Oregon Scientific PCS 3840 Operating Instructions Manual page 11

10 10
MM EN
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 operation. 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.
• CARBURETOR ANTI-FREEZE MECHANISM
Operating chain saws in temperatures of 0 – 5°C
at times of high humidity may result in ice form-
ing 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 the normal operating mode, i.e., in the
(1) Cylinder cover
(2) "Sunshine" mark
(3) "Snow" mark
(a) Normal operating mode
(b) Anti-freeze mode
mode 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
NOTE
Continuing to use the prod-
uct in the anti-freeze mode even when tempera-
tures 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
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 cylinder 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 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.
• 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.
5. Operating the Engine
(1) Cylinder
cover
(2) Choke knob
(3) Icing cap
(1) Switch