FS 45, FS 46
English
10
Operating Instructions
In the event of an emergency, shut off 
the engine immediately – move the slide 
control / stop switch to 0 or STOP.
To reduce the risk of eye and other injury 
always wear proper eye protection (see 
the chapter on "Proper Clothing") and 
ensure that bystanders are at least 
50 feet (15 m) away. To reduce the risk 
of damage to property, also maintain this 
distance from such objects as vehicles 
or windows. Any coworkers who must be 
in the restricted area should also wear 
goggles or protective glasses.
Stop the engine and cutting tool 
immediately if you are approached.
Warning!
Inhalation of certain dusts, especially 
organic dusts such as mold or pollen, 
can cause susceptible persons to have 
an allergic or asthmatic reaction. Sub-
stantial or repeated inhalation of dust 
and other airborne contaminants, in par-
ticular those with a smaller particle size, 
may cause respiratory or other ill-
nesses. Control dust at the source 
where possible. Use good work prac-
tices, such as operating the unit so that 
the wind or operating process directs 
any dust raised by the power tool away 
from the operator. Follow the recom-
mendations of EPA / OSHA / NIOSH 
and occupational and trade associa-
tions with respect to dust ("particulate 
matter".) When the inhalation of dust 
cannot be substantially controlled, i.e., 
kept at or near the ambient (back-
ground) level, the operator and any 
bystanders should wear a respirator 
approved by NIOSH / MSHA for the type 
of dust encountered.
Warning!
Do not operate your power tool using 
the starting throttle lock, as you do not 
have control of the engine speed.
Warning!
The rotating cutting attachment may 
fling foreign objects directly or by rico-
chet a great distance.
Never use metal 
blades on this trim-
mer. Only mowing 
heads are 
authorized.
Warning!
Before you start work, 
examine the area for 
stones, glass, fence wire, 
metal, trash or other solid 
objects. The cutting 
attachment could throw 
objects of this kind.
Warning!
This trimmer is normally to be used at 
ground level with the cutting attachment 
parallel to the ground. Use of a trimmer 
above ground level or with the cutting 
attachment perpendicular to the ground 
may increase the risk of injury, since the 
cutting attachment is more fully exposed 
and the power tool may be more difficult 
to control.
Warning!
During cutting, check the tightness and 
the condition of the cutting attachment 
at regular short intervals with the engine 
and attachment stopped. If the behavior 
of the attachment changes during use, 
stop the engine immediately, wait until 
the cutting attachment stops, and check 
the nut securing the attachment for 
tightness and the head for cracks, wear 
and damage.
Warning!
A loose head may vibrate, crack, break 
or come off the trimmer, which may 
result in serious or fatal injury. Make 
sure that the cutting attachment is prop-
erly tightened. Use the wrench supplied 
or one of sufficient length to obtain the 
proper torque. If the head loosens after 
being properly tightened, stop work 
immediately. The retaining nut may be 
worn or damaged and should be 
replaced. If the head continues to 
loosen, see your STIHL dealer. Never 
use a trimmer with a loose cutting 
attachment.