Stihl FS 110 User manual

Instruction Manual
Manual de instrucciones
Warning!
For safe operation follow all safety
precautions in Instruction Manual - improper
use can cause serious injury.
Advertencia!
Para su seguridad durante el manejo de este
producto, siga siempre las precauciones de
seguridad dadas en el manual de
instrucciones - el uso indebido puede causar
lesiones graves.
STIH)
STIHL FS 110
BA_U1_86_01.fm Seite 0 Donnerstag, 18. Mai 2006 9:56 09

1FS 110, FS 110 R
English / USA
BA_SE_097_001_01_10.fmPrinted on chlorine-free paper.
Printing inks contain vegetable oils; paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2006 0458 254 3021 B. M10. E6. CP. Printed in USA
STIHl
Contents
Guide to Using this Manual .............. 2
Safety Precautions and Working
Techniques ....................................... 3
Approved Combinations of
Cutting Tool, Deflector,
Handle and Harness ....................... 18
Approved Power Tool
Attachments .................................... 20
Mounting the Bike Handle .............. 20
Mounting the Loop Handle ............. 22
Adjusting the Throttle Cable ........... 24
Fitting the Carrying Eye .................. 24
Mounting the Deflector ................... 25
Mounting the Cutting Tools ............. 26
4-MIX Engine .................................. 30
Fuel ................................................ 30
Fueling ............................................ 31
Fitting the Harness ......................... 32
Balancing the Brushcutter .............. 33
Starting / Stopping the Engine ........ 34
Operating Instructions .................... 37
Cleaning the Air Filter ..................... 37
Motor Management ........................ 38
Adjusting the Carburetor ................ 38
Spark Arresting Screen
in Muffler ......................................... 40
Checking the Spark Plug ................ 40
Lubricating the Gearbox ................. 41
Replacing Starter Rope
and Rewind Spring ......................... 42
Storing the Machine ........................ 45
Replacing the Nylon Line ............... 45
Sharpening Metal Cutting Tools ...... 47
Inspections and Maintenance by
Dealer ............................................. 47
Maintenance Chart ......................... 48
Parts and Controls .......................... 50
Specifications ................................. 53
Special Accessories ....................... 53
Maintenance and Repairs .............. 54
STIHL Incorporated Federal and
California Emission Control
pWarranty Statement ...................... 55
Trademarks .................................... 57
Allow only persons who understand this
manual to operate your brushcutter.
To receive maximum performance and
satisfaction from your STIHL brush-
cutter, it is important that you read and
understand the maintenance and safety
precautions, starting on page 3, before
using your brushcutter.
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 brushcutter is a high-speed
cutting tool some special safety pre-
cautions 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.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improve-
ments are made from time to time. If the
operating characteristics or the appear-
ance of your brushcutter differs from
those described in this manual, please
contact your STIHL dealer for informa-
tion and assistance.

2
English / USA
FS 110, FS 110 R
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
:A bullet marks a step or procedure
without direct reference to an
illustration.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Caution where there is a risk of
damaging the machine or its
individual components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s under-
standing of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual may refer to
several models with different
features. Components that are not
installed on all models and related
applications are marked with an
asterisk (*). Such components may
be available as special accessories
from your STIHL dealer.
Engineering improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore some changes, modifications
and improvements may not be covered
in this manual.
Guide to Using this Manual

3FS 110, FS 110 R
English / USA
Warning!
Because a brushcutter is
a high-speed, fast-cutting
power tool, special safety
precautions must be
observed to reduce the risk of personal
injury.
It is important that you
read, fully understand and
observe the following
safety precautions and
warnings. Read the
owner's manual and the
safety instructions periodically. Careless
or improper use of any brushcutter may
cause serious or fatal injury.
Have your STIHL dealer show you how
to operate your brushcutter. Observe all
applicable local safety regulations,
standards and ordinances.
!Warning!
Do not lend or rent your brushcutter
without the owner's manual. Be sure that
anyone using your brushcutter
understands the information contained
in this manual.
!Warning!
The use of any brushcutter may be
hazardous. If the rotating cutting tool
comes in contact with your body, it will
cut you. When it comes in contact with
solid foreign objects such as rocks or
bits of metal, it may fling them directly or
by ricochet in the direction of bystanders
or the operator.
Striking such objects could damage the
cutting attachment and may cause
blades to crack, chip or break.
STIHL does not recommend the use of
rigid blades when cutting in stony areas.
Thrown objects or damaged blades may
result in serious or fatal injury to the
operator or bystanders.
!Warning!
Minors should never be allowed to use a
brushcutter. Bystanders, especially
children, and animals should not be
allowed in the area where a brushcutter
is in use.
Never let the brushcutter run
unattended.
Most of these safety precautions and
warnings apply to the use of all STIHL
brushcutters. Different models may have
different parts and controls. See the
appropriate section of your owner's
manual for a description of the controls
and function of the parts of your model
brushcutter.
Safe use of a brushcutter involves
1. the operator
2. the brushcutter
3. the use of the brushcutter.
THE OPERATOR
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgement. Do not operate a
brushcutter when you are fatigued.
Be alert – if you get tired while operating
your brushcutter, take a break.
Tiredness may result in loss of control.
Working with any brushcutter can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
a brushcutter.
Safety Precautions and
Working Techniques

4
English / USA
FS 110, FS 110 R
!Warning!
Prolonged use of a brushcutter (or other
machines) exposing the operator to
vibrations may produce whitefinger
disease (Raynaud's phenomenon) or
carpal tunnel syndrome.
These conditions reduce the hand's
ability to feel and regulate temperature,
produce numbness and burning
sensations and may cause nerve and
circulation damage and tissue necrosis.
All factors which contribute to white-
finger disease are not known, but cold
weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
– Most STIHL power tools are
available with an anti-vibration
("AV") system designed to reduce
the transmission of vibrations
created by the engine to the
operator's hands. An AV system is
recommended for those persons
using power tools on a regular or
sustained basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A brushcutter with
loose components or with damaged
or worn AV buffers will tend to have
higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressures and
take frequent breaks.
All the above mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore continual and
regular users should monitor closely the
condition of their hands and fingers. If
any of the above symptoms appear,
seek medical advice immediately.
!Warning!
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with pacemaker should consult
their physician and the pacemaker
manufacturer before operating this tool.
Proper Clothing
!Warning!
To reduce the risk of injury, the operator
should wear proper protective apparel."
The deflector provided with your
brushcutter may not protect the operator
from all foreign objects (gravel, glass,
wire, etc.) thrown by the rotating cutting
attachment. Thrown objects may also
ricochet and strike the operator.

5FS 110, FS 110 R
English / USA
!Warning!
To reduce the risk of injury
to your eyes never
operate a brushcutter
unless wearing goggles or
properly fitted safety
glasses with adequate top
and side protection complying with ANSI
Z 87.1 (or your applicable national
standard). To reduce the risk of injury to
your face STIHL recommends that you
also wear a face shield or face screen
over your goggles or safety glasses.
!Warning!
Brushcutter noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their hearing checked
regularly.
Protect your hands with
gloves when handling the
brushcutter and the
cutting tool. Heavy-duty,
nonslip gloves improve
your grip and protect your
hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Avoid loose-
fitting jackets, scarfs,
neckties, jewelry, flared or
cuffed pants, unconfined longhair or
anything that could become caught on
branches, brush or moving parts of the
unit. Wear long pants made of heavy
material to protect your legs. Do not
wear shorts, pants, sandals or go bare
foot. Secure hair so it is above shoulder
level.
Good footing is most
important in brushcutter
work. Wear sturdy boots
with nonslip soles. Steel-
toed safety boots are
recommended.
Wear an approved safety
hard hat to reduce the risk
of injury to your head
when there is a danger of
head injuries.
THE BRUSHCUTTER
For illustrations and definitions of the
brushcutter parts see the chapter on
"Parts and Controls".
!Warning!
Never modify a brushcutter in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL brushcutter
models are authorized. Although certain
unauthorized attachments are useable
for the STIHL brushcutter, their use may,
in fact, be extremely dangerous.

6
English / USA
FS 110, FS 110 R
THE USE OF THE
BRUSHCUTTER
Transporting the brushcutter
!Warning!
Always turn off the engine and make
sure the cutting attachment has stop-
ped before putting a brushcutter down.
When transporting your brushcutter in a
vehicle, properly secure it to prevent
turnover, fuel spillage and damage to the
brushcutter. Keep metal cutting tools
covered with the transport guard
(optional accessory).
Preparation for the use of the
brushcutter
Adjust carrying harness and hand grip to
suit your size before starting work. The
machine should be properly balanced as
specified in your owner's manual for
proper control and less fatigue in
operation.
Always check your brushcutter for
proper condition and operation before
starting, particularly the throttle trigger,
throttle trigger interlock (if applicable),
stopswitch, cutting tool, deflector and
harness.
Arrows on the deflector (A) and stop (B)
show the correct direction of rotation of
the cutting tool.
The throttle trigger must move freely and
always spring back to the idle position.
The cutting tool must be properly
tightened and in safe operating
condition. Inspect for loose parts (nuts,
screws, etc.) and for cracked, bent,
warped or damaged blades.
Fueling
Your STIHL brushcutter uses an oil-
gasoline mixture for fuel (see the chap-
ter on "Fuel" of your owner's manual).
!Warning!
Gasoline is an extremely
flammable fuel. If spilled
and ignited by a spark or
other ignition source, it
can cause fire and serious
burn injury or property
damage. Use extreme caution when
handling gasoline or fuel mix.
Do not smoke or bring any fire or flame
near the fuel or brushcutter.
Fueling Instructions
!Warning!
Fuel your brushcutter in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before
refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
A
000BA006 KN
B
000BA007 KN

7FS 110, FS 110 R
English / USA
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your brushcutter carefully so as
to allow any pressure build-up in the
tank to release slowly. Never remove
fuel filler cap while engine is running.
Select bare ground for fueling and move
at least 10 feet (3 m) from the fueling
spot before starting the engine. Wipe off
any spilled fuel before starting your
brushcutter and check for leakage.
!Warning!
Check for fuel leakage while refueling
and during operation. If fuel or oil
leakage is found, do not start or run the
engine until leak is fixed and spilled fuel
has been wiped away. Take care not to
get fuel on your clothing. If this happens,
change your clothing immediately.
Different models may be equipped with
different fuel caps.
Cap with Grip
!Warning!
In order to reduce the risk of fuel spillage
and fire from an improperly tightened
fuel cap, correctly position and tighten
the fuel cap in the fuel tank opening.
To do this with this STIHL
cap, raise the grip on the
top of the cap until it is
upright at a 90° angle.
Insert the cap in the fuel
tank opening with the
triangular marks on the grip of the cap
and on the fuel tank opening lining up.
Using the grip, turn the cap firmly
clockwise as far as it will go (approx. a
quarter turn).
Fold the grip flush with the
top of the cap. If the grip
does not lie completely
flush with the cap and the
detent on the grip does
not fit in the
corresponding recess in the filler neck,
the cap is not properly seated and
tightened and you must repeat the
above steps.
Screw Cap
!Warning!
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill
quantities of fuel. In order
to reduce the risk of fuel
spillage and fire, tighten the fuel filler cap
by hand with as much force as possible.
Operating instructions
!Warning!
Improper use of
any brushcutter
can cause serious
or fatal personal
injury. To reduce
the risk of personal injury to the operator
from blade contact and thrown objects,
make sure your unit is equipped with the
proper deflector, handle and harness for
the type of cutting attachment being
used (see chart in chapter on "Approved
Combinations of Cutting Tool, Deflector,
Handle and Harness").

8
English / USA
FS 110, FS 110 R
Keep the deflector (and the skirt where
appropriate) adjusted properly at all
times (see chapter on mounting the
various cutting tools of your owner's
manual).
Starting
!Warning!
Your brushcutter is a one-person
machine. Once started, it may fling
foreign objects for a great distance.
To reduce the risk of eye and other injury
insure that bystanders are at least 50
feet (15 m) away. Bystanders should be
encouraged to wear eye protection. Stop
the engine and cutting tool immediately
if you are approached. Start and operate
your brushcutter without assistance. For
specific starting instructions, see the
appropriate section of your manual.
Place the brushcutter on firm ground or
other solid surface in an open area.
Maintain a good balance and secure
footing.
!Warning!
To reduce the risk of injury from loss of
control, be absolutely sure that the
cutting tool is clear of you and all other
obstructions and objects, including the
ground, because when the engine starts
at starting-throttle, engine speed will be
fast enough for the clutch to engage and
turn the cutting tool.
!Warning!
When you pull the starter grip, don't
wrap the starter rope around your hand.
Do not allow the grip to snap back, but
guide the starter rope to rewind it
properly. Failure to follow this procedure
may result in injury to hand or fingers
and may damage the starter
mechanism.
With the engine running but at idle,
attach the brushcutter to the spring hook
of your harness (see appropriate
chapter of this manual).
Catalytic converter
!Warning!
Some STIHL brushcutter
models are equipped with
a catalytic converter,
which is designed to
reduce the exhaust
emissions of the engine
by a chemical process in the muffler.
Due to this process, the muffler does not
cool down as rapidly as conventional
mufflers when the engine returns to idle
or is shut off. To reduce the risk of fire
and burn injuries, the following specific
safety precautions must be observed.
!Warning!
Since a muffler with a catalytic converter
cools down less rapidly than conven-
tional mufflers, always set your
brushcutter down in the upright position
and never locate it where the muffler is
near dry brush, grass, wood chips or
other combustible materials while it is
still hot.
15m (50ft)

9FS 110, FS 110 R
English / USA
Let the engine cool down sitting on
concrete, metal, bare ground or solid
wood (e.g. the trunk of a felled tree)
away from any combustible substances.
!Warning!
To reduce the risk of fire or burn injury,
let the unit cool down before refueling
your brushcutter after use.
!Warning!
Never disassemble or modify your
muffler. The muffler could be damaged
and cause an increase in heat radiation
or sparks, thereby increasing the risk
of fire or burn injury. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL Servicing Dealer only.
!Warning!
To reduce the risk of fire or burn injury,
keep the area around the muffler clean.
Remove all debris such as pine needles,
branches or leaves.
!Warning!
An improperly mounted or damaged
cylinder housing or a damaged/
deformed muffler shell may interfere
with the cooling effect of the catalytic
converter. To reduce the risk of fire or
burn injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a damaged/
deformed muffler shell. Your catalytic
converter is furnished with screens
designed to reduce the risk of fire from
the emission of hot particles. Due to the
heat from the catalytic reaction, these
screens will normally stay clean 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.
Working Conditions
Operate and start your brushcutter only
outdoors in a ventilated area.
Operate the brushcutter under good
visibility and daylight conditions only.
Work carefully.
!Warning!
Your brushcutter
produces toxic exhaust
fumes as soon as the
engine is running. These
gases (e.g. carbon
monoxide) may be
colorless and odorless. To reduce the
risk of serious or fatal injury from
inhaling toxic fumes, never run the
brushcutter indoors or in poorly
ventilated locations.
!Warning!
Use of this product can generate dust
and fumes containing chemicals known
to cause respiratory disease, cancer,
birth defects, or other reproductive
harm. If you are unfamiliar with the risks
associated with the particular dust or
fume at issue, consult your employer,
governmental agencies such as OSHA
and NIOSH and other sources on
hazardous materials. California and