STIHL HL 75 K, HL 75 Owner's Manual
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Assembling
Safety Precautions Ii
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Operating Instructions
Maintenance
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Contents
English / USA
Guide to Using this Manual .............. 2
Safety Precautions ........................... 3
Assembling the Unit ....................... 12
Using the Hedge Cutter .................. 13
Fuel ................................................ 15
Fueling ............................................ 16
Adjusting Cutter Bar Angle ............. 17
Fitting the Harness ......................... 18
Starting / Stopping the Engine ........ 18
Printing inks contain vegetable oils;
paper can be recycled.
Cleaning the Air Filter ..................... 21
Motor Management ........................ 22
Adjusting the Carburetor ................ 22
Spark Arresting Screen* in Muffler . 24
Checking the Spark Plug ................ 24
Lubricating the Gearbox ................. 25
Replacing the Starter Rope
and Rewind Spring ......................... 26
Sharpening Instructions .................. 29
Operating Instructions .................... 29
Storing the Machine ........................ 29
Maintenance Chart ......................... 30
Parts and Controls .......................... 31
Definitions ....................................... 32
Specifications ................................. 33
Printed on chlorine-free paper.© ANDREAS STIHL AG & Co. KG, 2003
Maintenance and Repairs ............... 34
STIHL Incorporated Federal
and California Emission Control
Warranty Statement ........................ 35
Allow only persons who understand this
manual to operate your hedge cutter.
To receive maximum performance and
satisfaction from your STIHL hedge
cutter, it is important that you read and
understand the maintenance and safety
precautions, starting on page 3, before
using your hedge cutter.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
!Warning!
Because a hedge cutter is a high-speed
cutting tool some special safety
precautions must be observed to reduce
the risk of personal injury.
Careless or improper use may cause
serious or even fatal injury.
STIHL's philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements are made from time to time. If the
operating characteristics or the
appearance of your hedge cutter differs
from those described in this manual,
please contact your STIHL dealer for
information and assistance.
* see “Guide to Using this Manual”
STIHl
0458 389 3021. M1.4. C3. PM. Printed in Germany
1HL 75, HL 75 K
English / USA
Guide to Using this Manual
Pictograms
All the pictograms attached to the
machine are shown and explained in
this manual.
The operating and handling instructions
are supported by illustrations.
Symbols in text
The individual steps or procedures
described in the manual may be marked
in different ways:
: Step or procedure without direct
reference to an illustration.
Description of step or procedure that
refers directly to the illustration and
contains item numbers that appear in
the illustration.
Example:
Loosen the screw (1)
Lever (2) ...
In addition to the operating instructions,
this manual may contain paragraphs
that require your special attention. Such
paragraphs are marked with the
symbols described below:
Warning where there is a risk of an
accident or personal injury or
serious damage to property.
Warning where there is a risk of
damaging the machine or individual
components.
Note or hint which is not essential
for using the machine, but may
improve the operator’s understanding of the situation and result
in better use of the machine.
Note or hint on correct procedure in
order to avoid damage to the
environment.
Equipment and features
This instruction manual refers to
several models with different
features. Components that are not
installed in all models and related
applications are marked thus
Such components are available as
special accessories from your
STIHL dealer.
*.
Engineering improvements
STIHL’s philosophy is to continually
improve all of its products. As a result,
engineering changes and improvements
are made from time to time. If the
operating characteristics or the
appearance of your machine differ from
those described in this manual, please
contact your STIHL dealer for
assistance.
Therefore, we cannot be responsible for
changes, modifications or
improvements not covered in this
manual.
2
HL 75, HL 75 K
Safety Precautions
English / USA
Warning!
Because a hedge cutter is
a high-speed, fast-cutting
power tool, special safety
precautions must be
observed to reduce the risk of personal
injury.
It is important that you
read, fully understand and
observe the following
safety precautions and
warnings. Read the
owner's manual and the
safety instructions periodically. Careless
or improper use of any hedgecutter may
cause serious or fatal injury.
Have your STIHL dealer show you how
to operate your hedge cutter. Observe
all applicable local safety regulations,
standards and ordinances.
!Warning!
The use of any hedge cutter may be
hazardous. If the cutting tool comes in
contact with your body, it will cut you.
Striking solid foreign objects such as
stones, fence wire or metal could
damage the cutting attachment and may
cause blades to crack, chip or break.
STIHL does not recommend the use of
hedge cutters when cutting in areas
where the blades could contact such
objects.
!Warning!
Minors should never be allowed to use a
hedge cutter. Bystanders, especially
children, and animals should not be
allowed in the area where a hedge cutter
is in use.
The operator is responsible for avoiding
injury of third parties and damage to
their property.
Never let the hedge cutter run
unattended.
!Warning!
Do not lend or rent your hedge cutter
without the owner's manual. Be sure that
anyone using your hedge cutter
understands the information contained
in this manual.
Safe use of a hedge cutter involves
1. the operator
2. the hedge cutter
3. the use of the hedge cutter.
THE OPERATOR!
Physical Condition
You must be in good physical condition
and mental health and not under the
influence of any substance (drugs,
alcohol, etc.) which might impair vision,
dexterity or judgment. Do not operate a
hedge cutter when you are fatigued.
Be alert - if you get tired while operating
your hedge cutter, take a break.
Tiredness may result in loss of control.
Working with any hedge cutter can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
a hedge cutter. Prolonged use of a
hedge cutter (or other machines)
exposing the operator to vibrations may
produce whitefinger disease (Raynaud's
phenomenon) or carpal tunnel
syndrome. These conditions reduce the
hand's ability to feel and regulate
temperature, produce numbness and
burning sensations and may cause
nerve and circulation damage and tissue
necrosis.
3HL 75, HL 75 K
English / USA
!Warning!
Antivibration systems do not guarantee
that you will not sustain whitefinger
disease or carpal tunnel syndrome.
Therefore, continual and regular users
should monitor closely the condition of
their hands and fingers. If any of the
above symptoms appear, seek medical
advice immediately.
!Warning!
The ignition system of the STIHL unit
produces an electromagnetic field of a
very low intensity. This field may
interfere with some pacemakers. To
reduce the risk of serious or fatal injury,
persons with pacemaker should consult
their physician and the pacemaker
manufacturer before operating this tool.
Proper Clothing
!Warning!
Hedge cutter operation
can cause serious injury
to eyes, ears and person.
Therefore, to reduce the
risk of injury to your eyes
never operate a hedge
cutter unless wearing goggles or
properly fitted safety glasses with
adequate top and side protection
complying with ANSI Z 87.1 (or your
applicable national standard).To reduce
the risk of injury to your face STIHL
recommends that you also wear a face
shield or face screen over your goggles
or safety glasses.
!Warning!
Hedge cutter noise may
damage your hearing.
Wear sound barriers (ear
plugs or ear mufflers) to
protect your hearing.
Continual and regular
users should have their hearing checked
regularly.
Wear an approved safety hard hat to
reduce the risk of injury to your head
when there is a danger of head injuries.
Wear proper protective clothing.
Protect your hands with
gloves when handling the
hedge cutter and the
cutting tool. Heavy-duty,
nonslip gloves improve
your grip and help to
protect your hands.
Clothing must be sturdy
and snug-fitting, but allow
complete freedom of
movement. Avoid loosefitting jackets, scarfs,
neckties, jewelry, flared or
cuffed pants, unconfined long hair or
anything that could become caught on
branches, brush or moving parts of the
unit. Wear long pants made of heavy
material to protect your legs.
Do not wear shorts.
Good footing is most
important in hedge cutter
work. Wear sturdy boots
with nonslip soles. Steel-
toed safety boots are
recommended.
THE HEDGE CUTTER
For illustrations and definitions of the
hedge cutter parts, see the chapter on
"Parts and Controls"!
4
HL 75, HL 75 K
English / USA
!Warning!
Never modify a hedge cutter in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL hedge cutter
models are authorized. Although certain
unauthorized attachments may be
useable for the STIHL hedge cutter, their
use may, in fact, be extremely
dangerous. Never remove or disable
any safety devices.
USE OF THE HEDGE CUTTER
Transporting the hedge cutter
!Warning!
To reduce the risk of injury from blade
contact, never carry or transport the
hedge cutter with the cutter blades
running. The correct engine idle speed is
important in this respect. If the
carburetor setting is correct, the cutter
blades will be stationary at idle speed.
!Warning!
Always turn off the engine and make
sure the cutting attachment has stopped
before putting the unit down or carrying
it between work stations.
The hedge cutter may be carried only in
a horizontal position. Grip the shaft in a
manner that the machine is balanced
horizontally. Keep the hot muffler away
from your body and the cutting
attachment behind you.
Always switch off the engine and fit the
scabbard over the cutter blades before
transporting the hedge cutter over long
distances. When transporting your
hedge cutter in a vehicle, properly
secure it to prevent turnover, fuel
spillage and damage to the hedge cutter.
Preparation for the use of the hedge
cutter
!Warning!
Never use a hedge cutter that is
damaged or not properly maintained.
Always check your hedge cutter for
proper condition and operation before
starting, particularly the throttle trigger,
throttle trigger interlock, stop switch and
cutting tool. The throttle trigger must
move freely and always spring back in
the idle position.
The cutting tool must be properly
tightened and in safe operating
389BA019 KN
condition. Inspect for loose part (nuts,
screws, etc.) and for cracked, bent,
warped or damaged blades. Regularly
check the condition and tightness of the
cutter blades - with the engine stopped!
5HL 75, HL 75 K
English / USA
Service damaged cutter blades before
using the hedge cutter. Always keep
blades sharp. Keep the handles clean
and dry at all times; it is particularly
important to keep them free of oil and
resin to ensure that you can always
maintain a firm grip and safely control
your machine. Stihl recommends that
you always spray the cutter blades with
STIHL resin solvent before starting work
- with engine stopped! You can obtain
this protective spray from your dealer.
Apply generously.
Fueling
Your STIHL hedge cutter uses an oilgasoline mixture for fuel (see the
chapter on "Fuel" of your owner's
manual).
!Warning!
Gasoline is an extremely
flammable fuel. If spilled
or ignited by a spark or
other ignition source, it
can cause fire and serious
burn injury or property
damage. Use extreme caution when
handling gasoline or fuel mix.
Do not smoke or bring any fire or flame
near the fuel.
Fueling Instructions
Fuel your hedge cutter in well ventilated
areas, outdoors.
!Warning!
Gasoline vapor pressure may build up
inside the gas tank of a two cycle engine
depending on the fuel used, the weather
conditions, and the venting system of
the tank. In order to reduce the risk of
burns or other personal injury from
escaping gas vapor and fumes, remove
the fuel filler cap on your hedge cutter
carefully so as to allow any pressure
build-up in the tank to release slowly.
Never remove fuel filler cap while engine
is running. Select bare ground for fueling
and move at least 10 feet (3 m) from the
fueling spot before starting the engine.
Wipe off any spilled fuel before starting
your hedge cutter and check for
leakage.
Check for fuel leakage while refueling
and during operation. If fuel leakage is
found, do not start or run the engine until
leak is fixed and spilled fuel has been
wiped away. Take care not to get fuel on
your clothing. If this happens, change
your clothing immediately. Never
attempt to fuel a running or hot engine.
!Warning!
Unit vibrations can cause
an improperly tightened
fuel cap to loosen or come
off and spill quantities of
fuel.
In order to reduce risk of fuel spillage
and fire, tighten fuel cap by hand with as
much force as possible.
6
HL 75, HL 75 K
English / USA
Starting
!Warning!
Your hedge cutter
15m (50ft)
assistance. To reduce the risk of injury,
keep bystanders at least 15 m (50 ft)
away.
is a one-person
machine. Start and
operate your
hedge cutter
without
For specific starting instructions, see the
appropriate section of your owner'smanual. Place the hedge cutter on firm
ground or other solid surface in an open
area. Maintain good balance and secure
footing.
!Warning!
When the engine starts at startingthrottle, engine speed will be fast
enough for the clutch to engage and
move the cutting tool.
!Warning!
When you pull the starter grip, don't
wrap the starter rope around your hand.
Do not allow the grip to snap back, but
guide the starter rope to rewind properly.
389BA023 KN
Failure to follow this procedure may
result in injury to hand or fingers and
may damage the starter mechanism.
Catalytic converter
!Warning!
Some STIHL hedge cutter
models are equipped with
a catalytic converter,
which is designed to
reduce the exhaust
emissions of the engine
by a chemical process in the muffler.
Due to this process, the muffler does not
cool down as rapidly as conventional
mufflers when the engine returns to idle
or is shut off. To reduce the risk of fire
and burn injuries, the following specific
safety precautions must be observed.
!Warning!
Since a muffler with a catalytic converter
cools down less rapidly than conventional mufflers, always set your hedge
cutter down in the upright position and
never locate it where the muffler is near
dry brush, grass, wood chips or other
combustible materials while it is still hot.
7HL 75, HL 75 K
English / USA
Let the engine cool down sitting on
concrete, metal, bare ground or solid
wood (e.g. the trunk of a felled tree)
away from any combustible substances.
!Warning!
To reduce the risk of fire or burn injury,
let the unit cool down before refueling
your hedge cutter after use.
!Warning!
Never disassemble or modify your
muffler. The muffler could be damaged
and cause an increase in heat radiation
or sparks, thereby increasing the risk of
fire or burn injury. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL Servicing Dealer only.
!Warning!
To reduce the risk of fire or burn injury,
keep the area around the muffler clean.
Remove all debris such as pine needles,
branches or leaves.
!Warning!
An improperly mounted or damaged
cylinder housing or a damaged/
deformed muffler shell may interfere
with the cooling effect of the catalytic
converter. To reduce the risk of fire or
burn injury, do not continue work with a
damaged or improperly mounted
cylinder housing or a damaged/
deformed muffler shell. Your catalytic
converter is furnished with screens
designed to reduce the risk of fire from
the emission of hot particles. Due to the
heat from the catalytic reaction, these
screens will normally stay clean and
need no service or maintenance. If you
experience loss of performance and you
suspect a clogged screen, have your
muffler maintained by a STIHL Servicing
Dealer.
Working Conditions
Do not operate using the starting throttle
lock as you do not have control of the
engine speed. See section of your
owner's manual on the proper use of the
slide control.
!Warning!
Your hedge cutter pro-
duces poisonous exhaust
fumes as soon as the
combustible engine is
running.
These gases (e.g. carbon monoxide)
may be colorless and odorless.
To reduce the risk of injury from
inhalation of poisonous fumes, start and
operate your hedge cutter only outdoors
in a well ventilated area. Hold your
hedge cutter in such a way that you do
not breath in the exaust fumes.
Operate the hedge cutter under good
visibility and daylight conditions only.
!Warning!
Make sure you always have good
footing. Take particular care in slippery
conditions and on slopes. Be careful on
un-even ground. Watch out for stumps,
roots, ditches or holes which could
cause you to trip or stumble.
8
HL 75, HL 75 K
English / USA
Before you start work, examine the
hedge area for stones, fence wire, metal
or other solid objects which could
damage the cutter blades.
When working close the ground, make
sure that no sand, grit or stones get
between the cutter blades.
!Warning!
When cutting the top of a taller hedge,
when visibility is obstructed check backside of the hedge frequently for
bystanders, animals and obstructions.
Danger!
The hedge cutter is not
insulated against electric
shock. To reduce the risk
of electrocution, never
operate the hedge cutter in the vicinity of
any wires or cables (power, etc.) which
may be carrying electric current.
Operating instructions
Do not cut any material other than
hedges and shrubs. The cutting tools
may be used only for the operations
described in your manual.
!Warning!
To reduce the risk of injury from loss of
control, always hold your hedge cutter
firmly with both hands while you are
working. Your right hand should grip the
rear handle. This also applies to lefthanders. Wrap your fingers tightly
around the front and rear handles.
!Warning!
Never attempt to operate
any hedge cutter with one
hand. Loss of control of
the hedge cutter can
result in serious or fatal
injury. To avoid the risk of
serious injury, never teach the moving
cutter blades.
Always work calmly and carefully, stay
alert so as not to endanger others. If the
cutter blades become jammed by thick
branches or any other obstruction,
switch off the engine immediately before
attempting to free the blades.
!Warning!
On units with an adjustable cutter bar:
Always shut off the engine before
making any adjustments. To reduce the
risk of injury, never touch the blades
while making adjustments (fit the
scabbard over the blades).
!Warning!
The gearbox becomes hot in operation.
To reduce the risk of burn injury, do not
389BA024 KN
touch the gearbox housing.
!Warning!
To reduce the risk of injury from loss of
control, never work on a ladder, in a tree
or any other insecure support.
!Warning!
The cutter blades tend to run on for a
short period after the throttle trigger is
released (flywheel effect).
9HL 75, HL 75 K
English / USA
Important adjustments
!Warning!
To reduce the risk of personal injury from
loss of control or contact with the
running cutting blades, do not use a
hedge cutter with incorrect idle
adjustment. At correct idle speed, the
cutting blades should not move. For
directions to adjust idle speed, see the
appropriate section of your owner's
manual. If you cannot set the correct idle
speed, have your STIHL dealer check
your hedge cutter and make proper
adjustments or repairs.
MAINTENANCE, REPAIR AND
STORING
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 claim
warranty for a component which has
not been serviced or maintained
properly or if nonapproved
replacement parts were used, STIHL
may deny warranty.
Use only STIHL replacement parts for
maintenance and repair. Use of parts
manufactured by others may cause
serious or fatal injury.
Follow the maintenance and repair
instructions in the appropriate section of
your owner's manual. Refer to the
maintenance chart at the last pages of
this manual.
!Warning!
Always stop the engine and make sure
that the cutting tool is stopped before
doing any maintenance or repair work or
cleaning the hedge cutter. Do not
attempt any maintenance or repair work
not described in your owner's manual.
Have such work performed at your
STIHL service shop only.
!Warning!
Check condition of cutting tool at regular
short intervals. If behavior of tool
changes, check it immediately for
tightness or any signs of cracks in
particular. Replace damaged or dull
cutting tools immediately, even if they
have only superficial cracks.
Never repair damaged cutting
attachments by welding, straightening or
modifying the shape. This may cause
parts of the cutting tool to come off and
result in serious or fatal injuries.
10
HL 75, HL 75 K
English / USA
!Warning!
To reduce the risk of fire, check fuel filler
cap for leaks at regular intervals. Use
the specified spark plug and make sure
it and the ignition lead are always in
good condition.
Keep spark plug and wire connection
tight and clean. The spark plug electrode
gap should be checked with a feeler
gauge at least every 50 operating hours
and reset if necessary. Fit a new spark
plug if the electrodes are badly pitted.
Keep cutting tool sharp. Tighten all nuts,
bolts and screws except the carburetor
adjustment screws after each use.
Always clean dust and dirt off the
machine after finishing work.
Do not use a grease solvent for
cleaning! In some countries an aerosol
can of resin solvent (protective spray),
Part No. 0782 420 1002, is available for
spraying the cutter blades.
This resin solvent protects the cutter
blades and has anticorrosive properties.
Spray the cutter blades before and after
work. Then start and run the hedge
cutter briefly so that the resin solvent is
evenly distributed over the blades. If the
hedge itself is very dusty and dirty, spray
the cutter blades more frequently. This
greatly reduces blade friction and the
damaging effects of sap and dust
particles.
!Warning!
Do not operate your hedge cutter if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
Never touch a hot muffler or burn will
result. If your muffler was equipped with
a spark-arresting screen to reduce the
risk of fire (e.g. in the USA, Canada and
Australia), never operate your hedge
cutter if the screen is missing or
damaged. Remember that the risk of
forest fires is greater in hot or dry
weather.
Keep the engine and muffler free from
cuttings, chips, leaves, fibers and
excess lubricant.
For any maintenance please refer to the
maintenance chart and to the warranty
statement near the end of this manual.
Store hedge cutter in a dry and high or
locked location out of reach of children.
Before storing for longer than a few
days, always empty the fuel tank.
11HL 75, HL 75 K
English / USA
Assembling the Unit
11
2
2
1
Mounting the Loop Handle
Not necessary on 0° fixed angle
version with handle hose on the
drive tube.
: Fit the square nuts (1) in the barrier
bar (2) – the holes must line up.
1
2
4
5
7
389BA001 KN
: Fit the clamp (3) in the loop
handle (4) and place them both
on the drive tube (5).
: Place clamp (6) in position and fit
the barrier bar (2) so that the holes
line up.
: Insert screws (7) and tighten them
down moderately against the barrier
bar.
A
4
3
6
7
389BA002 KN
: Align the loop handle (4) and move
it to the most comfortable position.
On HL 75 K, distance A must not be
more than 30 cm (12”) – about
25 cm (10”) is recommended.
On HL 75, distance A must not be
more than 55 cm (22”) – about
35 cm (14”) is recommended
: Tighten down the screws (7)
securely.
389BA042 KN
12
HL 75, HL 75 K
10
9
9
5
Mounting the Gearbox
: Loosen the clamp screws (9).
: Push the drive tube (5) into the
gearbox (10) – turn the gearbox
back and forth as necessary.
10
11
225BA001 KN
: Once the end of the drive tube is
inserted beyond the slot in the
clamp (11), push it fully home as far
as stop.
: Fit the clamp screws and tighten
down moderately.
: Line up the gearbox (10).
: Tighten down the clamp screws
firmly..
English / USA
Using the Hedge Cutter
Do not use your hedge cutter during
rest periods customary in the
neigborhood.
Preparations
Use lopping shears to cut out thick
branches first.
Always wear a harness..
Cutting sequence
If a radical cut is necessary, cut a little at
a time in several stages.
Cutting techniques
Vertical cut:
Swing the cutter bar up and down in an
389BA043 KN
arc as you move along the hedge – use
both sides of the cutting blades.
Horizontal cut:
Hold the cutter bar at an angle of 0° to
10° as you swing the hedge cutter
horizontally.
Swing the cutter bar in an arc towards
the outside of the hedge so that the
cuttings are swept on to the ground.
Do not throw cuttings in the rubbish
bin (garbage can) – they can be
composted!
13HL 75, HL 75 K
English / USA
Horizontal cut
(with angled cutter bar)
Cutting close to the ground from a
standing position, e.g. low shrubs (not
with HL 75 K).
14
389BA044 KN
Vertical cut
(with angled cutter bar)
Cutting without standing directly next to
hedge, e.g. flowerbed between operator
and hedge.
389BA049 KN
Vertical cut
(with straight cutter bar)
Large working radius even without
additional aids.
389BA050 KN
HL 75, HL 75 K
Overhead cut
(with angled cutter bar)
Hold the hedge cutter above your head
and swing it in an arc to make maximum
use of its reach.
Any working position above head
height is tiring. To minimize the risk
of accidents, work in such positions
for short periods only. Set angle of
adjustable cutter bar to maximum so
that the unit can be held in a lower,
less tiring position (with harness)
while still providing adequate
vertical reach.
389BA009 KN
Horizontal cut
(with straight cutter bar)
Cutting without standing directly in front
of the hedge, e.g. reaching over a
flowerbed.
English / USA
Fuel
This engine is certified to operate on
unleaded gasoline and with the mix
ratio 50:1.
Your two-stroke engine requires a
mixture of brand-name gasoline and
quality two-stroke engine oil with the
classification TC.
Use regular branded unleaded gasoline
with a minimum octane rating of 89
RON. If the octane rating of the regular
grade gasoline in your area is lower use
premium unleaded fuel.
Note: Units with a catalytic converter
require unleaded gasoline. The
efficiency of the catalytic converter can
drop more than 50 % if several tankfuls
of leaded gasoline are used.
389BA047 KN
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
name branded fuels!
15HL 75, HL 75 K
English / USA
Fueling
Use only STIHL two-stroke engine oil or
equivalent branded two-stroke aircooled engine oils with the classification
TC for mixing.
We recommend STIHL 50:1 two-stroke
engine oil since it is specially formulated
for use in STlHL engines.
Do not use BIA or TCW (two-stroke
water cooled) mix oils.
Use only STIHL 50:1 heavy-duty
engine oil or equivalent quality two
stroke engine oils for the fuel mix in
models 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 ages
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.
Gasoline
Oil (STIHL 50:1 or
equivalent branded TC oils)
US gal. US fl.oz
12.6
2 1/2 6.4
5 12.8
Dispose empty mixing-oil canisters only
at authorized disposal locations.
389BA031 KN
Before fueling, clean the filler cap and
the area around it to ensure that no dirt
falls into the tank.
Always thoroughly shake the mixture in
the canister before fueling your
machine.
In order to reduce the risk of burns
or other personal injury from
escaping gas vapor and fumes,
remove the fuel filler cap carefully
so as to allow any pressure build-up
in the tank to release slowly.
After fueling, tighten fuel cap as
securely as possible by hand.
16
HL 75, HL 75 K
Change the fuel pick up body every
year.
Before storing your machine for a long
period, drain and clean the fuel tank and
run engine until carburetor is dry.
Adjusting Cutter Bar Angle
(adjustable version only)
2
3
The angle of the cutter bar can be
adjusted to 8 positions between 0°
(straight) and 90° (right angle).
This choice of angles helps enhance the
versatility of the unit.
389BA032 KN
1
English / USA
To adjust cutter blade angle
: Shut off the engine.
: Pull back the sliding sleeve (1) and
use lever (2) to adjust joint by one or
several holes.
: Release the sliding sleeve and
388BA012 KN
allow pin to engage the quadrant
(3).
Sliding sleeve butts against the
housing when the pin is properly
engaged (after making adjustment).
17HL 75, HL 75 K
English / USA
Fitting the Harness
1
3
Shoulder strap
: Put on the shoulder strap (1).
: Adjust length until the spring hook
(3) rests against your right hip.
3
389BA040 KN
Full harness*
: Put on the full harness (2).
: Adjust length until the spring hook
(3) rests against your right hip.
Starting / Stopping the Engine
2
STOP
START
3
2
1
389BA041 KN
Starting
: Hold down the trigger interlock (1)
and squeeze the throttle trigger (2).
: Move the slide control (3) to the
START position.
: Now release the throttle trigger,
slide control and trigger interlock
in that order. This is the starting
throttle position.
225BA003 KN
18
* see chapter
“Symbols Used in this Manual“
HL 75, HL 75 K
: Set the choke lever (4):
3
For cold start to g
For warm start to e
(also use this setting if the engine
has been running but is still cold)
5
55BA008
: Press the fuel pump bulb (5) at least
five times even if bulb is already
filled with fuel.
English / USA
: Place the unit on the ground: It must
rest securely on the engine support
and the gearbox.
: Remove the blade scabbard.
: Check that the cutting tool is not
touching the ground or any other
obstacles. lf necessary, rest the
392BA002 KN
gearbox on a raised support (e.g.
mound, brick or something similar).
: Make sure you have a firm footing.
: Hold the unit with your left hand and
press it down firmly – your thumb
should be under the fan housing.
Do not stand or kneel on the drive
tube since it will otherwise be
permanently bent and damaged.
389BA013 KN
19HL 75, HL 75 K
English / USA
: Pull the starter grip slowly with your
right hand until you feel it engage
and then give it a brisk strong pull.
Do not pull out the starter rope 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.
STOP
3
START
STOP
3
START
2
20
When engine begins to fire:
: Move the choke lever to e and
continue cranking.
As soon as engine runs:
: Blip the throttle trigger (2) – the slide
control (3) moves to the run position
# – and the engine settles down to
idle speed.
Make sure the carburetor is
correctly adjusted – cutting blades
must not run when the engine is
idling.
Your hedge cutter is now ready for
operation.
225BA005 KN
To shut down the engine:
: Move the slide control (3) to $
(STOP).
At very low outside temperatures
As soon as the engine runs:
: Blip the throttle trigger to disengage
the starting throttle position –
the slide control moves to the run
position # and the engine settles
down to idle speed.
: Open the throttle slightly and allow
engine to warm up for a brief period.
HL 75, HL 75 K
225BA006 KN
English / USA
Cleaning the Air Filter
6
5
2
1
If the engine does not start
If you did not move the choke lever to
e quickly enough after the engine
began to fire, the combustion chamber is
flooded.
: Move slide control to $ (STOP).
: Pull off the spark plug boot (6).
: Unscrew and dry off the spark plug.
: Squeeze throttle trigger all the way
to open the throttle wide.
: Crank the engine several times with
the starter to clear the combustion
chamber.
392BA005 KN
: Refit the spark plug.
: Connect the spark plug boot (press
it down firmly).
: Move slide control to START.
: Set choke lever to e, even if engine
is cold.
: Now start the engine.
Fuel tank run until dry
: After refueling, press the fuel pump
bulb (5) at least five times – even if
bulb is filled with fuel.
: Now start the engine.
392BA002 KN
Dirty air filters reduce engine power
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power
: Move choke lever to g.
: Press in the tab (1).
: Ease the filter cover (2) over the tab
and take it away.
: Clean away loose dirt from around
the filter.
: Remove the foam and felt filter
elements.
355BA014 KN
21HL 75, HL 75 K
English / USA
Motor Management Adjusting the Carburetor
2
3
4
: Wash the foam element in a clean,
non-flammable cleaning solution
(e.g. warm soapy water) and then
dry.
: Fit 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.
Replace damaged parts!
: Install the foam element (3) in the
filter cover (2).
: Place felt element (4) (lettering
facing inward) in filter housing (5).
: Fit filter cover so that it snaps into
position.
5
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.
355BA031 KN
355BA032 KN
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed screw within fine
limits.
22
HL 75, HL 75 K
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