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Husqvarna 120 Mark II Manual

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Maintenance
WARNING: Read and understand the safety
chapter before you clean, repair or do
maintenance on the product.
Maintenance schedule
Make sure that you obey the maintenance schedule.
The intervals are calculated from daily use of the
product. The intervals are different if you do not use the
product each day. Only do the maintenance work that is
found in this manual. Speak to an approved service
center about other maintenance work not found in this
manual.
Daily maintenance
• Clean the external surfaces.
• Make sure that the lockout and trigger work
correctly.
• Clean the chain brake and make sure that it works
correctly.
(Fig. 64)
• Examine the chain catcher for damage. Replace the
chain catcher if it is damaged.
(Fig. 65)
• Turn the guide bar daily for more even wear.
• Make sure that the lubrication hole in the guide bar is
not clogged.
(Fig. 66)
• Clean the guide bar groove.
(Fig. 67)
• Make sure that the guide bar and saw chain get
sufficient oil.
• Examine the saw chain:
• for cracks in the rivets and links.
• for abnormally worn rivets and links.
• for correct tension.
If necessary, replace the saw chain.
• Sharpen the saw chain. See
To sharpen the saw
chain on page 20
.
• 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. See
To
clean the air filter on page 20
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. 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.
• 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.
658 - 009 - 05.05.2020
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