Zenoah G3700 Chain Brake, How to confirm Carburetor anti-freeze mechanism, Stopping Engine

G3700

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.

■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:

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.

Normal operating mode Anti-freeze mode

Cylinder cover

“Sunshine” mark “Snow” mark

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.

■HOW TO SWITCH BETWEEN OPERATING MODES

Choke knob

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-

Cylinder cover

Icing cap

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.

■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.

Switch

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).

GB-10 Snow protector