Stihl HL 90 Bedienungsanleitung

Instruction Manual

Manual de instrucciones

Warning!

Read and follow all safety precautions in

Instruction Manual – improper use can cause

serious or fatal injury.

Advertencia!

Lea y siga todas las precauciones de

seguridad dadas en el manual de

instrucciones – el uso incorrecto puede

causar lesiones graves o mortales.

STIH)

STIHL HL 90

BA_U1_86_02.fm Seite 0 Mittwoch, 18. April 2007 1:20 13

1HL 90 K

English / USA

BA_SE_212_003_01_03.fmPrinted on chlorine-free paper.

Printing inks contain vegetable oils; paper can be recycled.

0458 445 8621 A. M1. C8. PM. Printed in USA

STIHl

Contents

Guide to Using this Manual .............. 2

Safety Precautions and

Working Techniques ......................... 3

Using the Hedge Trimmer .............. 13

Mounting the Gearbox .................... 14

Adjusting the Throttle Cable ........... 15

4-MIX Engine .................................. 16

Fuel ................................................ 16

Fueling ............................................ 17

Starting / Stopping

the Engine ...................................... 18

Operating Instructions .................... 21

Cleaning the Air Filter ..................... 21

Motor Management ........................ 21

Adjusting the Carburetor ................ 22

Spark Arresting Screen in Muffler ... 23

Checking the Spark Plug ................ 24

Lubricating the Gearbox ................. 25

Replacing Starter Rope

and Rewind Spring ......................... 26

Storing the Machine ........................ 29

Sharpening Instructions .................. 29

Inspections and Maintenance

by Dealer ........................................ 29

Maintenance Chart ......................... 30

Main Parts and Controls ................. 32

Specifications ................................. 34

Special Accessories ....................... 35

Maintenance and Repairs ............... 35

STIHL Incorporated

Federal Emission Control

Warranty Statement ........................ 36

STIHL Incorporated California

Exhaust and Evaporative Emissions

Control Warranty Statement ........... 38

Trademarks .................................... 40

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 improve-

ments 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.

English / USA

HL 90 K

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:

:A bullet marks a step or procedure

without direct reference to an

illustration.

A description of a step or procedure that

refers directly to an illustration may

contain 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.

Caution where there is a risk of

damaging the machine or its

individual components.

Note or hint which is not essential

for using the machine, but may

improve the operator’s under-

standing 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 may refer to

several models with different

features. Components that are not

installed on all models and related

applications are marked with an

asterisk (*). Such components may

be 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 some changes, modifications

and improvements may not be covered

in this manual.

Guide to Using this Manual

3HL 90 K

English / USA

Because a hedge trimmer

is a high-speed, fast-

cutting 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. It must not be used for

any other purposes, since such misuse

may result in an accident or 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.

Safety Precautions and

Working Techniques

English / USA

HL 90 K

!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 white-

finger 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 buffers 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.

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

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 protective glasses.

!Warning!

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.

5HL 90 K

English / USA

Always wear gloves 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.

Wear an approved safety

hard hat to reduce the risk

of injury to your head

when there is a danger of

head injuries.

THE POWER TOOL

For illustrations and definitions of the

power tool parts see the chapter on

“Main Parts and Controls”.

!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.

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!

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.

002BA247 KN

English / USA

HL 90 K

Fuel

Your STIHL power tool uses an oil-

gasoline mixture for fuel (see the chap-

ter 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!

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.

Different models may be equipped with

different fuel caps.

Cap with grip

!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.

To do this with this STIHL

cap, raise the grip on the

top of the cap until it is

upright at a 90° angle.

Insert the cap in the fuel

tank opening with the

triangular marks on the grip of the cap

and on the fuel tank opening lining up.

Using the grip, turn the cap firmly

clockwise as far as it will go (approx. a

quarter turn).

Fold the grip flush with the

top of the cap. If the grip

does not lie completely

flush with the cap and the

detent on the grip does

not fit in the

corresponding recess in the filler neck,

the cap is not properly seated and

tightened and you must repeat the

above steps.

7HL 90 K

English / USA

Screw cap

!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.

Before Starting

!Warning!

Always check your power tool for proper

condition and operation before starting,

particularly the throttle trigger, throttle

trigger interlock, stop switch and cutting

tool. The throttle trigger (if applicable)

must move freely and always spring

back to the idle position. Never attempt

to modify the controls or safety devices.

!Warning!

Never use a power tool that is damaged

or not properly maintained.

!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.

Starting

Start the engine at least 10 feet

(3 meters) from the fueling spot,

outdoors only.

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, engine speed will be

fast enough for the clutch to engage and

move the blades on the cutting tool.

002BA245 KN

English / USA

HL 90 K

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.

!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.

During Operation

Holding and controlling the power

tool

Always hold the unit firmly with both

hands on the handles while you are

working. Wrap your fingers and thumbs

around the handles.

Place your left hand on hose grip of shaft

and your right hand on rear grip and

throttle trigger. This also applies to left-

handers.

!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.

002BA246 KN

9HL 90 K

English / USA

!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.

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