Stihl HL 94 User Manual
STIHL HL 94
WARNING
Read Instruction Manual thoroughly
before use and follow all safety
precautions – improper use can
cause serious or fatal injury.
ADVERTENCIA
Antes de usar la máquina lea y siga
todas las precauciones de
seguridad dadas en el manual de
instrucciones – el uso incorrecto
puede causar lesiones graves o
mortales.
{
Instruction Manual
Manual de instrucciones
Instruction Manual
1 - 39
Manual de instrucciones
40 - 83
Contents
English
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 2
Using the Unit 11
Approved Power Tool Attachments 14
Assembling the Unit 14
Fuel 15
Fueling 17
Original Instruction ManualPrinted on chlorine-free paper
Adjusting the Cutter Bar 17
Fitting the Harness 19
Starting / Stopping the Engine 20
Operating Instructions 22
Cleaning the Air Filter 22
Engine Management 23
Adjusting the Carburetor 23
Spark Plug 24
Lubricating the Gearbox 25
Sharpening Instructions 26
Storing the Machine 26
Inspection and Maintenance by
User 27
Inspections and Maintenance by
Printing inks contain vegetable oils, paper can be recycled.
Dealer 27
Maintenance and Care 29
Main Parts 31
Specifications 33
Maintenance and Repairs 34
Disposal 34
Limited Warranty 34
STIHL Incorporated Federal
Emission Control Warranty
Statement 35
STIHL Incorporated California
Exhaust and Evaporative
Emissions Control Warranty
Statement 37
Trademarks 39
Allow only persons who fully 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,
understand and follow the safety
precautions and the operating and
maintenance instructions in chapter
"Safety Precautions and Working
Techniques" before using your hedge
cutter. For further information you can
go to www.stihlusa.com.
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.
{
© ANDREAS STIHL AG & Co. KG, 2017
0458-519-8621-B. VA1.L17.
0000007689_003_GB
HL 94, HL 94 K
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 or embossed on the
machine are explained in this manual.
Depending on the model concerned, the
following pictograms may be on your
machine.
Fuel tank for gasoline
and engine oil mixture
Press to operate manual
fuel pump
Filler hole for gear
lubricant
Symbols in Text
Many operating and safety instructions
are supported by illustrations.
The individual steps or procedures
described in the manual may be marked
in different ways:
N A bullet marks a step or procedure.
A description of a step or procedure that
refers directly to an illustration may
contain item numbers that appear in the
illustration. Example:
N Loosen the screw (1).
N 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 and signal words described
below:
DANGER
Indicates a hazardous situation that, if
not avoided, will result in death or
serious injury.
WARNING
Indicates a hazardous situation that, if
not avoided, could result in death or
serious injury.
NOTICE
Indicates a risk of property damage,
including damage to the machine or its
individual components.
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. Therefore,
some changes, modifications and
improvements may not be covered in
this manual. If the operating
characteristics or the appearance of
your machine differs from those
described in this manual, please contact
your STIHL dealer or the STIHL
distributor for your area for assistance.
Safety Precautions and
Working Techniques
Because a hedge trimmer is a high-speed, fastcutting power tool with
sharp cutting blades,
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
instruction manual and
the safety precautions
periodically. Careless or
improper use may cause
serious or fatal injury.
Have your STIHL dealer show you how
to operate your power tool. Observe all
applicable local safety regulations,
standards and ordinances.
WARNING
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.
WARNING
The use of this machine may be
hazardous. If the cutting tool comes in
contact with your body, it will cut you.
Use your hedge trimmer only for cutting
hedges, shrubs, scrub, bushes and
similar material.
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WARNING
Do not use it for other purposes, since
misuse may result in personal injury or
property damage, including damage to
the machine.
WARNING
Minors should never be allowed to use
this power tool. Bystanders, especially
children, and animals should not be
allowed in the area where it is in use.
WARNING
To reduce the risk of injury to bystanders
and damage to property, never let your
power tool run unattended. When it is
not in use (e.g. during a work break),
shut it off and make sure that
unauthorized persons do not use it.
Most of these safety precautions and
warnings apply to the use of all STIHL
hedge trimmers. Different models may
have different parts and controls. See
the appropriate section of your
instruction manual for a description of
the controls and the function of the parts
of your model.
Safe use of a hedge trimmer involves
1. the operator
2. the power tool
3. the use of the power tool.
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
this machine when you are fatigued.
WARNING
Be alert – if you get tired, take a break.
Tiredness may result in loss of control.
Working with any power tool can be
strenuous. If you have any condition that
might be aggravated by strenuous work,
check with your doctor before operating
this machine.
WARNING
Prolonged use of a power tool (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.
All factors which contribute to whitefinger disease are not known, but cold
weather, smoking and diseases or
physical conditions that affect blood
vessels and blood transport, as well as
high vibration levels and long periods of
exposure to vibration are mentioned as
factors in the development of whitefinger
disease. In order to reduce the risk of
whitefinger disease and carpal tunnel
syndrome, please note the following:
Most STIHL power tools are available
with an anti-vibration ("AV") system
designed to reduce the transmission of
vibrations created by the machine to the
operator's hands. An AV system is
recommended for those persons using
power tools on a regular or sustained
basis.
– Wear gloves and keep your hands
warm.
– Keep the AV system well
maintained. A power tool with loose
components or with damaged or
worn AV elements will tend to have
higher vibration levels.
– Maintain a firm grip at all times, but
do not squeeze the handles with
constant, excessive pressure. Take
frequent breaks.
All the above-mentioned precautions do
not guarantee that you will not sustain
whitefinger disease or carpal tunnel
syndrome. Therefore, continual and
regular users should closely monitor 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 a pacemaker should
consult their physician and the
pacemaker manufacturer before
operating this tool.
HL 94, HL 94 K
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Proper Clothing
WARNING
To reduce the risk of injury, the operator
should wear proper protective apparel.
WARNING
To reduce the risk of
injury to your eyes never
operate your power tool
unless wearing goggles
or properly fitted protective glasses with
adequate top and side
protection complying with
ANSI Z87 "+" (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 protective
glasses.
Wear an approved safety hard hat to
reduce the risk of injury to your head
when there is a danger of head injuries.
Power tool 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.
Be particularly alert and cautious when
wearing hearing protection because
your ability to hear warnings (shouts,
alarms, etc.) is restricted.
Always wear heavy duty
work gloves (e.g. made of
leather or other wear
resistant material) when
handling the machine
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. Wear long
pants made of heavy
material to help protect
your legs. Do not wear
shorts, sandals or go
barefoot.
Avoid loose-fitting jackets, scarfs, neckties,
jewelry, flared or cuffed
pants, unconfined long
hair or anything that
could become caught on
branches, brush or the
moving parts of the unit.
Secure hair so it is above
shoulder level.
Good footing is very
important. Wear sturdy
boots with nonslip soles.
Steel-toed safety boots
are recommended.
THE POWER TOOL
WARNING
Never modify this power tool in any way.
Only attachments supplied by STIHL or
expressly approved by STIHL for use
with the specific STIHL model are
authorized. Although certain
unauthorized attachments are useable
with STIHL power tools, their use may,
in fact, be extremely dangerous.
If this 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. Check in particular that
the fuel system is tight (no leaks) and
that the controls and safety devices are
working properly. Do not continue
operating this machine if it is damaged.
In case of doubt, have it checked by your
STIHL servicing dealer.
THE USE OF THE POWER TOOL
Transporting the Power Tool
WARNING
To reduce the risk of injury from blade
contact, never carry or transport your
power tool with the cutter blades
moving.
For illustrations and definitions of the
power tool parts see the chapter on
"Main Parts and Controls".
4
HL 94, HL 94 K
English
389BA019 KN
It 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.
WARNING
To reduce the risk of burn
injury, do not touch hot
parts of the machine and
the gear housing when
they are hot.
WARNING
Always switch off the engine and fit the
scabbard over the cutter blades before
transporting the power tool over long
distances. When transporting it in a
vehicle, properly secure it to prevent
turnover, fuel spillage and damage to
the unit.
On machines with an adjustable cutter
bar: Make sure the cutter bar is secured
in position. See chapter in instruction
manual entitled "Adjusting Cutter Bar
Angle." On machines with a transport
position: Move cutter bar to transport
position and secure.
Fuel
Your STIHL power tool uses an oil-
gasoline mixture for fuel (see the
chapter on "Fuel" of your instruction
manual).
WARNING
Gasoline is an extremely
flammable fuel. If spilled
and 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 or the power
tool. Note that combustible fuel vapor may
escape from the fuel
system.
Fueling Instructions
WARNING
To reduce the risk of serious injury from
burns, never attempt to refuel the unit
until it has been completely removed
from the operator.
WARNING
Fuel your power tool in well-ventilated
areas, outdoors. Always shut off the
engine and allow it to cool before
refueling. Gasoline vapor pressure may
build up inside the fuel tank depending
on the fuel used, the weather conditions
and the tank venting system.
In order to reduce the risk of burns and
other personal injury from escaping gas
vapor and fumes, remove the fuel filler
cap on your power tool carefully so as to
allow any pressure build-up in the tank
to release slowly. Never remove the fuel
filler cap while the 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
machine.
WARNING
Check for fuel leakage
while refueling and during
operation. If fuel leakage
is found, do not start or
run the engine until the
leak is fixed and any
spilled fuel has been
wiped away. Take care
not to get fuel on your
clothing. If this happens,
change your clothing
immediately.
WARNING
In order to reduce the risk of fuel spillage
and fire from an improperly tightened
fuel cap, correctly position and tighten
the fuel cap in the fuel tank opening.
HL 94, HL 94 K
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English
WARNING
Unit vibrations can cause
an improperly tightened
fuel filler cap to loosen or
come off and spill quantities of fuel. In order to
reduce the risk of fuel
spillage and fire, tighten
the fuel filler cap by hand
as securely as possible.
See also the "Fueling" chapter in your
Instruction Manual for additional
information.
Before Starting
WARNING
Always check your power tool for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, throttle set wheel, stop
switch and cutting tool. The throttle
trigger must move freely and always
spring back to the idle position. Never
attempt to modify the controls or safety
devices.
WARNING
Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
power tools equipped with a manual fuel
pump). Do not start the engine if there
are leaks or damage – risk of fire! Have
the machine repaired by a servicing
dealer before using it.
WARNING
Never operate your power tool if it is
damaged, improperly adjusted or
maintained, or not completely or
securely assembled.
WARNING
Check that the spark plug boot is
securely mounted on the spark plug – a
loose boot may cause arcing that could
ignite combustible fumes and cause a
fire.
Keep the handles clean and dry at all
times; it is particularly important to keep
them free of moisture, pitch, oil, grease
or resin in order for you to maintain a firm
grip and properly control your power
tool.
WARNING
The cutting tool must be properly
tightened and in safe operating
condition. Inspect for loose parts (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!
Replace damaged cutter blades before
using the power tool. Always keep
blades sharp.
STIHL recommends that you always
spray the cutter blades with STIHL resin
solvent before starting work – with the
engine stopped! You can obtain this
protective spray from your dealer. Apply
generously.
Adjust carrying harness and hand grip to
suit your size before starting work.
Starting
On machines with an adjustable cutter
bar: Secure the cutter bar in the starting
position as described in the chapter
"Starting/Stopping the Engine." If this
starting position is not the desired
cutting position, you will then need to
carefully adjust the machine to the
desired position once the engine has
returned to idle and the blades are no
longer moving.
On machines with a defined transport
position (cutter bar folded against the
drive tube): Never start the machine in
the transport position, since the blades
are not engaged in that position and you
therefore cannot visually check to see
that they will be stopped at idle when
you start to adjust the cutter bar to the
desired cutting position (where the
blades are engaged).
Start the engine at least 10 feet (3 m)
from the fueling spot, outdoors only.
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HL 94, HL 94 K
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389BA023 KN
For specific starting instructions, see the
appropriate section of your manual.
Place the power tool on firm ground or
other solid surface in an open area.
Maintain good balance and secure
footing.
WARNING
To reduce the risk of injury from blade
contact, be absolutely sure that the
cutting tool is clear of you and all other
obstructions and objects, including the
ground, because when the engine starts
at starting-throttle or with the choke knob
engaged, engine speed will be fast
enough for the clutch to engage and
move the blades on the cutting tool.
Once the engine has started,
immediately blip the throttle trigger,
which should release the starting throttle
and allow the engine to slow down to
idle.
With the engine running only at idle,
attach the power tool to the spring hook
of your harness (see appropriate
chapter of this manual).
WARNING
Your power tool is a one-person
machine. Do not allow other persons in
the general work area, even when
starting.
WARNING
To reduce the risk of injury from loss of
control, do not attempt to "drop start"
your power tool.
WARNING
When you pull the starter grip, do not
wrap the starter rope around your hand.
Do not let the grip snap back, but guide
the starter rope to rewind it properly.
Failure to follow this procedure may
result in injury to your hand or fingers
and may damage the starter
mechanism.
Important Adjustments
WARNING
To reduce the risk of personal injury
from loss of control or contact with the
running cutting tool, do not use your unit
with incorrect idle adjustment. At correct
idle speed, the cutting tool should not
move. For directions on how to adjust
idle speed, see the appropriate section
of your instruction manual.
If you cannot set the correct idle speed,
have your STIHL dealer check your
power tool and make proper
adjustments and repairs.
WARNING
This unit is equipped with an ignition
system that is normally in operational
readiness. After the stop switch is used
to stop the engine, it automatically
springs back to the "on" position. If the
engine is warm, it may be possible to
start it by simply pulling the starter rope,
with no further adjustments. To reduce
the risk of injury, be particularly alert to
keep children away from the unit.
During Operation
Holding and Controlling the Power Tool
Always hold the unit firmly with both
hands on the handles while you are
working.
Models with loop handle
0000-GXX-1677-A0
Right hand on control handle, left hand
on loop handle on drive tube, even if you
are left-handed. Wrap your fingers and
thumbs around the handles.
HL 94, HL 94 K
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English
0000-GXX-1678-A0
Models with handle hose
Right hand on control handle, left hand
on handle hose on drive tube, even if
you are left-handed. Wrap your fingers
and thumbs around the handles.
WARNING
Never attempt to operate
your power tool with one
hand. Loss of control of
the power tool resulting in
serious or fatal injury may
result. To reduce the risk
of cut injuries, keep
hands and feet away
from the cutting tool.
Never touch a moving
cutting tool with your
hand or any other part of
your body.
WARNING
Do not overreach. Keep proper footing
and balance at all times. Special care
must be taken in slippery conditions (wet
ground, snow) and in difficult, overgrown
terrain. Watch for hidden obstacles such
as tree stumps, roots and ditches to
avoid stumbling. For better footing, clear
away fallen branches, scrub and
cuttings. Be extremely cautious when
working on slopes or uneven ground.
WARNING
To reduce the risk of injury from loss of
control, never work on a ladder, in a tree
or any other insecure support. Never
hold the machine above shoulder
height.
Working Conditions
Operate and start your power tool only
outdoors in a well ventilated area.
Operate it under good visibility and
daylight conditions only. Work carefully.
WARNING
As soon as the engine is
running, this product generates toxic exhaust
fumes containing chemicals, such as unburned
hydrocarbons (including
benzene) and carbon
monoxide, that are
known to cause respiratory problems, cancer,
birth defects, or other
reproductive harm. Some
of the gases (e.g. carbon
monoxide) may be colorless and odorless. To
reduce the risk of serious
or fatal injury/illness from
inhaling toxic fumes,
never run the machine
indoors or in poorly ventilated locations.
WARNING
If the vegetation being cut or the
surrounding ground is coated with a
chemical substance (such as an active
pesticide or herbicide), read and follow
the instructions and warnings that
accompanied the substance at issue.
WARNING
Inhalation of certain dusts, especially
organic dusts such as mold or pollen,
can cause susceptible persons to have
an allergic or asthmatic reaction.
Substantial or repeated inhalation of
dust and other airborne contaminants, in
particular those with a smaller particle
size, may cause respiratory or other
illnesses. Control dust at the source
where possible. Use good work
practices, such as operating the unit so
that the wind or operating process
directs any dust raised by the power tool
away from the operator. Follow the
recommendations of
EPA/OSHA/NIOSH and occupational
and trade associations with respect to
dust ("particulate matter"). When the
inhalation of dust cannot be
substantially controlled, i.e., kept at or
near the ambient (background) level, the
operator and any bystanders should
wear a respirator approved by
NIOSH/MSHA for the type of dust
encountered.
Operating Instructions
WARNING
Do not operate your power tool using the
starting throttle lock or with the choke
knob engaged, as you do not have
control of the engine speed.
In the event of an emergency, switch off
the engine immediately – press the stop
switch.
8
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5m (17ft)
WARNING
The cutter blades continue to move for a
short period after the throttle trigger is
released (flywheel effect).
Accelerating the engine while the blades
are blocked increases the load and will
cause the clutch to slip continuously.
This may result in overheating and
damage to important components (e.g.
clutch, polymer housing components) –
which can then increase the risk of injury
from the blades moving while the engine
is idling.
WARNING
On units with an adjustable cutter bar:
To reduce the risk of injury, never touch
the blades while making adjustments.
The power tool
has a large range.
In order to reduce
the risk of
personal or even
fatal injury to
bystanders from falling objects or
inadvertent contact with the moving
cutter blades of your power tool always
keep bystanders at least 17 feet (5 m)
away when the power tool is running.
Stop the engine and cutting tool
immediately if you are approached.
Take particular care when cutting
hedges next to or against wire fences.
Do not touch the wire with the cutting
blades. When working close to the
ground, make sure that no sand, grit or
stones get between the cutter blades.
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
your power tool when cutting in areas
where the blades could contact such
objects.
WARNING
Observe the cutting blades at all times –
do not cut any areas of the hedge that
you cannot see. When cutting the top of
a taller hedge, check the other side of
the hedge frequently for bystanders,
animals and obstructions.
DANGER
Your power tool is not
insulated against electric
shock. To reduce the risk
of electrocution, never
operate this power tool in
the vicinity of any wires or
cables (power, etc.)
which may be carrying
electric current.
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.
– Replace damaged or dull cutting
tools immediately, even if they have
only superficial cracks.
WARNING
The gearbox becomes
hot during operation. To
reduce the risk of burn
injury, do not touch the
gear housing when it is
hot.
WARNING
Never modify your muffler. Any
modification could cause an increase in
heat radiation, sparks or sound level,
thereby increasing the risk of fire, burn
injury or hearing loss. You may also
permanently damage the engine. Have
your muffler serviced and repaired by
your STIHL servicing dealer only.
WARNING
Before you start work, examine the
hedge area for stones, fence wire, metal
or other solid objects which could
damage the cutter blades.
HL 94, HL 94 K
WARNING
If the cutting tool becomes clogged or
stuck, always turn off the engine and
make sure the cutting tool has stopped
before cleaning. Grass, weeds, etc.
should be cleaned off the cutting tool at
regular intervals.
WARNING
The muffler and other parts of the engine
(e.g. fins of the cylinder, spark plug)
become hot during operation and remain
hot for a while after stopping the engine.
To reduce risk of burns, do not touch the
muffler and other parts while they are
9
English
hot. Keep the area around the muffler
clean. Remove excess lubricant and all
debris such as pine needles, branches
or leaves. 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
An improperly mounted or damaged
cylinder housing or a
damaged/deformed muffler shell may
interfere with the cooling process of the
muffler. 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 muffler is furnished with a spark
arresting screen designed to reduce the
risk of fire from the emission of hot
particles. Never operate your unit with a
missing or damaged spark arresting
screen. If your gas/oil mix ratio is correct
(i.e., not too rich), this screen will
normally stay clean as a result of the
heat from the muffler 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. Some state or federal laws or
regulations may require a properly
maintained spark arrestor for certain
uses. See the "Maintenance, Repair and
Storing" section of these Safety
Precautions. Remember that the risk of
a brush or forest fire is greater in hot or
dry conditions.
WARNING
Some STIHL power tools
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 when using a
catalytic converter,
always set your power
tool 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.
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. Start and run the engine briefly
so that the solvent is evenly distributed.
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 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.
WARNING
Use only identical STIHL replacement
parts for maintenance and repair. Use of
non-STIHL parts may cause serious or
fatal injury.
Strictly follow the maintenance and
repair instructions in the appropriate
section of your instruction manual.
Please also refer to the maintenance
chart in this manual.
WARNING
Always stop the engine and make sure
that the cutting blades are stopped
before doing any maintenance or repair
work or cleaning the power tool. Do not
attempt any maintenance or repair work
not described in your instruction manual.
Have such work performed by your
STIHL servicing dealer only.
Wear gloves when handling or
performing maintenance on blades.
WARNING
Use the specified spark plug and make
sure it and the ignition lead are always
clean and in good condition. Always
press spark plug boot snugly onto spark
plug terminal of the proper size. (Note: If
terminal has detachable SAE adapter
nut, it must be securely attached.) A
loose connection between spark plug
terminal and the ignition wire connector
10
HL 94, HL 94 K
English
in the boot may create arcing that could
ignite combustible fumes and cause a
fire.
WARNING
Never test the ignition system with the
ignition wire boot removed from the
spark plug or with a removed spark plug,
since uncontained sparking may cause
a fire.
WARNING
Do not operate your power tool if the
muffler is damaged, missing or modified.
An improperly maintained muffler will
increase the risk of fire and hearing loss.
Your muffler is equipped with a sparkarresting screen to reduce the risk of
fire; never operate your power tool if the
screen is missing, damaged or clogged.
Remember that the risk of a brush or
forest fire is greater in hot or dry
weather.
In California, it is a violation of § 4442 or
§ 4443 of the Public Resources Code to
use or operate gasoline-powered tools
on forest-covered, brush-covered or
grass-covered land unless the engine’s
exhaust system is equipped with a
complying spark arrester that is
maintained in effective working order.
The owner/operator of this product is
responsible for properly maintaining the
spark arrester. Other states or
governmental entities/agencies, such as
the U.S. Forest Service, may have
similar requirements. Contact your local
fire agency or forest service for the laws
or regulations relating to fire protection
requirements.
WARNING
Never repair damaged cutting attachments by welding, straightening or
modifying the shape. This may cause
parts of the cutting blades to come off
and result in serious or fatal injuries.
Keep the cutting blades sharp. Tighten
all nuts, bolts and screws, except the
carburetor adjustment screws, after
each use.
Do not clean your machine with a
pressure washer. The solid jet of water
may damage parts of the machine.
Store the power tool 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. See
chapter "Storing the machine" in this
manual.
Using the Unit
Cutting Season
Observe country-specific or municipal
rules and regulations for cutting hedges.
Do not use your hedge trimmer during
rest periods customary in the
neighborhood.
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.
Disposal
Do not throw cuttings into the garbage
can – they can be composted.
Preparations
N Model with adjustable cutter bar:
Set the cutter bar to the straight (0°)
position.
N Remove the blade scabbard.
N Start the engine.
N If you use a harness: Put on the
harness and attach it to the
machine.
HL 94, HL 94 K
11
English
388BA029 KN
388BA030 KN
389BA050 KN
Working Technique
Horizontal Cut (with cutter bar at an
angle)
Cutting close to the ground from a
standing position, 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.
Vertical Cut (with cutter bar at an angle)
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.
Vertical Cut (with straight cutter bar)
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.
WARNING
The K version (HL 94 K) is not approved
for cutting close to the ground.
12
HL 94, HL 94 K
English
388BA031 KN
388BA032 KN
388BA033 KN
Overhead Cut (with cutter bar at an
angle)
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 adjustable
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.
Horizontal Cut (with straight cutter bar)
Hold the cutter bar at an angle of 0° to
10° as you swing the hedge trimmer
horizontally.
Swing the cutter bar in an arc towards
the outside of the hedge so that the
cuttings are swept to the ground.
Recommendation: Only cut hedges that
are no more than chest high.
HL 94, HL 94 K
13
English
Approved Power Tool
Attachments
The following STIHL attachments may
be used with the basic power tool:
Attachment
HL 0°, 500 mm
HL 0°, 600 mm
HL 145°,
500 mm
HL 145°,
600 mm
HT
BF
KB (4601)
KW (4601)
1)
2)
3)
1)
1)
2)
2) 3)
2) 3)
2) 3)
Loop handle required on versions
with long drive tube (HL 94)
Not approved for versions with
short drive tube (HL 94 K)
Loop handle required
Application
1)
Long reach hedge
trimmer
1)
Long reach hedge
trimmer
Long reach hedge
trimmer
Long reach hedge
trimmer
Pole saw
Cultivator with pick
tines
Bristle brush
PowerSweep
Assembling the Unit
Mounting the Loop Handle (HL 94)
Loop handle is required on versions with
long drive tube (HL 94).
7
7
8
8
2
3
1
5
6
9
4
9
N 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).
N Position the clamp (6) against the
shaft.
N Line up the holes.
N Insert the screws (7) with
washers (8).
N Fit the square nuts (9) and screws.
A
2
0000-GXX-1680-A0
N Align the loop handle (2) and move
it to the most comfortable position
(recommended: about 20 cm/8 in).
N Tighten down the screws firmly.
0000-GXX-1679-A0
14
HL 94, HL 94 K
English
Mounting the Gearbox
11
10
10
5
N Loosen the clamp screws (10).
N Push the gearbox (11) onto the
drive tube (5), turn the gearbox (11)
back and forth as necessary.
11
12
Once the end of the drive tube is
0000-GXX-1681-A0
inserted beyond the slot in the
clamp (12):
N Push the gearbox (11) fully home as
far as stop.
N Tighten down the clamp screws
moderately.
N Line up the gearbox (11) with the
powerhead.
N Tighten down the clamp screws
firmly.
Fuel
This engine is certified to operate on
unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
NOTICE
Fuel with an octane rating below 89 may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
0000-GXX-1682-A0
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 and
catalytic converters as well. This could
cause running problems or damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline!
NOTICE
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects
engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.
HL 94, HL 94 K
15
English
WARNING
To reduce the risk of personal injury
from loss of control and/or contact with
the running cutting tool, do not use your
unit with an incorrect idle adjustment. At
correct idle speed, the cutting tool
should not move.
If your machine’s idle speed is
incorrectly adjusted, have your
authorized STIHL servicing dealer
check your machine and make the
proper adjustments and repairs.
The idle speed and maximum speed of
the engine change if you switch from a
fuel with a certain ethanol content to a
fuel with a much higher or lower ethanol
content.
This problem can be avoided by always
using fuel with the same ethanol
content.
To ensure the maximum performance of
your STIHL engine, use a high quality 2cycle engine oil. To help your engine run
cleaner and reduce harmful carbon
deposits, STIHL recommends using
STIHL HP Ultra 2-cycle engine oil or ask
your dealer for an equivalent fully
synthetic 2-cycle engine oil.
To meet the requirements of EPA and
CARB we recommend to use STIHL HP
Ultra oil.
STIHL MotoMix
STIHL recommends the use of STIHL
MotoMix. STIHL MotoMix has a high
octane rating and ensures that you
always use the right gasoline/oil mix
ratio.
STIHL MotoMix uses STIHL HP Ultra
two-stroke engine oil suited for high
performance engines.
For further details, see
www.STIHLusa.com/ethanol
If not using MotoMix, use only STIHL
two-stroke engine oil or equivalent highquality two-stroke engine oils that are
designed for use in air cooled two-cycle
engines.
The use of non-seasonal gasoline
blends may increase the potential for
pressure to build in the fuel tank during
operation. For example, using a winter
blend during the summer will increase
pressure in the fuel tank. Always use
gasoline blends appropriate to the
season, altitude and other
environmental factors.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other
mix oils that state they are for use in both
water cooled and air cooled engines
(e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
WARNING
Take care when handling gasoline.
Avoid direct contact with the skin and
avoid inhaling fuel vapor. When filling at
the pump, first remove the container
from your vehicle and place the
container on the ground before filling. To
reduce the risk of sparks from static
discharge and resulting fire and/or
explosion, do not fill fuel containers that
are sitting in or on a vehicle or trailer.
The container should be kept tightly
closed in order to limit the amount of
moisture that gets into the mixture.
The machine‘s fuel tank should be
cleaned as necessary.
Fuel mix ages
If not using MotoMix, only mix sufficient
fuel for a few days of work, not to exceed
30 days of storage. Store in approved
fuel-containers only. When mixing, pour
oil into the container first, and then add
gasoline. Close the container and shake
it vigorously by hand to ensure proper
mix of oil and gasoline.
Gasoline
US gal. US fl.oz.
12.6
2 1/2 6.4
5 12.8
Dispose of empty mixing-oil containers
only at authorized disposal locations.
Oil (STIHL 50:1 or equivalent high-quality oils)
16
HL 94, HL 94 K
English
0208BA019 KN
0208BA020 KN
0208BA021 KN
0000-GXX-1683-A0
145°
Fueling
Preparations
WARNING
When fueling on a slope, always position
the machine so that the filler cap is
facing uphill.
N On level ground, position the
machine so that the filler cap is
facing up.
N 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.
WARNING
To reduce the risk of fire and personal
injuries due to escaping fuel and vapor,
remove the fuel filler cap carefully so
that any excess pressure in the tank can
escape slowly. Use the proper seasonal
gasoline blend, i.e., winter blend in
winter, summer blend in summer.
Opening the screw cap
N Turn the cap counterclockwise until
it can be removed from the tank
opening.
N Remove the filler cap.
Refueling
Take care not to spill fuel while fueling
and do not overfill the tank.
Closing the screw cap
N Position cap.
N Turn the cap clockwise as far as it
will go and tighten it as securely as
possible by hand.
Adjusting the Cutter Bar
Angle Adjuster - 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 possible
working positions.
WARNING
To reduce the risk of injury, carry out the
adjustment 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.
HL 94, HL 94 K
17
English
0000-GXX-1686-A0
1
2
3
WARNING
To reduce the risk of injury, never touch
the blades while making adjustments.
2
3
1
N Pull back the sliding sleeve (1) and
use the lever (2) to adjust the joint
by one or several holes.
N Release the sliding sleeve (1) and
make sure the lock pin engages the
quadrant (3).
Transport Position
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-1684-A0
N Shut off the engine.
N Fit the blade scabbard.
N Pull back the sliding sleeve (1) and
use the lever (2) to swing the joint
upwards – in direction of drive tube
– until the cutter bar is flat against
the drive tube.
N Release the sliding sleeve (1) and
make sure the lock pin engages the
quadrant (3).
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
18
0000-GXX-1685-A0
HL 94, HL 94 K
English
1
388BA037 KN
3
1
002BA308 KN
2
1
2
1
002BA310 KN
2
1
2
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.
Shoulder Strap
Attaching Machine to Shoulder Strap
N Attach the carabiner (1) to the
carrying ring (2) on the drive tube –
hold the carrying ring steady.
Disconnecting Machine from Shoulder
Strap
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 slipping the strap off your
shoulder.
N Put on the shoulder strap (1).
N Adjust the length of the strap.
N With the power tool attached, the
carabiner (3) must be at about the
same height as your right hip.
HL 94, HL 94 K
N Press down the bar on the
carabiner (1) and pull the carrying
ring (2) out of the carabiner.
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.
19
English
0208BA066 KN
2
1
4
3
0208BA067 KN
4
5
0208BA029 KN
2.
1.
0208BA030 KN
6
Starting / Stopping the
Engine
Controls
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".
Function of stop switch and ignition
system
The ignition is switched off and the
engine stopped when the stop switch is
pressed. The stop switch returns
automatically to the Run position when it
20
is released: The ignition is switched on
again after the engine stops – the engine
is then ready to start.
Function of throttle set wheel
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 unaffected. The
original setting is restored when the
throttle trigger is released.
Starting the Engine
N Press the manual fuel pump
bulb (5) at least five times – even if
the bulb is already filled with fuel.
Cold engine (cold start)
N Turn choke knob (6) and then push
it in at g
Also use this setting if the engine has
been running but is still cold.
– Turn throttle set wheel in direction of
+ as far as stop.
Hot engine (hot start)
N Choke knob (6) remains in F
position.
HL 94, HL 94 K
Cranking
1191BA014 KN
1191BA015 KN
1191BA025 KN
English
N Place the unit on the ground: It must
rest securely on the engine support
and the gearbox housing.
N On units with an adjustable cutter
bar and defined transport position:
Set the cutter bar to the straight (0°)
position.
N If fitted: Remove blade scabbard
from the cutting blades.
To reduce the risk of accidents, check
that the cutting blades are not touching
the ground of any other obstacles.
N Make sure you have a firm footing,
either standing, stooping or
kneeling.
N Hold the unit firmly on the ground
with your left hand and press down
– do not touch the throttle trigger,
lockout lever or stop switch.
NOTICE
Do not stand or kneel on the drive tube.
N Hold the starter grip with your right
hand.
N Pull the starter grip slowly 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.
N Continue cranking until the engine
runs.
As soon as the engine runs
At temperatures below +10 °C (+50 °F)
Warm up the engine for at least
10 seconds in position g.
At temperatures above +10 °C (+50°F)
Warm up the engine for at least
5 seconds in position g.
N Depress throttle trigger lockout and
pull the throttle trigger – the choke
knob moves to the Run F position.
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.
Stopping the Engine
N Depress the momentary contact
stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Other Hints on Starting
Engine stalls in cold start position g.
N Depress throttle trigger lockout and
pull the throttle trigger – the choke
knob moves to the Run F position.
N Continue cranking in position F until
the engine runs.
HL 94, HL 94 K
21
English
0208BA034 KN
1
0208BA035 KN
5
4
Running engine stalls in cold start
position g or under acceleration.
N Continue cranking in position F until
the engine runs.
If the engine does not start
N Check that all settings are correct.
N Check that there is fuel in the tank
and refuel if necessary.
N Check that the spark plug boot is
properly connected.
N Repeat the starting procedure.
Engine is flooded
N Move the choke knob to F and
continue cranking until the engine
runs.
Fuel tank run until completely dry
N After refueling, press the manual
fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
N Set the choke knob according to
engine temperature.
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
If there is a noticeable loss of engine
power
N Set knob for warm start (1) to g
N Turn screw (2) in filter cover (3)
counterclockwise until the cover is
loose
N Remove filter cover (3)
N Clean away loose dirt from around
the filter
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".
N Grip into the recess (4) in the filter
housing and remove the felt filter (5)
N Replace felt filter (5) – as a
temporary measure you can knock it
out on the palm of you hand or blow
it out with compressed air – do not
wash
22
HL 94, HL 94 K
English
0208BA036 KN
NOTICE
Replace any damaged parts!
N Insert felt filter (5) form-fittingly into
the filter housing
N Set knob for warm start (1) to g
N Fit filter cover (3) – make sure not to
tilt the screw (2) – insert screw and
tighten
Engine Management Adjusting the Carburetor
Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
The carburetor of the machine has been
adjusted at the factory for optimum
performance and fuel efficiency in all
operating states.
Setting the idle speed
Engine stops when idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Cutting blades move when idling
N Turn the idle speed adjusting
screw (LA) slowly counterclockwise
until the cutting blades stop moving
HL 94, HL 94 K
WARNING
If the cutting blades continue to move in
idle even after adjustment, have the
machine repaired by a STIHL servicing
dealer.
23
English
1
0208BA037 KN
2
3
0208BA038 KN
000BA039 KN
A
2
1
0000-GXX-1831-A0
3
Spark Plug
If the engine is down on power, difficult
to start or runs poorly at idling speed,
first check the spark plug.
Install a new spark plug after approx.
100 operating hours or earlier if the
electrodes are badly eroded/corroded.
The wrong fuel mix (too much engine oil
in the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may degrade performance.
Removing the spark plug
N Turn screw (1) in cap (2) until cap
can be removed
N Lay down cap
24
N Unplug spark plug boot (3)
N Unscrew spark plug
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see chapter
"Specifications."
N Use only resistor type spark plugs of
the approved range.
Rectify problems which have caused
fouling of spark plug:
– too much oil in fuel mix,
– dirty air filter,
– unfavorable running conditions, e.g.
operating at part load.
WARNING
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press the spark plug
boot (1) snugly onto the spark plug
terminal (2).
Do not use a spark plug with a
detachable SAE adapter terminal (3).
Arcing may occur that could ignite
combustible fumes and cause a fire.
This can result in serious injuries or
damage to property.
N Only use resistor type spark plugs
with solid, non-threaded terminals
Installing the Spark Plug
N Fit the spark plug and tighten it
down firmly.
N Press the boot firmly onto the spark
plug.
HL 94, HL 94 K
English
1
2
0208BA039 KN
1
0000-GXX-1687-A0
1
0000-GXX-1688-A0
N Fit the cap (1), insert the screw (2)
and tighten it down firmly.
Lubricating the Gearbox
Blade Drive Gear
Lubricate the blade drive gear with
STIHL gear lubricant for hedge trimmers
– see "Special Accessories".
HL 0° version
Adjustable HL 145° version
plug (1) – if no grease can be seen
on the inside of the filler plug, screw
the tube of grease into the filler hole.
N Squeeze up to 10 g (2/5 oz) grease
into the gearbox.
NOTICE
Do not completely fill the gearbox with
grease.
N Unscrew the tube of grease from the
filler hole.
N Refit the filler plug and tighten it
down firmly.
Angle Drive Gear
Lubricate the angle drive gear with
STIHL gear lubricant for hedge trimmers
(special accessory).
Adjustable HL 145° version
HL 94, HL 94 K
2
0000-GXX-1689-A0
N Check the lubricant level at regular
intervals of about every 25 hours of
operation. Unscrew the filler
N 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.
N Squeeze up to 5 g (1/5 oz) grease
into the gearbox.
25
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