Brother LT2-B830 Service Manual

e

..

-~·~

.a:.~-'...L=

......

.

CONTENTS

[Model

8831 · 8832 · 8835 · 8836 · 8882]

NAMES

C

(SPECIFICATIONS)

OF

MAIN

PARTS).............

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

(MECHANISM)...........................

[]Upper [!)Needle [!] [!]

III

[I) Tension releaser mechanism

[II

(!]Thread

[!J

@)Top feed mechanism types

shaft and needle bar mechanism . . . . . . . • 5

feed mechanism . . . . . . . . • . . . . . . . . . . . • . 5

Lower shaft and rotary hook mechanism . . . . . . . 6

Feed

mechanism . . . . . • . . . . . . • • . . . . . . . . . . . . . . . 6

Thread trimmer mechanism . . • • . . . . • . . . . . . • • . . 7

...............•

Reverse mechanism . . . . . . . . . . • . . . . . . • . . . . . . • . 8

wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Needle bar (left and right) mechanism types 8835

and

8836 . .. . ..

..

.. . .. ..

883

7 and

..

8838

. .

.. . .. . ..

DISASSEMBLY PROCEDURES 11

B831,B832,B835,B836,8882

[]Cover

[1]

[!]Thread [!]Rotary

III

[!]Needle

[II

. • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Presser mechanism . . . . . . . . . . . . . . . . . . . . . . . . . .

wiper . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . • 12

hook. lower shaft and thread trimmer mechanism .

Reverse mechanism . . . . . • . . . . . . • . . . . . . . . . . . . •

bar rocking shaft mechanism . . . . . . . . . . .

Reverse switch mechanism . . . . . . . . . . . . . . . . . • . 1 5

• . . . . . . . . . . . . • • . . . 12

Page

;.

10

11

14 15

1

STANDARD

ADJUSTMENTS . . . . .

25

B831,B832,B835,B836,B882

lil

Needle and feed

5

7

(1]

Adjustment

(Models [!]Needle [!]

Rotary hook to needle plate gap . • . . . . . . . . . . . . .

II]

Rotary hook to bobbin case opener gap . • • . . . . .

[!]Presser foot height adjustment . . . . . • . . . . • • . . . .

[II

Feed (!]Tension [!]Stitch

(!ID

Reverse feed soleno1d adjustment . . . . . . . . . . . . .

8831.

and rotary hook timing adjustment • . . . . .

dog height adjustment

release adjustment . • . . • . . . . . . • • . . . . . .

length adjustment . . . . . . . . . • • . . . . . . . . . • .

[ill Thread wiper adjustment . . . . . . . . . . . . . . . . . . . . .

9

lliJ

Slider adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .

[!!]Movable and fixed

IE)

Knife mam lever roller . . . . . . . . . • . . . . . . . . . . . . . .

ffi)

Knife drcving lever adjuStment . . . . . . . . . . . . . . . . .

@]

Position detector adjustment . . . . . . . . . . . . . . . . . . 43

ill)

Corner sewmg (8835.

[!!]

Timmg belt replacement • . . . . . . . . . . . . . . . . . . . . . 4 7

8836)

t1mmg

(8831)

of

needle bar to presser bar gap

8832.

8835.

kn1fe

adjustment . . . . . . . . . . . .

pos1t10n

.. . ..

adjustment

. . .

.. . .. .. ..

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

8836.

8882)

..

. . • • . •

..

. . .

. . . . .

..

. . . .

..

.. . .. .. ..

25

28 29 31 31 32 33 34 35 36 37 39 40 42 42

43

(ASSEMBLY

[]Needle

[1]

Lower shaft. thread trimmer and

rotary hook mechanism . . . . . . . . . . . . . . . . . . . . .

[!]

Presser mechanism . . . . . . . . • . . . . • . . . . . . . . . . . •

[!]Thread

(1]

Reverse switch mechanism . . . . • . . . . . . . . . . . . . .

[!]Reverse mechanism . . . . . . . . . • . . . . . . . . . . . . . • . .

[II

Cover • . . . . . . . . . • . . . . . . • . . . • . . . . . . . . . . . . . . . . .

bar rocking mechanism . • . . . • . . . . . . . • . . 16

wiper

PROCEDURES)

.......••.....................••

...........

• .

16

16 21 21 23 23 24

\/

CONTENTS [Model

8837 · 8838]

DISASSEMBLY PROCEDURES

......

B837,B838

[I) Cover . . . . . . . . . . • . . • . • • . . . . . . . . . . . . . . . . . . . . . .

[!]Tension

[II

Presser foot and walking bar . . . . . . . • . • . . . . . . . .

fl]

Needle bar and needle thread take-up . . . . . . . . .

[I]

Feed

(ASSEMBLY

[I)

Feed

[!]Needle

[II

Walking bar and presser foot . . . • . . . . . . . . . . . . . 53

fl]Tension [!]Cover

STANDARD

release lever . . . . . . . . . . . . . . . . . . . . . . . . .

assembly . .

assembly . . . . . . . .

bar . . . . . . . . . . • . . . . . . . . • . • . • . . • . . . . . • • 52

release lever

.•...•....•..•...•.•..•••..............

..

. . . . . . • •

PROCEDURES)

..

. .

.. ..

. .

..

...........

..

. . . . . . • . . . . . . . . . . . . . . 52

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

ADJUSTMENTS ..

. . .

..

.. ..

. . ..

B837,B838

Page

48

48 49 49 51 51

52

57 58

59

GAUGE PARTS LIST DOUBLE NEEDLE

FOR

LOCK

STITCH

SEWING MACHINES

(OTHERS).................................

[I) Top cover thread guide

[!]Adjusting

[II

Anti-spinning spring fl]8obbin ITlTo thread bobbin cases (8835.

upper thread length • . . . . . . . . . . . . . . . • 75

......................•......•........

(TROUBLESHOOTING

.. • .. .. .. • .. .. ..

.. . .. . ..

..

8836)

GUIDE)

• . .

..

_,

.....

.. . ..

. . .

.. . ..

........•

.........

..

. 76

67

75

76 76

77

[I) Needle and feed timing adjustment (standard) . . 59

[!]Feed

[II

fl]

11]

[!] Presser foot height adjustment . • . . . . • • . . . . . . . .

II] II]

1IJ

[!ID

dog adjustment m back and forth

directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Needle and rotary hook timmg adjustment . . . . . .

Clearance between rotary hook and

needle plate . . • . • . . . . . • . . . . . . . . . . . . . . . . . . . . . .

Clearance between rotary hook and

bobbin .case opener . . . . . .

Feed

dog height adjustment . . . . . . . . . . . • . . . . . .

Vibrating presser foot and lifting presser foot

and

needle timing adjustment . . . . . . . . . • . . . . . . •

Upper feed adjustment Vibrating presser foot and lifting presser foot

vertical stroke adjustment . . . . . . . . . . . . . . . . . . . . .

• . . . . . . . . . . . . . . . . . . . 62

..

. • •

..

. .

.. .. . ..

. . . .

.. . 65

60 61

62

63 64

65

66

( NAMES

OF

MAIN PARTS )

< M odel LT2-B831 >

Mod

el

<

LT2-B832

Ll2B831

Use

Sew1ng

speed Sutch length Presser foot

he1ght Feed

dog he1ght

Needles

>

LT2-B832

Us

e

Sew1ng

speed

Stitch length Presser

fo

he1ght

f---

reed dog

Presser foot lifter

ot

Knee lifter 7 mm

he1ght

- 1

for

thon

matenals

4000

-1

For th1n

matenals

For

med1um-

th

matenals spm

0-4

mm

7 mm

1

DP X 5

For med1

matenals

4000 spm

0-4

mm

7

1 mm

3

iCk

mm

- 3

thi

Ck

mm

um-

-5

For

th1ck

matenals 3000

spm

0-5

mm

-5

For t

h1ck

matenals

3000

spm

0-5

mm

<

Model

LT2-B882

es

Needl

>

Use Sew1ng speed

St1tch length Pre

foot he1ght

Feed

Needles

DP x 5

LT2

-8882

Presser foot

sser

l1fter Knee lifter 12 7 mm

dog

he1gh

t

DP x 5

DPx5 # 1 1 DPx5 li

-3 -5

med1um-t

For

matenals matenals

Q-7

mm

DPx

51i

14

DPx5

h1ck

3000 (Spec1al order 8mm)

7

10

14

spm

mm

Fo

r t

h1ck

DP X 5fj 22

li22

_, _

<

Mod

el LT2-

B835

B836

>

LT2-B835

Use

speed

Sewtng Stnch

length

Presser foot hetght

Feed dog hetght 1.0 Needl

es

LT2-

B836

Us

e

Sewtng

speed

Sutch length

Presser

Presser foot hetght

Feed d

Needles

og

foot

lifter Knee lifter 16

hetght

medtum-lh

For

matenals

med

For

matena

- 3

3000

- 3

turn-thtck

ls

3000

105

DP X 5

1.0

DP

tck

5 rnm

7 rnrn

mm

8

mm

X 5

spm

mm

5

ro

r thtck

matenals

- 5

For thtck

matenals

<

Mod

<

Model

el LS2-B837

LT2-B838

>

U

se Sewmg Max. stttch l Presser

he1ght Feed

dog

speed

ength

foot

he1ght

!Presse r !

Knee

lifter

foot

l1f

ter

Needle

>

Use

w111

g speed

S e Max .

StitCh

length

l

ift

Pr

esser

he1ght Feed d

N

eedle

foot lPresser

IK

nee l1fter

og

he1ght

foot

er 10

LS2 -

For th1

3000

10

DP X 17

L th1

For

3000

B837

ck

mat

spm

8

mm

.5

mm

16

mm

1.0

mm

T2-B838

ck

mater

spm

8

mm

.5

mm

16

mm

1.0

mm

DP X 17

ena

ls

1als

- 2 -

< LT2-B832-

<

LT2-BB35-400A

400A

>

M

otor

POWI:R

B

ACK

>

START

ON ON

@ @

OFF OFF

TACK

END

REPEAT

ON

@

OFF

~

NFEOLE

POSITION

UP

@

OOWN

S

E'MNG

SPEED

,.

....

~

(~'

~

lOW

HIGH

S2-B837-300A

< L

I

r--"YI

Control box assembly

'Ej

SEWING SPEED

~----~

(M:

L

>

OW

Speed c

ontr

HIGH

ol

VR

-3-

Treadle

unit

Ill

Motor

Med1um

Machine

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

Motor

Belt Cover

Treadle

Control Box Assembly

Thick

pulley

speed

Pulley

Unit

Size

Part No.

#No.

Part No.

#No.

Part No.

v

Part No.

LT2

50

Hz

1

20

Pulley

224545-000

#12-2

22454

7-001

224396-038

110/220V

226531-001

-B832

4000

#5-38

-403A 703A

spm

105

226389-000

226393-001

100/200

•

226426-001

60Hz

Pulley

#1

2-1

v

L

T2

50

Hz

105

Pulley

226389-000

226393-001

224396-030

110/220

226531

-002

-B83

3000

v

5-403A

I

spm

l

#12-1

#5-30

•

703A

60Hz

90

Pulley

224506-001

100/200

226426-002

v

LT2-B832-405A

50

Hz

Machine

----------

Motor

Belt Cover

Treadle Control Box

Assembly

• When ordering a motor single or three phase.

• Parts in the above table

• Machines dealer.

•

Be

(2)

speed

Pulley

Unit

Size

Part No.

#No.

Part No.

.#No.

Part No.

v

Part No.

be

sure to specify the sewing

are

and

motors for voltages other than those specified above can

sure to refer to the parts book when ordermg any parts.

Motor

pulley change

105

226389-000

110/220

226531-002

for both smgle and three phase machines.

3000

Pulley

226393-001

224396-030

v

I

spm

I

#1

2-1

#5-30

•

mach1ne

705A

60Hz

90

Pulley

224506-001

100/200

226426-002

v

model number. intended matenals to

be

*

Use

the V-belt included together with the machme head. After installing the belt. loosen both hexagon nuts

0.

and adjust the that the correct tighten the hexagon nuts.

• The belt can

50

105

226389-000

110/220

226531-002

manufactured

be

depressed about 10 mm

LT2-B835-405A

LS2-B837

Hz

Pulley

I

3000

I

#12-1

226393-001

#5-30

224396-030

v

•

to

order. Consult your local

tens1on

belt tension

705A

-300A 60Hz

spm

90

Pulley

224506-001

100/200

226426-002

be

used. and either

of the belt. Make sure

is

mamtained. Then

v

w1th a f1nger.

-4-

""- 1

l'

J.

.c,

~

J-.

J-\. 1

''U,::,

[I]

UPPER

I

When

2 The

shape

wh1ch

SHAFT

pulley 0 t

motion

of 1s

connec

arc

1S

motion

AND

urns

conveyed

ted to need

3 Needle bar 0 moves

4 Needle bar 0

(The

arc

connec

ted

motion

to

needle bar

IS

gu1ded by needle bar

1s

conveyed

rn

)

NEEDLE

m the

arrow

to

needle bar

1s

conveyed to the thread

le

up

and

crank

BAR

d1rect1on. Its rotatm g

crank

bar

crank

rod

down

v1a

needle

support

to

the thread

rod 0 l

MECHANISM

rod 8v1a

hole

needle bar

1n

0

bar

clamp

0

hole

m thread take-

motion

thread tak

IS

0 wh1ch

up

--

conveyed to

crank

O wh1ch

e-up

lever ~ v1a

IS

connected

lever ~ v1a

---

--~.r

upper

shaft

f)

to

1s

connected

thread take-up lever sl1de

to

needle bar crank

thread take-

up

lever slide

turn

to

counter

----

counter

we1ght 0 The

rod

block

0

@

we1ght 0 .

block

0

0 wh1ch

1s

[I) NEEDLE FEED

When

pulley

0 t

upper

0

2 The

3 Eccent

4 Level feed

5 The moti

6 Needle bar su

7 Needle bar

mouon

connec

IS

conveyed to

r1c

whee

arm ~ moves m the shape ol arc v

tmg

link

on

IS

conveyed

pport

fD

wh1ch

MECHANISM

urns

1n

the

l 0 wh1ch

O.

to

G)

mo

ves back and

IS

connec

arrow

d1rect10n. ItS

t1m1ng

belt

wheel lower

1s

connec

ted

needle bar

ted to needle bar s

rock

to

lower

forth

rotating

0 v1a

shaft 0 rotates v

1a

eccen

cran k

41)

VIa feed ro

VIa

needle bar rock

upp

motion

tlmmg

triC

ort

G)

IS

conveyed

belt 0

wheel

ck shaft

moves

to

1a

t1m1ng

belt wheel

0 . level feed

m.

lmk m and

back

and

upper

shaft

connectmg

needle bar

forth

.

f)

to t

urn

lower 0 and

rod 0 and

connec

ting

t1m1ng

lower

rod

belt

wheel

shaft 0

level feed

4D

- 5 -

[I]

LOWER

SHAFT

AND

ROTARY

HOOK

MECHANISM

1.

When

upper

2. The

3. As

4. Rotary

(Opener)

1. Open

2. Op

IT]

moti

lower shaft 0 which

ener

• The

FEED

pu

lley 0 turns in

0 .

on

is conveyed

h

ook

~

rotates via pini

er

crank

41)

move

4D

which

LS2-B837

MECHANISM

s in the

is conn

sewing

th

e ar

to

tim

is

connec

ected

machine

______=::~~

row

direc

tion. its r

ing

belt

wheel

ted to

on

gear 0 which

shape

of

to

opener crank

does not contain a left side

----

ota

lower

tim

ing

belt

an arc via

41)

is

----~

ting

mot

0 via t

wheel l

connec

rota

ry

moves

---~

ion

is

conveyed

imi

ng

belt

ower 0 rotat

ted to rotary h

hook ~ and

in

the

shape

rotary

i

to

upper

sha

ft

f)

to

turn

timing

0 .

es. spiral ook

ope

ner

of

an ar

hook. etc. because of the one needle.

gear

base O.

link

$ .

c.

8 is turn

ed

.

belt

whee

l

1.

When

pu lley 0 t

upper

O.

2. The motion IS conv

3. Eccentric

4. Level feed connect

5. Feed bar

6. Feed bar fork

7.

The moveme

ing link 0 .

ur

ns in the

eyed

wheel 8 whi

arm

«!)

moves in the sh

41)

moves b

4D

moves

nt

of feed

to timmg

ch is con

ack

and

up

dog

arrow

directio

belt

nec

ape

forth via

and down

1s f1xed

by the comb

n.

its

rotating

wheel lowe

ted to

lower shaft 0 rot

of

an

arc

feed ro

ck

by vertical feed

r 0 via t

via

eccentric

shaft

inati

on

motio

tD

.

ecce

of

n IS

imi

ng bel t 0 .

ates via t

wheel

ntri

C w heel m whi

move

ments in

- 6 -

conveyed

imi

ng belt wheel lower 0 a

8 . level feed

to upper sh

Ch

IS

1tem

5 and 1tem 6.

aft

connec

f)

ting r

ted

to t

urn timi

nd

od

0 and level feed

to

lower

ng

belt

wheel

lower shaft

shaft o.

0 .

i

l

r

I

r

!

i

!

~.

~

IT]

THREAD TRIMMER MECHANISM

1.

When thread trimming signal comes from synchronizer. solenoid 8 direction.

2.

The motion

3.

As

knife main lever shaft 8

which According to the recess shape of knife driving cam

4.

8.

knife sub lever

The motion

5.

lever left Movable knife

6.

The movable knife

7.

is

conveyed to knife driving pin lever 8 via knife driving lever

is

pushed in the arrow direction. knife main lever roller 8 enters knife driving cam recess e

is

connected to lower shaft

0.

knife length adjusting link

is

conveyed to knife lock arm

G)

and knife lock arm shaft

0 which

is

connected to slider

8.

6)

G)

(left slider side).

e.

the motion

CD.

knife lock lever right

via knife link

fD

is

moved in the arrow direction.

4B

0 returns while the roller of knife main lever 8

e.

After returning movable knife solenoid 8

8.

is

OFF.

and knife main lever roller G

e.

is

ON

and plunger 8

8.

is

conveyed to knife lock arm

4D

and knife lock arm shaft

which

is

connected to knife lock lever right

is

being controlled

is

released from knife driving cam recess

is

pulled in the arrow

6)

via knife main lever

G)

(right slider side).

49.

knife lock

by

the shape of knife driving cam

I

.

I

l

J

I

~

[[]

TENSION RELEASER MECHANISM

When thread trimming signal comes from synchronizer. solenoid 8

1 .

direction. The motion

2.

As knife main lever shaft 8 is pushed in the arrow direction. tension release lock lever 0

3.

release cam portion of knife driving cam Roller of tension release lock lever 8

4.

cam8. The motion is conveyed to tension release crank

5.

lower As

tension release crank

6.

release plate When solenoid

7.

is

conveyed to knife driving pin lever 8 via knife driving lever

0.

tension release crank upper

G)

pushes presser bar lifter

fD

and pin.

8

is

OFF.

t'ension disc

8.

is

pushed in the arrow direction by tension release cam portion

G)

via tension release connecting rod lower

CD

tension release connecting rod upper

41).

tension disc 0 is moved via tension release bar

is

returned to its original position.

is

ON

and plunger 8 is pulled in the arrow

0.

is

connected

of

e.

tension release crank

4D

and tension release plate

with

tension

knife driving

8.

41.

tension

-7-

[I]

REVERSE MEC

HANISM

~0

1. The reverse solenoid 0 (ON) works by

2. The reverse

solenoid

plunger

0 begins

micro

to

0 . reverse link 0 . and reverse lever shaft arm G.

3.

Wh

en reverse lever shaft 0 rota tes. the

4. The

[!]

switch

(Movement

THREAD

assembly is

conveyed to switch assembly

«)

changes from forward

WIPER

Thread w1per soleno1d

switch 0

operate. and the

motion

is

conveyed to shaft

stitch

«)

via Switch arm

when

the signal actuat

mot

ton

is

conveyed to reverse lever shaft 0 via reverse crank

«!>

to backward stitch by the inclination

4f}

by

SWitCh

Afte r thread trtmmtng. w

ms. thread w1per solenotd 0

2 The thr ead w1per solenotd

1ts

v1a

orig

and R ltnk B 0 . and

3 In case th

to

or

bar 0 is pressed.

and feed regulat

connec

solenotd lmk 0 . thread wiper li

thr

ead

at

thread

tnal posttt

ting

w1per

wipe

on

or

arm

1th

the mterval of 1 0 - 1

f)

guide 0 .

r 1s

OFF.

wtth the

4D

lever 0 .

of

feed regulator

fD

).

1s

ON.

dr1ves

thread w1pers L

thread wiper returns

a1d

of

spnng

nk

G.

4!)

00

0 .

.

Thread

Thread w1per L

w1per R

-8-

l

[[]

NEEDLE BAR

(left

and Right)

MECHANISM

TYPES

8835

and

8836

I

J

I

(To Stop the Right Side Needle Bar)

1.

Move stop lever assembly 0 to the right side. (Push lever attaches to push lever

2.

Lever shaft arm 8 and slide shaft 0 are moved to the right side via lever shaft arm 8 which is attached to stop lever assembly

3.

The slide bearing board assembly 8 which fits in slide shaft 0 moves to the right side via collar 8 and bearing board spring

4. The pin which is attached to the tip of thrust bearing board assembly 8 moves sliding block operation shaft

side via moving crank

5.

Sliding block assembly

to sliding block operation shaft

6.

When the convex part

to needle bars

• When the left side needle

(Cancellation

1. When push lever

returned to its original position

2.

When stop lever 0 is returned to the middle position by lever shaft arm center position via slide shaft sliding block operation lever

3. The

clutch fits into needle bars fl) again.

4. Needle bar G) can

O.

0.

fl). the clutch in needle bar connecting stud

of

Needle Bar Termination)

release pin of needle bar connecting stud

f)

and stops.)

0.

48

is moved to the right side via sliding block operation lever

G).

of

sliding block assembly

is

caused to stop. the reverse sequence

f)

is

pressed. it becomes loosened from the convex part

by

lever shaft arm

0.

slide bearing board assembly

CD.

etc.

fB

41

be

raised and lowered.

f)

rises. and the convex part of the back

CD

which fits in the pin screw affixed

contacts the clutch lever of needle bar connecting stud

41

breaks away from needle

is

performed.

of

bar~.

the back side

s1de

of stop lever 0

and needle bar fl) stops.

of

stop lever 0 and is

CD.

spring&.

0.

moving crank

is

pushed by the convex part of sliding block assembly

sliding block assembly

0.

sliding block operation shaft

G)

41

fB

CD

to the left

attached

returns

G>.

and the

to

-9-

.,

[@]

TOP

FEED

MECHANISM

TYPES

8837

AND

8838

1.

When

mach i

ne

pulley 0

of

rotation

2. The top feed eccentric wh

3. Motion

4. Bell crank link

5.

Th

e top feed presser link 0 is

feed presser bar

6.

Middle By

loosening

7.

crank 0 is changed and alterati

top feed eccentric wheel 0 .

is conv

presser @ affixed to top feed presser bar

eyed to bell cra nk

f)

causes the up-

Q)

.

wing

nut

turn

s in the direction of the arrow. the rotation is conveyed to

ee

l crank 0 is moved in an arc by

f)

via

top feed shaft 0 which is affixed to t

down mot

gu

1ded by the

CD

and adjusting the

on

of the

10n

of

groove

position

amount

top feed presser link 0 via bell crank 0 .

Q)

of up-

top

feed eccen tric wheel 0 . via t

(oval) of middle presser gu1de

IS caused to move

of

hinge screw m. the

down

motion

of

up

and

middle

amount

upper

shaft 0 and causes the

op

feed con necting rod 0 .

op feed ecce

plate

down

presser @ becomes possible.

ntri

c wheel crank 0 .

~

and conveys mot1on to t

.

of

motion

of

top feed eccentriC

op

-

10-

~

UISASS.EMHL

Y .PKUC.EU

lJK.ES)

• These disassembly procedures are for model l disassembled on the basis of these procedures.

ITJ

COVER

Procedures

1.

Loosen thumb screw

2.

Remove two screws 8 and remove

3.

Remove bed

4. Loosen screw

5.

Remove two screws

6.

Remove two screws

7.

Remove two screws

slideR

0.

remove step screw 8 and washer

G and bed slide L

Cl)

and remove bed slide F

4B

and remove cover

CD

and remove synchronizer cover

41

and remove needle position detector G).

top

cover

0.

4]).

G).

0.

T2

-8832

-403A. Other twin needle lock stitch machines may

8.

49

and washer

and remove the face plate

(D.

8.

be

[]]

PRESSER MECHANISM

Procedures

1.

Loosen two screws 0 and remove two needles

2.

Loosen two screws 8 and remove thread wiper R 8 and thread

3.

Remove screw 0 and. after raising presser lift lever

4. Remove stud screw

5.

Remove two screws (tension release indicating plate.)

6. Loosen presser adjustment screw

7.

Remove presser bar lifter guide

8.

Loosen flat screws G) and remove presser bar

fJ)

guide

• Tension release shaft e disconnects when the machine

disconnect.)

CD

and remove knee lifter lever spring

48

and connecting rod knee lifting

0 and remove spring

8.

f).

8.

joint

G).

(Presser bar guide bracket

wiper

L

8.

remove presser foot

CD

and knee lifter lever

ball bearing

Cl).

is

turned over.

8.

Remove tension release connecting rod

0.

G).

fD.

presser bar lifter fl. and presser bar

CD

-11-

[!]

THREAD WIPER

trri-==f)~

c:====~~

.reD

c(~a.>

Procedures

1.

Remove thread wiper spring

2.

Remove plunger pin

-3.

Remove solenoid link

4.

Remove three flat screws 8 and remove thread

5. Remove four screws 0 and remove three cord braces

6. Remove

ffi

ROTARY HOOK, LOWER SHAFT

four

flat screws

O.

(1) Rotary Hook

O.

0.

thread

wiper

CD

and remove solenoid

assembly

AND

THREAD

0.

wiper

f).

Termrnal

.........

and rubber stopper

solenoid cover

0.

(Remove terminal pm

TRIMMER

MECHANISM

prn

0.

12-prn

Termmal prn Terminal

(black) (white)

from

the 12-p1n plug.)

plug

p1n

Procedures

1.

loosen

2.

Remove flat screw 0 and remove

3. Turn over the mach1ne.

4.

loosen

5.

Remove

6. Turn the mach1ne

7.

Remove screws 0 0 and remove movable

8. Turn the machme pulley and move the needle bar to the h1ghest pomt.

9.

Remove

10. Remove rotating hook

•

screw 0 and remove screw

three screws 8

two

thread cutter return

two

screws

(nght

upnght.

CD

and remove feed dog

fD

Be

sure not to confuse the

bobbin

and left screws).

spnngs

and spacer

right

and left rotary hooks

f);

then remove throat plate

case opener 0 and washer 0

0.

kn1fe

CD.

CD

(right and left).

fD

and spacers

-12-

0.

(nght

and

lef_t).

CD

when assembling.

(2) Thread Trimmer

lever

relurn

s~l~lf

-~~~~

fB~!

~~---•

C) A L

Procedures

1 . Remove two screws 0 and remove tension release connectmg rod

2. Remove tension release return spring

3. Turn the machine over. ball

joint

4. Remove two

5. Remove two ball joint stud screws 0 and remove length adjustment connecting bar assembly

6. Loosen screw 8 and remove pin lever 0 (shaft and forked lever).

7. Loosen screw

8. Loosen screw

spring). and rubber

9. Remove two flat screws

(Remove the prn terminal from the 12-prn plug.)

41)

with

stud screws 0 and remove connecting rod assembly

and remove sub lever shaft

hole$

and remove main lever shaft fl. tension release moving assembly e (main lever return

Gl.

4D

and remove thread tnmmer solenoid

0.

fD.

8.

(D.

0.

.

-~

:

-~

fB

~(@

T ermrnal prn

12-prn plug

T ermmal pm (whrte)

(black)

8.

(3) Lower Shaft

Procedures

1.

Remove

2.

Remove switch mechanism sprrng

3.

Remove screw 0 and remove spring peg

4.

Remove flat screw 0 and remove feed bar fork 0 and washer

5. Loosen screw 8 and remove set screw

6. Loosen two screws

7.

Loosen three screws

8. Loosen screw

9. Loosen screw G) and two screws

10. Remove three screws

11. Remove lower shaft 1). (At this time pinion

driving cam

• Place pinion G) and spiral gear

t1mrng

belt

8.

41).

fD

8.

fl. and spiral gear

G.

O.

f).

(nght and left)

e.

and remove timrng pulley 0

fD

and remove beanng presser

G>.

f1

disconnect.)

fi

in therr respective rotating hook positions.

vertical feed eccentric wheel fl. horrzontal eccentric wheel

fD.

8.

Gl.

(Be

sure not to misinsert them.)

fD.

knife

-13-

L

(4) Thread Trimmer and Rotary Hook

Procedures

1.

Loosen screw 0 (right and left).

2.

Remove screw

3. Loosen screw 8 and remove set screw 8 (right and left).

4. Remove lever L assembly 0 (moving shaft) and remove rocking arm

5.

Remove lever R assembly 0 (moving shaft) and remove rocking arm

6. Turn the machine upright.

7.

Remove two flat screws 0 and remove slider assembly

8.

Turn the machine over.

9. Loosen two screws

10. Remove rotary hook

f)

and remove washer 0 (right and left).

4D

and screws

baseL

fD

and ~-and raise feed bar G) forward.

49

and then rotary hook

4D

(nght and left).

base

R

CD.

8.

f).

[[]

REVERSE MECHANISM

12-pm

Procedures

1.

Turn the machine upright.

2. Remove screw

3. Remove stud screw

4. Remove three flat screws 8 and remove reverse solenoid bracket

5.

Remove the pin terminal from the

0 and remove reverse solenoid cover

0.

12-pin

plug.

f).

plug

8.

Term1nal

Terminal

pm

(black)

(wh1te)

-14-

[II

NEEDLE BAR ROCKING SHAFT

Procedures

1. Remove

2. Loosen screw

3. Loosen screw 8 and remove thread take-up shaft 0 while raising the tip of oil regulator reservoir

4. Remove thread take-up lever

Insert a wedge to needle bar rocking connecting bar 0 and remove needle bar rocking shaft assembly

5.

two

flat screws 8 and remove side plate

f).

8.

MECHANISM

Thread take-up lever

f).

(The thread take-up lever slide block disconnects.)

0.

[I] REVERSE SWITCH

MECHANISM

Term1nal pin (black)

Procedures

1 . Loosen flat screw 8 and remove actuator bar

2. Remove

3. Remove two screws 0 and remove micro switch

4. Remove the terminal pin from the

two

flat screws 8 and remove micro switch case 8 and washer

12-pin

f).

plug.

-15-

T ermmal pin

0.

(wh1te)

l ASSEMBLY PROCEDURES)

OJ

NEEDLE BAR

Procedures

1 Make

2

the

Alter

placmg

• Place needle bar

3 Install thread take-up lever 0 to thread take-

4. Install

stud 0 wnh

• Insert stud 0 by l1ftmg

ROCKING

w1ck

0 he slack

the needle bar

crank

screw

MECHANISM

on

the

bottom

rockmg

rod 0 onto

shaft

0 .

t1p

of

oil

reservo1r

of

the

f)

m

the

needle bar

up

arm

oil groove.

arm. 1nsert mto needle bar

crank

0 .

lever slidmg

block

0 .

rockmg

connectmg

rod

O.

ITJ

LOWER SHAFT,

(1)

Lower

Proc

edu

1. Turn the

2.

Install rotary

• Install ro t

3 Insert feed bar 0 between rotary 4 Install honzontal teed

• Install

Shaft

res

machme

homon

(Part

hook

at1ng

tal feed sha

THREAD

One)

over

base R 0

hook

and

bases 0

shalt 0 w1th two

lt 0 w1t

TRIMMER

then rotary

and

f)

w1thout t

hook

bases 0

screws 0 .

h screws 0

AND

hook

ROTARY

base L

he

felt prot

and

f)

so

that there 1s

HOOK

f)

.

rudmg

MECHANISM

.

no

lelt-nght

play.

-16-

Lower Shaft (Part Two)

Procedures

5.

As

shown

1n

the diagram. place the lower shaft m

horizontal eccentric wheel

6. Fasten bearing presser

7.

Install

timing

pulley 0

• Tighten screw

8.

Install knife driving cam

• Tighten set screw ~ to screw seat

9. Install horizontal eccentric wheel 0

• Tighten screw

1 0. Install vertical feed eccentric wheel

• Tighten screw

G)

41

CB

Cl).

spiral gear

4D

with screw

f»

to lower shaft 0 with screw

to screw seat of lower shaft O.

f)

to lower shaft 0

in front of lower shaft 0 rotating

to screw seat.

1ts

bed and 1nstall

C).

vertical feed eccentric wheel«!). and Spiral gear

1n

the followmg sequence: knife driving cam

0.

G)

and

screw$.

with

set screw

of

lower shaft 0 and then fasten screw 0).

with

two

screws

«!>

w1th

screw

CB.

Cl).

d1rect1on

4D

and screw 0).

to the screw seat

C)

onto

lower shaft

f).

0.

~

(2) Thread Trimmer

Procedures

11

.

Turn the machine upright.

12.

Install slider assembly 0 to rotary hook bases e and 8 With

• Verify that slider assembly 0 operates smoothly (right and left).

13.

Turn the machine over.

14.

Insert lever L 0 and rockmg arm shaft 0 to rotary hook base

0.

screw

15.

Insert lever assembly R «!)and rockmg arm shaft 0

0 and screw

16.

Temporarily fasten rotary hook bases 8 and 8

17.

Insert feed bar fork

18.

Place pinion

19.

Place rotary hooks G) (spacer) on rotary hook bases 8 and 8 and

0)

and

f).

G)

into

grooved portion

Rotary Hook

to

rotatmg hook base

with

to vertical feed eccentric wheel

of

rotary hook bases 8 and

fD

spacen~

fJ)

two

flat screws • (nght and left).

8.

and install rockmg arm

screw 0 and washer 0 (nght and left).

G)

and install with flat screw

0.

pinion

-

..

spacer

~

Cfj

f)

8.

and mstall rocking arm

41

and washer

0). and then temporarily fasten

with

set

f)

screw

with

~.

with

0 and

set screw

screw

••

Temporarily fasten feed

20.

dog

~with

two

screws

f».

-17-

Ill

Feed

Dog Position Adjustment

Procedures

1. Set the feed adjustment dial to 0. (This sets the feed amount to zero.)

Install throat plate 0 with screws 8 and

2.

3. Install needle Gin needle clamp 0 with screw

4. Place presser bar 8

5. Turn the machine over.

6. Loosen four screws opening of throat plate

tii).)

shaft

7. When feed dog 0 is at its highest position. loosen screw

0 surface is 1 mm for medium-thick materials and

plate

8. Holding the distance of

posit1on where the tip of needle 0 enters the center of feed that order.

• Fasten screw

Adjust to 14.2 mm m step 0 above

•

into

jaw

part of arm.

0 and adjust with the horizontal feed shaft

0.

(After adjusting. fasten securely with screws 0

13.5

mm

between needle

fl

when the needle bar rocking crank 0

8.

w1th

G.

bare

models

tii>

fD

and adjust with feed bar

1-1

.2

mm for thick materials. (Fasten screw

and presser bar

dog

0 needle hole. Afterwards. fasten screws

1s

at

the center of its swmg.

8835

and

8836.

so that feed dog 0 moves left and right in the

so

that there is no play in horizontal feed

48

so that the distance from throat

fD

securely.)

8.

fasten horizontal feed arm

screw.

CD

and

at the

4D

in

Ill Rotary Hook

Procedures

1 . Remove the throat plate.

2. After aligning the shaft.

3. Adjust when the needle rises

4. Fasten screw 8 and two screws 8 so that a

5. Loosen screw 0 and then fasten with the rotary hook point

• The above adjustment

Base

to

a clearance

Position Adjustment

dot

mark of

of

is

sp1ral

gear 0 and pinion

0.05

mm between the rotary hook pomt and needle 0

2.4

mm from the lowest positiOn. and tighten screws 0 and

0.2

for thread cutter sewing machines. Figures for other models may vary from those give here.

8.

mm space is between the rotary hook base and spiral gear

-18-

temporanly fasten screw 8 to the screw seat of the lower

by

movmg the rotary hook bases (Rand

L)

0.

O.

at

the center of needle

8.

(3)

THREAD TRIMMER

~!l

~

Procedures

1 .

As

shown above. place tension release rocking lever

8 into base bracket 8 and insert through

2.

Install thread trimmer solenoid 8 with screw

3. Place groove and base bracket

4. Install connecting rod G)

5. Install length adjusting connecting rod

6. Attach knife return spring

7.

Adjust

8. When main lever shaft 0 is pressed. adjust with screw

recess of knife driving cam

of

sub lever G) to the slide block of main lever assembly 8 and pass sub lever shaft

0.

Install

with

screw 8 so that there

to

G).

e.

with

lever l

screw

CD

is

with

$.

and lever R

4J)

to lever R

a space of 5 mm between rubber 8 and base bracket

0.

main lever shaft 0 and then install

0.

CD

main bar return spring

with

screw

4D.

CD

and sub lever 0 with screw

tD

so

that the roller

of

8.

main lever assembly

with

screw

8.

and rubber

8.

CD

through sub lever G)

CD.

8.

knife main lever 8 can easily enter the

..

Red

dot

·

Procedures

9. Fit fork lever and screw 0 to the forked part of the plunger.

0 Place pin lever and screw

1 1 1 . Fasten

12. Push main lever shaft 0 and turn lower shaft

13. Align the T mark on the

14.

15.

16. Install tension release connecting rod G with screw 1

7.

18. Install the terminal pin

with

screw

f1'

loosen Install spring peg Install spring G and spring (b.

screw

and slider base

tl

and adjust with moving knife rocking arm e so that there

8 (right and left).

fD

f»

and shaft

so that there

pulley with the dot on the machine head and attach the timing belt

with

screw G.

to

the

12-pin

is

a space

plug.

f)

to fork lever

of

fJ

0.

0.5

mm

until it is difficult

G).

between base bracket 8 and fork lever

T mark

Termmal

Termrnal pm (white)

to

turn.

o/

prn (black)

is

a clearance of

o.5mm

0.5

Thread presser spnng

Shder

12-pin

plug

00

0.

f).

mm between the slider

-19-

ltl

Thr

ead

Trimm

er

Adjustment (Op

ener)

Procedur

1. Turn

2. Set the feed regulat

3.

4

5.

6

es

th

e mach1ne

Wh

en

needle left). (L

oosen

th e

Insta

ll the Temporarily Adju

St

so

that the

case

opener 0 IS

0 nses 2.4 mm fr

pin1

on screw and

throat plate

1nstall bobb1n case

upnght.

or

d1al

to 0.

w1th screw

clearance bet

fully

pulled

~

om

adjus

0

1.0

2.4

1ts

low

t by t

urnmg

0 and

opener 0 wllh

ween

the

rotary

back

1n

the

-1.5

mm

est

pom

screw

arrow

mm

t.

al1gn

th e

9 .

flat

screw

hook

and

d1rect1on

rotary hook

rotary

hook

0 and

bobb1n case

(nqht and

pomt

f)

.)

washer 0 (nght

opene

r 0

left).

w

llh

1s

the

and left)

0 2

mm

center

wllh

of

needle 0

screw 0 when

(r1ght

bobbm

and

Procedur

7. Loosen

8. Turn

9 Remove

10. Turn t

1 1.

1 2

13 . In stall

1 4. Install knife re

es

sc

rew 9 . r

the mac

he

Temporan

Wh

en rotary hook kn1f

e W.

'" If stud sc rews

hme over.

kn1

fe return

machme upngh

ly fasten

bobb

1n

case

pOSitiOn

thr

oa t plate 0 w1th sc

turn

emove

opene

spn

CD

screw 0 . and remove t

spnng 0 (ngh

t

movable

bracket IS 0 .

are unfastened. f1xed

knife w Wi

r 0 IS fully

rew

ng

0 .

05-0 2 mm

0 and screw 9 .

t and left)

th

screw

pulled

back. adj

kn1ves

hro

at plate 0 .

m and

uSt

With screw

4D

will

- 20 -

screw

so

th at t

41)

and

be removed.

=

~

I

4D

he

clearance between the lip

SCrew

4!)

while

pressmg

of

movable knife W and

the

upper

face of

movab

le

[I]

PRESSER MECHANISM

Center

of

presser grooves

Procedures

1.

From the top presser bar

• Make sure the tens1on release shaft 0

2.

Install presser bar lifter gUide 0 and

3.

Install presser 0

• Install so that the center

4. Raise the presser 0 7

5.

Lift presser lifter

6.

Lower presser lifter (!) and attach presser plate spring

7.

Fasten screw

8. Install tension release plate 9 Install knee lift lever

(Attach knee lift lever

!11!

Presser Pressure

AdJUSt

of

the arm. place presser bar guide

0 as shown in the figure above.

collar 8 (-400

to

presser bar 0

of

mm

from the throat plate surface. (Presser foot he1ght d1ffers according to the

0.

make presser bar

G)

so that there

fB

CD

and knee lift lever spring

spr1ng

by turning presser adJustment screw

with

screw

the needles match the center of the grooves in presser

guide 8 contact

is

a space

and tension release

fD

to

of

knee lift lever

is

1 mm between presser bar bracket 8 and the metal bushmg.

0.

presser bar lifter

installed in the arm.

type) to the arm.

0.

presser bar lifter

fB

to

presser bar bracket

connecting

fD

with

stud screw

.:D.)

tD.

0.

and presser bar bracket 8

rod (D with

fli).

0.

and fasten

two

G.

screws

0.

with

4D

and screw

screw

Metal

bushmg

1n

that order on

spec1f1c

CD.

fD_

model.)

II)

~

THREAD

Procedures

1 . Remove needle 0 and presser

2.

Install thread

3.

Install thread

4. Install plunger 0 and soleno1d

• Be sure to insert rubber stopper &.

5.

Attach thread

6. Install presser

7.

Install thread

8. Install solenoid cover

9. Install the terminal pin to the

• Refer to page 3 7 for thread

WIPER

wiper wiper

wiper

f)

and needle

wiper

f).

soleno1d 8 link 0 and solenoid link 8

spring

CD.

w1th

four

flat screws 8 and washers

l1nk

f)

With plunger pin (!).

0.

L

G)

and thread w1per R

4D

with flat screw

12-pm

wiper

plug. adJUStment.

4D

0.

with

flat screw

two

screws

0.

(D.

-21-

8.

II]

REVERSE SWITCH

12-pin

MECHANISM

-0

plug

Terminal pin (white)

Procedures

1 .

Pass

the cord through micro switch cover

2. Install micro switch

3. Install actuator bar 0 with screw

4. Install micro switch cover 0 with screws 0 and washers

5. Install the thread

6. Install the terminal pin

7. Adjust actuator bar play with stop screw

f)

with screws

4:).

wipe~

cord and reverse switch cord with two cord braces 0 and two screws

to

the

12-pin

0.

plug.

0.

and then tighten nut

8.

0.

~.

-22-

[!]

REVERSE MECHANISM

Procedures

1.

Install rear cover 0 with two screws

2.

Set the reverse crank 0 fork on the reverse solenoid plunger

3.

Secure the reverse crank 0 to the solenoid

4. Secure solenoid base 8 with screw

5.

Secure reverse link 0 and reverse crank 0 with screw

6. Secure the cords

7.

Install reverse solenoid cover

8. Install terminal pin to the 12-pin plug.

with

the cord clamp

f)

with

8.

f).

Gi)

and screws

screw$.

base 8 with

Reverse switch cord Thread wiper cord

Reverse solenoid

8.

screw

f).

0.

CD.

12-pm

Termmal pm (black)

plug

Terminal

pin (white)

Ill REVERSE ASSEMBLY

1.

Set the feed regulator dial to the maximum setting.

2.

Loosen screw plunger Pull the reverse handle tighten the

G until

set

fD

1t

screw

ADJUSTMENT

and raise the reverse soleno1d

hits the back of the cylinder.

49

all the way down. and firmly

e.

-23-

[I] COVER

Procedures

1.

Install needle position detector 0 with two screws

2. Install synchronizer cover 0 with two screws G (and washers).

Install top cover 8 with screws 0 and

3.

4. Install face plate 0

5.

Install cover

6. Install slide plate R fl) and slide plate L

7.

Install slide plate F assembly & and stop with screw

with

4D

with two screws

stud screw 0 (and washer) screw

f).

e.

8.

CD.

fD.

(

sTANDARD

OJ

NEEDLE

AND

FEED

ADJ USTMENT (B831, B832, B835, B836, B882))

TIMING

(88

31 )

1. Remove

2.

T11t

the

machme

3.

Align

pos1110n 4 on

Hold the arm shaft

4.

t1mmg belt 0

5. R1ght the

!tl

Needle

and

the

needles.

on

machme

Feed

head. and remove

the

machme

f1rm

. align the

the

pulley

.

head and mstall the needles.

Timing

pulley

(Stand

the

arrow

ard

t1m1ng with

on the

mod

belt 0 .

the red dot.

lower

be

el

8832, 8835,

lt 9 w

ith

the r

8882)

eference

line

on

the arm bed and

mount th

e

1 . Remove the needles.

2. Tilt the

3.

Turn the machme pull

4.

Whil

the arm

5. Return the

machme head back and

ey

e holding the

bed. and attach the

upp

mach

me head to its

er shaft so that

remov

until the ··A·

11mm

g belt 0

ongmal pOSi

e the

t1m1n

mark

1s

aligned w1th

11

won·t move. al

tion.

g belt 0 .

the red dot.

ign the

arrow

and

mstall the need les

on th e

low

er belt pulley 9

with

the referen

ce

line on

Ill Thread Cutter Timing

(8832/

8835

with Thread Cutter)

~essthan

II

H

I~

@Thread Cutter Timing

1.

Remove the needles and tilt the head

2.

With main lever shaft 0 depressed. turn the machine pulley in its normal rotating direction unitl it gets hard to turn.

3. The T mark on the machine (The

permissible deviation of the upper

pulley scale must

back.

be

in line with the red

and

lower shaft timing T mark from the center of the red

dot

on the machine head.

dot

is

2 mm.)

mm

@Upper and Lower

1 . Remove riming belt

2.

Turn the machine pulley until upper and lower shaft timing T mark

With

3.

4. Keep the machine

5.

main lever shaft 0 depressed. turn lower belt wheel

Recheck the upper and lower shaft timing T mark on the machine pulley.

•

Refer to the next page if the lower belt wheel

Shaft

Timing

O.

pulley and lower belt wheel

f)

in the arrow direction until it gets hard to turn.

f)

still. and put timing belt 0 on.

f)

is

improperly adjusted.

is

in lme with the red dot.

-26-

rll

Lower Belt Wheel Position

'

-

(8832,

Reference screw hole

8835,

8837

Red

with. Thread Cutter)

mark

T mark

•

Deviation

±6°

-6"

1. Align the reference screw hole of timing belt wheel lower 0 with theV-groovescrewseatof lower shaft

to lower shaft

(The reference screw hole

2. Push main lever shaft in its normal rotating direction until it gets hard to turn (where the movable knife begins to move).

3. Align the T mark with the red dot.

4. Hold the (Put the belt around the upper wheel first.)

5.

Push main lever shaft

• Check that at this point the

• Allowable deviation:

• If deviation Select one. retighten reference screw

0 with reference screw

is

red.)

8.

0 so the main lever roller enters the cutter drive cam groove. and turn timing belt wheel lower

pulley and timing belt wheel lower

8.

and turn the pulley to a

red

dot is in line

±2.0

mm

is

greater than 2.0 mm. remove the timing belt. Additional positions

8.

f)

in place. and mount the timing belt

point

where

it

is hard to turn.

with

the T mark.

remount the timing belt

as

in steps

0.

are

provided at +6°, +3°. and -6°.

2.

3.

and 4. and recheck.

Thread Cutting Timing

O.

and screw it

f)

rll

Thread cutting timing too early

• Needle thread may pull

• Thread cutter will not function properly.

• Top right thread catcher will not function properly with cotton threads.

out

Ill Thread cutting timing too late

• Needle and thread wiper will strike.

• Improper thread cutting.

-27-

of needle hole.

[TI

ADJUSTMENT

OF NEEDLE BAR

TO

PRESSER BAR GAP (Models

:m-s

cry

II®

1.

Set the feed regulator dial to 0.

2.

The required gap between the needle bar 0 and

f)

is

presser bar

If necessary. adjust

1 ) Loosen screws 0 and

2) Turn the needle bar vibrat1ng crank 0 until the

reqUired gap (dimension needle bar

3) Make sure the needle comes to the center of the

needle hole 0 in the feed dog

0 if necessary.)

dog

Turn the feed

position (so the needle enters the center of the needle

hole).

dimension

as

below.

0 and presser bar

dnvmg shaft 0 to adjuSt the feed dog 0

A.

G.

A)

IS

obtamed between the

f).

0.

(Adjust the feed

II

8831

·8832·8882

8835·8836

B831,

Model

B832,

8835,

8836,

A

13.5 mm

14.2

mm

8882)

Gap

too

D1mens1on

small

A

Ill When dimension A

• The feed dog will strike the needle plate when the feed control dial is set to maximum.

•.

Skipped stitches and needle breakage will occur.

Ill When dimension A

• The feed dog will strike the needle plate when the feed control dial is set to maximum.

• This will cause skipped stiches and needle breakage.

Gap

too

large

-28-

is

too large (feed dog):

is

too small:

0 NEEDLE

• Be sure to check the

1 . Needle to rotary hook point

AND

ROTARY HOOK

pos1t1on

TIMING

detector adJustment (p.43) after the needle and rotary hook

gap

ADJUSTMENT

t1m1ng

1s

adJuSted.

Rotary hook pomt

1. Loosen the

needles and rotary-hook

2. Adjust the engagement and the end face

•

Tighten the screws

• The needle

guard position

2.

Needle bar

screws@.®

of

the

©for

guard

on the rotary hook

when

the rotary hook

rise

and height

and©. t1ps

are about

of

the spiral gear

sp1ral

gear

the

sp1ral

* Needle bar rise spectf1cat1ons vary

reference marks is 2.4 mm.

Needle

Needle guard

0-0.15

and move the rotary-hook base 0 to the

0.05

mm.

f)

by adjusting the clearance between the inner side

f)

to about

gear

is

to prevent needle to rotary hook

is

replaced.

w1th

d1fferent models. Use the followmg table to

0.2

f)

in such a way

mm

by moving the spiral gear

as

mm

not

to

change the contact.

right

or

left until the clearances between the

of

the rotary-hook base 0

f)

to the

nght

or

left.

point

contact. Be sure to readjust the needle

adJUSt

the

r1se.

The gap between

Models-8831 ·

Model

118-831

118-832

118-835

836

118-882

Needle bar nse should be set

•

When

•

machine

8832 · 8835 · 8836 · 8882

Application Thin materials Regular materials

Th1ck materials

Thin materials Regular materials Thick

materials Regular materials Regular

adjusting the walking bar feed regulator dial on model

matenals

pulley scale

Standard

SynthetiC threads 2.6

Synthetic threads 2 6

to

2.4 mm on machmes

with

the red dot.

2.4 2 4

2.4

mm mm

mm

mm mm mm

mm mm

R1se

Thread cutter Standard

----

--

-

2.4

-

2.4

--

with

wh1ch a thread cutter

B831.

Feed dial

Thread cutter

----

-------

mm mm

mm

2 2 3 2 2 3 0

3 3

~

--------.___

--------

0

~

--

1s

used .

press the feed regulator button and align the

-29-

Ill

Needle

bar

down

rise

pos1110n

@

and

Wh

needle

en ra1sed

bar

height

Needle bar

2 4

mm

down

POS

iti

On

e

Needle bar

down

posH10n

(

Mod

el LT2-

B832-400A

8831 . 8832. 8882

( 1)

When

the needle bar e with the bottom line

.. a ..

of

the needle

(2)

When

the needle bar E) IS 2 4

•

aligned needle Loosen the When and

with

center

the rotary h

rot

ary

hook

ll I

[Mod

el LT2-

]

IS

In

ItS

lowest

pOSitOin.

edge

of the needle bar bar with

the bott

thr

om

.

ee set screws 0 . and al1gn the rotary h

ook

pomt1s

po~nt

IS

the

bottom

mm

above liS lowes t

edge

of the need le bar bush1ng 0 .

aligned

1 - 1 .5

mm

with

.

B835-400A

the

bushmg

edge

the

needle center.

• Slide t

needle

he

]

POS

all t

iti

needle

he

On

clamp 1nt0 the needle bar

0 Loosen the set

of the needle bar

POSitiOn.

needle pOSitiOn refer

Atth

1s lime. the rotary

ook

pomt

conf1rm that the

Rotary

way

reference I

screw

0 . and

bushmg

with

the needle

hook

me

0 .

spacer

po1nt

.. a ..

of

the

needle

align

the needle

ence

line

hook po1nt

center

between the top

~

•''

<I

~P.-,---'-

bar

must

pos1110n

.. b ..

Of

the needle bar

mus

t be al1gned w1th the

of

N"d

lo

t- t 5

be aligned

reference

the

needle eye

""'"

mm

IS

8835·8836

(

1)

Wh

en the needle bar E)

the bottom

(2)

Wh

en

the aligned w1th the needle cente r. Loosen t

(3)

When the hook

po~nt

Remove the set po1nt and the

• One full revolut1on

edge

of

needle bar E)

bott

he

thr

ee set

rotary

hook

mus

t be 1 - 1 5

screw

top

of the needl e eye

IS Ill

liS l

owest pOSitiOn. the needle

the

needle bar bush1ng O.

IS

2.4

mm

above liS lowest

om edge

scre

ws

po~n

t

IS

0 . turn t

of set sc

of the

needle bar bush1ng 0

0.

and

align the rotary

aligned

mm.

w1th

he

needle

1S

rew 0 will

the needle

clampset

1 - 1 .5

ra1se

screw

mm

.

or lowe

POS

iti

POSitiOn.

hook

cen

needle

At

th1s

po1nt

ter. t

he

0 .

and

r the needle cla

On

reference line

pOSit

iOn

lime. the rotary

with

the

needle center.

space bet

adJUSt

ween

so that the

mp

.. a ..

Of the needle

reference line

hook

po1nt

the top

space betwe

app rox. 0.6

bar

IS

al1

.. b ..

of the ne

must

be

aligned

of the needle eye

en

the

mm

gned

edle bar

w1th the

and

rotary

with

hoo

IS

k

[I] ROTARY HOOK TO NEEDLE PLATE GAP

0.6-0.9

mm

Ill Standard models

* The rotary hook 0

0 position

to

needle plate 8 gap should be

to

adjust the gap.

Ill Thread cutter models

* The rotary hook 0 to needle plate 8 gap

*

When

replacing the rotary hook. loosen screw

• Somet1mes

(I]

ROTARY HOOK TO BOBBIN CASE OPENER GAP

two

spacers 0 are required. Both should

is

set to 1

0.

and remove the rotary hook

0.6

to

0.9

mm. Loosen screw 0 and adjust the vertical rotary hook

.3

mm

with

a spacer

be

inserted under the rotary hook.

0.

being careful not to lose the spacer

* The rotary hook 0 to bobb1n case opener 8 gap should

be 0.2 mm when the bobbin case opener is pulled all

the way m the direction of the arrow. Loosen screw 0

and move the bobbin

adjust.

r:ase

opener 8 right

or

O.

left to

1.

Needle

2. Needle bar rise. height

Rotary hook to needle plate gap

3.

4. Rotary hook to

•

Be

to

rotary hook point gap . . . . . . . . . . . .

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

bobbm case opener gap

sure

to

readjust rotary hook lubrication after replacing the rotary hook.

•Improper needle stitch1ng. broken

•Improper

.

needle

• Excessive gap: Shuttle body may

•Insufficient

• Excessive gap: Loose stitches.

•I

nsuff1c1ent gap: Damage to shuttle body

adjustment may result in improper

needles.

adjustment may result in improper

stitching. skipped stitches. thread breakage.

gap: Improper stitch tightness

right

and left

skipped stitches. thread breakage.

right

and left

not

be

properly

positioned near the needle plate.

ing

improper

..

-----·---~·-·

st1tch tighten-

_____

___,

[I]

PRESSER FOOT

HEIGHT

ADJUSTMENT

1. Loosen (Remove the face plate on model 8835

Refer

2. The presser foot 9 bott om should be 7 mm from the needle plate top. Loosen screw 0 . and vertiCally adjust the presser

bar

(F1rmly re

•

• Use a presser foot

sc

rew 0 . open the face plate 0 . and

to

the table

below

for the requ1red presser foot he

0 to adjust the he1ght.

tigh

ten

screw

0 after adjustment

Be

careful

with

Refer

not

to

turn

presser bar 0

w1th

no

front

thm and standard matenals

to

page 6 7 for presser foot types.

Subclassif

~

Presser

• The presser bar lifter lever should be adjusted to 5

foot

Presser

Knee l1fter

bar

height .............

lifter

gap

to prevent

icati

on

Model

lever

ra1se

the presser bar

·8836

.)

1ght.

IS

completed

Sti

8831 I 88321 8835

tch

sk1pp1ng

7

mm

10

)

mm

l1

fter lever O.

or

thread cast-off at the start of sew1ng

Standard

8836 I 8882

8

mm

12

.7

mm

for thm matenals.

when

Thread

B83

2-400A I B835-400A

7

10

Cutte

mm

work1ng

r

900

A

-

32-

[II

FEED DOG HEIGHT

ADJUSTMENT

•

0

1.

Turn the pulley and set the feed dog 0 to the up position.

2.

The feed dog 0 should be 1.0 mm above the needle plate. Loosen screw 8 and vertically adjust the feed bar 0 to adjust the height.

11

The back

Frrmly tighen screw 8 after adjusting the height.

llllf

the feed dog

lll

If

the feed dog

7

of

the feed dog needle hole should be smooth to enable free thread passage.

is

too high: . . . •

is

too low: . . . . • Stitches will be shorter than indicated by the feed regulator dial.

The

feed dog will strrke the needle plate.

• Stitches will be longer than indicated by the feed regulator dial.

-33-

[!]

TENSION RELEASE ADJUSTMENT

Tens

ion

discs are closed

0

Approx. 0.5 mm

Greater than 0.8 mm

1 • When the presser

1) Check the presser

2) Check that the thread tension disc 8 is open

0.

lever

3) Turn the tension release lever 0 to adjust the tension disc gap

2. During thread cutting

1) The tension release crank 0 to presser bar lifter 8 gap should be 1.5 mm when the tension release is not operating.

2) Loosen nut

Ill

Insufficient

• The thread will

Ill

Excessive

• Improper stitch tightening

• Loose stitches will appear

foot

0.

remove screw

tenison

be

tension

is raised

height. Refer to page

held too tightly and will not pass smoothly

disc

with

the presser bar

f).

and adjust

gap

at

the corners

lifter

lever

32.

0.8

mm when the presser

with

the link

with

thread cutter sewing machines.

0.

8.

through

foot

is raised 7

the disc.

mm

with the presser bar lifter

-34-

[I]

STITCH LENGTH

f)__,_

__

-

@)=::r-------~~-~

1 . Forward feed adjustment

(1) Set the feed regulator dial 0 to the maximum position.

(2)

Sew.

(3) Measure the stitch length.

ADJUSTMENT

_

~.

To increase stitch length

( 1 ) Loosen screw (2) Tighten screw

To decrease stitch length

(

1)

Turn the feed regulator dial 0 all the way counterclockwise.

(2) Loosen screw (3) Tighten screw

2.

Reverse feed sewing

*Reverse

3.

Aligning forward/reverse feed stitch lengths

( 1 ) Adjust the forward feed stitch length. (2) Sew. Stop the machine with the needle below the top of the needle plate. (3) (4) Adjust the reverse feed stitch length by adjusting the position

feed stitch length

Drop

the reverse lever 8 (reverse feed switch) all the way down to sew in reverse.

stitch length

• Readjust the stopper 0 position when the forward feed stitch length

8.

and turn the feed regulator dial 0 counterclockwise.

8.

and turn the feed regulator dial 0 clockwise.

8.

and turn the feed regulator dial 0 clockwise.

8.

is

determined by the forward feed stitch length.

will decrease

as

the stopper 0 is raised.

of

the stopper 0 on the reverse lever

is

changed.

0.

Reverse feed

-35-

[@]

REVERSE FEED SOLENOID

ADJUSTMENT

1 . Loosen screw

2. Turn the feed regulator dial Raise

3.

4. Completely lower the reverse lever

5. Tighten screw

the reverse feed solenoid plunger

O.

0.

to

the maximum stitch length setting.

r

il

An

excessive gap between the soleno1d base and reverse feed solenoid

strength of the magnet and may prevent reverse sewing.

Ill Reverse switch adjustment

r--~----·

~

I I

G.

f)

until it meets the back of the solenoid

1 . Loosen screw

it is easy to reach. Firmly tighten the screw

2.

3. Loosen nut 8 and turn screw 8 to

pushbutton pressed.

so

0.

plunger

0.

and posrtion the pushbutton

will decrease the

O.

that the switch

is

f)

where

adJuSt

activated when

the

0

-36-

[ill THREAD WIPER ADJUSTMENT

--

-..-

About 0.3 mm

1.

Set the switch to the needle up stop pos1tion and the feed adjustment Set the needle to the needle up stop position.

2.

3.

Loosen the

from the needle point when it

•

Make sure that thread wiper link B

4.

Pass

5.

Loosen the screws threads

four

screws

f).

and raise

is

pressed

or

8 will not contact the presser bar .

the threads through the needles.

0 and move the thread wiper 0 to the right

with

its hooked end.

lower the solenoid 0 until the tip

with

your finger

as

d1al

to pos1tion 2.

of

the thread wiper 0 projects about 0.3 mm

shown.

or

left so that the thread wiper

Owill

positively hook the

\

6. Loosen the screws presser set screw

• If the clearance the thread Also check that the needle set screws

wiper 0 as

f).

and raise

0 is about 1 mm when the thread wiper 0 returns to its ongmal position.

is

too little. the thread

close to the needles

Solenotd plunger

or

lower the stopper 0 until the clearance between the tip

wiper

0 may

not

be able to hook the threads depending on the kind

as

possible. provided that the threads will positively pass

will

not contact the thread wiper

0.

1

of

thread

More

Less

wiper

of

through

0 and the

thread. Set

the work.

-37-

7.

The path

needle tip

The

Ill Step 3

If the

If the gap is

Ill Step 6

If the 1 mm gap is

Ill Step 7. above

If the

If the gap is

of

the thread wiper 0 tip is shown in the figure above.

to

thread

0.3

mm gap is

0.5

to

wiper 0 tip

too

small. thread wiping will not

too

great. the thread wiper 0 will strike the presser foot.

1 mm gap

too

is

small. the thread wiper 0 will strike the needle tip.

gap should be

great. the thread wiper 0 will strike the presser foot.

too

great. thread

0.5

to 1 .0 mm. Loosen screw 0

be

properly performed.

wiping

will not

be

properly performed.

to

adjust.

-38-

(g)

SLIDER

1. Slider

Bobbin thread clamp spring

ADJUSTMENT

l

Lever

Connecting rod

1)

Remove the bobbin thread clamp spring.

2) The slider 0 to slider base 8 gap should

8.

the movable knife rocker arm

3) Loosen set screw

2.

Bobbin

thread clamp

0.

and adjust the

spring

(The slider 0 should not strike the slider base 8.)

forward/back

8

Movable knife return spring

be

0.3 to

0.5

mm when the movable knife 8 is worked back and forth with

position

•

• The bobbin thread clamp spring 0 should be installed

0.3-0.5

Bobbin thread

of

the movable knife rocker arm

If

the thread end is not clamped lightly on horizontal rotary hook machines. stitch formation at the beginning of sewing spring 0 end.

directly below and slightly to the side knife. Note:

is

not possible. The bobbin thread clamp

is

provided on this machine to hold the thread

Be

careful th clamping area

clamp spring 0 does or

feed dog.

clamp

not

8.

of

the bobbin thread

touch the rotary hook

mm

of

the movable

Ill Insufficient bobbin thread clamp spring tension

• Stitches will

be

skipped at the beginning of sewing when a heavy thread is replaced with a light thread.

Ill Excessive bobbin thread clamp spring tension

• Several stitches will be skipped at the beginning

of

sewing.

-39-

..

. j

I

[ill MOVABLE

AND

FIXED KNIFE

ADJUSTMENT

! I

( 1) Remove the needles and raise t

(2) Remove the screws (3)

Loose n the screw

Tilt th e head back.

(4) (5)

Remove t (6) Operate the osc1llat1ng (7) Remove t

(8)

Remove the screws 0 and remove the f1xed

he

kmfe ret

he

screws 0 . and remove the movable

0 a

nd

remo

f)

. remove screw 0 and remove the n

urn

spn

ng

arm 0 until

he

pres

ser foot.

ve the cover 0 .

ee

dle plate.

0 . an d retu rn the head to Its ong1nal POSitiOn.

the screws 0 are

kn1fe

v1S1bl

kn1fe ().

~

.

e (

with movab

le kn1fe

on

nght

)

I

·'

:•

-40

-

(1)

Turn the machine pulley by hand until the bobbin case openers are pulled all the way in the arrow direction.

(2) Temporarily fasten the movable knife

your finger from above.

(Securely tighten the screws 8 after the clearance between the tip

0 with the screws

0.05 - 0.2 mm.)

(3) Fasten the fixed knife

(4) Fasten the needle plate (5) Fasten the cover 8 with the screws

(6) Tilt the head back and install the knife return spring (7) Return the head to its origmal (8) Install the needles m the needle clamp and lower the presser foot.

CD

to the needle plate with the screws

With

the screws e and

G.

8.

pos1t1on.

8.

and operate the movable knife 0 while pressing it with

of

the movable knife and the holder bracket is set to

0.

(Note the fixed knife has right and

0.

wrong

sides.)

011

-·~.

whetstone

Be

sure the edge

clean and sharp.

uttmg part

C

A ragged edge may result in thread breakage

@ If the

•s

kn1ves

become blunt. sharpen the fixed

as

shown.

kn1fe

The movable ordinary whetstone. If it becomes blunt. replace it with a

0 cannot be sharpened with

new

one.

kn1ves

«!)

an

(II

Movable

\.

knife 0 to rotary hook contact

or

excessive knife to hook gap may result in improper thread cutting.

-41-

[ill KNIFE

MAIN

LEVER ROLLER

1.

Install

2.

Check

3.

Press the

drivtng arm

•

Tighten

0

the

knife

that

the

ma~n

the

return

knife

ma1n

lever shaft 0 .

recess . nut

on

the

spnng

lever

stopper

Damper

.

shaft

turn

the pulley. and

screw

0 to

0 so t

Auxtltary

screws

support

hat

turn

the

lever

f)

gap

stopper

screw

is 5 mm.

screw 0 so

w1ll

not loosen

Pm lever woth scr

/

e K

(Loosen

the

after

Kntfe

drtvmg

ntfe return

Otagram

screw 0 to

main

lever

the

adJuStment

ew

pan

tng part

(A)

of

adJUSt.)

roller

easily enters the

1s

kntfe

drtvtng

completed

cam

.

kn1

fe

[j]] KNIFE

* Knife

1.

When Loo

sen

2. Be sure t

DRIVING

dr

iving lever

0

the

ma1n

screw

her

e is

LEVER

lever

shaft

0 to

adJ

no

play parallel to the shaft

ADJUSTMENT

0 tS at res

USt the knife dnv•ng leve r

0.5

mm

t.

the

kn1fe

dnv

1n the

ing lever

f)

to

movab

.

lever 0 and knife dn

le

knife

base

bracket 0 gap

ving

lever

should

be

0.5 mm.

f)

.

-42

-

[!!]

POSITION DETECTOR ADJUSTMENT

Needle

down

stop

pos1t10n

1 . Thread cutter element

Set the thread cutter element 0

2.

Needle down stop position

Set the needle down stop element 8 to 2.5 on the position detector scale.

3.

Needle

Adjust the needle up stop element 0 so the red dot on the arm and the pulley mdex are aligned when the treadle pressed to reverse.

[Adjustment]

Loosen screw

respectively.

up

stop position

(The

needle up stop element should

0.

and move the thread cutter element

to

0.5

on the position detector scale.

0.

needle

be

at approximately 8 on the positron detector scale.)

down

stop element

Needle

8.

up

slop

and needle up stop element

R~ex

pos01oon

--T 1 !""I

is

0.

[!ZJ

CORNER SEWING POSITION ADJUSTMENT

1 . Needle feed rocker

crank

adjustment

(8835·8836)

* Turn the center screw 0 in the fork

so the needle feed rocker crank 0 fits in the fork.

Tighten nut

•

the crank secure in the fork.

0 after the adjustment

of

the slide arm 8

is

completed to hold

Stiff needle feed rocker crank 0 operation will make the needle bar strff. too.

-43-

2.

Push

lever position adjustment

0

Snap

rmg

* Push the shaft 8 m the d1rect1on

honzontal play. and Be

sure the push lever 0 still operates smoothly.

t1ghten

screw

of

the

arrow

to

prevent

8 to the screw stop.

Excess1ve

•

together or

3.

Slide shaft adjustment

* Set

stop

slide shaft 0

honzontal play

e1ther

lever • to R on POSition

is

* Lever shaft arm e

slide shaft

0

IS

mdependently. It

0

even

with

the end

will

not

function

not

properly aligned

will

affect the

guide

of

properly. and lever shaft

stop

will

be hard

•.

Loosen

slide shaft

with

the end

lever

to

drive both

screw

support

of

pos1t1on.

Shde shaft

e and

8.

arm

slide shaft

and

will

result m

or

e1ther needle(s) if the

support

move

spring

support

bracket

lever shaft

and set collar adjUStment

8.

poor

operat1on

dr1ve

arm e right

of

both

needles

torque

is

too

great.

or

left so that the end

will

be diffiCUlt. if the.

of

4.

Slide shaft support bracket adjustment

0

* Set the stop lever to the

f).

frame Insert gUJdescrew 0

dot

through

on

the posrtron

the oval hole

o.

Tighten stop Improper

*

needle bar assembly

5.

Stop lever arm spring pressure adjustment

screw

0.

adJUStment may damage the slrde block tab and release prn end. resultrng

gUJde.

rn

shde shaft

Align

the left end

support

S prrng pressure collar posrtron at stop lever posrtron A

of

sir

bracket

de block 0 wrth the left srde

0.

and screw the set

rn

control

screwtrghtly

damage to the release prn and

of

the needle bar

rnto collar

*

Spring

pressure is properly adjusted

the L and R positions.

*

Screw

the

4D

is set

Spring pressure should be equal at both

•

If the stop lever 0

•

collar 0 tight

to

the L or R position.

at the

will

not

rf

the

point

where

stop at the dot.

stop

lever 0 stops at the center

the

stop

lever

arm

spring 0 lightly

positions

readjust

L and

the stop lever arm

R.

Sprrng pressure collar

position at stop

lever posrtion L

dot

when

the push lever 8 is released from

touches the col:ar 8

spring

pressure .

control

when

the

stop

lever

6.

Needle bar stop adjustment

* Set the needle bar 0

*

The

gap between the needle bar top and needle bar stop 0 bottom should be approx.

0

to

adjust.

*

Presser

foot height

to

the up position.

(8835-900)

0.5

mm. Turn the needle bar stop

1.

The presser foot 8 should

2.

Loosen screw 8 and vertically adjust the cylinder bracket 0 to adjust. (Firmly retighten the scew

be

raised 7 mm above the needle plate by the presser bar lifter cylinder

8 after the adjustment is completed.)

-46-

0.

[!!]

TIMING

BELT REPLACEMENT

Ill Removing the timing belt

(1) (2) (3)

Remove Remove Remove

two

screws 8 and the machine pulley.

timing

belt 8

timing

belt 8

r~

from

the

as

shown above.

I

timing

belt wheel

lower

8.

Ill

F1tt1ng

the

t1m1ng

belt on

( 1) Install

(2)

(3) Refer to page 50. 0 needle and feed

•

t1m1ng

belt 0

Fit the machine pulley onto the uppar shaft. and fasten

operating

Mount

direct1on

the sew1ng mach1ne pulley so there

1n

the arm open1ng. and place belt 0 around the

of

the machme.

w1th

the arm·s screw

t1m1ng

It

s~at.)

adjustment.

1s

no hor1zontal play

with

screws

e.

1n

the arm shaft.

t1m1ng

belt wheel upper.

(Align the front screw.

as

VIewed

In

the

-47-

"'

U1SASSEMHLY

*

The

disassembly procedure descr1bed

procedure

OJ

COVER

for

model

LS

PHUCEUUH.ES

2-883

2 for d1sassembly

)

below

IS based on the standard version

of

the lower shaft and th read

[8837·8838

of

cutter

]

model

LS2-8837

assembly.

. Refer to the

Model LT2-B838

l

l'

j

Loosen

1.

2.

Remove the seven set screws 0 . on Remove bed slides L 0 and R 0 . (On

3.

Loosen set

4.

Remove

5.

Remove set

6.

(Removal Loosen set

7.

Loosen set

8.

Replace

•

the

thumb

top

screw 0 . remove step screw

cover

0

.)

screw

CD

. and the needle

screw

4D

and needle plate

screw

G)

and

the

will

be easier if the vibrat1ng presser f

screw

4»

. and remove the l1ftmg presser f

screw

G)

and remove the needle guard

w1th

parts for a

two

f)

and washer 0 . and remove the face plate 0 .

top

cover

0 and

top

cover gasket

8838.

remove the set scr

4!)

.

4I)

.

vibr

ating presser foot

needle mach1ne on model

~

oot ~ 1s

oot

suppo

-

first

4D

rt W.

8838

ew

ra1sed

(leave

f)

. (Remove with the thread take-up cover

and remove bed slide F

w1th

the presser foot

the

thread

cutter

and thread cutter gu1de plate on .)

l1fte

fiD

r leve

.)

r)

1n

place

- 48 -

III

TENSION RELEASE

1 .

Remove set screw

2.

Loosen set screw

3.

Remove set screw

Refer

to

the above diagram

LEVER

0.

and remove the triple

0.

and

remove the thread take-up spring regulator 0 and tension release lever rod

8.

and remove the thread take-up spring stopper

for

tension release lever disassembly.

eye

thread guide

0.

8.

~

[!]

PRESSER FOOT

AND

WALKING

BAR

[1] PRESSER FOOT 0

1.

Loosen screw 0 and remove the knee lifter roller bracket

2.

Remove cotter pin

3. Remove stud screw

4. Remove stud screw

5.

Loosen the pressure regulating

6.

Remove presser bar lifter guide

• Disassemble the presser foot assembly after disassembling the walking bar assembly.

0.

and remove knee lifter complying bar

8.

and remove the knee lifter connecting rod

8.

and remove knee lifter lever spring 0 and knee lifter lever

thumb

screw (!). remove screw

Cl).

0.

G.

8.

G).

and remove the presser bar flat spring

8.

-49-

r~

1

!

I

!

I

.,

[2]

WALKING

BAR

ASSEMBLY

!

i

I

:)

A

Remove the

1.

(Remove the face plate thumb screw if one is present)

Remove the two screws

2.

Turn the nut on the bell crank roller 0 with a wrench and remove the roller

3.

Remove the bell crank

4.

Remove the bell crank link

5.

Remove the wick and remove the walking bar presser foot link

6.

7.

Remove the lifting presser foot adjustment walking presser bar Loosen screw

8.

Remove wing

9.

Loosen screw

10.

[1] PRESSER FOOT 8

two

screws

0.

and remove the feed lifting rocker shaft

8.

and remove the washer 8 and the lifting presser

8.

0.

CD.

41.

nut

8.

lock washer

Cl).

and walking bar eccentric crank

CD.

screw(!).

spring washer

0.

walking presser bar presser

48.

and hinge screw

fD.

t

8.

Gl).

foot

guide

0.

walking presser spring fl. and

I

__

~.---

1 . Remove the cap

2.

Loosen the screw 8 of the presser bar guide bracket presser bar guide

3. Remove the presser bar guide

4. Remove the tension release lever 0 and thread tension release

0.

8.

and then remove the presser bar

8.

presser bar lifter

8.

the screw

0.

G.

and presser bar guide clamp

J

8ofthe

slide(!)

presser bar lifter

together

with

G.

and

thescrewf)ofthe

8.

the presser bar guide bracket

8.

[D NEEDLE BAR

AND

NEEDLE

THREAD

TAKE-UP

41)

fi)

@

0

\

~

1. Remove the

2. Remove 3 Loosen

4. Remove the needle bar frame assembly 0 .

(The needle bar 0 . needle bar clamp

5. Loosen sc (The w

6. Remove the thread take-up

7 Remove the thr ead take-up slide

(I]

FEED

two

screws 0 . and remove the needle bar frame stop

screw

0 . and rem ove

screw

0 . and remove t

rew

CF)

and remove the

1ck

will

come out

ASSEMBLY

th

e felt 0 and felt bracket 0 .

he

needle bar frame

thr

w1th

the thread take-up

4I)

.

~

-

~

-

and needle bar frame slide

ead take-up

and remove the needle bar crank r

(3

e

{;}@)

@(3

fii)

p1n

dnvmg

6)

.

6)

.)

shaft

f)

.

block

.

4D

will come out.)

od

~

-

Remove the

1.

Remove st

2.

3. Tilt the mach1ne. Loosen the three screws

4 .

• The p Loosen

5.

Loosen the feed driving arm

6.

feed driving shaft Loosen the feed driving

7.

eed dr

f

• The t

(Removal

• On

two

screws 0 . and remove the feed

op

screw 0 and the washer. and remove the

f)

1n

the

p1n10n

1n1

on

gear 0 and opener lmk 0

screw

~

-

and remove the fe ed bar

CD

screw

6)

. needle bar vibrating crank

m.

arm

CD

scr

ew

6)

. needle bar vibratmg crank

iving shaft m.

wo

set

col

lars

~

will

come off.

will

be

simp

lified if the feed driving

model 8838.

move the rotary hook base to remove the feed driving shaft

dog

f)

.

bobbm

gear 0 . and remove the rotary hook 0 .

will

also

come

liftmg

fork

41)

case

out.

.

G)

arm

CF)

and need le bar vibrating crank

opener

screw~-

0 .

and set

40

collar

G)

are opened

.

~

screw

4»

. Remove the

4»

. Remove the

with

a wedge.)

OJ

FEED ASSEMBLY

Q)---i

•

~~~:;;]

0

--==-tlti9l~r-

1.

Slide the collars 8 onto the feed driving shaft

0.

vibrating crank

Install the opener link

2.

• Align the spiral gear and pinion gear.

• Tighten the pinion gear screw against the screw stop of the rotary hook shaft.

Set the feed bar lifting fork 0 on the feed driving shaft

3.

4. Secure the feed dog

5.

Secure the needle plate

6. Tighten the set screw

Lightly tighten the set screws.

0.

rotary hook complete 0 and pinion gear 8 on the rotary hook base.

di)

with screw

48

with screw

I)

of

the collars 8 so the feed dog 0

CD.

G).

0.

and then slide them over the feed driving arm 8 and needle bar

0.

and lightly tighten the screw

is

centered in the needle plate

I

0.

48

hole.

m NEEDLE BAR

1.

Tilt the machine.

2.

Assemble the needle bar crank rod

3.

Pass

the thread take-up pin 0 and wick 0 through the thread take-up lever

with

0 so there

screw

0.

of

Tighten screw

• Hold the screw stop

4. Insert the needle bar frame driving shaft 0 in the needle bar frame assembly

5.

Secure

• The screw stop

• Slide the needle bar clamp shown in the block

6.

Secure the needle bar frame stop

7.

Secure the thread take-up felt

8. Add oil to the wick

• Make sure the needle bar frame 8

is

of

the thread take-up pin 0 up while passing the wick through the take-up lever.

the needle bar frame driving shaft 0 should be facing

G).

41.

0.

thread take-up slide

no play in the thread take-up lever

G)

on the needle bar crank rod

48

with

screw

G).

G)

with

washer

is

4'1

and screw

not loose and that the machine works easily after assembly

8.

0.

G).

-52-

and thread take-up lever

8.

fit the needle bar frame assembly

8.

and insert this assembly in the arm.

8.

up.

8.

and install

is

completed.

as

OJ

WALKING BAR

[1] WALKING

e

-----,.:~____,~·

~--.<5--~--lllf

[2] PRESSER FOOT 0

BAR

AND

0

PRESSER FOOT

/

1.

Slide the walking presser bar 0 into the needle bar frame.

2.

Mount

the walking presser bar spring

e.

presser bar presser foot adjustment screw

• Turn the lifting presser until the screw is flush with the arm top.

and tighten the lifting presser

e.

foot

f)

and upper feed

adjustment screw e in

------;

r

~

;::T·:.~

..

--

~ri5t~--

0

I

l

!

1.

Slide the presser bar 0 into the arm. and assemble the presser bar guide presser bar guide bracket

2. Secure the vibrating presser foot 0 to the presser bar lifter 0 with screw

3. Tighten screw 0 so the distance from the bottom

0 is 1 mm.

guide

4. Adjust the vibrating presser foot presser bar guide bracket

5.

Lift tne vibrating presser foot 0 10.5 mm bar lifter lever

CD.

and tighten screw

,f))\

\:Mi

0

I

~

.

·.

:

\~rfr:

: \clJ.UI J

,

I

• • e

I I I ..,

.....

J

L..--

.:e I

i :

e

9

I

rv··

\:--G

e.

of

the presser guide bushing 8 to the bottom

0 so the distance from the

top

e is 1 mm when the vibrating presser

with

the presser bar lifter

CD.

~

-.

10.5

mm

f).

presser bar lifter 8 spring fl. plate

0.

of

the presser bar

of

the presser bar bushing 0 to the

foot

is down.

CD.

press the presser bar lifter e against the presser

bottom

8.

of

and

the

-53-

[1] WALKING BAR 8

Feed

dog

1.

Fit the walking bar rocker shaft 0 into the arm.

2. Fit the walking bar eccentric crank Mount

3.

4. Fit the walking bar link 0 on the bell crank (Fit the walking bar presser foot link 0 and bell crank 0 to three points: the bell crank link bar. and presser bar lifter.)

5. Secure the

6. Secure the feed lifting rocker shaft

7.

Secure the lifting presser foot guide • with screw

8.

Fit

9. Replace the hinge screw

• Screw the wing nut

0. Secure the lifting presser foot

1

the bell crank

bell crank roller

the wick on the walking bar support link

f1)

on the walking bar shaft

&.

4D

tight

0 onto the walking bar shaft

0.

4!i)

firmly

to

the bell crank

4D

with screw

0.

48.

0.

walking bar eccentric crank

at

the center

G)

with

screw

of

the walking bar eccentric crank 0 groove.

CD.

0.

and tighten the set screw

washer

fD.

lock washer

f)

so the crank

f1)

hole. walking bar presser

48.

and

wing

nut

G).

is

firm.

111

Lifting and Vibrating Presser Foot Vertical Timing Adjustment

1 . Loosen wing nut

2. Loosen bolt

3. Set the outer presser foot

4. Turn the machine pulley so that the thread take-up crank outer presser foot

• Make sure there

• Adjust the lifting and vibrating presser feet to the same height. ( 1) Lower the lifting and vibrating presser feet (2) Move the needle bar crank

G).

and retighten at the center of the walking bar eccentnc crank

f).

fB

and inner presser foot

f)

and inner presser foot

is

no play in the walking bar shaft

fB

on the thread take-up crank

G)

to the needle plate

f1

is

horizontal.

G)

are tight to the needle plate

0.

to

the needle plate.

f1)

to the right. and firmly tighten the set

-54-

0.

tJ.

as

shown in the figure above. Make sure the

tJ.

and then tighten bolt

f).

screw&.

Ill N eedle Bar

Fram

e and Feed

Dog Posi

tion

Adjustment

B837

8838

0

1 Set the feed regulator

2 T1ghten the feed dog. needle plate. v1bratm g presser foot. and lifter presser foot 3 Secure the

4.

AdJUSt

AdJuSt the adJustment

5

AdJuSt

needle 0

the needle bar v1brat1on crank 0 so the

the feed dn

the feed bar

d1al

to 0

w1th

screw

0

v1ng

arm 0 so the needle 0 enters t

1s

com

pleted.

«!>

so the feed

dog

gap

extends 1

between the presser bar 0 and

he m1dd

mm

le of the feed

beyond th e needle plate top. and then

dog.

walkmg

F1rmly

presser

t1gh

ten screws 8

t1gh

bar 0 IS

and Owhen

ten

screw

8.2 mm.

4D

-

55-

Ill Needle

to

Rotary Hook Timing

Rotary hook pomt

0.05-Q.1

Needle

mm

IL~~Needle

TI1.5mm

J----r

2 .4

mm

1.

Remove the needle plate and feed dog. and set the feed dial

2.

The needle position

3. Adjust the needle guard so the needle lightly contacts the needle guard after adjusting the gap. Firmly tighten set screws

•

to

rotary hook point gap should

of

the rotary hook base 0

0.

f).

be

0.05

to

0.1

to

adjust the gap.

0 after the adjustment is completed .

Needle Bar Lift Stroke

* The rotary hook

position. Loosen the lower shaft gear 8 set screw 0 and shift the lower shaft gear 8 horizontally to adjust.

The screw stop on the rotary hook shaft prevents alignment using the

•

Tighten the set screw 0

•

point

should

be

aligned

of

the lower shaft gear 8

with

the needle center when the needle is raised

without

to

0.

mm. Loosen set screws

pinion

changing the screw stop used .

0.

gear.

f).

0.

and adjust the horizontal

2.4

mm

from

the

down

Needle Bar Height

* The needle hole edge to rotary hook

center. Loosen screw Firmly retighten screw 0 after the adjustment is completed .

•

The rotary hook bushing determines the

•

gap is a fixed distance (1.2 mm).

0 and adjust the vertical needle bar position

point

gap should

he1ght

of

the rotary hook complete. The rotary hook complete to needle plate

Ill Bobbin Case Opener Adjustment

be

1.5 mm when the rotary hook point

to

adjust.

is

aligned

with

the needle

1 . Install the feed dog and needle plate.

2. Firmly tighten the bobbin case

3. The rotary hook 0 to bobbin case opener 0 gap should be

in the direction the gap.

• Be sure to firmly retighten

of

the arrow. Loosen screw

opener

screw

0 in place with set screw

0.2

mm

f)

and adjust the horizontal position

f)

when the adjustment is completed.

-56-

f).

when

the

bobbin

case opener 0

of

the bobbin case opener 0

is

pulled all the way

to

adjust

[2] PRESSER FOOT 8

1 . Tighten the presser foot adjustment screw 8 with the end of the presser plate spring 0 connected to the presser bar

guide bracket

2. Install the knee lifter lifting lever G and spring 8 with the screw

Hook the end

Install knee lifter lifting guide

3.

4. Secure the knee lifter connecting rod 0 with step screw

5.

Slide the knee lifter complying bar e

6. Secure the knee lifter roller bracket 8 to the knee lifter complying bar

8.

of

the knee lifter lifting lever spring 0

8.

onto

the knee lifter connecting rod

on

the spring peg.

0.

e.

«!)with

and secure it

set screw

with

48.

the cotter

CD.

I

Presser Foot Pressure Adjustment

* Adjust the presser foot pressure

[I] TENSION RELEASE

LEVER

with

presser foot adjustment screw

G).

1 . Tighten set screw 8 so both ends of the thread take-up spring stopper 0 are level.

2. Fit the tension release lever rod 8 in place.

3. Secure the

4. Secure the triple eye thread guide 0

• Assemble the upper tension control assembly G

upper

tension control assembly G

with

the set screw

with

set screw

0.

8.

as

shown in the figure above.

-57-

I}]

COVER

1 . Secure the

2. Secure the face plate 8 with step screw

3. Install bed slides L 0 and R (Install bed slide F 0 on model

top

cover gasket 0 and top cover

0.

8838.)

0.

f)

with

washer

set screw

0.

and

8.

thumb

screw

f).

-58-

[0

NEEDLE

AND

FEED

TIMING

ADJUSTMENT

(standard)

R

ed

do1

Remove the

1.

Tilt the

2

Turn

3.

4.

Wnh and

1nstall t1mmg bel t 0 .

5. Pull

the machme

Ill Thread

needle

machme

the mach1ne

the

upper

shah

cutter

timing

0

head

back

and remove

pulley

until

held sllll. align the

head back to

adjustment

t1m1ng

bell

0

pos1110n A 1S m line

arrow

1tS

or1gmal pos1t1on. and 1nstall

on

the t1mmg

w1th the red

dol.

belt

wheel lower 0 w1th

the

needle

T mark

the reference line

on

the arm bed.

Ill Thread

1. Remove

2. 3 The

@Upper and

1 Rem ove

2 3 Press

cutter

the

needle

Press the kn1fe

llrnmg

mark

from

the

center

lower

th

e t1mmg

Turn

the

pulley

the

kn1fe

timing

ma1n

shaft timing adjustment

and al1gn the t1mmg mark T

ma1n

Ton

of

and

lever

the

belt

lever

confirmation

lilt the mach1ne

shah

0 and

pulley

should

dot

0 .

shah

0 and

turn

be

turn

the

aligned

with

the

lower

pulley

1n the

w1th the red

the red

belt

dot

wheel

normal d1rect1

dot

on

pulley

turn

4

Hol

d the

ma1n

pulley

5. Recheck ,..

Refer to l

the

owe

ma1n

r belt

and the

pul

ley

pulley

lower

ummg

mark T alignment.

adJuStment

belt

wheel

on

page 2 7 1f the l

pulley 0 so

ower belt pulley

they

w111 not

- 59 -

the

0n unt1l

mach

ll

me head

0 m the d1rect1on

mo

ve. and

IS not

then

properly

1S

hard

Allowabl

of the

mount

pos

to

turn e dev1allon

arrow

the

iti

oned

.

IS 2 mm

until

I!

IS

ummg belt

hard

to

0

[I) FEED

DOG

ADJUSTMENT

IN

BACK

AND

FORTH

0

DIRECTIONS

15

mm

1. Turn the feed

2. Loosen screws 0 and

• After the adjustment. securely

3. Turn the mach1ne pulley

• Check

4.

Slowly presser bar to

• If the needle does ( 1) Remove the rear cover. and loosen (2)

Move

dog

f)

(3)

After the adjustment.

8.2

ad1ust1ng

the needle to be sure that

turn the machme pulley. and see If the needle falls exact ly m the

walkmg

needle bar

.

d1al

to

pos1t1on

f)

. and

adjust

lighten

until

the needle bar

1t

bar presser bar

not

fall exactly m the center

suppo

rt 0 little

tighten

by

screw

mm

!~\

0.

feed

dog

screws 0 and

IS

not

bent. Or. replace

gap

1s

8.2 mm.)

screw

0 .

litt

le

unt

il the

0 securely.

f)

so that the

f)

up

m Its h1ghest poSitiOn

of

the needle hole m feed

tip

of

center

.

1t

with a new

the needle IS 1n l

!tl

,.

"

..

,,

"

• The feed

• Sk1pped stitches. broken needles.

• I

of

1ts

needle hole will

needle

center of the needle hole

dog

f)

. adjuSt

1ne

with the center of the needle hole

be

as

11

1n

the follow1ng

shown

1n

feed

Excessive presser bar and presser bar

the feed regulator

mprop

cutter

gap

dog

will

er thread tn

1s

used

stnke the needle plate

d1al

IS

set to

max

mmmg

when the

above.

dog

f)

manner

1n

walking

when

1mum.

thread

. (The

feed

Stnkes needle plate gap

IS

lllSUffi

Cie

nl

Strikes needle pla te ''

''

gap

1s

excess1ve.

-

60-

[I]

NEEDLE

1.

Clearance between needle and rotary hook point

AND

ROTARY HOOK

TIMING

ADJUSTMENT

Needle

touch lightly

Should

0.05-0.1

( 1) Loosen

between

(2) After adjusting the clearance between the needle and the rotary hook point. adjust the needle guard so that the needle

and the needle guard lightly touch each other.

• After the adjustment. securely tighten The needle guard on the rotary hook is to prevent

•

Be

2.

Needle bar

sure

screws®.

0.05

to

readjust the rotary hook needle guard position when replacing the rotary hook.

rise

mm

®and

and 0.1 mm by moving rotary hook 8

and height

Rotary hook

©.

and adjust the clearance between the needle and the rotary hook point

pornt

screws®.®

to

right

or

left.

and

©.

the

needle from striking the rotary hook point.

to

somewhere

t

1

I

Rotary hook

point

\:

·.....----'-

Needle

1.5

mm

mm (8838)

2.2

(8837)

8

r

Needle bar rise

( 1) Turn the feed adjusting knob

(2) Loosen screws 8 for lower shaft spiral gear

hook point lowest position.

• The rotary hook shaft has a screw seat.

• When tightening screws 8 for lower shaft spiral gear

Needle bar height

(1)

Turn the feed adjusting dial

(2) Loosen screws

the rotary hook point the

•

After the adjustment. tighten screw 8 securely.

will be at the center line of the needle

8.

and move the needle bar up

to

needle.

to

1.5 mm

Model

118-837 1

18-838

position

so

position 0

(8837)

Application

Thick materials Thick materials

0.

8.

and move lower shaft spiral gear 8 to the right

when

the above adjustment cannot

{8837)

or 2.2

or 4

or

down to adjust the clearance between the top

mm

or

left so that the rotary

the needle rises 2.4 mm with

be

8.

make sure that it is in line with the screw seat.

(8838).

(8838). when the rotary hook point is in line

Needle bar rise

Standard Thread cutter Standard

2.4

2.8

mm mm

2.4

883

7.

2.8 mm

made with the pinion gear.

of

Feed

mm

0 0

with

8838

from its

the needle eye and

with

the center of

control

dial

Thread cutter

0

-61-

----------

-------

IT]

CLEARANCE BETWEEN ROTARY HOOK

AND

NEEDLE PLATE

1.2

~

mm

* Rotary hook 0

hook

0 and needle plate

is

s~t

to the proper height by the rotary hook shaft bushing upper so that the clearance between rotary

f)

is

set

as

required (1.2 mm).

m CLEARANCE BETWEEN ROTARY HOOK

AND

BOBBIN CASE OPENER

* Adjust the clearance between rotary hook 0 and

bobbin case opener bobbin case opener direction) by

case opener

•

After the adjustment. tighten screw 8 securely.

f)

to

about

0.2

mm (when the

f)

has retracted fully in the arrow

loosening screw 8 and moving bobbin

f)

to

the right or left.

1. Needle to rotary hook point gap . • . . . . • . • . . . • Rough seams. skipped stitches. thread breakage. needle

breakage

Needle bar rise. height • • • . . . . • • • . • . . • . . . . . . • Rough seams. skipped stitches. thread breakage

2.

3. Rotary hook to

4. Rotary hook

•

Be

sure to readjust rotary hook lubrication when the rotary hook

needle plate gap . • • • . . . • . . . . • Too small: improper stitch tightening

to

bobbin case opener gap • • . . .

•Too

large: loose stitches. improper stitch tightening

•Too

small: shuttle body damage

-62-

is

replaced.

[!]

PRESSER FOOT HEIGHT

1.

Raise

the outer presser foot 8 with the presser bar lifter lever

(Check that the distance from the needle plate 0 top to presser foot 8 bottom is 10.5 mm.)

2.

Insert a

3. Loosen screw

Firmly tighten screw 8 after adjustment

•

The presser bar flat spring will cause the vibrating presser foot to Be

•

10.5

mm block underneath the vibrating presser foot

8.

and

careful not to turn the presser bar

ADJUSTMENT

0.

G.

raise or lower either the vibrating presser foot 8 or presser bar 0 to adjust.

is

completed.

drop

when the screw 8

0.

is

loosened.

I

i

I

~

I~

-63-

[I]

FEED

DOG

HEIGHT

About 1

.0

ADJUSTMENT

mm

Turn the lowest

2

Loosen that feed needle plate

•

F1rm completed

machme

p0S1t1on

screw

ly ligh

pulley

f)

and

dog 0 will

ten

screw

unttl feed

ra1se

nse

f)

dog 0 drops

or

lower

about

1 0

after the adJUStment

th

e feed bar 0

mm

above the

to the

so

1s

ltl

When

ltl

When

the feed dog

the

feed dog is too

is

too high:

• The feed

• S

t1t

d1al

low

: . . . . . . . . • Stnches wtll

d1al

ches

dog

will stnke the ne

will

be lar

be

smaller

ger than

than spec1f1ed

edle

spec1

plate.

f1ed by

by

the feed r

the feed

egulato

regulator

r

- 64 -

[!]

VIBRATING PRESSER FOOT

• When the needle descends. the lifting presser foot must touch the feed dog before the needle point reaches the feed dog. When the

needle drops. the needle pomt must clear the feed

AND

LIFTING PRESSER FOOT

AND

NEEDLE

dog

before the lifting presser foot rises.

TIMING

ADJUSTMENT

When the needle goes down.

Needle

Feed

dog

1.

Loosen two screws

2. Adjust vibrating presser foot wheel&.

• After the adjustment. tighten screws 8 securely.

8.

0.

lifting presser foot 0 and needle timing by turning by turning upper feed eccentric

When the needle goes up.

' I

' \

I '

'<,·-----.

·\

Needle

\

Feed

dog

l

t

III UPPER FEED

• This machine is assembled so that upper feed (needle feed) matches lower feed. (The reference line on the needle feed rock crank matches the reference

the upper and lower feeds

• If

1.

Loosen nut

2. To decrease upper feed. move nut 8 toward feed driving shaft

3. To increase

• After the adjustment. tighten

ADJUSTMENT

do

not match. increase

0.

upper

feed. move nut 0 toward the

nut

line on the collar.)

0 securely.

or

decrease upper feed

8.

tip

of

needle feed rock crank

as

0.

follows

I '

I

I 1

I I

lcl

I I

•

',

1,

'

' I '

to

match sewing conditions.

/

_,.

I

---

I

Upper feed

Lower

feed

-65-

@]

VIBRATING f-kESSER

FOOT

AND

* The v1bratmg and l1ftmg presser feet move * The vibratmg and l1ftmg presser feet

will

LIFTING PRESSER FOOT VERTICAL STROKE

up

and

down

111 alternate steps.

normally

r1se

the same d1stance.

I I

~

:---

'

,'

\

-·

--

\

' '

'~,

---

\

J...

....

'

Feed dog

ADJUSTMENT

1. Loosen wmg

2. Loosen bolt 0 .

3. L

ower

4. Turn the mam pulley. St

•

M

ake

nut

both the

sure there is

v1bra11ng

0 and t1ghten the walk1ng bar eccentrtc crank 0

no

0 and

op

play m th e walking bar sha

l1f

11

ng 0 presse r feet to the need le plate O.

when th e thread take-up crank

at

th e

cen

ter of the l

f)

IS level

ft

0 .

as

shown

in the f1

ong

gure

ax1s

.

- 66 -

GAUGE PARTS LISTS FOR DOUBLE NEEDLE

LOCK STITCH SEWING MACHINES

Models L

T2-8831,

8832,

8835,

8836,

8838,

8882

* Gauge parts lists for double needle lock stitch sewing machmes are shown below.

Needle

Plate

Type

A

LT2-a831

I·

11

88321-11

-13.8..-

29

---

I~

...L

T~

-----·--------

Type

-----.--------

Type

~835

-------------··········-------------------

Type

s

-

·22.2-

-------··········---------·

A'

LT2·883t

8832 1·3)

"~~.

#-

zo

..

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

A.

LT2-a831

88321-51

(-3. -5)·a836 8882

f~t§J

-1~--

·.

~-22.2-

8 LT2-8832

0~

1·31

-·-·~

1·51

1

(Thread

cutter

-31

Feed

Dog

Type

A LT2-a831

a832

1-11 (-11

•£t

Type

A'

LT2-a831 1-3.

a832 (-3. 8835·8836 a882

-51

Needle

eye

r---

eye

Type

•

4

Type

A LT2-a831

~~

a LT2-8832

·~

a·

LT2-8832

Presser Foot

1-1.-3.-51 a832 (-1. -3. aB35 (-3.

-51

(Thread

aa35

(Thread cutter

Slolless

(Thread

a835

IThread cutter

-51

Slot

cutter

~

·31

-31

A

-51

Needle Clamp

Type

A LT2-8831·a832

Type

a LT2-8835·8836

8882

j

r

j

•

I

t§.-3-

'-··20--

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

Type

a·

¢1§1.

--------

Type A-LT2-B838

LT2-a831

LT2-a832

LT2-a835

LT2-a836 LT2-a838 LT2-a882

--

----

8835

-----··

(Thread

LT2·8832 IThread cutter

J

······---

......

---

...

~--32·-~

t~

SJ

'--2S.Z

_.

Model

(Standard)

(Thread cutter) (Standard) (Thread cutter)

~

-------·-·

-51

cutter -3.

-51

0

~

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

Type

a LT2-a832

1-~

Type

a·

·~ifr

Subclass Needle plate

(Thread

a835

LT2-a832 (Thread cutter

aB35 (Thread culler

-1

-3

-5

-1

-3

-5

-3

-5

-3.-5

-3

-5

cutter

(Thread culler

Needle

tJoi.S

__l_fl-

*

Needle

t>2

Type A Type A' Type A" Type A Type A' Type A" Type a Type a· Type A"

Type a· Type

Type A'" Type A"

eye

-31

-51

A"

Type

A'

LT2-8836·8882

•

Feed

Type A Type A' Type A Type A' Type a

Type Type A' Type a Type a Type Type A' Type Type A'

Wff//4

dog

a· Type a·

a·

A"

Vibrating.

:\

Slolless

Presser foot

-:1

Type A

Type a

Type A

Type a· Type A'

lifting

Type A'

Type

C LT2-a838

presser feet

Needle clamp

Type A

Type a

Type

C

Type A

-67-

ltl Please

LT2-

8831

co

nsult your dealer for

gauge parts

pr1c

es and delivery dates of gauge parts other than thos e

shown bel

ow

Double st1t

1 I 1 6" ( 1 6

1/

8"

(3 2

5/

32"

(4

3/

16" (4.8

1/

4"(64

5/16"

(7

S1ze

ch

sew1ng (0 5

mm)

0

mm)

9

mm)

Su

bcl

-3

- 1

-3

-5

-3

-5

- 1

-3

-5

- 1

-3

-5

-3

-5

ass

Needle

cla

mp

N

eedle

plat e

15880

1-001 1

158808-001

158794-001

158796-001 116509-001

1

58791-001

158792

-001 1

I

58793

-001 11

42111-001

142111

11

116503

1 117158-001

112603-001

117133-001

117368

11736

112605

144882

7370-001

4950-001

7369

50850

-001

12604

-001

7-001

-001

r eed

dog

1

42110-00

1078-001

15

117366-00

95

1-001

114

11

7134-00

112659

1

112660-

-001

17365-00

001

2661-00

Presser foot

1

1421

151076-001

1

114948

116502-001

1

112638

1

112642

1

112645

05-00

-001

-00 1

-001

Bed sl1de L

1

112606-001

318" (9 5

7/16" (11 .1

1/ 2" 5/

1"

1-1/ 4" (31.8

1-11

(I

8"

( 15.9

(25.4

2·

mm)

2 7

mm)

(38

mm)

.1

mm)

-3

-5

-3

-5

-3

1/

8"

(3 2

3/ 1

6"

1 /4"' (6.4

158798

1

58809

158797-00 158795-001

158805-001

158799

158800

mm)

(4 8

mm)

-001 11651

-001

Gu1de

116506-101

1448

1

51596-001

1

11

6505-001 116507

1471

11

6504

118945

presser

149311-001

117281

1

-001

49312-001

8 1-101

-001

76-001

-001 1

-00 1

foo

t

151598-001

116511 116512-001

14 7178-001

165

118947-001

~

0-101

-001

08 -001

116498

1

11

116500

147177-001

11

118946-001

-001

51597-00

6499-001

-001

6501-00

1

145721 -001

~

Ill Please consult your dealer for pnces and delivery dates

of

gauge parts other than those shown below.

LT2-B832

Double

st1tch

1/16"

(1.6 mm)

1

/8"

(3.2 mm)

5/32"

(4.0 mm)

31

16"

(4.8 mm)

1

/4"

(6 4 mm)

gauge parts (standard)

S1ze

sewmg (0.5 mm)

Subclass Needle clamp

-3

-1

-3

-5

-3

-5

-1

-3

-5

-1

-3

-5

158801-001

158808-001

158794-001

158796-001

158791-001

158792-001

Needle plate

142111-001

117370-001

114950-001

117369-001

116503-001

150850-001

117158-001

112603-001

117133-001

117368-001

112604-001

117367-001

Feed

dog

142110-001

151078-001

117366-001

114951-001

116509-001

117134-001

112659-001

117365-001

112660-001

Presser foot Bed

142105-001

151076-001

114948-001

116502-001

112638-001

112606-001

112642-001

slide l

t

5/16"

(7.9 mm)

318"

(9.5 mm)

7 I

16" ( 11

.1

1/2"(12.7mm)

5/8"

( 1 5.9 mm)

1-1/4"

(31.8 mm)

1-1/2"

(38.1 mm)

2"

(50.8

mm)

2-1

/6"

(55.0

When

using 2"

150840-000).

( dealer.

mm)

(50.8

mm) or 2-1

and rotary hook

-3

-5

-3

-5

-3

-5

-3

-5

/6"

baseL

112605-001

158793-001

158798-001

158809-001

158797-001

158795-001

1

58799-001

158800-001

158802-001

158803-001

(55

mm) gauge parts. replace rotary.hook base bushing L (

( 1

50838-001)

144882-001

116506-101

144881-101

151596-001

116505-001

116507-001

116504-001

118945-001

144951-001

14

7560-001

and R (

150837-001

112661-001

116510-101

151598-001

116

511-001

116512-001

116508-001

118947-001

144947-001

147561-001

).

Consult your local industrial sewing machine

112645-001

116498-001

151597-001

116499-001

116500-001

116501-001

118946-001

144949-001

14

7562-001

150839-000)

145721-001

150836-001

and R

GUide presser foot

1/8"

(3.2 mm)

311 6" (4.8 mm)

1 I 4" (6.4 mm)

149311-001

117281-001

149312-001

~

It! Please

LT2-

B832

consult

your dealer for

pr1

ces and delivery dates of gauge parts ot

gauge parts (thread cutter)

her

than those

shown below

S1ze

3/32"

(2

4 mm)

1/

8"

(3 2 mm)

5/32" (4.0 mm)

3/16"

(4

8 mm) 1

1/4"(64mm)

5/16"

(7

9 mm)

3/8"

(9 5 mm)

1 /2" ( 1 2 7 mm)

Subclass Needle clamp Needle plat e

59398

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

1

58804

158794

1

-001

58796

5879

1-001

58792-00

58793-001

58798-001

58797-00

-001

1

159400-001

155722

158785-001

155724

1

155851-0

158783-001

1

15585

1594

155855

1

15 1

1

-001

-00

58784-001

01

3-00

02-001

-001

49946-00

5857-001 59404-001

49677

-001 149675

Feed dog

148697-001

148698-001

148699-001

148700-001

1

148701

148702

148703-001

148 148

1

.1

58756-001

149692-001

149691-001

1

149938-0

149978-001

149

-001

704-001 70

5-001

0 1

676

-001

Presser foot

148679-001

148685-001

148681

148689

1

148

14

148693-001

14869

149689

14

149

1

-001

48683

-001

687

-001

869

1-001

5-001

-001

9687-001

942-00

940-001

49673-001

4967

1-001

148581-00

148585-00

149

697-00

1

149685-001

Bed

1

slide L

148528-001

5/8"

( 1 5 9 mm)

3

/4"

(19

.1 mm)

7 /

8"

(22 .2 mm)

1" (25.4

mm)

6. Refer to th e table

adjustable

3/32" 1 /8"

3/ 16" 1 5/16"

length

S1ze

/4"

3/8"

1

/2"

5/8"

31

4" 59.1 mm

1"

Connectmg rod leng th

5132"

-3 158795-001

-5

below

connectmg

66

65.4 64 6 1.9 mm 11.9 60

55

158806

158807-001

1

58805-001

to adju

St t

rod.

.2

mm mm mm 14. mm

.

.4 mm

.9 mm 5.9 mm

-001

149956

149954

1

14

-001 149949-001

-001

50526-001

50534-001

9966-001

149948-001

150523

15

-001

0531-001 150532-001

14996-0

0 1

• The ne edle hole m the feed dogs

~

he

length of the

Reference

(A)

d1men

16.2 mm

15.4 mm

10.4 mm

9.1 mm

s1on

mm

Connectmg rod assembly

149952-001

149950-001

50524-001

1

49962

149958

150528-001 149986-00 150536-00 1

-001

149970

ts for extra-heavy

rT±

Connect1ng rod length

<A>

3

-00

-001

thr

ead. (· mark)

3

1

Thread

w1p

er

gu1d

1

- 70 -

Ill Please consult your dealer for prices and delivery dates

LT2-B835 gauge parts (standard)

of

gauge parts other than those shown below.

l

r

I

t

I

Size Subclass

/8"

(3.2 mm)

1

5/32"

(4.0 mm)

31

16"

(4.8 mm)

1

/4"

(6.4 mm)

5/16"

(7.9 mm)

3/8"

(9.5 mm)

5/8"

( 1 5.9 mm)

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

Needle clamp Needle plate

150885-001

150843-001

150844-001

150830-001

150845-001

150846-001

156530-001

LT2-B835 gauge parts (thread cutter)

1

/8"

5/32"

3/16"

7

132"

1

/4"

5/16"

318"

7 I 1

5/8"

S1ze

(3.2 mm)

(4.0 mm)

(4.8 mm)

(5.6 mm)

(6.4 mm)

(7

9 mm)

(9.5 mm)

6"

( 1 1 . 1 mm)

( 1 5.9 mm)

Subclass

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

Needle clamp

150885-001

150843-001

150844-001

183180-001

150830-001

150845-001

150846-001

S01639-001

15653-001

117369-001

150850-001

117133-001

117367-001

144882-001

144881-101

116507-001

Needle plate

1

55

722-001

155

724-001

155851-001

156816-001

1

55853-001

155855-001

15585

7-001

S01644-001 S01646-001

149954-001

Feed

dog

148698-001 148699-001 148700-001 148701-001 148702-001 148703-001

156818-001 148704-001

148705-001 149692-001 149691-001 149939-001 149938-001

149949-001 149948-001

Feed dog Presser foot

114951-001

116509-001

112659-001

112660-001

112661-001

116510-101

116512-001

Presser foot

148685-001 148681-001 148689-001 148683-001 148687-001 148691-001

156819-001 148693-001

148695-001 149689-001 149687-001 149942-001 149940-001

S01641-001

149952-001 149950-001

114948-001

116502-001

112638-001

112642-001

112645-001

116498-001

116500-001

Connecting rod

complete gUide

148581-001

148585-001

149697-001

S01643-001

149958-001

Thread wiper

148528-001

149986-001

t

LT2-B836 gauge parts

Subclass

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

-3

-5

/8"

1

5/32"

31

16"

1

/4"

5/16"

318"

S1ze

(3.2 mm)

(4.0 mm)

(4.8 mm)

(6.4 mm)

(7.9 mm)

(9.5 mm)

Needle clamp Needle plate

150885-001

150843-001

150844-001

150830-001

150845-001

150846-001

117369-001

150850-001

117133-001 117367-001

144882-001

144881-101

-71-

Feed

dog

114951-001

116509-001

112659-001

112660-001

112661-001

116510-101

Presser foot

155463-001

155455-001 155457-001

155453-001

155459-001

155461-001

Gauge

*

LS2

parts list

-B837

gauge part application s differ from

other model

s.

1) Standa

2)

Welting

rd

feet

8 A

f

A 8

®

Wa

lkmg Foot

W•lhOul

groove

(lor

S1ze

(3

"" (40

(4 .8

(6.4 (7 9 (9.5

(12.7 (15

standard)

read

.2

mm) mm) mm) mm) mm) mm)

.9 m

Jrnnmor)

mm)

m)

150962-001

®

Walk1ng

1

51520-00

151

522-001

15

1524-0

1

51526-001 151528-001 151530-001 151

532-001

15 1

534-

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

W1th groove (lor !h

1

/8"

5132

3/16""

1/4"' 5/16" 3/8"

1

/2"

5/8"

Foot

01

001

Part

Part No.

1

No

® Presser

Asse

mbly

1

83007-00

183181-001

® Presser Foot

Assembly

183008

183014-001

83

015-

1

Foot

1

-001

001

3)

Welting

4)

W elting feet

feet

with

teeth on presser

with

teeth on presser foot

f -

8 A

foot

S1ze

3/16"

(4 8 m m) 1

1/

4"

(6.4

5/16"

(7 9

S1ze

31

1

6"

(4.8

1

/4

"

(6.4

5/16"

(7 9

mm) mm)

mm

) 15

mm

) 15

mm

) 15

Part No.

®

Walkmg

51536-001 1

151538-001

151

® Walk1ng F

Foot

540-00

1542-001

1544

-00 1

1546

-001

1 1

Pan No.

oot

® Presser Foot

Assembly

83016-001

1

83017-001 83018-00

® Presser

Assembly

183019 183020 183021

Foot

-001

-00

1

1 1

/*"'.. 5) Curved welting feet.

A

f

8

3/16" 1

/4" 5/16" 3/8"

1

/2"

Size

(4.8 mm) (6.4 mm) (7.9 mm) (9.5 mm)

(12.7

mm)

@ Walkmg Foot

151548-001 151550-001 151552-001. 151554-001 151556-001

Part

No.

® Presser Foot

Assembly

183022-001 183023-001 183024-001 183025-001 183026-001

1

6) Double welting feet

A 8

7) Feet with teeth, right

B A

3/

16"

/4"

1 5/16"

Size

(4.8 mm) (6.4 mm) (7.9 mm)

@ Walkmg Foot

151558-001 151560-001 151562-001

@ Walkmg Foot

151564-001

Part

No.

® Presser Foot

Assembly

183027-001 183028-001 183029-001

® Presser Foot

Assembly

183030-001

8) Feet with teeth, left

J

8

9) Narrow type feet for leather

A 8

A

Part

No.·

Part

No.

® Presser Foot

Assembly

183031-001

Assembly

183032-001

@ Walking Foot

151566-001

@ Walking Foot ® Presser Foot

151568-001

Gauge Parts

S1ze

LT2-8838

VIbrating Presser Foot

~

e

L1f11ng

Presser Foot

Assembly

(009680-6-12)

~

Needle Clamp Assembly

Needle Plate

Feed

Dog

1/4

inch

(6.4

mm)

318

inch

(9.5 mm)

1/2

inch

(12.7 mm)

5/8

lOCh

(15.9

mm)

314

inch

(19.1 mm)

1

inch

mm)

(25.4

h

,

~

(116323-0-01)

153885-0-01

1

53890-0-0

153895-0-01

153900-0-01

153905-0-01

153910-0-01 183106-0-01 183105-0-01

1

183096-0-01

183098-0-01 183097-0-01

183100-0..01

183102-0-01 183101-0-01

183104-0-01

183095-0-01

183099-0-01

183103-0-01

~

153881-0-01

153886-0-01 153887-0-01

153891 -0-0 1

1

53896-0-0

1 53901 -0-0 1

153906-0-01

1

~

153882-0-01

153892-0-01

153897-0-01

153902-0-01

1 53907-0-0 1

(oTHERS)

I

r

~

II]

TOP COVER THREAD GUIDE

0

II]

ADJUSTING UPPER THREAD LENGTH

0

* Normally. the upper thread is passed

When using a thick thread. however. pass it through the foremost

hole 0 for smooth thread flow.

* The upper thread remainder can

adjusting screws Recommended standard

(Note)

When

using a thick thread. excessive tension may

retard the backward motion of the

0 on the tension complete.

length

as

shown at nght.

be

adjusted

is

32

to

35

movable knife.

with

mm.

the

[TI

ANTI-SPINNING SPRING

* If the bobbin spins during thread ·trimming. the thread

may get between the rotary hook and bobbin. possibly causing trouble when restarting the machine. A conical spring is placed under the bobbin

• Antr-spsnnsng sprrng F th. t .

~

BobbmJ

(Note)

When adjusting the lower thread tension. place the

anti-spinning spring under the bobbin.

tangled inside the bobbin.

to

prevent bobbin spinning.

or

may slip out

. . . . O l For thick materials

rn

1 or

ma ena s

1

I

0

BOBBIN

Use a bobb1n 0 made dunng

thread tnmm1ng

2 Insert the bobb1n 1nto the

opposite

3. Insert the ant1-spmnmg spnngs

to t

he rot

at1ng

of

light

bobbm

d1recuon

alloy

to

prevent sp1nn1ng

case

111

the d1recuon

under

the

bobb

1n.

(jROUBLESHOOTING

GUID~

LT2-B831

[

8835·8836·8882

·8832

J

~--T_ro_u_b_le--~~

Thread breaks

~~-------C-au_s_e------~~

Damaged rotary holding slot in the needle plate.

~

Improper upper

~

tension.

Improper needle

-

rotary hook timing.

1--

InsuffiCient lubncat1on to

f--

the rotary hook assembly.

hook

thread

and

~~-------C-he_c_k------~~~

Upper thread tension.

-

Bobbin case opener gap.

1--

Rotary hook and plate gap.

Needle bar

~

Rotary hook

Needle and point

height. stroke and height.

gap.

rotary hook

needle

l1ft

stroke and

lubrication.

~

______

f---

-

H

f---

R_e_m_e_d_v

Polish the rotatmg hook

holding slot.

Refer

to

Refer

to supplementary instruction manual.

Set

the rotary hook and

bobbin case opener gap

0.2 mm.

Set the needle and rotary hook point gap

Check that the needle plate

rotary hook gap

and

approx. 1

AdJuSt

the needle

AdJuSt

the lubncatlng

to

supply Refer to mentary mstruct1on manual.

p.

______

''Thread Tension".

p.

12

of

the

to

0.5 mm.

.3

mm.

bar lift

the rotary hook.

7 of the supple-

011

~

to

IS

Improper

1-

spring tension and stroke.

Rotary hook point

-

damaged.

Damaged needle hole in the feed dog.

~

Improper threading. Thread1ng

thread take-up

~

Thread stroke and tension.

take-up

~

t

I

Improper t1on.

H

Bent or

·Refer to the "Thread breaks" section (above). Also check below.

needle mstalla-

blunt needle.

Needle

groove direction

H

Loose threads

l

~

Bobb1n sticks.

H

When using a machine for medium-thick materials.

...__

the thread does not tighten

properly

rials.

with

some mate-

spnng

~

Refer to 'Thread in the supplementary struction

Polish the pomt.

Polish the needle hold the feed dog.

Refer to "Upper Threading".

Install the needle proper direction.

Replace

Replac-~

Replace presser foot (for med. thick materials). Replace dog (for med. thick materi<tlsl

the needle.

the bobbin.

with

manual.

rotary

with

a

a slotted feed

Tens1on"

1n-

hook

1n

the

slotted

1n

~--T_r_o_ub_l_e

__

~l

~~

_______

c_au_s_e------~~~

~-------C-h-ec_k------~~

~~------R--em

__

ed_v

______

~

Excess1ve

puckenng

Upper thread high.

Lower thread high.

H

Thread take-up spnng

---1

too strong.

Thread

-

1-

stroke is too large.

Presser foot pressure too weak.

11

Sewing speed

-

(motor rotation

When

med.-thick material. thread may

-

depending on the thread and matenal.

Improper timing.

14

Damaged knife

H

Movable

f--

rotary hook stop gap large.

tens1on

1s

tens1on

1s

take-up spnng

1s

too fast

IS

too fast).

us1ng

a machme for

tighten excessively

thread trimmer

or

bent movable

tiP.-

kn1fe

tip

1s

too

and

too

IS

Upper thread tens1on

Lower thread tens1on

,...-.-

Thread take-up spnng tenSIOn.

Thread take-up

-

stroke.

Presser

foot

pressure.

spnng

Set the upper thread tens1on

Set s1on

Set

-

_____,

spr1ng POSSible.

Set spring stroke

possible.

Increase presser foot pressure.

Decrease (replace the motor

w1th

Replace presser th1ck

AdJUSt tim

Replace the movable kmfe.

Set and rotary hook stop gap to

as

weak

as

poss1ble.

the lower thread ten-

as

weak

as

poss1ble.

thread

the

tens1on

thread

the

a smaller one).

With

foot

matenals).

thread trimmer

mg.

the movable

0.05-

as

sew1ng

a

(for med.-

0.2 mm.

take-up

weak

take-up

small

speed pulley

slot less

kn1fe

as

t1p

I

t

r

I

,.

Improper tens1on release

f--

adJUStment.

,........-

Upper thread cuttmg misses

Lower thread

cutting misses

~

Improper

~

rotary hook

Movable

---l

small (1nsuffic1ent movable knife

Lower thread loop spread-

~

ing does rotary hook.

Movable low.

Rotary hook is too

Damaged

knife tip. Movable knife stroke

small.

needle and

timmg.

kn1fe

extens1on).

not

kn1fe

or

bent movable

stroke

match the

t1p

IS

too

h1gh.

15

too

IS

Bobbin case opener gap.

Needle and rotary hook pomt gap.

H

-

Needle

1--

hook gap.

Needle bar height.

H

Lower thread loop spread-

-

mg.

Movable knife posit1on.

Rotary hook height.

plate and

lift

stroke and

-78-

rotary

1---

~

1---

-

W1th

the disengaged. tens1on release lever and

presser bar mm.

AdJUSt

bobbin case opener gap

0.2 mm.

Adjust the rotary

pomt and needle gap

0.05

AdJuSt

needle plate gap

1.3 mm.

AdJUSt stroke and

Install the slider assembly so needle

Use normal lower thread loop spreadmg vanes and new models).

Check the rotary hook height.

Check the rotary hook

height.

Replace the movable knife.

Press the slider assembly

out

tens1on

the rotary hook and

mm.

the rotary hook and

the needle

It

extends

s1de.

spreading

to

the needle side.

release

adJUSt

lift gap to 1 .5

hook

to

approx.

he1ght.

bar lift

out

to

(loop

with

rotary hook

the

to

the

old

~---T-ro_u_b_le--~~

Bobbin races

during thread

cutting.

L---------------~

~~-------c_a_us_e

Lower thread in normal direction.

,_H

Bobbin wound over

Racmg prevention spnng tens1on

1s

too

______

not

runn1ng

weak.

~ll

~------C_h_e_c_k------~~~

80%.

Bobbin thread.

~------R_e_m_e_d_v

AdJUSt

so the lower thread

winds

in tion the rotary hook rotates.

~

Adjust lower thread

amount to 80% of bobbin capacity.

Replace the racing tion spring.

____

the same direc-

preven-

~

Stitches thread casts off at start

of

sewmg.

sk1p

or

Needle up stop position

......

too

high.

After thread cutting. the !ower thread is not held by the lower thread tension spring.

1-

Improper feed dog height.

Thread take-up spnng tenSIOn

IS

--

I-

H Needle

high. or the stroke

too large.

Upper thread from the needle

hold

1s

Presser foot for thick materials (slotted) used.

Thread does not come eas1ly

off the spool stand.

IS

short.

too thick.

is

IS

is

Height from needle needle plate after thread cutting.

1--

Feed

dog

-

Thread take-up sprrng.

he1ght.

tap

to

:1---------------------------------lf

be1ng

to

Refer detector adjustment.

Replace the lower thread tension spring.

Adjust feed

mm.

Decrease thread take-up spring tension. or stroke length.

Decrease strength.

A eplace

Replace presser foot.

Adjust so thread feeds easily.

needle position

dog

he1ght

pre-tens1on

with

finer needle.

with

slotless

to 1

Pre-tens1on

1-

After thread cutting.

thread trailing from stroke needle hole

is

short.

H Thread take-up spnng

L------------------------~

Improperly polished hook.

H

L.---------___...1

T

ens1on engage trng.

rl~_l_m_p_r_o_p_er_w

Needle

Needle hits the thread w1per

due to scauered stopp.ng .n the needle position.

up

weak. needle plate after thread

H

I-

~------l

V-belt tension

H

'-----------~~

Feed

~

small for the needle and

thread.

IS

too

hrgh.

s

too large.

1

kn1fe

d1sc

during

up

dog needle

does not

thread cut-

__

ip_e_r_p_o_s_i_ti_o_n_.~:~------------------------~

stop positron

rs

weak. L

is

too

Thread stroke.

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

Tens1on

ment.

~

Herght from needle tip cutting.

L.-----..-

t--

Feed dog needle hole.

take-up

spnng H

release move-

to

Decrease

strength.

Decrease thread take-up

spring stroke length.

L-----------------------~

Polish movable knife.

L...---------------'

Adjust the tension release.

1

A~u~t~thread~p~.

1---

~

Refer detector adjustment.

r

1 Adjust V-belt tension.

Replace the feed dog.

pre-tens1on

or

replace the

to

needle position

(!

ROUBLESHOOTING

~---

T

-

ro

_

u

_

b

_

l

e

--~~

Ll

_______

GUID

c

_

a

_

u

_

s

_

e

------~

~~

L

_______

~

c

_

h

B837

LS2 -

[

LT2-B838

_

e

_

c

_

k

------~~

J

LI

_______

R_em

__ e_dv

______

~

! '

Upper breaks

Lower

breaks.

thread

Needle bent. needle crushed

Needle

mcorrectly

ed.

Wrong

threadmg

Upper

thread tens1on

tight.

Wrong clearances between rotary hook and opener.

Wrong

needle and r

hook

t1m1ng

.

Wrong

thr

eadmg

Lower thread tens1on t tight.

Bobbtn

sta1ned

lint.

mstall-

bobb1n

.

with

liP

too

case

otary

oo

otl

or

Needle.

dtrect1on.

Needle

Threadmg

Up

Thread

lntens1ty of l tens 1

per

0n

.

thread

mg

.

regulator

tens1on.

ower

screw

thread

.

Replace faulty

Install needl dtrect1on

See

the

thread1ng.

See the tens1on

See

the

rotary

hook

See

the

r01ary

hook

See the sect10n for thread1ng.

Ad1us1

Remove

thoroughly

section

sect1on

t1mmg

sectoon

t1mmg

10

proper

ltnt

.

needle

es

1n

for

needle

adjustment

for needle

adjustment

tens1

and otl

correct

upper

thread

and

lower

on

Uneven

ches

Stit

stitches.

sk1p

.

Needle bent. needle crushed

Presser small

Wrong

Needle bent. needle crushed

Needle ed

Wrong

Presser small

.

Wrong hook

foot

feed

dog

upper

.

Incorrectly

threadmg

foot

needle

t1m1ng

.

pressure t

he1ght

feed

!lmtng

mstall-

pressure

and rot

t1p

oo

t1p

too

ary

Needle.

Presser

foot

pressure.

dog he1ght.

Feed

.

Needle.

Needle he1ght.

Thread1ng.

Presser

direct1on

foot

pressure.

and

Repi

LJCP. f;lll

lty

n m~d

lt'

See t

he

section for

foot

ad1ustment.

See the sect1on dog

he1ght ad1ustmen

See

the sec

presser

foot foot and needle ment

Replace faulty needle.

See the mg

the needle.

See the thread1ng

See t

he

foot

ad1ustment.

See

the

secuon

rotary

hook

section

t1on and

llftmg pr

t1m1ng

for

t1m1ng

presser

for

v1brat1ng

for

presser

needle

adtustmenl.

feed t.

esser

adjuSt·

lnstall-

upper

and

Wr

ong

upper

feed t1mmg

.

See the

sect1on presser foot foot

and

needle ment.

for v1brating

and

llftong presser

tim1ng adJUSt

·

L---[

_

Trouble

_____,

,

.______

I _

ca_use

____.I f.______

Che-ck

___JI

, IL----

Rem

-e

dy

----'

Threads loose.

Needle breaks.

Thread take-up

weak.

Upper

thread tens10n t

weak.

Lower thread tens1

weak.

Needle guard

Needle 1ncorrectly ed.

Needle bent. needle crushed.

Wrong

t

iming

.

Wrong hoo

k t

1mmg

Needle guard maladJuSted

sprrng

too

on too

maladJuS

needle and feed

needle and rotary

ted.

Install-

oo

up

Thread take-up SIOn

and movement

Upper thread tens1on.

Lower thread tens1

Needle he1ght.

Needle.

sprrng ten-

on

d1rect1on and

See the section for thread tens1on

See the sect1on for thread t

ens1on.

.

See the section for thr ead tension.

See the sect1on rotary hook

See the section ing the needl

Replace faulty needle.

See the section for needle and feed timtng ment.

See the sect1on for needle and

rotary

hook

See

th

rotary hook

lor

needle and

t1mmg adjustment

for

install-

e.

adJust-

t1m1ng

adjustment

e sect1on for needle and

t1mmg ad1ustmen1

Brother LT2-B830 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual