STIHL Fs 40 C Owners Manual

FS 40, FS 40 C, FS 50, FS 50 C
English
29 NHold the mowing head steady and 
rotate the cap (1) counterclockwise 
until it can be removed.
NPull the spool (2) out of the mowing 
head (3) and remove the remaining 
line.Assembling the mowing head
NFit the empty spool in the mowing 
head.
If the spring (4) has popped out:
Npush it into the spool (2) until it 
engages in position with an audible 
click.
NMount the mowing head – see 
"Mounting the Mowing Head".Winding line onto spool
NUse green-coded...

FS 40, FS 40 C, FS 50, FS 50 C
English
30 NHold the mowing head steady.
NRotate the spool counterclockwise 
until the shortest line is about 10 cm 
(4 in).
NIf necessary, cut the longer line to a 
length of about 10 cm (4 in).
The mowing head is now full.
STIHL AutoCut 5-2
Removing remaining nylon line
NOpen the mowing head – hold it 
steady with one hand and turn the 
cap (1) counterclockwise.
NDisengage the spool (2), take it out 
of the mowing head and remove the 
remaining line.
Winding line onto...

FS 40, FS 40 C, FS 50, FS 50 C
English
31 NStraighten out the nylon lines and 
wind them tightly on to the spool – 
one nylon line in each chamber.
NEngage the ends of the lines in the 
notches (2).
Assembling the mowing head
NOTICE
Check that the spring is installed (see 
"Mounting the Mowing Head").NThread the ends of the lines (6) 
through the sleeves (7) and push 
the spool (2) into the head so that it 
snaps into position.
The nylon lines must disengage from the 
notches (5) as the spool is...

FS 40, FS 40 C, FS 50, FS 50 C
English
32
Spark arresting screen in muffler
NIf the engine is down on power, 
check the spark arresting screen in 
the muffler.
STIHL recommends that you have 
servicing and repair work carried out 
exclusively by an authorized STIHL 
servicing dealer.
Inspections and Maintenance 
by Dealer 

FS 40, FS 40 C, FS 50, FS 50 C
English
33
Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.), 
shorten the specified intervals accordingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
as required
Complete machineVisual inspection (condition, leaks)XX
CleanX
Control handle Check...

FS 40, FS 40 C, FS 50, FS 50 C
English
34
Cutting attachmentVisual inspectionXX
ReplaceX
Check tightnessXX
Safety labels ReplaceX
1)STIHL recommends an authorized STIHL servicing dealer. The following intervals apply to normal operating conditions only. If your daily work-
ing time is longer or operating conditions are difficult (very dusty work area, etc.), 
shorten the specified intervals accordingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12...

FS 40, FS 40 C, FS 50, FS 50 C
English
35 1Loop Handle
2Carrying Ring
3Stop Switch
4Throttle Trigger Lockout
5Throttle Trigger
6Carburetor Adjusting Screws
7Choke Lever
8Air Filter Cover
9Spark Plug Boot
10Machine Support
11Manual Fuel Pump
12Fuel Filler Cap
13Fuel Tank
14Starter Grip
15Muffler with Spark Arresting Screen
16Mowing Head
17Line Lmiting Blade
18Deflector
19Drive Tube
#Serial Number
Main Parts
14
19
18
17
16
1513
12
11
87
6
1
234
510#
546BA015 KN
9 

FS 40, FS 40 C, FS 50, FS 50 C
English
36
Definitions
1 Loop Handle
For easy control of machine during 
cutting work.
2 Carrying Ring
Connects the unit to the harness.
3 Stop Switch
Switches the engine's ignition off 
and stops the engine. 
4 Throttle Trigger Lockout
Must be depressed before the 
throttle trigger can be activated.
5 Throttle Trigger
Controls the speed of the engine.
6 Carburetor Adjusting Screws
For tuning the carburetor.
7 Choke Lever
Eases engine starting by enriching 
mixture.
8...

FS 40, FS 40 C, FS 50, FS 50 C
English
37 FS 50, FS 50 C
Ignition System
Electronic magneto ignition
Fuel System
All position diaphragm carburetor with 
integral fuel pump
Weight
Dry, without cutting attachment and 
deflector
Overall length
without cutting attachmentUsers of this unit should carry out only 
the maintenance operations described 
in this manual. STIHL recommends that 
other repair work be performed only by 
authorized STIHL servicing dealers 
using genuine STIHL replacement parts.
Genuine...

FS 40, FS 40 C, FS 50, FS 50 C
English
38 Observe all country-specific waste 
disposal rules and regulations.
STIHL products must not be thrown in 
the garbage can. Take the product, 
accessories and packaging to an 
approved disposal site for environment-
friendly recycling.
Contact your STIHL servicing dealer for 
the latest information on waste disposal.STIHL Incorporated Limited Warranty 
Policy
This product is sold subject to the STIHL 
Incorporated Limited Warranty Policy, 
available at...