Zenoah BKZ305L-EZ User manual

BKZ305L-EZ
OWNER’S MANUAL
BRUSHCUTTER
115 67 14-79 (401)
• Before using our products,
please read this manual
carefully to understand the
proper use of your unit.
• Keep this manual handy.
G
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1. Parts location
Contents
1. Parts location ...................................................2
2. Specification ....................................................3
3. Symbols on the machine..................................3
4. Warning labels on the machine .......................4
5. For safe operation ............................................5
6. Set up...............................................................9
7. Fuel ................................................................13
8. Operation .......................................................14
9. Maintenance ..................................................19
10. Storage...........................................................22
11. Troubleshooting..............................................23
12. Disposal .........................................................23
7.
9.
11.
12.
13.
14.
15.
16.
17. 21.
20.
19.
18.
4.
1.
5.
6.
2.
3. 8.
10.
(1) Carburetor
(2) Air cleaner
(3) Fuel tank
(4) Spark plug
(5) Choke lever
(6) Starter knob
(7) Muffler
(8) Fuel tank cap
(9) Debris guard
(10) Blade
(11) Gear case
(12) Drive shaft
(13) Loop handle
(14) Throttle lever
(15) Engine stopping switch
(16) Flexible shaft
(17) Throttle cable
(18) Frame
(19) Back cushion
(20) Hanging belt
(21) Wire clamp
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 care-
fully and follow them without fail.
NOTES ON TYPES OF 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.
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2. Specification
3. Symbols on the machine
The port to refuel the “MIX GASOLINE”
Position: FUEL TANK CAP
The direction to close the choke
Position: AIR CLEANER COVER
The direction to open the choke
Position: AIR CLEANER COVER
Model BKZ305L-EZ
Handle Type Loop
Dry Weight (*1) kg 8.2
Over all size (L x W x H) mm 315 x 306 x 336
Total length of the control stick/ mm
external shape of the main pipe 2317-ø24
Fuel Tank Capacity ℓ1.1
Standard blade 10-inch, Chip saw
Power Transmission Method Automatic centrifugal clutch, spiral gear
Reduction Rate 1.67
Blade Rotating Direction Counterclockwise (from operator’s view)
Engine
Displacement cc 29.5
Fuel Used Lubricating oil mixed gasoline
Lubricating Oil Used 2-stroke engine oil
Mixing rate
GASOLINE 40 : OIL 1
When using market oil (JASO FC grade oil or ISO-L-EGC grade oil)
GASOLINE 50 : OIL 1
When using ZENOAH genuine oil, JASO FD grade oil or ISO-L-EGD
grade oil
Carburetor Float-type piston valve
Sparking Method Fly wheel magnet (CDI)
Spark Plug NGK CMR7H-10
Starting Method Pressure-accumulator type recoil starter (EZ start)
(*1) Excluding blade and fuel
Note that detailed specifications of the product might differ from the information described herein due to modifications, etc.
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.
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4. Warning labels on the machine
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.
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 re-
quired location(s).
Warning / Attention
Location
①
(1) Read owner’s manual before operating this machine.
(2) Wear head, eye and ear protection.
(3) Wear foot protection.
(4) Wear gloves.
(5) Beware of thrown objects.
(6) Warning / Attention
(7) Keep all children, bystanders and helpers 15 meters away from the brushcutter.
(1) (2) (3) (4) (5) (6) (7)
③
The engine may start in retard
of pulling the recoil starter.
Hold the machine firmly till the
engine start.
②
Keep the cutting
blade around clear or
person or object when
start the engine.
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1. Read this manual carefully
until you completely under-
stand 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 pur-
chased 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 any-
one 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, jew-
elry, short trousers, sandals, or
go barefoot. Do not wear any-
thing which might be caught by
a moving part of the unit. Secure
hair so it is above shoulder
length.
■
WORKING CIRCUMSTANCE
1. Never start the engine inside a
closed room or building. Exhaust
gases contain dangerous carbon
monoxide.
2. Never use the product,
(1) When the ground is slippery or
when you can’t maintain a
steady posture.
(2) 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.
(3) During rain storms, during light-
ning storms, at times of strong
or gale-force winds, or at any
other times when weather condi-
tions might make it unsafe to use
the product.
■WORKING PLAN
1. You should never use the product
when under the influence of al-
cohol, when suffering from ex-
haustion or lack of sleep, when
suffering from drowsiness as a
result of having taken cold med-
icine or at any other time when a
possibility exists that your judg-
ment 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 sched-
ule, 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 ses-
sion, 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”), Re-
petitive 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 be-
tween 8 a.m. and 5 p.m. on
weekdays and 9 a.m. to 5 p.m.
on weekends.
5. For safe operation
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the cutting attachment begins to
rotate as soon as the engine is
started by putting the throttle
lever 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
lever come into contact with any
obstacle when the engine
starts.
WARNING
Never place the throttle lever into
the high-speed position when
starting the engine.
3. After starting the engine, check
to make sure that the cutting at-
tachment stops rotating when the
throttle is moved fully back to its
original position. If it continues to
rotate even after the throttle lever
has been moved fully back, turn
off the engine and take the unit
to your authorized ZENOAH
servicing dealer for repair.
■USING THE PRODUCT
IMPORTANT
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 starts to shake or vi-
brate, turn off the engine and
check the whole unit. Do not use
it until the trouble has been prop-
erly corrected.
5. Keep all parts of your body away
NOTE
Check and follow the local regula-
tions as to sound level and hours of
operations for the product.
■BEFORE STARTING THE
ENGINE
1. The area within a perimeter of 15
m of the person using the prod-
uct 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 simulta-
neously by two or more persons,
care should also be taken to
constantly look around or other-
wise 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
Remove any obstacle before begin-
ning work.
3. Inspect the entire unit for loose
fasteners and fuel leakage. Make
sure that the cutting attachment
is properly installed and se-
curely fastened.
4. Be sure the cutting attachment
guard is firmly attached in
place.
5. Always use the harness. Adjust
the harness for comfort before
starting the engine. The harness
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 away from the operat-
ing point. If you are approached,
immediately stop the engine.
2. The product is equipped with a
centrifugal clutch mechanism, so
5. For safe operation
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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 could result in serious burns
or electrical shock.
■IF SOMEONE COMES
1. Guard against hazardous situa-
tions at all times. Warn adults to
keep pets and children away
from the area. Be careful if you
are approached. Injury may re-
sult from flying debris.
2. If someone calls out or otherwise
interrupts you while working, al-
ways be sure to turn off the en-
gine 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 and disconnect the spark
plug wire before performing any
maintenance or checking proce-
dures.
WARNING
The metallic parts reach high
temperatures immediately after
stopping the engine.
3. When replacing the cutting at-
tachment or any other part, or
when replacing the oil or any
lubricant, always be sure to use
only ZENOAH products or
products which have been
certified by ZENOAH for use
with the 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 ZENOAH
authorized servicing dealer for
assistance.
5. Do not use any accessory or at-
tachment other than those bear-
ing the ZENOAH mark and rec-
ommended 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 be-
coming damaged during opera-
tion or the product becoming
unable to operate properly.
■HANDLING FUEL
1. The engine of the ZENOAH
product is designed to run on a
mixed fuel, which contains high-
ly 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
are no sparks or open flames
anywhere nearby before refuel-
ing.
4. Wipe spilled fuel completely us-
ing 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.
WARNING
■CONTROLLING BLADE
THRUST
Blade thrust can cause serious
personal injury. Carefully study
this section. It is important that
5. For safe operation
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5. For safe operation
you understand what causes
blade thrust, how you can reduce
the chance of blade thrust and
how you can remain in control of
the unit if blade thrust does oc-
cur.
1. What causes blade thrust:
Blade thrust can occur when the
moving blade contacts an object
that it cannot cut. This contact
causes the blade to stop for an in-
stant and then suddenly move or
”bounce” away from the object that
was hit. The operator can lose con-
trol of the unit and the blade can
cause serious personal injury to the
operator or any person nearby if the
blade contacts any part of the
body.
2. How you can reduce the chance
of blade thrust:
(1) Recognize that blade thrust can
happen. By understanding and
knowing about bounce, you can
help eliminate the element of
surprise.
(2) Cut fibrous weeds and grass
only. Do not let the blade contact
materials it cannot cut such as
hard, woody vines and brush or
rocks, fences, metal, etc
(3) Be extra prepared for blade
thrust if you must cut where you
cannot see the blade making
contact such as in areas of
dense growth.
(4) Keep the blade sharp. A dull
blade increase the chance of
blade thrust.
(5) Avoid feeding the blade too
rapidly. The blade can bounce
away from material being cut if
the blade is fed faster than its
cutting capability.
(6) Cut only from your right to your
left.
(7) Keep your path of advance clear
of material that has been cut
and other debris.
3. How you can maintain the best
control:
(1) Keep a good, firm grip on the
unit with both hands. A firm grip
can help neutralize bounce.
Keep your right and left hands
completely around the respec-
tive handles.
(2) Keep both feet spread apart in
a comfortable stance and yet
braced for the possibility that
the unit could bounce. Do not
overreach. Keep firm footing
and balance.
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6. Set up
WARNING
• Assemble each part correctly.Wrong assembly
might cause an accident.
• Ifyoucannotdotheassemblingyourself,consult
the shop where you bought this product.
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.
(1) Buckle
(2) Frame
(3) Hook
(4) D-ring
■CONNECTING THE FLEXIBLE SHAFT
1. Remove the clamping bolt (M5xL9) in the center of
the end of the joint, and loosen the fastening bolt
(M5xL20) and the screw (M5xL18) for mounting the
throttle lever.
2. Insert the main pipe into the joint while turning it
clockwise and counterclockwise slightly.
3. Align the safety-lock hole of the joint with the hole of
the main pipe, screw the clamping bolt and fasten it
tightly.
4. Tighten the fastening clumping bolt (7) of the joint,
and fix the main pipe firmly.
[Tightening torque]
4.9 to 7.8 N•m (0.5~0.8 kg•m)
5. Screw the throttle-lever mounting screw, and fasten
it tightly.
(1) Screw (M5xL18) (5) Throttle lever
(2) Clamping bolt (M5xL9) (6) Joint
(3) Safety-lock hole (7) Clamping bolt
(4) Main pipe (M5xL20)
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.
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6. Set up
■INSTALLING DEBRIS GUARD
WARNING
Do not use this machine without the debris guard.
Fit the top of the debris guard to the gear case, install
the debris guard on the main pipe with the accessory
clamp, and tighten the debris guard evenly with two
Phillips screws (M5xL30).
[Tightening torque]
1 to 2 N•m (10 to 20 kgf•cm)
(3)
(4)
(5)
(2)
(1)
(6)
(1) Gear case
(2) Clamp
(3) Phillips screw
(M5xL30)
(4) Main pipe
(5) Safety-guard
cover
(6) Fit this part to
the gear case.
■MOUNTING THE HANDLE
1. Mount the loop handle on the main pipe in accor-
dance with the serial-number label. Turn the grip and
tighten it slightly, then fasten the hanger plate to-
gether in the position shown in SE8.
2. Adjust the position of the loop handle to the position
where you can work easily, and tighten the loop
handle firmly.
(1) Grip
(2) Hanger plate
WARNING
• Tightenthegriprmly.Ifthegripbecomesloose,
it might move while you are working, causing
danger.
• Donotloosenortwistthegripwhileyouarework-
ing.
• Alwaysstoptheengineandmakesuretheblade
has stopped before adjusting the position of the
loop handle.
■Mounting the cutting blade
WARNING
• Be sure to stop the engine before demounting
and remounting the cutting blade. Never try to
touch the blade while the engine is running.
• AlwaysuseZenoahgenuinecuttingbladesand
fittings for replacement.
• When demounting and remounting the cutting
blade, firmly secure the brush cutter and wear
heavy-duty gloves.
• Thecutterbladerotatesleft(counterclockwise)
when viewed from the gear case.When the mount-
ing side of a cutting blade is predetermined, select
the mounting side correctly when mounting it.
Particularly, when a chip saw blade is mounted
reversely, the teeth may be chipped and fly away.
This is very dangerous.
• Besuretocleanthegearshaftthreadcomplete-
ly before mounting the cutting blade. Dirt and
sand on the thread will cause loosening of the
blade mount. This is very dangerous.
• Never use a power impact driver or other high
torque tool or put all of your weight to fasten the
mounting bolt of the cutting blade. An excessive
tightening force will damage the mounting bolt or
the gear shaft and cause hazardous accident or
personal injury. Be sure to use the accompanying
socket wrench and tighten them firmly.
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6. Set up
Mounting a metal blade
WARNING
Use a blade of 255mm or less in diameter. Never use
a blade of a greater diameter. The greater blade will
damage the brush cutter or broken and exploding cut-
ter teeth may cause accidents or serious personal in-
juries.
1. Insert the accompanying Hex wrench into the loop
of the pin and pull out the pin.
(1)
Hex wrench
(2) Pin
2. Align the fixing hole of the tooth rest fitting to the
insertion hole of the gear case, and insert the Hex
wrench into the holes to lock the shaft.
3. Turn the gear case upside down and turn the blade
mounting bolt clockwise with the accompanying
socket wrench to loosen.
(1) To loosen (2) Socket wrench
4. Remove the blade mounting bolt that is assembled
with a spring washer and the Cover.
5. Clean the threaded portion of the gear shaft com-
pletely if dirty with earth and sand.
(2) Cover
(1) Blade mounting bolt
with a spring washer
(4) Gear shaft
(5) Holder (A)
(6) Gear case
(3) Holder (B)
6. Fit the blade cover to the blade. (See on Page 12.)
7. Place the blade on the Holder (A) with the marked
side of the blade faced to the gear case.
IMPORTANT
Fit the center hole of the blade exactly to the projection
of the Holder (A).
8. Fit the Cover to the gear shaft. Be careful not to re-
verse it.
(3) To tighten
(5) Hex wrench
(4) Socket wrench
(2) Blade cover
(1) Blade
9. Lock the gear shaft and the blade with the Hex
wrench, insert the blade mounting bolt that is as-
sembled with a spring washer into the Cover and
Holder (B), and tighten the bolt counterclockwise
firmly with the Hex wrench.
[Tightening torque]
14.7 to 19.6 N.m (= 150 to 200 kgf.cm)
10. Insert the pin into the insertion hole of the gear case
and make sure the gear case is firmly locked.
(1) Push the pin until
this gap disappears.
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6. Set up
Confirmation of rotational direction of the
blade
IMPORTANT
View the blade from above it and make sure the blade
is mounted correctly as shown left.
(1) Blade rotation
Remounting the blade cover
1. Fit the blade edge to the groove of the blade cover,
and lock the cover with the hook.
2. To remove the blade cover, unhook and open the
blade cover ends outward to remove the cover from
the blade.
(1) Hook
Installing the nylon cutter (available as an option)
IMPORTANT
Since the resistance of the nylon cutter is larger than
that of the metal cutter, wrong operation of the nylon
cutter will cause the clutch to overheat, deform and be
damaged. When using the nylon cutter, carefully note
the following.
• UseZENOAH’sgenuinenyloncutter.Whenusinga
commercially-available nylon cutter, make sure that
it is no longer than 10 cm in external shape.
• Makesurethatthelengthofthenyloncordis17cm
or shorter.
• Keeptheenginerotatingathighspeedwhilework-
ing.
1. Install the blade rest plate and the outer holder on
the gear shaft correctly, and stop their whirl with the
accessory L-shaped round rod.
2.Screwthemountingbolt(M7left-handed)attached
to the nylon cutter into the gear shaft, and tighten it
firmly with a wrench.
[Tightening torque]
14.7 to 19.6 N•m (150 to 200 kgf•cm)
3. Screw the main body of the nylon cutter into the
mounting bolt while fixing the blade rest plate with
the L-shaped round rod, and tighten the main body
of the nylon cutter firmly by hand.
(3)
(4)
(5)
(6)
(7)
(1)
(2)
(1) Main body of the nylon cutter
(2) L-shaped round rod
(3) Gear case
(4) Blade rest plate
(5) Outer holder
(6) Mounting bolt
(7) Nylon cord
NOTE
The bolt, washer, and other parts for mounting the blade
are required when using the metal blade. Keep them
carefully so as not to lose them.
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7. Fuel
■FUEL
WARNING
• Gasoline is very flammable. Avoid smoking 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 Zenoah engines are lubricated by oil specially
formulated for air-cooled 2-stroke gasoline engine use.
If Zenoah oil is not available, use an anti-oxidant
added quality oil expressly labeled for air-cooled
2-strokeengineuse(JASOFDGRADEOILorISO-L-
EGDGRADE).
• DonotuseBIAorTCW(2-strokewater-coolingtype)
mixed oil.
■RECOMMENDEDMIXINGRATIO
 GASOLINE40:OIL1
 Whenusingmarketoil(JASOFCgradeoilorISO-
L-EGCgradeoil)
 GASOLINE50:OIL1
 WhenusingZENOAHgenuineoil,JASOFDgrade
oilorISO-L-EGDgradeoil
• 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combustion.
• Theseenginesarecertiedto operateonunleaded
gasoline.
• Make sure to use gasoline with a minimum octane
numberof89RON(USA/Canada:87AKI).
• If you use a gasoline of a lower octane value than
prescribed, there is a danger that the engine tem-
perature 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.
■HOWTOMIXFUEL
WARNING
• 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
least one minute. As some oils may be difficult to
agitate depending on oil ingredients, sufficient agita-
tion is necessary for the engine to last long. Be care-
ful that, if the agitation is insufficient, there is an in-
creased danger of early piston seizing due to abnor-
mally 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atandbaregroundforfueling.
2. Moveatleast10feet(3meters)awayfromthefuel-
ing 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-STROKE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pe-
riod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,nor-
mal wear and change in product with no functional influ-
ence 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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GB-14
BKZ305L-EZ
8. Operation
STARTING A COOLED ENGINE
1. Set the engine stop switch to “operation.”
2. Set the throttle lever to “idling.”
(1) Throttle lever
(2) Idling
(3) Fully opened
(4) Engine stop
switch
(5) Operation
(6) Stop
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.
(2) Choke lever
(4) Close (3) Open
(1) Primer pump
5. Placetheunitonat,rm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releas-
ingtheknob.Doingsomaycauseastarterfailure.
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 carrying 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 firmly 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.
(1) Starter grip
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GB-15
BKZ305L-EZ
G
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8. Operation
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gure
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carry-
ing the unit on the back.
Otherwise,accidentalinjurymayoccur.
(1) Rope guide
(2) Rope guide
Right side
Left side
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
atclearareaandholditrmlyinplacesoasto
ensure that neither the cutting part nor the throttle
comeintocontactwithanyobstaclewhentheen-
gine starts.
■STOPPING THE ENGINE
WARNING
• Stoptheengineimmediatelyinanemergency.
• Thebladerotatesbyinertiaforawhileaftertheen-
ginehasstopped.Donottouchthebladeuntilthe
engine has stopped completely.
• Do not touch the mufer or spark plug with bare
hands immediately after the engines has stopped.
Otherwiseyoumaysufferburnsbecausethemufer
and spark plug are extremely hot.
IMPORTANT
If you stop the engine while keeping the revolution
speed high, the engine could become damaged. Return
the throttle lever to its original position and reduce the
engine speed before stopping the engine except in an
emergency.
1. Return the throttle lever to the idling position.
2. Set the engine stop switch to “stop.”
(1) Throttle lever
(2) Idling
(3) Fully opened
(4) Engine stop switch
(5) Operation
(6) Stop
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)
(2)
(1) Cable adjuster
(2) 0.04in (1-2mm)
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GB-16
BKZ305L-EZ
8. Operation
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 lever, turn the adjusting screw counter-clockwise.
(1) Idle adjusting screw
(cross screw)
(1)
NOTE
• Warmuptheenginebeforeadjustingtheidlingspeed.
PUTTING ON THE UNIT
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 confirming 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 shoul-
der 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.
HOW TO OPERATE 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.
• 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.
WARNING
• Makesuretouseshoulderstrapanddebrisguard.
Ifnot,itisverydangerouswhenyousliporlose
your balance.
CUTTING OPERATION
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.
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GB-17
BKZ305L-EZ
G
B
8. Operation
■CUTTING OPERATION
WARNING
Whenusingametalblade,donotcutgrasswiththe
righthalfoftheblade.Otherwise,themachinemight
kickback,causingaseriousinjury.
(1) Area of the blade where
the machine is prone to
kick back
WARNING
• Whenusingthismachine,readandobeythepre-
cautionsandinstructionsdescribedin“Forsafe
operation” (pages 5 to 8) of this manual.
• Beforeshoulderingthemainbodyofthebrushcut-
ter,returnthethrottlelevertotheidlingposition
andmakesurethebladehasstoppedrotating.
• Whenshoulderingthemainbodyofthebrushcut-
ter,becarefulthatthethrottlewiredoesnotget
tangled, and that the blade does not touch the
ground.
WARNING
Thisproductemploysaplottypecarburetor.Ifthe
engineistiltedtoomuch,thefuelinthebreatheror
carburetor of the fuel tank might leak out. Do not tilt
theengineupwardordownwardduringcutting,or
whenstoringortransportingthebrushcutter.
IMPORTANT
Be careful not to hit the blade against any object during
cutting. Hitting the blade against stones, etc. might
damage the blade and driving unit, or bend the main
pipe.
■WHEN USING A METAL BLADE
• Swingthebladefromrighttolefttocutgrass.
• Tocutusualgrass,usethepartofthebladecorre-
spondingto1/2ofthediameteroftheblade.Tocut
tough weeds such as Japanese pampas grass and
Solidago altisima, use the part of the blade corre-
spondingto1/3ofthediameteroftheblade.
• Adjusttherotationspeedoftheengineinaccordance
with the resistance of grass. Cut young grass at
middle speed, and cut tough and thick grass such
as Japanese mugwort and vines at high speed.
IMPORTANT
Operatingtheengineatlowspeedmightcausegrass,
weeds or twigs to be caught up in the blade. It also
wears down the clutch more quickly.
(1) Usable area of the blade
(2) Area to be used for cutting young grass
(3) Area to be used for cutting tough grass
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GB-18
BKZ305L-EZ
4. Never swing the unit so hard as you are in danger of
losing your balance or control of the unit.
5. Try to control the cutting motion with the hip rather
than placing the full workload on the arm and hands.
6. Take precautions to avoid wire, grass and dead, dry,
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.
■SELECTION OF BLADE
WARNING
• Whencuttingbranchesandplants,alwaysusea
sawblade,andneveruseaneight-toothbladeor
afour-toothblade.
• Ifyoucutgrassandplantswiththewrongtype
orsizeofblade,theblademightdamagetheshaft
andexternalpipeofthismachine.
TRIMMING GRASS AND WEEDS
• AlwaysrememberthattheTIPofthelinedoescut-
ting. 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.
2. You can avoid thrown debris by sweeping from your
left to the right.
3. Use a slow, deliberate action to cut heavy growth.
The rate of cutting motion will depend on the material
being cut. Heavy growth will require slower action than
will light growth.
Under growth
Heavy weeds
Light weeds
Grass
Nylon line head
CUTTER APPLICATION CHART
Saw blade 8-teeth blade 4-teeth blade 2-teeth blade
Select an appropriate blade to suit the material being cut.
For details, refer to the operating manual supplied with each blade.
8. Operation
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GB-19
BKZ305L-EZ
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9. Maintenance
WARNING
• Besuretostoptheenginewhencarryingoutinspectionandmaintenance.
• Donotmodifythemachineordisassembletheengine.
• UseZENOAH’sgenuinepartsordesignatedpartswhenreplacingparts.
• Ifyoucannotinspectormaintainthemachineyourself,contacttheshopwhereyouboughtit.
1 Blade
2 Debris guard
3 Grip
4 Throttle lever
5 Throttle wire
6 Fuel tank
7 Shoulder belt
8 Flexible shaft
9 Gear case
10 Parts to be tightened
• The mounting bolt has become loose. • Tighten
• Broken, cracked, chipped, or bent. • Replace
• The blade edges have worn out. • Re-sharpen or replace
• Mounted has become loose. • Tighten
• Broken. • Replace
• Oil has stuck to the grip. • Wipe off
• Does not move smoothly. • Repair or replace
• The play is too large or too small. • Repair
• The throttle wire does not move smoothly. • Repair or replace
• Fuel leaks out. • Repair or replace
• The fuel pipe has been damaged. • Replace
• Broken or cracked. • Repair or replace
• The connecting part has become loose. • Repair or replace
• Cut off, cracked, discolored, or deformed. • Replace
• The shaft has become loose. • Repair or replace
• Loose or slipped off. • Tighten or repair
� INSPECTION BEFORE AND AFTER CUTTING
Inspect the following items before and after cutting.
INSPECTION ITEMS MEASURES
25 hours 50 hours 100 hours
Removal of dust from cylinder fin O O O
Cleaning of the air cleaner element O O O
Checking, cleaning and adjustment of the spark plug O O O Gap 0.9 to 1.0 mm
Engine Cleaning of the fuel tank O O
Additional tightening of the bolt for mounting the cylinder O
Additional tightening of the parts for the engine O
Removal of the carbon from the muffler O
Supply of grease for the gear case O O O
Main body Removal of the contamination of the clutch drum O
Supply of grease for the flexible shaft O O O
� REGULAR INSPECTION
Carry out inspection for each period of use as specified below.
INSPECTION AND MAINTENANCE ITEM PERIOD OF USE REMARKS
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GB-20
BKZ305L-EZ
9. 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mufer
mayresultinapersonalinjury.
AIR FILTER
• Theairlter,ifclogged,willreducetheengineperfor-
mance. Check and clean the filter element in warm,
soapywaterasrequired.Drycompletelybeforein-
stalling. 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.
(1) Fuel filter
SPARK PLUG
• Startingfailureandmisring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 re-
placement plug, use the correct type specified by
ZENOAH.
0.9〜1.0 mm
• REPLACEMENTPLUGISANGKBPMR7A.
IMPORTANT
• Notethatusinganysparkplugotherthanthosedes-
ignated may result in the engine failing to operate prop-
erly or in the engine becoming overheated and dam-
aged.
• Toinstallthesparkplug,rstturnthepluguntilitis
finger tight, then tighten it a quarter turn more with a
socket wrench.
TIGHTENING TORQUE:150-220 kgf-cm
(14.7-21.6 N.m.)
MUFFLER
WARNING
• Inspectperiodically,themuferforloosefasten-
ers,anydamageorcorrosion.Ifanysignofex-
haust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re.
■GEAR CASE
Supply lubricating grease to the gear case every 25
hours of use.
Designatedgrease
Lithium-based heat-resistant grease (#2)
[Howtosupplygrease]
1. Remove plugs both sides of gear case, and pour
grease from the one side plug hole.
2. Stop supplying the grease when all the old grease
has been pushed out from the opposite plug hole,
and mount the plug in its original position.
3. Wipe off the pushed-out grease, and mount the blade
and the blade rest plate in their original positions.
(1)
(1) Plug
FLEXIBLE SHAFT
1. Pull out the flexible liner while pulling the stopper up-
ward.
(1) Stopper
(2) Flexible liner
(3) Gear case
2. Pull out the inner shaft from the clutch housing side
hole, apply Zenoah Genuine Power Grease (Z3180-
96251) or lithium-based heat-resistant grease (#2) to
the shaft, and insert the shaft back into the liner.
(4) Inner shaft
01-BKZ305L-EZ_GB_401＿四.indd 20 14.1.20 1:33:48 PM