Inspecting And Maintaining The Guide Bar; Inspecting, Maintaining And Sharpening The Saw; Chain - Stihl MSA 120 C Instruction Manual

23 Inspection and Maintenance
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.

23.3 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, @ 14.2.2.
► 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 @ 25.3.
► 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.
0458-716-8221-D
To maintain the guide bar:
► Flip the guide bar after each sharpening and each time the
chain is changed. This will help reduce uneven wear.
There is no "top" or "bottom" of the bar. It may be used in
either orientation, even though the printing on the bar may
be upside down.
1
► Periodically clean the oil inlet hole (1), oil outlet
channel (2) and bar groove (3).
► Periodically remove any metal burrs that develop along
the guide bar with a flat file or a STIHL guide bar dressing
tool.
► Replace the guide bar if the burrs cannot be filed or if the
guide bar becomes damaged.
23.4 Inspecting, Maintaining and Sharpening the
Saw Chain
WARNING
An improperly sharpened chain can increase the risk of
kickback and other reactive forces, resulting in severe
personal injury or death. For example, depth gauges that are
too low or cutters that are filed incorrectly can increase the
kickback tendency of the chain saw and can increase
kickback forces, making it more difficult to control the saw.
Always review and follow the sharpening angles and
dimensions recommended by STIHL when checking or
sharpening the chain.
English
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2
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