Inspecting, Maintaining And Sharpening The Saw; Chain - Stihl HTA 50.0 Instruction Manual

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► 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.
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
► Clean the oil outlet duct (1), oil inlet bore (2) and groove
(3) with a brush, a slightly dampened cloth or resin
solvent, such as STIHL Resin Remover & Lubricant. Do
not use detergents.
► 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
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3
2 3
kickback tendency of the pole pruner and can increase
kickback forces, making it more difficult to control the pole
pruner. 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 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 pole pruner 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 appropriate height.
► Work carefully. Filing the depth gauges too low will
increase reactive forces. If the depth gauges have been
filed too low, have the chain sharpened or replaced by an
authorized STIHL dealer.
23 Inspection and Maintenance
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0458-813-8621-A