Reactive Forces; Working Techniques - Stihl FSA 90 R Instruction Manual

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Reactive Forces

Risk of Kickout (Blade Thrust) with Metal
Cutting Attachments
WARNING
When using metal cut-
ting attachments there is
a risk of kickout when the
rotating blade comes into
contact with a solid object
such as a tree trunk,
branch, tree stump, rock
or similar. The machine is
thrown to the right or to
the rear – opposite to the
attachment's direction of
rotation.
The risk of kickout is greatest when the
black area of the rotating cutting
attachment comes into contact with a
solid object.
8

Working Techniques

Mowing Head with Nylon Line
Nylon line mowing heads are suitable for
lawn edging and trimming small to
medium areas and around obstacles.
The working technique is described
below, see "Mowing".
The mowing head comes with an
instruction leaflet. Refill the mowing
head with nylon line as described in the
instruction leaflet.
Working with Bump Guard
The bump guard is available as a special
accessory.
1
The bump guard (1)
limits the cutting range of the
–
mowing line
reduces the risk of the rotating
–
mowing line causing damage (e.g.
tree bark)
WARNING
The mowing head may continue to
rotate briefly after you switch off your
power tool – wait for the mowing head to
come to a standstill before adjusting the
bump guard – do not adjust it with your
foot.
Grass Cutting Blade
Grass cutting blades are suitable for
cutting tough grass, weeds. fern,
stinging nettles and reed. They are
robust and can be used for mowing large
areas. The working technique is
described below, see "Mowing".
WARNING
Improper use may damage the grass
cutting blade – risk of injury from thrown
parts.
Resharpen the grass cutting blade
according to instructions when it has
dulled noticeably.
FSA 90 R