US-11
GZ4500
U
S
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:
Be sure to adjust the carburetor with the
bar chain attached.
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.
(1) L needle
(2) H needle
(3) Idle adjusting screw
■ 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. (F15)
[Caution]
Be sure to confirm brake operation during
daily inspection.
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
8. Operation
brake operation. Operating level varies
by bar size. (F16)
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 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. (F17)
(1) Switch
Carburetor anti-freeze mechanism
Operating the 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 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 anti-freeze
mode before use.(F18)
(1) Normal operating mode
(2) Anti-freeze mode
(3) Cylinder cover
(4) ‘Sun shine’ mark
(5) ‘Snow’ mark
Continuing to use the product in 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 normal operating
mode if there is no danger of icing
occurring.
(28 pages)
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