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Stihl FS 88 Manual

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STIHL
FS
BB,
7DB
Instruction
Manual
Owner's
Manual
Assembling
Safety Precautions
Operating
Instructions
Maintenance
Contents
Parts and Controls Starting
34
This manual contains warnings,
- Version with Bike Handle 2 Adjusting Carburetor 37 operating and safety precautions for the
- Version with Loop Handle 4
Operating Instructions 40 STIHL
FS
88 and FS 108 brushcutters.
- Version with Loop Handle and Checking Spark Plug
41
Pay special attention to the safety
Standoff Lever 4 Cleaning Air Filter
41
precautions outlined on pages 6 to 17.
Safety Precautions and Lubricating Gearbox 42
Allow only persons who understand this
Working Techniques
6 Lubricating Drive Shaft 42
manual to operate your brushcutter.
Selecting the Cutting Tool 18 Sharpening Cutting Tools
To
receive maximum performance and
Mounting the Bike Handle 20 - Grass Cutting Blade 230-4
43
satisfaction from your STIHL brush-
Mounting
loop
Handle with - Grass Cutting Blade 230-8
44
cutter,
it
is
important that you read and
Standoff Lever
21
- Brush Knife 250 45
understand the maintenance and safety
Mounting the Loop Handle - Circular Saw Blade 200
precautions before using your brush-
- Version A 22
(chisel tooth) 46
cutter. Contact your STIHL dealer
or
the
- Version B
23
- Circular Saw Blade 200
STIHL distributor for your area if you do
Mounting the Deflector 24 (scratcher tooth)
47
not understand any of the instructions
in
- Fitting stop 24 Replacing Starter Rope and
this manual.
Mounting the Cutting Tools 25 Rewind Spring
48
- STIHL Supercut 2-2 26
Spark Arresting Screen
in
Warn
ng!
- STIHL Supercut 20-2
26 Muffler
51
Because a brushcutter
is
a high-speed
- STIHL Autocut 25-2
26 Storing the Machine
51
cutting tool some special safety pre-
- STIHL Autocut 30-2 26 Maintenance Chart
52
cautions must be observed to reduce
- STIHL Autocut 24-2
27 Specifications
53
the risk of personal injury. Careless or
- STIHL Polymatic 30-2 27 Special Accessories
55
improper use may cause serious or
- STIHL Polycut 40-3
28
even fatal injury. Make shure your unit is
- STIHL Fixed Line Head
28
equipped with the proper deflector,
- Grass Cutting Blade 230
29
handle and harness for the type of
- Brush Knife 250
29
cutting attachment being used. Always
- Circular Saw Blade 200
30
wear
proJ<.er
eye protection.
Fuel
31
Fueling
32
STIHL's philosophy
is
to continually
Fitting the Harness 32
improve all of its products. As a result,
engineering changes and improve-
ments are made from time to time.
If
the
Printed on chlorine-free paper
operating characteristics or the appear-
ance of your brushcutter differs from
those described
in
this manual, please
contact your STIHL dealer for informa-
© 1996
Andreas
Stihl.
Waiblingen
100813970
STIHL®
tion and assistance.
0458 357 3021. M
5.
C 6 S
Printed
in
Japan
1
Parts and Controls
2
1
2
9
Version with Bike Handle
1 = Handle support
2
= Throttle trigger
3
= Slide control
4
= Throttle trigger interlock
5
= Bike handle
6
= Throttle cable retainer
7
= Carrying loop
8
= Throttle cable / stop switch wire
9
= Spark plug terminal
10
= Air filter cover
11
= Choke lever
12
= Machine support
13
= Fuel tank
14
= Fuel filler cap
15
= Starter grip
16
= Carburetor adjusting screws
17
= Muffler
18
= Deflector (for all cutting
tools, without skirt)
19
= Metal cutting
Itool
(cutting blade 230)
Definitions
8.
Throttle
cable/stop
switch
wire.
16.
Carburetor
adjusting
screws.
Connect operator's control grip to
For tuning carburetor.
1.
Handle
support.
the powerhead.
Connects the drive shaft
to
the handle bars.
17.
Muffler.
9.
Spark
plug
terminal. Attenuates exhaust noises
Connects the spark plug
to
the and diverts exhaust gases away
2.
Throttle
trigger.
ignition wire. from operator.
Controls the speed of the engine.
10.
Air
filter cover. 18. Deflector.
3. Slide
control.
Covers the air filter element.
The deflector
is
designed to reduce
Starting throttle lock and stop switch.
the risk of injury from foreign objects
Keeps the throttle partially open
flung backwards toward the operator
during starting and switches the
11.
Choke
lever.
by the cutting tool and from contact
engine's ignition off and stops the Eases engine starting
with the cutting tool.
engine.
by
enriching mixture.
19.
Cutting
tool.
4.
Throttle
trigger
interlock.
12. Machine
support.
The cutting attachment,
i.
e.
blade,
Must
be
depressed before the
For resting machine
on
the ground.
made from metal for different pur-
throttle trigger can
be
activated.
poses (special accessory).
13. Fuel
tank.
5. Bike handle. For fuel and oil mixture.
To
hold
the
brushcutter
with both hands.
14. Fuel filler cap.
.......>
For closing the fuel tank.
6. Throttle cable retainer.
Fixes the throtlle cable
on the drive shaft.
15. Starter grip.
The grip of the pull starter,
which
is
the device to start
7. Carrying lOop. the engine.
The device to connect the
brushcutler to the harness.
3
8
Version
with
Loop
Handle
and
loop
handle
with
standoff
lever
1 = Loop handle
2
= Standoff lever
3
= Carrying loop
(not all markets)
4
= Slide control
5
= Throttle trigger
6
= Throttle trigger interlock
7
= Throttle cable / stop switch wire
8
= Spark plug terminal
9
= Air filter cover
10=
Choke lever
11
= Machine support
4
19
17
18
12 = Fuel tank
13
= Fuel filler cap
14
= Starter grip
15
= Carburetor adjusting screws
16
= Muffler
17
= Deflector (for mowing heads)
18
= Line limiting blade
19
= Cutting tool
Definitions
8.
Spark
plug
terminal.
16. Muffler.
Connects the spark plug
to
the Attenuates exhaust noises
1.
Loop
handle. ignition wire. and diverts exhaust gases away
For easy control of
from operator.
machine during cutting work.
9.
Air
filter
cover.
Covers the air filter element.
17. Deflector.
2.
Standoff
lever. The deflector
is
designed to reduce
Helps keep unit at a safe distance
10.
Choke
lever. the risk of injury from foreign objects
from operator's feet and legs. Eases engine starting
flung backwards toward the operator
by enriching mixture. by the cutting tool and from contact
with the cutting tool.
3.
Carrying
loop.
The device to connect the
11.
Machine
support.
brushcutter to the harness. For resting machine on the ground. 18.
Line
limiting
blade.
Metal blade at the deflector
in
order
to
keep the line of the mowing head
4.
Slide
control.
12. Fuel tank.
at the proper length.
Starting throttle lock and stop switch. For fuel and oil mixture.
Keeps the throttle partially open
during starting and switches the
19.
Cutting
tool.
engine's ignition off and stops the 13.
Fuel
filler
cap.
The cutting attachment,
i.
e.
cutting
engine. For closing the fuel tank. head, for different purposes
(special accessory).
5.
Throttle
trigger.
14.
Starter
grip.
Controls the speed of the engine. The grip of the pull starter,
which is the device
to
start
....,.
the engine.
6.
Throttle
trigger
interlock.
Must
be
depressed before the
throttle trigger can be activated.
15.
Carburetor
adjusting
screws.
For tuning carburetor
7.
Throttle
cable/stop
switch
wire.
Connect operator's control grip to
the powerhead.
5
Safety Precautions and
Working Techniques
&
anlgl
Because a brushcutter is
, a high-speed, fast-cutting
• power tool, special safety
precautions must be obseNed to reduce
the risk of personal injury.
It
is important that you
read, fully understand
and obseNe the following
safety precautions and
warnings. Read the owner's manual and
the safety instructions periodically. Care-
less or improper use of any brushcutter
may cause serious or fatal injury.
Have your STIHL dealer show you how
to
operate your brushcutter.
ObseNe
all
applicable local safety regulations,
standards and ordinances.
Warning!
The use of any brushcutter may be
hazardous.
If
the rotating cutting
1001
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.
6
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.
Warning!
Do not lend
or
rent your brushcutter
without the owner's manual. Be sure
that anyone using your brushcutter un-
derstands the information contained
in
this manual.
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 judgment. Do not operate a
brushcuJter 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.
Prolonged use of a brushcutter (or other
machines) exposing the operator
to
vibrations may produce whitefinger di-
sease (Raynaud's phenomenon) or car-
pal tunnel syndrome. These conditions
reduce the hand's ability
to
feel and regu-
late temperature, produce numbness
and burning sensations and may cause
nerve and circulation damage and tissue
necrosis.
Warnlngl
Antivibration systems do not guarantee
that you will not sustain whitefinger di-
sease 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.
U)
o
o
.q:
en
o
o
o
Proper Clothing
(i
Warning!
Brushcutter operation can
0·0
cause serious injury
to
eyes,
ears and person. The de-
flector provided with your brushcutter
may not protect the operator from all
foreign objects (gravel, glass, wire, etc.)
thrown by the wheeling cutting attach-
ment. Thrown objects may also ricochet
and strike the operator. Therefore,
to
re-
duce 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 app-
licable 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.
Wear proper protective clothing.
Protect your hands with gloves when
handling the brushcutter and the cutting
tooi. Heavy-duty, nonslip gloves improve
your grip and protect your hands.
Clothing must be sturdy and snug·fitting,
but allow complete freedom of move-
ment. Avoid loose-fitting jackets, scarfs,
neckties, jewelry, flared or cuffed pants,
unconfined long hair or anything that
could become caught
on
branches,
brush
Of-
moving parts of the unit. Wear
long' pants made of heavy material
to
protect your legs. Do not wear shorts.
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.
7
,...
o
o
ca
o
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A
~
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0
«
al
0
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B
o
o~
o
~
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.
THE USE OF THE
BRUSHCUTIER
For illustrations and definitions of the
brushcutter parts see the chapter on
"Parts and Controls"!
THE
BRUSHCUTIER
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
fatique in operation.
Always check your bruhcutter for
proper condition and operation before
starting, particularly the throttle trigger,
throttle trigger interlock (if applicable
stop switch, cutting tool, deflector and
harness.
Arrows on the deflector (A) and stop (8)
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.
Ir
spilled or 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.
8
Fueling Instructions
Fuel your brushcutter
in
well-ventilated
areas, outdoors.
rntng
l
Gasoline vapor pressure may build up
inside the gas tank of a two cycle engine
depending on the fuel used, the weather
condition, and the venting system of the
tank.
In
order to reduce
th
risk of
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.
.
arnmg!
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.
If
this happens,
change your clothing immediately.
~
Warning!
J1~
'\
Unit vibrations can
.(
cause an Improperly
tightened fuel cap to
loosen or come off and
spill quantities of fuel.
In
order
to
reduce
risk of fuel spillage and fire, tighten fuel
cap by hand with as much force as
possible. The screw driver end of the
STIHL combination wrench
or
other
similar tool can be used as an aid
in
tightening slotted fuel caps.
Starting
Warning!
Your brushcutter
is
a oneperson machi-
ne. Once started
it
may fling foreign ob-
jekts for a great distance.
To
reduce the risk of eye and other injury
insure that bystanders are at least 50
feet (15 m) away. 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.
To
reduce the risk of injury from loss of
control, be absolutely sure that the
cut-
ting 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.
'-
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 properly.
Failure to follow this procedure may
result
in
injury to hand
or
fingers and
may damage the starter mechanism.
9
\
f\
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;:;
...
CD
8
o
I
~
Before cutting, inspect
the area for stones, glass,
pieces of metal, trash or
other solid objects. The
cutting attachment could throw objects
of this kind.
~.
To
reduce the
. risk of injury
from thrown
objects and
blade contact,
never operate a brushcutter without a
properly mounted deflector. Keep the
skirt on the deflectors adjusted properly
at all times (see chapter
on
mounting the
various cutting tools of your owner's
manual). Do not overreach. Keep proper
footing and balance at all times.
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.
Always hold the brushcutter firmly with
both hands. Wrap your fingers tightly
around the handles, keeping the hand-
les cradled between your thumb and
forefinger. Keep your hands
in
this positi-
on, to have your brushcutter under con-
trol at all times. Make sure your brush-
cutter handles and grip are
in
good con-
dition and free of moisture, pitch, oil or
grease.
10
Warningl
Never attempt
to
operate any brush
cutter with one hand. Loss of control of
the brushcutter resulting
in
serious or
fatal injury may result.
To
reduce the risk of bodily injury
resulting from loss of control and contact
with the cutting tool, make sure your
unif':-
is
equipped with the proper handle ana
harness for the type of cutting attach-
ment being used (see chart
in
chapter
on "Selecting the Cutting Tool").
Special care must be taken
in
slippery
conditions (wet ground, snow) and
in
difficult, over-grown terrain. Watch for
hidden obstacles such as tree stumps,
roots and ditches to avoid stumbling.
Waming'
This brushcutter
is
normally to be used
at ground level with the cutting attach-
ment parallel
to
the ground. Use of a
brushcutter above ground level or with
the cutting attachment perpendicular
to
the ground may increase the risk of
injury, since the cutting attachment
is
more fully exposed and the brushcutter
may be more difficult
to
control. Never
use your brushcutter as a hedge
trimmer.
W mmg!
When using rigid blades, avoid cutting
close to fences, sides of buildings, tree
trunks, stones or other such objects
that could cause the brushcutter to kick
out or could cause damage to the
blade. STIHL recommends use of the
nylon line heads or Polycut head for
such jobs.
In
addition, be alert to an
increased possibility of ricochets
in
such situations.
Do not operate using the starting
throttle lock as you do not have control
of the engine speed. See section of your
owner's manual on the proper use of the
slide control.
If
the cutting tool or deflector becomes
clogged or stuck, always turn off the
engine and make sure the cutting tool
has stopped, before cleaning. Grass,
weeds, etc. should be cleaned off the
cutting tool at regular intervals.
Warning!
During CUlling, check the tightness and
the condition of the cutting tool at
regular intervals.
If
the behavior of the
tool changes, stop the engine immedi-
ately, and check the nut securing
the tool for tightness and the cutting tool
for cracks and damage.
Replace cracked, bent, warped, dam
aged or dull cutting tools immediately.
Such tools may shatter at high speed
and cause serious or fatal injury.
Warn'ng'
A loose blade may cause the blade
to
vibrate, crack, break or come off the
brushcutter, which may result
in
serious or fatal injury. Make sure that
the blade is properly tightened. Use the
wrench supplied or one of sufficient
length to obtain the proper torque.
If
the
blade loosens after being properly
tightened, stop work immediately. The
retaining nut may be worn or damaged
and should be replaced. Never use
unauthorized parts to secure the blade.
If
the blade continues
to
loosen, see
your STIHL dealer. Never use a
brushculler with a loose blade.
Important adjustments
amlng'
To
reduce the risk of personal injury from
loss of control or contact with the run-
ning grass cutting blade, do not use a
grass cutting blade with incorrect idle
adjustment. At correct idle speed, the
grass cutting blade should not move.
For directions to adjust idle speed, see
the appropriate section of your owner's
manual.
If
you cannot set the correct idle speed,
have your STIHL dealer check your
brushcutter and make proper
adjustments or repairs.
Waming'
Never touch a rotating cutting tool with
your hand or any part of your body. It
continues to rotate for a short period
after the throttle trigger
is
released
(flywheel effect).
Operating instructions
(jG
w
amln
9
1
o Improper use of any
~
brush-cutter can
cause serious or
fatal personal injury. Read, understand
and follow all safety instructions
in
your
owner's manual before operating these
products.
To
reduce the risk of personal
injury
to
the operator from blade con-
tactand thrown objects, make sure your
unit
is
equipped with the proper de-
flector, handle and harness for the type
of cutting attachment being used ( see
chart
in
chapter on "Selecting the Cut-
ting Tool"). Always wear proper eye pro-
tection.
12
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Do not cut any material other than
grass, brush and wood. The cutting
tools may be used only for the
operations described
in
your manual.
With the engine running, attach the
brushcutter to the spring hook of your
harness (see appropriate chapter of this
manual).
USING THE CUTTING TOOLS
For an illustration of the various cutting
tools and instructions on proper mount-
ing see the chapter on "mounting the
cutting tools"
in
your owner's manual.
Using the mowing heads
The STIHL Supercut, Autocut, Polymatic
and Polycut mowing heads produce a
clean and tidy finish.
They are
to
be used only on brushcut-
ters equipped with a chopper blade
in
the deflector
in
order to keep the line at
the proper length (see "Parts and
Controls" chapter of this 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 than with the polymer blades.
However, the polymer bladed STIHL
"Polycut" produces a better cut
if
there
are no plants along the edge of the lawn.
Sharpening
is
not necessary and worn
cutting blades are easily replaced.
Warnmg!
To
reduce the risk of serious injury.
never use wire or metal-reinforced line
"':--
or other material
in
place of the nylon
cutting lines. Pieces of wire could break
off and be thrown at high speed toward
the operator or bystanders.
STIHL "Supercut" mowing head
Fresh line
is
advanced automatically.
Frayed line
is
replaced by a simple
adjustment (see instruction sheet
supplied with mowing head).
f
STIHL
"Polymatic"
mowing
head
Frayed line
is
replaced by a simple
adjustment (see instruction sheet
supplied with mowing head).
STIHL
"Autocut"
mowing
head
Nylon cutting cord advances automat-
ically when tapped against the ground.
STIHL
"Polycut"
mowing
head
Important!
Three rectangular wear limit marks are
applied to the base (periphery)
of
the
Polycut.
To
reduce the risk of serious
injury from breakage of the head or
blades, the Polycut must not be used
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when
it
has worn as far as one of these
marks.
It
is
important to follow the
maintance instructions supplied with
the head!
Using
the
grass
cutting
blade
All
kinds of grass and weeds can be
easily cut with the cutting blade. The
brushcutter
is
swept in an
arcsimiliar to a scythe.
Warmngl
To
reduce the risk
of
serious or fatal
injury never attempt to cut woody
materials.
The
4-tooth
grass cutting blade
is
intented
to
cut grass and weeds.
It
has 4 cutting knives with cutting edges
on
both sides, i.e. front and
rear.
The
8-tooth
grass cutting blade
is
recommended for cutting fern or reed.
'-
Both bjades have to be resharpened
when all cutting edges are dull.
13
Using the brush knife
When fitted
to
the brushcutter, the
brush knife
is
suitable for applications
ranging from cutting matted grass to
clearing weeds, wild growth and scrub.
To
cut wild growth and scrub, lower the
rotating brush knife down onto the
growth to achieve a chopping effect.
Use the brushcutter like a scythe to cut
grass,
i.e.
sweep
it
to and fro
in
an
arc.
Warning!
When cutting woody materials, use the
left side of the blade to avoid "kickout"
(blade thrust) situations.
14
Warnlngl
Improper use of a brush knife may
cause
it
to crack, chip or shatter. Thrown
parts may seriously injure the operator
or bystanders.
To
reduce the risk of
personal injury
it
is essential to take the
following precautions:
Avoid contact with hard or solid foreign
objects such as stones, rocks or pieces
of metal.
Never cut wood or shrubs with a stem
diameter of more than 2cm (3/4") -
use a circular saw blade for such work.
Inspect the brush knife at regular short
intervals for signs of damage. Do not
continue working with a damaged brush
knife. Resharpen the brush knife re-
gUlarly (when
it
has dulled noticeably).
Warning!
When cutting young saplings or other
woody materials up
to
2cm (3/4")
in
diameter, use left side of the blade
to
avoid "kickout" situations (see
appropriate section
in
this manual). Do
not attempt to cut woody material with a
larger diameter, since the blade may
catch or jerk the brushcutter forward.
This may cause damage
to
the blade or
brushcutter or loss of control of the
brushcutter, resulting
in
personal injury
To
redUce the risk of serious injury
to
the operator or bystanders by a
kickout, never use a circular saw blade
on a brushcutter with a loop handle.
by experienced operators with speciali-
zed training
in
use and control of the
brushcutter.
amlngl
The risk of kickout is highest when
cutting in the darker shaded area.
To
reduce the risk of kickout and resulting
injury, do not use this area of the
circular saw blade for cutting trees or
shrubs. Special techniques using the
lighter shaded areas of the blade to cut
shrubs and trees should only
be
used
Before starting the cut, accelerate the
engine up
to
full throttle. Perform cut
with uniform pressure. STIHL recom-
mends that the circular saw blade be
applied to the right of the tree, using
the non-shaded area of the blade.
Warning'
In
order
to
reduce the risk of injury from
thrown objects
or
from operator
contact with the cutting tool, be sure
to
remount the standard deflector for all
other
u·ses.
N
o
<{
en
o
o
o
positioned against the tree during the
cutting process. Inexperienced users
should place the left side of the stop
against the tree trunk before beginning
to cut. This act will keep the brush-
cutter against the tree during the
cutting operation and will reduce the
risk of loss of control and possible
kickout (described in the following
section).
<D
o
<{
en
o
o
o
Using the circular saw blade
Circular saw blades are suitable for
thinning brush and cutting small trees up
to a diameter of 7 cm
(23/4
in). Do not
attempt to cut trees with larger
diameters, since the blade may catch or
jerk the brushcutter forward. This may
cause damage to the blade or loss of
control of the brushcutter which may
result
in
serious injury.
When the brushcutter with circular saw
blade is used
to
cut down small trees,
STIHL recommends that the standard
deflector be removed and replaced by
the special "stop" (see chapter "circular
saw blade" for mounting instructions).
This stop helps to keep the brushcutter
15
N
;;
~
§
Risk of "kickout" (blade thrust)
with all rigid cutting blades
Warning
l
Kickout (blade thrust) is the sudden and
uncontrolled motion towards the opera-
tor's right or rear that can occur when
the shaded area of the rotating blade
comes
in
cont<;:lct
with a solid object like
a tree, rock, bush or wall. The rapid co-
unterclockwise rotation of the blade may
be stopped or slowed, and the
cutting attachment may be thrown
in
an
area
to
the right or to the rear.
16
This kickout (blade thrust) may cause
loss of control of the brushcutter and
may result
in
serious or fatal injury to the
operator or bystanders.
To
reduce the
risk, extreme caution should be used
when cutting with the shaded area of
nay rigid blade and never use a rigid
blade on a brushcutter with a loop
handle.
MAINTENANCE, REPAIR AND
STORING
Use only identical STIHL replacement
parts for maintenance and repair.
Use of parts manufactured by others
may cause serious or fatal injury.
Follow the maintenance and repair
instructions
in
the appropriate section of
your owner's manual. Please refer
to
the
maintenance chart at the last pages of
this manual.
arnmgl
Always stop the engine and make sure
that the cutting tool
is
stopped before do-
ing any maintenance or repair work or
cleaning the brushcutter. Do not attempt
any maintenance or repair work not
described
in
your owner's manual. Have
such work performed at yourSTIHL
service shop only.
Never repair damaged cutting attach-
ments by welding, straightening or
modifying the shape. This may cause
parts of the cutting tool
to
come off and
result
in
serious
or
fatal injuries.
Check condition of culling tool at regular
short intervals.
If
behavior of tool
changes, check it immediately for
tightness or any signs of cracks
in
par-
ticular. Replace damaged or dull cUlling
tools immediately, even if they have only
superficial cracks.
If
the blade loosens
after being properly tightened, the
retaining nut may be worn or damaged
and should be replaced.
If
the blade
continues
to
loosen, see your STIHL
dealer. Do not attach any blade to a unit
without proper installation of all required
parts. Never use unauthorized parts to
secure the blade. Failure to use the
proper parts may cause the blade
to
fly
off and seriously injure the operator or
bystanders.
Check fuel filler cap for leaks at regular
intervals. Use the specified spark plug
and make sure
it
and the ignition lead
are always
in
good condition.
Warning!
Do
not operate your brushcutter if the
muffler
is
damaged, missing or mode-
fied. An improperly maintained muffler
will increase the risk of fire and hearing
loss. Never touch a hot muffler or burn
will
result.
If
your muffler was equipped
with a spark-arresting screen
to
reduce
the risk of fire (e.g.
in
the USA, Canada
and Australia), never operate your hedge
trimmer if the screen
is
missing or dama-
ged. Remember that the risk of forest
fi-
res is greater
in
hot or dry weather.
Warning!
In
order
to
reduce the risk of fire, do not
modify or remove any part of the muffler
or spark arrestor.
Keep cutting tool sharp. Tighten all nuts,
bolts and screws except the carburetor
adjustment screws after each use.
Keep spark plug and wire connection
tight and clean. The spark plug electrode
gap should be checked with a feeler
gauge at least every 50 operating hours
and reset
if
necessary. Fit a new spark
plug
if
the electrodes are badly pilled.
Store brushcutter
in
a dry, high or locked
location place and out of reach of
children.
Before storing for longer than a few
days, always empty the fuel tank.
Warnlngl
Keep hands and feet away from cUlling
tool.
17
Selecting
the
Cutting
Tool
Cutting
tools:
1 STIHL Supercut
20-1
mowing head
(FS
74
only)
2 STIHL Supercut 20-2 mowing head
3
STIHL Autocut 20-2 mowing head
(FS
74
only)
4 STIHL Autocut 24-2 mowing head
5 STIHL Autocut 25-2 mowing head
6 STIHL Autocut 30-2 mowing head
7 STIHL Polymatic 30-2 mowing head
8
STIHL Polycut 20-3 mowing head
9
STIHL Fixed Line head
10
Grass Cutting blade 230-4
11
Grass Cutting blade 230-8
12 Brush knife 250
13
Circular saw blade 200
(scratcher tooth)
14 Circular saw blade 200
(chisel tooth)
Deflectors:
15 Deflector for mowing heads
16
Deflector for
all
cutting tools
with
17 Skirt and line limiting blade
18 Deflector for
all
cutting tools
without
skirt
and
line limiting blade
19
Stop for circular saw blades
Handles:
20 Loop handle
21
Loop handle
with
22 Standoff lever
23 Bike handle
18
Carrying straps:
24
Shoulder strap recommended
25 Shoulder strap
26 Full harness recommended
27 Full harness
A fully equipped brushcutter comprises,
among other items:
- Cutting tool
- Deflector
- Handle
- Carrying strap
Select the
correct
combination
from
the table
according
to
the
cutting
tool
you
intend
to
use:
For safety reasons, you may only combi-
ne
the cutting tool, deflector, handle and
carrying strap versions shown when you
read the table
horizontally
from left
to
right
Other
combinations,
e.g. reading the
table diagonally, are
not
permitted
since
there is
otherwise
a
risk
of
':-
serious
injury.
Warning'
STIHL brushcutters with a loop handle
without
standoff
lever may
be
used
only with
the
above-mentioned mowing
heads with nylon line or plastic blades.
Other plastic or metal cutting tools may
only
be
used
on
brushcutters with a bike
handle, "J"-handle or loop handle
with
standoff
lever
in
order
to
minimize the
risk of personal injury through contact
with the cutting tool.
Cutting tools
Deflectors
Handles
Carrying straps
2
0
20~
~---'
15
3
4~
21
~
~
-
5
6
22
24
16
7
8
23
V
~l
t-J
(e'
'C(
~
.....
-
9
25
10
11
21
~
)
-:1
--
\
18
~
.~
--..../J
22
12
23
V
A
I
...."
25
26
19
~
13
14
~
23
V
0
(:)
=
27
19
Mounting the Bike Handle
12
11
12
3
3
,
4
i
I I I I
~
5
~
8
6
§
J
7
.10
The handle support (2) is mounted on
the drive tube (1).
• Take out the 4 screws
(3) -
remove the clamp (4).
• Place the bike handle
(5)
in
the and
position the clamp
(4) on the handle
support.
• Line up holes
in
clamp and
handle support.
• Insert the screws as far as stop.
• Line up the bike handle.
•
Tighten the screws firmly.
Fitting the control handle
• Remove the screw
(6)
from the nut (7).
• Take both parts out of the
control handle (8).
• Push the control handle
onto the bike handle
(5) -
throttle trigger (9) must
point
in
direction of gear head.
• Line up the holes
(10).
• Fit nut and screw
in
the
control handle.
•
Tighten the screw firmly.
Fitting the throttle cable
Do not kink the throttle cable
- make sure the throttle trigger
moves freely.
• Push the throttle cable
(11)
iAto the retainers (12).
20
Mounting Loop Handle with
Standoff Lever
~
-A-
,......,
1
~
~.
0
~
0
2
r
~
c.2..
~
•
Mount
the
loop
handle
(1) with
standoff lever 20 cm/8"
(A)
forward
of the control handle (2).
3 3
[] []
oJ
-l
I
I
1
1
--
1
I
I I 4 I I
lQJ
lQj
I
~
<:¢fIlII!
41
3
3
• Insert square nuts (3)
in
the
standoff lever (4) -
line up the holes.
( 4
On
FS 108
• Place the clamp (5)
in
the loop
handle (1) and position them both
against the drive tube (6).
• Fit the clamp
(7) and place standoff
lever (4)
in
position -
line up the holes.
•
Ir)selfscrews (8)
in
holes and
screw them into standoff lever
fingertight.
• Align the loop handle.
• Tighten the screws firmly.
21
4
On FS 88
• Place the clamp (5)
in
the loop
handle (1).
•
PlaE:e
packing sleeve (7)
on the drive tube (6).
• Fit the clamp
(8) and place standoff
lever
(4)
in
position -
line up the holes.
• Insert screws
(9)
in
holes and
screw them into standoff lever
fingertight.
• Align the loop handle.
• Tighten the screws firmly.
22
Mounting the Loop Handle
Version A
At;)
A
1
o
o
• Mount the loop handle (1)
20 cm/8"
(A)
forward of the
control handle (2).
On FS 108
• Place the clamp (3)
in
the loop
handle
(1) and position them both
against the drive tube
(4)
• Fit the clamp (5) -
line up the holes.
• Insert screws
(6)
in
holes and
~.
screw on the nuts (7) fingertight.
• Align the loop handle.
• Lock the nuts and tighten
the screws firmly.
~0
3
4 5
~6
8
([JJ
([JJ
8
On
FS 88
• Place the clamp (3)
in
the loop
handle (1).
• Place packing sleeve
(5)
on the drive tube (4).
• Fit the clamp
(6) -
line up the holes.
• Insert screws
(7)
in
holes and
screw on the nuts
(8) fingertight.
• Align the loop handle.
• Lock the nuts and tighten
the screws firmly.
Mounting
the
Loop
Handle
Version B
• Mount the loop handle (1)
20 cm/8"
(A)
forward of the
control handle (2).
• Place the clamp
(3)
in
the loop
handle (1).
On FS 88
• Place packing sleeve (5)
on the drive tube (4).
"'-
On FS 108
• Place both parts on the
drive tube (4).
• Fit the clamp
(6) and make sure
that the holes line up.
• Insert the screws
(7) as far as stop.
• Line up the loop handle and
tighten the screws firmly.
23
Mounting
the
Deflector
1
3~
4
Mounting the deflector
• Place either deflector (1) for all
cutting tools
or
deflector (2) for mowing heads
on the gearhead flange.
• Fit the plate
(3) and line it up.
• Insert M 5 x 18 screws and tighten
down securely.
24
Fitting skirt and blade
• Slide the lower guide slot of the
skirt
(4) over the deflector (1) -
it must snap into position.
• Push blade
(5) into the upper gUide
on
the skirt and line it up with the
first hole.
• Fit the screw and tighten
it
down
firmly.
Fitting stop -
for circular saw blades
• Remove standard deflector.
Place the stop
(1) on the gear
head flange - fit the three
M 5 x 18 screws
(2) provided
and tighten down securely.
Mounting the Cutting Tools
8
6 \
f
\
\
1 t
[
• Lay your brushcutter on its back
with the gear head facing up.
Blocking the output shaft
• Insert stop pin (1) in the bore (2) at
the side of the gear head as far as
stop - apply slight pressure.
• Rotate output shaft until the stop
pin slips into position and blocks the
shaft.
Removing cutting tool mounting
hardware
• Position combination wrench (3)
on the mounting nut (4).
• Release and unscrew the nut
clockwise (left-hand thread).
• Remove shipping keeper
(5) -
if fitted.
• Pull the rider plate
(6) and
thrust washer
(7) off
the shaft (8).
• Now fit the cutting tool.
25
STIHL Supercut 2-2
STIHL Supercut 20-2
• Lay your brushcutter on its back
with the gear head facing up.
• Screw mowing head counterclock-
wise onto the output shaft
(1) -
as far as it will go.
• Block the output shaft.
• Tighten down the mowing head
securely.
Important!
Remove the stop pin.
Keep instruction sheet for mowing
head in a safe place.
26
Removing mowing head
• Block the output shaft.
• Unscrew mowing head clockwise.
Adjusting nylon line
• Fresh line
is
advanced auto-
matically, providing at least
6cm/2.4" of line
is
still projecting
from the head.
Blade on deflector trims surplus line
to correct length.
• Fit new nylon line as described
in
instructions supplied with mowing
head.
STIHL Autocut 25-2
STIHL Autocut 30-2
• Lay your brushcutter
on
its back
with the gear head facing
up.
• Screw mowing head counterclock-
wise onto the output shaft
(1) -
as far as
it
will go.
• Block the output shaft.
--.
Tighten down the mowing head
securely.
Important!
Remove the stop pin.
Removing mowing head
• Block the output shaft.
• Unscrew mowing head clockwise.
Keep instruction sheet for mowing
head in a safe place.
Adjusting nylon line
• Hold the rotating mowing head
horizontal above the ground -
tap
it
on the ground -
about
3cm/1 1/4" fresh line
is
advanced - blade on deflector trims
surplus line
to
the correct length -
avoid tapping head more than
once.
• Line feed operates only if both lines
still have a
minimum length
of
2.Scm/1".
• Fit new nylon line as described
in
instructions supplied with mowing
head.
c;-
2
1
3
4
"c
I~
STIHL Autocut 24-2
STIHL
Polymatic 30-2
• Lay your brushcutter on its back
with the gear head facing up.
• Slip the plain washer
(1) and
thrust washer
(2) over the
shaft
(3) and against the
thrust plate (4).
• Screw mowing head counterclock-
wise onto the output shaft -
as far as
it
will go.
• Block the output shaft.
• Tighten down the mowing head
securely.
Important!
Remove the stop pin.
Keep instruction sheet for mowing
head in a safe place.
Removing mowing head
• Block the output shaft.
•
Uns.f.rew mowing head clockwise.
Adjusting nylon line
• Refer to instruction sheet supplied
with mowing head.
27
1
~4
-=
2
STIHL Polycut 40-3
STIHL Fixed Line Head
•
•
•
•
•
•
Lay your brushcutter on its back
with the gear head facing up.
Remove ring (1) from the mowing
head.
Position the head on the thrust
plate (2).
Slip the thrust washer (3) over the
output shaft (4).
Block the output shaft.
Screw mounting nut (5) counter-
clockwise on to the output shaft and
tighten
it
down firmly.
Important!
Remove the stop pin.
Releasing mounting nut
• Block the output shaft and
unscrew the mounting nut
clockwise.
If
the mounting nut becomes slack due
to frequent loosening and retightening,
fit a new one.
Replacing cutting blades
• Refer to instruction sheet supplied
with fixed line head.
•
•
•
....,. .
•
Lay your brushcutter on its back
with the gear head facing
up.
Place mowing head on the thrust
plate (1).
Slip the thrust washer (2)
over the output shaft (3).
Block the output shaft.
Screw mounting nut (4) counter-
clockwise on
to
output shaft and
tighten down securely.
Important!
Remove the stop pin.
Keep instruction sheet
for
mowing
head in a safe place.
28
Keep instruction sheet
for
mowing
head in a safe place.
t
l
Releasing mounting nut
• Block the output shaft.
• Unscrew the mounting nut
clock wise.
If
the mounting nut becomes slack due
to
frequent loosening and retightening,
fit
a new one.
Fitting nylon line
• Refer to instruction sheet supplied
with fixed line head.
Grass cutting blade 230
Brush knife 250
Note:
Remove skirt and blade from
deflector before mounting these
cutting tools.
• Lay your brushcutter on its back
with the gear head facing up.
• Place cutting tool
(1) on the thrust
plate (2).
• Cutting edges of blade 230-8
(3)
must point clockwise.
• Cutting blade 230-4
(4) and brush
knife
(5) may be fitted either way
round.
• Slip the thrust washer
(6)
and rider plate (7) over
the output shaft (8).
• Block the output shaft.
• Screw mounting nut
(9) counter-
clockwise on to output shaft and
tighten down securely.
Important!
Remove the stop pin.
Releasing mounting nut
• Block the output shaft.
• Unscrew the mounting nut
clockwise.
If
the mounting nut becomes slack due
to
frequent loosening and retightening,
fit a new one.
29
@8
[
\6
::==::...,
5
3
7
4
Circular saw blade 200
(chisel and scratcher tooth)
Fit the appropriate stop
before mounting circular saw blade.
Fitting the stop see chapter "Mounting
the Deflector".
30
Mounting circular saw blade
• Lay your brushcutter on its back
with the gear head facing up.
• Position saw blade
(3) on
the thrust plate
(4) -
teeth must point
in
clockwise
direction.
• Slip the thrust washer
(5)
and rider plate (6) over
the drive shaft
(7).
• Block the drive shaft.
• Screw mounting nut
(8)
counterclockwise on to
drive shaft and tighten down
securely.
Releasing mounting nut
• Block the drive shaft and
unscrew the mounting nut
clockwise.
If
the mounting nut becomes slack due
to frequent loosening and retightening, fit
a new one.
Fuel
Your
two-stroke engine requires a
mixture of brand-name gasoline and
quality two-stroke engine oil with the
classification Te.
Use regular branded unleaded gasoline
with a minimum octane number of
90 ROZ (U.S.A./Canada: pump octane
min. 89!).
If
the octane number of the
regular grade gasoline
in
your area is
lower
us5=l
premium unleaded fuel.
Fuel with a lower octane number may
result
in
preignition (causing pinging")
which
is
accompanied by an increase
in
engine temperature. This,
in
turn,
increases the risk of the piston seizure
and damage to the engine.
The chemical composition of the fuel
is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason
it
is
essential that you use only
name branded fuels!
Use only STIHL two-stroke engine oil or
equivalent branded two-stroke air-cooled
engine oils with the classification TC for
mixing.
We recommend STIHL
50:1
two-stroke
engine oil since it is specially formulated
for use
in
STIHl
engines. The mix ratio
with
STIHl
oil
is
50:1
(50 parts gasoline
to 1 part oil), or
25:1
(25 parts gasoline to
1 part oil) with other branded two-stroke-
air-cooled engine oils.
Do not use BIA or
TCW
(two-stroke
water cooled) mix oils!
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed
in
order to avoid any moisture
getting into the mixture.
The fuel tank and the canister
in
which
fuel mix is stored should be cleaned
from time to time.
Fuel mix ages:
Only mix sufficient fuel for a few days
work, not to exceed 30 days of storage.
Store
in
approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Gaso- STIHL Other branded
line engine oil
TC
oils
50:1
25:1
Liters Liters
(cc)
Liters (cc)
1
0.02 (20) 0.04 (40)
5 0.10 (100) 0.2 (200)
10 0.20 (200)
OA
(400)
15
",:-0.30 (300) 0.6
(600)
20
OAO
(400) 0.8 (800)
25 0.50 (500) 1.0
(1000)
Gaso- STIHL Other branded
line engine oil TC oils
50:1
25:1
US gal.
US fl.oz US fl.oz
1
2.6
5.1
21/2
6A 12.8
5
12.8 25.6
31
Fueling
Fitting
the
Harness
Before fueling, clean the filler cap and
the area around it
to
ensure that no dirt
falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your machi-
ne.
Change the fuel pick up body every year.
Before storing your machine for a long
period, drain and clean the fuel tank and
run engine until carburetor is
dry.
Models with a loop handle come without
a harness (available as special acces-
sory for these models).
Shoulder strap
Use of the carrying strap is described
in chapters "Safety Precautions" and
"Selecting the Cutting Tool".
Warning!
In
order to reduce the risk of
bums or other personal injury from esca-
ping gas vapor and fumes, remove the
fuel filler cap carefully so as to allow any
pressure build-up
in
the tank
to
release
slowly.
Warning' After fueling, tighten fuel cap
as securely as possible by hand.
32
•
...., .
Put on the shoulder strap (1).
Adjust length until the spring
hook (3) rests against your right hip.
Full
harness
• Put on the full harness (2).
• Adjust length until the spring
hook (3) rests against your right hip.
Use of the carrying strap is described
in
chapters "Safety Precautions" and
"Selecting the Cutting Tool".
Balancing the brushcutter
• Attach the spring hook
(3)
to
the clamp (4) on the drive shaft -
slacken the screw (5).
• Slide the clamp up or down
the drive shaft.
•
Tighten the screw moderately.
• Let go of the brushcutter and check
to
see how
it
is balanced:
mowing heads, Fixed Line Head
and
brush knife must rest lightly
on
the
ground.
Circular saw blades must stay
abottt 30cm/1
ft
(A)
clear of the
ground.
•
Tighten the screw firmly.
33
Starting
1
• Observe safety precautions - see
section "Safety Precautions"
in
this
manual.
• Hold down the throttle trigger
interlock (1) and squeeze
the throttle trigger (2).
• Move the slide control (3)
to
START position.
• Now release the throttle trigger, slide
control and trigger interlock
in
that order = This
is
the
starting-throttle position.
34
If engine
is
cold:
Set the choke lever (4) to
.L
If
engine
is
warm:
Set the choke lever (4) to ...
Also use this setting il engine has been
running but
is
still cold.
• Put the unit on the ground:
It
must rest securely on the engine
support and deflector. Check that
the cutting tool
is
not touching the
ground or any other obstacles.
• Make sure you have a firm
looting: Hold the unit with you left
hand and press it down
firmly -
your thumb should
be
under the
housing.
• Do not stand or kneel
on
the drive
shaft!
~oo~
((
\\3))
2
• Pull the starter grip slowly with your
right hand until you feel
it
engage -
and then give
it
a brisk strong pull.
Do not pull out starter rope more
than 70cm (27") -
it
might break.
Do not let the starter grip snap
back - guide
it
slowly into the
housing so that the starter rope
can rewind properly.
When engine begins to fire:
If
engine is cold:
Set choke lever (4)
to
-
and continue cranking until engine runs.
If
engine
is
warm:
Continue cranking until engine
runs_
As soon as warm engine runs:
• Blip the throttle trigger (2) -
the slide control (3) moves to the
run
position
I,
and the engine
returns
to
idling speed.
•
Make~ure
carburetor is correctly
adj,usted - cutting tool must not
rotate when engine
is
idling.
Your brushcutter
is
ready for
operation.
35
To
shut down engine:
• Move slide control (3)
to
STOP.
At very low outside temperatures:
Allow engine to warm up
As soon as engine runs:
• Blip the throttle trigger-
the slide control
(3) moves to the
run position
I, and the engine
returns to idling speed.
• Open throttle slightly -
warm up engine for short period.
36
If the engine doesn't start:
If
you did not move the choke
lever
to.L
quickly enough after the engine
began to fire, the combustion chamber
is flooded.
Remove spark plug terminal
(5) -
• Unscrew and dry off the
spark plug.
• Set slide control
to
STOP.
• Open the throttle fully.
• Pull the starter rope several times to
clear the combustion chamber.
• Refit the spark plug and connect
the spark plug terminal.
• Set slide control to START.
• Set choke lever
to
...
even if engine
is
cold.
•
Now
start the engine.
Fuel tank run until dry and then
refueled
• Continue cranking -
Engine will not start immediately
because fuel pump has to be pri-
med with fuel.
Adjusting Carburetor
FS88
{ I I
FS
88
/
I I
t L
/-1=1
rL
rB
I
~~
R
I
~~
~
IfF
~l~
1~!
I
L-!@
~LA
L....
~
FS
108
I
{ I I
FS 108
I , I
H L
JJ
~~
~I-R~-
LD
The carburetor has been adjusted for
optimum performance under the
barometric pressure and climatic
conditions at the factory.
Basic setting
This setting
is
the starting point for fine
tuning and can be used as the
standard setting.
• Check air filter and clean it if
necessary.
• Carefully screw the high speed
adjusting screw (H) and low speed
adjusting screw (L) down onto their
seats (clockwise) and make the
following adjustments:
H Open 1 full turn
L Open 1 full tum
• Start the engine and adjust idling
speed with the idle speed adjusting
screw
LA
or LD:
cutting tool must not rotate.
This standard setting
is
the optimum
setting
of
the high speed adjusting screw
for normal operation at an altitude of
about 300 m/1000
It above sea level.
It
ensures your machine will deliver
maximum power, be fuel efficient and
operate reliably.
It
may be necessary fine-tune the
carburetor
if
operating
conditions
change,
e.g. higher or lower altitudes, extreme
changes
in
humidity and temperature or
if
you
fit
a different cutting tool:
The fine tuning procedures described
below ensure maximum performance
under
t~e
new
operating conditions.
37
FS
88
I
, ,
FS88
I
! ,
~H
Iii
H
Ir I
I~@
,~
R
,
n
~I
ILL
1'-1
@
1Pr=
I--
II
l-
I
I
-------
---
FS
108
( I ,
FS 108
( I ,
Fine tuning
• Mount the cutting tool.
Machines with cutting head:
• Trim line to correct length:
Lines must extend as far as line
limiting blade on the deflector
• Carry out the basic setting.
• Warm up engine by running
it
for
about 1 minute at full throttle and
then return
to
idle speed.
• Back off high speed adjusting screw
(H) one half turn (counterclockwise).
• Run engine at full throttle and rotate
high speed adjusting screw
(H)
carefully clockwise until you hear
38
no further increase
in
RPM -
back off screw one eighth turn.
Machines with metal cutting tool:
A tachometer is necessary for the
following adjustment.
If
no tachometer
is
available,
.....,.
do not turn screws beyond the basic
setting.
• Carry out the basic setting.
• Warm up engine by running
it
for
about 1 minute at full throttle and
then return to idle speed.
• Back off high speed adjusting screw
(H) one half turn (counterclockwise).
• Run engine at full throttle and
rotate high speed adjusting screw
(H) carefully clockwise until
maximum permissible speed of
12,000 RPM
is
reached.
Turning the screw
(H) any further
in the clockwise direction will
make the fuel-air mixture too
lean -
this could damage the engine!
FS 88
, ,
,
L
rH
I@f;j
I
R
I I
Lj~
Iii
L-
LA
~
FS88
I
I !
L
rH
I@f;j
I
R
I
117=1
l-/~
L-
LA
~
FS88
(
I I
L
rH
)@f;j
R
I
117=
l-/@
L-
I
------
FS 108
( I I
FS 108
( I I
FS 108
( I I
Adjusting idle speed
It
is usually necessary to change
the setting of the idle speed
adjusting screw
(LA or LD) after every
correction
to
the low speed
adjusting screw
(L).
Engine stops while idling
Turn the idle speed
adjusting screw
(LA or LD)
clockwise until engine runs
smoothly - cutting
tool must not rotate.
Cutting tool rotates when
engine is idling
Turn the idle speed adjusting
screw
(LA or LD) counterclockwise
until cutting tool stops rotating -
then back off screw about
another one half tum from that
position.
Erratic idling behavior,
poor acceleration
Idle setting is too lean.
Turn the low speed adjusting
screw
(L) counterclockwise until
engine runs and accelerates
smoothly.
Exhaust smokes at idle speed
Idle setting is too rich.
Turn the low speed adjusting
screw
(L) clockwise until
engine speed drops. Then turn
screw back one quarter turn
and
ch~k
that engine still
acce'lerates smoothly when
you open the throttle.
39
Operating
Instructions
During break-in period
A factory new machine should not be
run
at
high revs (full throttle off load) for the
first three tank fillings. This avoids un-
necessary high loads during the break-in
period.
As all moving parts have
to
bed
in
during the break-in period, the
frictional resistances
in
the engine
are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
40
During operation
After long period of full-throttle
operation, allow engine
to
run
for a while
at
idling speed so that the heat
in
the
engine can be dissipated by flow of
cooling
air.
This protects engine-
mounted components (ignition,
carburetor) from thermal overload.
After finishing work
Storing for short period:
To
avoid condensation, fill the fuel
tank and keep the unit
in
a dry place
until you need
it
again.
Storing for a long period:
Drain and clean the fuel tank -
run engine until carburetor is
dry.
Check tightness of nuts and screws
(not adjusting screws) at regular
inteNals and retighten as necessary.
Checking Spark Plug
Cleaning Air Filter
1
(~2
---\(~
'-=~=======*
A
':5
8
..:
1Il
g
o
If
engine
is
down on power, difficult
to
start or runs poorly at idling speed,
first check the spark plug.
• Remove spark plug -
see "If engine doesn't start:"
• Clean dirty spark plug.
• Check electrode gap -
it
should be 0.5 mmlO.020"
(A)
-
readjust
if
necessary.
• Use only suppressed spark plugs
of the approved type.
Rectify faults which have caused
fouling of spark plug:
Incorrect carburetor setting, too much oil
in
fuel mix, dirty air filter, unfavorable
running conditions, e.g. operating at
part load.
• Fit a new spark plug after
approx. 100 operating hours -
or earlier if the electrodes are
badly eroded.
•
If there
is
a noticeable loss
of engine power:
• Set choke lever to
.L -
• Grip tab (2) and pull the
filter cover
(1) off the carburetor.
• Clean away loose dirt from
around the filter.
41
Lubricating
Gearbox
Lubricating
Drive
Shaft
01
10
2
t
5
3 4
•
Remove the foam element (3)
•
Check grease level after about
•
Check film of lubricant once
and the felt element (4).
every 50 hours of operation.
a year.
•
Wash the filter elements
in
fresh,
•
Unscrew the filler plug (1).
non-flammable cleaning solution
•
If
no grease can be seen on the insi-
•
Mark the end of the gear head on
(e.g. warm soapy water) and then
de
of the filler plug, screw the tube
the drive tube.
dry.
(2) of STIHL gear lubricant
•
Release the clamp screws (1).
0781 120 1117 into the filler hole.
•
Pull the gear head (2) off the
Replace damaged parts of filter.
•
Squeeze grease into the gear drive tube.
housing
- about 5 - 10 g (1/4 oz),
•
Place the felt element
in
the filter base (5) first and then Do not completely fill the
the foam element.
gear housing with grease.
•
Fit the filter cover (1) -
it
must snap
into position.
•
Refit the filler plug and tighten
it
down firmly.
42
Sharpening
Cutting
Tools
D
3
1
':)
2
(")
"'
0
«
([J
r--
"'
(")
o
3
• Resharpen only when all cutting
edges (1)
on
both sides of the
blade are dull: This ensures
balanced wear.
Grass cutting blade 230-4
Never straighten or weld a bent or
cracked cutting blade -
it
might
shatter and cause serious or fatal injury.
o
• Push shaft (3) into the drive tube -
tum it
to
and fro until distance A
is
less than 30mm (1.2").
• Slide the drive tube into
the gear head
-
turn drive shaft (4) back and
forth until mark is reached.
• Line up the gear head.
•
Tighten down the clamp screws.
•
If
shaft has turned blue, fit a
new one.
• Pull the shaft
(3) out of the drive
tube.
• Use STIHL multipurpose grease
0781
120 1109 to coat dry areas
of the shaft:
Do not apply too much grease
-
never pump grease into the
drive tube.
t
~3
':)
'"
"'
0
«
([J
r--
"'
(")
To
avoid out-at-balance:
• Resharpen the cutters
(2)
uniformly - do not alter the contour
of the parent blade (3)
in
any
way.
• After resharpening about 5 times,
have blade checked on STIHL
balancer 5910 850 2600 and
rebalanced as necessary.
43
~A
o
~c
m
B
~
,---~-----a'i
:;:;
..,
3
2
=:JJ
.......
__
4
__
Sharpen correctly
•
If
slightly dull:
Use flat file (4) 0814 212
3310-
In
case of more serious wear or
nicks: Resharpen with a grinder -
maintain a sharpening angle of
30° (A) on the cutting edge (1).
• File back the cutting edge
parallel to the lines (B) (see
illustration).
• Resharpen frequently, take
away as little material as
possible - two or three strokes
of
the file are usually enough.
44
Grass cutting blade 230-8
Never straighten
or
weld a bent or
cracked cutting blade -
it
might
shatter and cause serious
or
fatal injury.
• Resharpen when the tips of the
cutting edges (1) have worn
down to about 1mm/3/64" (A).
To
avoid out-of-balance:
• Resharpen the cutters (2)
uniformly - do not alter the contour
of the parent blade (3) in any
way.
• After resharpening about 5 times,
have blade checked on STIHL
balancer 5910 850 2600 and
rebalanced as necessary.
Measurements and angles for
resharpening
Leave clearance of 2mm/5/64" (B)
between cutting edge and parent
blade -
R1
should be 2mm/5/64".
Radius R2
is
2.5mmf7164" and
is
obtained automatically if you use the
specified file and maintain a filing angle
of 30° (C).
Cutting edge
(0) must be exactly
in
line
with center of blade's mounting hole.
)J
4_-
2
2
Sharpen correctly
•
If
slightly dull:
Use flat file
(4) 0814
2123310-
In
case of more serious wear or
nicks: Resharpen with a grinder.
• File back the cutting edge
parallel to the lines
(E)
(see illustration).
• Resharpen frequently, take
away as little material as
possible - two or three strokes
of the file are usually enough.
Brush knite
250
Never straighten or weld a bent or
cracked brush knife -
it
might shatter
and cause serious or fatal injury.
• Only sharpen the
cutting edges
(1) at the pointed
tips - do not sharpen curved
cutting edges
(2) even if theyare
nicked
in
places.
To
avoid out-at-balance:
• Resharpen cutting edges
uniformly -
use the sharpening template
0457 342 2629 provided.
• After resharpening about
5 times, have blade checked on
ST-U::iL
balancer
59108502600
and rebalanced as necessary.
45
)n
3-
Sharpen correctly
•
If
slightly dull: Use
flat file (3) 0814 212
3310-
In
case of more serious wear
or
nicks: Resharpen with a grinder -
maintain a sharpening angle of
30
0
(A) on the cutting edge (1).
• File back the cutting edge
parallel to the lines on the sharpen-
ing template.
• Resharpen frequently, take
away as little material as
possible - two or three strokes
of the file are usually enough.
46
ay
I !
~)
I
'--.-:
-,
-,I
\
\
Circular saw blade 200 (chisel tooth)
Never straighten
or
weld a bent
or
cracked circular saw blade - it might
shatter and cause serious
or
fatal injury.
Sharpening circular
saw
blade on the unit
• Cut a vertical slit
in
the
top of a tree stump
- lean the unit
against the stump so that the saw
blade rests in the slil.
• Turn the blade with one hand
while resharpening
-
Wear gloves!
Sharpen correctly
• File only the side plate (1).
•
If
slightly dull: Use
file holder (2) 5605 750 4343
and matching 5.5mm dia.
round file (3)
0811
411
8108.
l0
case of major
or
very irregular wear:
Use an electric grinder.
• File right and left-hand teeth
in
the direction of sel.
5 4
B~
• File at the angle marked on the file
holder:
Filing angle
is
15°
(A)
-
file should slope upward
at an angle of 5° (B).
• Resharpen frequently, take
away as little material as
possible - two or three strokes
of the file are usually enough.
Resetting the teeth
If
the saw blade does not cut freely
or binds
in
the cut:
Check set of teeth -
• Hold the saw set
(4) 4020 893 5000
against the saw blade
(5) - if there
is a gap
(C)
between the tooth and
saw set: see "Resetting the teeth".
•
If
the tooth just touches the saw set:
Clearance
0
is
1mm (3/64") and the
set
is
correct.
Resetting correctly the teeth
• Fit notch of saw set
(4) over the
tooth
(6) - blade thickness 1.5mm
(about 1/16"). Maintain the angle
of 90°
(E) and keep
to
existing
direction of set.
• Push the saw set downward until
the sloRing side
(F) of the notch
"',
butts,against the saw blade.
• Check set of teeth again.
Circular
saw
blade 200
(scratcher tooth)
Never straighten or weld a bent or
cracked circular saw blade -
it
might
shatter and cause serious or fatal injury.
47
Replacing
Starter
Rope
and Rewind Spring
2
~
0
0
5
'-6
0
]ID
__
2_-
Sharpen correctly
• File only the back of the tooth (1).
• If slightly dull: Use
flat file (2) 0814 212 3310.
In
case of more serious wear or
nicks: Resharpen with a grinder -
until
the tips (3) of the teeth are
restored to full sharpness.
• Resharpen frequently, take away
as little material as possible - two or
three strokes of the file are usually
enough.
• Do not alter tooth profile.
Removing rewind starter
• Lay your brushculler on its back
with the gear head facing
up.
• Remove the four screws (1) from
the machine support (2) and lift
it
away.
• Take out the screws (3).
• Remove the starter cover
(4)
together with rewind starter
mechanism.
Replacing a broken starter rope
• Take out the screw (5).
• Remove the washer (6).
• Remove the rope rotor very
carefully - the rewind spring
is
seated
in
the starter cover and
may pop out and cause injury if
care is not taken.
48
• Remove remaining rope from rotor -
thread the new rope -
3.5mm x 800mm (0.14" x 31.5") -
into the rotor and secure
it
with a simple overhand knot.
• Thread other end - from
inside - through the rope guide bush
in
the starter cover and the undersi-
de of the starter grip and secure
with special knot (7).
• Coat rope rotor bearing bore
with non-resinous oil.
• Slide rotor onto starter post -
turn
it
back and forth until
anchor loop
(8) of rewind spring
engages.
• Fit screw and washer and tighten
down firmly.
Go to "Tensioning rewind spring".
a=2mm
(O,08in)
Replacing a broken rewind spring
• Lubricate the new spring with a few
drops of non-resinous oil -
do not open the wire retainer!
• Remove the rope rotor - as
described
in
"Replacing a broken
starter rope".
•
Rei'tlove parts of old spring.
• Fit the new spring -
position outer spring loop
in
the
recess - the wire retainer slips off
in
this process.
49
o
o
If the spring has popped out and
uncoiled:
• Wind up the spring clockwise, from
the inside outwards, until its overall
diameter is
50mm
(2").
• Use pointed nose pliers to grip
spring about 10mm
(318")
from the
outer loop and refit
it.
• Install the rope rotor.
50
Tensioning the rewind spring
• Make a loop
in
the starter rope and
use it to turn the rope rotor seven
full revolutions counterclockwise.
• Hold the rotor steady - straighten
the twisted rope - release the rotor.
• Let go of rope slowly so that
it
winds onto the rotor.
The
starter grip must be firmly seated
in
the rope guide bush.
If grip droops to one side:
• Add one more turn on rope rotor
to increase spring tension.
When
starter rope is fully extended it
must be possible to rotate the rotor
'-
another half turn.
• If this is not the case, the spring
is overtensioned and could break.
• Take one turn of rope off the rotor.
• Refit and secure the starter cover
and machine support.
Spark
Arresting
Screen
in
Muffler
Storing
the
Machine
1/
4
\
4
1(. I
•
0
l.1
•
4
4
II
\
~
(0
I
0
I 5
]
lo
I
0
If
the engine
is
low on power, check the
spark arresting screen inside the muffler.
• Pull off the spark plug
terminal (1).
• Take out shroud mounting
screws (2).
• Remove the shroud (3).
• Take out the screws (4).
• Remove the cover (5).
• Remove the spark arresting
screen (6).
• Clean spark arresting screen
if
necessary.
•
If
screen
is
damaged or coked up,
fit a new one.
• Refit the spark arresting screen.
• Fit the cover.
• Fit the shroud.
For periods of about 3 months or longer:
• Drain and clean the fuel tank.
• Run engine until carburetor
is
dry -
this helps prevent the carburetor
diaphragms sticking together.
• Remove, clean and inspect the
ClLtting
tool.
• . Thoroughly clean the machine -
pay special attention
to
the cylinder
fins and air filter.
• Store the machine
in
a
dry,
high or
locked location - out of the reach
of children and other unauthorized
persons.
51
Maintenance Chart
Please note that the following maintenance intervals apply for normal operating
conditions only.
If
your daily working time
is
longer than nonmal or conditions
g.?-
a.
are difficult (very dusty work area, etc.), shorten the specified intervals accordingly.
-c
0
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0
E"(ij
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;:
","0
<1>
~
Q;
;§o
u'"
>-
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'"
~.~
Olc
>-
£
Ol
<1>=
:c
E
(J
Ol
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~<1>
:i:
C
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~
a.
Ot:
<1>
Ol
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<1>
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'"
<1>
.0'"
Ol
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Ol~
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.- .-
ro
<J)
Complete machine
Visual inspection (condition, leaks)
x x
Clean
x
Control handle Check operation
x
x
34-36
~~
Air filter
Clean
x
x
41-42
Replace
x
41-42
r--
Check
32
Filter in fuel tank
x
Replace
x
32
Fuel tank Clean
I x
31
Check idle adjustment -
Carburetor
cutting tool must not turn
x x
37-39
Readjust idle
x
37-39
Spark plug Readjust electrode gap
x
41
Cylinder fins Clean
x
Spark arresting screen
in
muffler
Inspect
x
I
51
Clean or replace
x x
51
All accessible screws and nuts
(not adjusting screws)
Retighten
x
40
Visual inspection
x
x
26-30
Cutting tools
Replace
x
26-30
Sharpen metal cutting lools
x
43-48
Check tightness of cutting tool
x
26-30
Check
~
42
Gearbox lubrication
Top up
x
42
Drive shaft lubrication
Check
42-43
Replenish
x
42-43
52
The user of the brushcutter may carry
out only the maintenance operations
described
in
this manual. Other repair
work may
be
performed only
by
an
au-
thorized STIHL Service Shop.
warranty claims following repairs can
be accepted only if the repair has
been performed by an authorized
STIHL Service Shop using original
STIHL spare parts.
Original STIHL parts can
be
identified by
the
STIHL part number, the logo
STIHC
and the STIHL
parts symbol
lSI",.
The symbol may
appear alone
on
small parts.
Specifications
Engine
Single cylinder two-stroke engine
Model FS 88 FS 108
Displacement: 25.4 cm
3
34.4cm
3
(1.55cu.in)(2.10cu.in)
Bore: 34 mm 37 mm
(1.34 in) (1.46 in)
Stroke: 28 mm 32 mm
(1.10 in) (1.26
in)
Engine power: 0.9 kW
1.1
kW
(to ISO 8893) (1.2 bhp) (1.5 bhp)
Max. permissible engine speed
with metal cutting tool (rpm):
12,000 12,000
Max. output shaft speed (tool moun-
ting)(rpm):
8800
9000
Idle speed (rpm):
2800
2 800
Ignition System
Fuel System
Carburetor:
All position diaphragm carburetor
with integral fuel pump
Air filter:
Foam and felt elements
Fuel tank capacity:
0.69 I (1.45
US
pt)
Fuel mix:
see chapter "Fuel"
Weight
without cutting tool
and deflector:
Type:
Electronic (breakerless)
magneto ignition
Spark plug
(suppressed):
Electrode gap:
Spark plug thread:
Bosch WSR 6 F
or
NGK BPMR 7A;
Heat range 200
0.5 mm (0.02 in)
M 14 x 1.25;
9.5 mm long
(0.37 in)
FS
88 with bike handle
FS
88 with loop handle
FS 108 with bike handle
FS
1-08
with loop handle
6.5
kg
(14.31b)
5.9
kg
(13.0Ib)
7.1
kg
(15.6Ib)
6.5
kg
(14.3Ib)
53
~
Model Tool
Sound
Sound power Vibration
Vibration
I
pressure level L
weq
acceleration
acceleration
level L
peq
to
to
to
to
ISO 10884
1)
ISO 7916 ISO 7916
ISO 7917
1
)
Idle speed
Max. RPM
(m/s
2
)
(m/s
2
)
Handle
Handle
dB
(A)
dB
(A)
riQht
left
right
~
FS
88
2
)
Mowina head
98 109 2.7
2.4
41
5.7
FS
88
2
)
Metal tool
95 103
2.7
2.4 5.0
6.3
FS 88 R
3
)
Mowina head 98
109
2.5
2.0 6.3 6.3
FS
88 R 4)
Metal tool
95
103
2.5 2.0 9.4 6.7
FS
108
2
)
Mowina head
99
111
2.4 3.7 2.4 2.8
FS
108
2
)
Metal tool
96 105 2.4 3.7
2.1
2.5
FS 108 R
3
)
Mowina head
99
111
1.8 1.8 4.4
5.4
FS 108 R
4)
Metal tool
96 105 1.8 2.2
4.4
3.5
1)
2)
3)
4)
54
Weighted equivalent level includes idling and maximum RPM with the same
duration of exposure
Version with bike handle
Version with loop handle
Version with loop handle with standoff lever
Special
Accessories
Cutting Tools
12
Circular saw blade 200
Nylon line for mowing heads
(scratcher tooth) **
STIHL «Supercut 2-2»
41127134201
" 2.4mm/0.095"(orange) - for 1
to
8
4002 710 2140
15m/50ft 0000 930 2243
13
Circular saw blade 200
44m/144ft 0000 930 2244
2
STIHL «Supercut 20-2»
(chisel tooth)
..
87m/285ft 0000 930 2245
40027102162
41127134203
261
m/856ft 0000 930 2246
434m/1424ft 0000 930 2247
3
Mahkopf STIHL ·«Autocut 24-2»
40027102109
"2.7mm/0.105"(red) - for 7 and 8
4
STIHL «Autocut 25-2»
40027102108
10.7m/35ft 0000 930 2218
72m/236ft 0000 930 2224
5
STIHL «Autocut 30-2»
4002 710 2107
Thermoplastic blades
6
STIHL «Polymatic 30-2»
for 8
4002 710 2120
Pack of 12
41110071001
7
STIHL «Fixed Line Head»
40017132100
Transport guards
for 9 to
11
4119 790 3906
8
STIHL «Polycut 40-3»
for 12 and 13 4119 790 3901
4111
7102100
9
Grass cutting
blade 230-4 *
Other special accessories
4001 7133801
Shoulder strap
Full
b~mess
10 Grass cut1ing blade 230-8 *
Goggres
4001 713 3803
STIHL multipurpose grease
11
Brush knife 250-3 *
Not approved for FS 88 and
(80 g/3 oz tube) 0781 120 1109
41127134100
FS 108 with loop handle without
(225 gl8 oz tube) 0781 120 1110
standoff lever
STIHL gear lubricant
(80 g/3 oz tube) 0781 120 1117
Not approved for FS 88 and
(225 g/8 oz tube) 0781
1201119
FS 108 with loop handle
55
& WARNING!
The
engine exhaust
from
this product
contains chemicals
known
to
the
State
of California
to
cause
cancer.
birth
defects
or
other reproductive
harm.
englisch/english U.S.A.
… 48 …


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