STIHL Fs 40 C Owners Manual

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STIHL FS 40, 50
WARNING
Read Instruction Manual thoroughly 
before use and follow all safety 
precautions – improper use can 
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga 
todas las precauciones de 
seguridad dadas en el manual de 
instrucciones – el uso incorrecto 
puede causar lesiones graves o 
mortales.
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Instruction Manual
1 - 43
Manual de instrucciones
44 - 91 

Original Instruction Manual Printed on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2017
0458-546-8621-D. VA3.A17. 
0000001050_022_GB
FS 40, FS 40 C, FS 50, FS 50 C
English
1
{This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process 
with electronic systems.
Contents
Allow only persons who fully understand 
this manual to operate your trimmer.
To receive maximum...

FS 40, FS 40 C, FS 50, FS 50 C
English
2
Pictograms
The meanings of the pictograms 
attached to or embossed on the 
machine are explained in this manual.
Depending on the model concerned, the 
following pictograms may be on your 
machine.
Symbols in Text
Many operating and safety instructions 
are supported by illustrations.
The individual steps or procedures 
described in the manual may be marked 
in different ways:
NA bullet marks a step or procedure.
A description of a step or procedure that 
refers...

FS 40, FS 40 C, FS 50, FS 50 C
English
3 The terminology utilized in this manual 
when referring to the power tool reflects 
the type of cutting attachments that may 
be mounted on it. The term "trimmer" is 
used to designate an FS unit that is 
equipped with a nylon line head or a 
head with flexible plastic blades (i.e., the 
PolyCut head).
WARNING
As more fully explained later in these 
Safety Precautions, to reduce the risk of 
personal injury, make sure your unit is 
equipped with the proper...

FS 40, FS 40 C, FS 50, FS 50 C
English
4
WARNING
Prolonged use of a power tool (or other 
machines) exposing the operator to 
vibrations may produce whitefinger 
disease (Raynaud's phenomenon) or 
carpal tunnel syndrome.
These conditions reduce the hand's 
ability to feel and regulate temperature, 
produce numbness and burning 
sensations and may cause nerve and 
circulation damage and tissue necrosis.
All factors which contribute to 
whitefinger disease are not known, but 
cold weather, smoking...

FS 40, FS 40 C, FS 50, FS 50 C
English
5 Avoid loose-fitting jackets, scarfs, 
neckties, jewelry, flared or cuffed pants, 
unconfined long hair or anything that 
could become caught on branches, 
brush or the moving parts of the unit. 
Secure hair so it is above shoulder level.
THE POWER TOOL
For illustrations and definitions of the 
power tool parts see the chapter on 
"Main Parts."
WARNING
Never modify this power tool in any way. 
Only attachments supplied by STIHL 
and expressly approved by...

FS 40, FS 40 C, FS 50, FS 50 C
English
6
WARNING
Fueling Instructions
WARNING
To reduce the risk of serious injury from 
burns, never attempt to refuel the unit 
until it has been completely removed 
from the operator.
WARNING
Fuel your power tool in well-ventilated 
areas, outdoors. Always shut off the 
engine and allow it to cool before 
refueling. Gasoline vapor pressure may 
build up inside the fuel tank depending 
on the fuel used, the weather conditions 
and the tank venting system.
In order to...

FS 40, FS 40 C, FS 50, FS 50 C
English
7 NTo return the cap to the open 
position for installation, turn the cap 
(with the grip up) until it drops fully 
into the tank opening. Next, twist the 
cap counterclockwise as far as it will 
go (approx. 1/4 turn) – this will twist 
the base of the cap into the correct 
position. Then, twist the cap 
clockwise, closing it normally.
NIf your cap still does not tighten 
properly, it may be damaged or 
broken; immediately stop use of the 
unit and take it to your...

FS 40, FS 40 C, FS 50, FS 50 C
English
8
WARNING
Keep the deflector (and the attached 
skirt where appropriate) adjusted 
properly at all times (see chapters on 
"Mounting the Deflector" and "Mounting 
the Cutting Attachment" of your 
instruction manual).
Arrows on the deflector (as seen from 
the underside of the deflector) show the 
correct direction of rotation of the cutting 
attachment (counterclockwise). When viewed from above, however, the cutting 
attachment rotates clockwise (see...