children, bystanders and helpers 15
meters away from the machine.
4. Symbols on the machine
For safe operation and maintenance, symbols are carved
in relief on the machine. According to these indications,
please be careful not to make a mistake.
The port to refuel the “MIX GASOLINE”
Position: FUEL TANK CAP
The direction to close the choke
Position: ENGINE COVER
The direction to open the choke
Position: ENGINE COVER
If warning label peels off or becomes soiled and
impossible to read, you should contact the
dealer from which you purchased the product
to order new labels and affix them in the required
location(s).
Never modify your machine.
We won’t warrant the machine, if you use the
remodeled brushcutter or if you don’t observe
the proper usage written in the manual.
GB-4
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5. For safe operation
BK2650DL
1. Read this manual carefully until
you completely understand and
follow all safety and operating
instructions.
2. Keep this manual handy so that
you may refer to it later whenever any questions arise. Also
note, if you have any questions
which cannot be answered
herein, contact the dealer from
whom you purchased the product.
3. Always be sure to include this
manual when selling, lending, or
otherwise transferring the ownership of this product.
4. Never allow children or anyone
unable to fully understand the
directions given in the manual
to use the machine.
WORKING CONDITION
1. When using the product, you
should wear proper clothing and
protective equipment.
(1) Helmet
(2) Ear protectors
(3) Protection goggles or face
protector
(4) Thick work gloves
(5) Non-slip-sole work boots
2. And you should carry with you.
(1) Attached tools
(2) Properly reserved fuel
(3) Spare blade
(4) Things to notify your working
area (rope, warning signs)
(5) Whistle (for collaboration or
emergency)
(6) Hatchet or saw (for removal of
obstacles)
3. Do not wear loose clothing, jewelry, short tr ousers, sandals, or go
barefoot. Do not wear anything
which might be caught by a moving part of the unit. Secure hair
so it is above shoulder length.
WORKING CIRCUMSTANCE
1. Never star t the engine inside a
closed room or building. Exhaust
gases contain dangerous carbon
monoxide.
2. Never use the product,
a. when the ground is slippery
or when you can’t maintain a
steady posture.
b. At night, at times of heavy fog,
or at any other times when
your field of vision might be
limited and it would be difficult to gain a clear view of the
working area.
c. During rain storms, during
lightning storms, at times of
strong or gale-force winds, or
at any other times when
weather conditions might
make it unsafe to use the
product.
WORKING PLAN
1. You should never use the product when under the influence of
alcohol, when suffering from exhaustion or lack of sleep, when
suffering from drowsiness as a result of having taken cold medicine
or at any other time when a possibility exists that your judgment
might be impaired or that you
might not be able to operate the
product properly and in a safe
manner.
2. When planning your work schedule, allow plenty of time to rest.
Limit the amount of time over
which the product is to be used
continuously to somewhere
around 30-40 minutes per session, and take 10-20 minutes of
rest between work sessions. Also
try to keep the total amount of
work performed in a single day
under 2 hours or less.
WARNING
1. If you don’t observe the working
time, or working manner (See
“USING THE PRODUCT”), Repetitive Stress Injury (RSI) could
occur.
If you feel discomfort, redness and
swelling of your fingers or any
other part of your body, see a doctor before getting worse.
2. To avoid noise complaints, in general, operate product between
8 a.m. and 5 p.m. on weekdays
and 9 a.m. to 5 p.m. on weekends.
NOTE
Check and follow the local regulations as to sound level and hours of
operations for the product.
GB-5
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BK2650DL
5. For safe operation
BEFORE STARTING
THE ENGINE
1. The area within a perimeter of
15 m (50 ft) of the person using
the product should be considered
a hazardous area into which no
one should enter. If necessary,
yellow warning rope, warning
signs should be placed around
the perimeter of the area. When
work is to be performed simultaneously by two or more persons,
care should also be taken to constantly look around or otherwise
check for the presence and locations of other people working so
as to maintain a distance between
each person sufficient to ensure
safety.
2. Check the condition of working
area to avoid any accident by hitting hidden obstacles such as
stumps, stones, cans, or broken
glass.
IMPORTANT
ensure that neither the cutting
part nor the throttle come into
contact with any obstacle when
the engine starts.
WARNING
Never place the throttle into the
high-speed position when starting
the engine.
3. After star ting the engine, check
to make sure that the cutting attachment stops rotating when the
throttle is moved fully back to its
original position. If it continues to
rotate even after the throttle has
been moved fully back, turn off
the engine and take the unit to
your authorized KOMATSU
ZENOAH servicing dealer for repair.
USING THE PRODUCT
IMPORTANT
GB-6
Remove any obstacle before beginning work.
3. Inspect the entire unit for loose
fasteners and fuel leakage. Make
sure that the cutting attachment
is properly installed and securely
fastened.
4. Be sure the debris guard is firmly
attached in place.
5. Always use the shoulder strap.
Adjust the strap for comfort before starting the engine. The strap
should be adjusted so the left
hand can comfortably hold the
handlebar grip approximately
waist high.
STARTING THE ENGINE
1. Keep bystanders and animals at
least 15 m (50 ft) away from the
operating point. If you are approached, immediately stop the
engine.
2. The product is equipped with a
centrifugal clutch mechanism, so
the cutting attachment begins to
rotate as soon as the engine is
started by putting the throttle into
the start position. When starting
the engine, place the product
onto the ground in a flat clear area
and hold it firmly in place so as to
Cut only materials recommended by
the manufacturer. And use only for
tasks explained in the manual.
1. Grip the handles firmly with both
hands using your whole hand.
Place your feet slightly apart
(slightly further apart than the
width of your shoulders) so that
your weight is distributed evenly
across both legs, and always be
sure to maintain a steady, even
posture while working.
2. Keep cutting attachment below
waist level.
3. Maintain the speed of the engine
at the level required to perform
cutting work, and never raise the
speed of the engine above the
level necessary.
4. If the unit star ts to shake or vibrate, turn off the engine and
check the whole unit. Do not use
it until the trouble has been properly corrected.
5. Keep all parts of your body away
from rotating cutting attachment
and hot surfaces.
6. Never touch the muffler, spark
plug, or other metallic parts of the
engine while the engine is in operation or immediately after shutting down the engine. Doing so
Page 7
5. For safe operation
BK2650DL
could result in serious burns or electrical shock.
• IF SOMEONE COMES
1. Guard against hazardous situations at all times. Warn adults to
keep pets and children away from
the area. Be careful if you are approached. Injury may result from
flying debris.
2. If someone calls out or otherwise
interrupts you while working, always be sure to turn off the engine before turning around.
MAINTENANCE
1. In order to maintain your product
in proper working order, perform
the maintenance and checking
operations described in the
manual at regular intervals.
2. Always be sure to turn off the engine before performing any maintenance or checking procedures.
WARNING
The metallic parts reach high temperatures immediately after stopping the engine.
3. When replacing the cutting attachment or any other part, or
when replacing the oil or any lubricant, always be sure to use
only KOMA TSU ZENOAH products or products which have
been certified by KOMATSU
ZENOAH for use with the
KOMATSU ZENOAH product.
4. In the event that any part must be
replaced or any maintenance or
repair work not described in this
manual must be performed,
please contact a representative
from the store nearest KOMATSU
ZENOAH authorized servicing
dealer for assistance.
5. Do not use any accessor y or attachment other than those bearing the KOMA TSU ZENOAH mark
and recommended for the unit.
6. Under no circumstances should
you ever take apart the product
or alter it in any way. Doing so
might result in the product becoming damaged during operation or the product becoming unable to operate properly.
HANDLING FUEL
1. The engine of the KOMATSU
ZENOAH product is designed to
run on a mixed fuel, which contains highly flammable gasoline.
Never store cans of fuel or refill
the tank of the unit in any place
where there is a boiler, stove,
wood fire, electrical sparks, welding sparks, or any other source
of heat or fire which might ignite
the fuel.
2. Never smoke while operating the
unit or refilling its fuel tank.
3. When refilling the tank, always
turn off the engine and allow it to
cool down. Take a careful look
around to make sure that there ar e
no sparks or open flames anywhere nearby before refueling.
4. Wipe spilled fuel completely using a dry rag if any fuel spillage
occurs during refueling.
5. After refueling, screw the fuel cap
back tightly onto the fuel tank and
then carry the unit to a spot 3 m
or more away from where it was
refueled before turning on the engine.
TRANSPORTATION
1. When hand-carrying the product,
cover over the cutting part if necessary, lift up the product and
carry it paying attention to the
blade.
2. Never transport the product over
rough roads over long distances
by vehicle without removing all
fuel from the fuel tank. If doing so,
fuel might leak from the tank during transport.
GB-7
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BK2650DL
6. Set up
INSTALLING THE SHOULDER STRAP
1. Hook the upper part of the shoulder strap at the notch
on the top of the frame and pass it through the buckle
as shown in the Figure, then secure it firmly.
2. Put the hook at the lower part of the shoulder strap in
the strap installing location at the bottom of the frame.
Buckle
Frame
Hook
D-ring
INSTALLING HANDLE
• Mount the handle to the shaft tube and clamp it at a
location that the edge of CE label is matched with the
handle.
WARNING
• Stop tightening the screws when the gap A becomes zero.
CE label
INSTALLING CUTTING HEAD
1. While locking the gear shaft, by inserting the supplied
tool into the upper holder on the gearbox, loosen and
remove the hexagon nut (left-handed).
2. Then screw in the cutting head to the gear shaft over
the holders. Hand-tighten it securely.
DEBRIS GUARD SKIRT FOR LINE HEAD
• When using line head, make sure to attach the guard
skirt.
BALANCE UNIT
1. Put on strap and attach unit to strap.
2. Slide clamp up or down until unit balances with head
aparting from the ground when using it.
CONNECTING THE FLEXIBLE SHAFT AND BK2650DL
1. Remove the retaining bolt (M5 x 10) at the center of
the joint end and loosen the fixing bolt (M5 x 20).
Loosen also the fixing screws (M5 x L20) at two locations that fix the throttle lever assembly. Be careful
not to drop the nuts.
2. Insert the throttle lever assembly in the main pipe.
3. Push the main pipe in the joint while rotating it gently
to the right and left.
4. Align the retaining screw hole for the joint with the
main pipe hole, screw in the retaining bolt and secure it firmly.
5. Tighten the joint fixing bolt to fix the main pipe securely.
[Tightening torque] 4.9 to 7.8 N-m (0.5 to 0.8 kg-m)
6. Slide the throttle lever assembly toward the joint, screw
in the fixing screw and secure it firmly.
(1) Retaining hole
(2) Main pipe
(3) Cramp screw
(4) Joint
(5) Retaining bolt
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7. Fuel
BK2650DL
■ FUEL
WARNING
• Gasoline is very flammable. Avoid smoking or
bringing any flame or sparks near fuel. Make sure
to stop the engine and allow it cool before refueling the unit. Select outdoor bare ground for fueling and move at least 3 m (10 ft) away from the
fueling point before starting the engine.
• The Komatsu Zenoah engines are lubricated by oil
specially formulated for air-cooled 2-cycle gasoline
engine use. If Komatsu Zenoah oil is not available,
use an anti-oxidant added quality oil expressly labeled
for air-cooled 2-cycle engine use (JASO FC GRADE
OIL or ISO EGC GRADE).
• Do not use BIA or TCW (2-stroke water-cooling type)
mixed oil.
■ RECOMMENDED MIXING RATIO
GASOLINE 50 : OIL 1
• Exhaust emission are controlled by the funda-
mental engine parameters and components (eq.,
carburation, ignition timing and port timing) without addition of any major hardware or the introduction of an inert material during combustion.
• These engines are certified to operate on unleaded
gasoline.
• Make sure to use gasoline with a minimum octane
number of 89RON (USA/Canada: 87AL).
• If you use a gasoline of a lower octane value than
prescribed, there is a danger that the engine temperature may rise and an engine problem such as
piston seizing may consequently occur.
• Unleaded gasoline is recommended to reduce the
contamination of the air for the sake of your health
and the environment.
• Poor quality gasolines or oils may damage sealing
rings, fuel lines or fuel tank of the engine.
least one minute. As some oils may be difficult to
agitate depending on oil ingredients, sufficient agitation is necessary for the engine to last long. Be
careful that, if the agitation is insufficient, there is an
increased danger of early piston seizing due to abnormally lean mixture.
5. Put a clear indication on the outside of the container
to avoid mixing up with gasoline or other containers.
6. Indicate the contents on outside of container for easy
identification.
■ FUELING THE UNIT
1. Untwist and remove the fuel cap. Rest the cap on a
dustless place.
2. Put fuel into the fuel tank to 80% of the full capacity.
3. Fasten the fuel cap securely and wipe up any fuel
spillage around the unit.
WARNING
1. Select bare ground for fueling.
2. Move at least 10 feet (3 meters) away from the fueling point before starting the engine.
3. Stop the engine before refueling the unit. At that time,
be sure to sufficiently agitate the mixed gasoline in
the container.
■ FOR YOUR ENGINE LIFE, AVOID:
1. FUEL WITH NO OIL (RAW GASOLINE) – It will cause
severe damage to the internal engine parts very
quickly.
2.
GASOHOL – It can cause deterioration of rubber and/
or plastic parts and disruption of engine lubrication.
3. OIL FOR 4-CYCLE ENGINE USE – It can cause
spark plug fouling, exhaust port blocking, or piston
ring sticking.
4. Mixed fuels which have been left unused for a
period of one month or more may clog the carburetor and result in the engine failing to operate properly.
5. In the case of storing the product for a long period
of time, clean the fuel tank after rendering it empty.
Next, activate the engine and empty the carburetor
of the composite fuel.
6. In the case of scrapping the used mixed oil container, scrap it only at an authorized repository site.
Note: As for details of quality assurance, read the description in
the section Limited Warranty carefully . Moreover, normal wear and
change in product with no functional influence are not covered by
the warranty. Also, be careful that, if the usage in the instruction
manual is not observed as to the mixed gasoline, etc. described
therein, it may not be covered by the warranty.
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■ HOW TO MIX FUEL
• Pay attention to agitation.
1. Measure out the quantities of gasoline and oil to be
mixed.
2. Put some of the gasoline into a clean, approved fuel
container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of gasoline and agitate again for at
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BK2650DL
8. Operation
STARTING A COOLED ENGINE
1. Set the ignition switch to the RUN position.
2. Release the throttle lever. This lever cannot be oper-
ated unless you hold the grip firmly and push the upper lever as far as it goes.
(3) (2)
(1) Ignition switch
(2) STOP
(3) RUN
(4) Throttle lever
(5) Idling
(6) Fully opened
(1)
(4)
(6)
(5)
3. Fill the carburetor with fuel by using the carburetor
starting pump. Repeatedly push and release the pump
with the fingers until excess fuel flows out in the clear
tube.
NOTE
• The pumping operation is not required when restart-
ing the engine immediately after stopping it while fuel
remains in the tank.
4. Close the choke lever at the bottom of the air cleaner.
NOTE
• Pull the starter rope while leaving the choke open if
you restart the engine immediately after the engine
stops.
6. When the engine starts, open the choke gradually.
7. Allow the engine to warm up at low speed for two to
three minutes before starting operation.
IMPORTANT
• Overchoking may make the engine hard to start due
to excess fuel. If the engine fails to start after several
attempts, open the choke and repeatedly pull the rope,
or remove the spark plug and dry it before trying again.
STARTING A WARMED ENGINE
You can start a warmed engine while carr ying the unit
on the back.
1. Set the ignition switch to the RUN position.
2. Release the throttle lever.
3. Set the choke lever to the Open position.
4. Hold the handle fir mly with the right hand and keep
the cutter head away from surroundings such as the
ground.
5. Pull the starter grip with the left hand.
Primer pump
Open
Choke lever
Close
5. Place the unit on flat, firm ground. Make sure that the
cutting head is clear of everything around it, then pull
the starter knob while grasping the main pipe with
the left hand and weighing down the frame with the
right foot.
IMPORTANT
• Do not pull all the rope at a time or return it by releasing the knob. Doing so may cause a starter failure.
GB-10
Starter grip
Page 11
8. Operation
(1)
(2)
BK2650DL
NOTE
• This brush cutter can be operated in either the right
side or left side position. The rope guide position is
fixed for right side position operation when shipped
from the factory.
• Adjust the rope guide position as shown in the figure
to allow the operator in the left-hand position to pull
the recoil starter with the right hand.
• When changing the position from right to left side, or
from left to right side position, be sure to stop the engine and place the frame on the ground. Change the
orientation of the shaft and carry the frame on the back
again.
• Do not change the orientation of the shaft while carrying the unit on the back.
Otherwise, accidental injury may occur.
Rope guide
Right side
STOPPING ENGINE
1. Release the throttle lever and run the engine for half
a minute.
2. Shift the ignition switch to the STOP position.
IMPORTANT
• Except for an emergency, avoid stopping the engine
while pulling the throttle lever.
ADJUSTING THROTTLE CABLE
• The normal play is 1 or 2 mm when measured at the
carburetor side end. Readjust with the cable adjuster
as required.
(1) Cable adjuster
(2) 0.04in (1-2mm)
ADJUSTING IDLING SPEED
1. When the engine tends to stop frequently at idling
mode, turn the adjusting screw clockwise.
2. When the cutting head keeps rotating after releasing
the trigger , turn the adjusting screw counter -clockwise.
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Left side
Rope guide
WARNING
• The product is equipped with a centrifugal clutch
mechanism, so the cutting attachment begins to
rotate as soon as the engine is started by putting
the throttle into the start position. When starting
the engine, place the product onto the ground in a
flat clear area and hold it firmly in place so as to
ensure that neither the cutting part nor the throttle
come into contact with any obstacle when the engine starts.
(1)
(1) Idle adjusting screw
(cross screw)
NOTE
•Warm up the engine before adjusting the idling speed.
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Page 12
BK2650DL
8. Operation
PUTTING ON THE UNIT
WARNING
NOTE
• When carrying the unit on the back, make sure that
the throttle lever is set to the idling position and that
the throttle wire will not become twisted and tensioned.
1. After confir ming that there is no person or obstacle
nearby , grasp the end of the main pipe handle (cutter
head side) with the left hand and put the right shoulder strap around the right shoulder.
2. Hold the main pipe with the right hand and put the left
shoulder strap around the left shoulder.
3. Join the right and left shoulder straps in front of the
chest.
4.
Adjust the length of the right and the left shoulder straps
to fit the body of the operator so that the back cushion
is slightly above waist level and the weight of the unit
is equally carried by the right and left shoulders.
How to adjust the length of the shoulder strap
<Shortening the strap>
Pull down the end of the strap.
<Lengthening the strap>
Pull up the bottom end of
the buckle.
• Make sure to use shoulder strap and debris guard.
If not, it is very dangerous when you slip or lose
your balance.
CUTTING WORK
WARNING
1. Always wear eye protection such as safety
goggles. Never lean over the rotating cutting head.
Rocks or other debris could be thrown into eyes
and face and cause serious personal injury.
2. Keep the debris guard in place at all times when
the unit is operated.
TRIMMING GRASS AND WEEDS
• Always remember that the TIP of the line does cutting. You will achieve better results by not crowding
the line into the cutting area. Allow the unit to trim at
its own pace.
1. Hold the unit so the head is off the ground and is tilted
about 20 degrees toward the sweep direction.
HOW TO OPERA TE THE EMERGENCY RELEASE PINCH
In case of emergency, pinch the depressed portions (1
and 2) on the hook of the shoulder strap. The shoulder
strap will then be released from the shoulder and the
brush cutter will be separated from the body.
2. You can avoid thrown debris by sweeping from your
3. Use a slow, deliberate action to cut heavy growth.
4. Never swing the unit so hard as you are in danger of
• By using the shoulder strap, hang the unit on your
right side. Adjust the strap length so that the cutting
head may become parallel to the ground.
GB-12
5. Try to control the cutting motion with the hip rather
6. Take precautions to avoid wire, grass and dead, dry,
left to the right.
The rate of cutting motion will depend on the material
being cut. Heavy growth will require slower action than
will light growth.
losing your balance or control of the unit.
than placing the full workload on the arm and hands.
long-stem weeds from wrapping around the head
shaft. Such materials can stall the head and cause
the clutch to slip, resulting in damage to the clutch
system if repeated frequently.
Page 13
8. Operation
BK2650DL
ADJUSTING THE LINE LENGTH
•Your brush cutter is equipped with a semi- auto type
nylon line head that allows the operator to advance
the line without stopping the engine. When the line
becomes short, lightly tap the head on the ground
while running the engine at full throttle.
• Each time the head is bumped, the line advances
about 25 mm. For better effect, tap the head on bear
ground or hard soil. Avoid bumping in thick, tall grass
as the engine may stall by overload.
9. Maintenance
Every Every Every
System/components Procedure
fuel leaks, fuel spillage wipe out ✔
fuel tank, air filter, fuel filter inspect/clean ✔✔ replace, if necessary
idle adjusting screw ✔
spark plug ✔
ENGINE
cylinder fins, intake air cooling vent
muffler, spark arrester, cylinder exhaust port
throttle lever, ignition switch check operation ✔
cutting parts ✔
gear case grease ✔
screws/nuts/bolts tighten/replace ✔✔not adjusting screws
SHAFT
debris guard make sure to attach ✔
flexible shaft grease, seal ✔
see adjusting replace carburetor
idling speed if necessary
clean and readjust GAP: .025 in (0.6-0.7 mm)
plug gap replace, if necessary
clean ✔
clean ✔
replace if
something’s wrong
Before
25 50 100
hours hours hours
use
after after after
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Note
REFILLING TRIMMING LINE
1. For replacement line, use a diameter of 2.4mm(.095in).
The spool is capable for a line upto 6m(20ft) on the
10cm(4”) head. Avoid using a larger line as it may cut
down the trimming performance.
WARNING
• For safety reasons, do not use metalreinforced
line.
2. Pinch the slotted area on the both sides of the spool
housing to unhook the bottom cap.
3. Take out the spool and pull off the old line. Put one
end of new line through the spool holes and pull it
until the length is equal between each part of the line.
4. Wind up the line in the correct direction as indicated
on the spool.
5. Hook each end of the line in the slot on the edge of
the spool, and then put the ends through the eyelets
on the housing. Make sure that the spring and the
washers are in place.
6. While holding the spool against the housing, pull the
line ends to release them from the slot.
7. Line up the slot on the bottom cap with the hook on
the housing, press the cap against the housing until it
clicks.
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BK2650DL
9. Maintenance9. Maintenance
WARNING
• Make sure that the engine has stopped and is cool
before performing any service to the machine.
Contact with moving cutting head or hot muffler
may result in a personal injury.
AIR FILTER
• The air filter, if clogged, will r educe the engine performance. Check and clean the filter element in warm,
soapy water as required. Dry completely before installing. If the element is broken or shrunk, replace
with a new one.
(1) Air filter
FUEL FILTER
• When the engine runs short of fuel supply, check the
fuel cap and the fuel filter for blockage.
MUFFLER
WARNING
• Inspect periodically, the muffler for loose fasteners, any damage or corrosion. If any sign of exhaust leakage is found, stop using the machine
and have it repaired immediately.
• Note that failing to do so may result in the engine
catching on fire.
GEAR CASE
• The reduction gears are lubricated by multipurpose,
lithium-based grease in the gear case. Supply new
grease every 25 hours of use or more often depending on the job condition.
•(For the engine)
Remove the bolt of the grease nipple and the bolt
opposite side of the grease nipple. Install new grease
into the grease nipple to arrange for old grease to
exit from the opposite side.
• (For the cutting head)
Remove the cutter holders before installing new
grease to arrange for old grease to exit.
(1) Fuel filter
SPARK PLUG
• Starting failure and misfiring are often caused by a
fouled spark plug. Clean the spark plug and check
that the plug gap is in the correct range. For a replacement plug, use the correct type specified by
KOMATSU ZENOAH.
0.6-0.7 mm
• REPLACEMENT PLUG IS A NGK BPMR7A.
IMPORTANT
• Note that using any spark plug other than those designated may result in the engine failing to operate properly or in the engine becoming overheated and damaged.
• To install the spark plug, first turn the plug until it is
finger tight, then tighten it a quarter turn more with a
socket wrench.
FLEXIBLE SHAFT
1. Pull out the flexible liner while pulling the stopper upward.
(1) Stopper
(2) Flexible liner
(3) Gear case
2. Pull out the inner shaft from the clutch housing side
hole, apply Zenoah Guine Power Grease (Z3180-
91250) or lithium-based heat-resistant grease (#2) to
the shaft, and insert the shaft back into the liner.
(4) Inner shaft
GB-14
TIGHTENING TORQUE:
15-220 kgf-cm
(15.3-22.4 N.m.)
Page 15
BK2650DL
9. Maintenance
INTAKE AIR COOLING VENT
WARNING
• Never touch the cylinder, muffler, or spark plugs
with your bare hands immediately after stopping
the engine. The engine can become very hot when
in operation, and doing so could result in severe
burns.
• When checking the machine to make sure that it
is okay before using it, check the area around the
muffler and remove any wood chips or leaves
which have attached themselves to the
brushcutter. Failing to do so could cause the muffler to become overheated and that in turn could
cause the engine to catch on fire. Always make
sure that the muffler is clean and free of wood
chips, leaves, and other waste before use.
• Check the intake air cooling vent and the area
around the cylinder cooling fins after every 25
hours of use for blockage, and remove any waste
which has attached itself to the brushcutter. Note
that it is necessary to remove the upper cover and
the lower cover shown in in order to be able to
view the upper part of the cylinder.
10. Storage
Aged fuel is one of major causes of engine starting failure. Before storing the unit, empty the fuel tank and run
the engine until it uses all the fuel left in the fuel line and
the carburetor. Store the unit indoor taking necessary
measures for rust prevention.
G
B
IMPORTANT
• If waste gets stuck and causes blockage around the
intake air cooling vent or between the cylinder fins, it
may cause the engine to overheat, and that in turn
may cause mechanical failure on the part of the
brushcutter.
Intake air
cooling vent
PROCEDURES TO BE PERFORMED AFTER
EVERY 100 HOURS OF USE
1. Remove the muffler, insert a screwdriver into the vent,
and wipe away any carbon buildup. Wipe away any
carbon buildup on the muffler exhaust vent and cylinder exhaust port at the same time.
2. Tighten all screws, bolts, and fittings.
3. Check to see if any oil or grease has worked its way
in between the clutch lining and drum, and if it has,
wipe it away using oil-free, lead-free gasoline.
GB-15
Page 16
BK2650DL
11. Troubleshooting guide
Case 1. Starting failure
CHECK PROBABLE CAUSES ACTION
fuel tank → incorrect fuel → drain it and use correct fuel
fuel filter → fuel filter is clogged → clean
carburetor adjustment screw → out of normal range → adjust to normal range
sparking (no spark) → spark plug is fouled/wet → clean/dry
→ plug gap is incorrect → correct (GAP: 0.6-0.7 mm)
spark plug → disconnected → retighten
Case 2. Engine starts but does not keep running/hard re-starting
CHECK PROBABLE CAUSES ACTION
fuel tank → incorrect fuel or staled fuel → drain it and use correct fuel
carburetor adjustment screw → out of normal range → adjust to normal range
muffler, cylinder (exhaust port) → carbon is built-up → wipe away
air cleaner → clogged with dust → wash
cylinder fin, fan cover → clogged with dust → clean
When your unit seems to need further service, please consult with our KOMATSU ZENOAH® service shop in your area.
Limited warranty
Should any failure occur on the product under normal operating conditions within the applicable warranty period, the
failed part will be replaced or repaired free of charge by a
KOMATSU ZENOAH® authorized dealer.
WARRANTY PERIOD: 1 year (6 months if used professionally , and 30 days if used for r ental purpose) from the date of
initial purchase.
THE PURCHASER SHALL BEAR COSTS OF TRANSPORTING THE UNIT TO AND FROM THE KOMATSU
ZENOAH DEALER.
THE PURCHASER SHALL NOT BE CHARGED FOR DIAGNOSTIC LABOR WHICH LEADS TO THE DETERMINA TION
THAT A WARRANTED PART IS DEFECTIVE, IF THE DIAGNOSTIC WORK IS PERFORMED AT THE KOMATSU
ZENOAH DEALER.
THE PURCHASER OR OWNER IS RESPONSIBLE FOR THE
PERFORMANCE OF THE REQUIRED MAINTENANCE AS
DEFINED BY THE MANUFACTURER IN THE OWNER/OPERATOR MANUAL.
ANY WARRANTED P AR T WHICH IS NOT SCHEDULED FOR
REPLACEMENT AS REQUIRED MAINTENANCE, OR
WHICH IS SCHEDULED ONL Y FOR REGULAR INSPECTION
TO THE EFFECT OF REPAIR OR “REPLACE AS NECESSARY” SHALL BE WARRANTED FOR THE WARRANTY PERIOD. ANY WARRANTED PART WHICH IS SCHEDULED
FOR REPLACEMENT AS REQUIRED MAINTENANCE
SHALL BE WARRANTED FOR THE PERIOD OF TIME UP
TO THE FIRST SCHEDULED REPLACEMNET POINT FOR
THE PART.
ANY REPLACEMENT PART THAT IS EQUIVALENT IN PERFORMANCE AND DULABILITY MAY BE USED IN NON-
WARRANTY MAINTENANCE OR REPAIRS, AND SHALL
NOT REDUCE THE WARRANTY OBLIGATION OF THE
COMPANY.
THE COMPANY IS LIABLE FOR DAMAGES TO OTHER
ENGINE COMPONENTS CAUSED BY THE FAIRURE OF A
WARRANTED PARTS STILL UNDER WARRANTY.
THE WARRANTY DOES NOT APPLY TO THOSE UNITS
WHICH HAVE BEEN DAMAGED BY NEGLIGENCE OF INSTRUCTION LISTED IN THE OWNER/OPERA TOR MANUAL
FOR PROPER USE AND MAINTENANCE OF THE UNITS
ACCIDENT MISHANDLING, ALTERATION, ABUSE, IMPROPER LUBULICA TION, USE OF ANY PARTS OR ACCESSARIES OTHER THAN THOSE SPECIFIED BY THE COMPANY, OR OTHER CAUSES BEYOND THE CONPANY’S
CONTROL.
THIS WARRANTY DOES NOT COVER THOSE PARTS REPLACED BY NORMAL WEAR OR HARMLESS CHANGES
IN THEIR APPEARANCE.
THERE ARE NO OTHER EXPRESS WARRANTIES.
IMPLIED WARRANTIES INCLUDING THOSE OF MER-
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO TWO (2) YEARS OF HOME USE
[ONE (1) YEAR FOR ANY OTHER USE] FROM THE ORIGINAL DELIVERY DATE.
LIABILITIES FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGE UNDER ANY AND ALL WARRANTIES ARE
EXCLUDED.
IF YOU NEED TO OBTAIN MORE INFORMATION, PLEASE
CALL YOUR NEAREST SERVICE CENTER,
OR CHECK PLEASE KOMATSU ZENOAH WEB SITE
http://www.zenoah.net
GB-16
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