McCulloch CS 340 Operator's Manual page 22

• Make sure that the stop switch works correctly.
• Examine the engine, tank and fuel lines for fuel
leaks.
• Make sure that the saw chain does not rotate when
the engine is idling.
Weekly maintenance
• Make sure that the cooling system works correctly.
• Make sure that the starter, starter cord and return
spring work correctly.
• Make sure that the vibration damping elements are
not damaged.
(Fig. 78)
• File off any burrs from the edges of the guide bar.
• Clean or replace the spark arrestor screen on the
muffler.
(Fig. 79)
• Clean the external surfaces of the carburetor and its
adjacent areas.
• Clean the air filter. Install a new air filter if it is
damaged or too dirty to be fully cleaned. See
clean the air filter on page 22 for more information.
Monthly maintenance
• Examine the brake band on the chain brake for
wear. Replace when the brake band thickness is
less than 0.6 mm (0.024 in) at the most worn point.
(Fig. 80)
• Examine the clutch center, clutch drum and clutch
spring for wear.
• Clean the spark plug. Make sure that the electrode
gap is correct.
(Fig. 81)
• Clean the external surfaces of the carburetor and its
adjacent areas.
• Examine the fuel filter and the fuel hose. Replace if
necessary.
• Empty the fuel tank.
• Empty the oil tank.
• Examine all cables and connections.
Yearly maintenance
• Examine the spark plug.
• Clean the external surfaces of the carburetor and its
adjacent areas.
• Clean the cooling system.
• Examine the spark arrester mesh.
• Examine the fuel filter.
• Examine the fuel hose for damage.
• Examine all cables and connections.
Intermittent maintenance
• Have an approved service center repair or replace
the muffler after 50 hours of operation.
22
• Do maintenance on the spark plug when:
• the power level in the engine is low.
• it is hard to start the engine.
• the engine does not work correctly at idle speed.
• Do a check of the saw chain lubrication each time
you refuel. See
lubrication on page 23 .
To adjust the idle speed
Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
1. Turn the idle adjustment screw, which is identified
with a "T" mark, clockwise until the saw chain starts
to turn.
2. Turn the idle adjustment screw, which is identified
with a "T" mark, counterclockwise until the saw chain
stops.
3. The idle speed must be below the speed when the
saw chain starts to turn. The idle speed is correct
when the engine operates smoothly in all positions.
To
To clean the spark arrester screen
1. Use a wire brush to clean the spark arrester screen.
To do maintenance on the spark plug
1. If the product is hard to start or operate, examine the
spark plug for unwanted materials. To decrease the
risk of unwanted material on the spark plug
electrodes:
a) make sure that the idle speed is correctly
adjusted.
b) make sure that the fuel mixture is correct.
c) make sure that the air filter is clean.
2. Clean the spark plug if it is dirty. Make sure that the
electrode gap is correct. (Fig. 81)
3. Replace the spark plug when it is necessary.
To clean the air filter
1. Remove the air filter cover and remove the air filter.
2. Clean the air filter with warm soap water. Make sure
that the air filter is dry before you install it.
3. Replace the air filter if it is too dirty to fully clean it.
Always replace a damaged air filter.
To do a check of the saw chain
CAUTION: Use the recommended spark
plug. Make sure that the replacement is the
same as the manufacturer supplied part. An
incorrect spark plug can cause damage to
the product.
280 - 007 - 14.10.2019