Page 1
{
STIHL SP 90
Instruction Manual
Page 2
Page 3
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Approved Power Tool Attachments 7
Using the Unit 7
Assembling the Unit 8
4-MIX Engine 10
Fuel 10
Original Instruction ManualPrinted on chlorine-free paper
Fueling 12
Fitting the Harness 13
Backpack Carrying System 14
Starting / Stopping the Engine 14
Operating Instructions 16
Replacing the Air Filter 17
Adjusting the Carburetor 17
Spark Arresting Screen in Muffler 19
Spark Plug 20
Replacing the Starter Rope and
Rewind Spring 21
Storing the Machine 23
Inspection and Maintenance by
User 23
Printing inks contain vegetable oils, paper can be recycled.
Inspections and Maintenance by
Dealer 24
Maintenance and Care 26
Minimize Wear and Avoid Damage 28
Main Parts 29
Specifications 30
Special Accessories 31
Maintenance and Repairs 31
EC Declaration of Conformity 32
Quality Certification 32
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
0458-414-0121-D. VA0.L12.
0000001040_012_GB
SP 90
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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 manual fuel
pump
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
Special safety precau
tions must be observed
when working with this
power tool because the
rakes and tines move at a
high stroke rate.
It is important you read
and understand the
instruction manual before
using your unit for the
first time and keep the
manual in a safe place for
future reference. Nonobservance of the safety
precautions may result in
serious or even fatal
injury.
Observe all applicable 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.
-
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SP 90
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002BA316 KN
Do not lend or rent your power tool
without the instruction manual. Be sure
than anyone using your power tool
understands the information contained
in this manual.
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. To
reduce health risks, STIHL recommends
that persons with pacemakers consult
their physician and the pacemaker
manufacturer before operating this tool.
Do not operate the power tool if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
Use your power tool only for harvesting
fruit about the size of coffee berries,
nuts, olives, sloes, etc.
It must not be used for any other
purpose because of the increased risk of
accidents and damage to the machine.
Never attempt to modify your power tool
in any way since this may result in
accidents or damage to the machine.
Only mount tools and accessories that
are explicity approved for this power tool
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.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Clothing must be sturdy
but allow complete free
-
dom of movement. Wear
snug-fitting clothing, e.g.
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 sturdy shoes with non-slip soles.
Wear a safety hard hat
where there is a danger
of head injuries from fall
ing objects. To reduce
the risk of injury from
thrown objects, always
wear a face shield and
safety glasses.
Warning! A face shield alone does not
provide adequate eye protection.
Wear hearing protection, e.g. earplugs
or ear muffs.
Wear heavy-duty gloves,
preferably made of
leather.
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
Transporting the Power Tool
Always stop the engine.
Carry the unit suspended from the
shoulder strap or by the drive tube.
Avoid touching hot parts of the machine,
especially the muffler and gear housing
– you could suffer serious burns.
Transporting in a vehicle: 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.
SP 90
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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.
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.
– Slide control / stop switch must
move easily to STOP or 0
– Smooth action of throttle trigger
interlock (if fitted) and throttle trigger
– the throttle trigger must return
automatically to the idle position.
– Rakes and tines: Securely mounted
and in good condition (clean, not
bent or cracked).
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Never attempt to modify the controls
or the safety devices in any way.
– Keep the handles dry and clean,
free from oil and dirt, for safe
control.
– Adjust the harness to suit your
height and reach. See chapter on
"Fitting the Harness".
To reduce the risk of personal injury, do
not operate your machine if it is
damaged or not properly assembled.
If you use a shoulder strap or full
harness: Practise removing and putting
down the machine 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 rakes and tines must be
clear of the ground and all other
obstructions because they may begin to
run when the engine starts – allow
sufficient clearance for movement of the
rakes and tines.
Your power tool a one-person unit. To
reduce the risk of injury from fall falling
branches or contact with the rakes and
tines, do not allow other persons within a
radius of 5meters of your own position –
even when starting.
To reduce the risk of injury, avoid
contact with the rakes and tines.
Do not drop start the power tool – start
the engine as described in the
instruction manual.
Note that the rakes and tines continue to
run for a short period after you let go of
the throttle trigger (flywheel effect).
Check idle speed setting: The rakes and
tines must not move 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).
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002BA318 KN
002BA317 KN
Holding and Controlling the Power Tool
Always hold the unit firmly with both
hands on the handles. Make sure you
always have good balance and secure
footing.
Wrap your fingers and thumbs around
the handles. Right hand on control
handle, left hand on handle hose on
drive tube, even if you are left-handed.
The machine can be carried on a
harness to relieve the weight on the
operator's arms.
During Operation
In the event of impending danger or in
an emergency, switch off the engine
immediately by moving the slide control
/ stop switch to STOP or 0.
To reduce the risk of injury from falling
objects, do not allow bystanders within a
radius of 5 meters of your own position.
To reduce the risk of damage to
property, also maintain this distance
from other objects (vehicles, windows).
Make sure the idle speed setting is
correct. The rakes and tines must not
move when the engine is idling with the
throttle trigger released.
Check and correct the idle speed setting
at regular intervals. If the rakes and tines
still move, have your dealer check your
machine and make proper adjustments
or repairs.
Take special care in slippery conditions
on slopes and uneven ground.
Clear away fallen branches and scrub.
Watch out for obstacles: Roots, tree
stumps or holes which could cause you
to trip or stumble.
Make sure you always have good
balance and secure footing.
When working at heights:
– Always use a lift bucket
– Never work on a ladder
– Never work in a tree
– Never work on an insecure support
– Never operate your unit with one
hand
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 odorless and
invisible. Never run the
engine indoors or in
poorly ventilated loca
-
tions, even if your model
is equipped with a cata
-
lytic converter.
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.
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
machine checked by your servicing
dealer.
Do not operate your power tool with the
starting throttle lock engaged – engine
speed cannot be controlled in this
position.
Before leaving the power tool
unattended: Shut off the engine.
If the rakes and tines become blocked:
Let go of throttle trigger – shut off the
engine – clear the blockage.
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Opening the throttle while the rakes and
tines are blocked increases the load and
reduces engine 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 rakes
and tines moving while the engine is
idling.
Keep the rakes and tines clear of foreign
objects – such objects may be caught
and thrown and damage the rakes and
tines.
Check the rakes and their tines at
regular short intervals or immediately if
there is a notceable change in the tool's
behavior:
– Shut off the engine and hold the unit
firmly.
– Check condition and tightness, look
for cracks.
– Replace damaged parts
immediately, even if they have only
superficial cracks.
– To reduce the risk of injury, always
shut off the engine and remove the
spark plug boot before replacing the
tines or rake with tines.
Never continue using or attempt to
repair damaged or cracked rakes or
tines.
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).
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. They are
specifically designed to match your
model and meet your performance
requirements.
To reduce the risk of injury, always shut
off the engine before carrying out any
maintenance or repairs or cleaning the
machine. – Exception: Carburetor and
idle speed adjustments.
Do not turn the engine over on the
starter with the spark plug boot or spark
plug removed unless the slide control /
stop switch is on STOP or 0 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.
Vibration behavior is influenced by the
condition of the AV elements – check the
AV elements at regular intervals.
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SP
228BA043 KN
1
414BA002 KN
32
414BA003 KN
3
Approved Power Tool
Attachments
The following STIHL attachments may
be mounted to the basic power tool:
Power tool
attachment Application
SP Special harvester
HL 0° Hedge trimmer
Mounting the attachment
The mounting procedure is described in
the instruction manual supplied with the
power tool attachment.
Using the Unit
This power tool is used for harvesting
nuts and fruits.
The influences of ripeness, variety and
size of fruits or nuts determines whether
this power tool is suitable for harvesting.
The performance of this special
harvester is affected by the abovementioned factors.
This unit is not recommended for
harvesting dessert fruit, e.g. apples,
pears, plums, etc.
WARNING
Do not operate the unit if one of the
tines (1) is missing or broken. Operating
the unit with broken and/or missing
tines (1) may result in the operator being
exposed to high loads caused by
increased vibration – see "Vibrations".
NOTICE
The forkhead (2) performs rapid
reciprocating movements during
operation. Take care not to damage
branches with the forkhead. Do not force
branches between the rakes (3).
Working Technique
Use the following working technique to
obtain best results and good
performance from the harvester:
N Accelerate the engine and comb the
branches with the rakes. Use the
throttle trigger to obtain the optimum
rake stroke rate.
N Keep the throttle open only as long
as the rakes are engaged in the
branches.
N Do not accelerate the engine when
the rakes are not engaged in the
branches.
N Reposition the rakes in the next
section of the tree.
N Repeat this process for all sections
of the tree.
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414BA004 KN
414BA005 KN
1
414BA006 KN
1
414BA007 KN
1
413BA014 KN
N Pay attention to the tree's limb
structure during operation:
– Comb the lower section (A) from the
top downwards, this also applies for
drooping branches at the outer
extremities of the tree.
– Comb the upper section (B) from
the bottom upwards.
– Comb the tree from the inside
outwards, towards the tips of the
branches.
N While combing the branches, turn
the rakes to and fro around the
shaft's axis (C) if necessary.
N Have the whole tree even if there is
very little fruit left on it.
N Do not hold the unit in one spot for
too long so as not to damage leaves
and branches unnecessarily.
N Always shut off the engine before
leaving the unit unattended.
NOTICE
Operating the unit with broken and/or
missing tines (1) may result in damage
to gearbox components or overload
them. Therefore, do not continue using a
unit with broken and/or missing tines.
Operating the unit with broken and/or
missing tines reduces the unit's
harvesting performance.
N Always replace damaged tines –
see chapter on "Inspection and
Maintenance by User".
Assembling the Unit
Mounting the Gearbox
N Place the power tool on the ground
so that it rests on the machine
support (arrow).
N Loosen the clamp screws (1) on the
gearhead – do not remove them.
N Pull the protective cap off the end of
the drive tube.
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002BA248 KN
413BA015 KN
A
414BA008 KN
2
3
414BA009 KN
414BA010 KN
414BA025 KN
1
2
The plug may come out of the drive tube
when you pull off the cap. Push it back
into the drive tube as far as stop.
N Apply a mark (with pencil or crayon)
at distance A (40 mm) from the end
of the drive tube.
N Push the gearhead (2) onto the
drive tube (3) – turn it back and forth
at the same time – until it reaches or
covers the mark on the drive tube.
Alternative check: The drive tube is
correctly positioned when it completely
closes the slot in the gearhead’s clamp
(short arrows).
N Line up the gearhead parallel to the
machine support or level with the
ground.
N Tighten down the clamp screws on
the gearhead firmly.
Installing the Tines
N Screw the tines (1) into the two
rakes (2) as far as stop – fit all eight
tines on the rakes.
N Tighten down the tines by hand.
The machine comes standard with 10
tines. Eight tines are fitted and the other
two are spares for maintenance, see
"Inspection and Maintenance by User".
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414BA026 KN
16 mm
2
4
1
3
414BA024 KN
1
3
4-MIX Engine Fuel
N Engage the combination wrench (3)
on the hexagon (4) at the base of
tine (1).
N Use the combination wrench (3) to
tighten down the tine (1) firmly by
turning it another 30° to 40°.
N Remove the combination wrench
from the tine.
The STIHL 4-MIX engine features
mixture lubrication and must be run on a
fuel mixture of gasoline and engine oil.
It operates otherwise on the 4-stroke
principle.
The engine requires a mixture of
gasoline and engine oil.
WARNING
Avoid direct skin contact with and
breathing in of gasoline fumes.
STIHL MotoMix
STIHL recommends using STIHL
MotoMix. This pre-blended fuel is free of
benzene and lead, stands out because
of a high octane rating, and always
provides the proper mixing ratio.
STIHL MotoMix is blended with STIHL
HP Ultra two-stroke engine oil for
maximum engine life.
MotoMix is not available in all markets.
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 poor quality gasoline or
engine oil is used.
Gasoline
Use only high-quality gasoline with an
octane rating of at least 90 ROC –
leaded or unleaded.
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Unleaded gasoline must be used in
machines equipped with a catalytic
converter.
NOTICE
Using multiple tankfuls of leaded
gasoline can substantially reduce the
effectiveness of the catalytic converter.
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
performance using gasoline with an
alcohol component of up to 25% (E25).
Engine oil
Use only high-quality two-stroke engine
oil – ideally STIHL HP, HP Super or
HP Ultra two-stroke engine oil, as they
are specially engineered for STIHL
engines. HP Ultra ensures maximum
performance and engine life.
The engine oils are not available in all
markets.
Only STIHL two-cycle engine oil 1:50
may be used t o pro duce the fuel mixture
for machines with a catalytic converter.
Examples
Quantity of
gasoline
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)
N Pour oil into an approved safety fuel
canister first, then add gasoline and
mix thoroughly
Storing fuel mixture
Store in approved safety fuel canisters
only in a dry, cool and secure place
protected against light and sunlight.
Fuel mixture ages – mix only as much as
needed for a few weeks. Do not store
fuel mixture for longer than
three months. The fuel mixture can
become unusable faster if exposed to
light, sunlight or low or high
temperatures.
N Shake the canister containing the
fuel mixture thoroughly before
refueling
STIHL two-cycle engine
oil 1:50
Residual fuel and the liquid used for
cleaning must be disposed of in
accordance with regulations and without
harming the environment!
Mixing ratio
for STIHL two-cycle engine oil 1:50;
1:50 = 1 part oil + 50 parts gasoline
SP 90
WARNING
Pressure can build up inside the canister
– open carefully.
N The fuel tank and the canister in
which fuel mixture is stored should
be cleaned thoroughly from time to
time
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002BA420 KN
002BA418 KN
002BA419 KN
249BA053 KN
249BA054 KN
249BA055 KN
249BA056 KN
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it so that dirt
cannot fall into the tank.
N Always position the machine so that
the filler cap is facing upwards.
A number of different filler caps are
installed as standard at the factory.
Threaded filler cap
Opening the cliplock filler cap
N Swing the clip into an upright
position
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank. STIHL
recommends use of the STIHL filling
system (special accessory).
Closing the cliplock filler cap
N Position the cap with the clip in an
upright position; the markings must
line up
N Turn cap clockwise as far as it will
go (approx. 1/4 turn)
Cliplock filler cap (bayonet-type)
12
N Turn the cap counterclockwise
(approx. 1/4 turn)
N Remove the filler cap
N Fold the cliplock down so that it is
flush with the surface
If the cliplock is not flush with the surface
and the lug on the clip does not engage
entirely in the recess (arrow), the cap is
not properly closed and the steps
described above must be repeated.
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002BA447 KN
002BA448 KN
1
2
002BA319 KN
1
002BA320 KN
2
1
2
1
002BA320 KN
2
1
2
Opening screw-type tank cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
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 (special accessory).
Closing screw-type tank cap
Fitting the Harness
The type of harness is market-specific.
Shoulder strap
Attaching unit to harness
N Attach the carabiner (1) to the
carrying ring (2) on the drive tube.
Detaching unit from harness
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.
SP 90
N Put on the shoulder strap (1).
N Adjus t the len g th of t h e strap so that
the carabiner (2) is about a hand’s
width below your right hip.
N Press down the bar on the
carabiner (1) and pull the carrying
ring (2) out of the carabiner.
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2
3
1
2
414BA029 KN
414BA031 KN
5
6
4
3
STOP
2
5
6
4
7
002BA181 KN
START
STOP-
1
Backpack Carrying System
Starting / Stopping the
Engine
Controls
N Adjust the hip belt (4), the two
harness straps (5) and the support
strap (6).
The backpack carrying system
distributes the load evenly over the
shoulders, back and hips.
N Put the backpack carrying system
(1) on your back and adjust it as
described in the instruction sheet
provided.
N With the engine running, attach the
power tool to the backpack carrying
system, i.e. hook the carabiner (2)
to the ring (3) on the drive tube.
1 Throttle trigger lockout
2 Throttle trigger
3 Slide control
Positions of slide control
4STOP-0 – engine off – the ignition is
switched off
5 F – normal run position – the engine
is running or can start
6START – the ignition is switched on
– the engine can start
Symbol on slide control
7 h – stop symbol and arrow. To stop
the engine, push the slide control in
the direction of the arrow on the stop
symbol (h) to STOP-0.
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SP 90
Page 17
Starting
249BA057 KN
9
8
414BA013 KN
414BA014 KN
414BA015 KN
414BA016 KN
N Press down the trigger lockout lever
and squeeze the throttle trigger.
N Hold both levers in this position.
N Move the slide control to START
and hold it there.
N Now release the throttle trigger,
slide control and trigger lockout in
that order. This is the starting
throttle position.
N Place the powerhead on the
ground: It must rest securely on the
engine support. Rest the gearhead
on a raised support (high mound) or
position the drive tube in the fork of
a branch. Check that the rakes are
not touching the ground or any other
obstacles.
Alternative method of starting:
English
N Make sure you have a firm footing.
N When starting from the kneeling
position, hold the unit with your left
hand and press it down firmly – your
thumb should be under the fan
housing.
NOTICE
Do not stand or kneel on the drive tube
since it will otherwise be permanently
bent and damaged.
N Set the choke knob (8):
g If the engine is cold
e for warm start – also use this posi
tion if the engine has been running
-
but is still cold.
N Press the fuel pump bulb (9) at least
five times – even if the bulb is filled
with fuel.
SP 90
N Hold the unit securely with your left
hand on the fan housing – your
thumb should be under the fan
housing – rest the drive tube in the
fork of a branch – check that the
rakes and tines are not touching the
ground or any other obstacles.
N Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
Do not pull out the starter rope to full
length – 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.
15
Page 18
English
N Crank the engine until it begins to
fire. After no more than five
attempts, turn the choke knob to e.
N Continue cranking.
As soon as the engine runs:
N Blip the throttle trigger. The slide
control moves to the normal run
position F – and the engine settles
down to idle speed.
Make sure the carburetor is correctly
adjusted. The rakes must not move
when the engine is idling.
WARNING
The rakes run when the control handle is
in the starting throttle position.
Your machine is now ready for
operation.
Stopping the Engine
N Push the slide control in the
direction of the arrow on the stop
symbol (h) to STOP-0.
At very low outside temperatures:
As soon as the engine runs:
N Blip the throttle trigger to disengage
the starting throttle position. The
slide control moves to the normal
run position F – and the engine
settles down to idle speed.
N Open the throttle slightly and warm
up the engine for a brief period.
If the engine does not start
Choke knob
If you did not turn the choke knob to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
N Turn the choke knob to e
N Select the starting throttle position.
N Start the engine by pulling the
starter rope briskly – 10 to 20 pulls
may be necessary.
If the engine still does not start:
N Push the slide control in the
direction of the arrow on the stop
symbol (h) to STOP-0.
N Remove the spark plug – see
"Spark Plug".
N Dry the spark plug.
N Open the throttle wide and pull the
starter rope several times to clear
the combustion chamber.
N Refit the spark plug – see "Spark
Plug".
N Move the slide control to START.
N Set the choke knob to e – even if
the engine is cold.
N Start the engine.
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 knob according to
engine temperature.
N Now start the engine.
Operating Instructions
During break-in period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
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 enginemounted components (ignition,
carburetor) from thermal overload.
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 out-ofservice periods – see "Storing the
Machine".
16
SP 90
Page 19
English
3
1
273BA005 KN
2
4
249BA066 KN
LA
H L
249BA066 KN
LA
H L
Replacing the Air Filter
Do not remove the filter cover or replace
the air filter as long as there is no
noticeable loss of power.
If there is a noticeable loss of engine
power
N Turn the choke knob to g.
N Take out the screw (1).
N Remove the filter cover (2).
N Clean away loose dirt from around
the filter.
N Remove the filter element (3).
N Replace dirty or damaged filters.
N Replace any damaged parts.
N Fit the new air filter in the filter
housing (4).
N Fit the filter cover.
N Insert the screw and tighten it down
firmly.
Adjusting the Carburetor
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
These power tools are equipped with
different carburetors:
Version A
– High speed screw and low speed
screw with special head – without
slotted head.
On these machine versions it is no
longer necessary to adjust the
carburetor.
These machines have been set at the
factory to provide an optimum fuel-air
mixture in all locations and operating
conditions.
Adjusting Idle Speed
Engine stops while idling
N Warm up the engine for about
3 minutes.
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the cutting
attachment must not move.
Cutting attachment runs when engine is
idling
N Turn the idle speed screw (LA)
counterclockwise until the cutting
attachment stops running and then
turn the screw about another 1/2 to
3/4 turn in the same direction.
WARNING
If the working tool or cutting attachment
continues to run when the engine is
idling, have your machine checked and
repaired by your servicing dealer.
SP 90
17
Page 20
English
249BA067 KN
LA
H L
249BA067 KN
LA
H L
Version B
– High speed screw and low speed
screw with slotted head.
With this carburetor it is only possible to
adjust the high speed and low speed
screws within fine limits.
Standard Setting
N Shut off the engine.
N Mount the attachment.
N Check the air filter and clean or
replace as necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
N Check the spark arresting screen
(not in all versions) and clean or
replace as necessary.
N Carefully turn both adjusting screws
counterclockwise as far as stop:
– The high speed screw (H) is 3/4 turn
open.
– The low speed screw (L) is 3/4 turn
open.
N Start and warm up the engine.
N Adjust idle speed with the idle speed
screw (LA) so that the cutting
attachment does not move.
Adjusting Idle Speed
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
N Warm up the engine for about
3 minutes.
Engine stops while idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the cutting
attachment must not move.
Cutting attachment runs when engine is
idling
N Turn the idle speed screw (LA)
counterclockwise until the cutting
attachment stops running and then
turn the screw about another 1/2 to
3/4 turn in the same direction.
WARNING
If the working tool or cutting attachment
continues to run when the engine is
idling, have your machine checked and
repaired by your servicing dealer.
Erratic idling behavior, engine stops
even though setting of LA-screw has
been corrected, poor acceleration
Idle setting is too lean:
N Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N Turn the low speed screw (L)
clockwise, no further than stop, until
the engine runs and accelerates
smoothly.
Version B: Fine Tuning
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude, sea level or
after changing the working tool/cutting
attachment.
Rule of thumb:
Turn the high speed screw (H) about
one quarter turn for every 1000 m
(3300 ft) change in altitude.
18
SP 90
Page 21
English
249BA059 KN
1
2
3
2
249BA060 KN
Conditions for adjustment
N Carry out the standard setting
without disturbing the high speed
screw (H).
N Warm up the engine for about
3 minutes.
N Open the throttle wide.
At high altitude
N Turn the high speed screw (H)
clockwise (leaner), no further than
stop, until there is no further
noticeable increase in engine
speed.
At sea level
N Turn the high speed screw (H)
counterclockwise (richer), no further
than stop, until there is no
noticeable increase in engine
speed.
It is possible that maximum engine
speed may be reached with the standard
setting.
Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
N If the engine is down on power,
check the spark arresting screen in
the muffler.
N Wait for the muffler to cool down.
N Move the slide control to STOP-0.
N Take out the screw (1).
N Take out the screw (4).
N Lift the spark arresting screen (5)
and pull it out.
N Clean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one.
N Refit the spark arresting screen.
N Insert the screw and tighten it down
firmly.
N Fit the shroud.
SP 90
N Take out the screws (2) and remove
the shroud (3).
19
Page 22
English
1
249BA063 KN
000BA039 KN
A
1
000BA045 KN
3
002BA178 KN
2
Spark Plug
N If the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
N 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
"Specifications".
Removing the spark plug
N Move the slide control to STOP-0.
Checking the spark plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
caused fouling of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
Installing the spark plug
N Screw the spark plug (3) into the
cylinder and fit the boot (2) (press it
down firmly).
N Pull off the spark plug boot (1).
N Unscrew the spark plug.
20
WARNING
If the spark plug comes with a
detachable adapter nut (1), screw the
adapter onto the thread and tighten it
down firmly to reduce the risk of arcing
and fire.
SP 90
Page 23
Replacing the Starter Rope
1
1
414BA017 KN
2
1
4
3
5
249BA013 KN
414BA018 KN
6
249BA015 KN
and Rewind Spring
Replacing the starter rope
English
N Push the slide control in direction of
arrow a – to STOP-0.
N Take out the screws (1).
N Remove the starter cover (2) from
the housing.
SP 90
N Ease the spring clip (3) off the
starter post.
N Remove the rope rotor with
washer (4) and pawl (5).
N Remove the remaining rope from
the rotor and starter grip.
N Tie a simple overhand knot in the
new rope and then thread it through
the top of the grip and the rope
bushing (6).
N Pull the rope through the rotor and
secure it with a simple overhand
knot.
N Coat rope rotor bearing bore with
non-resinous oil.
N Slip the rotor over the starter post –
turn it back and forth to engage the
anchor loop of the rewind spring.
21
Page 24
English
4
3
5
249BA013 KN
249BA018 KN
249BA016 KN
N Refit the pawl (5) in the rotor.
N Fit the washer (4) on the starter
post.
N Use a screwdriver or suitable pliers
to fit the spring clip (3) on the starter
post and over the pawl's peg – the
spring clip must point
counterclockwise – as shown in the
illustration.
N Go to "Tensioning the Rewind
Spring".
Replacing a broken rewind spring
N Remove the rope rotor as described
in "Replacing the Starter Rope".
WARNING
The bits of spring must still be under
tension and could fly apart when you
take them out of the housing. To reduce
the risk of injury, wear face protection
and work gloves.
N Remove the spring housing and
pieces of spring.
N Lubricate the new spring with a few
drops of non-resinous oil.
N Position the new spring housing,
bottom plate facing up, against the
cutouts (arrows).
N Push the spring housing into the
starter cover.
N Reinstall the rope rotor – then go to
"Tensioning the Rewind Spring".
N If the spring pops out of the spring
housing and uncoils: refit it
counterclockwise, starting outside
and working inwards.
Tensioning the rewind spring
N Make a loop in the unwound starter
rope and use it to turn the rope rotor
six full revolutions in the direction of
the arrow.
N Hold the rotor steady. Pull out and
straighten the twisted rope.
N Let go of the rotor.
N Release the rope slowly so that it
winds onto the rotor. The starter grip
must locate firmly in the rope
bushing. If the grip droops to one
side: Add one more turn on the rope
rotor to increase spring tension.
22
SP 90
Page 25
English
414BA010 KN
N When the starter rope is fully
extended it must still be possible to
rotate the rotor another half turn. If
this is not the case, the spring is
overtensioned and could break.
Take one turn of the rope off the
rotor.
N Fit the starter cover on the housing.
N Tighten down the screws firmly.
Storing the Machine Inspection and Maintenance
by User
For periods of 3 months or longer
N Drain and clean the fuel tank in a
well ventilated area.
N Dispose of fuel properly in
accordance with local
environmental requirements.
N Run the engine until the carburetor
is dry – this helps prevent the
carburetor diaphragms sticking
together.
N Clean the rakes and tines and check
them for damage
N Thoroughly clean the machine – pay
special attention to the cylinder fins
and air filter.
N Store the machine in a dry, high or
locked location, out of the reach of
children and other unauthorized
persons.
Replacing tines
The unit comes standard with 10 tines of
which two are intended for machine
maintenance. A set of 4 tines is available
as a special accessory – for part number
see "Special Accessories".
N Broken, badly worn and missing
tines must be replaced immediately
with new tines.
SP 90
23
Page 26
English
414BA020 KN
1
16 mm
4 4
3
2
2
414BA027 KN
1
3
4
414BA028 KN
3
2
414BA022 KN
414BA023 KN
Inspections and Maintenance
by Dealer
Maintenance Work
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
Fuel Pickup Body in Tank
N Engage the combination wrench (2)
on the hexagon (3) at the base of
the tine (1).
N Use the combination wrench to
loosen the tine.
N Unscrew the tine from the rake (4).
24
N Screw the new tine (1) into the
rake (4) by hand as far as stop.
N Engage the combination wrench (2)
on the tine's hexagon (3).
N Have the pickup body in the fuel
tank replaced every year.
Antivibration Element
N Use the combination wrench (2) to
tighten down the tine firmly by
turning it another 30° to 40°.
A rubber element is installed in the fan
housing to reduce vibrations. Have it
checked if there are signs of wear or a
noticeable increase in vibration levels.
SP 90
Page 27
Valve Clearances
In difficult operating conditions, e.g.
using the machine in very dusty work
areas, the valve clearances must be
checked at shorter intervals than under
normal operating conditions and
readjusted if necessary.
Have valve clearances checked:
– After operating a new machine for 1
month
– After harvesting season or before
start of new season
English
SP 90
25
Page 28
English
Maintenance and Care
The following intervals apply to normal operating conditions only. If your daily work
ing time is longer or operating conditions are difficult (very dusty work area, etc.),
shorten the specified intervals accordingly.
Complete machine
Control handle Check operation XX
Air filter
Pickup body in fuel tank
Fuel tank Clean XX
Carburetor
Spark plug
Cooling inlets
Valve clearance
Combustion chamber
Spark arresting screen
All accessible screws and nuts (not adjust
ing screws)
Antivibration elements Check XXX
1)
1)
2)
in muffler
Visual inspection (condition, leaks) XX
Clean X
Clean XX
Replace X
Have checked by dealer
Have replaced by dealer
Check idle adjustment – the rakes must
not move
Adjusting Idle Speed X
Readjust electrode gap X
Replace after every 100 operating hours
Visual inspection X
Clean X
Check and, if necessary, have adjusted
by dealer after first 139 hours of
operation
Decoke after first 139 hours of opera
tion, then every 150 hours of operation
Check XX
Clean or replace XX
-
Retighten X
1)
1)
-
before starting work
after finishing work or daily
XX
-
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
if required
X
XXX
X
X
26
SP 90
Page 29
English
The following intervals apply to normal operating conditions only. If your daily work
ing time is longer or operating conditions are difficult (very dusty work area, etc.),
shorten the specified intervals accordingly.
Visual inspection XX
Tine
Safety labels Replace X
1)
STIHL recommends a STIHL servicing dealer.
2)
not in all versions, market-specific
Replace X
Check tightness XX
-
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
if required
SP 90
27
Page 30
English
Minimize Wear and Avoid
Damage
Observing the instructions in this manual
helps reduce the risk of unnecessary
wear and damage 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, operating and maintenance
instructions in this manual. 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 was not designed.
– Using the product for sports or
competitive events.
– Consequential damage caused by
continuing to use the product with
defective components.
Maintenance Work
All the operations described in the
"Maintenance Chart" must be performed
on a regular basis. If these maintenance
operations cannot be performed 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 authorized 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 deficient maintenance
(e.g. air and fuel filters), incorrect
carburetor adjustment or
inadequate cleaning of cooling air
inlets (intake ports, cylinder fins).
– Corrosion and other consequential
damage resulting from improper
storage.
– Damage to the machine resulting
from the use of poor quality
replacement parts.
Parts Subject to Wear and Tear
Some parts of the power tool are subject
to normal 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:
– Rakes and tines
– Drive and mounting components of
rakes and tines
– Clutch
– Filters (air, fuel)
– Rewind starter
– Spark plug
– Components of antivibration system
28
SP 90
Page 31
Main Parts
20
#
16
19
18
17
14
13
11
10
1
2
3
4
5
6
7
8
9
1
12
15
414BA032 KN
English
1 Rake
2 Tine
3 Forkhead
4 Gearbox
5 Shaft
6 Handle hose
7 Carrying ring
8 Slide control
9 Throttle trigger lockout
10 Throttle trigger
11 Choke knob
12 Spark plug boot
13 Air filter cover
14 Fuel tank
15 Machine support
16 Fuel filler cap
17 Carburetor adjusting screws
18 Fuel pump
19 Starter grip
20 Muffler (some versions with spark
arrestor)
# Serial number
SP 90
29
Page 32
English
Specifications
Engine
STIHL single cylinder four-stroke engine
with mixture lubrication
Displacement: 28.4 cm
Bore: 38 mm
Stroke: 25 mm
Engine power to
ISO 8893:
0.95 kW (1.3 HP)
at 7,000 rpm
Idle speed: 2,800 rpm
Cut-off speed
(rated): 10,500 rpm
Valve clearance:
– Inlet valve: 0.10 mm
– Exhaust valve: 0.10 mm
Ignition System
Electronic magneto ignition
Spark plug
(suppressed): Bosch USR 7AC
Electrode gap: 0.5 mm
3
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity: 0.53 l
Weight
Complete unit, dry: 6.1 kg
Overall length
Complete machine: 2310 mm
Noise and Vibration Data
Noise and vibration data are measured
at idling and maximum rated speed in a
ratio of 1:6.
For further details on compliance with
Vibration Directive 2002/44/EC see
www.stihl.com/vib.
Tool: Rakes with tines
Sound pressure level L
peq
to
EN ISO 11680-1
The K-factor in accordance with
Directive 2006/42/EC is 2.5 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/s
2
for the vibration measurement.
REACH
REACH is an EC regulation and stands
for the Registration, Evaluation,
Authorisation and Restriction of
Chemical substances.
For information on compliance with the
REACH regulation (EC) No. 1907/2006
see www.stihl.com/reach.
Gearhead
Gear ratio: 11:1
Forkhead stroke: 20 mm
Strokes per minute
at 10,000 rpm
1)
The movement of the rake in one
1)
:
1,820/min
direction is a stroke. The to and fro
movement of the rake counts as
two strokes (= 2 working strokes).
30
90 dB(A)
Sound power level L
to EN 11680-1
weq
102 dB(A)
Vibration measurement a
hv,eq
to
EN 11680-1
Handle, left 7.4 m/s
Handle, right: 6.4 m/s
2
2
SP 90
Page 33
English
414BA030 KN
1
2
Special Accessories
Backpack Carrying System
The backpack carrying system (1) – Part
No. 4182 790 4400 – distributes the load
evenly over the shoulders, back and
hips. The carabiner (2) – Part No.
4249 710 6900 – is also required for this
power tool.
– STIHL special lubricating oil (resin-
free)
– STIHL filler nozzle for STIHL fuel
canister
Contact your STIHL dealer for more
information on these and other special
accessories.
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 authorized 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
replacement parts which have been
approved by STIHL for this power tool or
are technically identical. Only use highquality 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).
Other special accessories
– Set of tines, pack of 4 – Part No.
4249 007 1003
– Safety glasses
– Shoulder strap
– Combination wrench
– Carburetor screwdriver
SP 90
31
Page 34
English
000BA025 LÄ
EC Declaration of Conformity
ANDREAS STIHL AG & Co. KG
Badstr. 115
D-71336 Waiblingen
confirms that the product described
below
Category: Special harvester
Make: STIHL
Model: SP 90
Serial identification: 4249
Displacement: 28.4 cm
conforms to the specifications of
Directives 2006/42/EC and
2004/108/EC and has been developed
and manufactured in compliance with
the following standards:.
EN ISO 12100, EN 55012,
EN 61000-6-1
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, 12.07.2010
ANDREAS STIHL AG & Co. KG
i. V.
3
Quality Certification
All STIHL products comply with the
highest quality standards.
An independent organization has
certified that all products manufactured
by STIHL meet the strict requirements of
the ISO 9001 standard for quality
management systems in terms of
product development, materials
purchasing, production, assembly,
documentation and customer service.
Elsner
Elsner Director Group Product
Management
32
SP 90
Page 35
Page 36
0458-414-0121-D
englisch
G
www.stihl.com
*04584140121D*
0458-414-0121-D
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