STIHL FS 70
{
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 36
F Notice d’emploi
37 - 75
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness 11
Mounting the Loop Handle 12
Mounting the Deflector 13
Mounting the Cutting Attachment 14
Original Instruction ManualPrinted on chlorine-free paper
Fuel 16
Fueling 17
Fitting the Harness 20
Starting / Stopping the Engine 20
Operating Instructions 23
Cleaning the Air Filter 23
Engine Management 24
Adjusting the Carburetor 24
Spark Plug 25
Engine Running Behavior 26
Rewind Starter 26
Storing the Machine 26
Sharpening Metal Cutting Blades 27
Printing inks contain vegetable oils, paper can be recycled.
Inspections and Maintenance by
Dealer 27
Maintenance and Care 28
Main Parts 30
Specifications 32
Special Accessories 33
Maintenance and Repairs 33
Disposal 34
STIHL Limited Emission Control
Warranty Statement 34
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
This machine has been built using
modern production techniques and
comprehensive quality assurance.
Every effort has been made to ensure
your satisfaction and troublefree use of
the machine.
Please contact your dealer or our sales
company if you have any queries
concerning your machine.
Your
Hans Peter Stihl
{
© ANDREAS STIHL AG & Co. KG, 2012
0458-570-8221-D. VA0.H12.
0000002190_006_GB
FS 70 RC
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
Pictograms
The meanings of the pictograms
attached to the machine are explained in
this manual.
Depending on the model concerned, the
following 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
Pictograms
All the pictograms attached to the
machine are shown and explained in this
manual.
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.
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 manual.
Safety Precautions and
Working Techniques
Some special safety precautions have to be
observed when working
with this power tool
because of the very high
speed of the cutting
attachment.
It is important you read
and understand the
instruction manual before
first use and keep the
manual in a safe place for
future reference. Nonobservance of the
instruction manual may
result in serious or even
fatal injury.
Observe all application local safety
regulations, standards and ordinances.
If you have not used this type of power
tool before: Have your dealer or other
experienced user show you how to
operate your power tool or attend a
special course in its operation.
Minors should never be allowed to use a
power tool.
Keep bystanders, especially children,
and animals away from the work area.
When the power tool is not in use, shut it
off so that it does not endanger others.
Secure it against unauthorized use.
The user is responsible for avoiding
injury to third parties or damage to their
property.
2
FS 70 RC
English
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
To operate the power tool you must be
rested, in good physical condition and
mental health.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.
Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. STIHL
recommends that persons with
pacemakers consult their physician and
the pacemaker manufacturer to reduce
any health risk.
Do not operate the power tool if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
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.
Do not use your power tool for any other
purpose because of the increased risk of
accidents.
Only use cutting attachments and
accessories that are explicity approved
for this power tool model by STIHL or
are technically identical. If you have any
questions in this respect, consult a
servicing dealer. Use only high quality
parts and accessories in order to avoid
the risk of accidents and damage to the
machine.
STIHL recommends the use of original
STIHL replacement parts. They are
specifically designed to match your
model 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.
The deflector on this power tool cannot
protect the operator from all objects
thrown by the cutting attachment
(stones, glass, wire, etc.). Such objects
may ricochet and then hit the operator.
Do not use a pressure washer to clean
the power tool. The solid jet of water
may damage parts of the power tool.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Clothing must be sturdy
but allow complete freedom of movement. Wear
snug-fitting clothing, an
overall and jacket combination, do not wear a
work coat.
Avoid clothing that could get caught on
branches or brush or moving parts of the
machine. Do not wear a scarf, necktie or
jewelry. Tie up and confine long hair
(e.g. with a hair net, cap, hard hat, etc.).
Wear steel-toed safety
boots with non-slip soles.
Sturdy shoes with non-slip soles may be
worn as an alternative only when using
mowing heads.
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. To
reduce the risk of injury
from thrown objects,
always wear a face shield
and safety glasses.
A face shield alone does not provide
adequate eye protection.
Wear hearing protection, e.g. earplugs
or ear muffs.
Wear heavy-duty gloves.
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
FS 70 RC
3
English
002BA271 KN
002BA272 KN
Transporting the Power Tool
Always stop the engine.
Carry the unit hanging from the shoulder
strap or properly balanced by the drive
tube. Fit transport guard on metal cutting
attachments to avoid the risk of injury
from blade contact
To reduce the risk of serious burn injuries, avoid
touching hot parts of the
machine, including the
gearbox housing.
In vehicles: Properly secure your power
tool to prevent turnover, fuel spillage and
damage.
Fueling
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.
Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly and avoid fuel spillage.
Fuel your power tool only in wellventilated areas. If you spill fuel, wipe
the machine immediately – if fuel gets on
your clothing, change immediately.
Your power tool comes standard with
either a screw-type or bayonet-type fuel
cap.
After fueling, tighten
down the screw-type fuel
cap as securely as
possible.
After fueling, insert the
fuel cap with hinged grip
(bayonet-type cap) correctly in the opening, turn
it clockwise as far as stop
and fold the grip down.
This reduces the risk of unit vibrations
causing the fuel cap to loosen or come
off and spill quantities of fuel.
To reduce the risk of serious or fatal
burn injuries, check for fuel leakage. If
fuel leakage is found, do not start or run
the engine until leak is fixed.
Before Starting
Check that your power tool is properly
assembled and in good condition – refer
to appropriate chapters in the instruction
manual.
– Use only an approved combination
of cutting attachment, deflector,
handle and harness. All parts must
be assembled properly and
securely.
– The stop switch / slide control must
move freely.
– Check smooth action of choke
knob, throttle trigger lockout and
throttle trigger – the throttle trigger
must return automatically to the idle
position. The choke lever must
spring back from the g and <
positions to the run position F when
the throttle trigger lockout and
throttle trigger are squeezed.
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Cutting tool or attachment: Check
for correct and secure assembly
and good condition.
– Check protective devices (e.g.
deflector for cutting attachment,
rider plate) for damage or wear.
Always replace damaged parts. Do
not operate your machine with a
damaged deflector or worn rider
plate (lettering and arrows no longer
legible).
– Never attempt to modify the controls
or safety devices in any way.
4
FS 70 RC
English
002BA257 KN
002BA273 KN
15m (50ft)
– Keep the handles dry and clean –
free from oil and dirt – for safe
control of the power tool.
– Adjust the harness and handle(s) to
suit your height and reach. See
chapters on "Fitting the Harness"
and "Balancing the Machine".
To reduce the risk of personal injury, do
not operate your power tool if it is
damaged or not properly assembled.
If you use a shoulder strap or full
harness: Practice removing and putting
down the power tool as you would in an
emergency. To avoid damage, do not
throw the machine to the ground when
practising.
Starting the Engine
Start the engine at least 3 meters from
the fueling 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.
Your power tool is a one-person unit. To
reduce the risk of injury from thrown
objects, do not allow other persons
within a radius of 15 meters of your own
position – even when starting.
To reduce the risk of
injury, avoid contact with
the cutting attachment.
Do not drop start the
power tool – start the
engine as described in
the instruction manual.
Note that the cutting
attachment continues to
run for a short period
after you let go of the
throttle trigger – flywheel
effect.
Check idle speed setting: The cutting
attachment must not rotate when the
engine is idling with the throttle trigger
released.
To reduce the risk of fire, keep hot
exhaust gases and hot muffler away
from easily combustible materials (e.g.
wood chips, bark, dry grass, fuel).
Holding and Controlling the Power Tool
Always hold the power tool firmly with
both hands on the handles.
Make sure you always have good
balance and secure footing.
Models with bike handle
Right handle on control handle, left hand
on left handle.
Models with loop handle
Left hand on loop handle, right hand on
control handle, even if you are lefthanded.
During Operation
Make sure you always have good
balance and secure footing.
In the event of impending danger or in
an emergency, switch off the engine
immediately – move the stop switch /
slide control in the direction of 0.
To reduce the risk of injury, do not allow
any other persons within a radius of
15 meters of your own position. To
reduce the risk of damage to property,
also maintain this distance from other
objects (vehicles, windows).
The correct engine idle speed is
important to ensure that the cutting
attachment stops rotating when you let
go of the throttle trigger.
FS 70 RC
5
English
Check and correct the idle speed setting
at regular intervals. If the cutting
attachment still rotates at idle speed,
have your dealer make proper
adjustments or repairs. STIHL
recommends a STIHL servicing dealer.
Take special care in slippery conditions,
on slopes or uneven ground.
Watch out for obstacles: Roots, tree
stumps or holes which could cause you
to trip or stumble.
Always stand on the ground while
working, never on a ladder, work
platform or any other insecure support.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
To reduce the risk of accidents, take a
break in good time to avoid tiredness or
exhaustion.
Work calmly and carefully – in daylight
conditions and only when visibility is
good. Stay alert so as not to endanger
others.
Your power tool produces
toxic exhaust fumes as
soon as the engine is
running. These fumes
may be colorless and
odorless and contain
unburned hydrocarbons
and benzol. Never run
the engine indoors or in
poorly ventilated locations, 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 confined
locations.
To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.
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. Note that combustible fuel
vapor may escape from the fuel system.
The dusts, vapor and smoke produced
during operation may be dangerous to
health. If the work area is very dusty or
smoky, wear a respirator.
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 the fuel system in particular for
leaks and make sure the safety devices
are working properly. Do not continue
operating your power tool if it is
damaged. In case of doubt, have the unit
checked by your servicing dealer.
Do not operate your power tool with the
choke lever in the warm start position <
– the engine speed cannot be controlled
in this position.
To reduce the risk
of injuryfrom
thrown objects,
never operate the
unit without the
proper deflector for
the type of cutting
attachment being
used.
Inspect the work area:
Stones, pieces of metal
or other solid objects can
be thrown and cause personal injury or damage
the cutting attachment
and property (e.g. parked
vehicles, windows).
Special care must be taken when
working in difficult, over-grown terrain.
When cutting high scrub, under bushes
and hedges: Keep cutting attachment at
minimum height of 15 cm to avoid
harming small animals.
Always shut off the engine before
leaving the unit unattended.
Check the cutting attachment at regular
short intervals during operation or
immediately if there is a noticeable
change in cutting behavior:
– Turn off the engine. Hold the unit
firmly and wait for the cutting
attachment to come to a standstill.
– Check condition and tightness, look
for cracks.
6
FS 70 RC
English
– Check sharpness.
– Replace damaged or dull cutting
attachments immediately, even if
they have only superficial cracks.
Clean grass and plant residue off the
cutting attachment mounting at regular
intervals – remove any build up of
material from the cutting attachment and
deflector.
To reduce the risk of injury, shut off the
engine before replacing the cutting
attachment.
The gearbox becomes
hot during operation. To
reduce the risk of burn
injury, do not touch the
gearbox housing.
Do not continue using or attempt to
repair damaged or cracked cutting
attachments by welding, straightening or
modifying the shape (out of balance).
This may cause parts of the cutting
attachment to come off and hit the
operator or bystanders at high speed
and result in serious or fatal injuries.
When using mowing heads
Equip the deflector with the additional
components specified in the instruction
manual.
Use only the deflector with properly
mounted line limiting blade to ensure the
mowing lines are automatically trimmed
to the approved length.
To reduce the risk of injury, always turn
off the engine before adjusting the nylon
line of manually adjustable mowing
heads
Using the unit with over-long nylon
cutting lines reduces the motor's
operating speed. The clutch then slips
continuously and this causes
overheating and damage to important
components (e.g. clutch, polymer
housing components) – and this can
increase the risk of injury from the
cutting attachment rotating while the
engine is idling.
When using metal cutting attachments
STIHL recommends the use of original
STIHL metal cutting attachments. They
are specifically designed to match your
model and meet your performance
requirements.
Metal cutting attachments rotate at very
high speed. The forces that occur act on
the machine, the attachment and the
material being cut.
Sharpen metal cutting attachments
regularly as specified.
Unevenly sharpened metal cutting
attachments cause out-of-balance
which can impose extremely high loads
on the machine and increase the risk of
breakage.
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.
Inspect metal cutting attachments for
cracks or warping after every contact
with hard objects (e.g. stones, rocks,
pieces of metal). To reduce the risk of
injury, remove burrs and other visible
build-ups of material (use a file) because
they may become detached and be
thrown at high speed during operation.
To reduce the above-mentioned risks
when using a metal cutting attachment,
never use a metal cutting attachment
with a diameter larger than specified. It
must not be too heavy. It must be
manufactured from materials of
adequate quality and its geometry must
be correct (shape, thickness).
To reduce the risk of injury, a metal
cutting attachment not manufactured by
STIHL must not be heavier, thicker,
have a different shape or a diameter
larger than the largest metal cutting
attachment approved by STIHL for this
power tool model.
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 circulation (symptoms:
frequently cold fingers, tingling
sensations).
– Low outside temperatures.
– The force with which the handles
are held (a tight grip restricts
circulation).
FS 70 RC
7
English
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.
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 performed by a
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized 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 genuine
STIHL replacement parts. These parts
are specifically designed to match your
machine 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
adjustments.
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 intervals.
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 condition, 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.
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
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 tool and deflector.
Use deflector in
combination with
mowing heads
only. Do not use
metal cutting
attachments.
Do not use deflector with
brush knives or circular
saw blades.
Do not use deflector with
mowing heads.
Use deflector in combination with grass cutting
blades only.
8
FS 70 RC
English
000BA015 KN
002BA049 KN
Shoulder strap
N Use a shoulder strap.
N With the engine running, attach the
machine to the shoulder strap.
Grass cutting blades must always be
used in combination with a shoulder
strap.
Mowing Head with Nylon Line
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 leaflet. Refill the mowing
head with nylon line as described in the
instruction leaflet.
N If the raised moldings (1) on the
base of the attachment are worn as
shown in the illustration (above
right), do not continue using the
mowing head. Install a new one.
There is otherwise a risk of injury
from thrown parts of the head.
STIHL Polycut Mowing Head with
Polymer Blades
For mowing unobstructed edges of
meadows (without posts, fences, trees
or similar obstacles).
Check the wear limit marks!
FS 70 RC
WARNING
To reduce the risk of serious injury,
never use wire or metal-reinforced line in
place of the nylon line.
STIHL FixCut
Check the wear limit marks!
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.
9
English
002BA135 KN
000BA020 KN
It is important to follow the maintenance
instructions 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.
WARNING
Never use wire in place of the nylon
mowing line – risk of injury.
Risk of Kickout (Blade Thrust) with Metal
Cutting Blades
When using grass cutting blades there is
a risk of kickout when the rotating blade
comes into contact with a solid object
like a tree trunk, branch, tree stump,
rock or similar. The machine is thrown to
the right or to the rear – opposite to the
blade's direction of rotation.
Grass Cutting Blade
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.
The risk of kickout is greatest when the
black area of the rotating blade comes
into contact with a solid object.
10
FS 70 RC
Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
547BA033 KN
1
2
5
8
3
9
13
12
10
15
18
16
4
7
17
17
18
18
6
11
14
13
14
15
Cutting Attachment Deflector Handle Harness
English
FS 70 RC
11
English
547BA004 KN
547BA005 KN
Approved Combinations
Select correct combination from the
table according to the cutting
attachment you intend to use.
WARNING
For safety reasons only the cutting
attachments, deflectors, handles and
harnesses/shoulder straps shown in
each row of the table may be used
together. No other combinations are
permitted because of the risk of
accidents.
Cutting Attachments
Mowing heads
1 STIHL SuperCut 20-2 mowing head
2 STIHL Autocut C 25-2 mowing head
3 STIHL Autocut 25-2 mowing head
4 STIHL TrimCut 31-2 mowing head
5 STIHL PolyCut 20-3 mowing head
6 STIHL FixCut 25-2 mowing head
Metal cutting attachments
7 Grass cutting blade 230-2
8 Grass cutting blade 230-4
9 Grass cutting blade 230-8
WARNING
Non-metal grass cutting blades are not
approved.
11 Deflector for grass cutting blades
only
Handles
12 Loop handle
13 Loop handle with
14 Barrier bar
15 Bike handle
Harnesses
16 Shoulder strap may be used
17 Shoulder strap must be used
18 Full harness may be used
Mounting the Loop Handle
A factory-new machines comes with the
loop handle aready mounted.
Using the Barrier Bar
A barrier bar may have to be mounted to
suit the tool you intend to use – see
"Approved Combinations of Cutting
Attachment, Deflector, Handle and
Harness".
The barrier bar comes standard with the
machine or is available as a special
accessory.
Deflectors
10 Deflector with blade for mowing
heads only
12
FS 70 RC
English
5,3 mm
547BA006 KN
1
2
3
547BA007 KN
A
002BA262 KN
1
002BA263 KN
2
Mounting the Barrier Bar
N Fit the washer (1) on the M5x23
screw (2).
N Hold the barrier bar (3) against the
loop handle and insert the screw
with washer.
N Tighten down the screw (2) firmly.
Leave the barrier bar permanently
mounted to the loop handle.
Adjusting and Securing the Loop Handle
The loop handle can be adjusted to suit
the height and reach of the operator and
the application by changing
distance (A).
Recommended distance (A):
about 35 cm
N Loosen the screw on the handle.
N Slide the handle to the required
position.
N Tighten down the screw so that the
handle cannot be rotated on the
drive tube.
Mounting the Deflector
Use the right deflector
WARNING
Deflector (1) is approved for mowing
heads only and must therefore be
mounted before fitting a mowing head
FS 70 RC
WARNING
Deflector (2) is approved for grass
cutting blades only and must therefore
be mounted before fitting a grass cutting
blade.
Mounting the Deflector
Deflectors (1) and (2) are both mounted
to the gearbox in the same way.
13
English
0414BA007 KN
002BA342 KN
2
3
1
002BA346 KN
2
N Position the deflector against the
gearbox so that the lug (3) engages
the recess (4) in the deflector.
N Insert the screw (5) and tighten it
down firmly.
Mounting the Cutting
Attachment
The new machine comes from the
factory wirth the cutting attachment
already mounted.
Note the following points when mounting
other approved cutting attachments –
see "Approved Combinations of Cutting
Attachment, Deflector, Handle,
Harness":
Preparations
N Lay your brushcutter on its back so
that the cutting attachment
mounting face is facing up.
Block the shaft.
The stop pin or screwdriver (2) are either
supplied with the machine or available
as special accessories.
N Insert the stop pin (2) or
screwdriver (2) in the hole (3) in the
gearbox as far as stop – and apply
slight pressure.
N Rotate nut or cutting attachment on
the shaft until the stop pin slips into
position and blocks the shaft.
Mounting the cutting attachment
WARNING
Use a deflector that matches the cutting
attachment – see "Mounting the
Deflector".
N Go to "Mounting the Mowing Head"
or "Mounting the Metal Cutting
Attachment".
Mounting the mowing head
Keep the instruction leaflet for the
mowing head in a safe place.
STIHL SuperCut 20-2
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
14
The output shaft (1) must be blocked
with the stop pin (2) or screwdriver (2) to
mount or remove cutting attachments.
FS 70 RC
English
1
002BA081 KN
1
3
2
681BA050 KN
STIHL TrimCut 31-2,
STIHL FixCut 25-2,
STIHL PolyCut 20-3
N Screw the mowing head
counterclockwise on to the shaft (1)
as far as stop.
N Block the drive shaft.
N Tighten down the mowing head.
STIHL TrimCut 31-2,
STIHL FixCut 25-2,
STIHL PolyCut 20-3
N Unscrew the mowing head
clockwise.
Adjusting nylon line
STIHL SuperCut
Fresh line is advanced automatically if
remaining line is still at least 6cm long.
The blade on the deflector trims surplus
line to the correct length.
STIHL AutoCut
N Hold the rotating mowing head
above the ground – tap it on the
ground once – about 3cm fresh line
is advanced.
The blade on the deflector trims surplus
line to the correct length – avoid tapping
the mowing head more than once at a
time.
Line feed operates only if both mowing
lines still have a minimum length of
2.5 cm.
Replacing Nylon Line or Cutting Blades
Refer to the instructions supplied with
the mowing head.
Mounting metal cutting attachments
Check direction of rotation of cutting
attachment
NOTICE
Remove the tool used to block the shaft.
Removing the mowing head
N Block the drive shaft.
STIHL SuperCut 20-2,
STIHL AutoCut 25-2,
STIHL AutoCut C 25-2,
FS 70 RC
All other mowing heads
Refer to the instructions supplied with
the mowing head.
WARNING
To reduce the risk of injury, always shut
off the engine before adjusting the
mowing line by hand.
Cutting edges of grass cutting blades (1)
and (2) may point in either direction.
Cutting edges of grass cutting blade (3)
must point clockwise.
WARNING
Direction of rotation is indicated by an
arrow on the inside of the deflector.
15
English
681BA051 KN
6
9
7
8
5
4
N Place the cutting attachment (4) on
the thrust plate (5).
WARNING
Collar (see arrow) must engage the
cutting attachment's mounting hole.
Securing the cutting attachment
N Fit the thrust washer (6) and rider
plate (7) on the shaft (8).
N Block the shaft and screw the
mounting nut (9) on to the shaft
counterclockwise and tighten it
down firmly.
WARNING
If the mounting nut turns too freely, fit a
new one.
Removing the metal cutting attachment
N Block the shaft.
N Unscrew the mounting nut
clockwise.
N Take the parts off the shaft – do not
remove the thrust plate (5).
Fuel
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 (R+M)/2.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
Fuel with a lower octane rating 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
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
16
FS 70 RC
English
002BA456 KN
002BA418 KN
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke aircooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped with a catalytic converter.
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.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
liters liters (ml)
10.02(20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
filler cap is facing up.
A number of different filler caps are
installed as standard at the factory.
Fuel mix ratio
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
FS 70 RC
Cliplock filler cap (bayonet-type)
17
English
002BA419 KN
001BA218 KN
001BA219 KN
001BA224 KN
001BA220 KN
001BA221 KN
001BA222 KN
001BA223 KN
Threaded filler cap
Opening tank cap with hinged grip
N Swing the grip to the upright
position.
N Rotate the cap about 1/4 turn
counterclockwise.
N Remove the cap.
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 nozzle for fuel (special accessory).
N Filling up with fuel
Closing tank cap with hinged grip
Grip must be vertical:
N Fit the cap in the opening – the
marks on the cap and filler neck
must line up.
N Press the cap down as far as stop.
N While holding the cap depressed,
turn it clockwise until it engages in
position.
N Fold the grip flush with the top of the
cap.
Checking security of cap
– The lug on the grip must fully
engage the recess (arrow).
18
FS 70 RC
English
001BA225 KN
001BA227 KN
001BA226 KN
002BA447 KN
002BA448 KN
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
nozzle (special accessory).
Closing screw-type tank cap
N Grip the cap – it is properly locked if
it cannot be turned or removed.
If the cap can be turned or removed
Bottom of cap is twisted in relation to
top:
Left: Bottom of cap twisted
Right: Bottom of cap correctly
positioned
N Place the cap on the opening and
rotate it counterclockwise until it
engages the filler neck.
N Continue rotating the cap
counterclockwise (about a quarter
turn) – this causes the bottom of the
cap to be turned to the correct
position.
N Turn and lock the cap clockwise –
see sections on "Closing" and
"Checking security of cap".
Opening screw-type tank cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the cap.
N Place the cap in the opening.
N Turn the cap clockwise as far as
stop and tighten it down as firmly as
possible by hand.
FS 70 RC
19
English
1
002BA268 KN
2
3
Fitting the Harness Starting / Stopping the
Full harness
Engine
The type and style of the harness
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".
Shoulder strap
N Put on the full harness (1).
N Adjust the length of the strap so that
the spring hook (2) is about a hand’s
width below your right hip.
N Balance the trimmer/brushcutter.
Controls
Version with Bike Handle
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and 0 =Stop
positions.
N Put on the shoulder strap (1).
N Adjust the length of the strap so that
the spring hook (2) is about a hand’s
width below your right hip.
N Balance the trimmer/brushcutter.
20
FS 70 RC
English
0414BA011 KN
1
3
2
4
547BA015 KN
5
547BA016 KN
5
547BA017 KN
0414BA012 KN
Version with Loop Handle
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and 0 = Stop
positions.
Function of Stop Switch and Ignition
System
The stop switch is normally in the Run
position: Ignition is on in this position –
the engine is ready to start and may be
started. If the stop switch is moved to
the 0 position, the ignition is switched
off. It is automatically switched on again
after the engine comes to a standstill.
Starting the Engine
N Press the fuel pump bulb (4) at least
five times – even if the bulb is filled
with fuel.
Cold Engine (cold start)
N Press in the choke lever (5) and turn
it to g at the same time.
Warm Engine (warm start)
Also use this setting if the engine has
been running but is still cold.
Cranking
N Place the unit on the ground: It must
rest securely on the engine support
and the deflector. Check that the
cutting attachment is not touching
the ground of any other obstacles.
N Make sure you have a safe and
secure footing.
N Hold the unit firmly on the ground
with your left hand and press down
– do not touch the throttle trigger or
lockout lever.
NOTICE
Do not stand or kneel on the drive tube.
FS 70 RC
N Press in the choke lever (5) and turn
it to < at the same time.
21
English
0414BA013 KN
0414BA014 KN
N Pull the starter grip slowly with your
right hand 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.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
N Continue cranking until the engine
runs.
As Soon as Engine Runs
N 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
Make sure the carburetor is correctly
adjusted. The cutting attachment must
not rotate when the engine is idling.
Your machine is now ready for
operation.
Shut off the engine.
N Move the stop switch in the direction
of 0 – the engine stops – release
the stop switch – it springs back to
the run position.
Other Hints on Starting
Engine does not start in warm start
position <
N Move the choke lever to g and
continue cranking until the engine
runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Fuel tank run until completely dry
N After refueling, press the fuel pump
bulb at least five times – even if the
bulb is filled with fuel.
N Set the choke lever to suit the
engine temperature.
N Start the engine.
22
Engine stalls in cold start position g or
under acceleration
N Move the choke lever to < and
continue cranking until the engine
runs.
FS 70 RC
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