Zenoah G4500 User manual

GB-1
G4500
G
B
G4500
OWNER’S MANUAL
CHAIN SAW
115 40 09-38 (010)
G
B

GB-2
G4500
EXPLANATION OF SYMBOLS AND SAFETY WARNINGS
Contents
1. For Safe Operation.....................................................................3
2. Explanation of Symbols on the Machine....................................5
3. Installing Guide Bar and Saw Chain ..........................................6
4. Fuel and Chain Oil .....................................................................7
5. Operating the Engine.................................................................8
6. Sawing .....................................................................................10
7. Maintenance ............................................................................12
8. Maintenance of Saw Chain and Guide Bar..............................13
9. Troubleshooting Guide.............................................................14
10. Disposal ...................................................................................14
11. Specifications...........................................................................15
Read operator's instruction
book before operating this
machine.
Wear head, eye and ear
protection.
Use the chain saw
with two hands.
Warning! Danger of
kickback.
Read, understand and
follow all warnings. Never touch hot surface.

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1. For safe operation
WARNING
This chainsaw has been especially designed for tree
maintenance and should therefore only be used by
trained operators when working on trees.
1. Never operate a chain saw when you
are fatigued, ill, or upset, or under
the influence of medication that may
make you drowsy, or if you are under
the influence of alcohol or drugs.
2. Use safety footwear, snug fitting
clothing and eye, hearing and head
protection devices.
Use the vibration-proof glove.
3. Keep the saw chain sharp and the
saw, including the AV system, well
maintained. A dull chain will increase
cutting time, and pressing a dull
chain through wood will increase the
vibrations transmitted to your hands.
A saw with loose components or with
damaged or worn AV buffers will also
tend to have higher vibration levels.
4. Always use caution when handling
fuel. Wipe up all spills and then move
the chain saw at least 3 m from the
fueling point before starting the en-
gine.
5. Eliminate all sources of sparks or
flame (i.e. smoking, open flames, or
work that can cause sparks) in the
areas where fuel is mixed, poured,
or stored.
6. Do not smoke while handling fuel or
while operating the chain saw.
7. Do not allow other persons to be
near the chain saw when starting or
cutting. Keep bystanders and ani-
mals out of the work area. Children,
pets and bystanders should be a
minimum of 10 m away when you
start or operate the chain saw.
8. Never start cutting until you have a
clear work area, secure footing, and
a planned retreat path from the fall-
ing tree.
9. Always hold the chain saw firmly with
both hands when the engine is run-
ning. Use a firm grip with thumb and
fingers encircling the chain saw
handles.
10. Keep all parts of your body away
from the saw chain when the engine
is running.
11. Before you start the engine, make
sure the saw chain is not contacting
anything.
12. Always carry the chain saw with the
engine stopped, the guide bar and
saw chain to the rear, and the muffler
away from your body.
13. Always inspect the chain saw before
each use for worn, Ioose, or dam-
aged parts. Never operate a chain
saw that is damaged, improperly
adjusted, or is not completely and
securely assembled. Be sure that the
saw chain stops moving when the
throttle control trigger is released.
14. All chain saw service, other than the
items listed in the Owner’s Manual,
should be performed by competent
chain saw service personnel. (E.g.,
if improper tools are used to remove
the flywheel, or if an improper tool is
used to hold the flywheel in order to
remove the clutch, structural dam-
age to the flywheel could occur
which could subsequently cause the
flywheel to disintegrate.)
15. Always shut off the engine before
setting it down.
16. Use extreme caution when cutting
small size brush and saplings be-
cause slender material may catch
the saw chain and be whipped to-
ward you or pull you off balance.
17. When cutting a limb that is under ten-
sion, be alert for spring- back so that
you will not be struck when the tension
in the wood fibers is released.
18. Never cut in high wind, bad weather,
when visibility is poor or in very high
or low temperatures. Always check
the tree for dead branches which
could fall during the felling opera-
tion.
19. Keep the handles dry, clean and free
of oil or fuel mixture.

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(1) cover (2) guide bar
(3) saw chain (4) nut
20. Operate the chain saw only in well
ventilated areas. Never start or run
the engine inside a closed room or
building and potentially explosive
atmosphere. Exhaust fumes contain
dangerous carbon monoxide.
21. Do not operate the chain saw in a tree
unless specially trained to do so.
22. Guard against kickback. Kickback
is the upward motion of the guide
bar which occurs when the saw
chain at the nose of the guide bar
contacts an object. Kickback can
lead to dangerous loss of control of
the chain saw.
23. When transporting your chain saw,
make sure the appropriate guide bar
scabbard is in place.
24. Never touch the cover, guide bar, saw
chain or nut with bare hands while
the engine is in operation or immedi-
ately after shutting down the engine.
Doing so could result in serious burns
because of high temperature.
KICKBACK SAFETY PRECAUTIONS
FOR CHAIN SAW USERS
WARNING
• Kickbackmayoccurwhenthenose
or tip of the guide bar touches an
object, or when the wood closes in
and pinches the saw chain in the cut.
Tip contact in some cases may cause
alightningfastreversereaction,kicking
the guide bar up and back towards
the operator. Pinching the saw chain
along the top of the guide bar may
push the guide bar rapidly back to-
wards the operator. Either of these
reactions may cause you to Iose
control of the saw, which could result
in serious personal injury.
• Donotrelyexclusivelyonthesafety
devices built into your saw. As a
chain saw user you should take sev-
eral steps to keep cutting jobs free
from accident or injury.
(1) With a basic understanding of kick-
back you can reduce or eliminate the
element of surprise. Sudden surprise
contributes to accidents.
(2) Keep a good grip on the saw with
both hands, the right hand on the rear
handle, and the left hand on the front
handle, when the engine is running.
Use a firm grip with thumbs and fin-
gers encircling the chain saw han-
dles. A firm grip will help you reduce
kickback and maintain control of the
saw.
(3) Make certain that the area in which
you are cutting is free from obstruc-
tions. Do not let the nose of the guide
bar contact a log, branch, or any
other obstruction which could be hit
while you are operating the saw.
(4) Cut at high engine speeds.
(5) Do not overreach or cut above shoul-
der height.
(6) Follow the manufacturer’s sharpening
and maintenance instructions for the
saw chain.
(7) Only use replacement bars and
chains specified by the manufacturer
or the equivalent.
WORSE EFFECTS OF VIBRATION
If you continue to use high-vibration tools these
symptoms will probably get worse, for example:
• thenumbnessinyourhandscouldbecomeperma-
nent and you won’t be able to feel things at all;
• youwillhavedifcultypickingupsmallobjectssuch
as screws or nails;
• thevibrationwhitengercouldhappenmorefre-
quently and affect more of your fingers.
FOR PROTECTING YOUR BODY FROM VIBRATION
Please observe the following matter, in order to
protect the health of your body.
1. Always use the right tool for each job (to do the job
more quickly and expose you to less hand-arm
vibration).
2. Check tools before using them to make sure they have
been properly maintained and repaired to avoid in-
creased vibration caused by faults or general wear.
3. Make sure cutting tools are kept sharp so that they
remain efficient.
4. Reduce the amount of time you use a tool in one
go, by doing other jobs in between.
5. Avoid gripping or forcing a tool or workpiece more
than you have to.
6. Store tools so that they do not have very cold
handles when next used.
7. Encourage good blood circulation by:
• keeping warm and dry (when necessary, wear
gloves, a hat, waterproofs and use heating pads if
available);
• giving up or cutting down on smoking because
smoking reduces blood flow; and massaging and
exercising your fingers
DISPOSAL
• Whenyoudisposeofthemachine,donotdisas-
semble the machine.
• Whenyoudisposeofthemachine,fuel,chainoil,
be sure to follow your local regulations.

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2. Explanation of Symbols on the Machine
WARNING
• Forsafeoperationandmaintenance,symbolsarecarvedinreliefonthemachine.
 Accordingtotheseindications,pleasebecarefulnottomakeanymistake.
The screw under the “H” stamp is The High-speed adjustment screw.
The port to refuel “MIX GASOLINE”
Position: Fuel cap
The port to top up chain oil
Position: Oil cap
Setting the switch to the “ | ” position, the engine starts.
Setting the switch to the “O” position, the engine stops immediately.
Position: Rear-left of the unit
Pulling out the choke knob, the choke closes.
Position: rear-right of the on it.
The indication regarding the chain oil adjuster nut.
“MIN” direction-the oil flow decrease
“MAX” direction-the oil flow increase
Position: bottom of the clutch side
The screw at the left of the “T” stamp is the Idle adjustment screw.
Position: Left side of the rear handle
The screw under the “L” stamp is The Slow-speed adjustment screw.
CHAIN OIL
MINMAX

GB-6
G4500
5. Fit the chain cover to the power unit and fasten the
nuts to finger tightness.
6. While holding up the tip of the bar, adjust the chain
tension by turning the tensioner screw until the tie
straps just touch the bottom side of the bar rail.
(1) Tensioner
screw
(2) Loosen
(3) Tighten
7. Tighten the nuts securely with the bar tip held up (12
~ 15 N·m). Then check the chain for smooth rotation
and proper tension while moving it by hand. If neces-
sary, readjust with the chain cover loose.
8. Tighten the tensioner screw.
NOTE
A new chain will expand its length in the beginning of
use. Check and readjust the tension frequently as a
loose chain can easily derail or cause rapid wear of
itself and the guide bar.
3. Installing Guide Bar and Saw Chain
A standard saw unit package contains the items as illustrated.
Open the box and install the guide bar and the saw
chain on the power unit as follows:
WARNING
• Thesawchainhasverysharpedges.Usethick
protectiveglovesforsafety.
1. Pull the guard towards the front handle to check that
the chain brake is not engaged.
2. Loosen the nuts and remove the chain cover.
3. Install the attached spike to the power unit.
4. Gear the chain to the sprocket and, while fitting the
saw chain around the guide bar, mount the guide
bar to the power unit. Adjust the position of chain
tensioner nut on the chain cover to the lower hole of
guide bar.
(1) Hole
(2) Tensioner nut
(3) Chain cover
NOTE
Pay attention to the correct direction of the saw chain.
Moving direction
Power unit
Bar protector
Guide bar
Saw chain Spike and mounting screws
Plug
wrench
Bag Screw
driver
File
round Grip

GB-7
G4500
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4. Fuel and Chain Oil
■FUEL
WARNING
• Gasoline is very flammable. Avoid smoking or
bringinganyame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-cycle gasoline engine use.
If 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
 (whenusingZENOAHgenuine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: 87AL).
• 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 contain-
ers.
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
fuelingpointbeforestartingtheengine.
3. Stoptheenginebeforerefuelingtheunit.Atthat
time, be sure to sufciently 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 lubrica-
tion.
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 carbu-
retor and result in the engine failing to operate prop-
erly.
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 con-
tainer, 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.
■CHAIN OIL
Use motor oil SAE #10W-30 all year round or SAE
#30 ~ #40 in summer and SAE #20 in winter.
NOTE
Do not use wasted or regenerated oil that can cause
damage to the oil pump.

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WARNING
• Keepclearofthesawchainasitwillstartrotating
uponstartingofengine.
■CHECKING THE OIL SUPPLY
WARNING
• Make sure to set up the bar and the chain when
checking the oil supply.
If not, the rotating parts may be exposed. It is very
dangerous.
After starting the engine, run the chain at medium speed
and see if chain oil is scattered off as shown in the fig-
ure.
Chain oil
The chain oil flow can be changed by inserting a screw-
driver in the hole on bottom of the clutch side. Adjust
according to your work conditions.
MAX
MIN
Chain oil flow
adjusting
NOTE
The oil tank should become nearly empty by the time
fuel is used up. Be sure to refill the oil tank every time
when refueling the saw.
■ADJUSTING CARBURETOR
The carburetor on your unit has been factory adjusted,
but may require fine tuning due to change in operating
conditions.
Before adjusting the carbureotor, make sure that pro-
vided are clean air/fuel filters and fresh, properly mixed
fuel.
When adjusting, take the following steps:
NOTE
Be sure to adjust the carburetor with the bar chain at-
tached
(1) L needle
(2) H needle
(3) Idle adjusting screw
WARNING
• Itisverydangeroustorunachainsawthatmounts
brokenpartsorlacksanyparts.
 Beforestartingengine,makesurethatalltheparts
includingbarandchainareinstalledproperly.
■STARTING THE ENGINE
1. Fill fuel and chain oil tanks respectively, and tighten
the caps securely.
(1) Chain oil
(2) Fuel
2. Set the switch to “I” position.
Switch
3. Pull out the choke knob to the closed position.
Choke knob
NOTE
When restarting immediately after stopping the engine,
leave the choke knob at the open position.
4. While holding the saw unit securely on the ground,
pull the starter rope vigorously.
WARNING
• Donotstarttheenginewhilethechainsawhangs
inonehand.Thesawchainmaytouchyourbody.
Thisinverydangerous.
5. When engine has ignited first, pull the throttle lever
to return the choke knob to the open position and
then pull the starter again to start the engine.
6. Allow the engine to warm up with the throttle lever
pulled slightly.
5. Operating the Engine

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WARNING
• Continuingtousetheproductintheantifreeze
mode even when temperatures have risen and
returnedtonormal,mayresultintheenginefailing
tostartproperlyorintheenginefailingtooperate
atitsnormalspeed,andforthisreasonyoushould
always be sure to return the unit to the normal
operatingmodeifthereisnodangeroficingoc
curring.
■
HOW TO SWITCH BETWEEN OPERATING MODES
1. Flip the engine switch to turn off the engine.
2. Remove the air cleaner cover from the cylinder
cover
3. Loosen a screw and remove the screen on the back
of the air cleaner cover.
4. Turn the screen a half and reinstall to the cover.
When using the saw with the anti-freeze mode, fre-
quently check the screen and keep it clean of saw
dust.
(4) Normal operating mode
(5) Anti-freeze mode
(6) Screen
(1) Air cleaner cover
(2) Shutter plate
(3) Screw
NOTE
Whenusingtheunitattimeswhenitissnowing.Ze-
noah recommends that you also use a snow protector
effective in preventing the air filter from freezing (e.g.,
theseparately-soldZ2881-98610snowprotector).
Snow protector
1. Stop engine and screw in both H and L needles
until they stop. Never force. Then set them back the
initial number of turns as shown below.
H needle : 1 ± 3/8
L needle : 11/4± 1/4
2. Start engine and allow it to warm up at half-throt-
tle.
3. Turn L needle slowly clockwise to find a position
where idling speed is maximum, then set the needle
back a quarter (1/4) turn counterclockwise.
4. Turn idle adjusting screw (T) counterclockwise so
that saw chain does not turn. If idling speed is too
slow, turn the screw clockwise.
5. Make a test cut and adjust the H needle for best
cutting power, not for maximum speed.
■CHAIN BRAKE
This brake can be operated manually with the front
guard turned down to the guide bar.
To release brake, pull up the front guard toward the front
handle till “click” sound is heard.
[Caution]
Be sure to confirm brake operation on the daily inspec-
tion.
In case the brake is not effective, ask our dealer for
inspection and repairs.
If the engine keeps rotating at high speed with the brake
engaged, the clutch will overheat and it will be causing
trouble.
When the brake engages during operation, immedi-
ately release the throttle lever to stop the engine.
■STOPPING THE ENGINE
1. Release the throttle lever to allow the engine to idle
for a few minutes.
2. Set the switch to the “O” (STOP) position.
Carburetorantifreezemechanism
Operating chain saws in temperatures of 0 – 5°C at
times of high humidity may result in ice forming within
the carburetor, and this in turn may cause the output
power of the engine to be reduced or for the engine to
fail to operate smoothly.
This product has accordingly been designed with a
ventilation hatch on the right side of the surface of the
cylinder cover to allow warm air to be supplied to the
engine and to thereby prevent icing from occurring.
Under normal circumstances the product should be
used in the normal operating mode, i.e., in the mode to
which it is set at the time of shipment. However when
the possibility exists that icing may occur, the unit should
be set to operate in the anti-freeze mode before use.

GB-10
G4500
6. Sawing
• Before proceeding to your
job, read the section “For
SafeOperation”.Itisrecom
mended to first practice
sawingeasylogs.Thisalso
helps you get accustomed
toyourunit.
• Always follow the safety
regulations. The chain saw
must only be used for cut
tingwood.Itisforbiddento
cutothertypesofmaterial.
Vibrationsandkickbackvary
withdifferentmaterialsand
therequirementsofthesafe
tyregulationswouldnotbe
respected. Do not use the
chainsawasaleverforlift
ing,movingorsplittingob
jects. Do not lock it over
xedstands.Itisforbidden
tohitchtoolsorapplications
tothePTOotherthanthose
specified by the manufac
turer.
WARNING
• Itisnotnecessary to forcethe saw into the
cut. Apply only light pressure while running
the engine at full throttle.
• When`esawchainiscaughtinthecut,donot
attempt to pull it out by force, but use a wedge
or a lever to open the way.
• If the guide bar and saw chain becomes
caught in wood while operating it, stop the
engine.
Do not pry the handle with excessive force.
Use a wedge to remove the chain instead.
■GUARD AGAINST KICKBACK
•This saw is equipped with a chain
brake that will stop the chain in the
event of kickback if operating prop-
erly. You must check the chain brake
operation before each usage by run-
ning the saw at full the throttle for I -2
seconds and pushing the front hand
guard forward. The chain should stop
immediately with the engine at full
speed. If the chain is slow to stop or
does not stop, replace the brake band
and clutch drum before use.
• Itisextremelyimportantthatthechain
brake be checked for proper opera-
tion before each use and that the
chain be sharp in order to maintain
the kickback safety level of this saw.
Removal of the safety devices, inad-
equate maintenance, or incorrect re-
placement of the bar or chain may
increase the risk to serious personal
injury due to kickback.
■FELLING A TREE
Notch cut Felling cut
Felling direction
1. Decide the felling direction considering the wind,
lean of the tree, location of heavy branches, ease
of completing the task after felling and other fac-
tors.
2. While clearing the area around the tree, arrange a
good foothold and retreat path.
3. Make a notch cut one-third of the way into the tree
on the felling side.
4. Make a felling cut from the opposite side of the notch
and at a level slightly higher than the bottom of the
notch.
WARNING
• Whenyoufellatree,besuretowarnneighboring
workersofthedanger.
BuckingandLimbing
WARNING
• Alwaysensureyourfoothold.Donotstandonthe
log.
• Bealerttotherollingoverofacutlog.Especially
whenworkingonaslope,standontheuphillside
ofthelog.
• Followtheinstructionsin“ForSafeOperation”to
avoidkickbackofthesaw.
Before starting work, check the direction of bending
force inside the log to be cut. Always finish cutting from
the opposite side of the bending direction to prevent
the guide bar from being caught in the cut.

GB-11
G4500
G
B
Aloglyingontheground
Saw down halfway, then roll the log over and cut from
the opposite side.
Aloghangingofftheground
In area A, saw up from the bottom one-third and finish
by sawing down from the top. In area B, saw down from
the top one-third and finish by sawing up from the bot-
tom.
CuttingthelimbsofFallenTree
First check to which side the limb is bent. Then make
the initial cut from the bent side and finish by sawing
from the opposite side.
WARNING
• Bealerttothespringingbackofacutlimb.
PruningofStandingTree
Cut up from the bottom, finish down from the top.
WARNING
• Donotuseanunstablefootholdorladder.
• Donotoverreach.
• Donotcutaboveshoulderheight.
• Alwaysusebothyourhandstoholdthesaw.

GB-12
G4500
WARNING
• Beforecleaning, the inspecting orrepairing the
unit,makesurethatenginehasstoppedandis
cool.Disconnectthesparkplugtopreventacci
dentalstarting.
■MAINTENANCE AFTER EACH USE
1. Airlter
Dust on the cleaner surface can be removed by tapping
a corner of the cleaner against a hard surface. To clean
dirt in the meshes, split the cleaner into halves and
brush in gasoline. When using compressed air, blow
from the inside.
To assemble the cleaner halves, press the rim until it
clicks.
NOTE
When installing the main filter, make sure that the
grooves on the filter edge are correctly fit with the pro-
jections on the cylinder cover.
2. Oilingport
Dismount the guide bar and check the oiling port for
clogging.
Oiling port
3. Guidebar
When the guide bar is dismounted, remove sawdust in
the bar groove and the oiling port.
Grease the nose sprocket from the feeding port on the
tip of the bar.
Grease port
Sprocket
Oiling port
4. Others
Check for fuel leakage and loose fastenings and dam-
age to major parts, especially handle joints and guide
bar mounting. If any defects are found, make sure to
have them repaired before operating the saw again.
■PERIODICAL SERVICE POINTS
1. Cylinderns
Dust clogging between the cylinder fins will cause
7. Maintenance
overheating of the engine. Periodically check and clean
the cylinder fins in the repair specialty store.
2. Fuellter
(a) Using a wire hook, take out the filter from the filler
port.
Fuel filter
(b) Disassemble the filter and wash with gasoline, or
replace with a new one if needed.
NOTE
• Afterremovingthelter,useapinchtoholdtheend
of the suction pipe.
• When assembling the lter, take care not to allow
filter fibers or dust inside the suction pipe.
3. Oiltank
With a wire hook, take out the oil filter through the filler
port and clean in gasoline. When putting the filter back
into the tank, make sure that it comes to the front right
corner. Also clean off dirt in the tank.
Oil filter
4. Sparkplug
NGK
BPMR7A
0.6~0.7mm
Clean the electrodes with a wire brush and reset the
gap to 0.65 mm as necessary.
5. Sprocket
Check for cracks and for excessive wear interfering
with the chain drive. If the wear is considerable, replace
it with new one. Never fit a new chain on a worn sprock-
et, or a worn chain on a new sprocket.
6.FrontandReardampers
Replace if adhered part is peeled or crack is observed
on the rubber part.

GB-13
G4500
G
B
8. Maintenance of Saw Chain and Guide Bar
■SawChain
WARNING
• Itisveryimportantforsmoothandsafeoperation
toalwayskeepthecutterssharp.
The cutters need to be sharpened when:
• Sawdustbecomespowder-like.
• Youneedextraforcetosawin.
• Thecutpathdoesnotgostraight.
• Vibrationincreases.
• Fuelconsumptionincreases.
Cutter setting standards:
WARNING
• Besuretowearsafetygloves.
Before filing:
• Makesurethesawchainisheldsecurely.
• Makesuretheengineisstopped.
• Usearoundleofpropersizeforthechain.
Chain type: 21BPX
File size: 3/16 in (4.8 mm)
Place the file on the cutter and push straight forward.
Keep the file position as illustrated.
After each cutter has been filed, check the depth gauge
and file it to the proper level as illustrated.
Appropriate gauge checker
Depth gauge standard
0.025″(0.64mm)
Make the shoulder round
WARNING
• Besuretoroundoffthefrontedgetoreducethe
chanceofkickbackortiestrapbreakage.
Make sure every cutter has the same length and edge
angles as illustrated.
Cutter length
Filing angle
Side plate angle
Top plate cutting angle
■GuideBar
• Reverse the bar occasionally to prevent partial
wear.
• Thebarrailshouldalwaysbesquare.Checkforwear
of the bar rail. Apply a ruler to the bar and the outside
of a cutter. If a gap is observed between them, the
rail is normal. Otherwise, the bar rail is worn. Such a
bar needs to be corrected or replaced.
Ruler
Gap
No gap
Chain tilts
WARNING
• Thissawisequippedwithoneofthefollowinglow
kickbackbar/chaincombinations:
ZenoahPartNumber
Bar Size Guide Bar Saw Chain
18 3646-52114 848CC21B72

GB-14
G4500
9. Troubleshooting Guide
10. Disposal
• When you dispose of the machine, do not disas-
semble the machine.
• Whenyoudisposeofthemachine,fuel,chainoil,be
sure to follow your local regulations.
Case1. Startingfailure
WARNING
• Makesuretheicingpreventionsystemisnotwork
ing.
Case2. Lackofpower/Pooracceleration/
Roughidling
Case3. Oildoesnotcomeout
If the unit seems to need further service, please consult
with an authorized service shop in your area.
Check fuel for water
or substandard mix-
ture.
Check for engine
flooding.
Check spark ignition.
Replace with proper
fuel.
Remove and dry the
spark plug.
Then pull the starter
again with no choke.
Replace with a new
plug.
Check fuel for water
or substandard mix-
ture.
Check air filter and
fuel filter for clog-
ging.
Check carburetor for
inadequate adjust-
ment.
Replace with proper
fuel.
Clean.
Readjust speed nee-
dles.
Check oil for sub-
standard quality.
Check oil passage
and ports for clog-
ging.
Replace.
Clean.

GB-15
G4500
G
B
11. Specications
Powerunit:
Displacement (cm3):...............................................................................................................................................45.0
Fuel:..................................................................................................................Mixture (Gasoline 50 : Two-cycle oil 1)
(whenusingZENOAHgenuineoil)
Fuel tank capacity (cm3):.........................................................................................................................................550
Chain oil:...................................................................................................................................Motor oil SAE# 10W-30
Oil tank capacity (cm3): ...........................................................................................................................................260
Carburetor: ..........................................................................................................................................Diaphragm type
ignition system:............................................................................................................................................... Pointless
Spark plug:.............................................................................................................................................NGK BPMR7A
Oil feeding system:........................................................................................................Automatic pump with adjuster
Sprocket (Teeth x Pitch): .............................................................................................................................7T x 0.325″
Dimensions (L x W x H) (mm):............................................................................................................. 410 x 235 x 265
Dry weight
Power unit only (kg):...............................................................................................................................................4.75
Cuttinghead:
Guide bar
Type: ..................................................................................................................................................Sprocket nose
Size (in. (mm)):............................................................................................................................................ 18 (450)
Saw chain
Type: .................................................................................................................................................Oregon 21BPX
Pitch (in. (mm)): .................................................................................................................................... 0.325 (8.26)
Gauge (in. (mm)): ................................................................................................................................. 0.058 (1.47)
Power (kw/min-1) ...........................................................................................................................................2.14/9,000
Max speed (min-1) ..............................................................................................................................................13,000
Idle speed (min-1) .................................................................................................................................................2,500
Specifications are subject to change without notice.

GB-16
G4500
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ZENOAHauthorizeddealer.
WARRANTYPERIOD: Six (6) months after purchased
by end-user subject to 12 months from produced month.
(30 days If used for rental purpose)
THE PURCHASER SHALL BEAR COSTS OF TRANS-
PORTING THE UNIT TO AND FROM THE ZENOAH
DEALER.
THE PURCHASER SHALL NOT BE CHARGED FOR
DIAGNOSTIC LABOR WHICH LEADS TO THE DETER-
MINATION THAT A WARRANTED PART IS DEFECTIVE,
IF THE DIAGNOSTIC WORK IS PERFORMED AT THE
ZENOAHDEALER.
THE PURCHASER OR OWNER IS RESPONSIBLE FOR
THE PERFORMANCE OF THE REQUIRED MAINTE-
NANCE AS DEFINED BY THE MANUFACTURER IN THE
OWNER/OPERATOR MANUAL.
ANY WARRANTED PART WHICH IS NOT SCHEDULED
FOR REPLACEMENT AS REQUIRED MAINTENANCE,
OR WHICH IS SCHEDULED ONLY FOR REGULAR
INSPECTION TO THE EFFECT OF REPAIR OR “RE-
PLACE AS NECESSARY” SHALL BE WARRANTED FOR
THE WARRANTY PERIOD. ANY WARRANTED PART
WHICH IS SCHEDULED FOR REPLACEMENT AS RE-
QUIRED MAINTENANCE SHALL BE WARRANTED FOR
THE PERIOD OF TIME UP TO THE FIRST SCHEDULED
REPLACEMENT 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/OPERATOR
MANUAL FOR PROPER USE AND MAINTENANCE OF
THE UNITS ACCIDENT MISHANDLING, ALTERATION,
ABUSE, IMPROPER LUBRICATION, USE OF ANY
PARTS OR ACCESSARIES OTHER THAN THOSE
SPECIFIED BY THE COMPANY, OR OTHER CAUSES
BEYOND THE COMPANY'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.
ANY IMPLIED WARRANTY is limited to the duration of
the limited warranty. Otherwise, this limited warranty is
in lieu of all other expressed or implied warranties, in-
cluding any warranty of FITNESS FOR A PARTICULAR
PURPOSE OR USE and any implied warranty MER
CHANTABILITY otherwise applicable to this product.
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ZENOAHWEBSITE
http://www.zenoah.net