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G455AVS / G500AVS
GB-10
■ 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 car-
buretor, and this in turn may cause the output power of
the engine to be reduced or for the engine to fail to op-
erate smoothly.
This product has accordingly been designed with a ven-
tilation hatch on the right side of the surface of the cylin-
der 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.
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 prop-
erly 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 occurring.
■ 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, frequently
check the screen and keep it clean of saw dust.
NOTE
When using the unit at times when it is snowing. Zenoah
recommends that you also use a snow protector effec-
tive in preventing the air filter from freezing (e.g., the
separately-sold Z2881-98610 snow protector).
1. H and L needles are restricted within the number of
turn as shown below.
G455AVS G500AVS
H needle : -
1
/
4
-
1
/
4
L needle : -
1
/
4
-
1
/
4
2. Start the engine and allow it to warm up in low speed
for a few minutes.
3. Turn the idle adjusting screw (T) counterclockwise
so that the saw chain does not turn. If the idling
speed is too slow, turn the screw clockwise.
4. Make a test cut and adjust the H needle for best
cutting power, not for maximum speed.
■ CHAIN BRAKE
This machine is equipped with an automatic brake to
stop saw chain rotation upon occurrence of kickback
during saw cutting. The brake is automatically operated
by inertial force, which acts on the weight fitted inside
the front guard.
This brake can also be operated manually with the front
guard turned down to the guide bar.
To release the brake, pull up the front guard toward the
front handle till a “click” sound is heard.
[Caution]
Be sure to confirm brake operation during daily inspec-
tion.
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 op-
eration. Operating level varies by bar size.
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 causing trouble.
When the brake engages during operation, immediately
release the throttle lever to stop the engine.
Snow protector
(4) Normal operating mode
(5) Anti-freeze mode
(6) Screen
(1) Air cleaner cover
(2) Shutter plate
(3) Screw