Brother International LK3-B431 MKII Instruction Manual - Page 22

3.

INSTALLATION

3-14

.

Installing

the

V

-belt

0

A

B

Approx.

9-10mm

tc,

10N

0

V

-belt

Sewing

f

machine

C

C)

0

O

O

O

Motor

1.

Gently

tilt

back

the

machine

head,

and

then

place

the

V

-belt

0

into

the

V

grooves

on

the

machine

head

pulley

0

and

the

motor

pulley

0.

NOTE:

After

tilting

back

the

machine

head,

do

not

push

the

face

plate

side

or

the

pulley

side

from

above.

2.

Gently

return

the

machine

head

to

its

original

po-

sition.

*

Be

careful

not

to

clamp

the

cords

at

this

time.

3.

Provisionally

install

the

accessory

tension

pulley

assembly

0

with

the

accessory

flat

washer,

spring

washer

and

bolt.

4.

Adjust

the

belt

tension

by

moving

the

tension

pul-

ley

assembly

to

the

right

and

left

so

that

there

is

9-

-10

mm

of

deflection

in

the

V

-belt

0

when

it

is

gently

pushed

in

the

middle

with

a

force

of

ap-

proximately

10

N.

After

adjusting,

tighten

the

bolt

C)

to

secure

the

left

pulley

assembly.

5.

Move

the

right

tension

pulley

so

that

there

is

a

gap

of

about

1

mm

between

it

and

the

V

-belt

0,

and

then

tighten

the

bolt

8

to

secure

the

right

pulley

assembly.

NOTE:

Use

brother

specified

V

-belt

(belt,

VM}.

The

V

-belt

0

may

stretch

slightly

when

it

is

first

used,

so

adjust

the

belt

tension

after

about

3,000

cycles

of

use.

When

above

belt

tension

is

week,

this

will

be

cause

of

following

problems;

•

Noise

&

vibration

become

large.

•

Needle

up

stop

position

becomes

unstable.

•

Error

message

EE

-50]

is

displayed.

Check

that

the

motor

is

positioned

so

that

the

V

-

belt

is

straight.

(Fig.1)

Fig.1

15

LK3-B430E-,

B431E-, B432E-,

8433E-

Mark

II

Brother International LK3-B431 MKII Instruction Manual - Page 22

Installing

Page 22 highlights