Poulan 1980-06 User Manual - Page 17

b.

CHAIN

REPLACEMENT

1.)

Replace

the

chain

when

cutters

or

links

break.

2.)

See

a

qualified

service

dealer

to

replace

and

sharpen

individual

cutters

founatch-

ing

your

chain.

3.)

Always

replace

the

worn

sprocket

when

installing

a

new

chain

to

avoid

excessive

wear

to

the

chain.

<

2.

GUIDE

BAR

MAINTENANCE

•

Conditions

which

can

require

guide

bar

maintenance:

—

saw

cuts

to

one

side

—

saw

has

to

be

forced

through

a

cut

—

inadequate

supply

of

oil

to

bar

and

chain.

REMOVE

SAWDUST

FROM

GUIDE

BAR

GROOVE

I

Figure

36

•

Check

the

condition

of

the

guide

bar

each

time

the

chain

is

sharpened.

A

worn

guide

bar

will

damage

the

chain

and

make

cut-

ting

more

difficult.

•

Replace

the

guide

bar

when:

—the

inside

groove

of

the

guide

bar

rails

is

worn.

_

—the

guide

bar

is

bentorcracked.

a.

Remove

the

guide

bar

to

service.

b.

Clean

oil

holes

at

least

once

for

each

five

hours

of

operation.

c.

Remove

sawdust

from

the

guide

bar

groove

periodically

with

a

putty

knife

or

a

wire.

Figure

36.

d.

Remove

burrs

by

filing

the

side

edges

of

the

guide

bar

grooves

square

with

a

flat

file.

Figure

37.

e.

Restore

square

edges

to

an

uneven

rail

top

by

filing

with

a

flat

file.

Figure37.

CORRECT

GUIDE

BAR

WORN

GROOVES

GROOVE

FILE

EDGES

SQUARE

Figure

37

B.

IGNITION

AND

EXHAUST

SYSTEMS

•

Carbon

deposits

will

build

up

on

exhaust

ports,

spark

arrestor,

muffler,

and

spark

plug

as

the

saw

is

used.

All

of

these

parts

should

be

cleaned

at

the

same

time

to

prevent

engine

damage,

overheating,

loss

of

power,

and

hard

starting.

•

Clean

parts:

—as

required

—at

least

once

for

each

25-30

hours

of

opera-

tion

1.

COOLING

AND

EXHAUST

SYSTEM

•

Carbon

build-up

on

the

cooling

and

exhaust

system

can

cause

the

engine

to

lose

power

in

a

cut.

•

Keep

the

spark

arrestor

clean

at

all

times.

•

Replace

the

spark

arrestor

when

breaks

in

the

screen

are

found.

Items

required:

—

wire

brush

—

3/8"

wrench

—

hardwood

stick

SPARK

ARRESTOR

HEA

SHIELD

i"j

:9?Ccr;

\

-

MUFFLER

Figure

38

SCRAPE

CARBON

DEPOSITS

FROM

EXHAUST

PORTS

Figure

39

a.

Disconnect

the

spark

plug.

b.

Remove

the

muffler,

baffles,

and

screen.

Fig-

ure

38.

c.

Pull

the

starter

rope

until

the

piston

moves

far

enough

to

close

the

exhaust

ports.

d.

Scrape

the

carbon

deposits

from

the

exhaust

ports

and

surrounding

exhaust

chamber

using

a

hardwood

stick.

Figure

39.

CAUTION:

Do

not

use

a

metallic

scraping

tool

to

avoid

damage

to

the

piston.

e

Blow

out

loosened

carbon

with

compressed

air.

f.

Clean

the

spark

arrestor

screen

with

a

wire

brush

or

replace

if

breaks

in

the

screen

are

found.

g.

Reassemble

muffler

parts.

17

Poulan 1980-06 User Manual - Page 17

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