STIHL Fs 40 C Owners Manual

FS 40, FS 40 C, FS 50, FS 50 C
English
9 If you cannot set the correct idle speed, 
have your STIHL dealer check your 
power tool and make proper 
adjustments and repairs.
WARNING
This unit is equipped with an ignition 
system that is normally in operational 
readiness. After the stop switch is used 
to stop the engine, it automatically 
springs back to the "on" position in order 
to allow easier restarting. If the engine is 
warm, it may be possible to start it by 
simply pulling the starter...

FS 40, FS 40 C, FS 50, FS 50 C
English
10 where possible. Use good work 
practices, such as operating the unit so 
that the wind or operating process 
directs any dust raised by the power tool 
away from the operator. Follow the 
recommendations of 
EPA/OSHA/NIOSH and occupational 
and trade associations with respect to 
dust ("particulate matter"). When the 
inhalation of dust cannot be 
substantially controlled, i.e., kept at or 
near the ambient (background) level, the 
operator and any...

FS 40, FS 40 C, FS 50, FS 50 C
English
11
WARNING
To reduce the risk of unintentional 
rotation of the cutting attachment and 
injury, always shut off the engine and 
remove the spark plug boot before 
replacing the cutting attachment. To 
reduce the risk of injury, always shut off 
the engine before adjusting the length of 
the nylon line on manually adjustable 
mowing heads.
WARNING
The gearbox becomes hot during 
operation. To reduce the risk of burn 
injury, do not touch the gear housing 
when it is...

FS 40, FS 40 C, FS 50, FS 50 C
English
12 Mowing heads are to be used only on 
trimmers equipped with a line-limiting 
blade in the deflector in order to keep the 
line at the proper length (see "Main 
Parts" chapter in your instruction 
manual).
If the lawn edges are planted with trees 
or bordered by a fence etc., it is best to 
use a nylon line head. It achieves a 
"softer" cut with less risk of damaging 
tree bark etc. than polymer blades.
However, the polymer-bladed STIHL 
PolyCut...

FS 40, FS 40 C, FS 50, FS 50 C
English
13
WARNING
Always stop the engine and make sure 
that the cutting attachment is stopped 
before doing any maintenance or repair 
work or cleaning the power tool. Do not 
attempt any maintenance or repair work 
not described in your instruction manual. 
Have such work performed by your 
STIHL servicing dealer only.
WARNING
Use the specified spark plug, and make 
sure it and the ignition lead are always 
clean and in good condition. Always 
press the spark plug boot...

FS 40, FS 40 C, FS 50, FS 50 C
English
14
Approved Combinations
The complete combination includes:
–Cutting attachment
–Deflector
–Handle
–Shoulder strap (special accessory)
Select correct combination from the 
table according to the cutting 
attachment you intend to use.
WARNING
For safety reasons no other 
combinations are permitted – risk of 
accidents.
Cutting Attachments
Mowing heads
1STIHL AutoCut C 5-2
2STIHL AutoCut 5-23STIHL AutoCut C 6-2
4STIHL DuroCut 5-2
5STIHL PolyCut 6-3
Deflector...

FS 40, FS 40 C, FS 50, FS 50 C
English
15 Your new power tool comes with the 
loop handle mounted on the drive tube, 
but it must be turned and lined up to suit 
your requirements.
Adjusting the loop handle
Versions with screw (FS 40)
NUse a screwdriver or the 
combination wrench to loosen the 
screw (1) on the handle.
Versions with star knob (FS 50)
NLoosen the star knob (2) on the 
handle.
All versions
NTurn the handle to the vertical 
position.The loop handle can be adjusted to suit 
the height and...

FS 40, FS 40 C, FS 50, FS 50 C
English
16
Placing power tool on the ground
NSwitch off the engine.
NLay your trimmer on its back with 
the loop handle and shroud pointing 
down and the output shaft facing up.
Thrust Plate
The thrust plate (1) is shipped with the 
DuroCut 5-2 and PolyCut 6-3. It is only 
required for these mowing heads.
STIHL AutoCut 5-2 mowing head, 
STIHL AutoCut C 5-2 mowing head
NPull the thrust plate (1), if fitted, off 
the shaft (2).
STIHL PolyCut 5-2 mowing head, 
STIHL FixCut 6-3...

FS 40, FS 40 C, FS 50, FS 50 C
English
17 NScrew the mowing head 
counterclockwise on to the shaft (1) 
as far as stop.
NBlock the shaft.
NTighten down the mowing head 
firmly.
NOTICE
Remove the tool used to block the shaft.
Removing the Mowing Head
NBlock the shaft.
NUnscrew the mowing head 
clockwise.
Fitting Mowing Head without Screw 
Mounting
Keep the instruction leaflet for the 
mowing head in a safe place.STIHL AutoCut 5-2
NFit the spring (1) in the mowing 
head (2).
NWind the mowing line  (3) on...

FS 40, FS 40 C, FS 50, FS 50 C
English
18 STIHL AutoCut C 5-2
NSlip the mowing head (2) on to the 
shaft – as AutoCut 5-2.
NTurn the spool (9) clockwise until 
the two arrow heads line up – 
secure the spool in this position.
NInsert the cap (8) in the spool, press 
it down as far as stop and turn it 
clockwise at the same time.
NTurn the cap until you feel 
resistance and then tighten it down 
firmly by hand.STIHL PolyCut 6-3
NFit the thrust plate on the shaft.
NInsert the nut (10) in the mowing 
head....