GZ4000
GB-10
Normal operating mode
Anti-freeze mode
Cylinder cover
“Sunshine” mark
“Snow” mark
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.
Please switch between modes in the repair specialty
store.
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 occurring.
Switch
1. H and L needles are restricted within the number of
turn as shown below.
H needle : -1/4
L needle : -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.
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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.
■
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.
