FS 89, 89 R
2 - 38 Instruction Manual
English
Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Approved Combinations of Cutting Attach‐
ment, Deflector, Handle and Harness.......12
4 Mounting the Bike Handle.........................13
5 Mounting the Loop Handle........................15
6 Adjusting the Throttle Cable......................16
7 Fitting the Carrying Ring........................... 16
8 Mounting the deflector.............................. 17
9 Mounting the Cutting Attachment..............18
10 Fuel........................................................... 21
11 Fueling...................................................... 21
12 Fitting the Harness....................................22
13 Balancing the Machine..............................23
14 Starting / Stopping the Engine.................. 25
15 Transporting the Unit................................ 27
16 Operating Instructions...............................29
17 Replacing the Air Filter..............................29
18 Adjusting the Carburetor........................... 30
19 Spark Plug................................................ 30
20 Engine Running Behavior......................... 31
21 Lubricating the Gearbox............................31
22 Storing the Machine.................................. 31
23 Sharpening Metal Cutting Blades............. 31
24 Maintaining the Mowing Head...................32
25 Maintenance and Care..............................33
26 Minimize Wear and Avoid Damage...........35
27 Main Parts.................................................35
28 Specifications............................................36
29 Maintenance and Repairs......................... 37
30 Disposal.................................................... 37
31 EC Declaration of Conformity................... 37
1 Guide to Using this Manual
1.1 Pictograms
The meanings of the pictograms attached to the
machine are explained in this manual.
Depending on the model concerned, the follow‐
ing pictograms may be attached to your
machine.
Fuel tank; fuel mixture of gasoline
and engine oil
Operate decompression valve
Manual fuel pump
Operate manual fuel pump
Tube of grease
Intake air: Summer operation
Intake air: Winter operation
Handle heating
1.2 Symbols in text
WARNING
Warning where there is a risk of an accident or
personal injury or serious damage to property.
NOTICE
Caution where there is a risk of damaging the
machine or its individual components.
1.3 Engineering improvements
STIHL's philosophy is to continually improve all
of its products. For this reason we may modify
the design, engineering and appearance of our
products periodically.
Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual.
2 Safety Precautions and
Working Techniques
Because the machine 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 and
understand the User Manual before
commissioning and keep it in a safe
place for future reference. Non-com‐
pliance with the User Manual may
cause serious or even fatal injury.
Observe all applicable local safety regulations,
e.g. by trade organizations, social insurance
institutions, labor safety authorities etc.
If you have never used a power tool before:
Have your dealer or other experienced user
show you how to operate your machine – or
Original Instruction Manual
0000007281_013_GB
Printed on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG 2022
0458-460-0121-A. VA5.E22.
2 0458-460-0121-A
2 Safety Precautions and Working Techniques English
attend a special course to learn how to operate
it.
Minors should never be allowed to use the
machine – except for apprentices over the age of
16 when working under supervision.
Children, animals and bystanders must remain at
a distance.
When not using the machine, it must be laid
down in such a way that it does not endanger
anyone. Ensure that the machine cannot be
used without authorization.
The user is responsible for accidents or risks
involving third parties or their property.
Do not lend or rent your power tool without the
User Manual. Be sure that anyone using it under‐
stands the information contained in this manual.
The use of machines that emit noise may be limi‐
ted to certain hours of the day as specified by
national and/or regional or local regulations.
Anyone operating the machine must be well res‐
ted, in good physical health and in good mental
condition.
If you have any condition that might be aggrava‐
ted by strenuous work, check with your doctor
before operating a machine.
If you have a pacemaker: The ignition system of
your machine produces an electromagnetic field
of very low intensity. This field may interfere with
some pacemakers. STIHL recommends that per‐
sons with pacemakers consult their physician
and the pacemaker manufacturer to reduce any
health risk.
Anyone who has consumed alcohol or drugs or
medicines affecting their ability to react must not
operate a power tool.
Depending on the cutting attachment fitted, use
your power tool only for cutting grass, wild
growth, shrubs, scrub, bushes, small diameter
trees and similar materials.
The machine must not be used for any other pur‐
poses – risk of accidents!
Only use cutting attachments and accessories
that are explicitly approved for this power tool
model by STIHL or are technically identical. If
you have any questions in this respect, consult
your dealer. Use only high quality parts and
accessories. in order to avoid the risk of acci‐
dents and damage to the machine.
STIHL recommends the use of original STIHL
tools and accessories. They are specifically
designed to match the product and meet your
performance requirements.
Never attempt to modify your power tool in any
way since this may increase the risk of personal
injury. STIHL excludes all liability for personal
injury and damage to property caused while
using unauthorized attachments.
Do not use a high-pressure washer to clean the
power tool. The solid jet of water may damage
parts of the unit.
The guard provided with your machine may not
protect the operator from all foreign objects
(gravel, glass, wire etc.) ejected by the revolving
cutting attachment. Ejected objects may also ric‐
ochet and strike the operator.
2.1 Clothing and equipment
Wear proper protective clothing and equipment.
Clothing must be sturdy but allow
complete freedom of movement.
Wear close-fitting clothes such as a
boiler suit, not a loose jacket.
Do not wear clothing which could
become trapped in wood, brush or
moving parts of the machine. Do not
wear a scarf, necktie or jewelry. Tie
up and confine long hair above your
shoulders.
Wear safety boots with steel toe caps
and non-slip soles.
Sturdy shoes with non-slip shoes are permissible
only when using mowing heads.
WARNING
To reduce the risk of eye injuries,
wear close-fitting safety glasses in
accordance with European Standard
EN 166. Make sure the safety
glasses are a snug fit.
Wear face protection and make sure it is a good
fit. Face protection alone is not sufficient to pro‐
tect the eyes.
Wear "personal" sound protection, e.g. ear
defenders.
Wear a safety hard hat for thinning operations,
when working in high scrub and where there is a
danger of head injuries from falling objects.
0458-460-0121-A 3
002BA079 KN
English 2 Safety Precautions and Working Techniques
Wear sturdy protective gloves made
of a resistant material (e. g. leather).
STIHL can supply a comprehensive range of per‐
sonal protective equipment.
2.2 Transporting the machine
Open the fuel cap carefully to allow any pressure
build-up in the tank to release slowly and avoid
fuel spillage.
Only refuel the machine in a well ventilated
place. If fuel has been spilled, immediately clean
the machine – do not allow your clothes to be
splashed with fuel. If that happens, change your
clothes at once.
After refueling, close the fuel cap as
tightly as possible.
This helps reduce the risk of unit vibrations caus‐
ing an incorrectly tightened fuel cap to loosen or
come off and spill quantities of fuel.
Check for leaks. Do not start the engine if there
is a fuel leak – serious or fatal burns could result!
2.4 Before starting
Check that your power tool is properly assem‐
bled and in good condition – refer to appropriate
chapters in the User Manual.
Check the fuel system for leaks, especially the
–
visible parts, e. g., fuel cap, hose connections,
manual fuel pump (only in machines with a
manual fuel pump). In case of leakage and
damage, do not start the engine – risk of fire!
Have the machine serviced by a dealer before
using it
Use only an approved combination of cutting
Always stop the engine.
Carry the machine hanging on the harness or by
the shaft so that it is balanced.
To reduce the risk of cut injuries, fit transport
guard on the cutting attachment, even when car‐
rying the tool for short distances – see also
"Transporting the Unit".
Avoid touching hot parts of the
machine and gearbox – risk of burns!
By vehicle: When transporting in a vehicle, prop‐
erly secure your machine to prevent turnover,
damage and fuel spillage.
2.3 Refueling
Gasoline is an extremely flammable
fuel. Keep clear of naked flames. Do
not spill any fuel – do not smoke.
Always shut off the engine before refueling.
Do not fuel a hot engine – fuel may spill and
cause a fire.
–
attachment, deflector, handle and harness. All
parts must be assembled properly and
securely
The stop switch must be easy to push
–
Check the choke lever, throttle trigger and
–
throttle trigger lockout for smooth action throttle trigger must return automatically to idle
position. The choke lever must spring back
from the g and < positions to the run posi‐
tion F when the throttle trigger lockout and
throttle trigger are squeezed
Check that the spark plug boot is secure – a
–
loose boot may cause sparking that could
ignite combustible fumes and cause a fire!
Cutting attachment or interchangeable attach‐
–
ment: correctly fitted, secure and in perfect
condition
Safety devices (e. g., deflector for cutting
–
attachments, rider plate) for damage and/or
wear. Always replace damaged parts. Do not
use the machine with a damaged deflector or
worn rider plate (if the writing and arrows are
no longer discernible)
4 0458-460-0121-A
002BA055 KN
002BA080 KN
15m (50ft)
2 Safety Precautions and Working Techniques
Never attempt to modify the controls or safety
–
2.6.1 For versions with bike handle
devices
Keep the handles dry and clean – free from oil
–
and dirt – this is important for safe control of
the machine
Adjust the harness and handle(s) to suit your
–
height and reach. Observe the chapter "Fitting
the Harness" – "Balancing the machine"
To reduce the risk of personal injury, do not
operate your power tool if it is damaged or not
properly assembled!
To prepare for emergencies when using a har‐
ness: Practice setting down the machine quickly.
To avoid damage, do not throw the unit to the
ground when practicing.
Right hand on control handle, left hand on grip
on handlebar.
2.6.2 For versions with loop handle
2.5 Starting the engine
Start the engine at least 3 meters from the fuel‐
ing spot, outdoors only.
Place the unit on firm ground in an open area.
Make sure you have good balance and secure
footing. Hold the unit securely. The cutting
attachment must be clear of the ground and all
other obstructions because it may begin to run
when the engine starts.
This is a one-person machine – ensure that there
is no-one within 15 meters of the machine, not
even when starting the power tool! Risk of injury
due to ejected objects!
Avoid contact with the cutting attach‐
ment – risk of injury!
For versions with loop handle and loop handle
with barrier bar, left hand on the loop handle,
right hand on the control handle – even if you are
left-handed.
2.7 While working
Do not drop-start the power tool –
start the engine as described in the
User Manual. The cutting attachment
runs on for a short while after releas‐
ing the throttle trigger – coasting
effect!
Check engine idling: The cutting attachment
must remain at a standstill when the engine idles
– throttle trigger released.
Keep easily combustible materials (e. g., wood
chips, bark, dry grass, fuel) away from hot
exhaust gases and hot muffler surfaces – risk of
fire!
2.6 Holding and guiding the machine
Always hold the unit firmly with both hands on
the handles.
Make sure you always have good balance and
secure footing.
0458-460-0121-A 5
Make sure you always have good balance and
secure footing.
In the event of impending danger or in an emer‐
gency, switch off the engine immediately by
pressing the stop switch.
There is a risk of accident from ejected objects
within a wide area around the working area, so
you must ensure that there is no-one within a
15 m radius of the machine. This distance must
also be maintained in relation to objects (vehi‐
cles, window panes) – risk of property damage!
Even at a distance over 15 m, danger cannot be
ruled out.
Check that the engine is properly idling so that
the cutting tool will not continue rotating after you
release the throttle trigger.
Check and correct the idle speed setting at regu‐
lar intervals. If the cutting attachment still rotates
English
English 2 Safety Precautions and Working Techniques
at idle speed, have your dealer make proper
adjustments or repairs. STIHL recommends you
have this work done by a STIHL servicing dealer.
Take special care in slippery conditions – damp,
snow, ice, on slopes or uneven ground.
Watch out for obstacles: tree stumps, roots – risk
of tripping or stumbling!
Only work while standing on the ground, never
on a ladder or mobile elevated work platform.
Be particularly alert and cautious when wearing
hearing protection because your ability to hear
warnings (shouts, alarms, etc.) is restricted.
Take breaks when you start getting tired or feel‐
ing fatigue – risk of accidents!
Work calmly and carefully – in daylight conditions
and only when visibility is good. Proceed with
caution, do not put others in danger.
As soon as the engine is running, the
power machine generates toxic
exhaust gas.As soon as the engine is
running, the power machine gener‐
ates toxic exhaust gas. These gases
may be odorless and invisible and
may contain unburned hydrocarbons
and benzene. Never run the engine
indoors or in poorly ventilated loca‐
tions, even if your model is equipped
with a catalytic converter.
To reduce the risk of serious or fatal injury from
breathing toxic fumes, ensure proper ventilation
when working in trenches, hollows or other con‐
fined locations.
Stop work immediately if you start suffering from
nausea, headaches, impaired vision (e.g. your
field of vision gets smaller), impaired hearing,
dizziness, or impaired concentration – these
symptoms may possibly be the result of too-high
exhaust gas concentration – Risk of accidents!
Operate your power tool so that it produces a
minimum of noise and emissions – do not run the
engine unnecessarily, accelerate the engine only
when working.
To reduce the risk of fire, do not smoke while
operating or standing near your power tool. Com‐
bustible fuel vapor may escape from the fuel sys‐
tem.
Dust, fumes and smoke produced while working
may be hazardous to health. Wear respiratory
protection in case of heavy dust or smoke emis‐
sion.
If your power tool is subjected to unusually high
loads for which it was not designed (e.g. heavy
impact or a fall), always check that it is in good
condition before continuing work – see also
"Before Starting".
Check in particular that the fuel system has no
leaks and the safety equipment is fully operative.
Never use a power tool that is no longer safe to
operate. In case of doubt, contact a dealer.
Do not operate your power tool in the starting
throttle position – engine speed cannot be con‐
trolled in this position.
To reduce the risk of injury from ejec‐
ted objects, never operate the unit
without the correct deflector for the
type of cutting attachment being
used.
Check the work site – rocks, metal
objects etc. may be caught up and
ejected – possibly over a distance of
15 m – risk of injury! – They can also
damage the cutting attachment and
other property (e. g. parking vehicles,
windows).
Be particularly careful when working on difficult,
densely grown terrain.
When mowing in high shrubbery, under shrub‐
bery and hedges: Hold the cutting tool at a work‐
ing height of at least 15 cm – avoid risks to ani‐
mals.
Always shut off the engine before leaving the
unit unattended.
Examine the cutting attachment periodically at
short intervals and as soon as you note any
noticeable changes:
Stop the engine, hold the machine securely,
–
allow the cutting attachment to come to a stop
Check condition and secure fitting; watch out
–
for cracks
Ensure that the cutting blades are sharp
–
Replace damaged or blunt cutting attachments
–
immediately, even in the event of minor hair‐
line cracks
Clean grass and plant residue off the cutting
attachment mounting at regular intervals –
remove any accumulated material from the cut‐
ting attachment and deflector.
To reduce the risk of injury, shut off the engine
before replacing the cutting attachment.
The gearbox gets hot during opera‐
tion. Never touch the gearbox – risk
of burns!
6 0458-460-0121-A
2 Safety Precautions and Working Techniques English
If a rotating cutting attachment touches a rock or
another hard object, sparks can occur which may
possibly ignite combustible materials. Also driedout plants and brushwood are combustible,
above all in hot and dry weather. If there is a risk
of fire, do not use cutting attachments in the
vicinity of combustible materials, dried-out plants
or brushwood. It is mandatory that you ask the
responsible forestry office about any current fire
hazards.
2.8 Using mowing heads
Extend the cutting attachment deflector with the
attached parts specified in the User Manual.
Only use a deflector with a properly fitted blade,
which limits the mowing line to the permissible
length.
For manually adjustable mowing heads, always
switch off the engine before adjusting the mow‐
ing line – risk of injury!
Misuse with mowing lines that are too long
reduces the working speed of the engine. The
constant slipping of the clutch causes overheat‐
ing and damage to important components (e. g.
clutch, plastic housing parts) – e. g. due to the
cutting attachment rotating during idling – risk of
injury!
2.9 When using metal cutting attachments
STIHL recommends the use of original STIHL
metal cutting attachments. These have been
optimized for the machine and the user’s require‐
ments.
Metal cutting attachments rotate very fast, gener‐
ating forces acting on the attachments and on
the cuttings.
Metal cutting attachments must be sharpened in
regular intervals in accordance with the instruc‐
tions.
Unevenly sharpened metal cutting attachments
generate an imbalance which may cause
extreme loads on the machine – risk of break‐
age!
Dull or improperly sharpened cutting edges can
put a higher load on the cutting attachment and
increase the risk of injuryfrom cracked or broken
parts.
After each contact of the metal cutting attach‐
ment with hard objects (e.g. stones, rocks, metal
parts), check it for damage (e.g. tears and defor‐
mation).
burrs and other visible accumulated material
because they may become detached and be
ejected at high speed during operation.
Do not continue using or attempt to repair dam‐
aged or cracked cutting attachments by means
of welding, straightening or modifying the shape
(unbalanced).
Particles or pieces may come off and hit the
operator or a bystander at a high speed – risk of
most severe injuries!
To reduce the above-named risks involved in
operating a metal cutting attachment, ensure that
the diameter of your metal cutting attachment is
not too big. Also, the attachment must not be too
heavy. It must be made of high-quality materials
and have a suitable geometry (shape, thickness).
A metal cutting attachment not made by STIHL
must not have a different weight, thickness,
shape or a larger diameter than the largest
STIHL metal cutting attachment approved for this
metal cutting attachment – risk of injury!
To reduce the risk of injury, remove
2.10 Vibrations
Prolonged use of the power tool may result in
vibration-induced circulation problems in the
hands (whitefinger disease).
No general recommendation can be given for the
length of usage because it depends on several
factors.
The period of usage is prolonged by:
Hand protection (wearing warm gloves)
–
Work breaks
–
The period of usage is shortened by:
Any personal tendency to suffer from poor cir‐
–
culation (symptoms: frequently cold fingers,
tingling sensations).
Low outside temperatures.
–
The force with which the handles are held (a
–
tight grip restricts circulation).
Continual and regular users should monitor
closely the condition of their hands and fingers. If
any of the above symptoms appear (e.g. tingling
sensation in fingers), seek medical advice.
2.11 Maintenance and Repairs
Service the machine regularly. Do not attempt
any maintenance or repair work not described in
the instruction manual. Have all other work per‐
formed by a servicing dealer.
0458-460-0121-A 7
0000-GXX-0498-A0
English 2 Safety Precautions and Working Techniques
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine. If you have any questions in this
respect, consult a servicing dealer.
STIHL recommends the use of original STIHL
replacement parts. They are specifically
designed to match your model and meet your
performance requirements.
To reduce the risk of injury from unintentional
engine startup, always shut off the engine and
disconnect the spark plug boot before performing
any repairs, maintenance or cleaning work. –
Exception: Carburetor and idle speed adjust‐
ments.
Do not turn the engine over on the starter with
the spark plug boot or spark plug removed since
there is otherwise a risk of fire from uncontained
sparking.
To reduce the risk of fire, do not service or store
your machine near open flames.
Check the fuel filler cap for leaks at regular inter‐
vals.
Use only a spark plug of the type approved by
STIHL and make sure it is in good condition –
see "Specifications".
Inspect the ignition lead (insulation in good con‐
dition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to hearing,
do not operate your machine if the muffler is
damaged or missing. –
Do not touch a hot muffler since burn injury will
result.
Vibration behavior is influenced by the condition
of the AV elements – check the AV elements at
regular intervals.
2.12 Symbols on Deflectors
An arrow on the deflector shows the correct
direction of rotation of the cutting attachments.
Some of the following symbols are applied to the
outside of the deflector to indicate the approved
combination of cutting attachment and deflector.
2.13 Shoulder Strap/Harness
The shoulder strap/harness is included with the
machine or available as a special accessory.
► Use the shoulder strap/harness.
► With the engine running, attach the machine to
Grass cutting blades and brush knives must
always be used in combination with a shoulder
strap.
Circular saw blades must always be used in
combination with a full harness with a quickrelease system.
Deflector may be used with mowing
heads.
Deflector must not be used with mow‐
ing heads.
Deflector may be used with grass cut‐
ting blades.
Deflector must not be used with grass
cutting blades.
Deflector may be used with brush kni‐
ves.
Deflector must not be used with brush
knives.
Deflector must not be used with
shredder blades.
Deflector must not be used with circu‐
lar saw blades.
the shoulder strap/harness.
8 0458-460-0121-A
000BA015 KN
002BA049 KN
002BA135 KN
2 Safety Precautions and Working Techniques English
2.14 Mowing Head with Nylon Line
If one of the wear limit marks on the PolyCut
mowing head is worn through (arrow): Do not
continue using the mowing head. Install a new
one. There is otherwise a risk of injury from
thrown parts of the head.
It is important to follow the maintenance instruc‐
tions for the PolyCut mowing head.
The PolyCut can also be equipped with mowing
line in place of the polymer blades.
The mowing head comes with instruction leaflets.
Equip the mowing head with polymers blades or
nylon line as described in the instruction leaflets.
Nylon line achieves a soft cut for edging and
trimming around trees, fence posts, etc. – less
risk of damaging tree bark.
The mowing head comes with an instruction leaf‐
let. Refill the mowing head with nylon line as
described in the instruction leaflet.
WARNING
To reduce the risk of serious injury, never use
wire or metal-reinforced line in place of the nylon
line.
2.15 STIHL Polycut Mowing Head with Polymer Blades
For mowing unobstructed edges of meadows
(without posts, fences, trees or similar obsta‐
cles).
Check the wear limit marks!
WARNING
Never use wire in place of the nylon mowing line
– risk of injury.
2.16 Risk of Kickout (Blade Thrust) with Metal Cutting Attachments
WARNING
When using metal cutting attach‐
ments there is a risk of kickout when
the rotating blade comes into contact
with a solid object such as a tree
trunk, branch, tree stump, rock or
similar. The machine is thrown to the
right or to the rear – opposite to the
attachment's direction of rotation.
0458-460-0121-A 9
000BA020 KN
002BA355 KN
002BA509 KN
English 2 Safety Precautions and Working Techniques
The risk of kickout is greatest when the black
area of the rotating cutting attachment comes
into contact with a solid object.
2.17 Grass Cutting Blade
Use the brushcutter like a scythe (sweep it to the
right and left) at ground level when cutting grass
and thinning young stands.
To cut wild growth and scrub, lower the brush
knife down onto the growth to achieve a shred‐
Use for grass and weeds only – sweep the
brushcutter in an arc like a scythe.
WARNING
Improper use may damage the grass cutting
blade – risk of injury from thrown parts.
Resharpen the grass cutting blade according to
instructions when it has dulled noticeably.
2.18 Brush Knife
For cutting matted grass, wild growth and scrub
and thinning young stands with a stem diameter
of no more than 2 cm – do not cut thicker stems
– risk of accidents.
ding effect – always keep the cutting attachment
below hip level during this process.
Exercise extreme caution when using this
method of cutting. The higher the cutting attach‐
ment is off the ground, the greater the risk of
injury from cuttings being thrown sideways.
Warning! Improper use of a brush knife may
cause it to crack, chip or shatter – risk of injury
from thrown parts.
To reduce the risk of injury it is essential to take
the following precautions:
Avoid contact with stones, rocks, pieces of
–
metal and other solid foreign objects.
Never cut wood or shrubs with a stem diame‐
–
ter of more than 2 cm – use a circular saw
blade for such work.
Inspect the brush knife at regular short inter‐
–
vals for signs of damage. Do not continue
working with a damaged brush knife.
Resharpen the brush knife regularly and
–
whenever it has dulled noticeably, and have it
balanced if necessary (STIHL recommends a
STIHL servicing dealer).
10 0458-460-0121-A
002BA068 KN
2 Safety Precautions and Working Techniques English
2.19 Circular Saw Blade
For cutting shrubs and trees:
Up to a stem diameter of 4 cm when used on
brushcutters.
Up to a stem diameter of 7 cm when used on
clearing saws.
Before starting the cut, accelerate the engine up
to full throttle. Perform cut with uniform pressure.
Use circular saw blades only with a matching
limit stop of the correct diameter.
WARNING
To reduce the risk of blade damage, avoid con‐
tact with stones and the ground. Resharpen the
blade properly in good time – dull teeth may
result in the blade cracking and shattering and
causing serious injury.
When felling, maintain a distance of at least two
tree lengths from the next felling site.
2.19.1 Risk of kickout
The risk of kickout is highest in the black area of
the blade: Do not use this area of the circular
saw blade for cutting.
There is also a risk of kickout when using the
lighter shaded areas of the blade: These areas
of the blade should only be used by experienced
operators with specialized training.
STIHL recommends that you use the non-sha‐
ded area of the circular saw blade. Always start
the cut with this area of the blade.
0458-460-0121-A 11
14
13
11
10
18
17
16
15
19
1
2
3
4
8
9
5
23
23
21
22
23
21
20
22
24
26
26
25
25
26
27
12
6
7
0000079996_005
English 3 Approved Combinations of Cutting Attachment, Deflector, Handle an…
3 Approved Combinations of Cutting Attachment, Deflector, Han‐
dle and Harness
Cutting attachment Deflector, limit stop Handle Carrying strap
WARNING
4 STIHL DuroCut 20‑2
5 STIHL PolyCut 20‑3
6 STIHL PolyCut 28‑2
7 STIHL TrimCut 32‑2
3.2.2 Metal cutting tools
8 Grass cutting blade 230‑2
(230 mm dia.)
9 Grass cutting blade 260‑2
(260 mm dia.)
10 Grass cutting blade 230‑4
(230 mm dia.)
11 Grass cutting blade 230‑8
(230 mm dia.)
12 Grass cutting blade 250‑32
(250 mm dia.)
13 Brush knife 250‑3
3.1 Permissible combinations
Choose the correct combination from the table
depending on the cutting tool!
For safety reasons only the cutting attachments,
deflector, handle and harness versions within
one line of the table may be combined with one
another. No other combinations are permitted
because of the risk of accidents!
3.2 Cutting attachments
3.2.1 Mowing heads
1 STIHL SuperCut 20‑2
2 STIHL AutoCut C 26‑2
3 STIHL AutoCut 25‑2 / AutoCut 27-2
12 0458-460-0121-A
0000-GXX-1283-A0
1
3
4
6
7
A
7
1
A
002BA237 KN
5
4 Mounting the Bike Handle English
(250 mm dia.)
14 Circular saw blade 200-22 chisel tooth
(4112), circular saw blade 200-22 HP chisel
tooth (4001)
WARNING
Grass cutting blades, brush knives and circular
saw blades of other, non-metal materials must
not be used.
3.3 Deflectors, limit stop
15 Deflector for mowing heads
16 Deflector with
17 Skirt and blade for mowing heads
18 Deflector without skirt and blade for metal cut‐
ting attachments, items 7 to 12
19 Limit stop for circular saw blades
3.4 Handles
20 Loop handle
21 Loop handle with
22 Barrier bar
23 Bike handle
3.5 Shoulder straps
24 Shoulder strap can be used
25 Shoulder strap must be used
26 Full harness can be used
27 Full harness must be used
4 Mounting the Bike Handle
4.1 Mounting the Handlebar
► Fasten the handlebar (1) at a distance (A) of
approx. 40 cm (15 in) ahead of the engine
housing on the shaft (2)
► Position the clamp (3) and handlebar sup‐
port (4) on the shaft (2)
4.2 Fastening the Handlebar
► Place the handlebar (1) in the handle support
0458-460-0121-A 13
so that distance A is no more than 15 cm/6 in
– the rubber handle (5) must be on the left
(viewed from engine)
► Place the clamp (6) on the handlebar support
► Insert the screws (7) through the holes in the
parts and screw them into the clamp (3) as far
as they will go
► Align the handlebar
► Tighten the screws
12
8
10
11
1
12
0000-GXX-1284-A0
9
14
14
13
14
13
0000-GXX-1285-A1
English 4 Mounting the Bike Handle
4.3 Mounting the Control Handle
► Take out the screw (8) – the nut (9) remains in
the control handle (10)
► Push the control handle with the throttle trig‐
ger (11) facing toward the gearbox onto the
end of the handlebar (1) until the holes (12)
align
► Insert and tighten screw (8)
4.4 Fastening the Throttle Cable
NOTICE
Do not kink the throttle cable or lay it in tight radii
– make sure the throttle trigger moves freely.
► Position the throttle cable retainer (14) and the
throttle cable (13) on the shaft
► Squeeze the throttle cable retainer (14). The
throttle cable retainer (14) engages in position
with an audible click
4.5 Adjusting the Throttle Cable
Some machine versions are equipped with a
throttle cable adjuster.
► Check adjustment of throttle cable – see chap‐
ter on "Adjusting the Throttle Cable"
14 0458-460-0121-A
2
002BA098 KN
1
1
5
4
002BA099 KN
2
3
6
7
7
8
5
4
1
6
1
3
8
7
002BA614 KN
5 Mounting the Loop Handle English
5 Mounting the Loop Handle
5.1 Mounting Loop Handle with Barrier Bar
► Fit the square nuts (1) in the barrier bar (2);
the holes must line up.
► Position the clamp (6) against the drive tube.
► Place the barrier bar (2) in position as shown.
► Line up the holes.
► Insert the screws (7) in the holes and screw
them into the barrier bar (2) as far as stop.
► Go to "Securing the Loop Handle".
5.2 Mounting the Loop Handle without Barrier Bar
► Place the clamp (3) in the loop handle (4) and
position them both against the drive tube (5).
► Position the clamp (6) against the drive tube.
► Line up the holes.
► Fit washers (8) on the screws (7) and insert
the screws in the holes. Fit the square nuts (1)
and screw them down as far as stop.
► Go to "Securing the Loop Handle".
► Place the clamp (3) in the loop handle (4) and
position them both against the drive tube (5).
0458-460-0121-A 15
9
4
A
002BA615 KN
002BA655 KN
1
002BA529 KN
English 6 Adjusting the Throttle Cable
5.3 Securing the Loop Handle
► Set the throttle trigger to the full throttle posi‐
tion.
► Carefully rotate the screw in the throttle trigger
in the direction of the arrow until you feel initial
resistance. Then rotate it another half turn in
the same direction.
7 Fitting the Carrying Ring
7.1 Polymer Version
The loop handle can be adjusted to suit the
height and reach of the operator and the applica‐
tion by changing distance (A).
Recommendation: distance (A): about 20 cm
(8 in)
► Slide the handle to the required position.
► Line up the loop handle (4).
► Tighten down the screws until the loop handle
can no longer be rotated on the drive tube. If
no barrier bar is fitted – lock the nuts if neces‐
sary.
The sleeve (9) (not fitted on all models) must be
between the loop handle and the control handle.
6 Adjusting the Throttle
Cable
It may be necessary to correct the adjustment of
the throttle cable after assembling the machine
or after a prolonged period of operation.
Adjust the throttle cable only when the unit is
completely and properly assembled.
For position of carrying ring see "Main Parts".
► Push the carrying ring (1) over the drive tube.
► Insert the M5 nut in the hex recess in the car‐
rying ring.
► Fit the M5x14 screw.
► Line up the carrying ring.
► Tighten down the screw firmly.
16 0458-460-0121-A
002BA636 KN
2
1
3
3
002BA637 KN
1.
2.
002BA646 KN
002BA638 KN
8 Mounting the deflector English
8 Mounting the deflector
8.1 Mounting the Deflector
8.2 Fitting the Skirt and Blade
WARNING
Risk of injury from thrown objects and contact
with the cutting attachment. These parts must be
fitted to the deflector (1) when you use a mowing
head.
8.3 Fitting the Skirt
► Slide the lower guide slot of the skirt onto the
deflector – it must snap into position.
8.4 Removing the Skirt
1 Deflector for mowing attachments
2 Deflector for mowing heads
Deflectors (1 and 2) are both mounted to the
gearbox in the same way.
► Place the deflector on the gearbox flange.
► Insert the screws (3) and tighten them down
firmly.
► Insert the stop pin into the hole in the skirt and
use it to push the skirt to the left.
► Pull the skirt off the deflector.
8.5 Mounting the Blade
0458-460-0121-A 17
► Slide the line limiting blade into the guide on
the skirt.
► Insert the screw and tighten it down firmly.
7
002BA639 KN
6
002BA104 KN
1
0000-GXX0500-A0
3
2
2
002BA266 KN
English 9 Mounting the Cutting Attachment
8.6 Mounting the Limit Stop
WARNING
Risk of injury from thrown objects and contact
with the cutting attachment. Always fit the limit
stop (6) when you use a circular saw blade.
► Position the limit stop (6) on the gearbox
flange.
► Insert the screws (7) and tighten them down
firmly.
9 Mounting the Cutting
Attachment
9.1 Placing power tool on the ground
► Shut off the engine.
► Lay your power tool on its back so that the cut‐
ting attachment mounting face is pointing up.
9.2 Mounting Hardware for Cutting Attachments
The mounting hardware supplied depends on the
cutting attachment that comes as original equip‐
ment with the new machine.
9.2.1 Machine supplied with mounting hard‐
Mowing heads and metal cutting attachments
may be mounted.
ware
Depending on the cutting attachment, it may be
necessary to use the nut (3) and rider plate (2).
The thrust plate (1) must be used with all cutting
attachments.
These parts are included in a kit supplied with
the machine and are also available as special
accessories.
9.2.2 Machine supplied without mounting
hardware
Only mowing heads may be used which mount
directly to the shaft (2).
18 0458-460-0121-A
6
7
2
002BA330 KN
6
0000-GXX-1323-A0
4
1
2
3
5
6
1
0000-GXX-1324-A0
2
3
4
9 Mounting the Cutting Attachment English
9.3 Blocking the Shaft
► Take the rider plate (4) off the shaft (5). Do not
remove the thrust plate (6).
9.5 Mounting the Cutting Attach‐
ment
WARNING
Risk of injury from thrown objects and contact
with the cutting attachment. Use a deflector that
matches the cutting attachment – see "Mounting
the Deflector".
The output shaft (2) must be blocked with the
stop pin (6) or screwdriver (6) to mount or
remove cutting attachments. These parts come
standard with the machine or are available as
special accessories.
► Insert the stop pin (6) or screwdriver (6) in the
hole (7) in the gearbox as far as stop – and
apply slight pressure.
► Rotate shaft, nut or cutting attachment until
the stop pin slips into position and blocks the
shaft.
9.6 Fitting Mowing Head with
Screw Mounting
Keep the instruction leaflet for the mowing head
in a safe place.
9.4 Removing the Mounting Hard‐
ware
► Fit the thrust plate (1).
► Screw the mowing head (3) counterclockwise
► Block the shaft (5) with the stop pin (1).
► Use the combination wrench (2) to loosen and
remove the nut (3) clockwise (left-hand
thread).
0458-460-0121-A 19
on to the shaft (4) as far as stop.
► Block the shaft (4) with the stop pin (2).
► Tighten down the mowing head (3) firmly.
NOTICE
Remove the tool used to block the shaft.
9.7 Remove the mowing head.
► Block the shaft (4) with the stop pin (2).
► Unscrew and remove the mowing head (3)
clockwise.
1
681BA303 KN
2
3
4
5
6
7
8
8
9
10
11
13
14
0000-GXX-0502-A0
12
English 9 Mounting the Cutting Attachment
9.8 Mounting Metal Cutting Attach‐
ments
Keep the leaflet and packaging of the metal cut‐
ting attachment in a safe place.
WARNING
Wear protective gloves to reduce the risk of
direct contact with the sharp cutting edges.
Mount only one metal cutting attachment.
Check direction of rotation of cutting attachment
► Fit the thrust plate (9).
► Place the cutting attachment (8) on the thrust
plate (9).
Collar (see arrow) must engage the cutting
attachment's mounting hole.
Securing the cutting attachment
► Fit the rider plate (10).
► Block the shaft (11) with the stop pin (12).
► Use the combination wrench (14) to screw the
mounting nut (13) on to the output shaft coun‐
terclockwise and tighten it down firmly.
Cutting attachments 2, 4, 5 and 6 may be moun‐
ted either way round – they must be turned over
regularly to help avoid one-sided wear.
The cutting edges of cutting attachments 1, 3, 7
and 8 must point clockwise.
Direction of rotation is indicated by an arrow on
the inside of the deflector.
WARNING
There is a risk of injury if the cutting attachment
works loose. If the mounting nut has become too
loose, fit a new one.
NOTICE
Remove the tool used to block the shaft.
9.9 Removing the Metal Cutting Attachment
20 0458-460-0121-A
WARNING
Wear protective gloves to reduce the risk of
direct contact with the sharp cutting edges.
► Block the shaft (11) with the stop pin (12).
► Unscrew the mounting nut (13) clockwise.
10 Fuel English
► Remove cutting attachment and its mounting
hardware from the gearbox – but do not
remove the thrust plate (9).
10 Fuel
The engine requires a mixture of gasoline and
engine oil.
WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
10.1 STIHL MotoMix
STIHL recommends using STIHL MotoMix. This
pre-blended fuel is free of benzene and lead, is
distinguished by a high octane rating, and
always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for optimum engine life.
MotoMix is not available in all markets.
10.2 Mixing fuel
NOTICE
Unsuitable fuels or a mixing ratio that deviates
from the specification can lead to severe engine
damage. The engine, seals, fuel lines and fuel
tank may be damaged if low-quality gasoline or
engine oil is used.
10.2.1 Gasoline
Use only high-quality gasoline with an octane rat‐
ing of at least 90 ROC – leaded or unleaded.
Gasoline with an alcohol component exceeding
10% can cause impaired engine performance in
engines with manually adjustable carburetors
and thus should not be used in these engines.
Engines with M-Tronic deliver full engine per‐
formance using gasoline with an alcohol compo‐
nent of up to 27% (E27).
10.2.2 Engine oil
If you mix the fuel yourself, use only STIHL twostroke engine oil or another high-performance
engine oil classified as JASO FB, JASO FC,
JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-LEGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
over the machine’s service life.
0458-460-0121-A 21
10.2.3 Mixing ratio
with STIHL two-stroke engine oil 1:50; 1:50 =
1 part oil + 50 parts gasoline
10.2.4 Examples
Quantity of gaso‐
line
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
► Pour oil into an approved safety fuel canister
first, then add gasoline and mix thoroughly
STIHL two-stroke
engine oil 1:50
10.3 Storing fuel mixture
Store in approved safety fuel canisters only in a
dry, cool and secure place protected against light
and sunlight.
Fuel mixture deteriorates with age – mix only as
much as needed for a few weeks. Do not store
fuel mixture for longer than 30 days. The fuel
mixture can become unusable more quickly if
exposed to light, sunlight or low or high tempera‐
tures.
STIHL MotoMix however can be stored for up to
5 years without any problems.
► Shake the canister containing the fuel mixture
thoroughly before refueling
WARNING
Pressure may have built up in the canister –
open it carefully.
► The fuel tank and the canister in which fuel
mixture is stored should be cleaned thoroughly
from time to time
Residual fuel and the liquid used for cleaning
must be disposed of in accordance with regula‐
tions and without harming the environment!
11 Fueling
0000-GXX-0476-A0
002BA447 KN
002BA448 KN
1
0000-GXX-0503-A0
2
English 12 Fitting the Harness
11.1 Preparations
► Turn the cap clockwise as far as stop and
tighten it down as firmly as possible by hand.
12 Fitting the Harness
The type and style of the harness/shoulder strap
depend on the market.
The use of the shoulder strap is described in the
chapter on "Approved Combinations of Cutting
Attachment, Deflector, Handle and Harness".
12.1 Shoulder Strap
► Before fueling, clean the filler cap and the area
around it to ensure that no dirt falls into the
tank.
► Position the machine so that the tank cap
faces up.
11.2 Opening the Tank Cap
► Turn the cap counterclockwise until it can be
removed from the tank opening.
► Remove the tank cap.
11.3 Filling Up with Fuel
Take care not to spill fuel while fueling and do
not overfill the tank.
STIHL recommends you use the STIHL filler noz‐
zle for fuel (special accessory).
► Fill up with fuel.
► Put on the shoulder strap (1).
► Adjust the length of the strap so that the cara‐
biner (2) is about a hand’s width below your
right hip.
► Balance the machine – see "Balancing the
Machine".
11.4 Closing the Tank Cap
► Place the cap in the opening.
22 0458-460-0121-A
3
0000-GXX-0504-A0
2
1
1
002BA660 KN
2
1
1
2
2
13 Balancing the Machine English
12.2 Full Harness
13 Balancing the Machine
13.1 Attaching Machine to Harness
► Put on the harness (1) and close the locking
plate (3).
► Adjust the length of the strap – with the
machine attached, the carabiner (2) must be
about a hand's width below your right hip.
► Balance the machine – see "Balancing the
Machine".
The type and style of the shoulder strap and car‐
abiner depend on the market.
► Attach the carabiner (1) to the carrying ring (2)
on the drive tube.
13.2 Balancing the Machine
The unit is balanced differently depending on the
cutting attachment used.
Proceed as follows until the conditions specified
under "Floating positions" have been met:
0458-460-0121-A 23
002BA662 KN
1
2
A
002BA034 KN
B
002BA035 KN
002BA661 KN
2
1
1
1
2
2
English 13 Balancing the Machine
Circular saw blades (B)
► should "hover" about 20 cm (8 in) above the
ground.
When the correct balanced position has been
reached:
► Tighten down the screw (1) on the carrying
ring firmly.
13.3 Disconnecting Machine from Harness
► Loosen the screw (1).
► Slide the carrying ring (2) along the drive tube.
► Tighten the screw (1) moderately.
► Allow the unit to hang freely.
► Check the position obtained:
Balanced positions
Mowing tools (A) such as mowing heads, grass
cutting blades and brush knives
► should just touch the ground.
► Press down the bar on the carabiner (1) and
pull the carrying ring (2) out of the carabiner.
24 0458-460-0121-A
3
1
2
0000-GXX-0494-A0
2
1
3
0000-GXX-0477-A0
0000-GXX-0478-A0
14 Starting / Stopping the Engine English
14 Starting / Stopping the
Engine
14.1 Controls
14.1.1 Version with Bike Handle
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop positions.
Depress the stop switch (…) to switch off the
ignition – see "Function of stop switch and
ignition system".
14.1.2 Version with Loop Handle
ignition – see "Function of stop switch and
ignition system".
14.1.3 Function of stop switch and ignition
The ignition is switched off and the engine stop‐
ped when the stop switch is pressed. The stop
switch returns automatically to the Run position
when it is released: The ignition is switched on
again after the engine stops – the engine is then
ready to start.
system
14.2 Starting the Engine
► Press the manual fuel pump bulb (9) at least
five times – even if the bulb is already filled
with fuel.
► Press in the choke knob (8) and turn it to the
position that suits the engine temperature:
if the engine is cold
g
for warm start – also use this position if the
<
engine has been running but is still cold.
The choke knob must engage in position.
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop positions.
Depress the stop switch (…) to switch off the
0458-460-0121-A 25
0000-GXX-0479-A0
0000-GXX-0480-A0
0000-GXX-0481-A0
002BA664 KN
English 14 Starting / Stopping the Engine
14.2.1 Cranking
► Pull the starter grip slowly until you feel it
engage and then give it a brisk strong pull.
NOTICE
Do not pull out the starter rope all the way – it
might otherwise break.
► Do not let the starter grip snap back. Guide it
slowly back into the housing so that the starter
rope can rewind properly.
► Continue cranking until the engine runs.
14.2.2 As soon as the engine runs
► Place the unit on the ground: It must rest
securely on the engine support and the deflec‐
tor.
► If fitted: Remove the transport guard from the
cutting attachment.
To reduce the risk of accidents, check that the
cutting attachment is not touching the ground of
any other obstacles.
► Make sure you have a firm footing, either
standing, stooping or kneeling.
► Hold the unit firmly on the ground with your left
hand and press down – do not touch the throt‐
tle trigger or lockout lever – your thumb should
be under the fan housing.
NOTICE
Do not stand or kneel on the drive tube.
► Press down the throttle trigger lockout and
open the throttle – the choke knob moves to
the run position F. After a cold start, warm up
the engine by opening the throttle several
times.
WARNING
There is a risk of injury if the cutting attachment
runs when the engine is idling. Adjust the carbu‐
retor so that the cutting attachment does not run
when the engine is idling – see “Adjusting the
Carburetor”.
Your machine is now ready for operation.
14.3 Stopping the Engine
► Hold the starter grip with your right hand.
26 0458-460-0121-A
► Depress the momentary contact stop switch –
the engine stops – release the stop switch – it
springs back to the run position.
681BA268 KN
681BA269 KN
681BA270 KN
681BA272 KN
681BA268 KN
15 Transporting the Unit English
14.4 Other Hints on Starting
Engine stalls in cold start position g or under
acceleration.
►
Move the choke knob to < and continue
cranking until the engine runs.
Engine does not start in warm start position <
►
Move the choke knob to g and continue
cranking until the engine runs.
If the engine does not start
► Check that all settings are correct.
► Check that there is fuel in the tank and refuel if
necessary.
► Check that the spark plug boot is properly con‐
nected.
► Repeat the starting procedure.
Engine is flooded
►
Move the choke knob to F and continue crank‐
ing until the engine runs.
Fuel tank run until completely dry
► After refueling, press the manual fuel pump
bulb at least five times – even if the bulb is
already filled with fuel.
► Set the choke lever to suit the engine temper‐
ature.
► Now start the engine.
15 Transporting the Unit
15.1 Using Transport Guard
The type of transport guard depends on the
metal cutting attachment supplied with the
machine. Transport guards are available as spe‐
cial accessories.
15.2 230 mm Grass Cutting Blades
0458-460-0121-A 27
15.3 250 mm Brush Knives
681BA269 KN
681BA271 KN
681BA272 KN
681BA301 KN
681BA275 KN
1.
2.
681BA305 KN
2.
681BA311 KN
English 15 Transporting the Unit
► Disconnect wire rod from the transport guard.
► Swing wire rod outwards.
15.4 Grass Cutting Blades up to 260 mm
28 0458-460-0121-A
► Fit the transport guard on the cutting attach‐
ment from below.
► Swing wire rod into position.
► Hook wire rod to the transport guard.
681BA302 KN
681BA275 KN
1.
2.
681BA276 KN
681BA277 KN
2.
16 Operating Instructions English
15.5 Circular Saw Blades
► Swing wire rod into position.
► Hook wire rod to the transport guard.
16 Operating Instructions
16.1 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 unnecessary high loads dur‐
ing 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
► Disconnect wire rod from the transport guard.
period. The engine develops its maximum power
after about 5 to 15 tank fillings.
16.2 During Operation
After a long period of full throttle operation, allow
the engine to run for a short while at idle speed
so that engine heat can be dissipated by the flow
of cooling air. This protects engine-mounted
components (ignition, carburetor) from thermal
overload.
16.3 After Finishing Work
Storing for a short period: Wait for the engine to
cool down. Empty the fuel tank and keep the
machine in a dry place, well away from sources
of ignition, until you need it again. For longer outof-service periods – see "Storing the Machine".
17 Replacing the Air Filter
Filters have an average life of more than a year.
Do not remove the filter cover or replace the air
filter as long as there is no noticeable loss of
power.
► Swing wire rod outwards.
► Fit transport guard on saw blade from below,
making sure the limit stop is properly seated in
the recess.
0458-460-0121-A 29
1
1
0000-GXX-0482-A0
2
3
4
0000-GXX-0495-A0
3
2
1
0000-GXX 0537-A0
000BA039 KN
A
English 18 Adjusting the Carburetor
17.1 If there is a noticeable loss of engine power
running and then turn the screw about another
1/2 to 3/4 turn in the same direction.
WARNING
If the cutting attachment continues to run when
the engine is idling, have your machine checked
and repaired by your servicing dealer.
19 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
►
Turn the choke knob to g.
► Loosen the screws (1).
► Remove the filter cover (2).
► Clean away loose dirt from around the filter.
► Remove the filter element (3).
► Replace dirty or damaged filter element (3).
► Replace any damaged parts.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
19.1 Removing the Spark Plug
17.2 Installing the Filter Element
► Install the filter element (3) in the filter housing
and fit the cover.
► Insert the screws (1) and tighten them down
firmly.
18 Adjusting the Carburetor
The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
18.1 Adjusting Idle Speed
► Remove the cover (1).
► Pull off the spark plug boot (2).
► Unscrew the spark plug (3).
19.2 Checking the Spark Plug
Engine stops while idling
► Warm up the engine for about 3 minutes.
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting attachment must not run.
Cutting attachment runs when engine is idling
► Turn the idle speed screw (LA) slowly counter‐
clockwise until the cutting attachment stops
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
Too much oil in fuel mix.
–
Dirty air filter.
–
30 0458-460-0121-A
1
000BA045 KN
1
0000-GXX-0536-A0
20 Engine Running Behavior English
Unfavorable running conditions.
–
Check grease level after every 25 hours of oper‐
ation and re-lubricate if necessary.
► Remove the screw plug (1).
► If no grease can be seen on the inside of the
screw plug (1): Screw the tube (2) of STIHL
gear lubricant (special accessory) into the filler
hole.
► Squeeze no more than 5 g (1/5 oz) grease into
the gearbox.
NOTICE
WARNING
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
19.3 Installing the Spark Plug
► Screw the spark plug (3) into the cylinder.
► Tighten down the spark plug (3) with the com‐
bination wrench.
► Press the boot (2) firmly onto the spark plug.
► Fit the cover (1) and screw it down firmly.
20 Engine Running Behavior
If engine running behavior is unsatisfactory even
though the air filter is clean and the carburetor is
properly adjusted, the cause may be the muffler.
Have the muffler checked for contamination (car‐
bonization) by your servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer.
21 Lubricating the Gearbox
Do not completely fill the gearbox with grease.
► Unscrew the tube (2).
► Insert the screw plug (1) and tighten it down
firmly.
22 Storing the Machine
If out of use for periods of about 30 days or lon‐
ger
► Drain and clean the fuel tank in a well-ventila‐
ted area.
► Dispose of fuel properly in accordance with
local environmental requirements.
► If a manual fuel pump is fitted: Press the man‐
ual fuel pump at least 5 times.
► Start the engine and run it at idling speed until
it stops
► Remove, clean and inspect the cutting attach‐
ment. Treat metal cutting attachments with
protective oil.
► Thoroughly clean the machine
► Cleaning the Air Filter
► Store the machine in a dry and safe place, out
of the reach of children and other unauthor‐
ized users
23 Sharpening Metal Cutting
Blades
► Use a sharpening file (special accessory) to
sharpen dull cutting attachments. In case of
more serious wear or nicks: Resharpen with a
grinder or have the work done by a dealer –
STIHL recommends a STIHL servicing dealer.
► Sharpen frequently, take away as little metal
as possible – two or three strokes of the file
are usually enough.
0458-460-0121-A 31
002BA665 KN
1
2
2
1
2
2
1
2
1
1
002BA104 KN
English 24 Maintaining the Mowing Head
► Shut off the engine.
► Lay your power tool on its back so that the cut‐
ting attachment mounting face is pointing up.
24.2 Replacing Nylon Line
Always check the mowing head for signs of wear
before replacing the nylon line.
WARNING
If there are signs of serious wear, replace the
complete mowing head.
The nylon mowing line is referred to as "nylon
line" or "line" in the following.
The mowing head is supplied with illustrated
instructions for replacing the nylon line. Keep the
instructions for the mowing head in a safe place.
► If necessary, remove the mowing head.
24.3 Adjusting Nylon Line
STIHL SuperCut
► Resharpen the teeth (1) uniformly – do not
alter the contour of the parent blade (2) in any
way.
See cutting attachment packaging for additional
sharpening instructions. Keep the packaging for
future reference.
23.1 Balancing
► After resharpening about 5 times, check the
cutting attachment for out-of-balance on a
STIHL balancer (special accessory) or have it
checked by a dealer and re-balanced as nec‐
essary – STIHL recommends a STIHL servic‐
ing dealer.
24 Maintaining the Mowing
Head
24.1 Placing power tool on the ground
Fresh line is advanced automatically if the
remaining line is at least 6 cm (2 1/2 in) long.
The blade on the deflector trims overlong lines to
the correct length.
STIHL AutoCut
► With the engine running, hold the rotating
mowing head above the grass surface.
► Tap it on the ground once – fresh line is
advanced and the blade on the deflector trims
it to the right length.
Fresh line is advanced every time the mowing
head is tapped on the ground. For this reason
observe the mowing head's cutting performance
during operation. If the mowing head is tapped
on the ground too often, the line limiting blade
will unnecessarily cut off unused lengths of nylon
line.
Line feed operates only if both lines are still at
least 2.5 cm (1 in) long.
STIHL TrimCut
WARNING
To reduce the risk of injury, always shut off the
32 0458-460-0121-A
engine before adjusting the nylon line by hand.
► Pull the spool up – rotate it about 1/6 turn
counterclockwise until it engages – and allow it
to spring back.
► Pull ends of the lines outward.
25 Maintenance and Care English
Repeat the above procedure as necessary until
both lines reach the limiter blade on the deflec‐
tor.
Rotating the spool from one stop to the next
advances about 4 cm (1 1/2 in) of fresh line.
24.4 Replacing Nylon Line
STIHL PolyCut
Precut lengths of nylon line can be fitted to the
PolyCut in place of the cutting blades.
STIHL DuroCut, STIHL PolyCut
WARNING
To reduce the risk of injury, always shut off the
engine before refilling the mowing head.
► Fit precut lengths of nylon line in the mowing
head as described in the instructions supplied.
24.5 Replacing Cutting Blades
24.5.1 STIHL PolyCut
Always check the mowing head for signs of wear
before installing new cutting blades.
25 Maintenance and Care
The following intervals apply to normal operating
conditions only. If your daily working time is longer
or operating conditions are difficult (very dusty work
area, etc.), shorten the specified intervals accord‐
ingly.
WARNING
If there are signs of serious wear, replace the
complete mowing head.
The thermoplastic cutting blades are referred to
as "blades" in the following.
The mowing head is supplied with illustrated
instructions for replacing the blades. Keep the
instructions for the mowing head in a safe place.
WARNING
To reduce the risk of injury, always shut off the
engine before installing the blades.
► Remove the mowing head.
► Replace blades as shown in the illustrated
instructions.
► Mount the mowing head on the machine.
weekly
monthly
if problem
if damaged
as required
every 12 months
before starting work
after each refueling stop
Complete machine Visual inspection (condi‐
Control handle Check operation X X
Air filter Visual inspection X X
Manual fuel pump (if fit‐
ted)
Pickup body (filter) in fuel
tank
0458-460-0121-A 33
tion, leaks)
Clean X
Replace any damaged
parts
2)
Replace
Check X
Have repaired by servic‐
ing dealer
Have checked by servic‐
ing dealer
Have replaced by serv‐
icing dealer
1)
1)
1)
after finishing work or daily
X X
X X
X
X
X
X X X
English 25 Maintenance and Care
The following intervals apply to normal operating
conditions only. If your daily working time is longer
or operating conditions are difficult (very dusty work
area, etc.), shorten the specified intervals accord‐
ingly.
weekly
monthly
if problem
if damaged
as required
every 12 months
before starting work
after each refueling stop
after finishing work or daily
Fuel tank Clean X X
Carburetor Check idle adjustment –
X X
the cutting attachment
must not rotate
Adjust idle speed X
Spark plug Adjust electrode gap X
Replace after every 100
operating hours
Cooling inlets Visual inspection X
Clean X
Cylinder fins Have cleaned by servic‐
ing dealer
1)
Valve clearance If power is low or crank‐
X
X X
ing effort very high, have
valve clearance checked
and, if necessary, adjus‐
ted by servicing dealer
Combustion chamber Have cleaned after
1)
X
every 150 hours of oper‐
ation by servicing
1)
dealer
All accessible screws and
Retighten X
nuts (not adjusting
screws)
Antivibration elements Check X X X
Have replaced by serv‐
icing dealer
1)
X
Cutting attachments Visual inspection X X
Replace X
Check tightness X X
Metal cutting attachments Sharpen X X
Gearbox lubrication Check X
Replenish X
Safety labels Replace X
1)
STIHL recommends an authorized STIHL servicing dealer.
2)
Only if there is a noticeable loss of engine power
34 0458-460-0121-A
19
18
8
9
14
3
2
10
10
8
9
11
12
13
0000-GXX-0508-A0
14
1
4
5
6
#
7
15
16
17
13 1313
20
20
26 Minimize Wear and Avoid Damage English
26 Minimize Wear and Avoid
Damage
Observing the instructions in this manual helps
reduce the risk of unnecessary wear and dam‐
age to the power tool.
The power tool must be operated, maintained
and stored with the due care and attention
described in this owner's manual.
The user is responsible for all damage caused by
non-observance of the safety precautions, oper‐
ating and maintenance instructions in this man‐
ual. This includes in particular:
Alterations or modifications to the product not
–
approved by STIHL.
Using tools or accessories which are neither
–
approved or suitable for the product or are of a
poor quality.
Using the product for purposes for which it
–
26.2 Parts Subject to Wear and Tear
Some parts of the power tool are subject to nor‐
mal wear and tear even during regular operation
in accordance with instructions and, depending
on the type and duration of use, have to be
replaced in good time. Among other parts, this
includes:
Cutting attachments (all types)
–
Mounting hardware for cutting attachments
–
(rider plate, nut, etc.)
Deflectors for cutting attachments
–
Clutch
–
Filters (air, fuel)
–
Rewind starter
–
Spark plug
–
Antivibration elements
–
27 Main Parts
was not designed.
Using the product for sports or competitive
–
events.
Consequential damage caused by continuing
–
to use the product with defective components.
26.1 Maintenance Work
All the operations described in the "Maintenance
Chart" must be performed on a regular basis. If
these maintenance operations cannot be per‐
formed by the owner, they should be performed
by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
If these maintenance operations are not carried
out as specified, the user assumes responsibility
for any damage that may occur. Among other
parts, this includes:
Damage to the engine due to neglect or defi‐
–
cient maintenance (e.g. air and fuel filters),
incorrect carburetor adjustment or inadequate
cleaning of cooling air inlets (intake ports, cyl‐
inder fins).
Corrosion and other consequential damage
–
resulting from improper storage.
Damage to the machine resulting from the use
–
of poor quality replacement parts.
0458-460-0121-A 35
1 Tank cap
2 Carburetor adjusting screws
3 Starter grip
4 Manual fuel pump
5 Cover
6 Muffler
7 Machine support
8 Throttle trigger
9 Stop switch
10 Throttle trigger lockout
11 Bike handle (handlebar)
12 Handle support
13 Throttle cable retainer
14 Carrying ring
5
5
8
1
2
6
4
7
2
3
1
1
9
1
002BA644 KN
4
English 28 Specifications
15 Choke lever
16 Air filter cover
17 Fuel tank
18 Loop handle
19 Barrier bar
20 Drive tube
# Serial Number
1 Drive tube
2 Mowing head
3 Deflector for mowing heads only
4 Line limiting blade
5 Deflector for all mowing attachments
6 Skirt for mowing heads
7 Metal mowing attachment
8 Circular saw blade
9 Limit stop for circular saw blades only
28 Specifications
28.1 Engine
STIHL single cylinder four-stroke engine with
mixture lubrication
Displacement:
Bore: 38 mm
Stroke: 25 mm
28.4 cc
Engine power to
ISO 8893:
0.95 kW (1.3 bhp) at
7,000 rpm
Idle speed: 2,800 rpm
Cut-off speed (rated): 9,500 rpm
Max. output shaft speed
7,150 rpm
(cutting attachment):
Valve clearance
Inlet valve: 0.10 mm
Exhaust valve: 0.10 mm
28.2 Ignition System
Electronic magneto ignition
Spark plug (resistor type): Bosch USR 7 AC
Electrode gap: 0.5 mm
28.3 Fuel System
All position diaphragm carburetor with integral
fuel pump
Fuel tank capacity:
710 cc (0.71 l)
28.4 Weight
Dry, without cutting attachment and deflector
FS 89: 5.8 kg
FS 89 R: 5.5 kg
28.5 Sound and Vibration Levels
For details on compliance with the Vibration
Directive 2002/44/EC on employers' obligations,
visit
www.stihl.com/vib
28.5.1 Sound pressure level L
ance with ISO 22868
with mowing head
FS 89 with bike handle: 96 dB(A)
FS 89 R: 96 dB(A)
with metal mowing tool
FS 89 with bike handle: 94 dB(A)
FS 89 R with barrier bar: 94 dB(A)
28.5.2 Sound power level Lw in accordance
with ISO 22868
with mowing head
FS 89 with bike handle: 107 dB(A)
FS 89 R: 107 dB(A)
with metal mowing tool
FS 89 with bike handle: 107 dB(A)
FS 89 R with barrier bar: 107 dB(A)
28.5.3 Vibration level a
hv,eq
with ISO 22867
with mowing head Handle, left Handle,
FS 89 with bike han‐
dle:
FS 89 R:
4.8 m/s
5.6 m/s
in accord‐
peq
in accordance
right
2
3.8 m/s
2
5.3 m/s
2
2
36 0458-460-0121-A
000BA073 KN
29 Maintenance and Repairs English
with metal mowing toolHandle, left Handle,
FS 89 with bike han‐
dle:
FS 89 R with barrier
bar:
The K‑factor in accordance with Directive
2006/42/EC is 2.0 dB(A) for the sound pressure
level and sound power level; the K‑factor in
accordance with Directive 2006/42/EC is
2.0 m/s2 for the vibration level.
4.1 m/s
4.3 m/s
right
2
2
3.2 m/s
4.6 m/s
2
2
28.6 REACH
REACH is an EC regulation and stands for the
Registration, Evaluation, Authorization and
Restriction of Chemical substances.
For information on compliance with the REACH
regulation (EC) No. 1907/2006 see
www.stihl.com/reach
28.7 Exhaust Emissions
The CO2 value measured in the EU type appro‐
val procedure is specified at
www.stihl.com/co2
in the product-specific technical data.
The measured CO2 value was determined on a
representative engine in accordance with a
standardized test procedure under laboratory
conditions and does not represent either an
explicit or implied guarantee of the performance
of a specific engine.
The applicable exhaust emission requirements
are fulfilled by the intended usage and mainte‐
nance described in this User Manual. The oper‐
ating license shall be void if the engine is modi‐
fied in any way.
29 Maintenance and Repairs
Users of this machine may only carry out the
maintenance and service work described in this
user manual. All other repairs must be carried
out by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
When repairing the machine, only use replace‐
ment parts which have been approved by STIHL
for this power tool or are technically identical.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine.
STIHL recommends the use of original STIHL
replacement parts.
Original STIHL parts can be identified by the
STIHL part number, the { logo and the
STIHL parts symbol K (the symbol may appear
alone on small parts).
30 Disposal
Contact the local authorities or your STIHL serv‐
icing dealer for information on disposal.
Improper disposal can be harmful to health and
pollute the environment.
► Take STIHL products including packaging to a
suitable collection point for recycling in accord‐
ance with local regulations.
► Do not dispose with domestic waste.
31 EC Declaration of Con‐
formity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
Germany
declare in exclusive responsibility that the prod‐
uct
Category: Brushcutter
Make: STIHL
Model: FS 89
Serial identification: 4180
Displacement:
conforms to the provisions of Directives
2011/65/EU, 2006/42/EC, 2014/30/EU and
2000/14/EC and has been developed and manu‐
factured in compliance with the following stand‐
ards in the versions valid at the time of produc‐
tion:
FS 89 R
28.4 cm
3
0458-460-0121-A 37
English 31 EC Declaration of Conformity
EN ISO 11806-1, EN 55012, EN 61000‑6‑1
The measured and guaranteed sound power lev‐
els were determined according to Directive
2000/14/EC, Annex V, using the ISO 10884
standard.
Measured sound power level
FS 89: 107 dB(A)
FS 89 R: 107 dB(A)
Guaranteed sound power level
FS 89: 109 dB(A)
FS 89 R: 109 dB(A)
Technical documents deposited at:
ANDREAS STIHL AG & Co. KG
Produktzulassung (Product Licensing)
The year of manufacture and serial number are
applied to the product.
Done at Waiblingen, 15.07.2020
ANDREAS STIHL AG & Co. KG
Dr. Jürgen Hoffmann
Director Product Certification & Regulatory
Affairs
38 0458-460-0121-A
31 EC Declaration of Conformity English
0458-460-0121-A 39
www.stihl.com
*04584600121A*
0458-460-0121-A
*04584600121A*
0458-460-0121-A
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