STIHL Fs 50 C Manual

FS 40, FS 40 C, FS 50, FS 50 C
English
9 Important Adjustments
If you cannot set the correct idle speed, 
have your STIHL dealer check your 
power tool and make proper 
adjustments and repairs.During Operation
Holding and Controlling the Power Tool
Always hold the unit firmly with both 
hands on the handles while you are 
working. Wrap your fingers and thumbs 
around the handles, keeping the 
handles cradled between your thumb 
and forefinger. Keep your hands in this 
position to have your power tool...

FS 40, FS 40 C, FS 50, FS 50 C
English
10Operating Instructions
In the event of an emergency, switch off 
the engine immediately – move the slide 
control / momentary stop switch to 0 or 
STOP.To reduce the risk of eye and other injury 
always wear proper eye protection (see 
the chapter on "Proper Clothing") and 
ensure that bystanders are at least 
50 feet (15 m) away. To reduce the risk 
of damage to property, also maintain this 
distance from such objects as vehicles 
or windows. Any...

FS 40, FS 40 C, FS 50, FS 50 C
English
11 Your muffler is furnished with a spark 
arresting screen designed to reduce the 
risk of fire from the emission of hot 
particles. Never operate your unit with a 
missing or damaged spark arresting 
screen. If your gas/oil mix ratio is correct  Warning!
This trimmer is normally to be used at 
ground level with the cutting attachment 
parallel to the ground. Use of a trimmer 
above ground level or with the cutting 
attachment perpendicular to the ground 
may...

FS 40, FS 40 C, FS 50, FS 50 C
English
12 (i.e., not too rich), this screen will 
normally stay clean as a result of the 
heat from the muffler and need no 
service or maintenance. If you 
experience loss of performance and you 
suspect a clogged screen, have your 
muffler maintained by a STIHL servicing 
dealer. Some state or federal laws or 
regulations may require a properly 
maintained spark arrestor for certain 
uses. See the "Maintenance, Repair and 
Storing" section of these Safety...

FS 40, FS 40 C, FS 50, FS 50 C
English
13 Do not continue using the PolyCut if one 
of the circular holes (1; arrow) becomes 
visible or if the projecting rim (2; arrow) 
has worn away. Install a new mowing 
head.
STIHL FixCut mowing head
Uses pre-cut lengths of nylon line.
Observe wear indicators.Do not continue using the mowing head 
if the raised moldings (1) on the base 
are missing or worn – see right 
illustration above. The mowing head 
may otherwise shatter and flying objects 
could result in...

FS 40, FS 40 C, FS 50, FS 50 C
English
14 In California, it is a violation of § 4442 or 
§ 4443 or the Public Resources Code to 
use or operate gasoline-powered tools 
on forest-covered, brush-covered or 
grass-covered land unless the engine’s 
exhaust system is equipped with a 
complying spark arrester that is 
maintained in effective working order. 
The owner/operator of this product is 
responsible for properly maintaining the 
spark arrester. Other states or 
governmental entities/agencies, such as...

FS 40, FS 40 C, FS 50, FS 50 C
English
15
Approved Combinations
The complete combination includes:
–Cutting attachment
–Deflector
–Handle
–Shoulder strap (special accessory 
only)
Select correct combination from the 
table according to the cutting 
attachment you intend to use. Read the 
table horizontally from left to right.
Cutting Attachments
Mowing heads
1STIHL AutoCut C 5-2
2STIHL AutoCut 5-2
3STIHL PolyCut 6-3
4STIHL FixCut 5-2Only mowing heads (1, 2, 3, 4) may be 
used on trimmers with a curved...

FS 40, FS 40 C, FS 50, FS 50 C
English
16 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
17
Preparations
NLay your trimmer on sits back with 
the loop handle and shroud pointing 
down and the output shaft facing up.
Thrust Plate
The thrust plate is shipped with the 
PolyCut 6-3 and FixCut 5-2. 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.
STIHL PolyCut 6-3 mowing head, 
STIHL FixCut 5-2 mowing head
NSlip the thrust plate (1) over the...

FS 40, FS 40 C, FS 50, FS 50 C
English
18 NSlip the mowing head (2) over the 
shaft (5) and engage hex recess (7) 
on the external hexagon (6).
NFit the cap (8) on the mowing head 
– screw it clockwise on to the shaft 
as far as stop and tighten it down 
firmly.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...