Stihl Fs 90 R Manual

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STIHL FS 90
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 - 53
Manual de instrucciones
54 - 111 

Original Instruction Manual Printed on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled. © ANDREAS STIHL AG & Co. KG, 2016
0458-260-8621-D. VA0.L15. 
0000000802_020_GB
FS 90, FS 90 R
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 / 
brushcutter.
To receive maximum...

FS 90, FS 90 R
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 directly to an...

FS 90, FS 90 R
English
3 The terminology utilized in this manual 
when referring to the power tool reflects 
the fact that different types of cutting 
attachments 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). A 
"brushcutter" designates a unit 
equipped with a rigid metal blade. Many 
FS models may be used as either a 
trimmer or a brushcutter –...

FS 90, FS 90 R
English
4 Safe use of a trimmer / brushcutter 
involves
1.the operator
2.the power tool
3.the use of the power tool.
THE OPERATOR
Physical Condition
You must be in good physical condition 
and mental health and not under the 
influence of any substance (drugs, 
alcohol, etc.) which might impair vision, 
dexterity or judgment. Do not operate 
this machine when you are fatigued.
WARNING
Be alert – if you get tired, take a break. 
Tiredness may result in loss of control. 
Working with any...

FS 90, FS 90 R
English
5
WARNING
Be particularly alert and cautious when 
wearing hearing protection because 
your ability to hear warnings (shouts, 
alarms, etc.) is restricted.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...

FS 90, FS 90 R
English
6 It may be carried only in a horizontal 
position. Grip the shaft in a manner that 
the machine is balanced horizontally. 
Keep the hot muffler away from your 
body and the cutting attachment behind 
you.
WARNING
Always shut off the engine and make 
sure the cutting attachment has stopped 
before putting a trimmer / brushcutter 
down. When transporting it in a vehicle, 
properly secure it to prevent turnover, 
fuel spillage and damage to the unit. 
STIHL recommends that you keep...

FS 90, FS 90 R
English
7 Before Starting
WARNING
Always check your power tool for proper 
condition and operation before starting, 
particularly the throttle trigger, throttle 
trigger lockout, slide control / stop 
switch, cutting attachment, deflector and 
harness. The throttle trigger must move 
freely and always spring back to the idle 
position. Never attempt to modify the 
controls or safety devices.
WARNING
Check fuel system for leaks, especially 
the visible parts, e.g., filler cap, hose...

FS 90, FS 90 R
English
8 Arrows on the deflector (A) and limit 
stop (B) (as seen from the underside) 
show the correct direction of rotation of 
the cutting attachment. When viewed 
from above, however, the cutting 
attachment rotates counterclockwise.
Adjust carrying harness and hand grip to 
suit your size before starting work. The 
machine should be properly balanced as 
specified in your instruction manual for 
proper control and less fatigue in 
operation. To be better prepared in case 
of an...