Zenoah Chainsaw G455AVS User Manual

2812-93112 (901)  
Before operating your RedMax product,  
read this manual carefully and completely.  
The engine exhaust from this product  
contains chemicals known to the State  
of California to cause cancer, birth  
defects or other reproductive harm.  
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Thank you for choosing our RedMax® chain saw.  
This manual will provide you with full understanding of the necessary  
instructions for assembly, operation and maintenance of the  
Please read it carefully before starting operation.  
For continued safe and reliable operation, use ONLY original  
RedMax parts and accessories, Adhere to all notes and warnings.  
1. For Safe Operation································································· 2  
2. Installing Guide Bar and Saw Chain ···································· 4  
3. Fuel and Chain Oil ································································· 5  
4. Operating Engine··································································· 6  
5. Sawing ·················································································· 10  
6. Maintenance ········································································· 12  
7. Maintenance of Saw Chain and Guide Bar························ 14  
8. Troubleshooting Guide························································ 17  
9. Specifications······································································· 18  
10. Parts List··············································································· 19  
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1. For Safe Operation  
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.  
8. Before you start the engine, make sure  
the saw chain is not contacting anything.  
9. 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.  
2. Use safety footwear, snug fitting clothing  
and eye, hearing and head protection  
10. Always inspect the chain saw before  
each use for worn, Ioose, or changed  
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  
3. Always use caution when handling fuel.  
Wipe up all spills and then move the  
chain saw at least ten(10) feet(three(3)  
m) from the fueling point before starting  
the engine.  
3a) Eliminate all sources of sparks or  
flame (ie. smoking, open flames, or  
work that can cause sparks) in the  
areas where fuel is mixed, poured, or  
11. All chain saw service, other than the  
items listed in the Operator’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 flywheel to disintegrate).  
3b) Do not smoke while handling fuel or  
while operating the chain saw.  
4. Do not allow other persons to be near  
the chain saw when starting the engine  
or cutting a wood. Keep bystanders and  
animals out of the work area. Children,  
pets, and bystanders should be a  
minimum of thirty(30) feet away when  
you start or operate the chain saw.  
12. Always shut off the engine before setting  
it down.  
13. Use extreme caution when cutting small  
size brush and saplings because slender  
material may catch the saw chain and be  
whipped toward you or pull you off  
5. Never start cutting until you have a clear  
work area, secure footing, and planned  
retreat path from the falling tree.  
6. Always hold the chain saw firmly with  
both hands when the engine is running.  
Use a firm grip with thumb and fingers  
encircling the chain saw handles.  
14. When cutting a limb that is under  
tension, be alert for spring back so that  
you will not be struck when the tension in  
the wood fibers is released.  
7. Keep all parts of your body away from  
the saw chain when the engine is  
15. Keep the handles dry, clean and free of  
oil or fuel mixture.  
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16. Operate the chain saw only in well  
ventilated areas. Never start or run the  
engine inside a closed room or building.  
Exhaust fumes contain dangerous  
carbon monoxide.  
19. When transporting your chain saw, make  
sure the appropriate guide bar scabbard  
is in place.  
20. This chain saw is equipped with a spark  
arrester built-in muffler. Periodically  
check the arrester to keep it in good  
17. Do not operate a chain saw in a tree  
unless specially trained to do so.  
18. 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.  
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 a lightning fast reverse 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 lose  
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.  
(1) With a basic understanding of kickback 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 fingers encircling the chain saw handles. A firm grip will help you reduce  
kickback and maintain control of the saw. Don’t let go.  
(3) Make certain that the area in which you’re cutting is free from obstructions. 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 shoulder height.  
(6) Follow manufacturers sharpening and maintenance instructions for saw chain.  
(7) Only use replacement bars and chains specified by the manufacturer or the  
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2. Installing Guide Bar and Saw Chain  
The saw chain has very sharp edges. Use  
thick protective gloves for safety.  
1. Loosen the nuts and remove the chain cover.  
2. Install the attached spike to the power unit.  
3. Gear the chain to the sprocket and, while fitting  
the saw chain around the guide bar, mount the  
guide bar to the power unit, Then adjust the  
position of chain tensioner nut on the chain  
cover to the lower hole of guide bar.  
Pay attention to the correct direction of the saw  
4. Fit the chain cover to the power unit and fasten  
the nuts to finger tightness.  
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.  
6. Tighten the nuts securely with the bar tip held  
up. Then check the chain for smooth rotation  
and proper tension while moving it by hand. If  
necessary, readjust with the chain cover loose.  
7. 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  
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3. Fuel and Chain oil  
The RedMax engines are lubricated by oil  
specially formulated for air-cooled 2-cycle  
gasoline engine use. If RedMax oil is not  
available, use an anti-oxidant added quality  
oil expressly labeled for air-cooled 2-cycle  
engine use.  
It will cause severe damage to the engine  
inner parts very quickly.  
2. GASOHOL – It can cause deterioration of  
rubber and/or plastic parts and disruption  
of engine lubrication.  
USE – It can cause spark plug fouling,  
exhaust port blocking, or piston ring  
Exhaust emission are controlled by the  
fundamental engine parameters and  
components (eq., carburation, ignition  
timing and port timing) without addition  
of any major hardware or the introduction  
of an inert material during combustion.  
These engines are certified to operate on  
un-leaded gasoline.  
The fuel is highly flammable. Do not  
smoke or bring any flame or sparks near  
Use motor oil SAE 10W-30 all year round, or  
SAE 30-40 in summer and SAE 20 in winter.  
1. Measure out the quantities of gasoline  
and oil to be mixed.  
Do not use waste or regenerated oil that  
can cause damage to the oil pump.  
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.  
5. Put a clear indication on the outside of the  
container to avoid mixing up with gasoline  
or other containers.  
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4. Operating Engine  
Starting engine  
1. Fill fuel and chain oil tanks respectively, and  
tighten the caps securely.  
2. Tilt the switch lever upward.  
3. While holding the throttle lever together with the  
throttle interlock, push in the side latch and  
release the throttle lever to hold it at the starting  
4. Pull out the choke knob to the closed position.  
When restarting immediately after stopping the  
engine, Ieave the choke knob at the open  
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5. While holding the saw unit securely on the  
ground, pull the starter rope vigorously.  
Do not start the engine while hanging the  
chain saw with a hand. The saw chain may  
touch your body. It's very dangerous.  
6. When engine has ignited first, push in the choke  
knob and pull the starter again to start the  
7. Allow the engine to warm up with the throttle  
lever pulled slightly.  
Keep clear of the saw chain as it will start  
rotating upon starting of engine.  
Checking oil supply  
After starting the engine, run the chain at medium  
speed and see if chain oil is scattered oft as shown  
in the figure.  
The chain oil flow can be changed by inserting a  
screwdriver in the hole on bottom of the clutch  
side. Adjust according to your work conditions.  
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 has been adjusted at the factory.  
Should your unit need readjustment due to the  
changes in altitude or operating conditions, please  
let your skillful dealer make the adjustment. A  
wrong adjustment may cause damage to your unit.  
If you have to make the adjustment yourself,  
please carefully follow the procedure below.  
Note :  
Be sure to adjust the carburetor with the bar  
chain attach ed.  
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1. H and L needles are restricted within the number  
of turn as shown below, because this engine  
conforms to 1995 California regulations for utility  
and lawn and garden equipment engines as  
H needle:  
L needle:  
2. Start engine and allow it to warm up in low  
speed for a few minutes.  
3. Turn idle adjusting screw (T) counterclockwise  
so that saw chain does not turn. If idling speed is  
too slow, turn the screw clockwise.  
4. Make a test cut adjust the H needle for best  
cutting power, not for maximum speed.  
Icing prevention system  
This system prevents icing of the carburetor which  
sometimes happen while sawing in winter.  
When your saw is possible to be frozen at the  
carburetor during operation, use the system as  
1. Loosen a screw and remove the screen on the  
back of the air cleaner cover.  
2. Turn the screen a half and reinstall to the cover.  
Never use the system in normal  
temperature because that can cause  
starting failure due to overheating of the  
When using the saw with the anti-icing setting,  
frequently check the screen and keep it clean of  
saw dust.  
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Chain brake  
This machine is equipped with an automatic brake  
to stop saw chain rotation upon occurrence of  
kickback while in saw cutting operation. The brake  
is automatically operated by inertial force which  
acts on the weight fitted inside the front gurd.  
This brake can also 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.  
Be sure to confirm brake operation on the daily  
How to confirm:  
1) Turn off the engine.  
2) Holding the chain saw horizontally, release your  
hand from the front handle, hit the tip of the  
guide bar to a stump or a piece of wood, and  
confirm brake operation. Operating level varies  
by bar size.  
In case the brake is not effective, ask our dealer  
inspection and repairing.  
The engine, if being kept rotated at high speed with  
the brake engaged, heats the clutch, causing a  
trouble. When the brake is operated while in  
operation, immediately release your fingers from  
the throttle lever and stop the engine.  
Stopping engine  
1. Release the throttle lever to allow the engine  
idling for a few minutes.  
2. Move the switch lever downward.  
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5. Sawing  
• This saw is also equipped with a chain  
brake that will stop the chain in the event  
of kickback if operating properly. You  
must check the chain brake operation  
before each usage by running the saw at  
full throttle for 1 or 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 then replace the brake band  
and clutch drum before use.  
• It is extremely important that the chain  
brake be checked for proper operation  
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, inadequate maintenance,  
or incorrect replacement of the bar or  
chain may increase the risk of serious  
personal injury due to kickback.  
• Before proceeding to your job, read “For  
Safe Operation” section. It is  
recommended to first practice sawing  
easy logs. This also helps you get  
accustomed to your unit.  
• It is not necessary to force the saw into  
the cut. Apply only light pressure while  
running the engine at full throttle.  
• Racing the engine with the chain seized in  
a cutaway can damage the clutch system.  
When the 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 cut.  
• This saw is equipped with a special “low  
kickback” chain that greatly reduces the  
severty of kickback should it occur.  
• The saw chain has been tested in  
accordance with American National  
Standard Safety Specifications for  
gasoline powered chain saw (ANSI  
B175.1 1985) as having an acceptable  
low kickback level. On this saw never use  
any chain other than those recommended  
on page 12 of this manual, or which is not  
designated as meeting the ANSI B175.1  
kickback levels on this saw.  
• Low kickback saw chains are chains  
which have met the kickback  
requirements of ANSI B175.1 when tested  
on the representative samples of chain  
saws below 3.8 C.I.D. specified in ANSI  
[CAUTION!] When you fell a tree, be sure to  
warn your neighboring workers of the  
• The guide bar supplied with this saw has  
an under 1.2 inch radius sprocket nose  
which produces a specific kickback  
energy. Never use a bar with a larger  
recommended on page 12.  
• The length of bars has a great effect on  
kickback. Use only those length as  
specified on page 12.  
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1. Decide the felling direction considering the  
wind, Iean of the tree, location of heavy  
branches, ease of job after felling, and  
other factors .  
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.  
• Limbing a felled tree  
Be alert to the spring back of a cut limb.  
1. Always ensure your foothold as well as  
stability of the tree.  
2. Be alert to the rolling over of a cut log.  
3. Read the instructions in “For Safe  
Operation” to avoid kickback of the  
First check which way the limb is bent. Then  
make a shallow cut into the compressed side  
to prevent the limb from being torn. Cut  
through from the tensed side.  
Before starting work, check the direction of  
bending force inside the log to be cut.  
Always finish cutting from the opposite side  
of bending direction to prevent the guide bar  
from being caught in the cutaway.  
• Cutting an unpillowed log  
Saw down halfway, then roll the log over and  
cut from the opposite side.  
• Pruning  
1. Do not use an unstable foothold or a  
2. Do not overreach.  
3. Do not cut above shoulder height.  
4. Always use both hands to grip the saw.  
Cut up from the bottom, finish down from the  
• Cutting a pillowed log  
In the area A in the picture right above, saw  
up from the bottom one-third and finish by  
sawing down from the top. In the area B,  
saw down from the top one-third and finish  
by sawing up from the bottom.  
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6. Maintenace  
Before cleaning, inspecting or repairing  
your unit, make sure that engine has  
stopped and is cool. Disconnect the spark  
plug to prevent accidental starting.  
A. Maintenance after each use  
1. Air filter  
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.  
2. Oiling port  
Dismount the guide bar and check the oiling port  
for clogging.  
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.  
4. Others  
Check for fuel leakage and loose fastenings and  
damage to major parts, especially handle joints  
and guide bar mounting. If any defects are found,  
make sure to have them repaired before operating  
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