Singer 491utt User manual

SINGER

491UTT

From the library of: Superior Sewing Machine & Supply LLC

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~~91uTT

..

AAachine

THE

SINGER

COMPANY

From the library of: Superior Sewing Machine & Supply LLC

To

avoid improper handling and

use

of

the

motor,

which

may

cause

trouble

or

shorten its service life,

read

this manual

carefully.

Please

keep this manual

for

future references.

CAUTION:

Static

electricity

will

damage some electronic

components in the

control

box. Refer service

of

circuit

boards

to

qualified electronic service

personnel.

TABLE

OF CONTENTS

Page

Subject

1

INTRODUCTION

................................................

1

2 CODE

..........................................................

2

3

INSTALLATION

.................................................

3

4

ELECTRICAL

CONNECTIONS

.....................................

5

OPERATION

....................................................

7

6 ADJUSTMENTS

................................................

14

7

MAINTENANCE

................................................

17

8 HOW

TO

CHECK

THE

DRIVE

UNIT

..............................

20

9

DIMENSIONS

..................................................

22

10

BLOCK

DIAGRAMS

.............................................

24

11

PARTS LIST

...................................................

27

From the library of: Superior Sewing Machine & Supply LLC

ll:CODE·~

----~--

2-1.

Motor

U4053607

-01

E

Suffix

code

Voltage

code

Frequency

code

Phase

code

'--------Horse-power

code

'---------Series

code

-TABLE

6

5

4

3

2

TABLE

1•

Seriescode

TABLE

2

Horse-power

code

4

Pole

1750rpm

motor

2

1/2

HP

2

Pole

3450rpm

motor

3

1/3

HP

4

1/4

HP

5

3/4

HP

TABLE

3 Phase

code

TABLE

4•

Frequency

code

1 I

Smgle

phase

3

Three

phase 5

50

Hz

6

60Hz

7

50/60Hz

TABLE

5

Voltage

code

TABLE6.

Suffixcode

Belt

tightener

Lamp

tap

62

115

v 01

~f-_0__7

220

v)

02

08

2'm\l_

_.03.

10

110/220

V

Dual

voltage

07

17

220/380

V

Dual

voltage

08

26

415

v

27

380

v

28

460

v

2-2.

Control

box

NC8122407

-

Function

code

1T

--r'---Voltage

code

Series

code

(Machine

class)

TABLE

7 Series

code

r\

vt

2.~

2..3

~t

~

-

~

591

machine

~

General

purpose

(Function

01

-[4-4

211/212

machine

-'l'Q.

457

machine

TABLE

8

Function

code

01 2

positioning

only

02

2 pos .

UTT,

Wiper

I

only)

I

J

USA

type

DIN

type

DIN

type

USA

type

USA

type

·TABLE5

_TABLE

8

TABLE7

-

t-mJ

2 pos.,

UTT,

Wiper,

Presser

foot

lift.

Manual

back

tack

;:-'

04

03

type

plus

switch

box

P/N

411872-001

'!d

s(

6V

12

v

6V

.

14

03

type

plus

switch

box

411872-002

:;X;<

<)

2--

-

24

03

type

plus

switch

box

P/N

411872-003

.

to/

SJ

--

,,

U L

approved

I

CSA

approved

I

w/switch

I

From the library of: Superior Sewing Machine & Supply LLC

3-3

Installation

of

optional

switch

box

Install

the

switch

box

on

the

thread

stand

by

using

the

mounting

braket.

As

shown

in

fig.

6,

adjust

the

position

of

the

switch

box

where

most

convenient

for

the

operations.

fig. 6

NOTE:

fig. 7

Thread

stand

Attach

the

connector

of

the

selector

panel

to

the

control

box

using

the

following

method.

(fig.

7)

(1)

Cut

the

protective

cap P

along

with

a

dotted

line

on

the

Control

Box.

(2) Push

retaining

fingers

outward

and

insert

the

connector

of

the

switch

box.

Projection

on

connector

must

face

downward.

(3) Push

retaining

finger

toward

connector

to

lock

securely.

(4)

Run

the

lead

cable

from

connector

in such

manner

that

any

strain

on

the

con-

nector

is

definitely

avoided.

Connector

Protecttve

cap

P

N.G.

O.t::.

3-4

Installation

of

Knee

Switch

(211/212

machines)

The

knee

switch

is

placed so

that

the

operator's

right

knee

falls

between

it

and

the

knee

presser

foot

lift.

Locate

the

switch

and

bracket

as

shown

in

figure

6

so

that

the

operator

can

convenient-

ly

operate

both

presser

foot

lift

and

the

separate knee

switch

without

excessive

movement

of

her

knee. Secure

switch

bracket

to

underside

of

table

with

screws

provided.

fig. 8

SCREW

ADJUSTMENT

FOR

CON-

VERTING

TWO

POSITION

UNITS

INTO

SINGLE

POSITION

UNIT_

TO

OPERATE

UP

AND

TRIM----.L.

WITH

THE

TREADLE.

BACK

OUT

THIS

SCREW

UNTIL

THE

SWITCH

IS

ACTUATED.

From the library of: Superior Sewing Machine & Supply LLC

211/212 mach1ne

Power

supply

~

~Clutch/Brake

Foot

L1ft sw.

11

I

121,

Foot

L1ft

sol.

131

141

Synchron1zer

Back

Tack

sw

11

I

121.

Back

Tack

sol

131

141

Needle

up

sw.

11

I

121.

Trrm.

sol

131

141

Sw1tch

for

Trrmmer

457 mach1ne

' Tension release sol.

11

I

121.

Needle

up

sw

131

141.

~

Back

Tack

sw

151 161

Synchron1zer

~Back

Tack

sol

11

I

121.

Trim.

sol

131

141

~

Foot

L1ft

sw.

11

I

121.

Foot

L1ft

sol

131 141

Needle

down

signal

NOTE:

As

for

the

details

of

each respective

connection,

please

see"BLOCK

DIAGRAMS"

4-4

Synchronizer

con'nections

Before

starting

operation.

insert

the

synchronizer

connector

into

the

corresponding

receptacle

on

the

connector

panel.

4-5

Connections

of

the lighting

fixture

Two

black

wires

are

provided

for

6

Volt

20

Watt

lighting

fixture

in

the

end cover

of

the

motor.

Please

connect

properly

when

it

will

be needed.

IMPORTANT:

USE

LAMP

ASSEMBLY

CERTIFIED

FOR

USE

WITH

SEWING

MACHINES

ONLY.

LAMP

CONNECTIONS

HAVE

FULL

SUPPLY

LINE

VOLTAGE

TO

GROUND.

MINIMUM

CIRCUIT

CAPACITY

OF

CONDUCTORS

15

AMPS.

TO

AVOID

ELECTRIC

SHOCK

AND

SHORT

CIRCUITING,

THESE

LAMP

WIRES

MUST

BE

INDIVIDUALLY

AND

SECURELY

INSU-

LATED

AFTER

CONNECTING

TO

THE

LAMP

ASSEMBLY.

4-6 Changing

the

primary

taps

of

the

transformer

used

in

220V

-

240V

control

box

The

transformer

which

is

located

in

the

control

box

has

the

four

taps (

190V

-208V

-220V-

240V).

The

factory

sets

the

tap

at

rated

nameplate

voltage.

Before

starting

operation,

check

your

power

supply

and

if

necessary. change

the

connection

to

the

proper

tap

by

turning

the

voltage

selector

installed

on

the

control

box.

fig. 11

Voltage

selecter

switch

Control

box

I

t

From the library of: Superior Sewing Machine & Supply LLC

5-6

AUTOMATIC

BACK

TACKING

(Function

code

of

Control

Box

04,

14

and

24)

1)

Back-tack

patterns

These

patterns

can be selected

by

manipulating

the

back-tack

switches.

Fig.

16

below

shows

the

respective

switch

positions

for

the

back-tacks

at

the

start

and

end

of

sewing.

a)

No

back

tacking

b)

Single

back

tacking

c)

Double

back

tacking

d)

Quadruple

back

tacking

fig.

16

BACK

TACK

&-U I I J

Start

w,

v,

},

I I I

M

!\

~

l End

2)

Pre-setting

the

stitches

of

back

tacking

The

number

of

stitches

for

each segment

(A,

B,

C

and

0)

of

the

back

tacking

can be ad-

justed

from

0

to

9

by

the

stitch

counter

switches

shown

on

Fig.

17.

If

it

is

desired

to

increase

the

number

of

stitches,

push

the

lower

button

to

the

required

number.

When

decreasing

the

number

of

stitches,

push

the

upper

button.

fig. 17

5-7

LINE

TACKING

fig.

18

STITCH STITCH

~~ ©~

·:&·~

©~

138

88

BB

138

[!][!]

rnrn

~rn

IE IE

l!lli!

l!l!B

{!][!!

y

~

Funct1on

code

14

Funct1on

code.

(Function

code

of

Control

Box

14)

1)

Switch

for

Iine

tacking

operation

..f!.,

1313

[ID[]J

ffili!

~

24

A+C

B+C~:O

The

line

tacking

can be selected

as

follows.

e

I

'

Funct1on

code

14

Push

the

switch

to

the

upper

position

as

indicated

at

left,

when

the

Iine

tacking

is

required.

2)

Pre-setting

the

stitches

of

line

tacking

The

number

of

stitches

of

each segment in

the

forward

sewing

mode

can be

adjusted

by

the

stitch

counters

A

and

C

from

1

to

18

stitches.

(Simply

add

the

numbers

A

and

C)

The

number

of

stitches

of

each segment

for

the

reverse

sewing

mode

can

be

adjusted

by

the

stitch

counters

Band

C same

way

as

above.

The

repeat

times

can be

adjusted

by

stitch

counter

0

from

1

to

9.

From the library of: Superior Sewing Machine & Supply LLC

2) Details

of

pattern

sew1ng

a)

Pattern 1

(Normal

sewing)

I

By

pressing the pedal

down,

the machine

will

start

the

sewing

with

start back tack (SBT)

as

the selection

of

SBT

II

During

the free sewing,

by

releasing

the

pedal

to

the

nutral,

the

machine stops at

the

first

needle

position

and

by

heeling back

the

pedal

to

the

intermediate

position,

Foot

Lift

(FT)

wi

II

be

operated.

ill

By heeling back the pedal

fully,

the

machine

performs

the thread

trimming

(TRIM)

with

end back

tacking

(EBT)

as

the selection

of

EBT.

b) Pattern 2 (Basic

stitch

counting

-one segment

only)

I

By

pressing the pedal

down,

the mach1ne

will

start the

stitch

count

sewing (G)

with

SBT

as

the

selection

of

SBT. As long

as

the

pedal

is

kept

to

be

pressed

down,

the

machine

will

continue

the

stitch

counting

and com-

plete

the

pattern

sewing

with

TRIM

and/or

EBT

II

Except

the

E

BT

period,

operator

can stop the

machine

anytime

by

releasing

the

pedal

to

the

neutral and can

do

TRIM

w1thout

EBT

re-

gardless

the

EBT

selection

c)

Pattern 3

(Combination

of

pattern

1 and 2)

I Same

as

Pattern 2

by

the

point

® .

II

When the machine completed

the

pattern

to

the

point

® , the machine

will

stop

at the

first

needle

position

and FL

goes

up and stays

up

for

12 seconds

or

until

treadle

is

returned

to

neutral and pressed

down

aga1n

for

pivot-

ing

the

materials

If

longer FL

is

necessary,

heel

the

pedal back

to

the

intermediate

position.

ill

Same

as

Pattern 1

after

the

point

®

IV

See

"Note"

in Pattern 6, 7, 8

for

the fine

adjustment

of

the

length

of

"G

".

I .

1 f•g. 22

i

1 fig.

23

i

I

i

I

'

o/\:

I , '

/

c~

X

B

A

D c

L

__

fig. 24

o/\ \

(

c\

X

d) Pattern 4 (Repeat

of

pattern

2)

1 fig. 25

I This

pattern

is

the repeat

of

pattern

2. Oper-

ator

can repeat

as

many

as

she/he wants.

II

The differences are;

i)

At

the

point

of

® ,

to

continue

the pat-

tern,

the pedal

has

to

be

released

to

the

neutral once and pressed

down

again.

ii)

To

finish

the

pattern

with

TRIM

and/or

EBT,

the pedal

has

to

be

heeled back at

the

point®

iii)To

operate

FLat

the

point

of

® , the

pedal

has

to

be

heeled back

to

the inter-

mediate

position.

ill

See

"Note"

in

pattern

6, 7, 8

for

the

fine

adjustment

of

the

length

of

"G".

'

i

A B G

G

®

01

®

C G

X @

L

__

_

NOTE:

1)

2)

In Pattern 2, 3 and

4,

If

the

stitch

counter

G

is

set

to

"zero",

the

sewing

will

not

be started.

If

the pedal

is

heeled back

fully

before

completing

the

G,

TRIM

is

immediately

performed

without

EBT.

From the library of: Superior Sewing Machine & Supply LLC

fig.

28

SW3

~

L;==j

SW3-2

OFF

Option

1

SW3-2

ON

Option

2

SW3-1 .

Not

used

Opt1on

1

Automatic

fin1sh

of

pattern

sev.,ng w1th

TRIM

and/or

END

BACK

TACK

same

as

pattern

2.

Option

2 Free sew1ng

and

TRIM

and/or

END

BACK

TACK

by

heel1ng

the

pedal

same

as

pattern

3.

4)

Fine

adjustment

of

the

length

of

each

stitch

counting

seam

The

length

of

each seam

of

stitch

counting

can be

adjusted

as

follows;

a) Case

1:

If

the

performed

seam

by

the

stitch

counting

is

shorter

than

required.

push

the

switch

for

manual

needle

up

positioning

(MNU-SW)

momentari-

ly

which

is

located

on

the

switch

box.

Then,

the

machine

performs

ONE

stitch

foreward

at

the

low

speed.

(Fig.

29)

fig.

29

b)

Case

2:

fig.

30

Forward

adJustment

MNU-SW

If

the

performed

seam

is

longer

than

required,

use

the

switch

for

manual

back

tack

(MBT-SW)

to

adjust

the

length,

which

is

mounted

on

the

sew-

ing

machine.

In

this

case

the

machine

performs

ONE

stitch

backward

at

low

speed.

(Fig.

30)

~

' I

E

adjustment

NOTE:

1)

If

the

adjustment

for

more

than

ONE

stitch

is

necessary,

repeat

above

until

the

required

length

will

be

performed.

2)

In

this

mode,

both

switches

(MNU,

MBT)

function

in

different

way

from

their

own

functions.

lv

From the library of: Superior Sewing Machine & Supply LLC

16

ADJUSTMENTS

CAUTION:

NEVER

MAKE

ANY

FOLLOWING

ADJUSTMENTS

WITH

"POWER

ON"

AS

IT

CAN

CAUSE

SEVERE

PHYSICAL

INJURY

TO

HANDS,

ARMS,

ETC.

6-1. Adjustment

of

clutch air

gap

A)

Turn

the

adjustment

screw

counterclock-

wise

at

·least

two

turns,

until

the

output

shaft

will

not

turn

freely

any

longer.

B)

Turn

the

adjustment

screw

clockwise

carefully

until

the

shaft

just

begins

to

rotate

by

hand

(At

this

point,

the

clutch

air

gap

is

zero).

Continue

to

turn

the

adjustment

screw

120°

clockwise.

(8

steps

of

ratchet).

6-2. Adjustment

of

needle stop positions

fig.

32

Clutch

end

cowr

At

factory

this

is

pre-adjusted;

however,

if

necessary,

readjust

the

needle

stop

positions

by

turning

the

reflection

plates

of

the

synchronizer

as

described

below.

NOTE:

While

readjusting

the

positions,

trimmer

and

wiper

solenoids

should

be

disconnected.

Do

not

touch

the

reflecting

portions

of

the

reflecting

plates.

(457

machine)

A)

Turn

the

sewing

machine

manually

into

the

"needle

down"

position.

(Make

sure

the

direction

of

rotation

is

correct)

B)

Remove

the

cover

from

the

synchronizer.

(Remove

the

screw

A)

C)

Loosen

the

screw B.

(Do

not

remove

the

screw B)

D)

Turn

the

reflection

plate

A

so

that

the

adjusting

tab

of

plate

A

will

be

located

at

uppermost

position.

E)

Turn

the

sewing

machine

to

the

"needle

up"

position.

F)

Make

the

same

adjustment

of

the

reflection

plate

B

for

"needle

up"

position.

G)

Tighten

the

screw

B.

H)

Replace

the

cover

on

the

synchronizer.

fig.

33

Adjusting

tab

A

AdjuSting

tab

B

To

make

fine

adjustments

follow

the

preceding

instructions

and

...

A)

Operate

the

sewing

machine

with

the

foot

treadle.

B) Press

the

treadle

forward

and

release.

C)

Make

sure

the

sewing

machine

is

in

the

"needle

down"

position.

D)

Correct

for

the

required

needle

position

by

turning

the

adjusting

tab

A.

E)

Heel

the

treadle.

(Needle

stops

in

the

up

position.)

F)

Correct

for

the

required

position

by

turning

the

adjusting

tab

B.

G)

Finally

tighten

the

screw

Band

install

the

synchronizer

over.

CAUTION:

DO

NOT

TOUCH

THE

SYNCHRONIZER

REFLECTION

PLATES

OR

OTHER

ROTATING

PARTS

WHILE

THE

SEWING

MACHINE

IS

OPERATING.

RE-

MEMBER

THAT

FINE

ADJUSTMENT

IS

CHECKED

WITH

POWER

ON.

From the library of: Superior Sewing Machine & Supply LLC

6-3. Regulating

the

force required

to

operate

the

foot

treadle

A)

Downward

force

,---------------------,

Relocate

the

position

of

the

hooked

end A fig.

36

of

the

lever

spring.

The

force

is

reduced

as

this

end

is

moved

closer

to

the

lever

fulcrum.

Also

when

position

of

the

treadle

pitmanrod

is

moved

from

preferred

position

E

to

position

F

force

needle

is

reduced.

8)

Heeling-back

force

Adjust

this

force

with

screw

C.

(NOTE.

Nut

8 serves

to

lock

screw

C)

This

amount

of

force

is

indicated

at

window

D.

The

position

marked

on

window.

D

is

the

position

to

which

the

force

was

preadjusted

at

factory.

c

6-4.

Adjustment

of

the

maximum

speed and back tacking speed

A)

Maximum

speed

The

rotary

control

"MAX"

to

adjust

the

maximum

speed

is

mounted

behind

the

rubber

cap

located

at

the

front

of

the

control

box

as

shown

on

Fig.

37.

At

the

factory,

it

is

adjusted

to

the

highest

speed

(Synchronous

speed),

if

necessary,

remove

the

rubber

cap and

then

carefully

turn

this

rotary

control

counter-clock

wise, using a small

screw

driver.

The

operating

speed

is

adjustable

from

the

maximum

synchronous

speed

to

the

lowest

speed

(ordinarily

200

RPM)

in

about

200

RPM

steps.

The

lower

speed

is

convenient

for

the

training

the

beginner.

However,

the

longer

the

use

of

the

lowest

speeds,

the

shorter

the

life

of

the

clutch

and

brake

linings.

B)

Back-tacking

speed

The

rotary

control

"8T"

to

adjust

the

back

tacking

speed

is

mounted

on

the

printed

circuit

board

which

is

located

in

the

modular

shown

in fig.

37.

At

the

factory

it

is

adjusted

to

1,500

RPM

for

591

machine,

1,000

RPM

for

211/212

machine

and

1,400

RPM

for

457

machine.

When

speed

adjustment

is

required

for

controlled

back

tacking,

adjust

following

these

instruc-

tions:

a)

Remove

the

screws.

(4

pes)

b)

Pull

the

handles

of

the

module

till

the

position

at

which

the

module

can be

hung

by

the

hook.

c)

Adjust

to

get

required

back

tacking

speed

by

turning

the

control

"BT"

with

small screw

driver.

The

back

tacking

speed

is

adjustable

from

its

lowest

speed

(ordinarily

200

RPM)

to

approxi-

mately

3200

RPM

in

about

200

RPM

steps.

fig.

37

Module

Hook

Rotary

control

"BT"

Screw

Rotary

control

''MAX''

Handle

NOTE:

a)

All

rotary

controls

are

of

the

"click"

type.

When

making

adjustments,

be

certain

that

they

click

into

position.

b)

Do

not

touch

the

"POS"

rotary

control

on

the

printed

board.

This

adjusts

the

minimum

speed

and

cutting

speed: these are

previously

adjusted

at

the

factory

to

suit

the

characteristics

of

specific

modes

of

sewing

machines.

jb

From the library of: Superior Sewing Machine & Supply LLC

C)

Application

of

coating

to

lining

surfaces

a)

Squeeze an

amount

equal

to

about

2

match

heads

from

the

tube

and

apply

to

the

lining

surface

of

either

the

clutch

or

brake

in 8 places.

NOTE: Be ·careful

not

to

apply

too

much,

because

this

may

cause a

malfunction

of

accurate

stopping,

also

the

motor

might

not

operate

even

when

power

is

turned

on.

b)

Firmly

press

the

uncoated

lining

surface against

the

coated

surface.

c)

Rotate

the

moving

discs against each

other.

d) Clean

away

any

excess

which

squeezes

out

between

the

lining

surfaces.

fig.

40

0)

Application

to

clutch

shaft

Clean

away

any

waste

or

lint

adhering

to

the

splines

of

the

clutch

shaft,

and

apply

the

material

evenly.

E)

Motor

assembly

fig. 41

Assemble

the

motor

in

the

opposite

order

of

disassembly.

F)

Break-in

operation

Perform

a

break-in

operation

soon

after

application

of

coating

to

the

lining

surfaces.

a)

Switch

on

the

motor.

b)

After

the

motor

is

operating

normally.

perform

the

break-in

operation

by

operating

the

treadle

at

least

100

times.

NOTE:

If

too

much

material

is

applied

to

the

lining

surfaces

the

motor

might

not

operate

even

when

power

is

turned

on.

If

this

happens,

remove

excessive

material

from

the

friction

disc

surfaces.

!8

From the library of: Superior Sewing Machine & Supply LLC

1/:fROW

TO

CHECK THE

DRIVE

UNIT

In

case

the

trouble,

proceed

as

follovvs:

1)

Switch

off

the

motor.

2)

Pull

out

all connectors, then reinsert them.

3)

Recheck

to

determine whether problems

have

been eliminated

TROUBLESHOOTING

PROBLEM I PROBABLE CAUSE

CORRECTIVE

ACTION I

I Power

supply

cord

(plug,

protection

Correct

connection

in accordance I

Motor

does

not

switch)

not

properly

connected.

with

Instruction.

I

start

when

turning

i Power

supply

cord (plug,

cord,

Replace

defective

part.

main

switch

on.

protection

switch)

defective.

Motor

winding

defective. Replace

motor.

Plug

for

synchronizer,

clutch,

or

Replace

defective

part

or

clutch

cord

defective;

connection

repair

connections

respectively.

in plug

for

clutch

interrupted.

Plug

for

synchronizer

or

clutch

& Plug in.

brake

.not

1nserted.

Power

supply

cord

(plug,

cord)

Replace

defective

part,

Motor

runs,

but

for

control

box

defective,

or

plug in.

when

activating

plug

not

inserted.

sewing machine Fuse

or

protector

in

control

box

Check fuse

or

protector

in

treadle,

the

open.

control

box.

machine

does

not

Clutch

& brake air gap

too

narrow.

Adjust

air gap in accordance

start.

or

after

a long

time

of

use,

clutch

with

Instructions.

lining

worn

qown

or

defective.

If

necessary, replace

clutch

and

I

brake

discs.

I

Control

box

defective.

1)

Replace

module.

I

2)

Replace speed

control

I lever assembly.

I

3)

Replace

control

box.

i

Voltage

too

low. Have

power

supply

checked.

I

I Machine

or

devices (e.g.

thread

Repair

machine

or

devices.

I

i

Motor

decreases

trimmer)

binding

or

seized.

I speed

Control

box

defective.

1)

Replace

module.

I considerably

or

2)

Replace speed

control

i stops

entirely.

lever assembly.

l

3)

Replace

control

box.

Air

passages

within

motor

and Clean air

passages

in

motor

and

clutch

filled

with

lint

or

debris.

clutch.

Machine

or

devices (e.g. thread Repair

machine

or

devices.

trimmer)

binding

or

seized.

Brake air gap

too

narrow.

Adjust

brake air gap

in

I

accordance

with

instructions.

j

Motor

overheats.

Clutch

and/or

brake

coil

defective. Replace

defective

parts. I

Motor

winding

defective. Replace

motor.

Control

box

defective. 1) Replace

module.

2)

Replace speed

control

i

lever assembly. l

3)

Replace

control

box.

Three phase

motor

operating Check

main

power

supply. !

only

on

two

phases.

Once

main

switch

Machine treadle

is

jammed

or

Replace

or

repair

treadle.

turned

on

actuates

by

own

weight. Check

force

of

speed

control

spring.

machine operates

Clutch

air

gap

too

narrow.

Adjust

clutch

air gap

in

without

treadle I accordance

with

instructions.

i

being actuated. I

Control

box

defective. I 1) Replace

module.

I

Stop

is

only

I

2)

Replace speed

control

possible

by

lever assembly.

turning

switch

off.

3)

Replace

control

box.

From the library of: Superior Sewing Machine & Supply LLC

/

l'-J

DIMENSIONS

22

9-1

MOTOR

59

12

321

ldf"1D

wtre

i.

9213621

I

107

514 231 I

217

518 561

9-2

SYNCHRONIZER

17

481

~-

_____

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---------..1

I

404115911

I

1\

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I

57

____,I

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'

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r-.

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co~d

connec!or

'5

nor

avar 1

able

+or

Nor•e,

Ai'lerrca

Narne

plate

, I

~

10

911

I

r·

I

From the library of: Superior Sewing Machine & Supply LLC

lJ.(j

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P/N

411872-001

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411872-002,

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From the library of: Superior Sewing Machine & Supply LLC

L_

____________________________

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26

457 machine

~---------------------------~

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box

I

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411872-001

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411872-002,

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From the library of: Superior Sewing Machine & Supply LLC

PARTS

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From the library of: Superior Sewing Machine & Supply LLC

Singer 491UTT User manual

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