Brother B830 Series User manual

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From the library of: Superior Sewing Machine & Supply LLC

CONTENTS [Model 8831 · 8832 · 8835 · 8836 · 8882]
C Page
NAMES OF MAIN PARTS)............. 1
(SPECIFICATIONS) ...................... 3
(MECHANISM)........................... 5
[]Upper shaft and needle bar mechanism . . . .. . . • 5
[!)Needle feed mechanism . . . . . . . . •. . . . . . . . . . . •. 5
[!] Lower shaft and rotary hook mechanism . . . . . . . 6
[!] Feed mechanism . . . . .•. . . .. . ••. . .. . . .. . . . . .. . 6
III Thread trimmer mechanism . . ••. . . . •. . . . . . •• . . 7
[I) Tension releaser mechanism ...............• ;. 7
[II Reverse mechanism . . . . . . . . . . •. . . . . . •. . . . . . •. 8
(!]Thread wiper . . . .. . . .. . . . . .. . . . . .. . . . .. . .. . . . 8
[!J Needle bar (left and right) mechanism types
8835 and 8836 . .. . .. .. .. .. . .... .. . . .. . .. . .. 9
@)Top feed mechanism types 883 7 and 8838 10
DISASSEMBLY PROCEDURES 11
B831,B832,B835,B836,8882
[]Cover . •. .. . . .. . . . . . .. . . . .. . . . . . .. . . . .. . . .. . . 11
[1] Presser mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . 11
[!]Thread wiper . . •. . . . .. . . . .. . . . . .. . . .. . . . .. . . • 12
[!]Rotary hook. lower shaft and
thread trimmer mechanism . •. . . . . . . . . . . . ••. . . 12
III Reverse mechanism . .. . . •. . .. . . •.. . . . . . .. . . . • 14
[!]Needle bar rocking shaft mechanism .. . . . . . . . . . 15
[II Reverse switch mechanism . . . . . . .. . . . . . . . . . • . 15
(ASSEMBLY PROCEDURES) ........... 16
[]Needle bar rocking mechanism . •. . . •. . . . . . . • . . 16
[1] Lower shaft. thread trimmer and
rotary hook mechanism . . . . . . . . . . . . . . . . . . . . . •.
16
[!] Presser mechanism . . . .. . . . •.. . . •. . . .. . . .. . . • 21
[!]Thread wiper .......••.....................•• 21
(1] Reverse switch mechanism . . . . •. .. . . .. . . .. . . . 23
[!]Reverse mechanism . . . . . . . . . •. . . . . . . . . . . . . •. . 23
[II Cover •. . .. . . .. . •. . . . .. •. . .•. . . . . .. . . . . .. . . . . 24
STANDARD ADJUSTMENTS ..... 25
B831,B832,B835,B836,B882
lil Needle and feed t1mmg (8831) . . . .. . . . . . . . . . . . 25
(1] Adjustment of needle bar to presser bar gap
(Models 8831. 8832. 8835. 8836. 8882) . . . . . 28
[!]Needle and rotary hook timing adjustment •. . . . . 29
[!] Rotary hook to needle plate gap . •. . . . . .. . . . . . . 31
II] Rotary hook to bobbin case opener gap . ••. . .. . 31
[!]Presser foot height adjustment . . . .. •.. . . ••. . . . 32
[II Feed dog height adjustment .. .. . . ••. • .. . . . . .. 33
(!]Tension release adjustment . •. . •. . . .. . ••. . . . . . 34
[!]Stitch length adjustment . . . . . . .. . ••. . . . . . . . . •. 35
(!ID Reverse feed soleno1d adjustment . .. . . . . . . . . . . 36
[illThread wiper adjustment . . . .. . . . . . .. . . . . . . . . . 37
lliJ Slider adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
[!!]Movable and fixed kn1fe adjustment . . . . . . . . . . . . 40
IE) Knife mam lever roller . . .. . .. . .•. . .. . . . . . . . . . . 42
ffi) Knife drcving lever adjuStment . . . . . . . . . . . . . . . . . 42
@] Position detector adjustment . . . . . . .. . . .. . . . . . . 43
ill) Corner sewmg pos1t10n adjustment
(8835. 8836) .. . .. .. . .. . ...... .. .. . .. . ...... 43
[!!] Timmg belt replacement •. . . . .. . . . . .. . . . . . . . . . 47
\/
From the library of: Superior Sewing Machine & Supply LLC

CONTENTS [Model 8837 · 8838]
DISASSEMBLY PROCEDURES
B837,B838
Page
...... 48
[I) Cover . . . . . . . .. . •. . •. ••. . .. . . .. . . . . . . . . .. . . .. 48
[!]Tension release lever . . .. .. . .. . . . . . . . . . .. .. . . . 49
[II Presser foot and walking bar . . . . .. . •. •. .. . . . . . 49
fl] Needle bar and needle thread take-up . . .. . . . . . 51
[I] Feed assembly . . .. . . .. . . •• .. . . .... . . .. . . . .... 51
(ASSEMBLY PROCEDURES) ........... 52
[I) Feed assembly . .. . . . .. .. . . .. . . •. .. . . . . .. . . . . . 52
[!]Needle bar . . . . . . . . . . •. . . . . . . . • . •. • . . •. . . . . •• 52
[II Walking bar and presser foot . . . •. . . . . . . . . . . . . 53
fl]Tension release lever ......................... 57
[!]Cover .•...•....•..•...•.•..•••.............. 58
STANDARD ADJUSTMENTS .. .. .... 59
B837,B838
[I) Needle and feed timing adjustment (standard) . . 59
[!]Feed dog adjustment m back and forth
directions . . .. . . . .. . . . . .. . . .. .. . . . . . . . .. . . . . .
60
[II Needle and rotary hook timmg adjustment . . . .. . 61
fl] Clearance between rotary hook and
needle plate . . • .•. . . . . •. . . . . . . . . . . . . . . . . . . . . . 62
11] Clearance between rotary hook and
bobbin.case opener . . . . .. •. . .. . . .. . . . . . . . .. . . 62
[!] Presser foot height adjustment . •. . . . •• . . . . . . . . 63
II] Feed dog height adjustment . . .. . . .. . . .•. . . . . . 64
II] Vibrating presser foot and lifting presser foot
and needle timing adjustment . .. . . . . . . •.. . . .. •
65
1IJ Upper feed adjustment .. . •• .. . . .... . .. . . . . .. . 65
[!ID Vibrating presser foot and lifting presser foot
vertical stroke adjustment . . . .. . . . . . . . . . .. . . . .. 66
GAUGE PARTS LIST FOR
DOUBLE NEEDLE LOCK STITCH
SEWING MACHINES _, ..... 67
(OTHERS)................................. 75
[I) Top cover thread guide .. • ...... • ...... .. . .. .. 75
[!]Adjusting upper thread length •. . .. . . . .. . ... . .• 75
[II Anti-spinning spring .. . .. . .. .. .. •. . .. . . . .. . .. . 76
fl]8obbin ......................•......•........ 76
ITlTo thread bobbin cases (8835. 8836) ........• 76
(TROUBLESHOOTING GUIDE) ......... 77
From the library of: Superior Sewing Machine & Supply LLC

(NAMES OF MAIN PARTS )
< M odel LT 2-B831 >
Ll2B831
- 1 3
-5
for thon
For med1um- For
th1ck
Use
matenals
th iCk
matenals
matenals
Sew1ng speed 4000 spm 3000 spm
Sutch length
0-4 mm 0-5 mm
Presser foot 7 mm
he1ght
Feed dog he1ght 1
mm
Needles DP X 5
<
Mod el LT2-B832 > LT2-B832
-1 - 3 -5
For t h1 n For med1
um-
For t h1ck
Us e matenals thi
Ck
matenals
matenals
Sew1ng speed 4000 s pm 3000 spm
Stitch length
0-4 mm
0-5 mm
Presser foot 7
mm
Presser lifter
fo ot
he1ght
Knee lifter 7 mm
f---
reed dog he1ght
1 mm
Needl
es DP x 5 DPx5 # 11 DPx5 li
14 DPx5 li22
< Model LT2-B882 >
LT2 -8882
-3 -5
Use For med1um-t
h1ck Fo r t h1ck
matenals matenals
Sew1ng speed 3000 spm
St1tch length Q-7 mm (Spec1a l orde r 8mm)
Presser foot 7
mm
Pre sser
l1fter
foot
he1ght Knee lifter 12 7 mm
Feed dog he1gh t 10 mm
Needles DP x 5
DPx 51i 14 DP X 5fj 22
_, _
From the library of: Superior Sewing Machine & Supply LLC

< Mod el LT2- B835 >
LT2 - B835
- 3 5
Use For
medtum - lh tck
ro r thtck
matenals matenals
Sewtng speed
3000 spm
S tn ch length 5 rnm
Presser foot 7 rnrn
hetght
Feed dog hetght 1.0 mm
N ee dl es DP X 5
< Mod el LT2- B836 > LT2-
B836 - 3 - 5
Us e For
med turn-thtck For thtck
matena ls matenals
Sewtng speed
3000 spm
Sutch le ngth 8 mm
Presser foot
105 mm
Presser lifter
f oo t
hetght Knee lifter 16
mm
Feed d og hetght 1.0
mm
Needles DP X 5
< Mod el LS 2-B837 > LS2-
B837
U se For th 1 ck mat ena ls
Sewmg speed 3000 spm
Max. stttch l ength
8 mm
Presser foot !Presser foot l1f ter
10 .5 mm
he1ght !
Knee lifter
16 mm
Feed dog he1ght 1.0
mm
Needle DP X 17
< Model LT2-B838 > L
T2-B838
Use For
th1 ck mater 1als
Se
w111 g speed
3000 spm
Max. Sti t Ch length
8 mm
Pr esser foot lP resser foot
l ift er 10 .5 mm
he1 gh t
IK nee l1 fter
16 mm
Feed d og he1ght 1.0
mm
N eedle
DP X 17
- 2 -
From the library of: Superior Sewing Machine & Supply LLC

<LT2-B8 32 - 400A >
< LT2-BB35-400A >
< L
S2-B837 - 300A >
-3-
M otor
B ACK TACK
POWI:R ~
START END REPEAT
ON
ON ON
@ @ @ NFEOLE
POSITION
UP
OFF OFF
OFF
r--"YI
@
OOWN
Control box assembly
SEWING SPEED
~----~
(M:
L OW HIGH
Speed c ontr ol VR
Tr ea dle unit
S E'MNG SPEED
,. .... ~
( ~ '
~
lOW HIGH
I 'Ej
From the library of: Superior Sewing Machine & Supply LLC

Ill Motor pulley
Med1um
---------------
Machine speed
Motor Pulley Size
Part No.
Belt Cover
#No.
Part No.
Treadle Unit
#No.
Part No.
Control Box v
Assembly Part No.
Thick
----------
Machine speed
Motor Pulley Size
Part No.
Belt Cover
#No.
Part No.
Treadle Unit
.#No.
Part No.
Control Box v
Assembly Part No.
LT2 -B832 -403A
703A
50 Hz
60Hz
4000 spm
1
20 Pulley
105 Pulley
224545-000
226389-000
#12-2 #1 2-1
22454 7-001
226393-001
#5-38
224396-038
110/220V
•
100/200 v
226531-001
226426-001
LT2-B832-405A
705A
50 Hz
I
60Hz
3000 spm
105 Pulley I 90 Pulley
226389-000
224506-001
#1 2-1
226393-001
#5-30
224396-030
110/220 v •
100/200 v
226531-002 226426-002
L T2 -B83 5-403A
703A
50 Hz
I
60Hz
3000 spm
105 Pulley l
90 Pulley
226389-000
224506-001
#12-1
226393-001
#5-30
224396-030
110/220 v
100/200 v
226531 -002 •
226426-002
LT2-B835-405A
705A
LS2-B837 -300A
50 Hz
I
60Hz
3000 spm
105 Pulley I
90 Pulley
226389-000
224506-001
#12-1
226393-001
#5-30
224396-030
110/220 v • 100/200 v
226531-002
226426-002
• When ordering a motor be sure to specify the sewing mach1ne model number. intended matenals to be used. and either
single or three phase.
• Parts in the above table are for both smgle and three phase machines.
• Machines and motors for voltages other than those specified above can be manufactured to order. Consult your local
dealer.
•
Be sure to refer to the parts book when ordermg any parts.
(2) Motor pulley change
-4-
* Use the V-belt included together with the machme
head. After installing the belt. loosen both hexagon
nuts
0. and adjust the tens1on of the belt. Make sure
that the correct belt tension
is mamtained. Then
tighten the hexagon nuts.
• The belt can be depressed about 10 mm w1th a f1nger.
From the library of: Superior Sewing Machine & Supply LLC

""- 1 l' J. .c, ~ J-. J-\.1 ''U,::, rn )
[I] UPPER SHAFT AND NEEDLE BAR MECHANISM
--
----
--- --~.r
0
@
I When pulley 0 t urns m the arrow d1rect1on. Its rotatmg motion IS conveyed to upper shaft f) to turn counter we1ght 0 .
2 The motion 1S conveyed to needle bar crank rod 8 v1a needle bar crank Owh1ch 1s connected to counter we1ght 0 The
shape
of arc motion 1s conveyed to th e thread hole 1n thread tak e-up lever ~ v1a thread take-up lever sl1de block 0
wh1ch 1s connec ted to need le bar crank rod 0
3 Needle bar 0 moves up and down v1a needle bar clamp 0 wh1ch IS connected to needle bar crank rod 0
4 Needle bar 0 IS gu1ded by needle bar support 0
(The arc motion 1s conveyed to the thread hole m thread take- up lever ~ v1a thread take- up leverslide block 0 wh1ch 1s
connec ted to needle bar crank rod 0 l
[I) NEEDLE FEED MECHANISM
When pulley 0 t urns 1n the arrow d1rect10n. ItS rotating motion IS conveyed to upper shaft f) to t urn t1m1ng belt wheel
upper 0
2 The mouon IS conveyed to t1m1ng belt wheel l ower 0 v1a tlmmg belt 0
3 Eccent r1c whee l 0 wh1ch 1s connec ted to lower shaft 0 rotates v 1a t1m1ng belt w he el lower 0 and lower shaft 0
4 Level feed arm ~ moves m the shape ol arc v 1a eccen triC wheel 0 . level feed connectmg rod 0 and level feed
connec tmg link O.
5 The moti on IS conveyed to needle bar rock crank 41) VIa feed ro ck s haft m.
6 Needle bar su pport G) mo ves back and forth VIa needle bar rock lmk m and needle bar connec ting rod 4D
7 Needle bar fD wh1ch IS connec ted to needle bar s upp ort G) moves back and forth .
- 5 -
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[I] LOWER SHAFT AND ROTARY HOOK MECHANISM
----~
i
---~
______=::~~ ----
1. When pu lley 0 turns in th e ar row direc tion. its r ota ting mot ion is conveyed to upper sha ft f) to turn timing belt whee l
upper 0 .
2. The moti on is conveyed to tim ing belt wheel lower 0 via t imi ng belt 0 .
3. As lower s haft 0 which is connec ted to tim ing belt wheel l ower 0 rotat es. spiral gear 8 is turn ed .
4. Rotary
h ook ~ rotates via pini on gear 0 which is connec ted to rotary h ook base O.
(Opener)
1. Open er crank 41) move s in the shape of an arc via rota ry hook ~ and ope ner link $ .
2. Op ener 4D which is co nn ected to opene r crank 41) moves in the shape of an ar c.
• The LS2-B837 sewing machine does no t c on tain a left side rotary hook. etc. because of the one ne edle.
IT] FEED MECHANISM
1. When pulley 0 t ur ns in the arrow directio n. its rotating motio n IS conveyed to up per sh aft f) to t urn t imi ng belt wheel
upper O.
2. The mot io n IS co nv eyed to t immg belt wheel l owe r 0 via t imi ng belt 0 .
3. Eccentric wheel 8 whi ch is co n nec ted to lower s haft 0 rot ates via t imi ng belt wheel lower 0 a nd lower sh aft 0 .
4. Level feed arm «!) moves in the sh ape of an arc via eccen t ric wheel 8 . level feed co nn ec ting r od 0 and level feed
connect ing link 0.
5. Feed bar 41) moves b ack and fort h via feed ro ck shaft tD .
6. Feed bar fork 4D moves up and d own by vertical feed ecce ntri Cwheel mwhi Ch IS connec ted to lower shaft o.
7. The m oveme nt of fe ed dog 1s f1xed by th e co mb inati on of move ments in 1tem 5 and 1tem 6.
- 6 -
From the library of: Superior Sewing Machine & Supply LLC

~.
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I
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!
i
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IT] THREAD TRIMMER MECHANISM
1.
2.
3.
4.
5.
6.
7.
8.
When thread trimming signal comes from synchronizer. solenoid 8 is ON and plunger 8 is pulled in the arrow
direction.
The motion
is conveyed to knife driving pin lever 8 via knife driving lever 8.
As knife main lever shaft 8 is pushed in the arrowdirection. knife main leverroller8 enters knifedriving cam recess e
which is connected to lower shaft 8.
According to the recess shape of knife driving cam e. the motion is conveyed to knife lockarm 6) via knife main lever
8. knife sub lever 0. knife length adjusting link CD. knife locklever right 4D and knife lockarm shaft G) (rightsliderside).
The motion
is conveyed to knife lock arm 6) via knife link 4B which is connected to knife lock lever right 49. knife lock
lever left
G) and knife lock arm shaft G) (left slider side).
Movable knife 0 which
is connected to slider fD is moved in the arrow direction.
The movable knife 0 returns while the roller of knife main lever8
is beingcontrolled by the shapeofknife driving cam
e.
After returning movable knife solenoid 8 is OFF. and knife main leverroller G is released from knife drivingcam recess
e.
[[] TENSION RELEASER MECHANISM
1.
2.
3.
4.
5.
6.
7.
When thread trimming signal comes from synchronizer. solenoid 8 is ON and plunger 8 is pulled in the arrow
direction.
The motion
is conveyed to knife driving pin lever 8 via knife driving lever 0.
As knife main lever shaft 8 is pushed in the arrow direction. tension release lock lever 0 is connected with tension
release cam portion of knife driving cam
8.
Roller of tension release lock lever 8 is pushed in the arrow direction by tension release cam portion of knife driving
cam8.
The motion is conveyed to tension release crank G) via tension release connecting rod lower e. tension release crank
lower
0. tension release crank upper CD tension release connecting rod upper 4D and tension release plate 8.
As tension release crank G) pushes presser bar lifter 41). tension disc 0 is moved via tension release bar 41. tension
release plate
fD and pin.
When solenoid 8
is OFF. t'ension disc is returned to its original position.
-7-
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[I] REVERSE ME C HANISM
~0
1. The reverse solenoid 0 (ON) works by micro switch 0 when the signal actuat or bar 0 is pressed.
2. The reverse solenoid
plunger 0 begins to operate. and the mot ton is conveyed to reverse levershaft 0 via reverse crank
0 .reverse link 0 . and reverse lever shaft arm G.
3. Wh en reverse lever shaft 0 rotates. the motion is conveyed to shaft «!> and feed regulat or 4D lever 0 .
4. The switch assembly «) changes from forward stitch to backward stitch by the inclination of feed regulator 4!) .
(Movement is conveyed to switch assembly «) via Switch arm 4f} by SWitCh connec ting arm fD ).
[!] THREAD WIPER
Thread w1per soleno1d
Thr ea d w1per L Thread w1per R
-8-
After thread trtmmtng. w 1th the mterval of 10 - 1 00
ms. thread w1per solenotd 0 1s ON.
2 The thread w1per so lenotd f) dr1ves thread w1pers L
and R
v1a solenotd lmk 0 . thread wiper li nk 0 .
ltnk B 0 .and thr ead w1per guide 0 .
3 In case th at thread wipe r 1s OFF. thread wiper returns
to
1ts orig tnal posttt on wtth the a1d of spnng G.
From the library of: Superior Sewing Machine & Supply LLC

l
I
I
J
J
I
I
[[] NEEDLE BAR (left and Right) MECHANISM TYPES 8835 and 8836
(To Stop the Right Side Needle Bar)
1. Move stop lever assembly 0 to the right side. (Push lever f) rises. and the convex part of the back s1de of stop lever 0
attaches to push lever f) and stops.)
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 O.
3. The slide bearing board assembly 8 which fits in slide shaft 0 moves to the right sidevia collar 8 and bearing board
spring
0.
4. The pin which is attached to the tipofthrust bearing boardassembly 8 moves sliding blockoperation shaft G) tothe left
side via moving crank
0.
5. Sliding block assembly 48 is moved to the rightside via sliding blockoperation lever CD whichfits in the pin screwaffixed
to sliding block operation shaft
G).
6. When the convex part of sliding block assembly fB contacts the clutch lever of needle bar connecting stud 41 attached
to needle bars fl). the clutch in needle bar connecting stud
41 breaks awayfrom needle bar~. and needlebar fl) stops.
• When the left side needle is caused to stop. the reverse sequence is performed.
(Cancellation of Needle Bar Termination)
1. When push lever f) is pressed. it becomes loosened from the convex part of the back side of stop lever 0 and is
returned to its original position
by lever shaft arm CD.
2. When stop lever 0 is returned to the middle position by lever shaft arm spring&. sliding block assembly fB returns to
center position via slide shaft 0. slide bearing board assembly 0. moving crank 0. sliding blockoperation shaft G>.
sliding block operation lever CD. etc.
3. The release pin of needle bar connecting stud
41 is pushed by the convex part of sliding block assembly CD and the
clutch fits into needle bars fl) again.
4. Needle bar G) can be raised and lowered.
-9-
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.,
[@] TOP FEED MECHANISM TYPES 8837 AND 8838
1. When machi ne pulley 0 turn s in the direction of the arrow. the rot at ion is conveyed to upper shaft 0 and causes the
rotation
of top feed eccentric wheel 0 .
2. The top feed eccentric wh ee l crank 0 is moved in an arc by top feed eccentric wheel 0 .via t op feed connecting rod 0 .
3. Motion is co nv eyed to be ll crank f) via top feed shaft 0 which is affixed to t op fe ed ecce ntri c wheel crank 0 .
4. Bell crank link f) causes the up - down mo t 10n of top feed presser link 0 via bell crank 0 .
5. Th e top feed presser link 0 is gu 1ded by the groove (oval) of middle presser gu 1de pla t e ~ and conveys mot1on to t op
feed presser bar Q) .
6. Middle presser @ affixed to top feed presser bar Q) IS caused to move up and down .
7.
By loosening wing nut CD and adjusting the position of hinge screw m.the amount of motion of top feed eccentriC
crank 0 is changed and alterati on of the amount of up - down motion of middle presser @ becomes possible.
- 10-
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~ UISASS.EMHL Y .PKUC.EU lJK.ES)
• These disassembly procedures are for model l T2 -8832 -403A. Other twin needle lock stitch machines may be
disassembled on the basis of these procedures.
ITJ COVER
Procedures
1. Loosen thumb screw 0. remove step screw 8 and washer 8. and remove the face plate 8.
2. Remove two screws 8 and remove top cover 0.
3. Remove bed slideR G and bed slide L 0.
4. Loosen screw Cl) and remove bed slide F 4]).
5. Remove two screws 4B and remove cover G).
6. Remove two screws CD and remove synchronizer cover 49 and washer (D.
7. Remove two screws 41 and remove needle position detector G).
[]] PRESSER MECHANISM
Procedures
1. Loosen two screws 0 and remove two needles f).
2. Loosen two screws 8 and remove thread wiper R 8 and thread wiper L 8.
3. Remove screw 0 and. after raising presser lift lever 8. remove presser foot 0.
4. Remove stud screw CD and remove knee lifter lever spring CD and knee lifter lever G).
5. Remove two screws 48 and connecting rod knee lifting joint ball bearing 8. Remove tension release connecting rod CD
(tension release indicating plate.)
6. Loosen presser adjustment screw 0 and remove spring
Cl).
7. Remove presser bar lifter guide 8.
8. Loosen flat screws G) and remove presser bar G). (Presser bar guide bracket fD. presser bar lifter fl. and presser bar
guide
fJ) disconnect.)
• Tension release shaft e disconnects when the machine is turned over.
-11-
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[!] THREAD WIPER
Procedures
1. Remove thread wiper spring O.
2. Remove plunger pin O.
trri-==f)~ c:====~~ Termrnal prn
.reD
c(~a.>
.........
-3. Remove solenoid link 0. thread wiper assembly 0. and rubber stopper 0.
4. Remove three flat screws 8 and remove thread wiper solenoid cover 0.
5. Remove four screws 0 and remove three cord braces 0.
12-prn plug
Termmal prn Terminal p1n
(black) (white)
6. Remove four flat screws CD and remove solenoid f). (Remove terminal pm from the 12-p1n plug.)
ffi ROTARY HOOK, LOWER SHAFT AND THREAD TRIMMER MECHANISM
(1) Rotary Hook
Procedures
1. loosen screw 0 and remove screw f); then remove throat plate 0.
2. Remove flat screw 0 and remove bobbin case opener 0 and washer 0 (nght and lef_t).
3. Turn over the mach1ne.
4. loosen three screws 8 (nght and left screws).
5. Remove two thread cutter return spnngs 0.
6. Turn the mach1ne upnght.
7. Remove screws 0 0 and remove movable kn1fe CD.
8. Turn the machme pulley and move the needle bar to the h1ghest pomt.
9. Remove two screws CD and remove feed dog CD.
10. Remove rotating hook fD and spacer CD (right and left).
• Be sure not to confuse the right and left rotary hooks fD and spacers CD when assembling.
-12-
From the library of: Superior Sewing Machine & Supply LLC

(2) Thread Trimmer
lever relurn s~l~lf
12-prn plug
-~~~~
fB~! . -~
~~---• : -~ Termmal pm (whrte)
C) A L fB Termrnal prn
~(@ (black)
Procedures
1. Remove two screws 0 and remove tension release connectmg rod 8.
2. Remove tension release return spring 0.
3. Turn the machine over.
4. Remove two ball
joint stud screws 0 and remove connecting rod assembly 0.
5. Remove two ball joint stud screws 0 and remove length adjustment connecting bar assembly 8.
6. Loosen screw 8 and remove pin lever 0 (shaft and forked lever).
7. Loosen screw
41) and remove sub lever shaft fD.
8. Loosen screw with hole$ and remove main lever shaft fl. tension release moving assembly e (main lever return
spring). and rubber
Gl.
9. Remove two flat screws 4D and remove thread tnmmer solenoid (D.
(Remove the prn terminal from the 12-prn plug.)
(3) Lower Shaft
Procedures
1. Remove t1mrng belt 8.
2. Remove switch mechanism sprrng G.
3. Remove screw 0 and remove spring peg O.
4. Remove flat screw 0 and remove feed bar fork 0 and washer 8.
5. Loosen screw 8 and remove set screw f).
6. Loosen two screws 41).
7. Loosen three screws fD (nght and left)
8. Loosen screw 8.
9. Loosen screw G) and two screws e. and remove timrng pulley 0 Gl.
10. Remove three screws fD and remove beanng presser fD.
11. Remove lower shaft 1). (At this time pinion G>. vertical feed eccentric wheel fl. horrzontal eccentric wheel fD. knife
driving cam fl. and spiral gear
f1 disconnect.)
• Place pinion G) and spiral gear fi in therr respective rotating hook positions. (Be sure not to misinsert them.)
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From the library of: Superior Sewing Machine & Supply LLC

(4) Thread Trimmer and Rotary Hook
Procedures
1. Loosen screw 0 (right and left).
2. Remove screw f) and remove washer 0 (right and left).
3. Loosen screw 8 and remove set screw 8 (right and left).
4. Remove lever L assembly 0 (moving shaft) and remove rocking arm 8.
5. Remove lever R assembly 0 (moving shaft) and remove rocking arm f).
L 6. Turn the machine upright.
7. Remove two flat screws 0 and remove slider assembly 4D (nght and left).
8. Turn the machine over.
9. Loosen two screws
4D and screws fD and ~- and raise feed bar G) forward.
10. Remove rotary hook baseL 49 and then rotary hook base R CD.
[[] REVERSE MECHANISM
12-pm plug
Term1nal pm (black)
Terminal
pm (wh1te)
Procedures
1. Turn the machine upright.
2. Remove screw 0 and remove reverse solenoid cover
f).
3. Remove stud screw 0.
4. Remove three flat screws 8 and remove reverse solenoid bracket 8.
5. Remove the pin terminal from the 12-pin plug.
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From the library of: Superior Sewing Machine & Supply LLC

[II NEEDLE BAR ROCKING SHAFT MECHANISM
Thread take-up lever
Procedures
1. Remove two flat screws 8 and remove side plate f).
2. Loosen screw f).
3. Loosen screw 8 and remove thread take-up shaft 0 while raising the tip of oil regulator reservoir 0.
4. Remove thread take-up lever 8. (The thread take-up lever slide block disconnects.)
5. Insert a wedge to needle bar rocking connecting bar 0 and remove needle bar rocking shaft assembly
0.
[I] REVERSE SWITCH MECHANISM
Term1nal pin (black)
Termmal pin (wh1te)
Procedures
1. Loosen flat screw 8 and remove actuator bar f).
2. Remove two flat screws 8 and remove micro switch case 8 and washer 0.
3. Remove two screws 0 and remove micro switch f).
4. Remove the terminal pin from the 12-pin plug.
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From the library of: Superior Sewing Machine & Supply LLC

l ASSEMBLY PROCEDURES)
OJ NEEDLE BAR ROCKING MECHANISM
Procedures
1 Make the w1ck 0 he slack on the bottom of the arm oil groove.
2
Alter placmg the needle bar rockmg shaft f) m the arm. 1nsert mto needle bar rockmg connectmg rod O.
• Place needle bar crank rod 0 onto needle bar crank 0 .
3 Install thread take-up lever 0 to thread take- up lever slidmg block 0 .
4. Install stud 0 wnh screw 0 .
• Insert stud 0 by l1ftmg t1p of oil reservo1r
ITJ LOWER SHAFT, THREAD TRIMMER AND ROTARY HOOK MECHANISM
(1) Lower Shaft (Part One)
Proc edu res
1. Turn the machme over
2. Install rotary
hook base R 0 and then rotary hook base L f) .
• Install rot at1ng hook bases 0 and f) w1thout t he felt prot rudmg .
3 Insert feed bar 0 between rotary hook bases 0 and f)
4 I ns tall ho nzontal teed shalt 0 w1th t wo screws 0 .
• Install homon tal feed sha lt 0 w1t h screws 0 so that there 1s no lelt- n ght play.
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From the library of: Superior Sewing Machine & Supply LLC

~
Lower Shaft (Part Two)
Procedures
5. As shown 1n the diagram. place the lower shaft m 1ts bed and 1nstall 1n the followmg sequence: knife driving cam f).
horizontal eccentric wheel Cl). spiral gear C). vertical feed eccentric wheel«!). and Spiral gear C) onto lower shaft 0.
6. Fasten bearing presser 4D with screw 0.
7. Install timing pulley 0 f» to lower shaft 0 with screw G) and screw$.
• Tighten screw G) to screw seat of lower shaft O.
8. Install knife driving cam f) to lower shaft 0 with set screw 4D and screw 0).
• Tighten set screw ~ to screw seat of lower shaft 0 and then fasten screw 0).
9. Install horizontal eccentric wheel 0 with two screws Cl).
• Tighten screw 41 in front of lower shaft 0 rotating d1rect1on to the screw seat
10. Install vertical feed eccentric wheel «!> w1th screw CB.
• Tighten screw CB to screw seat.
(2) Thread Trimmer and Rotary Hook
fD
spacen~ - .. spacer
fJ) ~ Cfj
f)
Procedures
11 .
12.
13.
14.
15.
16.
17.
18.
19.
20.
Turn the machine upright.
Install slider assembly 0 to rotary hook bases e and 8 With two flat screws • (nght and left).
• Verify that slider assembly 0 operates smoothly (right and left).
Turn the machine over.
Insert lever L 0 and rockmg arm shaft 0 to rotary hook base 8. and install rockmg arm f) with set screw 0 and
screw
0.
Insert lever assembly R«!)androckmg arm shaft 0 to rotatmg hookbase 8. and mstall rocking arm f) with set screw
0 and screw f).
Temporarily fasten rotary hook bases 8 and 8 with screw 0 and washer 0 (nght and left).
Insert feed bar fork
G) to vertical feed eccentric wheel G) and install with flat screw 41 and washer ~.
Place pinion 0) into grooved portion of rotary hook bases 8 and 0.
Place rotary hooks G) (spacer) on rotary hook bases 8 and 8 and pinion 0). andthen temporarilyfasten with screw
••
Temporarily fasten feed dog ~with two screws f».
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From the library of: Superior Sewing Machine & Supply LLC