McCulloch CS 340, Operator'S Manual

Page: 19 / 444

Operation
WARNING: Read and understand the safety
chapter before you operate the product.
To use fuel
CAUTION: This product has a two-cycle
engine. Use a mixture of gasoline and two-
cycle engine oil. Make sure to use the
correct quantity of oil in the mixture.
Incorrect ratio of gasoline and oil can cause
damage to the engine.
Fuel mixture ratio
The fuel mixture ratio for the gasoline and two-cycle
engine oil is 50:1 (2%)
Gasoline Two-cycle engine oil
1 U.S. Gal. 77 ml (2.6 oz)
1 UK Gal. 95 ml (3.2 oz)
5 l 100 ml (3.4 oz)
To make the fuel mixture
1. Determine the correct quantity of gasoline and
engine oil (mixture ratio 50:1). Do not make more
than 30 days quantity of fuel mixture. See To use
fuel on page 19
.
2. Add half of the gasoline quantity to a clean fuel
container with an antispill valve.
CAUTION: Do not use gasoline with
more than 10% ethanol concentration
(E10). This can cause damage to the
product.
CAUTION: Do not use gasoline with an
octane number less than 90 RON (87
AKI). This can cause damage to the
product.
Note: Use gasoline with a higher octane number if
you frequently use the product at continuously high
engine speed.
3. Add the full quantity of the two-cycle engine oil to the
fuel container.
CAUTION: Always use air-cooled two-
cycled engine oil of high quality. Other
oils can cause damage to the product.
4. Shake the fuel mixture to mix the contents.
5. Add the remaining gasoline quantity to the fuel
container.
6. Shake the fuel mixture to mix the contents.
7. Fill the fuel tank of the product with the fuel mixture.
See
To use fuel on page 19
.
To fill the fuel tank
1. Make sure that the fuel mixture is correct and that
the fuel mixture is in a fuel container with an antispill
valve.
2. If fuel is on the container, remove the unwanted fuel
and let the container dry.
3. Make sure that the area near the fuel tank cap is
clean.
4. Remove the fuel tank cap.
5. Shake the fuel container before you add the fuel
mixture to the fuel tank.
6. Put back the fuel tank cap.
To lubricate the saw chain
The product has an automatic lubrication system. The
saw chain oil tank and the fuel tank are designed so that
the fuel runs out before the saw chain oil. This safety
feature requires that the correct chain oil is used and
that the instructions are obeyed.
1. Use vegetable-based saw chain oil or a standard
chain oil.
2. Make sure that the area near the cap of the saw
chain oil tank is clean.
3. Remove the cap of the saw chain oil tank.
4. Fill the saw chain oil tank with the recommended
saw chain oil.
5. Put back the cap of the saw chain oil tank.
To start and stop
Before you start the engine
• Examine the product for missing, damaged, loose or
worn parts.
• Examine the nuts, screws and bolts.
• Examine the air filter.
• Examine the trigger lockout and the trigger for
correct operation.
• Examine the stop switch for correct operation.
• Examine the product for fuel leaks.
• Examine the saw chain sharpness and tension.
To start a cold engine
1. Move the front hand guard forward to engage the
chain brake. (Fig. 55)
2. Pull the choke control out fully. (Fig. 56)
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