Zenoah G3800 Chain Brake, How to confirm, Stopping the Engine, Carburetor anti-freeze mechanism

G3800

■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.

switch

GB-10

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 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 cyl- inder cover to allow warm air to be supplied to the en- gine 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.

Normal operating mode Anti-freeze mode

Cylinder cover

“Sunshine” mark “Snow” mark

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.

■HOW TO SWITCH BETWEEN OPERATING MODES

Choke knob

Cylinder cover

Icing cap

1.Flip the engine switch to turn off the engine.

2.Remove the cover to the air filter, remove the air filter, and then remove the choke knob from the cylinder 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 cylin- der cover.

4.Press with your finger down on the icing cap located on the right-hand side of the cylinder cover to remove the icing cap.

5.Adjust the icing cap so that the “snow” mark faces up- wards 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.