Adjusting The Carburetor; Chain Brake - Oregon PCS 3840 Manuel D'utilisation

5. Operating the Engine
The chain oil flow can be changed by inserting a
screwdriver in the hole on bottom of the clutch
side. Adjust according to your work conditions.
NOTE
The oil tank should become
nearly empty by the time fuel is used up. Be sure
to refill the oil tank every time when refueling the
saw.

• ADJUSTING THE CARBURETOR

The carburetor has been adjusted at the factory.
Should your unit need readjustment due to the
changes in altitude or operating conditions,
please let your skillful dealer make the adjust-
ment.
A wrong adjustment may cause damage to your
unit.
If you have to make the adjustment yourself,
please follow the procedure below carefully.
Before adjusting the carburetor, make sure that
the provided air/fuel filters are clean and fresh
and the fuel properly mixed.
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(1) Chain oil
(1) Chain oil flow
adjusting shaft
(2) Rich
(3) Lean
(1) "L" needle
(2) "H" needle
(3) Idle adjusting
screw
When adjusting, take the following steps:
NOTE
Be sure to adjust the carbu-
retor 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) counter-
clockwise 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.
NOTE
Over revolution of "H" needle
causes a lack of power or a poor acceleration. In
such a case please turn the "H" needle a little
counterclockwise.

• CHAIN BRAKE

This machine is equipped with an automatic
brake tostop saw chain rotation upon occur-
rence 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
inspection.
How to confirm:
1. Turn off the engine.
9
EN
(1) Front handle
(2) Released
(3) Braking
(4) Brake lever