Stihl FS 251 R Notice D'emploi page 16

English
■ Many factors influence the occurrence and
force of the kickout reaction. These include
cutting attachment speed, the speed at which
the cutting attachment contacts the object, the
location and angle of contact, the condition of
the cutting attachment, and how quickly the
cutting attachment is slowed, snagged or stop‐
ped, among other factors.
► Use caution when working with the shaded
areas of any metal cutting attachment.
■ To reduce the risk of personal injury from kick‐
out and blade thrust when using a rigid cutting
attachment:
► Avoid cutting close to fences, sides of build‐
ings, tree trunks or other such objects when
a metal cutting blade is mounted. STIHL
recommends using a nylon line head for
such jobs.
► Keep metal cutting attachments sharp.
► Keep bystanders at least 50 ft. (15 m) away
from the work area.
5.8.2 Using a Mowing Head
► When working, sweep the trimmer in a control‐
led manner, parallel to the ground in front of
you.
Mowing heads are to be used only on units
equipped with a line-limiting blade in the deflec‐
tor in order to keep the line at the proper length.
When trimming along a fence, wall or around
trees, it is preferable to use a mowing head with
nylon line to reduce the risk of blade thrust or
kickout, damage to the cutting attachment, and
to reduce damage to the fence, wall or trees.
Using the unit with an overly long nylon cutting
line increases the load on the engine and
reduces its operating speed. This causes the
clutch to slip continuously and results in over‐
heating and damage to important components
(e.g. clutch, polymer housing components). Such
damage could, among other things, cause the
cutting attachment to rotate at idle. Do not use
with mowing line longer than the recommended
length. With a properly mounted deflector, the
16
5 IMPORTANT SAFETY INSTRUCTIONS
built-in line limiting blade will automatically adjust
the line to its proper length.
WARNING
■ To reduce the risk of serious injury:
► Never use wire or metal-reinforced line or
other material in place of the recommended
nylon cutting line. Pieces of wire could
break off and be thrown at high speed
toward the operator or bystanders.
■ A cracked, damaged or worn out mowing head
may shatter at high speeds and cause serious
or fatal injury.
► Have a cracked, damaged or worn out
mowing head replaced immediately, even if
damage appears to be limited to superficial
cracks.
■ When working close to fences, sides of build‐
ings, tree trunks of other such objects, be alert
to an increased possibility of ricochets.
► Take care to clear area of all objects
and debris before trimming along
fences or walls, near tree trunks or
other objects that could increase the
possibility of injury from the ricochet
of thrown objects.
5.8.3 Using a Grass Cutting Blade
► When working with a grass cutting blade,
sweep the trimmer in a controlled manner,
parallel to the ground in front of you. To
reduce the risk of kickout, use the left side
of the cutting blade.
All kinds of grass and weeds can be cut with a
grass cutting blade.
– The 4-tooth grass cutting blade is intended
to cut grass and weeds. It has 4 cutting kni‐
ves with cutting edges on both sides, i.e.,
front and rear. When the cutting edges on
one side become dull, the blade can be
turned over to utilize the cutting edges on
the other side before it is resharpened.
– The 8-tooth grass cutting blade is recom‐
mended for cutting fern or similar fleshy
vegetation. When the cutting edges on one
side become dull, the cutting edges have to
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