Husqvarna 120 Mark II Operator's Manual page 18

• Examine the drive sprocket for excessive
wear and replace if necessary.
(Fig. 68)
• Clean the air intake of the starter unit.
• Make sure that the nuts and screws are
tight.
• 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. 69)
• File off any burrs from the edges of the
guide bar.
• Clean or replace the spark arrestor screen
on the muffler.
(Fig. 70)
• 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.
To clean the air filter on page 19 for
See
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. 71)
• Examine the clutch center, clutch drum and
clutch spring for wear.
• Clean the spark plug. Make sure that the
electrode gap is correct.
(Fig. 72)
• Clean the external surfaces of the
carburetor and its adjacent areas.
18
• 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.
• 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
the saw chain lubrication on page 20 .
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 clean the spark arrester screen
1. Use a wire brush to clean the spark
arrester screen.
To do a check of
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