► Rotate the shroud fasteners (1) a quarter turn
counterclockwise.
► Remove the shroud (2).
► Pull off the spark plug boot (3).
► If area around the spark plug is dirty: Clean it
with a damp cloth.
► Unscrew the spark plug.
► Clean the spark plug with a damp cloth.
► If the spark plug is corroded: Install a new
spark plug.
► Fit the spark plug and tighten it down firmly.
► Connect the spark plug boot (3) and press it
down firmly.
► Place the shroud (2) in position.
► Rotate the shroud fasteners (1) a quarter turn
clockwise.
The shroud fasteners are locked.
16 Maintenance
16.1 Maintenance intervals
Maintenance intervals depend on the ambient
conditions and the operating conditions. STIHL
recommends the following maintenance inter‐
vals:
Chain brake
► Have a STIHL dealer service the chain broke
in the following intervals:
–
Full-time use: every three months
–
Part-time use: every six months
–
Occasional use: every year
After every 100 hours of operation
► Replace the spark plug.
Weekly
► Check the chain sprocket.
► Check and deburr the guide bar.
► Check and resharpen the saw chain.
Monthly
► Have the oil tank cleaned by a STIHL dealer.
► Have the fuel tank cleaned by a STIHL dealer.
► Have the pickup body in the fuel tank cleaned
by a STIHL dealer.
Annually
► Have the pickup body in the fuel tank replaced
by a STIHL dealer.
16.2 Deburring the Guide Bar
A burr can build up on the outer edge of the
guide bar.
► Remove burr with a flat file or a STIHL guide
bar dressing tool.
► If you have any queries: Contact your STIHL
servicing dealer.
16.3 Sharpening the Saw Chain
Correctly sharpening saw chains requires a lot of
practice.
STIHL recommends you have saw chains
resharpened by a STIHL servicing dealer.
WARNING
■ The chain's cutters are very sharp. There is a
risk of cut injuries.
► Wear work gloves made of durable material.
4
0000-GXX-3488-A0
-
+
-
A
B
C
+
-
+
1 3 22
► Sharpen the right hand cutters (4) with a
STIHL USG universal sharpener using the fol‐
lowing settings:
–
Scale A: + 10°
–
Scale B: 0°
–
Scale C: + 15°
► Sharpen the left hand cutters (1) with a STIHL
USG universal sharpener using the following
settings:
–
Scale A: + 10°
–
Scale B: 0°
–
Scale C: - 15°
English 16 Maintenance
22 0458-787-0121-B. VA0.M20.