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

24 Inspection and Maintenance
To maintain the guide bar:
► Flip the guide bar after each sharpening and each time the
chain is changed to avoid 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.
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► Periodically clean the oil inlet hole (1), oil outlet
channel (2) and bar groove (3).
► Periodically remove any metal burrs that may 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.
24.4 Inspecting, Maintaining and Sharpening the
Saw Chain
WARNING
An improperly sharpened saw 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 saw chain.
0458-716-8621-C
Never use a dull or damaged saw chain. This leads to
increased physical strain, increased vibration load,
unsatisfactory cutting results and increased wear. If the
chips from cutting are fine, more like saw dust than wood
chips, the chain likely is dull.
► Switch off the chain saw, engage the chain brake and
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► Check the height of the depth gauge (1) with a STIHL file
► If the depth gauge protrudes higher than the file gauge,
► Work carefully. Do not file the depth gauge too low. A
WARNING
remove the battery.
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gauge (2) matching the pitch of the saw chain.
file the depth gauge to the appropriate height.
depth gauge that is too low must be replaced or
sharpened by an authorized STIHL servicing dealer, as it
can increase the kickback tendency of the chain saw and
can increase kickback forces.
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