Poulan 1990-10 User Manual - Page 11

C.

CHAIN

BRAKE

•

This

saw

is

equipped

with

a

chain

brake.

The

brake

is

designed

to

stop

the

chain

if

a

kick

-back

occurs.

•

The

inertia

activated

chain

brake

is

activated

if

the

front

hand

guard

is

pushed

forward,

either

manually

or

by

centrifugal

force.

Figure

15

Disengaged

Front

Handle

[

We

Engaged

Figure

15

•

If

the

brake

is

already

activated,

it

is

disengaged

by

pulling

the

front

hand

guard

back

until

it

touches

the

front

handle.

Figure

15

.

•

When

working

with

the

saw,

the

chain

brake

must

be

disengaged.

A

WARNING

The

effectiveness

of

a

chain

brake

in

reducing

op-

erator

injuries

has

not

yet

been

fully

determined.

We

cannot

represent

that

a

chainbrake

is

an

effec-

tive

safety

device

to

prevent

or

reduce

the

hazard

of

injuries

resulting

from

kickback

DO

NOT

AS-

SUME

THAT

THE

CHAIN

BRAKE

WILL

PRO-

TECT

YOU

IN

THE

EVENT

OF

A

KICKBACK.

In-

stead,

use

the

saw

properly

and

carefully

to

avoid

kickback.

Reduced

-Kickback

bars

and

Low

-

Kickback

chains

reduce

the

hazard

of

kickback

and

are

recommended.

Repairs

on

a

chain

brake

should

be

made

by

an

Authorized

POULAN

PRO

Service

Dealer.

Take

your

unit

to

the

place

of

pur-

chase

if

purchased

from

a

Servicing

Dealer,

or

to

the

nearest

Authorized

Master

Service

Dealer.

TYPES

OF

CUTTING

A.

BASIC

CUTTING

TECHNIQUE

1.

IMPORTANT

POINTS

a.

Cut

wood

only.

Do

not

cut

metal;

plastics;

ma-

sonry;

non

—wood

building

materials;

etc.

b.

Stop

the

saw

if

the

chain

strikes

a

foreign

object.

Inspect

the

saw

and

repair

or

replace

parts

as

necessary.

c.

Keep

the

chain

out

of

dirt

and

sand.

Even

a

small

amount

of

dirt

will

quickly

dull

a

chain

and

thus

increase

the

possibility

of

kickback.

A

WARNING

Kickback

can

occur

when

the

moving

chain

con-

tacts

an

object

at

the

upperportion

of

the

tip

of

the

guide

bar

or

when

the

wood

closes

in

and

pinches

the

saw

chain

in

the

cut.

Contact

at

the

upperpor-

tion

of

the

tip

of

the

guide

bar

can

cause

the

chain

to

dig

into

the

object

and

stop

the

chain

for

an

in-

stant.

The

result

is

a

lightning

fast,

reverse

reac-

tion

which

kicks

the

guide

bar

up

and

back

toward

the

operator

If

the

saw

chain

is

pinched

along

the

top

of

the

guide

bar

the

guide

bar

can

be

driven

rapidly

back

toward

the

operator.

Either

of

these

reactions

can

cause

loss

of

saw

control

which

can

result

in

serious

injury.

Begin

cutting

with

the

bottom

of

the

saw

or

spur

against

the

log.

Figure

16

2.

UNDERSTANDING

REACTIVE

FORCES

Pinch

-kickback

and

Pull

-In

occur

when

the

chain

is

suddenly

stopped

by

being

pinched,

caught,

or

by

contacting

a

foreign

object

in

the

wood.

This

stopping

of

the

chain

results

in

a

re-

versal

of

the

chain

force

used

to

cut

wood

and

causes

the

saw

to

move

in

the

opposite

direction

of

chain

ro-

tation.

Either

reaction

can

result

in

loss

of

control

and

serious

injury

•

Pinch

—Kickback--

-

occurs

when

the

chain

on

top

of

the

bar

is

sudden-

ly

stopped.

—

rapidly

drives

the

saw

back

toward

the

operator:

•

Pull

—In--

-

occurs

when

the

chain

on

the

bottom

of

the

bar

is

suddenly

stopped.

—

pulls

the

saw

rapidly

forward.

3.

PROCEDURE

Practice

cutting

a

few

small

logs

using

the

following

technique

to

get

the

"feel"

of

using

your

saw

before

you

begin

a

major

sawing

operation.

a.

Accelerate

engine

to

full

throttle

before

entering

cut

by

squeezing

the

throttle

trigger.

b.

Begin

cutting

with

the

saw

frame

or

spur

against

the

log.

Figure

16

.

c.

Keep

the

engine

at

full

throttle

the

entire

time

you

are

cutting.

d.

Allow

the

chain

to

cut

for

you;

exert

only

light

downward

pressure.

If

you

force

the

cut,

damage

to

the

bar,

chain,

or

engine

can

result.

e.

Release

the

throttle

trigger

as

soon

as

the

cut

is

completed,

allowing

the

engine

to

idle.

If

you

run

the

saw

at

full

throttle

without

a

cutting

load,

unnecessary

wear

can

occur

to

the

chain,

bar;

and

engine.

1

To

avoid

losing

control

when

cut

is

complete,

do

not

put

pressure

on

saw

at

end

of

cut.

g.

Stop

the

engine

before

setting

the

saw

down

af-

ter

cutting.

B.

TREE

FELLING

TECHNIQUES

1.

CAREFULLY

PLAN

YOUR

SAWING

OPERA-

TION

IN

ADVANCE

a.

Clear

the

work

area.

You

need

a

clear

area

all

around

the

tree

where

you

can

have

secure

footing.

b.

Study

the

natural

conditions

that

can

cause

the

tree

to

fall

in

a

particular

direction.

1.)

The

WIND

direction

and

speed.

2.)

The

LEAN

of

the

tree.

3.)

WEIGHTED

with

BRANCHES

on

one

side.

4.)

Surrounding

TREES

and

OBSTACLES.

-

11

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Poulan 1990-10 User Manual - Page 11

Types, Cutting

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