Instruction manual
FS 55, FS 55 C, FS 55 R, FS 55 RC
English
11
Warning!
This trimmer / brushcutter is normally to 
be used at ground level with the cutting 
attachment parallel to the ground. Use 
of a trimmer / brushcutter above ground 
level or with the cutting attachment per-
pendicular 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 blade or head for 
cracks, wear and damage.
Warning!
A loose blade or head may vibrate, 
crack, break or come off the trimmer / 
brushcutter, which may result in serious 
or fatal injury. Make sure that the cutting 
attachment is properly tightened. Use 
the wrench supplied or one of sufficient 
length to obtain the proper torque. If the 
blade or head loosens after being prop-
erly tightened, stop work immediately. 
The retaining nut may be worn or dam-
aged and should be replaced. If the 
blade or head continues to loosen, see 
your STIHL dealer. Never use a trimmer 
/ brushcutter with a loose cutting 
attachment.
Warning!
Replace a cracked, damaged or worn-
out head or a cracked, bent, warped, 
damaged, dull or worn out blade imme-
diately, even if damage is limited to 
superficial cracks. Such attachments 
may shatter at high speed and cause 
serious or fatal injury.
Warning!
When using rigid blades, avoid cutting 
close to fences, sides of buildings, tree 
trunks, stones or other such objects that 
could cause the power tool to kick out or 
could cause damage to the blade. 
STIHL recommends use of the nylon 
line heads for such jobs. In addition, be 
alert to an increased possibility of rico-
chets in such situations.
Warning!
If the head, blade or deflector becomes 
clogged or stuck, always shut off the 
engine and make sure the cutting 
attachment has stopped before clean-
ing. Grass, weeds, etc. should be 
cleaned off the blade or from around the 
head at regular intervals.
Warning!
To reduce the risk of unintentional rota-
tion of the cutting attachment and injury, 
always shut off the engine and remove 
the spark plug boot before replacing the 
cutting attachment. To reduce the risk of 
injury, always shut off the engine before 
adjusting the length of the nylon line on 
manually adjustable mowing heads.
Warning!
The gearbox becomes hot during oper-
ation. To reduce the risk of burn injury, 
do not touch the gear housing when it is 
hot.
Warning!
The muffler and other parts of the 
engine (e.g. fins of the cylinder, spark 
plug) become hot during operation and 
remain hot for a while after stopping the 
engine. To reduce risk of burns do not 
touch the muffler and other parts while 
they are hot.
Warning!
To reduce the risk of fire and burn injury, 
keep the area around the muffler clean. 
Remove excess lubricant and all debris 
such as pine needles, branches or 
leaves. Let the engine cool down sitting 
on concrete, metal, bare ground or solid 
wood away from any combustible 
substances.
Warning!
Never modify your muffler. The muffler 
could be damaged and cause an 
increase in heat radiation or sparks, 
thereby increasing the risk of fire and 
burn injury. You may also permanently 
damage the engine. Have your muffler 
serviced and repaired by your STIHL 
servicing dealer only.










