Oregon Chainsaw 73701540 PCS3840 2006 06 20 Operators Manual

PCS 3840
Operating Instructions Read operating instructions before use! 
Manuel d’utilisation Lire attentivement le mode d‘emploi avant chaquemise en service !
EN
73701540
FR 

1EN1. For Safe Operation
Dear Customer,
Firstly, we wish to thank you for having chosen our products and hope that the use of this machine will
be extremely satisfying for you and fully meet your expectations. This manual has been drawn up to
allow your to get to know your machine well and use it in safe and efficient conditions; please do not
forget that it is an integral part of the machine and keep it to hand to be consulted at all times and con-
sign it with the machine if you should sell or lend it...

2MM2EN1. For Safe Operation
1.Never operate a chain saw
when you are fatigued, ill, or
upset, or under the influence of
medication that may make you
drowsy, or if you are under the
influence of alcohol or drugs.
2.Use safety footwear, snug fit-
ting clothing and eye, hearing and
head protection devices.
Use the vibration-proof glove.
3.Keep the saw chain sharp and
the saw, including the AV system,
well maintained. A dull chain will
increase cutting time, and press-
ing a dull chain through wood will...

3EN1. For Safe Operation
damage to the flywheel could
occur which could subsequently
cause the flywheel to disinte-
grate.)
16.Always shut off the engine
before setting it down.
17.Use extreme caution when
cutting small size brush and
saplings because slender material
may catch the saw chain and be
whipped toward you or pull you
off balance.
18.When cutting a limb that is
under tension, be alert for spring-
back so that you will not be struck
when the tension in the wood
fibers is released.
19.Never cut...

4MM4EN2. Explanation of Symbols on the Machine
For safe operation and
maintenance, symbols are carved in relief on
the machine.
According to these indications, please be
careful not to make any mistake.
The port to refuel “MIX GASO-
LINE”
Position:Fuel cap
The port to top up chain oil
Position:Oil cap
Setting the switch to the “I”
position, the engine starts.
Setting the switch to the “O”
position, the engine stops
immediately.
Position: Front at the top of
the rear handle
Starting the engine. If you...

5EN3. Installing Guide Bar and Saw Chain
A standard saw unit package contains the items
as illustrated.
Open the box and install the guide bar and the
saw chain on the power unit as follows:
The saw chain has very
sharp edges. Use thick protective gloves for
safety.
1. Pull the guard towards the front handle to
check that the chain brake is not engaged.
2. Loosen the nuts and remove the chain cover.
3. Gear the chain to the sprocket and, while fit-
ting the saw chain around the guide bar,
mount the guide...

6MM6EN4. Fuel and Chain Oil
• FUEL
Gasoline is very flamma-
ble. Avoid smoking or bringing any flame or
sparks near fuel. 
Make sure to stop the engine and allow it cool
before refueling the unit. 
Select outdoor bare ground for fueling and
move at least 3 m (10 ft) away from the fuel-
ing point before starting the engine.
•The engines are lubricated by oil specially for-
mulated for air-cooled 2-cycle gasoline engine
use. Use an anti-oxidant added quality oil
expressly labeled for air-cooled 2-cycle...

7EN4. Fuel and Chain Oil
1. Select flat and bare ground for fueling.
2. Move at least 10 feet (3 meters) away from
the fueling point before starting the
engine.
3. Stop the engine before refueling the unit.
At that time, be sure to sufficiently agitate
the mixed gasoline in the container.
•FOR YOUR ENGINE LIFE, AVOID:
1. FUEL WITH NO OIL (RAW GASOLINE) – It will
cause severe damage to the internal engine
parts very quickly.
2. GASOHOL – It can cause deterioration of
rubber and/or plastic parts and...

8MM8EN5. Operating the Engine
It is very dangerous to run
a chainsaw that mounts broken parts or lacks
any parts. Before starting engine, make sure
that all the parts including bar and chain are
installed properly.
•STARTING THE ENGINE
1. Fill fuel and chain oil tanks respectively, and
tighten the caps securely.
2. Set the switch to “I” position.
3. While holding the throttle lever together with
the trigger safety, push in the side latch and
release the throttle lever to leave it at the
starting...

9EN5. 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.
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...