Stihl 090 User manual

Congratulationsl

You

are

the

owner

of a

precision-manufactured

STlHL

chain

saw

designed

to

give

you

long

and

dependable

service.

To

receive

maximum

performance

and

satisfaction

from

your

STlHL

chain

saw,

it

is

important

that

you

read

and

understand

the

maintenance

and

safety

precautions

before

using

your

saw.

Contact

your

STlHL

Dealer

or

the

SllHL

Distributor

for

your

area

if

you

do

not

understand

any

of

the

instructions

or

warnings

in

this

Manual.

This

Manual

contains

warnings

regarding

your

saw,

operating

and

safety

instructions for all

STlHL

090

series

power

saws.

WarningI

Because

a

chain

saw

is

a

high-speed

wood-cutting

tool,

some

special

safety

precautions

must

be

observed

as

with

any

other

power

saw

to

reduce

the

risk of

personal

acci-

dents.

Careless

or

improper

use

may

cause

serious

or

even

fatal

injury.

It

is

important

that

you

fully

understand

'the

contents

of

this

Manual

and

that

you

allow

only

persons

who

understand

this

Manual

to

operate

your

chain

saw.

Pay

special

attention

to

the

safety

precautions

and

cutting

techniques

outlined

on

pages

4

to

19.

STIHL!s

philosophy

Is

to

continually

improve

all

of its pro-

ducts.

As

a

result,

engineering

changes

and

improvements

are

made

from

time-to-time.

Written

notices

relating

to

such

changes

are

sent

to

STIHL

Dealers.

Ifthe

operating

characteristics

of

the

appearance

ofyour

saw

differs

from

those

described

in

this

Manual,

please

contact

your

local

STlHL

Dealer

for

updated

information

and

assistance.

0458

166

0121.

MO,7S.AO.1:

Printed In

West

Germany x

8nHL

090,

090

AY,

090

G

InstructionManual/Owner'sManuals, .

Sharpeningand Maintenance

of

SawChains

Contents

Parts of

the

Chain

Saw

Satety

Precautions

-

The

Operator

-The

Saw

-

The

Use

of

the

Saw

-

Maintaining

and

Storing

the

Saw

Mounting

Guide

Bar

and

Chain

Fuel

Chain

Oil

Helpers

Handle

Starting

011

Quantity

Control

Cutting

Attachment

Air

Filter

Carburetor

.

Replacing

the

Chain

Sprocket

Gear

Lubricant

090 G

Rewind

Starter

Maintenance

Chart

Specifications

Sharpening

and

Maintenance

of

Saw

Chain

STIHL~

C

1990

Andreas

Stlhl,

Walblingen

Andreas Stihl

D-7050W8lblingen

2

4

6

19

20

22

23

24

27

28

30

31

32

33

34

36

37

39

1

Parts

of

the

Chain Saw

4 Front hand Guide

5 Front handle bar nose 3

6 tenninal Guide

bar

2

of filter cover

Bumper spike

13

9 Clutch

l'

O'lain catcher 15

Oil

hand

Chain

16

12

Oil

22 Chain

23

Choke lever

18

throttle lock

19

25 Slarter throttle lock

20

2

Defil1llfOns

1.

Oilo~

Saw

Chain. A

J09P

~

of

cutters.

tie straps

~drive

links.

.

','

~,.-

2. Guide Bar.

Su_~:ijuJdes

the

saw

chain.

.

";.,:

)"'~:

~:/r~

3. Gu

..

~rNose.:~~,paitoftheguidebar.

4.

~

~auarii.-~.::\~

afnst

ro..

~

.,."

PI,

ag P

jecting

~fInd

helps preventthe left

hand

from

touchi

ttcEt

Ch8tn

if

It

slipsoff

the

handle bar•

•

0<

,.:,._.,..J!~t

",,-of

..

'

',',

',,,,,

, ,

5.

FrontHandle.

Handle

bar

for

the left

hand

atfront

of

saw.

6.

Sp;idc

Plug

TemdnaL Connects the spark

plug

with

1he

i9nHiOn

Wire.

7.

Lock'or-Filter

Cover. For

remoVing

filter cover, per-

rnitS1Uter

to.be

cIearied.:

8.

,

Rear'Handle-The

Support

handJe

forthe right hand,

. Iocited at

or

tOward

the

rear

of

the

saw.

9.

Oil

Fftier

~For

closing

the

011

tank.

10.

Stop

Switch. Switches

the

engine's

ignition

system

off

and

stops the

running

of

the

engine.

11.

Oil Hand Pump.

For

additional

manual

c::;haln

lubri-

cation..

12.

011

Inspection

WIiu:Iow.

For

contrO'mng

the

chain

011

level.

13. BUmper

~

Toothed

stop

for

holding

saw

steady

againSt

wood.

14.

ClUtch.

C()upJes

engine

to

chain sprocket

when

engine

is accelerated beyond Idle

speed.

15.

Chain

Catcher. Catches a broken chain

and

guides

Itinside

the

chain

sprocket COVet

""~~~~\'

16.

cta8fr.

8prf;K=ket.

The toothed wheel that drives the

sawctUll~

.

17.

Chain.Sprock8t

Cover. Covers the clutch and the

sproClCet.

18.

Choke

Lever.

Eases engine starting

by

enriching

~ixlure.

19.

StartfngThrottle Lock.

Keeps

the throttle partualJy

~n

~ring

starting.

20.

~

Throttle

Look.

Must

be

depressed before

~

the

throttle

trigger.

21.

Throttle

TrIgger. Controls

the

speed ofthe

engine.

22. ChaInGuard(Scabbard). Protects

the

operator

from

touchil1$1

the

chain.

23. DecompfessionValve. Makesstarting easier.

24.

Muffler.

Attenuates

exhaust noises

and

diverts ex-

haust

gases

i~,

req~lreQ

~on.

25.

Starter

~'The,

grip

Of

the,

pull

,starter.

which is

the

device

to

start the engine.

26.

Fuel

FlUer

Cap.

For

closing

the

fuel tank.

3

Safety Precautions

The

use

ofanychain sawmay

be

hazardous.

The

saw

chain

has

large,

sharp cutters. If the cutters contact your

flesh,

they

will

cut

you,

ewn

Hthe

chain,

is not

m9VIns.'

At

full

throttle, the chain

speed

can

reach

45

mph

'(20

ri1Is).

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.

Pay

special attention to the section

on

reactive

forces,

pages

10

to 13.

Warning!

Reactive

forces,

including

kickback,

can

be

dangerous.

Careless or improper use of any chain

saw

may

cause

seriousorfatallnjuiy. . ' , .

All

safety precautions that are generally

observed

when

workingwith Bnaxeora'hand

saW

aisoapply

~

the'opefa-

lion

of

chain

saws.

HOWever;

beCause

'8

Chain

saw

is a

hlghspeed,

fast cutting power

tool,~a1

safety

pre-

cautions

mustbe

obSerVed

to

reduce

,tti~~

risk of

personal

accidents. .-.

Have

your

,STIHL

dealer

show

you

how

to operate

your

chain

saw.

ObserVe

all

appllCabra'~

safetY

'regulations,

standards

and

ordinances.

,Warning!

4 Minors should never

be

allowed

to

use

a

chain

saw.

2

Bystanders,

espedallychildren

and

anim~s

should

.not

be

allowed in the area where a chain saw is

in

use

(ill.

1).

Neverletlt\esaw

run

unattended.

$.Ore

itina

locked

place

away

from

'Children

and

empty

the fuel

tank

before

stonng

for longerthan afew

days.

. .

Do

not

lend

Y'0ur

chain saw without the Owner's

Manual.

Be

sure

that

'anyone'

'using

,yO~'saw

understands

the

information contained in this Manual.

Thesesafetyprecautions

and

waqlingsapply

to

the

use

of

all

STlHL

~n

saws.

Different

~odc$

may

have

~erent

parts

and

controls. See the 'appropriate section of your

Owner's

Manual for a description of the controls

and

function of

the'

p8rts

ofyour model

saw.

Safe

use

ofa chain

SaW

involves

t the operator

2. the saw

3. the

uSe

ofthe

saw.

THE

OPERATOR

Physical

Condition

You

must

be

in good physical condition and

mental

health

and

not under the influence of

any

substance

(drugs,

alcohol),

which might impairvision, dexterity

or

judgment.

Do

not

operate a chain saw when

you

are fatigued

(UI.

2).

Be

alert

.:..

H

you

'get tired while

operating

yOlir ctiain

saw,

take.

a

~r~ak.

tiredness

may

result

,in

.1oSs~f

co~.

Working

vVith

aity,chaiO

saw.

can

De

'Strenu()us.

If

you

have

any

.

conditiOn

tfiat

inight

..

be

aggravated by 'strenuous

work.

check

with

yourdoctor

befOre

operating achain

saw.

~!

PtoIonged.~

ofcl1ain saws (orother

m~ines)

exposing

the

operator to vibrations may produce Whitefinger dis-

ease

(Raynaud's phenomenon). This phenomenon redu-

ces

the hand's ability to

feel.

and regulate temperature,

produces

numbness andburriing sensations

and

may

•

cause

nerve

and

circulation damage

and

tissue necrosis.

MinySTIHL

models

are'

available with

an

anti-vibration

system

designed to reduce engine 'vibration.

An

anti-

vibration system is recommended for those using chain

saws

on

aregular orsustained basis.

Heated

handles help to reduce the risk of Whit8finger

diseaseand

are

recommended forcold weather

use.

Most

STlHL

Powerheads

are availablewith heated handles.

Anti-vibration

sYstems

and

he~ecI

handles do not gua-

rantee

that

you

will not,sustainWhitefinger

d"lS8ase~

There-

fore continual

and

regular users'should 'monitor clOsely

.their

use

ofchain saws

and

theirphysical condition.

ProperClothing .

'.

CIOthil1Q

'musfbe stUrdy

and

snug-fitting. but allow

c0m-

plete

fieedom

of'

movement.

AvOId

Ioose-fitting jackets,

~

~.jeweirY.

~

or~

pants,

or

anYthing

thatcould

become

entangled

with the

saw

orbrush. Wear

ove~~

o~

jeans

with'

a reinforced

cutting

resistant insert

(Ill

3). , . .

p.

your hands with gloves when handling saw

and

saW

chain.

Heavy-duty, nonslip gloves improve your grip

and

protectyour

hands.

Good

footing is most Important

in

chain

saw work.

Wear

sturdy boots

with

nonslip soles. Steel-toed safety boots

are

recommended.

. ,"

>.

Proper

eye

protection

Is

a must. Non-fogging, vented

goggles or a.face screen is recommended. Their use

reducesthe risk ofeye

injury.

" "

Wear

an

approved safety

hard

hat

to

protect your

head.

Chain

saw

noisemaydarriage your hearing. Always wear

sound barriers (ear plugs

or

earmuffters)

to

protect your

hearing.

Continual

and regular users should have ·their hearing

checked

regularty.

5

4

THE

SAW

Parts

of

the

chain

saw;

Illustrations

and

definitions

of the

parts

see

pages

2 and

31

~I

NevermodHy a

chain

saw

in

any

way.

Only

attachments

supplied

by

STlHL

or expressly

appro~,!)y

STlHL

,for

use

with

the

specific

STlHL

saw

modelS

,are.

authorized.

Although

certain

unauthorized

attachmentsaie

useable

with

the

STlHL

powerhead.

their

use

may,

in

fact,

.be

extremely dangerous. '

THE

USE

OF

THESAW

TranSportingthe

chain

saw

W8ming!

AJW8yS

Stop

the

enQtne

before'pUtting

a

chain

saw

down or

carryi~

~.

~

.chain'

sti~;with

~'

engine

running

is extteinely

dangerous.

'A'CCidentaJ

acceleration

of the

engine

eancsuse

the

chain to

rotate.

Avoid

touchmg

the

hotmUffter.' .

.~

.

6

By

hand:

When

carrying

your

saw

by

hand,

the

'engine

must

be

stopped

and

the

saw

must

be

in

the

proper

position.

Grip

~e

front

handle

and

place

themuffleratthe

'side

away

from

the

body

(i1l.4).

" .

1tl8'

c;hafn

-guard

(scabbard)

~Uld

tie

over

the

chain

and

the

gu~

barWhfCh

~rd

P9fljt

b8ckwards.

When

carrying

your

~

barsttouldbebehind

you

(i1l.4).

By

vehicle: When transporting in a

vehicle,

keep

chain

EiI19

bar,

~v~red

with the

ch~n.guard.,

Properly

,secure

your

saw

to

prevent

turnover,

fuel

SpHlage

and

damage

to

the

saW.

" .

Prepaf8tion

forihe

use

of

the

saw

T~

offthe

chain

guard

and

inspectforsafetyin

operation.

For

assemblY

please

foUow

~

procedure described at

the

appropriate

section "Mounting

the

Bar

and

Chafn" of

yourowner's

Manual.

'

STlHb-Oilornatic

chain,

guide

bar

and

sprocket

must

match

eaCh

other:'

' " .

."

If

the,

g~i48

~r

'or chain Is

~1aC8dt

it

must

be

with

a bar

or

Ch8In

ofthe

same

type.

ReplaCement

with

another

type

of

guide baror

chain

'wiD

seriously

increase

the

00,ances

,of

ope~

iF.ljury

~ue

t()

the

Contact

of

the

'moving

chain

with

.~

operator

during

n;rtational

kicIcb8ck.

W8rnirig!

Proper

tension

of

the

chain is extremely important. In order

to

av~

~

.setting the

tensiol1ing

~we

must

'be

fot~

as,

d~

in

Y9ur

~"'M~,~ys

~re

~h,e*agoraarn~s>'fotthesp~coveriS(~)~

seCuteJy

after

tensioning,

~e

.chaffL

CheCk

Chain

t~n

once'~

after

t:taving.

tigtlte.ned

the

n~

and thereafter

at

regular

intervals

(Whenever

the

saw

is

shut

off).

If

the

chain

becomes loosewhile cutting,

shut

offthe

engine

and

then

tighten.

Nevertry to tighten thechain

while

theengine

is runningl

5

Fueling

-

Your

STlHL

chain

saw

uses

an

oll-gasoline mixture for

fuel

(seechapter"

Fuel

n ofyour

Owner's

Manual).

Warning!

Gasoline

is

an

extremely

flammable

fuel.

Use

extreme

caution

when

handling

gasoline or

fuel

mix.

Do

not

smoke

or

bring

any

fire

or

flame nearthe

fuel

(ill. 5).

Fueling

Instructions

Fuel

your

Chain

saw

in well-ventilated

areas,

outdoors

only.

Always

shut off the

engine

and

allow

It to

cool

before

refueling.

Relieve

fuel

tank

pressure

by

loosening

fuel

cap

slowly.

Select

bare

ground

for fueling

and

move

at

least

10

feet

(3

m)

from

fueling spotbefore starting the

~ngine.

Wipe

off

any

spilled

fuel

before

starting your

saw

and

check

for

leakage.

Check

for

fuel

leakage

while

refueling

and

during

operation.

If

fuel

or

011

leakage

is

found,

donotstart or

run

the

engine

until

leak

is

fixed

and

spilled fuel

has

been

wiped

away.

6

Starting

Wamlng!

Your

chain

saw

is

a one-person

saw.

Do

not

allow

other

persons

to

be

near

the

chain

saw.

Start

and

operate

your

saw

without

assistance.

.

For

safe

and

specific starting Instructions.

see

the

appro-

priate

section

ofthe

Owner's

Manual.

Do

not

drop

start.

This

method

is

very dangerous

because

YC?':I

maY.lose

control ofthe

saw

(ill. 6).

Place

the

chain

saw

on

finn

ground

orothersolidsurface

in

an

open

area.

Maintain

a

good

balance

and

secure

footing.

Beabsolutely

sure

thatguidebar

and

chainareclearof

you

and

all

other obstructions

and

objects,

including

the

ground:

because

when

the

engine starts

at

starting-

throttl~,

engine

speed

will be fast

enough

fOr

the

clutch to

engage

sprocket

and

tum the

chain,

which

may

cause

kickback

to

occur.

Engage

the

chain

brake

when

starting a

QuiclCstop

model.

(see

chapter

"Chain Brake"

in

yourOwner's

Manual).

7

8

Never attempt to start the

saw

when

the guide

bar

is

in

a

cut or

kerf.

When

you

pull

the

starter grip, don't

wrap

the starter

rope

around

your

hands.

Do

not allow

the

gripto

snap

back,

but

guide

the

starter

rope

slowly back to permit

the

rope

to

rewind

properly.

Failure

to followthis

probedure

may

result

in

injury to

hand

or

fingers

and

may

damage

the

starter

mechanism.

Importantadjustments

Warning!

At

correct idle

speed,

chain

should

not

turn.

For

directions

to

adjust idle

speed,

see

the appropriate

section ofthis Owner's

Manual.

Do

not

use

a

saw

with incorrect idle

speed

adjustment.

Adjust

the

idle

speed

your

..

self according.to the'appro-

priate section ofthis

manual.

Have

your

STIHL

Dealercheck your

saw

and

make

proper

adjustmentsor

repairs.

.

Afteradjusting achain start the

saw,

letthe

engine

run

fora

while,

then

switch engine off

and

recheck

chain

tension.

Proper

chain

tension

Is

very importantat

all

times.

Working COl\dltlons

Operate your

chain

saw

onlyoutdoorsinaventilatedarea.

Operate the saw under good visibility

and

daylight condi-

tionsonly.

Warning!

Take

extreme care in

wet

and

freezing

weather

(rain,

snow,

ice).

Put

off the work

when

the weather is

.

windy,

stormy or rainfall is

heavy.

Clear the

area

where

you

are working.

7

Warning,!

Avoid

stumbling

on

obstacles

such

as

stumps,

roots or

rocks

and

watCh

out for holes or ditches.

Be

extremely cautious when working

on

slopes or

uneven

ground.

There

is increased danger of slipping on freshly

debarked

logs.

.

CuttingInstructions

Grip:

Always

hold the saw firmly

with

both hands

when

..

the

engine

is

running. Place your lefthandon front

handle

bar

and

yourrighthand

on

rear

,handle

and

throttle trigger

..

Left-handers should followthis instruction

too.

Wrap

your fingers tightly

around

the handles, keeping

the

handles cradled between yourthumb

and

forefinger

(ill.

7),

With your

hands

inthis position,

you

can

bestoppose

and

absorb the

push,

pull

and

kickback forces of your

saw

without

having

itslipout

of

yourgrip

(see

sectionof

reactive

forces).

Make

sure yourchain

saw

handles

and

grip

are

in

good

condition

and

free ofmoisture, pitch, oil or

grease.

Wamlngl'Never

use

the

saw

with one

hand.

You

cannot

control reactive forces (see pages

10

to

13)

and

may

lose

control ofthe

saw.

warning!

Do

not

operate

your

chain

saw

with

starting

throttle.

Cutting

with

starting throttle

does

not

permit

the

operator

proper

control

ofthe

saw

or

chain

speed.

Wamingl

Never

touch

a

rotating

chain

with

your

hand or

any

part

ofyour

body.

Wamlngl

Do

not

cut

any

material

other

than

wood

or

wooden

objects.

Use

your

chain

saw

for

cutting

only.

It is

not

designed

for

prying

or

shoveling

away

limbs,

roots

or

other

objects.

When

sawing,

make

sure

that

the

saw

chain

does

not

touch

any

foreign

materials

such

as

rocks,

nails

and

the

like

(ill.

8).

Such

objects

may

be flung

off,

damage

the

saw

chain

or

cause

the

saw

to

kick

back.

In

order

to

keep

control

of your

saw,

always

maintain

a

firm

foothold.

Never

work

on

a

ladder,

In

a

tree

or

on

any

other

insecure

support.

Neveruse the

saw

above

shoulder

height

(ill.

9).

Position

the

chain

saw

in

such

awaythatyour

body

isclear

of

the

cutting

attachment

wheneverthe

engine

is

running.

Stand

to

the

leftofcutwhile

bucking

(see

ill.

10).

Don't

put

pressure

on

the

saw

when

reaching

the

end

of a

cut.

The

pressure

may

causethe bar

and

rotating

chain

to

pop

out of the

cut

or

kerf,

go

out of

control

and

strike

the

operatoror

some

other object. Ifthe rotating

chain

strikes

some

otherobjectareactiveforce (see

pages

10to

13)

may

cause

the

chain

to

strike the

operator.·

9

10

Reactive

forces

during

the

cut,

including

kickba-*

WARNING!

Reactive forces, that

may

occur during

any

cut are kick-

back,

pushback

andpull-in.

Reactive forces

·can

··be

dangerous!

In

any chain

saw,

the powerful force

used

to

cut

wood

can

be

reversed

(and

work againsttheoperator).

If the rotating chain is suddenly stopped

by

contact

with

any solid object like a log or branch or is pinched, the

reactiveforces Instantly

oCcUr.

These reactive forces

may

result

in

loss of control which

may,

in

tum, cause serious

or

fatal injury.

Anunderstaiidin~i

of the

cauSes

of

these

reactfveforces

may

help you

aVoid

loss ofcontrol.

The most

common

reactive forces are

':"ldckback,

-pushback,

-pull-in.

Kickback:

Kickback occurs

when

the upperquadrant ofthebar

nose

contaCts

a solid object

in·

the

woOd

Or

is pinched

(III.

11).

The

reaction of the cutting force of the chain 'causes a

rotational

force ofthe chain saw'in the directidn

Opposite

to the

chain

movement, mainly in the plane

of

the

bar.

This

may

fling

thebar

in

an

uncontrolled arc mainly

in

theplane

ofthe

bar.

Under

some

circumstances the bar

·moves

towards the

operator

who

may

suffer severe or fatal

injury.

It may also

occur during limbing. It also occurs

when

the nose of

the

guide bar is pinched

unexPeCtecDY,

unintentionally

contacts

sorld

material

in

thewood (ill.

12)

oris Incorrectly

used to begin aplunge or

bOring

cut.

The greater

the

force

of

the kfckb8ck reaction, the

more

difficult it becomes for the operator to controf the

saw.

.

...

..-

~

.

Many

factors influence the occurence

and

force of the

!kickback

reaction.

The

~

of

bar

and

saw chain you

~

is afactorinthe forceof

ttie-klCkback

reaction.

;

The

speed

of

~

~wh"

the

cutter

contacts

the

object.

.,'

_

~"

<.~,

),' -

'_'.

".

-

,Kickoaclfforces'Inereuewlth

the

raleOf

Impact·

il

>

\::..:

_"M~:

','

,'i-

~

''''-''f

~_ct~~

u.;

~ose

of

the

b,ar

and

the

~fo.~·{see-IIt-11).'.-

':

,.:

'

".'

KickbaCltVmosfproriOunc:ed

'"1M

upper

quadrantofthe

~bar

ROSa,

,,'.'

SOme

STlHL

chaintypesaredesignedtoreducekickback

forces.

The.cJeptb.aauges:'

Improper

lowering

of

the

depth gauges also

Incre~

the

chanceofa~

:1

The

sharpening

condition:

warning!

Adun

orimpropertysharpen.ed

~

mayIncreasethe

risk

of

kickback.

Always cut

with

a property sharpened chain.

",

Devices

for

reducing

the

risk

of

Idckback

Injury

STlHL

has

developed a chain stopping system to reduce

the

risk

ofinjury

In

certain kickback sItuations.Jt~ called a

Quickstop.

""

.,

The,

,Quickstopis,

av-.i~

as

an

optiQn on most STIHL

chain.saws.

' .

Wti.

a~

oc:curs

the

guide.bar

may

iotate

around

the

front

handle. H

the

cutting position

Is

such that

the

operatOr's

left

hand

is

gripping

the

froI1t

hBrldle

behind

the

hand

guard,

and

ifthe left hand rotates around the front

handle and contacts the front:

hanef

guard, which is the

,Quickstop activating

lever,.

this contact

will

activate the

.Quickslop

and,~

the;chaln'(~

ill 13). '

\

The

~.brake

of

some

STlHL

chain

saws

isadditional

.

self-activated

by

fnertia.·

see

appropriate.

ct1apler

"ChaIn

Brake"dt

yo~r

<?wner's

ManuaL

', ,

,

Kickback

tendency increases as

the

radius orsize

of

the

guide

bar,

noseAncreaseLSTIHL has

developed

guide

bars

with

small

nose

radius.

These

bars.are designed to

reduce

the

kfckback

tendency

and

are available, as

an

option.

STlHL

taas~

d~~

chains

whoseconftgu,r~

are

~ned.to

reduce.~

forces. These.

chains

are

available

as

an

option.

.

Warning!

Chain

saw

kickback

may cause serious orfatal

'injury.

To

reduce the

risk

of

kickback

injuries snHL'recommends

that

you

equip

your

saw·With

anarrow),ose

bal,

lOW

profile

chain

or

oth8r

chatn

deSIgned

to

reduce

'kickback

forces,

..

~aS11HL~.

WarningI

~o

Qulcksk;Jp

or

ch~

~

de~

.prev&n!SkIckback.

These

devices

are

designed onlyto stopthe chain.

if

acti-

vated,

in.

certainkickback

situations.

In

~r

for the

Quickstep

to

reduce

the

riSk

of

'kiCkback

inj~,

it

mUst

be

P"'~

mai~

anei'ln

gOod

working

order.

In

addition,

there

mustbe

enough

distancebetween

the

bar

and

the operatorto ensure that

the

Quickstop has

sufficienttimetoactivate

and

stopthe chain before poten-

tial contact

with

the

operator. '

11

13

Warning!-

Even

ifyour

saw

is

equipped

with a

Quickstop,

a

n8J'l'OVl

nos.e

_~

or

~uced

kickback

chain,

this

does

notguaran-

tee'th8t'you

'!III

not

be

Injuied by

kfcftback,~and

therefore

always-

observe

aU

safety

prec8utlons

to

avoldldckback

situations.

Toavoid kickback

The

best'

protection

-from

perSonal

injury that

may

result

from

kickback·

Is

to

avoid

I<k:kb8Ck

Situations:

. ,

'~

1.

~kI

the

chain

saw

firmly

with

both handsandlnalntain

a

secure

grip.

2.

Be

aware

of1he

location

Of

the

guide bar

nose

at

aU

timeS.

-':'

3. Neverbringthenose

Of

theguide

bar

In

COntactwfth

any

.

~bject.

Do

not

cutlimbs

with

the nose ofthe guide bar.

.

Be'~DIhi

car8fulWhti

smalftb'

h'nmbS.

sman

SIze

~.'.1

..

ug

, brustf

antf'saplIngs

which

may

eaSily

catchthe

chain.

.

~.-

,,'

."

~',

.

4.

Don't

overi8ach.

i_

12

5. Don'tcut above shoulder height.

6.

Begin

cutting and continue

at

fuU

throttle.

7.

Cut

only

one

log

at

a

time.

8.

Use

extreme

caution

when

re-entering

a-previous

cut.

, • > ~

9.

Do

notattemptplungecuts (see

page

18) if

you

arenot

experienced

with

theSe

cutting

techniques.

10.

Be

alert forshifting

of

the

log

orother forces that

may

cause

thecutto

close

arid

pinch

thechain.

11.

Maintain saw chain properly. Cut

with

acorrectly shar-

pened, properlytensioned chain at

all

times.

12. Statid

to

the side

of

the cutting path of the

ch8Jn

saw.

Pusliback:

~hback

occurs

when

the

chain

on

the

top

of

the

bar

is

suddenlystopped

when

Ills

pInChed.

caughforencounters

a foreign object in

..

wood.

The

reaction

of

the

chain

drives the

saw

straight back toward the operator

causing

loss

of

saw

cOntrol.

PUshbackfrequenttyoccws

when

the

topofthebar

Is

used

forcutting (see

111.14).

_'

To

8VoIcI

puShback

1.

Be

alertto forces orsituations

that

may

cause

material

to

pinchthe

top

of

the

chain.

2.

rlc?

notcut~reth~

one

log ata time.',

3.

Do

nottwistthe •

when

withdrawing the

bar

from

a

plupge

cut

or

und8r~

cut (figures 25

to

'Zl

and

33,

pageS

16, 17 and 19),'

becaUse

the chain

can

pinch.

'. ,

Pull-ln:

PuU-ln

occurs

when

the

chain

,on

the bottom ofthe

bar

Is

suddenly

stopped.

The,chain

on~8

bottomoUhebarstops

when

it

is

pinched, caught orencounters a foreign object

In

the

wood

(see

HI.

15).

The reaction of the chain pulls

theS(lW forward, causing

Ute

operatorto

Iotle

control.

Pull-4n.frequently

occurs

when

the

buR.per

sPIke

ofthe

saw

Isnot.I)eId,secureIyagainst

the

tree orlimb

and

when

the

chain

is not'rotating atJuU

speed

before It contacts the

wood.

WBmlngf

Use extreme.caution

when

cutting small size

brush

and

sapOF.'9$.'

whfch

m~y

easily catch the.chafn

and

pull

you

off

balance.

'.

To

aVoId

pu~1n

','

...

'

_",,','

1.

~

St$rt'a

cut

with

'the

Ci1aJn

rotating at

full

speed

and

the

bumper

SpIk8'~,COhtactwlth

1he

wood.

2.

PuU-in~8ISo~pre~~~:~~:_toopen

the

kerf

Or

cut.

-' '

Femng

is,

cuttll'I9

down a tree.

Before

femng

atree, considercarefully

afl

conditions

which

may

affectthe direction offall/including:

The

intended direction

of

the fall.

The

natural

lean

ofthe tree.

Any

MOusuallyheavylimb

atru.cture.

Surrounding

trees

and

obstaQles.

The

wind

direction andspeed.

Warnlngt

Always

observe the generalcondition ofthe tree.

Look

for

decayand,rot

in

thetrunk-If

iUs

rottedinside, itcouldsnap

and

faD

towardtheoperatorwhile beingcut.

Alsolookfor

broken

or

dead

brandies

which

could vibrate

loose

and

fall

on

the

operator.

When

felling

on

a

slope.

the

operator

should

stand

on

the

up-hiIJ

side

Hpossible.

13

When felling in the vicinity of roads, railways and power

lines, etc

..

take extra precautions (see ill.

16).

Inform the

police,

u1ifity

company

or

railway au1hority before begin-

ning

to

cu1

.

When felling, maintaJn a distance of

at

least·

2'h

tree

lengths

from

the nearest person (see ill.

17).

Note:

14

The noise of your engine may drown any warning call.

Felling

Instructions:

Firs1

clear the tree base and work area from interfering

limbs end brush and clean its lower portion with

an

axe

(ill.

18).

.

Then, establish.a path of escape and remove all obstacles.

This path should be opposite tothe planned'dlrection ofthe

fall

of

the tree end at a

4S.

angle (ill. 19). An alternate

path must also be selected. Place all tools and equipment

a safe distance away from the tree,

bu1

not

on

the escape

path.

20

H

ttle.~,,~

large

~

cut

Into

the

largest

.-.

~utbeSSes

vertically;

first,

(hori,zontally

next)

and

remove

(Hl20~

,,;

~

d8t8rmiil8,

the

placement

of

the.feUIng

note."

(Ul2t).

1J1e'~

~

,poper:tY

,placed

determ1r)es

the

directioh

In

whJchthe

treewiiUaLIt

Is

madeperpendicular

to

the

nne

Of

f8n

&net

shOUld

be.

close

to

the

groUnd

as

possible. Cutthe

felling

notch

to

a

dePth

of

abOut

one-fifth

to one-fourth of the trunk diameter (Ill 22). It should be

In

no

~

higher than it is

deep.

Make the felling notch

verycarefully.

Begin

the

felUng

cut slightly higherthan the

feDing

notch

and.

ora

the

opppsite side of

tIMI

tn!e

(ill.

.22).

Then

cut

ho~l)I~h:toward$

~

~,n,g

notch. Apply the

chab1

saw

with its

spikes

dlrecdy

t;MlhIndthe

~

portion

of

wood and cuttoward the notch (ill

23~

Leave

approx-

imately

'ho

.o1.the

~

dlam_~

~n.c;ul

This is

the

hln.ge

(III.

23}.'Ofi'i1ot

Cut

thrOugh

the

hinge

_use

you

Could

lose control

of

the direction

of

the

faIL

Drive wedges into

the

felfll'l9.

~t

~

to

COI1tmI

the

direction

oftha

ftdl.W~es

shouldbeofw9Qd.

Ught

alloy

or

plastic-

never

~'~

Which

can

~

kIckback,and

~

tothechala

22

Hinge

---i~

Felling

notch

-*

Hinge......,........,H

Felling

notch

15

16

24

A'iways

keep

to

the

side ofthe

f8Jling

tree.

When

the tree

starts

to

fall,

shutoff

the

engine.

WIthdraw

the bar

and

walk

away

on

the pre-plannedescape

path.

Watch

outfor

failing

limbs.

Warning! :

Be

extremely careful with partially fallen trees

which

are

poorly

supported.

When

the tree

h~;or

19r

~

other

reason

does

not

fall'

completelY,

set"the

saw

asfde'and

pull

the tree

down

with

a cabIe·wlnch,btockand tackle ortJactor.lfyou

try

to

cut

it

down

with

your

saw,

you

may

be

injured.

Sectioning Method

warning!

.

Felling

atree that has adiameter greater than the

length

of

the

guide bar

requl~

use

of either the

sectioning

or

plunge-cut

method.

These methods' are

extremely

dangerous

because they

InvolVe

the

use

of the

nose

of

the

guide

bar

and

can

result

In

kickback. Only

property

trained professionals should attempt· these techniqueS.

25

Forthe

tteeHOriing

methOd

(HI.

24)

make

thefirstcut

with

the

guide bar fanning

tn

toWard

the·

hinge. Then,usmgthe

bumperspike asa pivot, repositionthe

saw

forthenext

cut.

Avoid

reposftioning the

saw

more

than

necessary.

When

r8poSltiori!rig

fci

the

11Et~

~

ic8ep

'the guide

~r

.i¥!Iy

engaged

in the

kerr

to keep

the

fettlng

cut

strafght

If

the

saW

begins

to

pinCh.

inSert

a

w8dge

to

openthe

cut.

On

the

~

cut.

dO

not

cut

the

hinge.'

Plunge-Cut

~

Tmber

haVIng

a diameter

more

than

tWice

the

!ength

Of

the

gUKJe

bar

reqUires

the use of the

plunge-(x.it

method

before

making

th.e

f8lHngcUt . .

First.

cUt

a large. wide

nOtch.

Make

a

plunge-

cut

In

the

centerofthe

notCh.

. . .

The-

plunge

cut

is

made

with

the guide'

~

nose.

BegIn

the

plunge.

cUt

by

'applylitg

the

lower

portiOn

of

the

guide

bei

nose

to

the

tree

at

an

angle

(ill.

25)~

Cut until

the

dePth

ofthe kerf

Is

aboutthe

same

as

the width

of

theguide

bar

26"

28

~

.

\A)

~

29

(m.

26).

Next,

align

the saw

In

the direction

In

which the

recess

isto

be

cut."

.

WIth

the

ssw-

at

fulithrotUe, insert

th8

guide bar

in

the

trunk

(II!.

27).

Enlarge

the

plunge

cut as

shown

In

illustration (ill.

28).

warning

I

There

is

an

extreme

danger

of

kickback

at

ttris point.

Extra

caution

must

be

taken

to

maintain

control

of1he

saw.

To

make

the

felting cut,

..

follow the·sectlonfng

rnettiod

describedpreviously (ill.

29).

Hyou

are

inexperienced with a

chain

saw prunge-cutting

should

not

be

attempted.

Seek

the help

of

a professional.

Umbing

Umbing .is

removing

the

branches

from

a fallen tree.

WBmIngl

There is an

extreme

danger

of

kickbackduring the limbing

operation.

Do

not work with thehose

of

the

bar.

Be

extre-

mely cautious

and

avoid contacting the

log

orother limbs

with

the

nose

of

theguide bar.

00

notstand

on

alog while Ilmblng it-youmayslip orthe

log

may

roll.

17

Po

18

Start

Umbing

by

leaving

the

lower

limb$

to

support

the

log

off

the

ground

(ill. 30).

Always

cut

f~

the

top of the

limb.

Do

not

underbuckfreely hanging limbs

•.

A pinch

may

result

or

the

limb

may

fall,

causing

loss

of

control.

If a

pinch

occurs,

stop.the

engine

and

remove

the

saw,

by

liftingthe

limb.

warning!

Be

extremely

cautious

when cutting

limbs

undertension.

The

limb

could

spring backtoward

the

operatorand

cause

loss ofcontrol of

the

saw

orinjury

to

the

operator.

Bucking

is

cutting a

log

into

sections.

Warnings!

1.

When bucking,

do

not

stand

on

the

log.

Make

sure

the

log

will

not

ron

down-hill. If

on

a

slope,

stand

on

the

up-

hill

side

of

the

109

(see

Ill.

31).

Watch

out

for

rolling

logs.

2.

Cut

only one

log

atatime.

3.

Shattered

wood

should be cut

very

carefully.

Sharp.

sliversof

wood

may

be

caught

and

flung

in

the

direction

ofthe operatorof

the

saw.

4.

When

cutting

small

iOgS~

Use

8SaWhorae-(iD.

32).

NeVer

permitanother

person

to

hold

the

log.

Never

hold

the

log

with

your

leg

or.foot.

5.

Logs

under straln,'require

sPecial

attention to

prevent

the saw

trpm

pinch1n.g

•.

The

fifst cut·is

made

on

the

compression

side to relievethe stresS

on

the

log

(see

III.

33~

34).

The

bucking

cutis

thEm

made

as

shown.

Ifthe

saw

pinches,

stop

the

engine

and

remove

it

from

the

log.

6.

Only

properly trained professionals

should

work

in

an

area

where

the

logs,

limbs

Bn.d

roots

are

tangled

(i.e. a

1.

Refoeving

cut

33

. 2. Cross art

34

blowdown area, ill. 35). Worldng

in

blowdown areas

is

extremely hazardous.

7.

Drag the logs into a clear area before cutting. Pull out

exposed and cleared logs first.

Maintenance BDd Repair

Never operate a chain saw that is damaged, improperly

adjusted

Of

not completely or securelyassembled. Follow

the maintenance and repair.instructions

in

the appropriate

section of your

Owne~s

Manual.

warning!

Always stop the engine and make sure that the chain is

stoppe.d

before doing any maintenance or repair

wor!<

or

cleaning the saw.

Do

not attempt any maintenance or

repair

wor!<

not described in your

Own~s

Manual. Have

such work performed at your STlHL service shop orily.

MAINTAINING

AND

STORING

THE

SAW

Keep the chain, bar and sprocket clean and lubricated;

replace worn sprockets or chains.

Keep the chain sharp.

You

can spot a dull chain when

easy-to-cut wood beccmes hard to cut and bum marks

appear

on

the wood.

Keep the chain at proper tension. Tighten all nuts, bolts

and

screws

except

the

carburetor

adjustment

screws

after

each

use.

Keep

spar!<

plug

and

wire connection tight and clean.

Store saws

In

a high or locked place, away from children.

19

Stihl 090 User manual

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