FS 40, FS 40 C, FS 50, FS 50 C
English
28
For periods of about 3 months or longer
N Drain and clean the fuel tank in a 
well ventilated area.
N Dispose of fuel properly in 
accordance with local 
environmental requirements.
N Run the engine until the carburetor 
is dry – this helps prevent the 
carburetor diaphragms sticking 
together.
N Remove, clean and inspect the 
cutting attachment. Coat metal 
cutting attachments with corrosion 
inhibitor.
N Thoroughly clean the machine – pay 
special attention to the cylinder fins 
and air filter.
N Store the machine in a dry and 
secure location – out of the reach of 
children and other unauthorized 
persons.
Placing power tool on the ground
N Switch off the engine.
N Lay your trimmer on its back with 
the loop handle and shroud pointing 
down and the output shaft facing up.
Replacing Nylon Line
Always check the mowing head for signs 
of wear before replacing the nylon line.
WARNING
If there are signs of serious wear, 
replace the complete mowing head.
The nylon mowing line is referred to as 
"nylon line" or "line" in the following.
The mowing head is supplied with 
illustrated instructions for replacing the 
nylon line. Keep the instructions for the 
mowing head in a safe place.
N If necessary, remove the mowing 
head.
Adjusting Nylon Line
STIHL AutoCut
N Hold the rotating mowing head 
above the ground – tap it on the 
ground once – about 3 cm (1.2 in) of 
fresh line is advanced.
N The blade (1) on the deflector (2) 
trims surplus line to the correct 
length – avoid tapping the mowing 
head more than once at a time.
Line feed operates only if both lines still 
have a minimum length of 2.5 cm (1 in).
If the line is shorter than 2.5 cm (1 in):
WARNING
To reduce the risk of injury, always shut 
off the engine before adjusting the 
mowing line by hand.
Storing the Machine Maintaining the Mowing 
Head