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► 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 sold sepa‐
rately.
► Replace the guide bar if the measured depth
is less than the required minimum depths sta‐
ted 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 nar‐
rowed, spread or shows other signs of sub‐
stantial wear or damage.
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 "bot‐
tom" of the bar. It may be used in either orien‐
tation, even though the printing on the bar may
be upside down.
1
► Clean the oil outlet duct (1), oil inlet bore (2)
and groove (3) with a brush, a slightly damp‐
ened cloth or resin solvent, such as STIHL
Resin Remover & Lubricant. Do not use deter‐
gents.
► 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.
36
3
2
3
23 Inspection and Maintenance
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.
WARNING
■ Never use a dull or damaged chain. This leads
to increased physical strain, increased vibra‐
tion 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 remove the battery.
2
► Check the height of the depth gauge (1) with a
STIHL file gauge (2) matching the pitch of the
chain.
► If the depth gauge protrudes higher than the
file gauge, file the depth gauge to the appro‐
priate height.
► Work carefully. Do not file the depth gauge too
low. A 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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0458-022-8201-A
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