Inspecting And Maintaining The Chain Sprocket; Inspecting And Maintaining The Guide Bar - Stihl MSA 161 T Instruction Manual

24 Inspection and Maintenance
Proper maintenance of the chain saw includes the following
activities:
► Inspecting the chain sprocket periodically and having a
worn chain sprocket replaced by an authorized STIHL
servicing dealer.
► Inspecting the guide bar for proper groove depth and
spread and replacing the guide bar it if it shows signs of
excessive wear or damage.
► Periodically sharpening the chain, maintaining the depth
limiting guides at the appropriate height and replacing the
saw chain when indicated by the relevant wear marks or
when the chain is damaged or shows signs of excessive
wear.
► Having worn, missing or damaged safety labels replaced
by an authorized STIHL servicing dealer.
If you make a warranty claim for a component which has not
been serviced or maintained properly, coverage may be
denied.

24.2 Inspecting and Maintaining the Chain Sprocket

► Switch off the chain saw, engage the chain brake and
remove the battery.
► Disengage the chain brake, @ 16.2.
► Remove the chain sprocket cover, saw chain and guide
bar.
a
► Check the chain sprocket cover for wear marks.
► If the wear marks are deeper than a = 0.020 in. (0.5 mm),
have the chain sprocket replaced.
0458-791-8621-C
STIHL recommends using genuine STIHL chain sprockets to
ensure optimal functioning of the chain brake.
Alternating between two chains helps reduce wear to the
chain sprocket.

24.3 Inspecting and Maintaining the Guide Bar

► Switch off the chain saw, engage the chain brake and
remove the battery.
► Remove the guide bar and saw chain, @ 15.2.2.
► Measure the depth of the guide bar groove in the area with
the greatest wear using the measuring tool on the file
gauge (special accessory, not included).
► Replace the guide bar if the measured depth is less than
the required minimum depths stated in @ 26.3.
► Check the spread of the guide bar groove with the
measuring tool on the file gauge.
► Replace the guide bar if the groove is narrowed, spread or
shows other signs of substantial wear or damage.
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