Brother DB2-8773, DB2-8774, DB2-87740 Service Manual

5 (1)

CONTENTS

INAMES OF MAIN PARTS I·..

 

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1

ISPECIFICATIONSI ......

.....

 

..

 

..

 

..

 

..

 

 

 

..

...

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

 

..

 

..

 

.

 

 

 

3

IMECHANICAL DESCRIPTIONS I·.........................................

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

rn Upper shaft and needle bar mechanism

 

0

0

0

0 .

0

0

0

0

0 .

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

5

[2} Lower shaft and rotary hook mechanism

 

. o o

••

0

0

o

o

0

0

0

0

0

0

0

 

0

o

••

0

0

 

5

IJJ

Upper feed mechanism

 

. 0

0

0 .

0

0 . 0

0

••

0

0 .

0

0 . 0 . 0 . 0

0

0

0

0

0 . 0

0 . 0

0

 

0

0

0

0 . 0

 

6

1!1 Feed mechanism

.. 0

••

0

0

0

0

0

0

0

0

••

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

 

7

~ Feed adjusting mechanism and quick reverse mechanism

 

0

0

0

0

0

0

0

0

0

 

8

[§]Upper feed mechanism and shirring mechanism (subclass -006)

 

0

0

0

0

 

9

[l]Threadtrimmer

00000 oooooooooooo ••• o •• o . o . o . o . ooooooooooooooooo

10

liD Tension release

... 0

••

0

0

0

• 0

0

•• 0

0

0 • 0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

0

13

~Thread wiper (subclasses -400, -900)

 

0

0

0

0 0 0 . 0

0 0 . 0 0 0

0

0

0

0

0

0

 

0

0

0

0 . 0

0

13

1m Automatic presser bar lifter mechanism (subclass -900)

 

 

0

0 . 0

0

 

0

0

0

0

0

0

0

14

lllJ

Lubrication me~hanism

 

. 0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

0

15

IDISASSEMBLY ,. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . .. . .. . . . . .

17

[I]Machinecovers

·o···ooooooooo··o•oooooo•o•o•ooo·ooooooooooooooo

17

lZJ

Presser foot mechanism

 

 

0

0

0

0

0

0

0

0

••

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

18

[ID

Upper feed mechanism

 

. 0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

•• 0

0

0

0

0

 

0

0

0

0

0

0

0

18

1!1 Rotary hook mechanism

 

0

0

0 0

0

0

0

0

0

• 0

0

0

0

0

0

• 0

0 • 0

0 • 0 0

0

0

0

0 0

0 0

0

0

0

19

f.SlThreadtrimmer

... ooooooooooooooooooooooooooooo•ooooooooooooooo

19

[§] Feed mechanism

0

0

0

0

0

0

0

0

0

0

0

0

0

••••

0

0

0

0

0

0

••••

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

20

[1]

Needle bar mechanism

 

. 0 .

0

0

0

0

0

0

0

0

0 .

0

0 .

0 . 0 . 0

••

0

••••• 0

0

0

0

0

 

0

0

0

0

0

0

0

21

IASSEMBLY I............

....

 

..

 

..

 

..

 

..

 

 

 

..

...

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

..

 

 

..

 

..

 

..

 

 

 

22

[] Needle bar mechanism

 

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

••

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

22

lZJ

Feed mechanism

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

~

23

[ID Thread trimmer

. 0

0

0

0

0

0

0

0

0

0

·0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

25

1!1 Rotary hook mechanism

 

. 0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

27

~ Presser foot mechanism

 

 

0

0

0

0

0

0

••

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

••

0

0

0

28

rnJ

Upper feed mechanism

 

0

0

0 .

0

0

0

0

0 . 0 . 0 .

0

0 .

0

0

0 .

0

0 .

0

0

0

0

0

0

0 . 0 . 0

0

0

0

0

0

0

29

[1]

Machine covers

0 0 0 0 0 0 0

0

0

0

0

0

0

0

0

0

0

••

0

0

• 0 • 0 0

• 0

0

• 0 0 •• 0

• 0

0

••

0

 

0

0

0

0

0

30

'ADJUSTMENT , ........................................................

31

[I] Adjusting the timing between needle and rotary hook

 

0

0

0

o

o

0

o

o

o

o

o

0

31

[l] Adjusting the timing between needle and feed

 

0 . 0 0 .

0

0

0

0

0

0 . 0

0 .

0

0

0

0

32

[ID Adjusting the fofward and backward stitch lengths

 

0

0

0

0

0

0

0 .

0

0 .

0

0

0 .

33

1!1 Zeroing feed regulator and adjusting reverse lever

 

0 .

0 . 0

0 .

0

0

0

0 .

0

0

0

0

34

~Adjusting the timing of upper feed horizontal movement

 

0

0

 

0

0 . 0

0

0

0

35

rnJ Adjusting the timing of the upper feed vertical movement

 

0

0

 

0

0

0

0

0

0

0

36

I1J Adjusting presser foot

 

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

0

0

0

0

0

0

0

37

From the library of: Superior Sewing Machine & Supply LLC

liD Adjusting thread trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

38

liD Adjusting tension release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

39

IDl Adjusting thread tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40

lll1 Adjusting synchronizer {082-8774) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41

1121 Adjusting thread wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

42

1131 Adjusting potentio-meter (87740) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

43

1m Checking feed mechanism weight (87740) . . . . . . . . . . . . . . . . . . . . . . . .

44

ll51 Adjusting sensor position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45

Ill Adjusting the indication of the distance between needle hole and

 

sensor (87740) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

46

IREPLACEMENTS I.......................................................

47

li1 Replacing Solenoids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

47

l1l Replacing tension release wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50

~ Replacing bobbin tension spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50

~Replacing photo-cell and reflector {87740) . . . . . . . . . . . . . . . . . . . . . . .

51

[SJ Replacing Synchronizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

53

IOPTIONAL EQUIPMENT!................................................

54

li1 Thread wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

54

l2l Presser foot lifting solenoid set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55

ITROUBLESHOOTING GUIDE I............................................ 59

From the library of: Superior Sewing Machine & Supply LLC

 

SPECIFICATIONS

I

..,

 

 

 

 

 

 

 

 

 

 

 

 

 

BROTHER INDUSTRIES, LTD.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

082-8773-poq

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MADE IN JAPAN

 

.J

 

 

 

""

 

 

 

 

 

 

 

 

 

 

when the upper feed amount is 6 mm or

more, or When the lower feed amount is 4 mm or more, use a sewing speed less than 3500 spm.

Use a maximum feed amount of less than 6 mm when a pucker type gauge (assembly A) or pucker-control gauge (assembly C) 1s used on model 082-8772-006.

 

 

ODD

-003

 

 

-006

 

 

 

 

 

 

 

 

 

 

 

Use

 

Medium material

 

Gathering

 

 

 

 

 

 

 

 

 

 

 

 

Sewing speed

 

4,500 spm

 

 

 

 

 

 

 

 

 

 

 

Maximum Stitch length

 

Smm

 

 

 

 

 

 

 

 

 

 

 

Maximum upper feed amount

 

6mm

 

Bmm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Presser

Presser bar lifter

 

6mm

 

 

foot

 

 

 

 

 

 

 

 

 

height

Knee lifter

 

13mm

 

 

 

 

 

 

 

 

 

 

Feed dog height

 

O.Bmm

 

 

 

 

 

 

 

 

 

Needle DBx 1

#11

 

 

 

 

 

 

 

 

 

 

Gauge

 

AssemblyS

 

Assembly B

 

 

 

 

 

 

 

 

 

Shirring device

-----------

 

 

Included

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The specifications of 082-8774 with automatic thread trimmer are shown below.

BROTHER INDUSTRIES, LTD.

 

082-8774-···

 

 

 

 

 

 

 

L--..J

 

 

 

 

 

 

MADE IN JAPAN

I

 

 

.J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

==------.!

 

-30

 

-40

 

-90

 

 

 

 

 

 

 

 

 

 

 

 

Thread trimmer

0

 

0

 

0

Thread wiper

~

0

 

0

Quick back

0

 

0

 

0

 

 

 

/

 

/

 

 

Automatic presser

 

 

0

bar lifter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ply sensor

 

 

 

Option

 

 

 

 

 

Control panel

 

E20, E40, E100 (option)

 

 

 

 

 

 

 

 

---------·

4,500spm

 

 

 

I

 

 

 

 

 

 

-003

 

-006

 

 

Use

Medium material

 

Gathering

 

 

 

 

 

 

 

Sewing speed

 

 

 

 

 

 

 

 

Maximum upper feed amount

6mm

 

Bmm

 

 

 

 

 

 

 

Feed dog height

O.Bmm

 

 

 

 

 

 

 

Presser

 

Presser bar lifter

6mm

 

 

Knee lifter

13mm

 

foot

 

 

height

 

 

 

 

 

 

Automatic presser

6mm

 

 

 

 

 

 

bar lifter

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle DBX 1

#11

 

 

 

 

 

 

 

 

 

Gauge

Assembly$

 

Assembly B

 

 

 

 

 

 

When the upper feed amount is 6 mm or more, or When the lower feed amount is 4 mm or more, use a sewing speed Jess than 3500 spm.

Use a maximum feed amount of less than 6 mm when a pucker type gauge (~ssembly A) or pucker-control gauge (assembly C) is used on model DB2-B772-• 06.

When the upper feed amount is 6 mm or more, or When the lower feed amount is 4 mm or more, use a sewing speed less than 3500spm.

Use a maximum feed amount of 6 mm or less than 6 mm when a pucker type gauge (assembly A) or pucker-control gauge (assembly C) is used on model 082-8772-D 26.

 

DB2-B7740

-423 I -923

 

-426 I -926

 

Use

Medium material

 

Gathering

 

 

 

 

 

Sewing speed

4,500spm

 

 

 

 

Maximum Stitch length

Smm

 

 

 

 

 

Maximum upper feed amount

6mm

 

Bmm

 

 

 

 

Presser

Presser bar lifter

13mm

 

 

 

 

foot

Knee lifter

Minimum 10 mm

height

Automatic presser

 

 

 

 

Bmm

 

bar lifter

 

 

 

 

 

 

 

 

 

Feed dog height

O.Bmm

 

 

 

 

 

 

Needle DBx 1

 

#11

 

 

 

 

 

 

Thread trimmer

 

0

 

 

Thread wiper

 

0

 

 

Quick back

 

0

 

 

 

 

 

Automatic pr~sser bar lifter

~I 0

 

~I 0

-3-

From the library of: Superior Sewing Machine & Supply LLC

lAJ Feed mechanism

@

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

@---

 

@

 

~

1)When the machine pulley 0 rotates in the direction of the arrow, the level feed eccentric wheel @ attached to the upper shaft@ moves the level feed connecting dog 0 up and down.

2)The level feed connecting dog 0 moves the level feed arm link assembly @,swinging the feed rock shaft arm <9.

3)The feed rock shaft arm @ moves the feed rock shaft & .

4)The feed rock shaft & moves the horizontal feed bracket arm ED, moving the feed bracket @) forward and backward.

5)The eccentric wheel CID moves the vertical feed connecting rod 4D up and down.

6)The vertical feed connecting rod 4D swings the feed lifting rock shaft crank 0 attached to it.

7)The feed lifting rock shaft crank 0 moves the feed lifting rock shaft@.

8)The feed lifting rock shaft@ moves the feed lifting crank~, moving the feed bracket@) up and down.

9)The combined movement of 4) and 8) operates the feed dog @ attached to the feed bracket @).

-7-

From the library of: Superior Sewing Machine & Supply LLC

Brother DB2-8773, DB2-8774, DB2-87740 Service Manual

(§] Upper feed mechanism and shirring mechanism (subclass -006)

Upper feed amount

1)When the upper feed regulating plate assembly (left) 0 rotates, the upper feed regulator cam @ rotates, moving the shirring lever e linked with the upper feed regulator shaft@.

2)The shirring lever 9 moves the upper feed regulator arm @),moving the upper feed regulator assembly @ and the feed regulator shaft assembly e.

Rotating the upper feed regulating plate assembly (left) 0 changes the upper feed amount.

Shirring

@ attached to the shirring lever 9 is pulled in the direction of the arrow, the

1)

When the shirring wire

 

shirring lever 9 moves the upper feed regulator shaft@, the upper feed regulator arm @,the upper feed

 

regulator assembly@, and the feed regulator shaft assembly 6.

 

Rotating the upper feed regulating plate assembly (right)@) changes the shirring amount.

2)

When the shirring wire

@ is released, the spring ([.i) moves the shirring lever 9 and the upper feed

regulator arm@) to the previous positions.

-9-

From the library of: Superior Sewing Machine & Supply LLC

111 Thread trimmer

1.Thread trimmer

The thread trimmer consists of the movable knife 0, the fixed knife @,the lower thread finger @) 1 the movable knife holder e I the knife holder presser @ , the forked shaft @), the thread trimmer cam lever assembly f), the thread trimmer clutch@ , and the thread trimmer solenoid@.

2.Thread trimmer operation (The five figures below and on the next page show the thread trimmer without the rotary hook assembly.)

(1) During operation

The thread trimmer cam lever spring @ presses the thread trimmer cam lever assembly f) against the thread trimmer solenoid @. Because the thread trimmer cam lever assembly f) does not engage with the thread trimmer clutch@ I the movable knife holder e does not function.

The thread trimmer lever springiD presses the thread trimmer lever 0 to prevent the movable knife holder 9 from shifting.

(2) When the thread trimming signal is received

When the treadle is heeled back and the thread trimming signal is received, the thread trimmer solenoid @ activates, and presses the thread trimmer cam lever stud 6). The roller bearing of the thread trimmer cam lever assembly f), secured by the thread trimmer cam lever stud 6), is pushed above the circumference of the thread trimmer clutch «D.

-10-

From the library of: Superior Sewing Machine & Supply LLC

(3) Movable knife holder action

By the rotation of the lower shaft, the thread trimmer clutch @ pushes the roller bearing up. The motion of the roller bearing is transmitted to the forked shaft@ via the thread trimmer cam lever assembly f).

The motion is then relayed to the thread trimmer rod 49 and the movable knife holder 0 via the thread trimmer lever 4!1 connected to the forked shaft@.

The movable knifeO attached to the movable knife holdere moves in the direction of the arrow and overlaps the fixed knife @.

(4) Thread trimming complete stop

When the thread trimming signal is not received, the thread trimmer solenoid @ retracts and the thread trimmer cam lever spring tiD pushes the thread trimmer cam lever assembly f). Then the roller bearing of the thread trimmer cam lever assembly f) moves away from the thread trimmer clutch @ and returns to its original position.

The thread trimmer lever spring 4D returns the thread trimmer rod 49 and the movable knife holder 0 to their original positions (in the direction of the arrow).

(S) Thread trimming safety device

If the movable knife 0 does not completely retract, the pin of the thread trimmer cam lever assembly f) and the thread trimmer clutch @ automatically carry the movable knife 0 to a position where it does not strike the needle.

-11-

From the library of: Superior Sewing Machine & Supply LLC

3. Needle and bobbin threads trimming

------

(1)When the needle rises 1.8 mm above its lowest position, the rotary hook point catches the loop formed by the needle.

(2)When the thread trimming signal is received, the thread trimmer clutch drives the movable knife. The needle thread is caught by the rotary hook and fed around the shuttle body.

-----

(3)The movable knife tip enters the triangular loop formed by the rotary hook point under the needle plate, and the loop spreading occurs. At this point the thread take-up is raised slightly above its lowest position (the upper shaft has turned approximately 330°), and the needle thread is spread by the movable knife as shown in the figure above.

If the timing of the movement is too early, loop spreading is not performed properly which results in thread trimming errors.

Bobbin thread

Movable

knife

As seen with the fixed knife removed

(4)The needle and bobbin threads caught by the movable knife in step (3) are gradually spread by the movable knife and the lower thread finger to be cut by the fixed knife tip. At this time, the thread take-up approaches the top of its stroke.

When the movable knife is spreading the needle thread, the tension release relieves the needle thread tension to prevent excessive tension and to enable the needle thread to be extended smoothly.

-12-

From the library of: Superior Sewing Machine & Supply LLC

liD Tension release

1)

The thread trimmer solenoid 0 operates when the thread trimming signal is received.

2)

The solenoid lever @, attached to the end of the thread trimmer solenoid 0, pushes the tension

 

releasing lever@.

3)The tension releasing wire 0 relays the motion of the tension releasing lever @to the thread tension releasing plate@.

4)The thread tension releasing plate@ presses the tension releasing stud @.

5)The tension releasing stud@ presses up the tension release pin fj and the tension disc presser@).

6)The tension disc presser@) presses up the tension discs@).

7)When the thread trimming signal is not received, the solenoid lever@, the tension releasing lever@ and the tension releasing wire 0 return to their original positions.

(The tension releasing spring 4D> forces the tension releasing lever@ all the way back.)

NOTE: When the presser foot is raised by the knee lifter, the knee lifter lifting leverG) presses the thread tension releasing plate@. The subsequent action is the same as steps 4 through 7 above.

When the presser foot is lowered, the presser lifter lever spring 0 returns the thread tension releasing plate@ to its original position.

m:J Thread wiper (subclasses -400, -900)

0

1)When the thread wiping signal is received after thread trimming is completed, the thread wiper solenoid 0 lifts the thread wiper rod@.

2)The thread wiper rod @ drives the thread wiper crank assembly @, attached to the end of the thread wiper rod @.

3)The thread wiper 0, attached to the end of the thread wiper crank assembly @, wipes the thread.

4)When the thread wiper signal is not received,

the thread wiper spring @ returns the thread wiper solenoid 0 to its original position.

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From the library of: Superior Sewing Machine & Supply LLC

I1W Automatic presser bar lifter mechanism (subclass -900)

t

1) The presser foot lifting solenoid 0 moves the link joint @ and the presser foot lifter regulating rod @ when the knee switch is pressed.

2)The presser foot lifter regulating rod @ pushes up the knee lifter complying bar @) via the presser foot lifting link 9.

3)The knee lifter complying bar @) moves up the presser bar clamp 4ID via the knee lifter bar €) 1 the knee

lifter lever &I the knee lifter connector@) and the knee lifter lifting lever €>.

4) The presser bar 0) and the presser foot 4fl 1attached to the presser bar clamp (@I are lifted.

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From the library of: Superior Sewing Machine & Supply LLC

lD1 Lubrication mechanism

1.Upper shaft lubrication

1)Oil fed by the pump body 0 flows into the upper shaft through the upper shaft bushing (middle) @ to lubricate the upper shaft bushings (left) @ and (right) 9. The oil sprayed inside the vertical portion of the body lubricates the feed regulator.

2)Because the oil regulating valve ~ is attached at the left edge of the upper shaft, the thread take-up body is lubricated through the thread take-up crank and the needle bar crank.

3)The thread take-up lever is lubricated through the felt attached to the needle bar crank. The felt prevents oil clogging and over-lubrication.

4)The oil cap@ attached at the upper shaft'sright edge prevents oil from being shed outside the machine.

5)The oil which is collected in the portion of the body with the needle mechanism is transported to the pump body 0 via the felt and the wick.

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From the library of: Superior Sewing Machine & Supply LLC

2.Lower shaft lubrication

0

Arm channel

 

Lower shaft

 

 

 

1)

The oil fed by the pump 0 lubricates the lower shaft and the lower shaft bushing (left)@.

2)

Some of the oil at the lower shaft bushing (left) @ flows through the lower shaft to lubricate the rotary

 

hook.

 

The oil shed from the lower shaft bushing (left)@ returns to the oil pan.

3)

The oil absorbed by the wick lubricates the feed rock shaft@ and the feed lifting rock shaft e.

4)

The oil sprayed inside the vertical portion of the body lubricates the lower shaft bushing (right) 8, the

 

feed rock shaft@ and the feed lifting rock shaft e through the arm channel.

3.

Pump mechanism

By means of the rotation of the pump propeller 0 attached at the vertical shaft bottom, oil is drawn to the pump through the center hole. The oil is fed to the lubrication tubes through the ports of the pump body.

The oil collected in the portion of the body @ with the needle mechanism is drawn to the pump body by the pump plunger.

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From the library of: Superior Sewing Machine & Supply LLC

DISASSEMBLY

[]] Machine covers

1)Remove the screw 0 and the needle@.

2)Remove the three screws@), then remove the face plate e and the face plate packing@.

3)Remove the four screws@, then remove the upper cover fl and the upper cover packing@.

4)Remove the six screws@), then remove the rear cover 4ID and the rear cover packing {I).

5)Remove the screw@ and the thread take-up cover@.

6)Remove the two screws 49 and the oil stopper plate®.

7)Remove the screw(;) and the upper tension regulator assembly 49.

For a sewing machine with automatic thread trimmer:

Before removing the rear cover 4ID, remove stop ring E® ,washer@ and the connecting pin W. Remove the three screws ~ and the solenoid bracket fD.

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From the library of: Superior Sewing Machine & Supply LLC

111 Presser foot mechanism

1)Remove the regulating nut 0 and the presser regulating dial@.

2)Remove the presser spring 9 and the adjusting screw @).

3) Loosen the screw @, and rem~:>Ve the upper feed bracket assembly @) (presser foot, upper feed dog and upper feed crank).

4)Remove the the pin 6 and the spring @ .

5)Remove the screw @ and the presser bar bracket thread guide 4ID .

6)

Loosen the screw ID . Remove the presser bar clamp@ by lowering the presser bar 0 .

7)

Remove the presser bar 0 from the arm top.

llJ Upper feed mechanism

0

0

1)Loosen the screw 0 and remove connecting stud (lower)@.

2)Remove the two screws@), then remove the upper feed connecting lever 9 and the crank assembly@.

3)Loosen the screw @). By inserting the screwdriver into the notch of the upper feed rock arm (lower) &, remove the upper feed arm assembly@ and the washer@).

4)Loosen the four screws 4ID .

5)Loosen the screw (D. By inserting the screwdriver into the notch of the feed rock shaft 0, remove the

upper feed rock shaft~ and the upper feed rock arm (upper) ~.

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From the library of: Superior Sewing Machine & Supply LLC

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