Stihl Fs 45 C Manual

							FS 45, FS 46
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 nylon line with a 
diameter of 0.08 in (2.0 mm).
NCut two 6ft 6in (2 m) lengths of 
nylon line from the reel (special 
accessory).
NRotate the spool (2) 
counterclockwise until the two arrow 
points are in alignment.
NPush the straight end of each line 
through one sleeve (5) in the 
mowing head (3) until you feel a 
noticeable resistance – and then 
continue pushing as far as stop.
Schnur/LINE  1
681BA021 KN
1
2
3
Schnur/LINE  1
681BA022 KN
24
Schnur/LINE  2
681BA023 KN
5
Schnur/LINE  13
32 
						

							FS 45, FS 46
English
30 NHold the mowing head steady.
NRotate the spool counterclockwise 
until the shortest line is about 4 in 
(10 cm).
NIf necessary, cut the longer line to a 
length of about 4 in (10 cm).
The mowing head is now full.
STIHL AutoCut 5-2
Always check the mowing head for signs 
of wear before replacing the nylon line.
If there are signs of serious wear, 
replace the parts concerned or install a 
new mowing head.Preparations
NShut off the engine.
NPut the machine on the ground with 
the mowing head facing up.
Removing remaining nylon line
NOpen the mowing head – hold it 
steady with one hand.
NTurn the cap (1) counterclockwise.
NDisengage the spool (2), take it out 
of the mowing head and remove the 
remaining line.
Winding line onto spool
A prewound spool (special accessory) 
may be used as an alternative to the 
following procedure.NUse green-coded nylon line with a 
diameter of 0.08 in (2.0 mm).
NCut two 10ft (3 m) lengths of nylon 
line from the reel (special 
accessory).
NInsert the ends of each line (3) in the 
holes (4) in the spool.
NBend the ends of the lines over the 
edge of the holes to form a hook.
681BA024 KN
Schnur/LINE  2
Schnur/LINE  1
681BA008 KN
1
2
681BA009 KN
4
3
3 
						

							FS 45, FS 46
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
Check that the compression 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 pushed into 
position.
NPull out the ends of the lines as far 
as stop.
NMount the mowing head on the 
machine.
Maintenance Work
STIHL recommends that you have 
servicing and repair work carried out 
exclusively by an authorized STIHL 
servicing dealer.
Fuel Pickup Body in Tank
NHave the pickup body in the fuel 
tank replaced every year.
Spark Arrestor in Muffler
NIf the engine is low on power, have 
your dealer check the spark arrestor 
(country-specific option) in the 
muffler. 681BA010 KN
5
5
7
681BA011 KN
2
6
6
,QVSHFWLRQVDQG0DLQWHQDQFH
E\HDOHU 
						

							FS 45, FS 46
English
32
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
if required
Complete machineVisual inspection (condition, leaks)XX
CleanX
Control handle Check operationXX
Air filterCleanXX
ReplaceX
Pickup body in fuel tankHave checked by dealer
1)X
Have replaced by dealer
1)XXX
Fuel tank CleanXX
CarburetorCheck idle adjustment – the cutting 
attachment must not turnXX
Readjust idleX
Spark plugReadjust electrode gapX
Replace after every 100 operating hours
Cooling inletsVisual InspectionX
CleanX
Spark arresting screen
2) in mufflerHave checked by dealer
1)XX
Have cleaned or replaced by servicing 
dealer
1)XX
All accessible screws and nuts (not adjust-
ing screws)RetightenX 
						

							FS 45, FS 46
English
33
Cutting AttachmentVisual InspectionXX
ReplaceX
Check tightnessXX
Safety labels ReplaceX
1)STIHL recommends a STIHL servicing dealer.2)not in all versions, market-specific 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
if required 
						

							FS 45, FS 46
English
341Loop Handle
2Spacer
3Stop Switch
4Throttle Trigger Lockout
5Throttle Trigger
6Choke Lever
7Air Filter Cover
8Fuel Filler Cap
9Fuel Tank
10Machine Support
11Fuel Pump
12Carburetor Adjusting Screws
13Starter Grip
14Spark Plug Boot
15Muffler with Spark Arresting Screen
16Line Limiting Blade
17Deflector
18Mowing Head
19Drive Tube
#Serial Number
Main Parts
1311
12
2
8
6
5
43
1
7
9
10#
15
14
16
17
18
19
232BA076 KN 
						

							FS 45, FS 46
English
35
Definitions
1 Loop Handle
For easy control of machine during 
cutting work.
2 Spacer
Maintains minimum clearance 
between loop handle and control 
handle.
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 Choke Lever
Eases engine starting by enriching 
mixture.
7 Air Filter Cover
Covers and protects the air filter 
element.
8 Fuel Filler Cap
For closing the fuel tank.
9 Fuel Tank
For fuel and oil mixture.
10 Machine Support
For resting machine on the ground.
11 Fuel Pump
Provides additional fuel feed for a 
cold start.
12 Carburetor Adjusting Screws
For tuning the carburetor.13 Starter Grip
The grip of the pull starter, for 
starting the engine.
14 Spark Plug Boot
Connects the spark plug with the 
ignition lead.
15 Muffler with Spark Arresting Screen
Muffler reduces exhaust noises and 
diverts exhaust gases away from 
operator.
Spark arresting screen is designed 
to reduce the risk of fire.
16 Line Limiting Blade
Metal blade at the deflector which 
keeps the line of the mowing head 
at the proper length.
17 Deflector
Designed to reduce the risk of injury 
from foreign objects flung 
backwards toward the operator by 
the cutting attachment and from 
contact with the cutting attachment.
18 Mowing Head
The cutting attachment, i.e. mowing 
head, for different purposes.
19 Drive Tube
Encloses and protects the drive 
shaft between the engine and 
bearing housing.
EPA / CEPA
The Emission Compliance Period 
referred to on the Emissions 
Compliance Label indicates the number 
of operating hours for which the engine 
has been shown to meet Federal 
emission requirements.
Category
CARB
The Emission Compliance Period used 
on the CARB-Air Index Label indicates 
the terms:
Engine
Single cylinder two-stroke engine
Specifications
A = 300 hours
B = 125 hours
C= 50hours
Extended = 300 hours
Intermediate = 125 hours
Moderate = 50 hours 
						

							FS 45, FS 46
English
36
Ignition System
Electronic magneto ignition
Fuel System
All position diaphragm carburetor with 
integral fuel pump
WeightContact your STIHL dealer for 
information regarding special 
accessories that may be available for 
your product.Users of this unit should carry out only 
the maintenance operations described 
in this manual. Other repair work may be 
performed only by authorized STIHL 
service shops.
Warranty claims following repairs can be 
accepted only if the repair has been 
performed by an authorized STIHL 
servicing dealer using original STIHL 
replacement parts.
Original STIHL parts can be identified by 
the STIHL part number, the { 
logo and, in some cases, by the STIHL 
parts symbol K. The symbol may 
appear alone on small parts. Displacement: 1.66 cu. in. 
(27.2 cm
3)
Bore: 1.34 in. (34 mm)
Stroke: 1, 18 in. (30 mm)
Engine power to 
ISO 8893:1HP (0.75kW) at 
7,000 rpm
Idle speed: 2,800 rpm
Max. engine speed: 9,500 rpm
Max. output shaft 
speed (cutting 
attachment): 9,500 rpm
Spark plug (resistor 
type):Bosch WSR 6 F, 
NGK BPMR 7 A
Electrode gap: 0.02 in. (0.5 mm)
Fuel tank capacity: 11.2 fl.oz (0.33 L)
dry, without cutting attachment and 
deflector
FS 45 9.0 lbs (4.1 kg)
FS 46 9.3 lbs. (4.2 kg)Special AccessoriesMaintenance and Repairs 
						

							FS 45, FS 46
English
37
Not for California
Your Warranty Rights and Obligations
The U.S. Environmental Protection 
Agency (EPA) and STIHL Incorporated 
are pleased to explain the Emission 
Control System Warranty on your 
equipment type engine. In the U.S. new 
1997 and later model year small off-road 
equipment engines must be designed, 
built and equipped, at the time of sale, to 
meet the U.S. EPA regulations for small 
non road engines. The equipment 
engine must be free from defects in 
materials and workmanship which 
cause it to fail to conform with U.S. EPA 
standards for the first two years of 
engine use from the date of sale to the 
ultimate purchaser.
STIHL Incorporated must warrant the 
emission control system on your small 
off-road engine for the period of time 
listed below provided there has been no 
abuse, neglect or improper maintenance 
of your small off-road equipment engine.
Your emission control system includes 
parts such as the carburetor and the 
ignition system. Also included may be 
hoses, and connectors and other 
emission-related assemblies.
Where a warrantable condition exists, 
STIHL Incorporated will repair your 
small off-road equipment engine at no 
cost to you, including diagnosis (if the 
diagnostic work is performed at an 
authorized dealer), parts, and labor.Manufacturer's Warranty Coverage
In the U.S., 1997 and later model year 
small off-road equipment engines are 
warranted for two years. If any emission-
related part on your engine is defective, 
the part will be repaired or replaced by 
STIHL Incorporated free of charge.
Owner's Warranty Responsibilities
As the small off-road equipment engine 
owner, you are responsible for the 
performance of the required 
maintenance listed in your instruction 
manual. STIHL Incorporated 
recommends that you retain all receipts 
covering maintenance on your small off-
road equipment engine, but STIHL 
Incorporated cannot deny warranty 
solely for the lack of receipts or for your 
failure to ensure the performance of all 
scheduled maintenance.
Any replacement part or service that is 
equivalent in performance and durability 
may be used in non-warranty 
maintenance or repairs, and shall not 
reduce the warranty obligations of the 
engine manufacturer.
As the small off-road equipment engine 
owner, you should be aware, however, 
that STIHL Incorporated may deny you 
warranty coverage if your small off-road 
equipment engine or a part has failed 
due to abuse, neglect, improper 
maintenance or unapproved 
modifications.
You are responsible for presenting your 
small off-road equipment engine to a 
STIHL service center as soon as a 
problem exists. The warranty repairs will 
be completed in a reasonable amount of 
time, not to exceed 30 days.If you have any questions regarding your 
warranty rights and responsibilities, 
please contact a STIHL customer 
service representative at 1-800-467-
8445 or you can write to
STIHL Inc.,
536 Viking Drive, P.O. Box 2015,
Virginia Beach, VA 23450-2015
www.stihlusa.com
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the 
ultimate purchaser and each 
subsequent purchaser that your small 
off-road equipment engine will be 
designed, built and equipped, at the time 
of sale, to meet all applicable 
regulations. STIHL Incorporated also 
warrants to the initial purchaser and 
each subsequent purchaser that your 
engine is free from defects in materials 
and workmanship which cause the 
engine to fail to conform with applicable 
regulations for a period of two years.
Warranty Period
The warranty period will begin on the 
date the utility equipment engine is 
purchased by the initial purchaser and 
you have signed and sent back the 
warranty card to STIHL.
If any emission-related part on your 
engine is defective, the part will be 
replaced by STIHL Incorporated at no 
cost to the owner. Any warranted part 
which is not scheduled for replacement 
as required maintenance, or which is 
scheduled only for regular inspection to 
the effect of "repair or replace as 
necessary" will be warranted for the 
warranty period. Any warranted part 
which is scheduled for replacement as 
STIHL Incorporated Federal 
Emission Control Warranty 
Statement 
						

							FS 45, FS 46
English
38 required maintenance will be warranted 
for the period of time up to the first 
scheduled replacement point for that 
part.
Diagnosis
You, as the owner, shall not be charged 
for diagnostic labor which leads to the 
determination that a warranted part is 
defective. However, if you claim 
warranty for a component and the 
machine is tested as non-defective, 
STIHL Incorporated will charge you for 
the cost of the emission test. Mechanical 
diagnostic work will be performed at an 
authorized STIHL servicing dealer. 
Emission test may be performed either 
at STIHL Incorporated or at any 
independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy 
warranty defects at any authorized 
STIHL servicing dealer or warranty 
station. Any such work shall be free of 
charge to the owner if it is determined 
that a warranted part is defective.
Any manufacturer-approved or 
equivalent replacement part may be 
used for any warranty maintenance or 
repairs on emission-related parts and 
must be provided without charge to the 
owner. STIHL Incorporated is liable for 
damages to other engine components 
caused by the failure of a warranted part 
still under warranty.
The following list specifically defines the 
emission-related warranted parts:
–Air Filter
–Carburetor
–Fuel Pump–Choke (Cold Start Enrichment 
System)
–Control Linkages
–Intake Manifold
–Magneto or Electronic Ignition 
System (Ignition Module)
–Spark Plug
–Catalytic Converter (if applicable)
–Fuel Tank
–Fuel Cap
–Fuel Line
–Fuel Line Fittings
–Clamps
–Fasteners
Where to make a Claim for Warranty 
Service
Bring the product to any authorized 
STIHL servicing dealer and present the 
signed warranty card.
Maintenance Requirements
The maintenance instructions in this 
manual are based on the application of 
the recommended 2-stroke fuel-oil 
mixture (see also instruction "Fuel"). 
Deviations from this recommendation 
regarding quality and mixing ratio of fuel 
and oil may require shorter maintenance 
intervals.
Limitations
This Emission Control Systems 
Warranty shall not cover any of the 
following:Nrepair or replacement required 
because of misuse, neglect or lack 
of required maintenance,
Nrepairs improperly performed or 
replacements not conforming to 
STIHL Incorporated specifications 
that adversely affect performance 
and/or durability, and alterations or 
modifications not recommended or 
approved in writing by STIHL 
Incorporated,
and
Nreplacement of parts and other 
services and adjustments 
necessary for required maintenance 
at and after the first scheduled 
replacement point.