Instruction Manual

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2020 0458-546-8621-D. VA8.K20. 0000001050_029_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 performance and
satisfaction from your STIHL trimmer, it
is important that you read, understand
and follow the safety precautions and
the operating and maintenance
instructions in chapter "Safety
Precautions and Working Techniques"
before using your trimmer. For further
information you can go to
www.stihlusa.com.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
WARNING
Because a trimmer is a high-speed
cutting tool some special safety
precautions must be observed to reduce
the risk of personal injury. Careless or
improper use may cause serious or even
fatal injury.
Make sure your unit is equipped with the
proper deflector, handle and harness for
the type of cutting attachment being
used. Always wear proper eye
protection.
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 15
Mounting the Loop Handle 16
Mounting the Deflector 16
Mounting the Cutting Attachment 17
Fuel 20
Fueling 21
Starting / Stopping the Engine 23
Operating Instructions 25
Cleaning the Air Filter 25
Engine Management 26
Adjusting the Carburetor 26
Spark Plug 26
Engine Running Behavior 27
Storing the Machine 28
Maintaining the Mowing Head 28
Inspections and Maintenance by
Dealer 32
Maintenance and Care 33
Main Parts 35
Specifications 36
Maintenance and Repairs 37
Disposal 38
Limited Warranty 38
STIHL Incorporated Federal
Emission Control Warranty
Statement 38
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 40
Trademarks 42