Zenoah Chainsaw G2000T User Manual

848C0593A0 (704)  
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Read operator's instruction  
Wear head, eye and ear  
book before operating this  
Use the chain saw  
with two hands.  
Warning! Danger of  
Read, understand and  
follow all warnings.  
Never touch hot surface.  
1. For Safe Operation ................................................................... 4  
2. Explanation of Symbols on the Machine .................................. 8  
3. Installing Guide Bar and Saw Chain......................................... 9  
4. Fuel and Chain Oil .................................................................. 10  
5. Operating the Engine ............................................................. 11  
6. Sawing .................................................................................... 12  
7. Maintenance ........................................................................... 14  
8. Maintenance of Saw Chain and Guide Bar ............................ 15  
9. Troubleshooting Guide ........................................................... 16  
10. Disposal .................................................................................. 16  
11. Specifications ......................................................................... 16  
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1. For safe operation  
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.  
10. Keep all parts of your body away from  
the saw chain when the engine is run-  
2. Use safety footwear, snug fitting  
clothing and eye, hearing and head  
protection devices.  
Use the vibration-proof glove.  
11. Before you start the engine, make  
sure the saw chain is not contacting  
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.  
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.  
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 damage  
to the flywheel could occur which  
could subsequently cause the fly-  
wheel to disintegrate.)  
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-  
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.  
15. Always shut off the engine before  
setting it down.  
7. Do not allow other persons to be near  
the chain saw when starting or cut-  
ting. Keep bystanders and animals  
out of the work area. Children, pets  
and bystanders should be a minimum  
of 10 m away when you start or oper-  
ate the chain saw.  
16. Use extreme caution when cutting  
small size brush and saplings be-  
cause slender material may catch the  
saw chain and be whipped toward  
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 ten-  
sion 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 operation.  
19. Keep the handles dry, clean and free  
of oil or fuel mixture.  
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  
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20. Operate the chain saw only in well  
ventilated areas. Never start or run  
the engine inside a closed room or  
building. Exhaust fumes contain dan-  
gerous carbon monoxide.  
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  
handles. A firm grip will help you re-  
duce kickback and maintain control  
of the saw.  
21. Do not operate the chain saw in a tree  
unless specially trained to do so.  
(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.  
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 dan-  
gerous loss of control of the chain  
(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.  
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  
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 difficulty picking up small objects such  
as screws or nails;  
because of high temperature.  
(1) muffler guard  
(2) guide bar  
(3) saw chain  
the vibration white finger could happen more fre-  
quently and affect more of your fingers.  
Please observe the following matter, in order to pro-  
tect 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 vi-  
2. Check tools before using them to make sure they  
have been properly maintained and repaired to avoid  
increased 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:  
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  
l i g h t n i n g f a s t r e v e r s e  
reaction,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 towards 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 several  
steps to keep cutting jobs free from  
accident or injury.  
keeping warm and dry (when necessary, wear  
gloves, a hat, waterproofs and use heating pads if  
giving up or cutting down on smoking because  
smoking reduces blood flow; and massaging and  
exercising your fingers  
(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  
When disposing your machine, fuel or oil for the ma-  
chine, be sure to allow your local regulations.  
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The saw should only be attached to the recommended  
attachment points on the harness. These may be at  
mid-point (front or rear) or at the sides. Where possible  
attaching the saw to centre rear mid-point will keep it  
clear of climbing lines and support its weight centrally  
down the operator’s spine.  
This chapter sets out working practices to reduce the  
risk of injury from tree service chainsaws when working  
at height from a rope and harness. While it may form  
the basis of guidance and training literature, it should  
not be regarded as a substitute for formal training.  
General requirements working at height  
Operators of tree service chainsaws working at height  
from a rope and harness should never work alone. A  
competent ground worker trained in appropriate emer-  
gency procedures should assist them.  
Operators of tree service chainsaws for this work should  
be trained in general safe climbing and work position-  
ing techniques and shall properly equipped with har-  
nesses, ropes, strops, karabiners and other equipment  
for maintaining secure and safe working positions for  
both themselves and the saw.  
Preparing to use the saw in the tree  
When moving the saw from any attachment point to an-  
other, operators should ensure it is secured in the new  
position before releasing it from the previous attachment  
The chainsaw should checked, fuelled, started and  
warmed up by the ground worker before it is sent up to  
the operator in the tree. The chainsaw should be fitted  
with a suitable strop for attaching to the operator’s har-  
Using the chainsaw in the tree  
An analysis of accidents with these saws during tree  
service operations shows the primary cause as being  
inappropriate one-handed use of the saw. In the vast  
majority of accidents, operators fail to adopt a secure  
work position witch allows them to hold both handles of  
the saw. This results in an increased risk of injury due  
not having a firm grip on the saw if it kicks back;  
• a lack of control of the saw such that it is more liable  
to contact climbing lines and operators body (par-  
ticularly the left hand and arm)  
• losing control from insecure work position resulting in  
contact with the saw (unexpected movement during  
operation of the saw)  
a) secure the strop around the attachment point on the  
rear of the saw;  
Securing the work position for two-handed use  
To allow the operator to hold the saw with both hands,  
they should as general rule, aim for secure work posi-  
tion where they are operating the saw at:  
• hip level when cutting horizontal sections;  
• solar plexus level when cutting vertical sections.  
Where the operator is working close into vertical stems  
with a low lateral forces on their work position, then a  
good footing may be all that is needed to maintain a  
secure work position. However as operators move away  
from the stem, they will need to take steps to remove or  
counteract the increasing lateral forces by, for example,  
a re-direct of the main line via a supplementary anchor  
point or using an adjustable strop direct from the har-  
ness to a supplementary anchor point.  
b) provide suitable karabiners to allow indirect (i.e. via  
the strop) and direct attachment (i.e. at the attach-  
ment point on the saw) of saw to the operators har-  
c) ensure the saw is securely attached when it is being  
sent up to the operator;  
d) ensure the saw it secured to the harness before it is  
disconnected from the means of ascent.  
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One-hand use of the chainsaw  
Operators should not use tree service chainsaws one-  
handed in place of unstable work positioning or in pref-  
erence to a handsaw when cutting small diameter wood  
at the branch tips.  
Tree service chainsaws should only be used one-handed  
• the operator cannot gain a work position enabling two-  
handed use; and  
• they need to support their working position with one  
hand; and  
• the saw is being used at full stretch, at right angles to  
and out of line with the operator’s body.  
Gaining a good footing at the working position can be  
assisted by use of a temporary foot stirrup created from  
an endless sling.  
Operators should never:  
• cut with the kickback zone at the tip of the chainsaw  
guide bar  
• ‘hold and cut’ sections  
Starting the saw in the tree  
• attempt to catch falling sections.  
When starting the saw in the tree, the operator should:  
a) apply the chain brake before starting;  
Freeing a trapped saw  
b) hold saw on either the left or right of the body when  
If the saw should become trapped during cutting, op-  
erators should:  
1) on the left side hold the saw with either the left hand  
on the front handle or the right hand on the rear  
handle and thrust the saw away from the body while  
holding the pull starter cord in the other hand;  
2) on the right side, hold the saw with the right hand on  
either handle and thrust the saw away from the body  
while holding the pull starter cord in the left hand.  
• switch off the saw and attach it securely to the tree  
inboard (i.e. towards the truck side) of the cut or to a  
separate tool line;  
• pull the saw from the kerf whilst lifting the branch as  
• if necessary, use a handsaw or second chain saw to  
release the trapped saw by cutting a minimum of 30  
cm away from the trapped saw.  
The chain brake should always be engaged before low-  
ering a running saw onto its strop.  
Operators should always check the saw has sufficient  
fuel before undertaking critical cuts.  
Whether a handsaw or a chainsaw is used to free a stuck  
saw, the release cuts should always be outboard (to-  
ward the tips of the branch), in order to prevent the saw  
being taken with the section and further complicating  
the situation.  
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2. Explanation of 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 any mistake.  
The port to refuel “MIX GASOLINE”  
Position: Fuel cap  
The port to top up chain oil  
Position: Oil cap  
Setting the switch to the “O” position, the engine stops immediately.  
Position: Front at the top of the rear handle  
Starting the engine. If you turn the choke knob to the point of the arrow,  
you can set the starting mode as follows:  
Position: Right side of the rear handle  
The screw under the “H” stamp is The High-speed adjustment screw.  
The screw under the “L” stamp is The Slow-speed adjustment screw.  
The screw at the left of the “T” stamp is the Idle adjustment screw.  
Position: Left side of the rear handle  
Shows the directions that the chain brake is released (white arrow) and  
activated (black arrow).  
Position: Front of the chain cover  
If you turn the rod by screwdriver follow the arrow to the "MAX" position,  
the chain oil flow more, and if you turn to the "MIN" position, less.  
Position: Top of the power unit  
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3. Installing Guide Bar and Saw Chain  
A standard saw unit package contains the items as illustrated.  
Power unit  
Bar protector  
Plug wrench  
Guide bar  
Saw chain  
Screwdriver for  
carburetor adjustment  
Open the box and install the guide bar and the saw  
chain on the power unit as follows:  
When installing the chain cover, be sure to fit the hook  
completely at the rear end of the cover.  
The saw chain has very sharp edges. Use thick pro-  
tective gloves for safety.  
5. 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. 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. Mount the guide bar then fit the saw chain around  
the bar and sprocket.  
Saw chain  
6. Tighten the nuts securely with the bar tip held up  
(11.8-14.7 N.m./120-150 kg-cm). Then check the  
chain for smooth rotation and proper tension while  
moving it by hand. If necessary, readjust with the  
chain cover loose.  
Stud bolt  
Tensioning nut  
Pay attention to the correct direction of the saw chain.  
Moving direction  
7. Tighten the tensioner screw.  
4. Fit the chain tensioner nut into the lower hole of the  
guide bar, then install the chain cover, and fasten  
the mounting nut to finger tightness.  
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  
itseif and the guide bar.  
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4. Fuel and Chain Oil  
4. Pour in the rest of gasoline and agitate again for at least  
one minute. As some oils may be difficult to agitate de-  
pending on oil ingredients, sufficient agitation is nec-  
essary 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  
• 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 refuel-  
ing the unit. Select outdoor bare ground for fuel-  
ing and move at least 3 m (10 ft) away from the  
fueling point before starting the engine.  
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.  
• 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  
1. Select 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.  
• Do not use BIA or TCW (2-stroke water-cooling type)  
mixed oil.  
1. FUEL WITH NO OIL (RAW GASOLINE) – It will cause  
severe damage to the internal engine parts very  
2. GASOHOL – It can cause deterioration of rubber  
and/or plastic parts and disruption of engine lubri-  
<when using ZENOAH genuine oil>  
3. OIL FOR 4-CYCLE ENGINE USE – It can cause spark  
plug fouling, exhaust port blocking, or piston ring  
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.  
• Exhaust emission are controlled by the funda-  
mental engine parameters and components (eq.,  
carburation, ignition timing and port timing) with-  
out addition of any major hardware or the intro-  
duction of an inert material during combustion.  
• These engines are certified to operate on unleaded  
• 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.  
6. In the case of scrapping the used mixed oil con-  
tainer, scrap it only at an authorized repository site.  
• 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.  
As for details of quality assurance, read the descrip-  
tion 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 care-  
ful 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.  
Use motor oil SAE #10W-30 all year round or SAE  
#30 ~ #40 in summer and SAE #20 in winter.  
• Pay attention to agitation.  
1. Measure out the quantities of gasoline and oil to be  
2. Put some of the gasoline into a clean, approved fuel  
3. Pour in all of the oil and agitate well.  
Do not use wasted or regenerated oil that can cause  
damage to the oil pump.  
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5. Operating the Engine  
6. When engine has ignited, first turn in the choke knob  
to the first-stage position (2) and then pull the starter  
again to start the engine.  
7. Allow the engine to warm up with the throttle lever  
pulled slightly.  
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.  
Normal start  
1. Fill fuel and chain oil tanks respectively, and tighten  
the caps securely.  
Keep clear of the saw chain as it will start rotating  
upon starting of engine.  
Fuel tank cap  
Oil tank cap  
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  
2. Continuously push the priming bulb until fuel comes  
in the bulb.  
After starting the engine, run the chain at medium speed  
and see if chain oil is scattered off as shown in the fig-  
3. Set the switch to “I” position.  
The chain oil flow can be changed by lever. Adjust ac-  
cording to your work conditions.  
Safety lever  
Throttle lever  
4. Turn the choke knob to the closed position.  
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.  
Open with  
Throttle Lock release  
Idle adjusting  
• When restarting immediately after stopping the en-  
gine, Choke knob in the open position.  
H needle  
L needle  
5. While holding the saw unit securely on the ground,  
pull the starter rope vigorously.  
The carburetor on your unit has been factory adjusted, but may  
require fine tuning due to a change in operating conditions.  
Before adjusting the carburetor, make sure that the provided  
air/fuel filters are clean and fresh and the fuel properly mixed.  
When adjusting, take the following steps:  
Use genuine driver with lean angle to adjust needles.  
Be sure to adjust the carburetor with the bar chain  
Do not start the engine while hanging the ghain  
saw with a hand. The saw chain may touch your  
body. It's very dangerous.  
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1. H and L needles are restricted within the number of  
turn as shown below.  
When the brake operates, release the throttle lever  
to slow down the engine speed. Continuous opera-  
tion with the brake engaged will generate heat from  
the clutch and may cause trouble.  
H needle : 13/8 ± 1/4  
L needle : 11/8 ± 1/4  
At machine inspection prior to each job, check the  
operating condition of the brake following the steps.