Stihl SP 92 User manual

SP 92
Instruction Manual2 - 23

Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Using the Unit............................................. 7
4 Assembling the Unit.................................... 8
5 Fuel........................................................... 10
6 Fueling...................................................... 11
7 Fitting the Harness....................................11
8 Backpack Carrying System.......................12
9 Starting / Stopping the Engine.................. 13
10 Operating Instructions...............................15
11 Replacing the Air Filter..............................15
12 Adjusting the Carburetor........................... 16
13 Spark Plug................................................ 16
14 Engine Running Behavior......................... 17
15 Storing the Machine.................................. 17
16 Inspection and Maintenance by User........17
17 Inspections and Maintenance by Dealer...19
18 Maintenance and Care..............................19
19 Minimize Wear and Avoid Damage...........20
20 Main Parts.................................................21
21 Specifications............................................22
22 Maintenance and Repairs......................... 22
23 Disposal.................................................... 23
24 EC Declaration of Conformity................... 23
Dear Customer,
Thank you for choosing a quality engineered
STIHL product.
It has been built using modern production techni‐
ques and comprehensive quality assurance.
Every effort has been made to ensure your satis‐
faction and trouble-free use of the product.
Please contact your dealer or our sales company
if you have any queries concerning this product.
Your
Dr. Nikolas Stihl
1 Guide to Using this Manual
1.1 Pictograms
The meanings of the pictograms attached to the
machine are explained in this manual.
Depending on the model concerned, the follow‐
ing pictograms may be attached to your
machine.
Fuel tank; fuel mixture of gasoline
and engine oil
Operate manual fuel pump
1.2 Symbols in text
WARNING
Warning where there is a risk of an accident or
personal injury or serious damage to property.
NOTICE
Caution where there is a risk of damaging the
machine or its individual components.
1.3 Engineering improvements
STIHL's philosophy is to continually improve all
of its products. For this reason we may modify
the design, engineering and appearance of our
products periodically.
Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual.
2 Safety Precautions and
Working Techniques
Special safety precautions must be
observed when working with this
power tool because the rakes and
tines move at a high stroke rate.
It is important that you read and
understand the User Manual before
commissioning and to keep it in a
safe place for future reference. Non-
compliance with the User Manual
may cause serious or even fatal
injury.
Observe all applicable local safety regulations,
e.g. by trade organizations, social insurance
institutions, labor safety authorities etc.
If you have never used a power tool before:
Have your dealer or other experienced user
show you how to operate your machine – or
attend a special course to learn how to operate
it.
Minors should never be allowed to use the
machine – except for apprentices over the age of
16 when working under supervision.
Children, animals and bystanders must not be
allowed near the machine.
English
2 0458-422-0121-D
© ANDREAS STIHL AG & Co. KG 2021
0458-422-0121-D. VA0.J21.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000008639_006_GB

When not using the machine, it must be laid
down in such a way that it does not endanger
anyone. Ensure that the machine cannot be
used without authorization.
The user is responsible for accidents or risks
involving third parties or their property.
Lend or rent your power tool only together with
this User Manual and only to persons who are
familiar with this model and its operation.
The use of noise emitting power tools may be
restricted to certain times by national or local
regulations.
Anyone operating the machine must be well res‐
ted, in good physical health and in good mental
condition.
If you have any condition that might be aggrava‐
ted by strenuous work, check with your doctor
before operating a machine.
If you have a pacemaker: The ignition system of
your machine produces an electromagnetic field
of very low intensity. This field may interfere with
some pacemakers. STIHL recommends that per‐
sons with pacemakers consult their physician
and the pacemaker manufacturer to reduce any
health risk.
Anyone who has consumed alcohol or drugs or
medicines affecting their ability to react must not
operate a power tool.
Use your power tool only for harvesting fruit
about the size of coffee berries, nuts, olives,
sloes, etc.
The power tool must not be used for any other
purpose because of the increased risk of acci‐
dents 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
explicitly approved for this power tool by STIHL
or are technically identical. If you have any ques‐
tions 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
tools and accessories. They are specifically
designed to match the product and meet your
performance requirements.
2.1 Clothing and equipment
Wear proper protective clothing and equipment.
Clothing must be sturdy but allow
complete freedom of movement.
Wear snug-fitting clothing, e.g. an
overall and jacket combination, do not
wear a work coat.
Do not wear clothing which could become trap‐
ped in wood, brush or moving parts of the
machine. Do not wear a scarf, necktie or jewelry.
Tie up and confine long hair (headscarf, cap,
hard hat, etc.).
Wear sturdy shoes with non-slip soles.
WARNING
To reduce the risk of eye injuries,
wear close-fitting safety glasses in
accordance with European Standard
EN 166. Make sure the safety
glasses are a snug fit.
Wear "personal" sound protection, e.g. ear
defenders.
Wear a safety hard hat where there is a danger
of head injuries from falling objects.
Wear sturdy protective gloves made
of a resistant material (e. g. leather).
STIHL can supply a comprehensive range of per‐
sonal protective equipment.
2.2 Transporting the machine
Always stop the engine.
002BA316 KN
Carry the machine suspended from the shoulder
strap or by the drive tube. Do not touch hot parts
of the machine, especially the muffler and gear
housing – risk of burns!
By vehicle: When transporting in a vehicle, prop‐
erly secure your machine to prevent turnover,
damage and fuel spillage.
2 Safety Precautions and Working Techniques English
0458-422-0121-D 3

2.3 Refueling
Gasoline is an extremely flammable
fuel. Keep clear of naked flames. Do
not spill any fuel – do not smoke.
Always shut off the engine before refueling.
Do not fuel a hot engine – fuel may spill and
cause a fire.
Open the fuel cap carefully to allow any pressure
build-up in the tank to release slowly and avoid
fuel spillage.
Only refuel the machine in a well ventilated
place. If fuel has been spilled, immediately clean
the machine – do not allow your clothes to be
splashed with fuel. If that happens, change your
clothes at once.
After fueling, tighten down the tank
cap as securely as possible.
This reduces the risk of unit vibrations causing
the fuel cap to loosen or come off and spill quan‐
tities of fuel.
Check for leaks. Do not start the engine if there
is a fuel leak – serious or fatal burns could result!
2.4 Before starting
Check that your power tool is properly assem‐
bled and in good condition – refer to appropriate
chapters in the instruction manual:
–Check the fuel system for leaks, especially the
visible parts, e. g., fuel cap, hose connections,
manual fuel pump (only in machines with a
manual fuel pump). In case of leakage and
damage, do not start the engine – risk of fire!
Have the machine serviced by a dealer before
using it
–The stop switch / slide control must be easy to
actuate
–Smooth action of choke knob, throttle trigger
lockout, throttle set wheel and throttle trigger –
the throttle trigger must return automatically to
the idle position. The knob must spring back
from the warm start position g to the operat‐
ing position F when the throttle trigger lockout
and throttle trigger are pressed simultaneously
–Rake and tines on the rake: All are correctly
mounted, secure and in good condition (clean,
not bent or cracked)
–Check that the spark plug boot is secure – a
loose boot may cause sparking that could
ignite combustible fumes and cause a fire!
–Do not make any changes to the controls or
the safety devices
–Keep the handles dry and clean, free from oil
and dirt, for safe control
–Adjust the harness to suit your height and
reach. Observe the chapter "Fitting the Har‐
ness"
To reduce the risk of personal injury, do not
operate your machine if it is not in a safe condi‐
tion.
To prepare for emergencies when using a har‐
ness: Practice setting down the machine quickly.
To avoid damage, do not throw the unit to the
ground when practicing.
2.5 Starting the engine
Start the engine at least 3 meters from the fuel‐
ing spot, outdoors only.
Place the machine on firm ground in an open
area. Make sure you have good balance and
secure footing. Hold the machine 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 per‐
sons within a radius of 5 meters 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 engine – start it as descri‐
bed in the User Manual.
Note that the rakes and tines continue to run for
a short period after you let go of the throttle trig‐
ger – flywheel effect!
Check idling engine: 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 combus‐
tible materials (e.g. wood chips, bark, dry grass,
fuel).
2.6 Holding and guiding the
machine
Always hold the unit firmly with both hands on
the handles. Make sure you always have good
balance and secure footing.
English 2 Safety Precautions and Working Techniques
4 0458-422-0121-D

002BA318 KN
Wrap your fingers and thumbs around the han‐
dles. Right hand on control handle, left hand on
handle hose on drive tube, even if you are left-
handed.
002BA317 KN
The machine can be carried on a harness that
bears the weight of the machine.
2.7 While working
In the event of impending danger or in an emer‐
gency, shut off the engine immediately – move
the stop switch / slide control in the direction of 0.
Ensure that there is nobody within a 5 m radius –
risk of injury due to falling objects This distance
must also be maintained in relation to objects
(vehicles, window panes) – risk of property dam‐
age!
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 regu‐
lar intervals. If the rakes and tines still run when
the engine is idling, have your dealer check your
machine and make proper adjustments or
repairs.
Exercise caution in wet conditions on slopes,
uneven ground, etc. – risk of slipping!
Clear away fallen branches and scrub.
Watch out for obstacles: tree stumps, roots – risk
of tripping or stumbling!
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 in unsteady locations
–Never work with just one hand
Greater care and attention than usual are
required when wearing ear protection, as sounds
(shouts, beeps, etc.), warning you of impending
danger, cannot be heard properly.
Take breaks when you start getting tired or feel‐
ing fatigue – risk of accidents!
Work calmly and carefully – in daylight conditions
and only when visibility is good. Proceed with
caution, do not put others in danger.
As soon as the engine is running, the
power machine generates toxic
exhaust gas. These gases may be
odorless and invisible. Never run the
engine indoors or in poorly ventilated
locations, even if your model is equip‐
ped with a catalytic converter.
To reduce the risk of fire, do not smoke while
operating or standing near your power tool. Com‐
bustible fuel vapor may escape from the fuel sys‐
tem.
If your power tool is subjected to unusually high
loads for which it was not designed (e.g. heavy
impact or a fall), always check that it is in good
condition before continuing work – see also
"Before Starting". Check in particular that the fuel
system has no leaks and the safety equipment is
fully operative. Never use a power tool that is no
longer safe to operate. In case of doubt, contact
a dealer.
Do not operate your power tool in the starting
throttle position – engine speed cannot be con‐
trolled in this position.
Before you leave the machine: Shut the engine
off.
If rakes and tines are blocked: Release the throt‐
tle trigger – switch off the engine – unblock rakes
and tines.
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 impor‐
tant components (e.g. clutch, polymer housing
components) – and this can increase the risk of
2 Safety Precautions and Working Techniques English
0458-422-0121-D 5

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 noticeable
change in the tool's behavior:
–Shut off the engine, hold the machine
securely.
–Check the condition and firm seat, watch out
for fine cracks
–Replace damaged parts immediately, even if
they have only superficial cracks.
–Shut off the engine and remove the spark plug
boot before replacing the tines or rake with
tines – risk of injury!.
Never continue using or attempt to repair dam‐
aged or cracked rakes or tines.
2.8 Vibrations
Prolonged use of the power tool may result in
vibration-induced circulation problems in the
hands (whitefinger disease).
No general recommendation can be given for the
length of usage because it depends on several
factors.
The period of usage is prolonged by:
–Hand protection (wearing warm gloves)
–Work breaks
The period of usage is shortened by:
–Any personal tendency to suffer from poor cir‐
culation (symptoms: frequently cold fingers,
tingling sensations).
–Low outside temperatures.
–The force with which the handles are held (a
tight grip restricts circulation).
Continual and regular users should monitor
closely the condition of their hands and fingers. If
any of the above symptoms appear (e.g. tingling
sensation in fingers), seek medical advice.
2.9 Maintenance and Repairs
Service the machine regularly. Do not attempt
any maintenance or repair work not described in
the instruction manual. Have all other work per‐
formed by a servicing dealer.
STIHL recommends that you have servicing and
repair work carried out exclusively by an author‐
ized STIHL servicing dealer. STIHL dealers are
regularly given the opportunity to attend training
courses and are supplied with the necessary
technical information.
Only use high-quality replacement parts in order
to avoid the risk of accidents and damage to the
machine. If you have any questions in this
respect, consult a servicing dealer.
STIHL recommends the use of 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 inter‐
vals.
Use only a spark plug of the type approved by
STIHL and make sure it is in good condition –
see "Specifications".
Inspect the ignition lead (insulation in good con‐
dition, secure connection).
Check the condition of the muffler.
To reduce the risk of fire and damage to hearing,
do not operate your machine if the muffler is
damaged or missing.
Do not touch a hot muffler since burn injury will
result.
Vibration behavior is influenced by the condition
of the AV elements – check the AV elements at
regular intervals.
English 2 Safety Precautions and Working Techniques
6 0458-422-0121-D

3 Using the Unit
1
414BA002 KN
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 above-
mentioned factors.
This unit is not recommended for harvesting des‐
sert 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 opera‐
tor being exposed to high loads caused by
increased vibration – see "Vibrations".
32
414BA003 KN
3
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).
3.1 Working Technique
Use the following working technique to obtain
best results and good performance from the har‐
vester:
► Accelerate the engine and comb the branches
with the rakes. Use the throttle trigger to
obtain the optimum rake stroke rate.
► Keep the throttle open only as long as the
rakes are engaged in the branches.
► Do not accelerate the engine when the rakes
are not engaged in the branches.
► Reposition the rakes in the next section of the
tree.
► Repeat this process for all sections of the tree.
414BA004 KN
► 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.
3 Using the Unit English
0458-422-0121-D 7

► While combing the branches, turn the rakes to
and fro around the shaft's axis (C) if neces‐
sary.
► Have the whole tree even if there is very little
fruit left on it.
► Do not hold the unit in one spot for too long so
as not to damage leaves and branches unnec‐
essarily.
► Always shut off the engine before leaving the
unit unattended.
414BA005 KN
1
NOTICE
Operating the unit with broken and/or missing
tines (1) may result in damage to gearbox com‐
ponents or overload them. Therefore, do not con‐
tinue using a unit with broken and/or missing
tines.
Operating the unit with broken and/or missing
tines reduces the unit's harvesting performance.
► Always replace damaged tines – see chapter
on "Inspection and Maintenance by User".
4 Assembling the Unit
4.1 Mounting the Gearbox
414BA006 KN
► Place the power tool on the ground so that it
rests on the machine support (arrow).
1
414BA007 KN
1
► Loosen the clamp screws (1) on the gearbox –
do not remove them.
413BA014 KN
► Pull the protective cap off the end of the drive
tube.
002BA248 KN
English 4 Assembling the Unit
8 0458-422-0121-D

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.
413BA015 KN
A
► Apply a mark (with pencil or colored pen) at
distance A (40 mm) from the end of the drive
tube.
414BA008 KN
2
3
► Push the gearbox (2) onto the drive tube (3)
as far as stop – 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 gearbox’s clamp (short arrows).
414BA009 KN
► Line up the gearbox parallel to the machine
support or the ground.
► Tighten down the clamp screws on the gear‐
box firmly.
4.2 Fitting the Tines
414BA025 KN
1
2
► Screw the tines (1) into the two rakes (2) by
hand as far as stop – fit all eight tines on the
rakes.
► Tighten down the tines by hand.
414BA026 KN
16 mm
2
4
1
3
► Engage the combination wrench (3) on the
hexagon (4) at the base of tine (1) and screw
down as far as stop.
4 Assembling the Unit English
0458-422-0121-D 9

414BA024 KN
1
3
► Use the combination wrench (3) to tighten
down the tine (1) firmly by turning it another
30° to 40°.
► Remove the combination wrench from the tine.
5 Fuel
Your engine requires a mixture of gasoline and
engine oil.
WARNING
For health reasons, avoid direct skin contact with
gasoline and avoid inhaling gasoline vapor.
5.1 STIHL MotoMix
STIHL recommends the use of STIHL MotoMix.
This ready-to-use fuel mix contains no benzol or
lead, has a high octane rating and ensures that
you always use the right mix ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for an extra long engine life.
MotoMix is not available in all markets.
5.2 Mixing Fuel
NOTICE
Unsuitable fuels or lubricants or mix ratios other
than those specified may result in serious dam‐
age to the engine. Poor quality gasoline or
engine oil may damage the engine, sealing rings,
hoses and the fuel tank.
5.2.1 Gasoline
Use only high-quality brand-name gasoline with
a minimum octane rating of 90 – leaded or unlea‐
ded.
Gasoline with an ethanol content of more than
10% can cause running problems in engines with
a manually adjustable carburetor and should not
be used in such engines.
Engines equipped with M-Tronic deliver full
power when run on gasoline with an ethanol con‐
tent of up to 25% (E25).
5.2.2 Engine Oil
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil in accordance with JASO FB, JASO
FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-
EGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
over the machine’s service life.
5.2.3 Mix Ratio
STIHL 50:1 two-stroke engine oil: 50 parts gaso‐
line to 1 part oil
5.2.4 Examples
Gasoline STIHL engine oil 50:1
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
► Use a canister approved for storing fuel. Pour
oil into canister first, then add gasoline and
mix thoroughly.
5.3 Storing Fuel
Store fuel only in approved safety-type fuel can‐
isters in a dry, cool and safe location protected
from light and the sun.
Fuel mix ages – only mix sufficient fuel for a few
weeks work. Do not store fuel mix for longer than
30 days. Exposure to light, the sun, low or high
temperatures can quickly make the fuel mix
unusable.
STIHL MotoMix may be stored for up to 2 years
without any problems.
► Thoroughly shake the mixture in the canister
before fueling your machine.
WARNING
Pressure may build up in the canister – open it
carefully.
► Clean the fuel tank and canister from time to
time.
English 5 Fuel
10 0458-422-0121-D

Dispose of remaining fuel and cleaning fluid
properly in accordance with local regulations and
environmental requirements.
6 Fueling
6.1 Fuel filler cap
0208BA019 KN
WARNING
When fueling on a slope, always position the
machine with the filler cap facing uphill.
► Place the machine on level ground so that the
filler cap is facing up.
► Before fueling, clean the filler cap and the area
around it to ensure that no dirt falls into the
tank.
6.2 Open the tank cap.
0208BA020 KN
► Turn the cap counterclockwise until it can be
removed from the tank opening.
► Remove the cap.
6.3 Filling up with fuel
Take care not to spill fuel while fueling and do
not overfill the tank.
STIHL recommends you use the STIHL filler noz‐
zle for fuel (special accessory).
► Fill up with fuel.
6.4 Close the tank cap.
0208BA021 KN
► Place the cap in the opening.
► Turn the cap clockwise as far as stop and
tighten it down as firmly as possible by hand.
7 Fitting the Harness
The type of harness is market-specific.
7.1 Shoulder strap
1
2
002BA319 KN
► Put on the shoulder strap (1).
► Adjust the length of the strap so that the cara‐
biner (2) is about a hand’s width below your
right hip.
6 Fueling English
0458-422-0121-D 11

7.2 Attaching unit to harness
1
002BA320 KN
2
1
2
► Attach the carabiner (1) to the carrying ring (2)
on the drive tube.
7.3 Detaching unit from harness
1
002BA320 KN
2
1
2
► Press down the bar on the carabiner (1) and
pull the carrying ring (2) out of the carabiner.
8 Backpack Carrying System
2
3
1
2
414BA029 KN
The backpack carrying system distributes the
load evenly over the shoulders, back and hips.
► Put the backpack carrying system (1) on your
back and adjust it as described in the instruc‐
tion sheet provided.
► 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.
414BA031 KN
5
6
4
► Adjust the hip belt (4), the two harness straps
(5) and the support strap (6).
English 8 Backpack Carrying System
12 0458-422-0121-D

9 Starting / Stopping the
Engine
9.1 Controls
0208BA028 KN
2
1
43
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch with Run and Stop positions.
Depress the stop switch (…) to switch off the
ignition – see "Function of Stop Switch and
Ignition System".
4 Throttle set wheel – limits travel of throttle
trigger – see "Function of Throttle Set Wheel".
9.1.1 Function of Stop Switch and Ignition
System
The stop switch is normally in the Run position,
i.e. when it is not depressed: The ignition is
switched on – the engine is ready to start. Oper‐
ate the stop switch to switch off the ignition. The
ignition is switched on again automatically after
the engine stops.
9.1.2 Function of Throttle Set Wheel
Travel of throttle trigger can be limited with the
set wheel:
–Turn throttle set wheel in direction of – as far
as stop to limit travel to idle speed.
–Turn throttle set wheel in direction of + as far
as stop to allow travel to full throttle.
–The preset limit can be temporarily overridden
by squeezing the throttle trigger firmly.
9.2 Starting the Engine
5
0000-GXX-5224-A0
► Press the manual fuel pump bulb (5) at least
five times – even if the bulb is already filled
with fuel.
Cold engine (cold start)
2.
1.
6
0000-GXX-5475-A0
►Turn choke knob (6) and then push it in at g
Also use this setting if the engine has been run‐
ning but is still cold.
–Turn throttle set wheel in direction of + as far
as stop.
Hot engine (hot start)
►Choke knob (6) remains in F position.
9.2.1 Cranking
414BA013 KN
9 Starting / Stopping the Engine English
0458-422-0121-D 13

► Place the powerhead on the ground: It must
rest securely on the engine support. Rest the
gearbox 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:
414BA014 KN
► 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.
414BA015 KN
► Make sure you have a firm footing.
► 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 dam‐
aged.
414BA016 KN
► Hold the starter grip in your right hand and pull
it out slowly and steadily.
NOTICE
Do not pull out the starter rope all the way – it
might otherwise break.
► Do not let the starter grip snap back. Guide it
slowly back into the housing so that the starter
rope can rewind properly.
► Continue cranking until the engine runs.
9.2.2 As soon as the engine runs
At temperatures below +10°C
Warm up the engine for at least 10 seconds in
position g.
At temperatures above +10°C
Warm up the engine for at least 5 seconds in
position g.
English 9 Starting / Stopping the Engine
14 0458-422-0121-D

0208BA033 KN
► Depress throttle trigger lockout and pull the
throttle trigger – the choke knob moves to the
run position F.
Warm up a cold engineat varying speeds.
WARNING
Make sure the carburetor is correctly adjusted.
The working tool must not move when the engine
is idling.
Your machine is now ready for operation.
9.3 Stopping the Engine
► Depress the momentary contact stop switch –
the engine stops – release the stop switch – it
springs back to the run position.
9.4 Other Hints on Starting
Engine stalls in cold start position g.
► Depress throttle trigger lockout and pull the
throttle trigger – the choke knob moves to the
run position F.
►Continue cranking in position F until the engine
runs.
Running engine stalls in cold start position g or
under acceleration.
►Continue cranking in cold start position g
until the engine runs.
If the engine does not start
► Check that all settings are correct.
► Check that there is fuel in the tank and refuel if
necessary.
► Check that the spark plug boot is properly con‐
nected.
► Repeat the starting procedure.
Fuel tank run until completely dry
► After refueling, depress the manual fuel pump
bulb at least 5 times – even if the bulb is
already filled with fuel.
► Set the choke knob according to engine tem‐
perature.
► Now start the engine.
10 Operating Instructions
10.1 During break-in period
A factory-new machine should not be run at high
revs (full throttle off load) for the first three tank
fillings. This avoids unnecessary high loads dur‐
ing the break-in period. As all moving parts have
to bed in during the break-in period, the frictional
resistances in the engine are greater during this
period. The engine develops its maximum power
after about 5 to 15 tank fillings.
10.2 During Operation
After a long period of full throttle operation, allow
the engine to run for a short while at idle speed
so that engine heat can be dissipated by the flow
of cooling air. This protects engine-mounted
components (ignition, carburetor) from thermal
overload.
10.3 After Finishing Work
Storing for a short period: Wait for the engine to
cool down. Empty the fuel tank and keep the
machine in a dry place, well away from sources
of ignition, until you need it again. For longer out-
of-service periods – see "Storing the Machine".
11 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.
10 Operating Instructions English
0458-422-0121-D 15

11.1 If there is a noticeable loss of
engine power
1
1
2
34
6162BA007 AM
►Turn the choke knob to g.
► Take out the screws (1).
► Remove the filter cover (2).
► Clean away loose dirt from around the filter.
► Remove the filter element (3).
► Replace dirty or damaged filters.
► Replace any damaged parts.
► Fit the new air filter in the filter housing (4).
► Fit the filter cover.
► Fit the screws and tighten them down firmly.
12 Adjusting the Carburetor
0208BA036 KN
The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
12.1 Adjusting Idle Speed
Engine stops while idling
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly.
Attachment runs when engine is idling
► Turn the idle speed screw (LA) slowly counter‐
clockwise until the attachment stops running.
13 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
13.1 Removing the spark plug
1
0208BA037 KN
2
► Turn screw (1) in cap (2) until cap can be
removed
► Lay down cap
3
0208BA038 KN
► Pull off the spark plug boot (3)
► Unscrew spark plug,
13.2 Checking the Spark Plug
000BA039 KN
A
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
–Too much oil in fuel mix.
–Dirty air filter.
English 12 Adjusting the Carburetor
16 0458-422-0121-D

–Unfavorable running conditions.
1
000BA045 KN
WARNING
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
13.3 Installing the Spark Plug
► Fit the spark plug and tighten it down firmly.
► Press the boot firmly onto the spark plug.
1
2
0208BA039 KN
► Fit the cap (1), insert the screw (2) and tighten
it down firmly.
14 Engine Running Behavior
If engine running behavior is still unsatisfactory
after the air filter has been serviced and the car‐
buretor and throttle cable have been adjusted
correctly, the cause may also be in the muffler.
Have the muffler checked for contamination (cok‐
ing) by a servicing dealer!
STIHL recommends that maintenance and repair
work be carried out only by authorized STIHL
dealers.
15 Storing the Machine
For periods of 3 months or longer
► Drain and clean the fuel tank in a well ventila‐
ted area.
► Dispose of fuel properly in accordance with
local environmental requirements.
► Run the engine until the carburetor is dry – this
helps prevent the carburetor diaphragms stick‐
ing together.
► Clean the rakes and tines and check them for
damage
► Thoroughly clean the machine – pay special
attention to the cylinder fins and air filter.
► Store the machine in a dry, high or locked
location, out of the reach of children and other
unauthorized persons.
16 Inspection and Mainte‐
nance by User
16.1 Adjusting the Throttle Cable
The throttle cable can be adjusted only when the
machine is properly assembled. The control han‐
dle must be in the normal operating position.
If the following adjustments do not produce the
required result, have your servicing dealer repair
the machine. STIHL recommends an authorized
STIHL servicing dealer.
16.1.1 Checking Adjustment of Throttle Cable
Error: Engine speed increases when only the
throttle trigger is pulled.
2
0208BA042 KN
1
► Start the engine.
► Pull the throttle trigger (1) – do not press down
the throttle trigger lockout (2).
If the engine speed increases or if the attach‐
ment runs, the throttle cable has to be adjusted.
► Shut down the engine.
14 Engine Running Behavior English
0458-422-0121-D 17

16.1.2 Adjusting the Throttle Cable
0208BA043 KN
► Depress the throttle trigger lockout (1) and the
throttle trigger (2) as far as stop and hold them
in that position.
Apply only sufficient pressure to hold the levers
against their stops.
► Rotate screw in throttle trigger 1/2 turn coun‐
terclockwise.
► Release the throttle trigger and throttle trigger
lockout.
► Start the engine and check the adjustment.
► Shut down the engine and repeat adjustment if
necessary.
16.1.3 Replacing Tines
414BA010 KN
A set of 4 tines is available as a special acces‐
sory – see "Special Accessories” for part num‐
ber.
► Broken, badly worn and missing tines must be
replaced immediately with new tines.
414BA020 KN
1
16 mm
4 4
3
2
2
► Engage the combination wrench (2) on the
hexagon (3) at the base of the tine (1).
► Use the combination wrench to loosen the
tine.
► Unscrew the tine from the rake (4).
414BA027 KN
1
3
4
► Screw the tine (1) into the rake (4) as far as
possible by hand.
English 16 Inspection and Maintenance by User
18 0458-422-0121-D

► Engage the combination wrench (2) on the
hexagon (3) at the base of the tine (1) and
screw down as far as stop.
414BA028 KN
3
2
► Use the combination wrench (2) to tighten
down the tine firmly by turning it another 30° to
40°.
17 Inspections and Mainte‐
nance by Dealer
17.1 Maintenance work
STIHL recommends that all maintenance and
repairs be carried out by STIHL dealers.
17.2 Fuel pickup body in tank
0208BA044 KN
► Check the pickup bodies in the fuel tank annu‐
ally and have them replaced when necessary
The pickup bodies should be located in the tank
in the areas shown in the figure.
17.3 Antivibration element
0208BA045 KN
A vibration-absorbing rubber element is installed
between the powerhead and the shaft. Have it
checked in the event of noticeable wear or con‐
stantly increased vibration.
18 Maintenance and Care
The following intervals apply to normal operating
conditions only. If your daily working time is longer
or operating conditions are difficult (very dusty work
area, etc.), shorten the specified intervals accord‐
ingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
as required
Complete machine Visual inspection (condi‐
tion, leaks)
X X
Clean X
Replace any damaged
parts
X
17 Inspections and Maintenance by Dealer English
0458-422-0121-D 19

The following intervals apply to normal operating
conditions only. If your daily working time is longer
or operating conditions are difficult (very dusty work
area, etc.), shorten the specified intervals accord‐
ingly.
before starting work
after finishing work or daily
after each refueling stop
weekly
monthly
every 12 months
if problem
if damaged
as required
Control handle Check operation X X
Air filter Visual inspection X X
Replace1) X
Fuel tank Clean XXX
Manual fuel pump (if fit‐
ted)
Check X
Have repaired by servic‐
ing dealer2)
X
Pickup body (filter) in fuel
tank Check2) X
Replace2) X X X
Carburetor Check idle adjustment –
the attachment must not
run
X X
Readjust idle speed X
Spark plug Readjust electrode gap X
Replace after every 100
operating hours
Cooling air inlet Visual inspection X
Clean X
Cylinder fins Clean 2) X
All accessible screws and
nuts (not adjusting
screws)
Re-tighten X
Antivibration elements Visual inspection3) X X X
Replace2) X
Tines Visual inspection X X
Replace X
Check tightness X X
Safety labels Replace X
1)Only if there is a noticeable loss of engine power
2)STIHL recommends an authorized STIHL servicing dealer.
3)see chapter "Inspections and Maintenance by Dealer", section "Antivibration Elements"
19 Minimize Wear and Avoid
Damage
Observing the instructions in this manual helps
reduce the risk of unnecessary wear and dam‐
age to the power tool.
The power tool must be operated, maintained
and stored with the due care and attention
described in this owner's manual.
The user is responsible for all damage caused by
non-observance of the safety precautions, oper‐
ating and maintenance instructions in this man‐
ual. This includes in particular:
English 19 Minimize Wear and Avoid Damage
20 0458-422-0121-D