G3700
GB-10
Normal operating mode
Anti-freeze mode
Cylinder cover
“Sunshine” mark
“Snow” mark
Switch
Choke knob
Icing cap
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
while in saw cutting operation. The brake is automati-
cally 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 brake, pull up the front guard toward the front
handle till “click” sound is heard.
[Caution]
Be sure to confirm brake operation on the 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 inspec-
tion 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, immedi-
ately release your fingers from the throttle lever and stop
the engine.
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STOPPING ENGINE
1. Release the throttle lever to allow the engine idling
for a few minutes
2. Put the switch to the “O” (STOP) position.
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 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 normal operating mode, i.e., in the mode to which
it is set at the time of shipment. However when the pos-
sibility exists that icing may occur, the unit should be
set to operate in anti-freeze mode before use.
WARNING
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 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 normal operating mode if there
is no danger of icing occurring.
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HOW TO SWITCH BETWEEN OPERATING MODES
1. Flip the engine switch to turn off the engine.
2. Remove the cover to the air filter, remove the air fil-
ter, and then remove the choke knob from the cylin-
der cover.
3. Loosen the screws holding the cylinder cover in
place (i.e., the three screws on the inside and the
one screw on the outside of the cover), and then
remove the cylinder cover.
4. Press with your finger down on the icing cap located
on the right-hand side of the cylinder cover to re-
move the icing cap.
5. Adjust the icing cap so that the ‘snow’ mark faces
upwards and then return it to its original position in
the cylinder cover.
6. Fix the cylinder cover back into its original position,
and then fix all other parts back into their proper
positions.
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 Z2850-98210 snow protector).
Cylinder
cover
Snow protector
