Juki M0-6000S, M0-6900G, M0-6900R, M0-6900J Manual

PREFACE

This Engineer'sManual is written for the technical personnel who are responsible for the service and maintenance of the machine.

The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes "Standard Adjustment", "Adjustment Procedures", "Results of Improper Adjustment", and other important information which are not covered by the Instruction Manual.

It is advisable to use the relevant Instruction Manual and Parts List described below together with this Engineer's Manual when carrying out the maintenance of these machines.

In addition, for the motor for the sewing machine with thread trimmer, refer to the separate Instruction Manual or Engineer'sManual for the motor. And for the control panel, refer to the Instruction Manual for the control panel. This manual gives the "Standard Adjustment" on the former page under which the most basic adjustment value is described, and on the latter page "Results of Improper Adjustment" under which stitching errors and troubles arising from mechanical failures are described together with the CIAdjustment Procedures".

~	MO·6900S	MO-6700S	MO·6900G	MO·6900R	MO·6900J
N
	Part No.	Part No.	Part No.	Part No.	Part No.
Instruction Manual	29351707	29351707	29351707	29356409	29363009
Parts List	29351806	29352408	29352309	29356201	29362803

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From the Library of Superior Sewing Machine & Supply LLC

CONTENTS

1. SPECIFICATIONS ..........	•....•..•••.•.••••...•••..••••.••.••••••..•.••...				••..•........	•..•••.•..•••.••.•...				1
(1) MO-6700S SERIES ...........................................................................................................										1
(2) MO-6900S SERIES ...........................................................................................................										2
(3) MO-6900G SERIES •••••••..•••••••..•••••••...		••••••..••••..••••.•••••.•.•••.•....		•.••...	•••••...	•.•••••.•.•.•.•••.•.•.•••.•.				3
(4) MO-6900R SERIES •.••.•••••••••••.••••.•••.••••••••.•••••.......•.•..••..•••...				•.......	•.•.•••.•.••..•...		•..••.....	•.•.•...	•	4
(5) MO-6900J SERIES.............................................................................................................										5
2. MODEL NUMBERING SYSTEM		..••.••.•••..••••...••...	•.•••••••.•••.•..•.••.•...				•..•...	••.•...	•.....	6
3. STANDARD ADJUSTMENT ....••.•.•.•..•••..•.••••.••••••....				•......	•..•.•••.••......		•.•.••.••.....		•..	8
(1) Adjusting the needle height............................................................................................										8
(2) Positioning the throat plate ............................................................................................										8
(3) Installing position of the needle Clamp .......................................................................										10
(4) Adjusting the length of the lower looper holder
(Applicable only to MO-6.616S / MO-6916R, G, J series) ...........................................										10
(5) Adjusting the lower looper ._..........................................................................................										12
1) Returning amount of the lower looper ....................................................................................................										12
2) Clearance between the lower looper and the needle .............................................................................										12
(6) Position of the upper looper guide ...............................................................................										14
(7) Positioning the upper looper holder ............................................................................										16
(8) Positioning the upper looper ........................................................................................										18
1) Height of the upper looper .................................................................................................								~....................		18
2) Longitudinal position of the upper looper ................................................................................................										18
(9) Adjusting the double chain looper
· (Applicable only to M0-6~16S/MO-6916R, G, J			series)		...............................................					20
1) Returning amount of the double chain looper.........................................................................................										20
2) Longitudinal motion {Avoid motion) ........................................................................................................										20
3) Clearance between the double chain looper and the needle .................................................................										20
(10) Adjusting the height and clearance of the needle guard ..............							~..........................			22
1) For 1-needle or 2-needle overlock machine ...........................................................................................										22
2) For safely stitch machine ........................................................................................................................										22
(11) Adjusting the height of the feed dog .........................................................................										24
(12) Adjusting the tillt of the feed dog ................................................................................										24
(13) Adjusting the differential feed ratio ...........................................................................										26
(14) Longitudinal position of the feed dog .......................................................................										26
(15) Adjusting the presser foot ..........................................................................................										28
1) Adjusting the tilt of the presser foot ........................................................................................................										28
2) Adjusting the micro-lifting mechanism of the presser foot			......................................................................							28
(16) Positioning the upper knife arm shaft .......................................................................										30
(17) Positioning the upper and lower knives, and available overedge widths ..............										30
1) lower knife .............................................................................................................................................										30
2) Upper knife .............................................................................................................................................										30
3) Overdging width ......................................................................................................................................										30
(18) Resharpening of the knife ..........................................................................................										32
(19) Position of the thread cam (Applicable only to MO-6~16~ series) ........................										32
1) Adjustment of the thread cam .............................................			:...................................................................							32
2) Adjusting looper thread cam thread guides A and B and the looper thread cam nail .............................										32

From the Library of Superior Sewing Machine & Supply LLC

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(20) Adjusting the throat plate support .............................................................................	34
(21) Adjusting the feed mechanism cover presser ..........................................................	34
(22) Adjusting the looper cover .........................................................................................	36
(23) Adjusting the cloth chip cover ...................................................................................	36
(24) Adjusting the needle mechanism ...............................................................................	38
(25} Position of the upper looper lubrication pin .............................................................	40
1) Orientation of the lubricating pin .............................................................................................................	40
2) Setting the lubricating pin .......................................................................................................................	40
(26) Longitudinal momentum of the top feed dog (Top feed amount) ...........................	42
(27) Vertical momentum of the top feed dog ....................................................................	44
(28) Adjusting the height of the top feed dog ...................................................................	46
(29) Locus cut of the top feed dog ....................................................................................	48
(30) Adjusting the longitudinal position of the top feed dog ..........................................	48
(31) Adjusting the lateral position of the top feed dog ....................................................	50
(32) Position of the motion of the top feed dog ...............................................................	52
(33) Adjusting the feed bar guides A and B .................................................................	~.•.. 54
(34) Adjusting the top feed dog pressure .........................................................................	56
(35) Lifting amount of the top feed dog (when operating the pedal)••....••..••..••.......	•..••.• 56
(36) Height of the presser (pedal operation) .....................................................................	58

(37} Lifting amount of the top feed dog (when the presser lifting lever is operated) .•• 60

(38) Position of the thread guides and the looper thread take-ups ................................	62
(39) Adjusting soft chain making mechanism ..................................................................	64
1) Replacing·the parts with those exclusively designed for making soft chains .........................................	64
2) Adjustment value ....................................................................................................................................	64	-
3} Important points in adjustment ...............................................................................................................	65
(40) Position of the thread guides and the looper thread take-ups of MO-6900G (J) ...	66

4. ADDITIONAL INFORMATION AND PRECAUTIONS .....................................		68
(1) Thread tension ...............................................................................................................		68
1) Strength of tension spring .......................................................................................................................		68
2) Springs used for each model. .................................................................................................................		68
(2) Upper looper·..................................................................................................................		69
(3) Center-to-center distance of the upper looper holder ...............................................		69
(4) Caution in assembly ......................................................................................................		69
1) Application of sealant .............................................................................................................................		69
2) Precautions to be taken with respect to the lubricating components ...............................................		~...... 71
(5) Kinds of motor pulleys, belts and frame support plate bolts ....................................		72
1) Motor pulleys and belts ...........................................................................................................................		72
2) Pat No. of frame support plate bolt .........................................................................................................		73
(6) Inspection and replacement of the cartridge filter .....................................................		73
5. ADJUSTMENT OF THE NEEDLE HEIGHT AND LOOPER TIMMING ...........		74
(1) MO-60006. SERIES ........................................................................................................		74
6. TROUBLES AND CORRECTIVE MEASURES ...............................................		75
7. DIMENSIONS OF TABLE ••...	••.••..••••....•.•..•.•.••••.•..•••.•..••••..••.••••••..•••.•••.••..••.•..	87
(1) Semi-sunken type ..........................................................................................................		87
(2) Fully-suken type ..................	u ........................................................................................	88

From the Library of Superior Sewing Machine & Supply LLC

1.. SPECIFICATIONS

(1) MO-6700S SERIES

No.

Item

Specifications

1

Model

M0-67048

M0-67148

. M0-6716$

2

Description

1-neecile Overlock

2-needle Overlock

2-needle Safety stitch

machine

machine

machine

3

Stitch type F. S. T.

JISE13

JISE24

JISE13+D12

(USA standard : 504)

(USA standard: 514)

(USA standard =516)

4

Sewing speed

7,000,pm

5

Stitch length

. 0.8to4mm

1.5to4mm

6

Needle gauge

-

2, 2.4, 3.2 mm

2. 3.2, 4, 4.8 mm

7

Overedging width

1.6, 3.2, 4, 4.8 mm

32,4,4.Bmm

3.2, 4, 4.8, 6.4 mm

8

Differential feed ratio

Gathering 1 =2 (Max.1 : 4), Stretching 1 : 0.7 (Max.1 : 0.6)

9

Needle bar stroke

24.5mm

10

Needle tilt angfe

20·

11

Needle

ORGAN DC X 27 (Standard) (DC X 1can be used as well.)

12

Presser lifting amount

7.0mm

6.5nm

7.0mm

13

Presser foot pressure

49N (5Kg)

14

Stitch acfJUstlng method

By pushbutton

15

Upper knife

FlatknHe

16

Differential feed adjustment

By lever with micro adjustment medlanism

17

Weight

28kg

18

Lubrication

Gear-type automatic lubrication

19

Lubricating oil

• JUKI MACHINE OIL 18 (Equivalent to ISO VG 18)

20

Needle cooler

Optional

21

Needle thread heat remover

Optional

22

Micro presser lifting device

Provided as standard

23

Motor

2P 550W (In case of 7,000 rpm)

2P 400W (in case of less than 7,000 rpm)

*JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No. : MML018900CA (900 m g )

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From the Library of Superior Sewing Machine & Supply LLC

(2) MO-6900S SERIES

No.

Item

Specifications

1

Model

MD-69045

M0-6914$

MQ-69168

2

Description

1-needle Over1ock

2-neeclle Over1ock

2-needfe Safety stitch

machine

machine

machine

3

Stitch type F. S. T.

JIS E13

JIS E24

JISE13+ D12

(USA standard : 504)

(USA standard: 514)

(USA standard : 516)

4

Sewing speed

8,500rpm

8,000rpm

5

Stitch length

0.8to4mm

1.5to4mm

6

Needle gauge

-

2, 2.4, 3.2 mm

2, 3.2. 4, 4.8 mm

7

Overedging width

1.6, 3.2, 4, 4.8 mm

3.2, 4, 4.8 mm

3.2, 4, 4.8, 6.4 mm

8

Differential feed ratio

Gathering 1 : 2 (Max.1 : 4), Stretching 1 : 0.7 {Max.1 : 0.6)

9

Needle bar stroke

24.5mm

10

Needle tilt angle

20·

.. 11

Needle

ORGAN DC X 27 (Standard) (DC X 1

can be used as

weil.)

Presser lifting amount

7.0mm

6.5mm

7.0mm

12

13

Presser foot pressure

49N (5Kg)

14

Stitch adjusting method

By pushbutton

15

Upper knife

Flat knife

16

Differential feed adjustment

By lever with micro adjustment mechanism

17

Weight

28kg

18

Lubrication

Gear-type automatic lubrication

19

Lubricatina oil

" JUKI MACHINE OIL 18 (Equivalent to ISO VG 18)

20

Needle cooler

Provided as standard (Exduding some of subclass machines)

21

Needle thread heat remover

Provided as standard {Excluding some of subdass machines)

22

Micro presser lifting device

Provided as standard

23

Motor

2P 550W (In case of not less than 7,000 rpm)

2P 400W (In case of less than 7,000 rpm)

*JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No. : MML018900CA (900 m ! )

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From the Library of Superior Sewing Machine & Supply LLC

(3) MO-6900G SERIES

No.

· Item

Specifcations

1

Model

M0-6904G

M0-6914G

M0-6916G

2

Description

1-needle Overlock

2-needle Overlock

2-needle Safety stitch

machine

machine

machine

3

Stitch type F. S. T.

JIS E13

JISE24

JIS E13+ 012

(USA standard : 504)

(USA standard : 514)

(USA standard: 516)

4

Sewing speed

6,000rpm

5

Stitch length

2.5to5mm

2.5to4mm

2.5to5mm

6

Needle gauge

-

2.6mm

4.8mm

7

Overeclging width

4.8, 10mm

6.4mm

4.8,6.4mm

8

Differential feed ratio

Gathering 1: 1.75 (Max.1 : 3.8)

Gathering 1:2(Max.1 : 3.8)

Gathering 1:1.75{Max.1 :3.8)

Stretchirg 1:0.6

Stretching 1 :0.7 (Max.1 : 0.6)

Stretching 1:0.6

9

Needle bar stroke

28.8mm

10

Needle tilt angle

20·

11

Needle

ORGAN DO XS

12

Presser frfting amount

Max.Bmm

13

Presser foot pressure

49N(5Kg)

14

Stitch acfjUSting methcxJ

By pushbutton

15

Upperknife

Flat knife

16

Differential feed adjustment

By lever with micro adjustment mechanism

17

Weight

28kg

18

Lubrication

Gear-type automatic lubrication

·

-

19

Llbricating oil

* JUKI MACHINE OIL 18 (Equivalent to ISO VG 18)

·-

20

Needle cooler

Provided as standard (Excluding some of subclass machines)

21

Needle thread heal remover

Provided as standard (Excluding some of subclass machines}

22

Micro presser lifting device

Provided as standard

23

Motor

2P400W

•JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No. : MML018900CA (900 m 2 )

-3-

From the Library of Superior Sewing Machine & Supply LLC

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(4) MO-6900R SERIES

No.

Item

Specifications

1

Model

M0-6904R

M0-6914R

M0-6916R

2

Feed type

Vertical amount of top feed dog

3

Description

1-needle Overlock

2-needle Over1ock

2-needle Safety stitch

r:nachine

machine

machine

4

Stitch type F. S. T.

JIS E13

JIS E24

JISE13+D12

(USA standard : 504)

(USA standard : 514)

{USA standard : 516)

5

Sewing speed

7,000 rpm (longitudinal amount of top feed less than 6 rrm)

6,000 rpm (longitudinal amount of top feed 6 to 8.5 mm)

6

Stitch length

0.8to4mm

1.5to4mm

7

Needle gauge

-

2mm

32,4.Bmm

8

Overedaina width

3.21 4, 4.8, 5.6 mm

3.2.4nm

3.2, 4, 4.8, 6.4 mm

9

Differential feed ratio

Gathering 1 : 2 (Max.1 : 4), Stretching 1 : 0.7 (Max.1 : 0.6)

10

Needle bar stroke

24.5mm

11

Needle tilt angle

20·

12

Needle

ORGAN DC X 27 (Standard) (DC X 1 can be used as well.)

13

Presser lifting amount

7.0mm

6.5mm

5.5mm

14

Presser foot pressure

49N (5Kg)

15

Stitch adjusting method

By pushbutton

16

Upper knife

Rat knife

17

Vertica! amount of top feed dog

3.5to8.5mm

18

Lonaitudnal amountof top feed dog

1 to 7.5 mm (deoending on the ~ifications of the respective machines)

19

Top feed adjusting type

By lever

20

Differential feed adjustment

By lever with micro adjustment mechanism

21

Weight

29kg

22

Lubrication

Gear-~,pe automatic lubrication

23

Lubricating oil

* JUKJ MACHINE OIL 18 (Equivalent to ISO VG 18)

24

Needle cooler

Provided as standard (Exduding some of subclass machines)

25

Needle thread heat remover

Provided as standard (Excluding some of subclass machines)

26

Micro presser lifting device

Provided as standard

27

Motor

2P 55DW (In case of not less than 7,0CYJ rpm)

2P 400W (In case of less than 7,000 rpm)

•JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No. : MML018900CA (900 m f )

-4-

From the Library of Superior Sewing Machine & Supply LLC

(5) MO-6900J SERIES

No.

Item

. Specifications

1

Model

M0-6904J

M0-6914J

M0-6916J

2

Feed type

Vertical amount of top feed dog

3

Description

1-needle Orerlock

2-needle Overlock

2-needle Safety stitch

machine

machine

machine

4

Stitch type F. S. T.

JIS E13

JISE24

JIS E13+ 012

(USA standard: 504)

(USA standard: 514)

(USA standard : 516}

5

Sewing speed

6,000rpm

6

Stitch length

2.5to5mm

2.5to4mm

2.5to5mm

7

Needle gauge

-

2.6mm

4.8mm

8

Overedging width

4.8mm

6.4mm

4.8,6.4mm

9

Differential feed ratio

Gathering 1: 1.75 (Max.1 : 3.8)

Gathering 1 : 2 (Max.1 : 3.8)

Gathering 1: 1.75 (Max.1: 3.8)

Stretching 1 : 0.6

Stretching 1: 0.7 (Max.1 : 0.6)

Stretching 1 : 0.6

10

Needle bar stroke

28.8mm

11

Needle tilt angle

20·

12

Needle

ORGAN DOX5

13

Presser lifting amount

Max.8mm

14

Presser foot pressure

49N (5Kg)

15

Stitch acfJUsting method

By pushbutton

16

Upper knife

Square knife

17

Vertical amount of top feed doa

3.5to8.5mm

18

Longitudinal amount of top feed dog

2.7 to 7.0 mm (depending on the specifications of the respective machines)

19

Top feed adjusting type

By lever

20

Differential feed adjustment

By lever with micro adjustment mechanism

21

Weight

29kg

22

Lubrication

Gear-type automatic lubrication

23

Lubricating oil

*JUKI MACHINE OIL 18 (Equivalent to

ISO VG

18}

24

Needle cooler

Provided as standard (Exduding some of subclass machines)

25

Needle thread heat remover

Provided as standard (Excluding some of subclass machines)

26

Micro presser lifting device

Provided as standard

27

Motor

2P400W

*JUKI MACHINE OIL 18 (Equivalent to ISO VG 18) Part No. : MML018900CA (900 m £ )

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From the Library of Superior Sewing Machine & Supply LLC

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2. MODEL NUMBERING SYSTEM

MO-6000 SERIES MODEL NUMBERING SYSTEM

1

2

3

4

5

6

7

8

9

10

11

12

13 14 15

16

17

18

19 20

21

22

M06666DDD6666/D666-DO6

4 Machine code

7 ·6700 series

9 6900 series

7 Basic specification code

	s	Standard
*	G		Extra heavy-weight materials
*	A	Variable top feed type
,I	J		Variable top feed type for
			extra heavy-weight materials
	* 6900only

5. 6 Seam code

	03	Splicing
	04	1-needle 3-threa~ overtock (504)
	05	For blind hemmong (505)
	12	2-neeclle 4-thread mock safety stitch (512)
	14	2-needle 4-thread overtock (514)
	16	2-needle S.thread safety stitch (516)
	43	3-needle 6-thread safety stitch
	45	2-needle double chainstitch

8 Needle gauge code

0 1-needle

B2.0mm

C2.4mm,

26 mm (for extra- heavy-weight materials)

D		32mm
E		4.0mm
F		4.8mm
1		4.8 mm+ 2.0 mm

9 Overedging width code

1O Feed dog code

11 Material code

A

1.6mm

4

2-row

Classification based on materials to be used

D

3.2mm

5

1-row

1

Extra light-weight to light-

For light-weight materials such as

E

4.0mm

6

3-row

weight materials

shirts or the Uke

F

4.8mm

7

4-row

2

Light-weight to medium-

Knit wear only

-----3

H

6.4mm

weight materials

General fabrics

M

10.0mm

4

Medium-weight to heavy-

Knit wear only such as sweater or

-5

weight materials

the fike

N

18.0mm

Medium·weightto heavy-weight

------

materials such as denim or the like

For heavy-weight materials

6

7

Heavy-weight to extra

Heavy-weight materials for jeans, car

heavy-weight materials

mattress, etc.

12 Application code

Classification based on type of operation

and process

0 Standard

1For blind stitching

2Forgathering

4For attaching tape

5For binding

6For binding tape

DSplicing•

ECar mattress

FSoft chain

•In case of the splicing, 13th figure is (1).

- 6 -

From the Library of Superior Sewing Machine & Supply LLC

13 Special machine code

Special classification of machine, structure and specification other than gauge set

0 Standard

6Feed dog provided w~h a lip

7Upper looper high throw type

F For swim suits

H Upper looper extra high throw type

M For zipper

1 For splicing

15 to 18 Device and attachment code

	G0'2/O141	Presser fo(?Vtape guide for attaching tape
	G39/Q141	Presser foot (for sharp curve)/tape guide for
		attaching tape
	L121	Blind hemming ruler
	S159	Swing type ruffler (pedal-intertocking type for safety
		stitch}
	S161	Swing type ruffler (Manual lever type for safety
		stitch)
	S162	Swing type ruffler (Manual lever type for over1ock)
	N077	Four-fold binder

20 Machine head code

AStandard machine head (Common to all specifications)

21 Accessory code

A	Fa general export *
B	ForJE
G	For China

22 Machine head code

0Fully-sunken type

Semi-sunken type

The numberings after-..!'(hyphen) of 19th figure will be used on

and after Apnl 1, 2002. They are not described on the catalogue or the fike.

• The general export s~ification is for Hong Kong, U.SA, Japan and Singapore.

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From the Library of Superior Sewing Machine & Supply LLC

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3. STANDARD ADJUSTMENT

Standard Adjustment

(1) Adjusting the needle height

When the needle(s) is in the highest position,

the needle height from the throat plate surface should be as shown below.

(Unit: mm)

6~046

-

Model

1-needle/

2-needle : right

··

2-needle : left

30 -

MO6l!.04S(R) -l!.66

·l!..60

10.5

-

11 z,z 1 ,inJ,a

-Lib.6

SD

~

:I

MO6604S

-D.D.D.

·66H

11.3

-

Cl)

:II,"

Cl)

~

n

::i.,

CD

SOM

g: R

~

66146

MO- 6/\05S

-606

-66.H

11.3

-

fl)

507

11 :0

9.4

::,

MO- 6.6.125

-D.D.D.

SOF

3 Cl)

Cl)

e:

.,[!~zzma

I»

MOSD.12S

-CE4

-40H

11.3

9.9

n

a,

0

MO· 6614S (R) -B66 -

0H

2:o

MOSb14S (R) -8~6

-3c7

10.5

9.1

:,

<

CD

Cl>

2

11.3

9.9

0

::i.

40H

':,t:

66166

MO- 6b16S(R)-D.D.b

-.t.60

10.5

-

n

en

MO- Sil16S(R)-b.66

-l!..6H

11.3

-

3 e.

II>

a,

MO- 6Li16S(R)-A.6.L'l

-60H

13

-

g.~

-· en

MO6943R

-6.D.6

-b.l::,7

10.5

9.9

i~

MO66.43S

-61::J.{:j,

·6.D.H

11.3

9.9 . -

::r

C2'Z2222Z]n

MO- 6/\45S

-D.b.l:l

-360

9.8

-

:i5:

MO· 6903G

-ON6

-3D1

15.4

-

0

MO· 6904GCJl-OF6

-700

14.4

-

0,

CD

MO6905G

·OM6

-760

15.4

-

0

p

MO- 6914G(Jl-CH6

-700

14.1

12.6

<-

MO- 6916G(J)-F.0.6

-700

14.1

-

The adjustment of needle height for the 2-needle overlock machine should be made in reference to the left needle.

(2) Positioning the throat plate

The needle entry point should be such that the distances listed below are provided between the needle slot edge of the throat plate and the center of needle.

Over1ock side A	1.3
		(Unit: mm)
Double·chainstitchside B	1.0

	Note that "A:=1.8" and "8=1.5"'	A
	for M0-6~16S (R) -n6.6-60H,
	"A=1.6" and "8=1.3" for M0-69~6G, J

-8-

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures	Results of Improper Adiustment
1) Take off the upper cover, loosen setscrew 8. of needle driving	o Any other needle height than
forked crank O and move needle driving forked crank O up or	specified here will badly affect
down to adjust the needle height.	the action of the lower looper.
	the timing for.catching the upper
	looper thread, etc.

(Caution) Do not fully loosen the setscrew 8 of the needle	o	Improper lateral position of the
driving forked crank 0.		needle driving forked crank will
If the needle driving forked crank has got out of position		cause seizure, play, or other
laterally when its setscrew was loosened, fully loosen the		troubles.
setscrew and turn pulley to allow the forked crank to tum
until it settles by itself. Then tighten the setscrew to fix the
forked crank at that position.
1} Loosen setscrews 8 of throat plate base O and move throat	o	Improperly positioned throat
plate base 8 back and forth to adjust dimension A or B.		plate will	cause	needle
		breakage,	contact	of the
		needles will the throat plate, or

other troubles.

-9-

From the Library of Superior Sewing Machine & Supply LLC

,11

!I

:-1

;ii

II

I

1l

Ii

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Standard Adjustment

(3) Installing position of the needle clamp

Needle clamp connecting stud O should fit with the bottom end of needle bar 8 or spaced within oto

0.5mm.

Oto 0.5 mm

Butt the needle clamp with the	0
bottom end of the needle bar.

(4) Adjusting the length of the lower looper holder (Applicable only to M0-6~16S / M0-6916R, G, J series)

The center-to-center distance should be 26 mm.

At this time, the clearance between the end surface of the arm and the neck of the ball should be

3.5mm.

26mm

-10 -

From the Library of Superior Sewing Machine & Supply LLC

	Adjustment Procedures	Results of Improper Adjustment
	1) Loosen setscrew O and adjust, by slightly turning needle clamp	o If the clearance provided
	8. the clearance provided between the right-hand side needle	betw~en the needle and the
	and the lower looper (for 2-needle overlock machine) and the	looper is excessive, the needle
	clearance provided between the needle hole in the throat plate	thread will be likely to skip at the
	and the needle (for safety stitch machine).	time of tucking.
		o If the clearance provided
		between the needle and the
		looper is insufficient, the needle
		will break or the looper blade
		point will be damaged causing
		thread breakage.

1)Loosen setscrew O of the lower looper holder from the rear of the frame.

Since it is difficult to accurately measure the center-to-center distance. perform adjustment to provide a 3.5 mm distance between the end surface of the arm and the neck of the ball as illustrated.

oIncreasing the center-to-center distance will give a smaller stroke of the duble chain looper or lower looper, and decreasing the distance will give larger stroke.

II ll

·I'

I

I

I

I

·1

I

-11 -

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(5) Adjusting the lower looper

1) Returning amount of the lower looper

The distance between the blade point of the lower looper and the center of the needle should be as follows when the lower looper is at the extreme left of its stroke.

(Unit: mm)

Model

Dimension8

6604S{R)

OAS

156

-

4.0

.:.::

MO- SD.OSS

·OA4to OE4

·210

8

006

3t).~

~ (D

OF4

3t).O

>

C:

MO· 6604S{R)-

o:c

OF6

3.7

Cl>

u

500

-

"'

OH4

SOM

ie

Cl>

c;=

0D4 toOE4

.

46H

MO- 6604S •

OF6

3.8

50H

8

B04 to BE4

-3lH

3.8

MO- 6'°'14 S(R) • B06 to BES

.:.::

ii

(D

>

C

MO- 6614S(R) - 806 to BFS

20H

o·-

..92

'g

BE7

4uH

3.8

je

MO66125

-CE4

·40H

4.0

C

(\I

MO- 6612S

·DF6

50F

507

2.2

MO· 6616S(A) -66.0.

360

500

3.7

~

~ <D

BE4

. :

C

.

46.H

~~

MO- 6.t).16S(R)

-00/.\

3.8

-e

F66

56H

QI

"'

t8

MO·

6616S(R)

·F66

-60H

2.8

MO6943R

-666

-6.67

3.8

MO6643S

-6.6.6

-.ti.6.H

3.8

,.

MO6903G

-ON6

-301

1.4

MO6904G(J)

·OF6

-700

3.5

•

C,

Og

MO6905G

-OM6

-760

1.3

:E a,

..

MO- 6914G(J)

-CHS

-700

3.3

U)

MO6916G(J)

-F66

-700

3.5

2) Clearance between the lower looper and the needle

The clearance should be Oto 0. 1 mm.

0to0.1 mm

J

- 12 -

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures	Results of Improper Adjustment
1) Returning amount of the lower looper	o	Excessive return of the lower
CD Loosen setscrew • of lower looper support arm 8 and adjust		looper tends to cause·stitch
lower looper 8 to make adjustment of the returning amount.		skipping when filament thread is
(Referential information)		used.
1. Radius 8 of lower looper 8 will be 66.9 mm when the lower	o	Insufficient return of the lower
looper is inserted into lower looper support arm O until it		looper tends to cause needle
contacts with stopper pin O and then is fixed.		thread stitch skipping when
2. The rocking angle of the lower looper will be 2s·.		spun thread is used.

(M0-66665, R)

The rocking angle of the lower looper will be 32·.

(M0-6966G, J)

2) Clearance between the lower looper and the needle	o	Excessive clearance will often
MO-6700S Series		cause needle thread stitch
CD Loosen setscrew 8 of lower looper support arm O to the extent
		skipping.
that it is temporarily tightened. Now, make the adjustment by	o	Insufficient clearance will cause
moving lower looper support arm 8 back and forth.		needle breakage due to the
MO-6900S, R, G, J Series.		contact of the looper with the
CD Loosen setscrew 8 of lower looper support arm 8 to the extent		needle, or produce scratches on
that it is temporarily tightened. Then finely adjust the longitudinal		the blade point of the looper.
position of the looper using fine adjustment screw O.		leading to needle thread
® Turn fine adjustment screw 8 clockwise to move lower looper		breakage or other troubles.
G away from the needle.
Tum the screw counterclockwise to move lower looper 8 closer
to it.

-13-

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(6) Position of the upper looper g~ide

Vertical position :

To be in close contact with the frame guide surface. Laternal position :

To be pressed against the upper looper guide support gauge 8.

0

Frame guide surface

(Unit: mm)

									(Unit: mm)
			&St					5.8~7
Upper
looper
			13131909					13132006
guide
support			11
gauge								~
			11545100					12375606

(Unit: mm)

Model

Dimension Ci)

Modef

Dimension(B

Q)

OAS

15A

a-i

c::

360

3

£

MO·S.604S(R) -OA4 lo OE4

-210

MO- 6.6.16S{R)

-6.Ab.

500

E@

co

6.605S

E

006

3.6A

a,

~

C

:E

8

OF4

360

0

BE4

46H

~y

'C

MO- 66.04S(A)-OF6

-500

~-3

co

MO· 6/\16S(R)

-00.6.

~

E

-

OH4

SOM

..c:;

F.6..6.

SOH

a,

004 to0E4

4AH

@~

g

'g

~

MO· 6A16S{R)

-F.6.6

-60H

r,s.s

M0-6.l!:.045

·OF6

a,

?:-

[iliJ

~

50H

.S!

co

BD4toBE4

[f]

-3.6.7

Cl)

MO. 6943R

-61.).A

-D.D.7

0

MO·6614S(R)·sosto BEG

~

a,

C

:c

!...;6

t'G

,~

MQ.

S(R}-806 to BF6

0

MO· 6.6.43S

.,6_1.),,6,

-6D.H

i

E

6614

20H

~

BE7

4.llH

'C

8

a,

MO-

6612S

-CE4

-40H

>

~7

MO. 6903G

-ON6

-301

[iJ

=o

0

Q)

a,

ffil

Q)

0 507

MO- 6904G(J) -OF6

-700

C

~~~

"'

MO· 6.6.12S

·DF6

SOF

""')

cj

MO• 6905G

-OM6

-1.6.0

ff:

0

6

0

CJ)

CD

::E

MO· 6914G(J)

-CHS

-700

u~

MO6916G(J)

-f66

-700

u~

-14-

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures

1)Fit upper looper guide support gauge 8 over gauge fixing pin

0 which has been driven in frame 8 and secure the gauge with an O ring.

Then position the gauge taking the marker dot engraved on it or the chamfering direction as reference.

2)When installin upper looper guide support 8 1 press it against the gauge while keeping the upper looper guide support into close contact with the frame guide surface, then tighten the screws.

(Caution) Refer to "4- (4) -1) - (J) Various sealants" for the

various sealants.

Results of Improper Adjustment

oIf the upper looper guide has improperly positioned vertically, it will cause oil leakage or disturbed path of the upper looper with resultant stitch skipping.

oIf the upper looper guide has been inaccurately positioned laterally. it will cause stitch skipping, or contact with the looper.

-15-

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(7) Positioning the upper looper holder

The distance between the bottom surface of the frame and the upper end of the upper looper holder pin 8 should be as shown below when the upper looper holder O is at the highest point of its stroke.

53mm t

0

l llt(tllfl(llltltl((l/1

Bottom surface of frame

•

(Unit: mm)

Model

Dimension&

-~

OAS

156

45.0

MOSLl.04S(R)

-OA4 to OE4

·210

6Ll.05S

006

3All.

1

OF4

3ll.O

--

8

462

'C

MO- M04S(A)· OF6

-500

CS)

{:;

OH4

SOM

~

m

004 toOE4

46H

482

J

MO- 6.!i.04S •

OF6

50H

CS)

B04 loBE4

~

MO· 6614S(R)·

·3ll.7

47.3

u

B06toBE6

~BO~ to BFLi. 20H

.g

MO· 6614S(R)· BE7

• 4.ll.H

48.4

~

a,

MO-

6.ll.125

-CE4

·40H

>

46.8

0

Cl>

=a

G)

-507

Cl>

MO-

6ll.12S

-DFG

46.9

~

(\I

SOF

MO-

66.16S(R)-6/\l\

3l:.O

46.2

500

GI

BE4

C

4.ll.H

:c

MO-

6Ll.16S(R)- 006

48.2

u

5Ll.H

as

E

Fll.D.

.c

6616S{R) ·FD.6

.B

MO-

-60H

4B.4

",ID

en

2:-

.S!

MO-

6943R

-D.bD.

·6.D.7

47.3

a,

(/)

. -

MO-

6643S

-D.66

-6.ti.H

48.4

-

MO-

-ON6

-301

6903G

512

Cl>

-~

MO-

6904G(J)-OF6

-700

50.7

GI

Ill

-,_

(!J

MO-

6905G

-OM6

·1/:J.O

0

51.7

0

en

C0

6

MO-

6914G(J)-CH6

-700

:E

49.3

,-.

MO-

6916G(J)·FD.6

-700

48.B

-16-

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures	Results of Improper Adjustment
1) Loosen the setscrew of upper looper ball arm O and setscrew	o Inaccurately positioned upper
0 of the upper looper holder.	looper	holder will cause
2) Adjust the clearances between upper looper bracket 8 and	excessive projection of the
upper looper holder Oto approximately 0.2 mm respectively,	upper looper, resulting in stitch
and tighten setscrew O of the upper looper holder.	skipping, or other troubles.
(Make sure that the upper looper holder smoothly moves	(Caution) To adiust the upper
together with upper looper shaft O.)
	looper	ball arm, take
3) Then determine dimension O from the bottom surface of the
	dimension O as standard.
frame to the top surface of upper looper holder pin 8 before
	Remember that the projecting
tightening the setscrew of upper looper ball arm 8.
	amount and the height of the
(Caution) Replace upper looper holder 8 according to the
	upper	looper	should
needle gauge size.	eventually be		properly
	adjusted. So, confirm the
	dimensions related to the
	upper looper.

-17-

l'I

:1

!I

II

I

l'

11

I

From the Library of Superior Sewing Machine & Supply LLC

I

II;.

~'

F

II

I

I

I

I!

ii

II

i

j

I

j

II

'1·ii

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t

l

Standard Adjustment

(8)Positioning the upper looper

1)Height of the upper looper

The distance between the throat plate surface and the blade point of the looper should be as follows when the upper looper is at the extreme left of its travel.

{Unit: mm)

Model

Dimension

Ci)

"g

MO-

660

6804S(R)-L\L\L\

-6.66

"im

11.0

is

SOM

a>

ti

MO-

6604S

-L\l::.l::.

-l::.l::.H

11.3

'g~

Q)

:r

MO-

6/\05S

-!:l.66

-6illi

11.3

MO-

B04 to8E4

10.3

~

Bli145lR)·sosto BES

·307

u

0

BO6 to BF.6. 20H

"C

11.0

Q)

11)

MO6614S(R)- E

l> ~

8 7

4!::.H

Q)

u

-

co

MO-

6612S

-CE4

-40H

alE

11.B

Q)

C

"'

MO-

6L\12S

-DF6

507

11.0

--

50F

Cl>

MO-

6616S(R)

-666

-L\60

11.0

C

:E

BE4

4/\H

u

MO-

~16S(A) - D06

11.3

t'O

5~H

E

F6A

.c

j:1

MO·

6616S(R) -Fb.6

-60H

12.8

--C/l=

~~

MO-

6943R

-/\~6

·L\L\7

10.3

tU

Cl)

MO-

6643S

·L\L\6

·L\L\H

11.0

0

MO-

6903G

-ON6

-3D1

13.6

c:J

·c:

MO-

CD

6904G{J)

-OF6

•700

13.7

VJ

~

0

MO·

6905G

-OM6

·760

12.0

0

0

O>

2) Longitudinal position of the upper looper

co

MO·

6914G(J)

-CHS

-700

12.9

6

G) The clearance between the upper

~

MO-

6916G(J}

-FL\6

-700

13.7

and lower loopers should be 0.1 to 0.2 mm

when they cross with each other.

®The clearance between the upper looper 8 and the needle should be oto 0.2 mm.

0.1 to 0.2mm ~--- l

7 __:s:

Lower looper

•

-18-

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures	Results of Improper Adjustment
1) Height of the upper looper	o	If the upper looper has been
CD Set a hexagon screwdriver onto setscrew 8 at the end of upper		positioned too high, an
looper bracket O to adjust height f).		excessive clearance will be
@ When adjusting the height, pay attention also to the clearance		produced between the upper
produced between the upper looper and the lower looper at		looper and the needle. As the
the time of their crossing.		result, the upper looper thread
		will fail to catch the needle
		thread, and stitch skipping
		occurs.
	o	On the contrary, if the upper
		looper has been positioned too
		low, the needle point will hit the
		looper, causing needle
		breakage. Also the looper will
		touch other component when
		the presser foot goes up.

...... ··

2) Longitudinal position of the upper looper	o Excessive clearance will cause
CD Loosen setscrew 8 at the top end of upper looper bracket O	stitch skipping.
to move upper looper O back or forth for positioning the	o Insufficient clearance will cause
clearance of 0.1 to 0.2 mm between the upper looper and the	.the upper looper to come in
lower looper at the time of their. crossing or the clearance of O	contact with the lower looper.
to 0.2 mm between upper looper O and the needle.

-19-

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(9) Adjusting the double chain looper

(Applicable only to M0-6.616S/6916R, G, J series)

1) Returning amount of the double chain looper

The distance between the needle center and the blade point of the double chain looper should be 1.5 to 2 mm when the_ looper is at the extreme left of its travel.

M0-691 SG, J series

M0-661651 R series

•

(63.4mm)

2) Longitudinal motion (Avoid motion)

The standard minor axis of the elliptical motion should be :

3.0 mm (M0-6~16S, R).

3.5 mm (M0-691 BG, J).

Note : The avoid motion should be adjusted in accordance with Needle No.

__,.,---------\

Marller (\. I

l-~ ~j

Marker Hole 8

3) Clearance between the double chain looper and the needle

The clearance should be 0.05 to 0.1 mm.

o.os to o.1 mm

-20-

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures	Results of Improper Adjustment
1) Returning amount of the double chain looper	o	Excessive return of the double
(D Loosen setscrew 8 of double chain lopper driving arm O to		chain looper will cause frequent
make this adjustment.		stitch skipping when filament
@ Radius (I of the double chain looper driving arm 8 will be		thread is used.
63.4 mm when it is lowered until it comes in contact with stopper	o	Insufficient return of the double
pint,.		chain looper will cause frequent
@ For M0-6916G,J type machines, radius® will be 63.2 mm.		thread stitch skipping when a
© Adjust the tilt of double chain looper with setscrew 8. Adjust		spun thread is used.
the tilt to 1.6 mm.

2) Longitudinal motion (Avoid motion)			o If the avoid motion is too large,
(i) Open the cover of the adjusting hole on the rear of the frame.			triangle stitch skipping will often
loosen setscrew 0, and put a 02 rod in the hole. Now, make			occur.
the adjustment by turning the rod back and forth.
Marker: This side			Bad needle
..... Minimum (for standard to thin needle) e }		As observed	----- ~entry
.
Marker : Far side	.	from this side	Good needle
· .
..... Maxunum (for ttuck needles) C)			entry
			o Insufficient avoid motion will
			cause the needle point to hit the
			looper, producing scratches on
			the needle point or looper.

	3) Clearance between the double chain looper and the needle	o Excessive clearance will cause
	(i) Temporarily tighten setscrew fJ in the double chain looper,	frequent needle thread stitch
	and finely adjust the longitudinal position of the double chain	skipping.
	looper. Adjust the clearance to 0.05 to 0.1 mm.	'.:> Insufficient clearance will cause
	M0-6916S,R series only	to looper to hit the needle,
		leading to needle breakage or
	® Turn fine adjustment screw O clockwise to move the double
		scratches on the looper blade
	chain looper away from the needle.
		point with consequent thread
	Turn it counterclockwise to move the double chain looper closer
		breakage.
	to it.

-21 -

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(1 O) Adjusting the height and clearance of the needle guard

1) For 1-needle or 2-needle overlock machine

Make needle guard e lightly come in contact with the top end of needle (bend needle by o to 0.05 mm) when the blade point of the lower looper reaches the needle center.

The clearance between needle guard Ci) and the needle is 0.1 mm when the needle is at the lowest point of its stroke.

The height of needle guard CD is 1 mm from the throat plate bottom surface.

Needle guard Q	Needle guard @)
(Traveling needle guard)	Throat plate

1 mm

•

2) For safely stitch machine

The safely stitch machine has four needle guards, e, CD, (9 and {i). The needle guards e and 6) are positioned in the same manner as those for the overlock machine.

The needle guard Cl should be positioned 5 mm below the throat plate bottom surface.

Throat plate

==-~--===~_;r-~;=::_J_

5mm

-22 -

From the Library of Superior Sewing Machine & Supply LLC

Adjustment Procedures

1) For 1-needle or 2-needle overlock machine

CD Adjust needle guard e with setscrews O in the needle guard so that it lightly comes in contact with the needle (bend needle by Oto 0.05 mm) when the blade point of the lower looper reaches the needle center.

®To adjust the clearance provided between needle guard CD and the

needle when the needle bar is at the IONest point of its stroke, loosen setscrews 8 in the needle guard support and tum needle guard CD to adjust the clearance to 0.1 mm.

@Adjust the height of needle guard CD to 1 mm from the throat plate bottom surface w~h setscrew 8 in the needle guard.

2)For safety stitch machine

©Loosen setscrews 8 in the needle guard, and adjust the clearance provided between needle guard Ci and the needle

so that it lightly comes in contact with the needle (bend needle by oto 0.05 mm).

®Adjust the installing height of needle guard (9 to 5 mm with setscrew 8 in the needle guard.

@Adjust the clearance provided between needle guard (!) and the needle to 0.1 mm with setscrews O.

(Caution) Check again the clearance provided between needle guard CD and the needle after adjusting the height of needle guard&.

Results of Improper Adjustment

oExcessively dose contact between the needle guard e and the needles will lead to needle bend or stitch skipping.

oA clearance left between the needle guard 6'and the needles will cause the looperblade point to come in contact with the needles, leading to needle or blade point breakage, or other troubles.

oIf the needle guard CD is too high, thread loops will be damaged with resultant stitch skipping. Also, doublechain loops will be affected, causing double chain stitch skipping.

oIf the needle guard t) is too low, the needle cooling felt will be lowered, resulting in deteriorated

effect of the cooling and needle guard.

oExcessive clearance between the needleguard@)and the needJe will cause stitch skipping due to needleshake. On the contrmy, insufficient clearance will cause the needle guards to catch the needles between them, leading to wear on the needle guards and scratches on the needles.

oIf the needle guard (tis too high, the needle thread loops will be damaged, and stitch skipping occur. If it is too low, the needle points will be crushed.

oIf the clearance between the needle guard 8 and the needles is too large, the doublechain boper blade pcint will come In contact with the needles, causing the breakage of the needles, causing the breakage of the needles or looper blade point.

Noclearance left between them will cause them tooome in excessively close contact with each other, and wear on the needle guard and

scratches on the needles will occur.

oExcessive clearance left between the needle guard CD and the needles will cause stitch skipping due to needle shake, and insufficient clearance wiU cause the needle guardsto catch the needles between them, leading to wear on the needle guards and scratches on the needles.

-23-

From the Library of Superior Sewing Machine & Supply LLC

Standard Adjustment

(11) Adjusting the height of the feed dog

The height of main feed dog O from the top surface of the throat plate O should be as follows when

it is at its highest posion.

Needle A

8 entry

I

I

'

•

							(Unit: mm)
Model					Dimension A
MO-6.600S Series					-
					1.0
MO-6904G Series					1.3
MO-6914G Series						1.2
MO-6916G Series					1.1

Auxiliary feed dog 8 is 0.5 mm lower than main feed dog &.

-05mm

••

(12)Adjusting the tillt of the feed dog

Tilt of the feed dogs when the feed dogs

When the feed dog iuts out the top surface of

have come up most.

•

the throat plate

Top surface of

Feed dog is

leveled.

thethr\pla~

Front up

N\MI\

(Unit: mm)

Model

Dimension A

DimensionB

MO-6.t!:.0OS Series

1.0

(1.2)

M0-6904G Series

1.3

(1.5)

MO-6914G Series

- 1.2

(1.4)

MO-6916G Series

1.1

(1.3)

-24-

From the Library of Superior Sewing Machine & Supply LLC

	AdJustment Procedures	Results of Improper Adjustment
	1) Adjust the height of main feed dog 8 to dimension A with	o	If the feed dogs are too high, the
	setscrew 0.		needles will be deflected and
	2) Adjust the height of differential feed dog 8 with setscrew O so		broken when sewing heavy-
	that there is no difference in level between main feed dog 8		weight materials. The feed dogs
	and differential feed dog 8.		will tend to suffer scratches
	3) Adjust the height of auxiliary feed dog 8 with setscrew O so		when sewing light-weight
	that it is 0.5 mm lower than main feed dog 8.		materials. Puckering will
			frequently occur.
		o	If the feed dogs are too low,
			insufficient feed power will
			result
		o	If the auxiliary feed dog is too
			high, chain-off thread will be
			often jammed.
		o If the main feed dog and
			differential feed dog are set at
			different heights, proper
			differential feeding action will be
			hindered.

1)Use the tilt of the feed dog when it is in its highest position as a reference and adjust so that the feed dog is flush with the throat plate when the feed dog juts out the throat plate.

2)Feed bar shaft O consists of an eccentric shaft. Loosen setscrew t) to perform adjustment.

When the marker line is set at middle

.....The feed dog will be flat.

When the marker line is set at bottom

.....The feed dog will be tilted with its front up (in the arrowed direction).

When the marker line is set at top

.....The feed dog will be tilted with its front down.

(Caution) The marker line should be used just as the reference since it slightly differs with that of each machine due to the disparity of the components.

Confirm the accurate tilt of the feed dog by observing the

feed dog itself.

cWhen tilted with the front up Good material catching will be obtained.

oWhen tilted with the front down Uneven feed and puckering will be effectively prevented.

-25-

From the Library of Superior Sewing Machine & Supply LLC