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

23 Inspection and Maintenance
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.
STIHL recommends using genuine STIHL chain sprockets.
Alternating between two chains helps reduce wear to the
chain sprocket.

23.3 Inspecting and Maintaining the Guide Bar

► Switch off the pole pruner and remove the battery.
► Remove the guide bar and saw chain, @ 14.3.2.
► Measure the depth of the guide bar groove in the area with
the greatest wear using the measuring tool on the file
gauge sold separately.
► Replace the guide bar if the measured depth is less than
the required minimum depths stated in @ 25.3.
0458-813-8221-A
► 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
English
3
2 3
39