Inspecting And Maintaining The Cutting Blades - Stihl HSA 25 Instruction Manual

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22.2 Inspecting and Maintaining the Cutting Blades

WARNING
To reduce the risk of personal injury from unintended
activation, remove the battery before inspecting the cutting
blades or carrying out any maintenance, @ 9. To help
prevent injuries, always wear heavy-duty work gloves when
handling the garden shears or the cutting blades, @ 6.4.
STIHL recommends having the cutting blades sharpened by
an authorized STIHL servicing dealer.
Shrub Blades
Although it is best to have the cutting blades resharpened by
a dealer, it is possible to use a flat, crosscut sharpening file
to sharpen the shrub blades.
Sharpen the shrub blades when cutting performance begins
to deteriorate, i.e., blades frequently snag on branches or
fail to cut material cleanly.
To sharpen the shrub blades with a file:
► Remove the shrub blades from the garden shears,
@ 13.2.
► Sharpen each cutting edge of the upper shrub cutting
blade with a sharpening file. Always file toward the cutting
edge with a forward motion. The file only sharpens on the
forward stroke. Lift off the blade on the backstroke.
► Only sharpen the cutting edges. Do not file blunt
projecting parts of the cutting attachment, or the cutting
blade guard. Make sure your sharpening stroke matches
the sharpening angle, @ 24.2.
28
► Turn the shrub blades over and sharpen the cutting edges
of the lower shrub cutting blade.
► Use a whetstone to remove any burrs from the cutting
edges. Remove as little material as possible.
► After sharpening, wipe away filing or grinding dust with a
dry or slightly dampened cloth and then spray the cutting
blades with a resin solvent, such as STIHL Resin
Remover and Lubricant.
If you make a warranty claim for a component which has not
been serviced or maintained properly, coverage may be
denied.
Grass Blades
The grass blades cannot be sharpened by the operator.
► Have the grass blades sharpened by an authorized STIHL
servicing dealer.
NOTICE
Operating the machine with dull or damaged cutting blades
may overload the motor. Keeping the cutting blades sharp
helps maintain cutting performance and the expected life of
the product.
22 Inspection and Maintenance
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