Singer Centurion 121D200A User manual

SERVICE

MANUAL

SINGER

Sewing

Machine

121D200A

1976

The

Singer

Company

Aii

Rights

Reserved

Throughout

the

World

Trademark

THE

SiNGER

COMPANY

Form

21624

(876)

Printed

U.S.A.

From the library of: Superior Sewing Machine & Supply LLC

LUBRICATION

Moving

parts

have

either

permanently

sealed

pre-lubricated

ball

needle

bearings

oil

Impregnated

bushings

which

require

manual

lubrication.

The

following

exceptions

are:

HOOK

An oil

reservoir

supplies

oil

the

sewing

hook

race

and

Is filled

through

the

oil

cup

shown,

until

the

word

"FULL"

seen

the

Indicator

window.

Check

oil level

Indicator

window

dally

before

starting

machine.

As oil level

decreases,

red

arrow

will

appear

(Fig. A).

Red

Arrow

Empty

(

H-

FIG.

From the library of: Superior Sewing Machine & Supply LLC

TEST

HOOK

LUBRICATION

Thread

machine

and

sew

yards

scrap

material.

Pay

attention

stitch

quality

amount

of oil

this

time.

Remove

material

and

bed

slide.

Run

machine

approximately

one

minute

establish

a,uniform

oil flow.

Without

stopping

machine,

hold a

piece

paper

place

under

hook

for

seconds.

Remove

paper

and

compare

oil

pattern

with

Fig. B

for

proper

oil flow.

•••

, " • # •

♦

•

FIG.

there

trace

of oil

excess,

adjustment

should

made

with

the

oil

metering

screw,

order

gain

access

oil

metering

screw,

the

hook

should

position

shown

in Fig. C. Turn oil metering

screw

clockwise

for

oil

and

counterclockwise

for

less

(Fig. D). Normal

setting

made

turning

metering

screw

to maximum in position

and

backing

out

2-1/2

turns.

Less

than

2-112

turns

may

required

for long

continuous

runs.

FIG.

Oil

Metering

Screw

Hook

Shaft

Bushing

Oil

Filter

Oil

FIG.

Oil

Metering

Screw

Less

Oil

From the library of: Superior Sewing Machine & Supply LLC

Ifoil flow is not satisfactory, remove hook assembly and oil filter. Check filter. Oil wick

should

replaced

whenever

has

become

clogged

with lint or dirt. An

excess

of oil

sometimes

indicates

that

the

filter

wick

has

become

detached

from

the

screw

the

screw

is not

securely

tightened.

Inspect

all oil

passages

see

they have not

become

clogged.

Oil

Filter

(S)

Hook

Assembly

From the library of: Superior Sewing Machine & Supply LLC

MACHINE

THREADING

Move

needle

highest

point

Lead

thread

from

thread

stand

through

thread

post

atop

machine

arm

Through

eyelets

thread

guard

Units

with

U.T.T.,

through

pretensioner

Down

through

thread

retainer

Into

and

around

tension

assembly

Over

check

spring

and

under

slack

thread

regulator

and

through

thread

retainer

and

take-up

eyelet

Down

through

thread

retainers

(2)

10.

Through

needle

bar

thread

guide

11.

Through

needle

eye

from

left

right

From the library of: Superior Sewing Machine & Supply LLC

STITCH

LENGTH

The

stitch

length

can

regulated

while

the

machine

\s^'m

operation.

obtain

the

desired

stitch

length

forward

feed,

turn

regulating

thumb

screw

oil

pan

"In"

(coun

terclockwise)

for

stitches

per

Inch,

and

"out"

(clockwise)

for

less

(Fig. B).

adjust

the

stitch

length

for

reverse

feed.

It Is

necessary

that

the

reverse

stopping

block

properly

positioned.

This

done

loosening

the

lock

screw

the

stopping

block

and

sliding

the

slide

block

down

the

desired

stitch

length.

The

locking

screw

must

then

retlghtened

(Fig. A).

Forward

Reverse

-0

Locking

Screw

FIG.

PRESSER

FOOT

PRESSURE

The

pressure

the

material

should

light

possible

while

still

sufficient

ensure

correct

feed

ing.

There

are

two

regulating

screws

that

control

the

presser

foot

pressure.

One

atop

the

arm

and

one

the

rear

the

machine.

The

one

atop

the

arm

the

major

control,

normally

adjusted

prior

long

pro

duction

runs

new

applications.

For

day-by-day

casual

adjustments,

the

regulating

screw

the

rear

used,

screwing

for

less

pressure

and

unscrew

ing

for

pressure.

When

this

rear

screw

unscrewed

all

the

way

out.

disengages;

only

then

can

the

top

screw

applied,

and

serves

the

sole

control

until

the

rear

screw

again

turned

ward

(Fig.

C).

Less

FIG.

Regulating

Screw

when

Screw

Disengaged

Regulating

Screw

From the library of: Superior Sewing Machine & Supply LLC

HOOK

TIMING

Proper

clearance

between

needle

and

hook

point, re

quires

that

the

point

the

hook

shouid

pass

the

nee-

die

closely

possible

without striking or

deflect

ing it.

There

shouid

.003

.005

clearance

bet

ween

the

two

(Fig. A).

adjust

clearance,

loosen

bushing

set

screw

(Fig.

B). With

screwdriver

placed

shown

move

entire

hook

and

bushing

(Fig. C).

Tighten

bushing

set

screw.

Hook

Bushing

Set

Screw

FIG.

Insure

that

the

needle

guard

prevents

the

needle

from

contacting

the

hook

point

any

time. If

large

needles

are

used

may

necessary

string

the

needle

guard

back

to allow

hook

point

closer

needle

(Fig. D).

.003

•

.005

Rat

Hook

Point

Needle

FIG.

Needle

Guard

FIG.

From the library of: Superior Sewing Machine & Supply LLC

HOOK

TIMING

CONT'D

Reset

position

finger

there

.018

.022

thread

clearance

between

finger

and

basket

(Fig. E).

^.018"

.022"

FIG.

Loosen

hook

set

screws.

Turn

hand

wheel

direction

rotation

until

needle

bar

the

rise

stroke,

and

the

lower

mark

aligned

with

the

needle

bar

height

indicator.

Set

hook

point

the

center

line

the

needle

(Fig. F).

Tighten

hook

set

screws.

Needle

Bar

Height

indicator

FIG.

Hook

Point

Centeriine

Needle

From the library of: Superior Sewing Machine & Supply LLC

TIMING

FEED

LIFTING

SHAFT

ARM

SHAFT

Manually

rotate

arm

shaft

until

timing

mark

counterbalance

aligns

with

timing

mark

take-up

stud

connecting

link (Fig. A).

Timing

Marks

FIG.

Loosen

bed

shaft

timing

belt

pulley

set

screws

(Fig. B).

Hold

pulley

stationary

and

rotate

bed

shaft

until

timing

mark

feed

bar

end

shaft

aligns

with

timing

mark

casting

(Fig. C).

Timing

marks

alignment

in Fig. A

and

Fig. C

must

occur

simultaneously.

Tighten

pulley

set

screws.

Set

Screw

(2)

FIG.

]

Q) ®

Timing

Marks

FIG.

From the library of: Superior Sewing Machine & Supply LLC

FEED

DOG

SETTING

Centrally locate feed dog in throat plate slots. Feed dog must not make contact with

throat

plate,

noted. Align by loosening

feed

dog

screws.

Then

retighten

screws

Fig. A.

Feed

Dog

Contact

FIG.

LATERAL

SETTING: Loosen pinch screw infeed bar crank

(Fig.

B).Shift feed bar

quired. Ensure that feed bar does not contact position finger.Tighten pinch screw and

check

axial play at pendant link. Adjust feed lifting shaft to minimize play.

Leveling

Eccentric

Feed

Bar

Crank

Pinch

Screw

Height

Eccentric

and

Locking

Nut

FIG.

Leveling

Eccentric

Set

Screws

From the library of: Superior Sewing Machine & Supply LLC

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