STIHL HS 45
{
Instruction Manual
Notice d’emploi
G Instruction Manual
1 - 26
F Notice d’emploi
27 - 54
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Using the Unit 8
Fuel 9
Fueling 10
Starting / Stopping the Engine 10
Operating Instructions 12
Original Instruction ManualPrinted on chlorine-free paper
Cleaning the Air Filter 12
Engine Management 13
Adjusting the Carburetor 13
Checking the Spark Plug 15
Engine Running Behavior 16
Lubricating the Gearbox 16
Rewind Starter 17
Storing the Machine 17
Sharpening Instructions 17
Inspections and Maintenance by
Dealer 18
Maintenance and Care 19
Main Parts 21
Specifications 22
Printing inks contain vegetable oils, paper can be recycled.
Special Accessories 23
Maintenance and Repairs 23
Disposal 24
STIHL Limited Emission Control
Warranty Statement 24
Dear Customer,
Thank you for choosing a quality
engineered STIHL product.
It 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 product.
Please contact your dealer or our sales
company if you have any queries
concerning this product.
Your
Dr. Nikolas Stihl
{
© ANDREAS STIHL AG & Co. KG, 2013
0458-253-8221-A. VA1.F13.
0000000156_006_GB
HS 45
This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
1
English
Guide to Using this Manual
Pictograms
The meanings of the pictograms
attached to the machine are explained in
this manual.
Depending on the model concerned, the
following pictograms may be attached to
your machine.
Fuel tank; fuel mixture of
gasoline and engine oil
Operate manual fuel
pump
Filler hole for gear
lubricant
Blade lock
Rotating handle
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 precautions must be observed
when working with this
power tool because it has
very sharp, high-speed
cutting blades.
It is important you read
and understand the
instruction manual before
first use and keep the
manual in a safe place for
future reference. Nonobservance of the
instruction manual may
result in serious or even
fatal injury.
Observe all application local safety
regulations, standards and ordinances.
If you have not used this type of power
tool before: Have your dealer or other
experienced user show you how to
operate your power tool or attend a
special course in its operation.
Minors should never be allowed to use a
power tool.
Keep bystanders, especially children,
and animals away from the work area.
When the power tool is not in use, shut it
off so that it does not endanger others.
Secure it against unauthorized use.
The user is responsible for avoiding
injury to third parties or damage to their
property.
2
HS 45
English
Do not lend or rent your power tool
without the instruction manual. Be sure
that anyone using it understands the
information contained in this manual.
The use of noise emitting power tools
may be restricted to certain times by
national or local regulations.
To operate the power tool you must be
rested, in good physical condition and
mental health.
If you have any condition that might be
aggravated by strenuous work, check
with your doctor before operating a
power tool.
Persons with pacemakers only: The
ignition system of your power tool
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. STIHL
recommends that persons with
pacemakers consult their physician and
the pacemaker manufacturer to reduce
any health risk.
Do not operate the power tool if you are
under the influence of any substance
(drugs, alcohol) which might impair
vision, dexterity or judgment.
Use your hedge trimmer only for cutting
hedges, shrubs, scrub and similar
materials. Do not use your power tool for
any other purpose because of the
increased risk of accidents.
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 use parts 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 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 pressure washer to clean
the power tool. The solid jet of water
may damage parts of the power tool.
Clothing and Equipment
Wear proper protective clothing and
equipment.
Clothing must be sturdy
but allow complete freedom of movement. Wear
snug-fitting clothing, an
overall and jacket combination, do not wear a
work coat.
Avoid clothing that could get caught on
branches or brush or moving parts of the
machine. Do not wear a scarf, necktie or
jewelry. Tie up and confine long hair
(e.g. with a hair net, cap, hard hat, etc.).
Wear sturdy shoes with non-slip soles.
Wear safety glasses and
hearing protection, e.g.
earplugs or ear muffs.
Wear heavy-duty gloves.
STIHL offers a comprehensive range of
personal protective clothing and
equipment.
Transporting the Power Tool
Always turn off the engine.
Always fit the blade guard (scabbard)
before carrying your hedge trimmer
short distances.
Carry the power tool by the handle –
cutting blades behind you. Avoid
touching hot parts of the machine,
especially the muffler and gear housing
– you could suffer serious burns.
In vehicles: Properly secure your power
tool to prevent turnover, fuel spillage and
damage.
Fueling
Gasoline is an extremely
flammable fuel. Keep
clear of naked flames. Do
not spill any fuel – do not
smoke.
Always shut off the engine before
refueling.
HS 45
3
English
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.
– Engage the blade lock (if fitted).
– Slide control / stop switch must
move easily to STOP or 0
– Smooth action of throttle trigger
lockout and throttle trigger – the
throttle trigger must return
automatically to the idle position.
– Check that the spark plug boot is
secure – a loose boot may cause
arcing that could ignite combustible
fumes and cause a fire.
– Cutting blades securely mounted
and in good condition (clean, move
freely, not warped), properly
sharpened and thoroughly sprayed
with STIHL resin solvent (lubricant).
– Check cutter guard (if fitted) for
damage.
– Never attempt to modify the controls
or safety devices in any way.
– Keep the handles dry and clean –
free from oil and dirt – for safe
control of the power tool.
To reduce the risk of personal injury, do
not operate your power tool if it is
damaged or not properly assembled.
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.
To reduce the risk of injury, avoid
contact with the cutting blades.
Do not drop start the power tool – start
the engine as described in the
instruction manual.
Note that the cutting blades continue to
run for a short period after you let go of
the throttle trigger – flywheel effect.
Check idle speed setting: The cutting
blades must not move when the engine
is idling with the throttle trigger released.
Holding and Controlling the Power Tool
Always hold the power tool firmly with
both hands on the handles. Wrap your
fingers and thumbs around the handles.
Starting the Engine
Start the engine at least 3 meters from
the fueling spot, outdoors only.
4
HS 45
English
Right-handers
Right hand on the control handle and left
hand on the front handle.
Left-handers
Left hand on the control handle and right
hand on the front handle.
Make sure you have firm and secure
footing and hold the power tool so that
the cutting blades are always away from
your body.
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 0 or STOP.
Check that there are no bystanders in
the general work area.
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.
Make sure the idle speed setting is
correct. The cutting blades must not run
when the engine is idling with the throttle
trigger released.
If the cutting blades still run, have your
dealer check your machine and make
proper adjustments or repairs. Check
and correct the idle speed setting
regularly.
Note that the cutting blades continue to
run for a short period after you let go of
the throttle trigger – flywheel effect.
The gearbox becomes hot during
operation. To reduce the risk of burn
injury, do not touch the gearbox housing.
Take special care in slippery conditions,
on slopes or uneven ground.
Clear away fallen branches, scrub and
cuttings.
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 or in a tree
– Never work on an insecure support
– Never operate your power tool 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 colorless and
odorless and contain
unburned hydrocarbons
and benzol. Never run
the engine indoors or in
poorly ventilated locations, even if your model
is equipped with a catalytic converter.
To reduce the risk of serious or fatal
injury from breathing toxic fumes,
ensure proper ventilation when working
in trenches, hollows or other confined
locations.
To reduce the risk of accidents, stop
work immediately in the event of
nausea, headache, visual disturbances
(e.g. reduced field of vision), problems
with hearing, dizziness, deterioration in
ability to concentrate. Apart from other
possibilities, these symptoms may be
caused by an excessively high
concentration of exhaust gases in the
work area.
HS 45
5
English
Operate your power tool so that it
produces a minimum of noise and
emissions – do not run the engine
unnecessarily, accelerate the engine
only when working.
To reduce the risk of fire, do not smoke
while operating or standing near your
power tool. Note that combustible fuel
vapor may escape from the fuel system.
If your power tool is subjected to
unusually high loads for which it was not
designed (e.g. heavy impact or a fall),
always check that it is in good condition
before continuing work – see also
"Before Starting". Check the fuel system
in particular for leaks and make sure the
safety devices are working properly. Do
not continue operating your power tool if
it is damaged. In case of doubt, have the
unit checked by your servicing dealer.
Do not operate your power tool in the
starting throttle position – engine speed
cannot be controlled in this position.
Inspect the hedge and work area to
avoid damaging 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 blades.
– Take particular care when cutting
hedges next to or against wire
fences.
To avoid the risk of electrocution, do not
touch electric power lines – never cut
through electric power lines.
Do not touch the cutting
blades while the motor is
running. If the cutting
blades become jammed
by thick branches or
other obstructions, switch
off the engine immediately before attempting to
free the blades – there is
otherwise a risk of injury.
Opening the throttle while the blades 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
cutting blades moving while the engine
is idling.
If the hedge is very dusty or dirty, spray
the blades with STIHL resin solvent from
time to time during cutting. This helps
reduce blade friction as well as the
aggressive effects of sap and the buildup of dirt particles.
The dust that occurs during operation
may be harmful to health. If dust levels
are very high, wear a suitable respirator.
Before leaving the power tool
unattended: Shut off the engine.
Check the cutting blades at regular short
intervals during operation or
immediately if there is a noticeable
change in cutting behavior:
– Shut off the engine.
– Wait until the cutting blades have
come to a complete standstill.
– Check condition and tightness, look
for cracks.
– Check sharpness.
To reduce the risk of fire, always clean
plant residue, chips, leaves and excess
lubricant off the engine and muffler.
After finishing work
Always clean dust and dirt off the
machine – do not use any grease
solvents for this purpose.
Spray the blades with STIHL resin
solvent. Run the motor briefly so that the
solvent is evenly distributed.
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
6
HS 45
English
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.
Maintenance, replacement, or repair of
the emission control devices and
systems may be performed by any
nonroad engine repair establishment or
individual. However, if you make a
warranty claim for a component which
has not been serviced or maintained
properly or if nonapproved replacement
parts were used, STIHL may deny
coverage.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of the instruction
manual.
HS 45
7
English
Using the Unit
Cutting Season
Observe country-specific or municipal
rules and regulations for cutting hedges.
Do not use your power tool during other
people's normal rest periods.
Cutting Sequence
Use lopping shears or a chain saw to cut
out thick branches first.
Cut both sides of the hedge first, then
the top.
Disposal
Do not throw cuttings in the garbage can
– they can be composted!
Working Technique
Vertical Cut
Swing the cutting blade from the bottom
upwards in an arc – lower the nose of the
blade, move along the hedge and then
swing the blade up again in an arc.
Any working position above head height
is tiring. To minimize the risk of
accidents, work in such positions for
short periods only.
Horizontal Cut
Hold the cutter bar at an angle of 0° to
10° as you swing the hedge trimmer
horizontally.
Swing the cutting blade in an arc
towards the outside of the hedge so that
the cuttings are swept to the ground.
8
HS 45
English
Fuel
This engine is certified to operate on
unleaded gasoline and with the mix ratio
50:1.
Your engine requires a mixture of highquality premium gasoline and highquality two-stroke air-cooled engine oil.
Use premium branded unleaded
gasoline with a minimum octane rating
of 89 (R+M)/2.
Note: Models equipped with a catalytic
converter require unleaded gasoline. A
few tankfuls of leaded gasoline can
reduce the efficiency of the catalytic
converter by more than 50%.
Fuel with a lower octane rating may
result in preignition (causing "pinging")
which is accompanied by an increase in
engine temperature. This, in turn,
increases the risk of the piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines etc.), but magnesium castings as
well. This could cause running problems
or even damage the engine. For this
reason it is essential that you use only
high-quality fuels!
Fuels with different percentages of
ethanol are being offered. Ethanol can
affect the running behaviour of the
engine and increase the risk of lean
seizure.
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
with a manually adjustable carburetor
and should not be used in such engines.
Engines equipped with M-Tronic can be
run on gasoline with an ethanol content
of up to 25% (E25).
Use only STIHL two-stroke engine oil or
equivalent high-quality two-stroke aircooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STIHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine
oil or an equivalent quality two-stroke
engine oil for the fuel mix in models
equipped with a catalytic converter.
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapour.
The canister should be kept tightly
closed in order to avoid any moisture
getting into the mixture.
The fuel tank and the canister in which
fuel mix is stored should be cleaned
from time to time.
Fuel mix ratio
Only mix sufficient fuel for a few days
work, not to exceed 3 months of storage.
Store in approved safety fuel-canisters
only. When mixing, pour oil into the
canister first, and then add gasoline.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
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)
Dispose of empty mixing-oil canisters
only at authorized disposal locations.
HS 45
9
English
253BA001 KN
1
253BA002 KN
4
3
2
5
253BA003 KN
6
253BA004 KN
7
253BA005 KN
Fueling
Preparations
N Before fueling, clean the filler cap
and the area around it to ensure that
no dirt falls into the tank.
N Position the machine so that the
filler cap is facing up.
N Open the filler cap.
Starting / Stopping the
Engine
N Observe safety precautions – see
chapter on "Safety Precautions and
Working Techniques".
N Swing the blade lock lever (1)
forwards as far as stop – in direction
of front handle.
N Set the choke lever (6):
l If the engine is cold
j for warm start – also use this posi-
tion if the engine has been running
but is still cold.
N Press the fuel pump bulb (7) at least
five times – even if the bulb is filled
with fuel.
Starting
Fill up with fuel.
Take care not to spill fuel while fueling
and do not overfill the tank.
STIHL recommends you use the STIHL
filler nozzle for fuel (special accessory).
WARNING
After fueling, tighten down the filler cap
as securely as possible by hand.
10
N Move the stop switch (2) to I.
N Press down the interlock lever (3)
and squeeze the throttle trigger (4) –
hold both levers in that position.
N Press in the starting throttle lock (5).
N Let go of the interlock lever, throttle
trigger and starting throttle lock.
This is the starting throttle position.
N Place the unit on the ground.
N Remove the blade scabbard. Check
that the cutting blades are not
touching the ground or any other
obstacles.
N Make sure you have a firm footing.
HS 45
English
8
253BA006 KN
N Hold the unit firmly with your left
hand on the front handle and press
down.
N Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
NOTICE
Do not pull out the starter rope all the
way – it might otherwise break.
N Do not let the starter grip snap back.
Guide it slowly back into the housing
so that the starter rope can rewind
properly.
If the engine is cold (choke set to l)
N Pull the starter rope five times.
N Move the choke lever to j
N Continue cranking until the engine
runs.
If the engine does not start after 10 pulls
with the choke lever set to j:
N Set choke to l, pull the starter
rope five times, move choke to j
and continue cranking.
If the engine is warm (choke set to j)
N Continue cranking until the engine
runs.
If the engine stops during warm-up or
acceleration
N Repeat the starting procedure as
described under "If the engine is
cold".
N Swing the blade lock lever back as
far as stop – in direction of rear
handle.
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.
Shutting off the engine
N Move the stop switch to O.
Other hints on starting
If the engine does not start
N Make sure all settings are correct
(choke shutter, throttle trigger in
starting throttke position, stop
switch to I).
N Repeat the starting procedure.
If the engine still does not start:
N Move the stop switch to O.
N Pull off the spark plug boot (8).
N Unscrew and dry off the spark plug.
N Open the throttle wide.
N Crank the engine several times with
the starter to clear the combustion
chamber.
N Refit the spark plug.
N Connect the spark plug boot (press
it down firmly).
N Move the stop switch to I.
N Set the choke lever to j – even if
the engine is cold.
N Now start the engine.
As soon as the engine runs
N Blip the throttle trigger – the engine
settles down to idle speed.
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11
English
253BA007 KN
7
253BA008 KN
1
2
If fuel tank has been run completely dry
and then refueled
N Press the fuel pump bulb (7) at least
five times – even if the bulb is
already filled with fuel.
N Now start the engine.
Operating Instructions Cleaning the Air Filter
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".
If there is a noticeable loss of engine
power
N Move the choke lever to l.
N Press in the tab (1) and swing the
filter cover (2) down.
N Clean away loose dirt from around
the filter.
12
HS 45
253BA009 KN
4
5
3
2
Engine Management Adjusting the Carburetor
English
N Remove the foam element (3) and
felt element (4).
N Wash the foam element in a clean,
non-flammable solution (e.g. soapy
water) and then dry.
N Fit a new felt element. As a
temporary measure you can knock it
out on the palm of your hand or blow
it out with compressed air. Do not
wash.
N Replace damaged parts.
N Fit the foam element (3) in the filter
cover (2) and the felt element (4) in
the filter housing (5).
N Close the filter cover so that it snaps
into position.
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
N Shut off the engine.
N Check the air filter and clean or
replace if necessary.
N Inspect cutting blades and clean if
necessary (clean, move freely, not
warped).
Different Standard Settings
Different carburetors are installed at the
factory. A different standard setting is
necessary for each of these carburetors.
Standard setting A
– High speed screw (H) = 3/4
– Low speed screw (L) = 1
HS 45
Standard setting B
– High speed screw (H) = 3/4
– Low speed screw (L) = 3/4
13
English
253BA017 KN
L
253BA018 KN
H
L
253BA018 KN
H
L
LA
253BA016 KN
L
N Determine the required standard
setting as follows: Turn the low
speed screw (L) carefully clockwise
as far as stop, then turn it
counterclockwise.
Is range of adjustment more than 1 turn?
N Continue with "Standard setting A"
Is range of adjustment less than 1 turn?
N Continue with "Standard setting B"
Standard setting A
Standard setting B
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 3/4 turn.
Adjusting Idle Speed
N Carry out the standard setting.
N Start and warm up the engine.
Cutting blades run when engine is idling
N Turn the idle speed screw (LA)
counterclockwise until the cutting
blades stop moving – then turn it
another 1/2 to 1 turn in the same
direction.
WARNING
If the cutting blades continue moving
when the engine is idling, have your
power tool checked and repaired by your
servicing dealer.
Erratic idling behavior, poor acceleration
(despite correction to setting of LA
screw).
Idle setting is too lean
N Turn the low speed screw (L) slowly
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise until it is against
its seat, then turn it back 1 full turn
14
N Adjust idle speed with the idle speed
screw (LA) so that the cutting
blades do not run.
Engine stops while idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the cutting blades
must not run.
Fine Tuning for Operation at High
Altitude
A slight correction of the setting may be
necessary if engine does not run
satisfactorily:
N Carry out the standard setting.
N Warm up the engine.
N Turn high speed screw (H) slightly
clockwise (leaner) – no further than
stop.
HS 45
English
000BA002 KN
1
000BA045 KN
NOTICE
After returning from high altitude, reset
the carburetor to the standard setting.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
Checking the Spark Plug
If the engine is down on power, difficult
to start or runs poorly at idle speed, first
check the spark plug.
N Remove the spark plug – see
"Starting / Stopping the Engine".
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.
N Install 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".
To reduce the risk of arcing and fire
If the spark plug comes with a
detachable adapter nut:
N Screw the adapter nut (1) onto the
thread and tighten it down firmly.
HS 45
15
English
3
000BA050 KN
2
1
253BA012 KN
2
Engine Running Behavior Lubricating the Gearbox
On all spark plugs
N Always press the boot (2) firmly on
to the spark plug (3).
If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor is properly
adjusted, the cause may be the muffler.
Have the muffler checked for
contamination (carbonization) by your
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
exclusively by an authorized STIHL
servicing dealer.
Use STIHL gear lubricant for hedge
trimmers (special accessory) to lubricate
the blade drive gear.
After about 50 hours of operation:
N Remove the screw plug (1) from the
gearbox.
N Screw the tube of grease (2) into the
filler hole.
N Squeeze up to 5 g grease into the
gearbox.
16
NOTICE
Do not completely fill the gearbox with
grease.
N Remove the tube of grease (2).
N Refit the filler plug and tighten it
down firmly.
HS 45
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