Brother T-8421A, T-8422A User Manual

From the library of: Superior Sewing Machine & Supply LLC

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Ga1.

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....

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.....

..

...

..

...

..

56

Ga2.

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67

From the library of: Superior Sewing Machine & Supply LLC

Notes for using this parts book

1.

This book was prepared based on information available in May 2004.

2. Parts are subject to changes in design without prior notice.

3.

Parts supplied as complete assemblies are circled

by

a dotted line

L.

....

..

.

..1.

4.

If

the

symbol*

is found in

the"

Parts No." column, refer to the different parts lists,

gauge parts list on page 54 -66.

CONTENTS

A.

Machine body . . . .

..

. . . . . .

..

. . . . . .

..

. . . . . .. ..

..

. . . . . .. . .

.. ..

. . . . . . .

..

. . .. .. . . . . .. . . . . . . 1

B.

Upper shaft mechanism .

..

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

..

...

..

................ .. . . .. 3

C. Needle

bar

rocking mechanism ...

..

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

....

...........

..

......

..

.. 5

D. Presser foot mechanism ...

..

.

..

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

..

................... .. 7

E.

Feed mechanism ..................................... ......................... ...

..

9

F.

Quick reverse mechanism

..

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

.. ..

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

11

G.

Quick reverse switch mechanism . .. . .

..

. . .

..

. . . . . . . . .. .

.. ..

. . . . . . .

..

. . . .

11

H.

Feed shaft mechanism...

..

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

13

J1. Rotary hook mechanism (T-8421A) .

..

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

15

J2. Rotary hook mechanism (T-8422A) .......

..

........

..

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

19

J3. Rotary hook mechanism . . .

..

.. . . . .....

.. .. ..

. .

.. ..

. . . . .. . .

..

. ....

.. ..

.

..

. .

..

. . . 23

K.

Gauge parts . . .

..

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

..

. ..

.. ..

..

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

.. ..

.

..

. . ..

..

. . . . . .. ..

..

. . 23

L.

Lower shaft mechanism ... . .

.. .. ..

.

.. .. .. ..

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

..

. ..... ..

.. ..

........ 25

M. Tension release mechanusm (T-8422A)................................ 25

N.

Lubrication .......................................

..

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

27

P. Threading

mechanism.

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

31

Q. Bobbin winder mechanism . ..

..

....

..

....

.. .. .. ..

. . . .

..

.... ... . ...

.. ..

. . .

..

. . . . 33

R.

Thread trimmer mechanism...

..

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

..

35

S.

Thread wiper mechanism (T-8422A) ..................................... 37

T1. Control

box

& motor mechanism .............................. ........... .. 39

T2. Control

box

mechanism .

..

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

..

.....

..

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

.. .. ..

. . . . .

..

41

U.

Power supply equipment mechanism .

..

.. .... .. .

.. .. ..

....

..

.....

..

45

V.

Presser foot lifting solenoid set mechanism (Option parts)....

47

21 . Accessories .........

.. .. .. ..

.

..

.

.. ..

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

.. ..

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

.. ..

.

..

. 49

22

. Accessories...............................................

..

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

51

Wa. Warning

labels..

..................................................................... 53

Sp. Different parts list.................................................................. 54

Ga1. Gauge parts list (T-8421A) .................................................... 56

Ga2. Gauge parts list (T-8422A) .................................................... 63

Index........

..

...........

..

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

..

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

..

.................... . 67

From the library of: Superior Sewing Machine & Supply LLC

A .

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T-8421A/8422A-109

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12

From the library of: Superior Sewing Machine & Supply LLC

13

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ifbtlt

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SA2546001

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1

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SOCKET

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ARM

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T-8421A/8422A-211

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From the library of: Superior Sewing Machine & Supply LLC

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PIPE

3

SA4029001 1

Mi!

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tub

ff U

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4

S09260001 1

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4>

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4X4

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15

012500536

1

;JfJ

M5X5

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SCREW,

SOCKET

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M5X5

16

S38212001

1

~!ltf;i

OPENER

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(

ffU.lfJ)

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ASSY

21

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(FT)

M6

22 SA2575001

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M6

SET

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(FT)

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23

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M6

25

SA3054001

1 mlll L

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WASHER.

L

26

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UL

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27

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PAN

M4X6

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#

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29

062400616

1

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M4X6

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M4X6

30

SA4012001

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FELT

31

SA3894001

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FELT

SUPPORT

32

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M4X6

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M4X6

-----

-

---

---------------

--

-

--

-----------------------------------

-------------------------------------------------------

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SA2757101

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33

SA2951101

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2

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HOOK

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A

1.

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ow

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RING<

t=1.0

>

4

S09261001

1

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m

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B

1.

4t.N

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>

5

S07420000

1

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NEEDLE

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6

S07419001

1

Jti1JIII

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RING

7

SA2557001 1

M!Ul$1bff

D

ROTARY

HOOK

SHAFT

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8

SA3856001

1 ~!ltfiliiff

OPENER

LINK

9

SA3859001 .

1

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~!l

tf;ijiff

tub

SHAFT,

0-LINK

11

025710132 1

.iJ'-mlll

S4.

76

WASHER.PLAIN

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12

021500316 1

1'ffl!llflt

MS

NUT

,

3M5

13

SA3889001 1

~

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tf;iff~tub

0-LEVER

SHAFT

14

SA4026001 1

im!l

4X4

L=

100

WICK,

4X4

L=100

15

012500536 1

tlfl

M5X5

SET

SCREW

,

SOCKET

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M5X5

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154965001

1

t.lfl

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SOCKET

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T-8421A-301

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From the library of: Superior Sewing Machine & Supply LLC

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(T-8421A) / Rotary hook mechanism (T-8421A)

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NAME

OF

PARTS

RM

34

SA2563101

1 ME~~Hi~ R

ROT

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HOOK

BASE

COVER

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M3X6

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PAN

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SA2572001

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ASSY

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SA2574001 2

!l'«fl

M6

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(FT)

M6

22

SA2575001

1

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M6

SET

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(FT)

M6

23

SA2576001

1 A!¥1!t~ffl#

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GEAR

SCREW

ASSY

24

SA2575001

3

•n

M6

SET

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(FT)

M6

35

SA2579001

1

UHi!

SPECER

36

SA4043001 1

fdl

fgffl

f-1:

UR

FELTURASSY

27

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M4X6

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PAN

M4X6

37

SA4045001

1

id!

fgffl

f-1:

DR

FELT

DRASSY

29 062400616

1

•n

M4X6

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PAN

M4X6

30

SA4012001

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fdlfg

FELT

31

SA3894001

1 fdlfg~

FELT

SUPPORT

32

062400616 1

t'«fl

M4X6

SCREW,

PAN

M4X6

---------

---------------

--

-

..

--

-----------------------------------

-------------------------------------------------------

-

--

-

38

SA3988001

1 ttal~~Hiii\i

FL

ROTARY

HOOK

BASE

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FL

39

SA3916001

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FR

ROTARY

HOOK

BASE

COVER,

FR

40

SA2825001

4

•n

M3X12

SCREW,

M3X12

41

SA2556001

2

t'«fl

M6X25

SCREW,

M6X25

42

115947001

2

.m111

6.

35

WASHER.

PLAIN

6.35

43

SA2722001

2 ffff A

PINCH

SLEEVE

A

44

SA2565001 2 ffff B

PINCH

SLEEVE

B

45 SA2556001

2 t'«fl

M6X25

SCREW,

M6X25

46

SA2567001 2

il!lit.

NEEDLE

UPPER

POSITIONING

PLATE

47

SA2568001

2

if!Jit*dl

NEEDLE

UPPER

POSITIONING

SHAFT

48 062061016

4

Qlfl

M6X10

SCREW,

PAN

M6X10

49

025060136

4

312-_m

l!)

S6

WASHER

,

PLAIN

S 6

50

S01928151

2~;:;

BOBBIN

<jiMfh

ffl

-=f

=1cidlffl•ffl

<OPTION PARTS>For dry type

51

SA2827001

2 ~Hl~iiffffl

f-1:

OPENER

LINK

ASSY

52

SA2558001

2

~H1W~iiff

OPENER

LINK

53

S58900000 2

t'«fl

M2

SCREW,

M2

54

062400416

2

•n

M4X4

SCREW,

PAN

M4X4

T-8421A-301

18

From the library of: Superior Sewing Machine & Supply LLC

J2.

MUI~

(T-8422A) / Rotary hook mechanism (T-8422A)

19

"~J!t.11tj:

/ OPTION

PARTS"

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65

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61

T-8422A-301