Stihl HL 94 User manual

HL 94
2 - 26 Instruction Manual

Contents
1 Guide to Using this Manual.........................2
2 Safety Precautions and Working Techni‐
ques............................................................ 2
3 Using the Unit............................................. 7
4 Approved Power Tool Attachments.......... 10
5 Assembling the Unit.................................. 10
6 Fuel........................................................... 11
7 Fueling...................................................... 12
8 Adjusting the Cutter Bar............................13
9 Fitting the Harness....................................14
10 Starting / Stopping the Engine.................. 15
11 Operating Instructions...............................17
12 Cleaning the Air Filter............................... 18
13 Engine Management.................................18
14 Adjusting the Carburetor........................... 18
15 Spark Plug................................................ 18
16 Lubricating the Gearbox............................19
17 Sharpening Instructions............................ 20
18 Storing the Machine.................................. 21
19 Inspection and Maintenance by User........21
20 Inspections and Maintenance by Dealer...21
21 Maintenance and Care..............................22
22 Main Parts.................................................24
23 Specifications............................................24
24 Maintenance and Repairs......................... 25
25 Disposal.................................................... 25
26 EC Declaration of Conformity................... 26
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
Filler hole for gear lubricant
1.2 Symbols in text
WARNING
Warning where there is a risk of an accident or
personal injury or serious damage to property.
NOTICE
Caution where there is a risk of damaging the
machine or its individual components.
1.3 Engineering improvements
STIHL's philosophy is to continually improve all
of its products. For this reason we may modify
the design, engineering and appearance of our
products periodically.
Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual.
2 Safety Precautions and
Working Techniques
Because a long-reach hedge trimmer
is a high-speed, fast-cutting power
tool with very sharp cutting blades
and a long reach, special safety pre‐
cautions must be observed during
operation.
It is important that you read and
understand the User Manual before
commissioning and keep it in a safe
place for future reference. Non-com‐
pliance with the User Manual may
cause serious or even fatal injury.
Observe all applicable local safety regulations,
e.g. by trade organizations, social insurance
institutions, labor safety authorities etc.
If you have never used a power tool before:
Have your dealer or other experienced user
show you how to operate your machine – or
attend a special course to learn how to operate
it.
Minors are not allowed to work with the power
tool – except adolescents above 16 years of age
who are instructed under supervision.
Children, animals and onlookers must not be
allowed near the machine.
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.
English
2 0458-519-8321-D
© ANDREAS STIHL AG & Co. KG 2022
0458-519-8321-D. VA0.E22.
Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.
Original Instruction Manual 0000008168_008_GB

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 machines that emit noise may be limi‐
ted to certain hours of the day as specified by
national and/or regional or local regulations.
Anyone operating the machine must be well res‐
ted, in good physical health and in good mental
condition.
If you have any condition that might be aggrava‐
ted by strenuous work, check with your doctor
before operating a machine.
If you have a pacemaker: The ignition system of
your machine produces an electromagnetic field
of very low intensity. This field may interfere with
some pacemakers. STIHL recommends that per‐
sons with pacemakers consult their physician
and the pacemaker manufacturer to reduce any
health risk.
Anyone who has consumed alcohol or drugs or
medicines affecting their ability to react must not
operate a power tool.
Use the machine only for cutting hedges, shrubs,
bushes, scrub and the like.
Other uses are not permitted and may lead to
accidents or 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 use cutting blades 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 your 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 genuine STIHL
tools and accessories. They are specifically
designed to match the product and meet your
performance requirements.
Never attempt to modify your power tool in any
way since this may increase the risk of personal
injury. STIHL excludes all liability for personal
injury and damage to property caused while
using unauthorized attachments.
Do not use a high-pressure washer to clean the
power tool. The solid jet of water may damage
parts of the unit.
Do not spray the machine with water.
2.1 Clothing and equipment
Wear proper protective clothing and equipment.
Clothing must be robust but allow
complete freedom of movement.
Wear close-fitting clothes such as a
boiler suit, not a loose jacket.
Do not wear clothing which could
become trapped in wood, brush or
moving parts of the machine. Do not
wear a scarf, necktie or jewelry. Tie
up and confine long hair above your
shoulders.
Wear safety boots with steel toe caps
and non-slip soles.
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.
Always fit the scabbard over the blades before
transporting the machine even for short distan‐
ces.
For machines with a defined transport position:
Move the cutter bar into transport position and
have it engaged.
Carry the power tool properly balanced by the
shaft – cutting blades behind you.
Avoid touching hot parts of the machine 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
0458-519-8321-D 3

2.3 Refueling
Gasoline is highly flammable – keep
away from fire or flame – do not spill
any fuel – no smoking.
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 refueling, close the fuel cap as
tightly as possible.
This helps reduce the risk of unit vibrations caus‐
ing an incorrectly tightened fuel cap to loosen or
come off and spill quantities of fuel.
Check for leaks. Do not start the engine if there
is a fuel leak – serious or fatal burns could result!
2.4 Before starting
Check that your power tool is properly assem‐
bled and in good condition – refer to appropriate
chapters in the User Manual:
–Check the fuel system for leaks, especially the
visible parts, e. g., fuel cap, hose connections,
manual fuel pump (only in machines with a
manual fuel pump). In case of leakage and
damage, do not start the engine – risk of fire!
Have the machine serviced by a dealer before
using it
–The stop switch must be easy to push
–Check the rotary knob for warm start, throttle
trigger lockout, throttle trigger and set wheel
for smooth action – the throttle trigger must
return automatically to idle position. From the
warm start knob position g, it must return to
the run position F when the throttle trigger
lockout and throttle trigger are pressed simul‐
taneously
–Check that the spark plug boot is secure – a
loose boot may cause sparking that could
ignite combustible fumes and cause a fire!
–Cutting blades must be properly tightened and
in safe operating condition (clean, sharp, not
bent or warped), correctly mounted and thor‐
oughly sprayed with STIHL resin solvent (lubri‐
cant)
–For machines with adjustable cutter bar: The
adjustment mechanism must be snapped into
the start position
–For machines with a defined transport position
(cutter bar folded against the shaft): Never
start the machine in the transport position
–Never attempt to modify the controls or safety
devices.
–Keep the handles dry and clean – free from oil
and dirt – this is important for safe control of
the machine
–Adjust carrying harness and handles in
accordance with body height. Observe the
chapter "Fitting the Harness"
To reduce the risk of personal injury, do not
operate your power tool if it is damaged or not
properly assembled!
To prepare for emergencies when using a har‐
ness: Practice setting down the machine quickly.
To avoid damage, do not throw the machine 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 power tool on firm ground in an open
area. Make sure you have good balance and
secure footing. Hold the power tool securely. The
cutting blades must be clear of the ground and
all other obstructions because they may begin to
run when the engine starts.
Your power tool is designed to be operated by
one person only. Do not allow other persons in
the work area – even when starting.
Avoid contact with the cutting blades – risk of
injury!
Do not drop-start the engine – start it as descri‐
bed in the User Manual. Note that the cutting
blades continue to run for a short period after
you let go of the throttle trigger (flywheel effect).
Check engine idling: The cutting blades must
remain at a standstill when the engine idles –
throttle trigger released.
Keep easily combustible materials (e.g., wood
chips, bark, dry grass, fuel) away from hot
exhaust gases and the hot muffler surface – risk
of fire!
English 2 Safety Precautions and Working Techniques
4 0458-519-8321-D

2.6 Holding and guiding the
machine
Always hold the unit firmly with both hands on
the handles.
Make sure you always have a secure footing and
hold the machine so that the cutting blades are
always facing away from your body.
Some versions of the machine can be carried on
a harness to relieve the weight on the operator's
arms.
2.6.1 Models with Loop Handle
0000-GXX-1677-A0
Keep your right hand on the control handle and
your left hand on the loop handle on the shaft –
this applies to left-handed people as well. Wrap
your fingers and thumbs around the handles.
2.6.2 Machines with handle hose
0000-GXX-1678-A0
Right hand on control handle, left hand on han‐
dle hose on drive tube, even if you are left-
handed. Wrap your fingers and thumbs around
the handles.
2.7 While working
In the event of impending danger or in an emer‐
gency, switch off the engine immediately – push
the stop switch.
This power tool is not insulated. Keep
away from power cables – danger of
electrocution!
5m (17ft)
To reduce the risk of injury from mov‐
ing blades or falling cuttings, do not
allow bystanders within 5 meters of
your own position.
This distance must also be maintained in relation
to objects (vehicles, window panes) – risk of
property damage!
Watch the cutting blades at all times – do not cut
areas of the hedge that you cannot see.
Be extremely careful when cutting tall hedges;
check the other side of the hedge before starting
work.
Check for correct idling, so that the cutting
blades stop moving when the throttle trigger is
released. Check and correct the idle speed set‐
ting at regular intervals. If the cutting blades still
run, have your dealer check your machine and
make proper adjustments or repairs.
Note that the cutting blades continue to run for a
short period after you let go of the throttle trigger
- flywheel effect!
Take special care in slippery conditions – damp,
snow, ice, on slopes or uneven ground.
Clear away fallen branches, scrub and cuttings.
Watch out for obstacles: tree stumps, roots – risk
of tripping or stumbling!
Make sure you always have a firm and secure
footing.
2.7.1 When working at heights:
–Always use a lift bucket
–Never use the machine while standing on a
ladder or in a tree
–never work on an unstable surface
–Never use the machine with just one hand
Be particularly alert and cautious when wearing
hearing protection because your ability to hear
warnings (shouts, alarms, etc.) is restricted.
Take breaks when you start getting tired or feel‐
ing fatigue – risk of accidents!
Work calmly and carefully – in daylight conditions
and only when visibility is good. Proceed with
caution, do not put others in danger.
Your power tool produces toxic
exhaust fumes as soon as the engine
starts running. These gases may be
odorless and invisible and may con‐
tain unburned hydrocarbons and ben‐
zene. Never run the engine indoors or
in poorly ventilated locations, even if
your model is equipped with a cata‐
lytic converter.
2 Safety Precautions and Working Techniques English
0458-519-8321-D 5

To reduce the risk of serious or fatal injury from
breathing toxic fumes, ensure proper ventilation
when working in trenches, hollows or other con‐
fined locations.
Stop work immediately if you start suffering from
nausea, headaches, impaired vision (e.g. your
field of vision gets smaller), impaired hearing,
dizziness, or impaired concentration – these
symptoms may possibly be the result of too-high
exhaust gas concentration – Risk of accidents!
Operate your power tool so that it produces a
minimum of noise and emissions – do not run the
engine unnecessarily, accelerate the engine only
when working.
To reduce the risk of fire, do not smoke while
operating or standing near your power tool. Com‐
bustible fuel vapor may escape from the fuel sys‐
tem.
Dusts, mist and fumes emissions during the work
may be hazardous to your health. Wear respira‐
tory protection in case of heavy dust or smoke
emission.
The gear head becomes hot during
operation. To reduce the risk of burn
injury, do not touch the gear housing!
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.
Inspect the hedge and work area to avoid dam‐
aging the cutting blades:
–Remove stones, rocks, pieces of metal and
other solid objects
–When working close to the ground, make sure
that no sand, grit or stones get between the
cutting blades
–Take particular care when cutting hedges next
to or against wire fences
Do not touch electric power lines – never cut
through electric power lines – risk of electrocu‐
tion!
Do not touch the cutting blades.while
the engine is running. If the cutting
blades become jammed by an object,
switch off the engine immediately
before attempting to remove the
object – risk of injury!
Opening the throttle when the cutting blades are
jammed increases the load and reduces the
working speed of the engine. The constant slip‐
ping of the clutch causes overheating and dam‐
age to important components (e.g. coupling,
plastic housing parts) – thus e.g. due to the cut‐
ting blade moving during idling – risk of injury!
If the hedge is very dusty or dirty, spray the cut‐
ting blades with STIHL resin solvent from time to
time during cutting. This helps reduce blade fric‐
tion as well as the aggressive effects of sap and
the build-up of dirt particles.
Before you leave the machine: Shut the engine
off.
Check the cutting blades at regular, frequent
intervals during operation or immediately if there
is a noticeable change in cutting behavior:
–Shut off the engine
–Wait for cutting blades to come to a standstill
–Check condition and tightness of connections,
look out for fine cracks
–Ensure that the cutting blades are sharp
Always clean plant residue, chips, leaves and
excess lubricant off the engine and muffler – risk
of fire!
2.8 After finishing work
Always clean dust and dirt off the machine – do
not use any grease solvents for this purpose.
Spray the cutting blades with STIHL resin sol‐
vent. Run the motor briefly so that the solvent is
evenly distributed.
2.9 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:
English 2 Safety Precautions and Working Techniques
6 0458-519-8321-D

–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.
2.10 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
power tool. If you have any questions in this
respect, consult a servicing dealer.
STIHL recommends the use of original STIHL
replacement parts. They are specifically
designed to match your model and meet your
performance requirements.
To reduce the risk of injury, 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 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.
3 Using the Unit
3.1 Cutting Season
Observe country-specific or municipal rules and
regulations for cutting hedges.
Do not use your hedge trimmer during rest peri‐
ods customary in the neighborhood.
3.2 Cutting Sequence
If a radical cut is necessary, cut a little at a time
in several stages.
Use lopping shears to cut out thick branches
first.
Cut the sides of the hedge first, then the top.
3.3 Disposal
Do not throw cuttings into the garbage can – they
can be composted.
3.4 Preparations
► Model with adjustable cutter bar: Set the cutter
bar to the straight (0°) position.
► Remove the blade scabbard.
► Start the engine.
► If you use a harness: Put on the harness and
attach it to the machine.
3 Using the Unit English
0458-519-8321-D 7

3.5 Working Techniques
3.5.1 Horizontal Cut (with cutter bar at an
angle)
388BA029 KN
Cutting close to the ground from a standing posi‐
tion, e.g. low shrubs.
Swing the cutter bar up and down as you move
along the hedge – use both sides of the cutting
blades, do not rest the cutter bar on the ground.
WARNING
The K version (HL 92 K) is not approved for cut‐
ting close to the ground.
3.5.2 Vertical Cut (with cutter bar at an
angle)
388BA030 KN
Cutting without standing directly next to the
hedge, e.g. flowerbed between operator and
hedge.
Swing the cutter bar up and down in an arc as
you move along the hedge – use both sides of
the cutting blades.
English 3 Using the Unit
8 0458-519-8321-D

3.5.3 Vertical Cut (with straight cutter bar)
389BA050 KN
Extra long reach without the need for other aids.
Swing the cutter bar up and down in an arc as
you move along the hedge – use both sides of
the cutting blades.
3.5.4 Overhead Cut (with cutter bar at an
angle)
388BA031 KN
Hold the hedge trimmer vertically and swing it in
an arc to make maximum use of its reach.
WARNING
Any working position above head height is tiring.
To minimize the risk of accidents, work in such
positions for short periods only. Set the adjusta‐
ble cutter bar to the most suitable angle so that
the unit can be held in a lower, less tiring position
while still providing adequate reach.
3.5.5 Horizontal Cut (with straight cutter bar)
388BA032 KN
Hold the cutter bar at an angle of 0° to 10° as
you swing the hedge trimmer horizontally.
3 Using the Unit English
0458-519-8321-D 9

388BA033 KN
Swing the cutter bar in an arc towards the out‐
side of the hedge so that the cuttings are swept
to the ground.
Recommendation: Only cut hedges that are no
more than chest height.
4 Approved Power Tool
Attachments
The following STIHL attachments may be moun‐
ted to the basic power tool:
Attachment Application
HL 0°, 500 mm 1) Long reach hedge trim‐
mer
HL 0°, 600 mm 1) Long reach hedge trim‐
mer
HL 145°, 500 mm 1) Long reach hedge trim‐
mer
HL 145°, 600 mm 1) Long reach hedge trim‐
mer
HT 2) Pole pruner
BF 2) 3) Cultivator with pick tines
SP 10 Special harvester
5 Assembling the Unit
5.1 Mounting the Loop Handle
(HL 92, HL 94)
Loop handle is required on versions with long
drive tube (HL 92, HL 94).
7
8
2
1
6
7
8
9
9
3
5
4
0000-GXX-1679-A0
► Place the clamp (1) in the loop handle (2) and
position them both against the drive tube (5)
between the carrying ring (3) and handle
hose (4).
► Position the clamp (6) against the shaft.
► Line up the holes.
► Insert the screws (7) with washers (8).
► Fit the square nuts (9) and screws.
1) Loop handle required on versions with long drive tube (HL 92, HL 94)
2) Not approved for versions with short drive tube (HL 92 K)
3) Loop handle required
English 4 Approved Power Tool Attachments
10 0458-519-8321-D

2
A
0000-GXX-1680-A0
► Align the loop handle (2) and move it to the
most comfortable position (recommended:
about 20 cm).
► Tighten down the screws firmly.
5.2 Mounting the Gearbox
11
10
10
5
0000-GXX-1681-A0
► Loosen the clamp screws (10).
► Push the gearbox (11) onto the drive tube (5),
turn the gearbox (11) back and forth as neces‐
sary.
11
12
0000-GXX-1682-A0
Once the end of the drive tube is inserted
beyond the slot in the clamp (12):
► Push the gearbox (11) fully home as far as
stop.
► Tighten down the clamp screws moderately.
► Line up the gearbox (11) with the powerhead.
► Tighten down the clamp screws firmly.
6 Fuel
The engine requires a mixture of gasoline and
engine oil.
WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
6.1 STIHL MotoMix
STIHL recommends using STIHL MotoMix. This
pre-blended fuel is free of benzene and lead, is
distinguished by a high octane rating, and
always provides the proper mixing ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for optimum engine life.
MotoMix is not available in all markets.
6 Fuel English
0458-519-8321-D 11

6.2 Mixing fuel
NOTICE
Unsuitable fuels or a mixing ratio that deviates
from the specification can lead to severe engine
damage. The engine, seals, fuel lines and fuel
tank may be damaged if low-quality gasoline or
engine oil is used.
6.2.1 Gasoline
Use only high-quality gasoline with an octane rat‐
ing of at least 90 ROC – leaded or unleaded.
Gasoline with an alcohol component exceeding
10% can cause impaired engine performance in
engines with manually adjustable carburetors
and thus should not be used in these engines.
Engines with M-Tronic deliver full engine per‐
formance using gasoline with an alcohol compo‐
nent of up to 27% (E27).
6.2.2 Engine oil
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil classified as 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.
6.2.3 Mixing ratio
with STIHL two-stroke engine oil 1:50; 1:50 =
1 part oil + 50 parts gasoline
6.2.4 Examples
Quantity of gaso‐
line
STIHL two-stroke
engine oil 1:50
Liters Liters (ml)
1 0.02 (20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
► Pour oil into an approved safety fuel canister
first, then add gasoline and mix thoroughly
6.3 Storing fuel mixture
Store in approved safety fuel canisters only in a
dry, cool and secure place protected against light
and sunlight.
Fuel mixture deteriorates with age – mix only as
much as needed for a few weeks. Do not store
fuel mixture for longer than 30 days. The fuel
mixture can become unusable more quickly if
exposed to light, sunlight or low or high tempera‐
tures.
STIHL MotoMix however can be stored for up to
5 years without any problems.
► Shake the canister containing the fuel mixture
thoroughly before refueling
WARNING
Pressure may have built up in the canister –
open it carefully.
► The fuel tank and the canister in which fuel
mixture is stored should be cleaned thoroughly
from time to time
Residual fuel and the liquid used for cleaning
must be disposed of in accordance with regula‐
tions and without harming the environment!
7 Fueling
7.1 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.
English 7 Fueling
12 0458-519-8321-D

7.2 Open the tank cap.
0208BA020 KN
► Turn the cap counterclockwise until it can be
removed from the tank opening.
► Remove the cap.
7.3 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.
7.4 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.
8 Adjusting the Cutter Bar
8.1 Angle Adjuster - 145°
0000-GXX-1683-A0
145°
The angle of th cutter bar can be adjusted
upwards in 4 stages from 0° (straight) to 55°, and
downwards in 7 stages from 0° to 90° (right
angle facing down). There are therefore 12 pos‐
sible working positions.
WARNING
To reduce the risk of injury, carry out the adjust‐
ment only when the cutting blades are at a
standstill – engine at idle speed.
WARNING
The gearbox gets hot during operation. To
reduce the risk of burn injury, do not touch the
gearbox.
WARNING
To reduce the risk of injury, never touch the
blades while making adjustments.
8 Adjusting the Cutter Bar English
0458-519-8321-D 13

0000-GXX-1684-A0
3
2
1
► Pull back the sliding sleeve (1) and use the
lever (2) to adjust the joint by one or several
holes.
► Release the sliding sleeve (1) and make sure
the lock pin engages the quadrant (3).
8.2 Transport Position
0000-GXX-1685-A0
The cutter bar can be folded flat against the drive
tube and locked in position to save space during
transportation.
WARNING
To reduce the risk of injury, always shut off the
engine – depress stop switch – and fit the blade
scabbard before moving the cutter bar to the
transport position or from the transport position
to the normal working position.
WARNING
The gearbox gets hot during operation. To
reduce the risk of burn injury, do not touch the
gearbox.
0000-GXX-1686-A0
1
2
3
► Shut off the engine.
► Fit the blade scabbard.
► Pull back the sliding sleeve (1) and use the
lever (2) to swing the joint upwards – in direc‐
tion of drive tube – until the cutter bar is flat
against the drive tube.
► Release the sliding sleeve (1) and make sure
the lock pin engages the quadrant (3).
9 Fitting the Harness
Some versions of the machine can be carried on
a shoulder strap.
The type and style of the shoulder strap depend
on the market.
9.1 Shoulder Strap
1
388BA037 KN
3
► Put on the shoulder strap (1).
► Adjust the length of the strap.
English 9 Fitting the Harness
14 0458-519-8321-D

► With the power tool attached, the carabiner (3)
must be at about the same height as your right
hip.
9.2 Attaching Machine to Shoulder
Strap
1
002BA308 KN
2
1
2
► Attach the carabiner (1) to the carrying ring (2)
on the drive tube – hold the carrying ring
steady.
9.3 Disconnecting Machine from
Shoulder Strap
1
002BA310 KN
2
1
2
► Press down the bar on the carabiner (1) and
pull the carrying ring (2) out of the carabiner.
9.4 Throwing Off the Machine
WARNING
The machine must be quickly thrown off in the
event of imminent danger. Practice removing and
putting down the machine as you would in an
emergency. To avoid damage, do not throw the
machine to the ground when practicing.
Practice quickly detaching the power tool from
the carabiner as described under "Disconnecting
Machine from Shoulder Strap".
If you are using a shoulder strap: Practice slip‐
ping the strap off your shoulder.
10 Starting / Stopping the
Engine
10.1 Controls
0208BA066 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".
10 Starting / Stopping the Engine English
0458-519-8321-D 15

10.1.1 Function of Stop Switch and Ignition
System
The ignition is switched off and the engine stop‐
ped when the stop switch is pressed. The stop
switch returns automatically to the Run position
when it is released: The ignition is switched on
again after the engine stops – the engine is then
ready to start.
10.1.2 Function of Throttle Set Wheel
0208BA067 KN
4
The throttle set wheel (4) enables the travel of
the throttle trigger to be preset anywhere
between idle and full throttle.
–Turn throttle set wheel (4) in direction of – to
reduce throttle trigger travel and maximum
engine speed.
–Turn throttle set wheel (4) in direction of + to
increase throttle trigger travel and maximum
engine speed.
–It is possible to override the preset stop and
open the throttle wide by pulling the throttle
trigger firmly – the preset stop remains unaf‐
fected. The original setting is restored when
the throttle trigger is released.
10.2 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.
10.2.1 Cranking
1191BA014 KN
► Place the machine on the ground: It must rest
securely on the engine support and the gear‐
box housing.
► On units with an adjustable cutter bar and
defined transport position: Set the cutter bar to
the straight (0°) position.
► If fitted: Remove blade scabbard from the cut‐
ting blades.
To reduce the risk of accidents, check that the
cutting blades are not touching the ground of any
other obstacles.
► Make sure you have a firm footing, either
standing, stooping or kneeling.
► Hold the machine firmly on the ground with
your left hand and press down – do not touch
the throttle trigger, lockout lever or stop switch.
English 10 Starting / Stopping the Engine
16 0458-519-8321-D

NOTICE
Do not stand or kneel on the shaft.
1191BA015 KN
► Hold the starter grip with your right hand.
10.2.2 Version without ErgoStart
► Pull the starter grip slowly until you feel it
engage and then give it a brisk strong pull.
10.2.3 Version with ErgoStart (C‑E)
► Pull the starter rope 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.
10.2.4 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.
1191BA025 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 cutting blades must not move when the
engine is idling.
Your machine is now ready for operation.
10.3 Stopping the Engine
► Depress the momentary contact stop switch –
the engine stops – release the stop switch – it
springs back to the run position.
10.4 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 position F until the engine
runs.
If the engine does not start
► Check that all settings are correct.
► Check that there is fuel in the tank and refuel if
necessary.
► Check that the spark plug boot is properly con‐
nected.
► Repeat the starting procedure.
Engine is flooded
►Move the choke knob to F and continue crank‐
ing until the engine runs.
Fuel tank run until completely dry
► After refueling, 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.
11 Operating Instructions
11.1 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
11 Operating Instructions English
0458-519-8321-D 17

period. The engine develops its maximum power
after about 5 to 15 tank fillings.
11.2 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.
11.3 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".
12 Cleaning the Air Filter
12.1 If there is a noticeable loss of
engine power
0208BA034 KN
1
►Set knob for warm start (1) to g
► Turn screw (2) in filter cover (3) counterclock‐
wise until the cover is loose
► Remove filter cover (3)
► Clean away loose dirt from around the filter
0208BA035 KN
5
4
► Grip into the recess (4) in the filter housing
and remove the felt filter (5)
► Replace felt filter (5) – as a temporary meas‐
ure you can knock it out on the palm of you
hand or blow it out with compressed air – do
not wash
NOTICE
Replace any damaged parts!
► Insert felt filter (5) form-fittingly into the filter
housing
►Set knob for warm start (1) to g
► Fit filter cover (3) – make sure not to tilt the
screw (2) – insert screw and tighten
13 Engine Management
Exhaust emissions are controlled by the design
of the engine and components (e.g. carburation,
ignition, timing and valve or port timing).
14 Adjusting the Carburetor
0208BA036 KN
The carburetor of the machine has been adjus‐
ted at the factory for optimum performance and
fuel efficiency in all operating states.
14.1 Setting the idle speed
Engine stops when idling
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly.
Cutting blades move when idling
► Turn the idle speed adjusting screw (LA)
slowly counterclockwise until the cutting
blades stop moving
WARNING
If the cutting blades continue to move in idle
even after adjustment, have the machine
repaired by a STIHL servicing dealer.
15 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
English 12 Cleaning the Air Filter
18 0458-519-8321-D

► 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".
15.1 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,
15.2 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.
–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.
15.3 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.
16 Lubricating the Gearbox
16.1 Blade Drive Gear
Lubricate the blade drive gear with STIHL gear
lubricant for hedge trimmers – see "Special
Accessories".
16 Lubricating the Gearbox English
0458-519-8321-D 19

16.1.1 HL 0° version
1
0000-GXX-1687-A0
16.1.2 Adjustable HL 145° version
1
0000-GXX-1688-A0
► Check the lubricant level at regular intervals of
about every 25 hours of operation. Unscrew
the filler plug (1) – if no grease can be seen on
the inside of the filler plug, screw the tube of
grease into the filler hole.
► Squeeze up to 10 g (2/5 oz) grease into the
gearbox.
NOTICE
Do not completely fill the gearbox with grease.
► Unscrew the tube of grease from the filler
hole.
► Refit the filler plug and tighten it down firmly.
16.2 Angle Drive Gear
Lubricate the angle drive gear with STIHL gear
lubricant for hedge trimmers (special accessory).
16.2.1 Adjustable HL 145° version
0000-GXX-1689-A0
2
► Check the lubricant level at regular intervals of
about every 25 hours of operation. Unscrew
the filler plug (2) – if no grease can be seen on
the inside of the filler plug, screw the tube of
grease into the filler hole.
► Squeeze up to 5 g (1/5 oz) grease into the
gearbox.
NOTICE
Do not completely fill the gearbox with grease.
► Unscrew the tube of grease from the filler
hole.
► Refit the filler plug and tighten it down firmly.
17 Sharpening Instructions
When cutting performance and behavior begin to
deteriorate, i.e. blades frequently snag on
branches: Resharpen the cutting blades.
It is best to have the cutting blades resharpened
by a dealer on a workshop sharpener. STIHL
recommends an authorized STIHL servicing
dealer.
It is also possible to use a flat crosscut sharpen‐
ing file. Hold the sharpening file at the prescribed
angle (see "Specifications").
► Only sharpen the cutting edge.
► Always file towards the cutting edge.
► The file only sharpens on the forward stroke –
lift it off the blade on the backstroke.
► Use a whetstone to remove burr from cutting
edges.
► Remove as little material as possible.
► After sharpening, clean away filing or grinding
dust and then spray the cutting blades with
STIHL resin solvent.
English 17 Sharpening Instructions
20 0458-519-8321-D