Brother b831 User manual

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CONTENTS [Model B831 6832 8835 6836 8882]
( NAMES OF MAIN PARTS ) i
(specifications) 3
( MECHANISM ) 6
CD Upper shaft and needle bar mechanism 5
(UNeedle feed mechanism 5
d]
Lower shaft and rotary hook mechanism 6
[UFeed mechanism 6
d] Thread trimmer mechanism 7
d] Tension releaser mechanism 7
dl Reverse mechanism 8
d] Thread wiper 8
[9] Needle bar (left and right) mechanism types
B835 and B836 9
(13 Top feed mechanism types 8837 and B838 10
rDISASSEMBLY PROCEDURES ^ 11
\B831. B832, B835, B836. B882y
d] Cover 11
(UPresser mechanism 11
|T|Thread wiper 12
d] Rotary hook, lower shaft and
thread trimmer mechanism 12
d] Reverse mechanism 14
d] Needlebar rocking shaft mechanism 15
d] Reverseswitch mechanism 15
(assembly procedures) 16
[T|Needle bar rocking mechanism 16
[T] Lower shaft, thread trimmer and
rotary hook mechanism 16
(HPresser mechanism 21
(T|Thread wiper 21
d] Reverse switch mechanism 23
d] Reverse mechanism 23
d] Cover 24
/STANDARD ADJUSTMENTS A 25
VB831, 8832, 8835, 8836, B882y
d] Needle and feed timing (B831) 25
d] Adjustment of needle barto presser bargap
(Models 8831, 8832, 8835, 8836. 8882) 28
d] Needleand rotary hook timing adjustment 29
d] Rotary hookto needle plate gap 31
d] Rotary hookto bobbin case opener gap 31
d] Presser foot height adjustment 32
d] Feed dog height adjustment 33
d] Tension release adjustment 34
d] Stitch length adjustment 35
(13 Reverse feed solenoid adjustment 36
[n]Thread wiper adjustment 37
iniSlider adjustment 39
[13 Movable and fixed knife adjustment 40
03 Knife mam lever roller 42
HE Knife driving lever adjustment 42
(13 Positiondetector adjustment 43
03Corner sewing position adjustment
(8835, 8836) 43
03Timing belt replacement 47

CONTENTS [Model B837 B838]
CDISASSEMBLY PROCEDURES\ 48
VB837, B838 J
(T) Cover 48
(H Tension release lever 49
Uj Presser foot and walking bar 49
G] Needle bar and needle thread take-up 51
UlFeed assembly 51
( ASSEMBLY PROCEDURES ) 52
[0 Feed assembly 52
[O Needle bar 52
(HWalking bar and presser foot 53
[T) Tension release lever 57
[O Cover 58
/STANDARD ADJUSTMENT^ 59
\^B837, B838 J
Q]Needle and feed timing adjustment (standard) .. 59
UlFeed dog adjustment in back and forth
directions 60
UlNeedle and rotary hook timing adjustment 61
0Clearance between rotary hook and
needle plate 62
0Clearance between rotary hook and
bobbin case opener 62
0 Presser foot height adjustment 63
0 Feed dog height adjustment 64
0Vibrating presser foot and lifting presser foot
and needle timing adjustment 65
0 Upper feed adjustment 65
0 Vibrating presser foot and lifting presser foot
vertical stroke adjustment 66
"GAUGE PARTS LIST FOR
DOUBLE NEEDLE LOCK STITCH
sSEWING MACHINES 67
( others) 75
(XlTop cover thread guide 75
UlAdjusting upper thread length 75
UlAnti-spinning spring 76
[H Bobbin 76
G]To thread bobbin
cases (8835. 8836) 76
(troubleshooting guide) 77

NAMES OF MAIN PARTS
< Model LT2-B831 >
I
<Model LT2-B832>
<Model LT2.B882>
Xv
LT2-B831
Sewing speed
Stitch length
Pfesser foot
height
Feed dog height
Needles
LT2-B832
Forlhm Forlhick
malenals I
materials
4000 spm
3000 spm
0~4 mm
0~5 mm
7 mm
Use
For thin
materials
For medium-
thick
materials
For thick
materials
Sewing speed
1 4000 spm
3000 spm
Stitch length
0~ 4 mm
0~5 mm
Presser
foot
height
Presser foot
lifter
7 mm
Knee lifter
7 mm
Feed dog height
1 mm
Needles DP x 5
DPxS^'l 1DPx5''l4 DPx5^22
LT2-B882
Sewing speed
Stitch length
foot .
height Knee lifter
Feed dog height
Needles DP x 5
For medium-thick
materials
For thick
materials
3000 spm
0~7 mm (Special order 8mm)
7 mm
1 2.7 mm
1.0 mm
DPx5" 14 DPx5"22

4^:!:
LT2-B835
Sewing speed
Sliich length
Presser fool
height
Feed dog height
Needles
LT2-B836
Sewing speed
Stitch length
Presser foot
Presser ||„er
fool
height Knee lifter
Feed dog height
Needles
For medium-lhick
materials
For thick
materials
3000 spm
5 mm
1.0 mm
DP X 5
For medium-thick
materials
5
For thick
materials
3000 spm
10.5 mm
1.0 mm
DPx 5
LS2-B837
Use '
For thick materials
Sewing speed
3000 spm
Max. stitch length
8 mm
Presser foot Presser foot lifter 1
0.5 mm
height Knee lifter 1 6
mm
Feed dog height
1.0 mm
Needle
DPx 17
LT2-B838
Use
For thick materials
Sewing speed
3000 spm
Max. stitch length
8 mm
Presser foot
Presser foot lifter
10.5 mm
height
Knee lifter
1 6 mm
Feed dog height
1.0 mm
Needle
DP X 17

Treadle unit

Bi Motor pulley
Medium
LT2-B832-403A
703A
LT2-B835-403A
703A
50 Hz
60 Hz
50 Hz
60 Hz
Machine speed
4000 spm
3000 spm
Motor Pulley
Size
Part No.
1 20 Pulley
224545-000
105 Pulley
226389-000
105 Pulley
226389-000
90 Pulley
224506-001
Belt Cover
# No.
Part No.
#12-2
224547-001
#12-1
226393-001
#12-1
226393-001
Treadle Unit
H No.
Part No.
#5-38
224396-038
#5-30
224396-030
Control Box
Assembly
V
Part No.
110/220 V 100/200 V
226531-001 226426-001
110/220V 100/200V
226531-002 226426-002
Thick
LT2-B832-405A
705A
LT2-B835-405A
705A
LS2-B837-300A
50 Hz
60 Hz
50 Hz
60 Hz
Machine speed
3000 spm
3000 spm
Motor Pulley
Size
Part No.
105 Pulley
226389-000
90 Pulley
224506-001
105 Pulley
226389-000
90 Pulley
224506-001
Belt Cover
# No.
Part No.
#12-1
226393-001
#12-1
226393-001
Treadle Unit
.« No.
Part No.
#5-30
224396-030
#5-30
224396-030
Control Box
Assembly
V
Part No.
110/220V . 100/200 V
226531-002 226426-002
110/220 V . 100/200 V
226531-002 226426-002
* When ordering amotor be sure to specify the sewing machine model number, intended materials to be used, and either
single or three phase.
*Parts in the above table are for both single 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 ordering any parts.
(2) Motor pulley change
(fr.
10 mm
-4-
Use the V-belt included together with the machine
head. After installing the belt, loosen both hexagon
nuts O. and adjust the tension of the belt. Make sure
that the correct belt tension is maintained. Then
tighten the hexagon nuts.
The belt can be depressed about 10 mm with afinger.

mm
When pulley O turns inthearrowdirection, itsrotating motion is conveyed touppershaftO toturncounterweightO-
The motion is conveyed to needlebarcrankrod 0via needlebarcrankO which isconnectedtocounterweight©.The
shape of arc motion is conveyed to the thread hole in thread take-up lever ©via thread take-up lever slide block O
which IS connected to needle bar crank rod 0.
Needle bar O moves up and down via needle bar clamp 0 which is connected to needle bar crank rod 0.
Needle bar O is guided by needle bar support O
(The arc motion is conveyed to the thread hole in thread take-up lever © via thread take-up leverslide block ©which is
connected to needle bar crank rod 0).
U] NEEDLE FEED MECHANISM
\W o
When pulleyO turns inthe arrowdirection, its rotating motionis conveyedto upper shaft O to turn timing beltwheel
upper 0.
The motion is conveyed to timing belt wheel lower 0 via timing belt ©.
Eccentric wheel O which is connected to lower shaft 0 rotates via timing belt wheel lower 0 and lower shaft ©.
Level feed arm © moves in the shape of arc via eccentric wheel O. level feed connecting rod O and level feed
connecting link 0
The motion is conveyed to needle bar rock crank ® via feed rock shaft o
Needle bar support © moves back and forth via needle bar rock link © and needle bar connecting rod ©.
Needle bar © which is connected to needle bar support © moves back and forth.

[U LOWER SHAFT AND ROTARY HOOK MECHANISM
1. When puiley O turns inthe arrowdirection, its rotating motion is conveyed to uppershaft O to turn timing beltwheel
upper O'
2. The motion is conveyed to timing belt wheel lower 0 via timing belt O.
3. As lowershaft O which is connected to timing belt wheel lower O rotates, spiral gear O is turned.
4. Rotary hook rotates via pinion gear O which is connected to rotary hook base O-
(Opener)
1. Opener crank 0 moves in the shape of an arc via rotary hook 0 and opener link ©.
2. Opener 0 which is connected to opener crank 0 moves in the shape of an arc.
• The LS2-B837 sewing machine does not contain a left side rotary hook. etc. because of the one needle.
E FEED MECHANISM
m.
When pulley O turns in the arrow direction, its rotating motion is conveyed to upper shaft O to turn timing belt wheel
upper
O.
The motion is conveyed to timing belt wheel lower O via timing belt O.
Eccentric wheel O which Is connected to lower shaft Orotates via timing belt wheel lower O and lower shaft O.
Level feed arm 0 moves in the shape of an arc via eccentric wheel O. level feed connecting rod 0 and levelfeed
connecting link 0.
Feed bar 0 moves back and forth via feed rock shaft 0
Feed bar fork 0 moves up and down by vertical feed eccentric wheel 0 which is connected to lower shaft ©.
The movement of feed dog is fixed by the combination of movements in item 5 and item 6.

d] THREAD TRIMMER MECHANISM
1.
2.
3.
5.
6.
7.
When thread trimming signal comes from synchronizer, solenoid O is ON and plunger O is pulled in the arrow
direction.
The motion is conveyed to knife driving pin lever O via knifedriving lever O-
As knife main lever shaftO ispushedinthe arrow direction, knife main lever roller O enters knife driving camrecessO
which is connected to lower shaft O-
According to the recess shape of knifedriving cam O. the motion is conveyed to knifelockarm 0 via knifemain lever
O, knife sub lever O. knife lengthadjustingIink0. knife lockleverright®and knife lockarmshaft©(rightsliderside).
The motion isconveyed to knife lock arm 0 via knife link 0 which isconnected to knife lock lever right®, knife lock
lever left 0 and knife lock arm shaft 0 (left slider side).
Movable knife 0 which is connected to slider 0 is moved in the arrow direction.
The movable knife 0returns while the roller of knife main lever O is being controlled by theshapeof knife driving cam
8. After returning movable knife solenoid O is OFF, and knife main lever roller O isreleased from knife driving camrecess
ID TENSION RELEASER MECHANISM
2.
3.
5.
6.
7.
Tension
release
cam
Roller
When thread trimming signal comes from synchronizer, solenoid O is ON and plunger O is pulled in the arrow
direction.
The motion is conveyed to knife driving pin lever O via knife driving lever O.
As knife main lever shaft 0 is pushed in the arrow direction, tension release lock lever O is connected with tension
release cam portion of knife driving cam O.
Rollerof tension release lock lever O is pushed in the arrow direction bytension release cam portion of knifedriving
cam O.
The motion is conveyed to tension release crank 0 via tension release connecting rod lower O, tension release crank
lower O, tension release crank upper 0 tension release connecting rod upper 0 and tension release plate 0.
As tension release crank 0 pushes presser bar lifter ®. tension disc 0 is moved via tension release bar 0. tension
release plate 0 and pin.
When solenoid O is OFF, tension disc is returned to its original position.
-7-

®—T
^0
The reverse solenoid O (ON) works by micro switch O when the signal actuator bar O is pressed.
The reverse solenoid plunger O begins to operate, and the motion isconveyed to reverse levershaft O viareverse crank
O, reverse link O. and reverse lever shaft arm O-
When reverse lever shaft O rotates, the motion is conveyed to shaft and feed regulator O lever O.
The switch assembly © changes from forward stitch to backward stitch by the inclination of feed regulator ©.
(fvlovement is conveyed to switch assembly © via switch arm © by switch connecting arm ©).
a
THREAD WIPER
Thread wiper L-
Thread wiper solenoid
I
—o
——@
^ —^Stopper
•Thread wiper R
After thread trimming, with the interval of 10 ~ 1 00
ms. thread wiper solenoid O is ON,
The thread wiper solenoid Odrives thread wipers L
and R via solenoid link O' thread wiper link O-
link B O- ahd thread wiper guide O-
In case that thread wiper is OFF, thread wiper returns
to Its original position with the aid of spring O-

m NEEDLE BAR (Leftand Right) MECHANISM TYPES B835 and B836
(To Stop the Right Side Needle Bar)
1. Movestop lever assembly O to the right side. (Push lever O rises, and the convex part of the back side of stop lever O
attaches to push lever O and stops.)
2. Levershaft arm O and slide shaft O are moved to the right side via lever shaft arm
©which is attached to stop lever
assembly
©.
3. The slide bearing board assembly © which fits inslide shaft © moves to the right side viacollar © and bearing board
spring ©.
4. The pinwhich is attached to the tipofthrust bearing board assembly © movesslidingblockoperation shaft © to the left
side via moving crank ©.
5. Sliding blockassembly © is movedtothe rightside viasliding blockoperation lever© whichfitsinthe pinscrew affixed
to sliding blockoperation shaft ©.
6. When the convex part of sliding block assembly ©contacts the clutch lever of needle bar connecting stud ©attached
to needle bars ©, the clutch inneedle bar connecting stud © breaksawayfromneedle bar© and needle bar © stops.
* When the left side needle is caused to stop, the reverse sequence is performed.
(Cancellation of Needle Bar Termination)
When push lever © is pressed, it becomes loosened from the convex part of the back side of stop lever © and is
returned to its original position by lever shaft arm ®.
When stop lever © is returned to the middle position by levershaft arm spring ©, sliding block assembly ©returns to
center position via slide shaft ©, slide bearing board assembly ©, movingcrank ©, sliding blockoperation shaft ©,
sliding block operation lever ®, etc.
The release pin of needle bar connecting stud © is pushed bythe convex part of sliding block assembly © and the
clutch fits into needle bars © again.
Needle bar © can be raised and lowered.
1.
2.
3.
-9-

m
When machine pulley O turns in the direction of the arrow, the rotation is conveyed to upper shaft O and causes the
rotation of top feed eccentric wheel O-
The top feed eccentric wheel crank O is moved in an arc bytop feed eccentricwheel
O' viatop feed connecting rod O-
Motion is conveyed to bell crank O via top feed shaft O which is affixed to top feed eccentric wheel crank O.
Bell crank link O causes the up-down motion of top feed presser link O via bell crank O-
The lop feed presser link O 'S guided by the groove (oval)of middle presser guide plate <E> and conveys motion to top
feed presser bar
O.
Middle presser ® affixed to top feed presser bar ® is caused to move up and down.
By loosening wing nut ® and adjusting the position of hinge screw the amount of motion of lop feed eccentric
crank O is changed and alteration of the amount of up-down motion of middle presser ®becomes possible.

^DISASSEMBLY FKOCEUUKES J
* These disassembly procedures are for model LT2-B832-403A. Other twin needle lock stitch machines may be
disassembled on the basis of these procedures.
[U COVER
©
Procedures
1. Loosen thumb screw O. remove step screw O and washer O. and remove the face plate O-
2. Remove two screws 0 and remove top cover 0.
3. Remove bed slide R 0 and bed slide L 0.
4. Loosen screw 0 and remove bed slide F 0.
5. Remove two screws ® and remove cover 0.
6. Remove two screws 0 and remove synchronizer cover 0 and washer 0.
7. Remove two screws 0 and remove needle position detector 0.
PRESSER MECHANISM
©
©©
©
©
Procedures
1. Loosen two screws 0 and remove two needles 0.
2. Loosen two screws 0 and remove thread wiper R 0 and thread wiper L 0.
3. Remove screw 0 and. after raising presser lift lever O. remove presser foot 0.
4. Remove stud screw 0 and remove knee lifter lever spring 0 and knee lifter lever 0.
5. Remove two screws 0 and connecting rod knee liftingjoint ball bearing 0. Remove tension releaseconnecting rod 0
(tension release indicating plate.)
6. Loosen presser adjustment screw 0 and remove spring 0.
7. Remove presser bar lifterguide 0.
8. Loosen flat screws 0 and remove presser bar 0. (Presser bar guide bracket 0. presser bar lifter 0, and presser bar
guide 0disconnect.)
*Tension release shaft 0 disconnects when the machine is turned over.
-11 -

CD THREAD WIPER
Terminal pin
1 2-pin plug
Procedures
1.
2.
•3.
4.
5.
6.
Terminal pin
(black)
Terminal pin
(white)
Remove thread wiper spring O-
Remove plunger pin O-
Remove solenoid link O- thread wiper assembly 0. and rubber stopper 0.
Remove three flat screws O and remove thread wiper solenoid cover 0.
Remove four screws 0 and removethree cord braces 0.
Remove four flat screws 0 and remove solenoid ®. (Remove terminal pin from the 12-pin plug.
(U ROTARY HOOK, LOWER SHAFT AND THREAD TRIMMER MECHANISM
(1) Rotary Hook
Procedures
1. Loosenscrew O and remove screw 0: then remove throat plate 0.
2. Remove flat screw 0 and remove bobbin case opener0 and washer 0 (right and left).
3. Turn over the machine
4. Loosen three screws O (right and left screws).
5. Remove two thread cutter return springs 0.
6. Turn the machine upright.
7. Remove screws 0 0 and remove movable knife 0
8. Turn the machine pulley and move the needle bar to the highest point.
9. Remove two screws 0 and remove feed dog 0.
10. Remove rotating hook 0 and spacer 0 (rightand left).
* Be sure not to confuse the right and left rotary hooks 0 and spacers 0 when assembling.
-12-

(2) Thread Trimmer
<§fc3 11 II -00 \ W
I 0-^0^
Procedures
1.
2.
3.
4.
5.
6.
7.
8.
Lever return spring
A \Terminal pin
12-pin plug
o o
o o o
Terminal pin (white)
nal pin
(black)
Remove two screws O snd remove tension release connecting rod O
Remove tension release return spring O.
Turn the machine over.
Remove two ball joint stud screws O 3nd remove connecting rod assembly 0.
Remove two ball jointstud screws O and remove length adjustment connecting bar assembly O.
Loosen screw O and remove pin lever O (shaft and forked lever).
Loosen screw 0 and remove sub lever shaft ®.
Loosen screw with hole® and remove main lever shaft ®. tension release moving assembly ® (main lever return
spring), and rubber ©.
Remove two flat screws © and remove thread trimmer solenoid ®.
(Remove the pin terminal from the 12-pin plug )
Lower Shaft
Procedures
1.
2.
3.
4.
5.
6.
7
8.
9.
10.
11.
Remove timing belt O.
Remove switch mechanism spring O.
Remove screw 0 and remove spring peg O.
Remove flat screw 0 and remove feed bar fork0 and washer O.
Loosen screw 0 and remove set screw 0.
Loosen two screws 0.
Loosen three screws 0 (right and left)
Loosen screw 0
Loosen screw 0 and two screws 0. and remove timing pulleyD ®.
Removethree screws 0 and remove bearing presser 0.
Remove lower shaft 0. (At this time pinion 0, vertical feed eccentric wheel 0, horizontal eccentric wheel 0, knife
driving cam 0, and spiral gear 0 disconnect.)
* Place pinion 0 and spiral gear 0 in their respective rotating hook positions. (Be sure not to misinsert them.)
-13-

Thread Trimmer and Rotary Hook
© o
Procedures
1. Loosen screw O (right and left).
2. Remove screw O and remove
washer O (right and left).
3. Loosen screw O and remove set screw 0 (right and left).
4. Remove lever Lassembly 0 (moving shaft) and remove rocking arm O.
5. Remove lever R assembly 0 (moving shaft) and remove rocking arm Q.
6. Turn the machine upright.
7. Remove two flat screws 0 and remove slider assembly 0 (right and left).
8. Turn the machine over.
9. Loosen two screws 0 and screws ® and ©, and raise feed bar © forward.
10. Remove rotary hook base L © and then rotary hook base R ©.
0REVERSE MECHANISM
1 2-pin plug
Procedures
1. Turn the machine upright.
2. Remove screw O and remove reverse solenoid cover 0.
3. Remove stud screw 0.
4. Remove three flat screws O and remove reverse solenoid bracket 0.
5. Remove the pin terminal from the 12-pin plug.
-14-
• Terminal pm (black)
• Terminal pin (white)

[U NEEDLE BAR ROCKING SHAFT MECHANISM
Procedures
1.
2.
3.
4.
5.
Thread take-up lever
Remove two flat screws O and remove side plate O-
Loosen screw O-
Loosen screw O and remove thread take-upshaft 0 while raisingthe tip of oil regulator reservoir 0.
Remove thread take-up lever O. (The thread take-up lever slide block disconnects.)
Insert a wedge to needle bar rocking connecting bar 0 and remove needle bar rocking shaft assembly 0.
0REVERSE SWITCH MECHANISM
S)
1 2-pin plug
o o o o
o o o o
Terminal pin (black)
Terminal pin (white)
Procedures
1. Loosen flat screw 0 and remove actuator bar 0.
2. Removetwo flat screws 0 and remove micro switch case 0 and washer 0.
3. Remove two screws 0 and remove micro switch O.
4. Remove the terminal pin from the 12-pin plug.
-15-

ASSEMBLY PROCEDURES
Q] NEEDLE BAR ROCKING MECHANISM
OtI reservoir
Screw seal of stud
Procedures
1. Make the wick O he slack on the bottom of the arm oil groove.
2. After placing the needle bar rocking shaft O mthe arm. insert into needle bar rocking connecting rod O-
* Place needle bar crank rod O onto needle bar crank O.
3. Install thread take-up lever 0 to thread take-up lever sliding block O.
4. Install stud O with screw Q.
• Insert stud O by lifting tip of oil reservoir.
[U LOWER SHAFT, THREAD TRIMMER AND ROTARY HOOK MECHANISM
(1) Lower Shaft (Part One)
m•
Procedures
1. Turn the machine over.
2. Install rotary hook base R O and then rotary hook base L O.
* Install rotating hook bases O and O without the felt protruding,
3. Insert feed bar O between rotary hook bases O and O
4. Install horizontal feed shaft O with two screws 0.
* Install horizontal feed shaft O with screws 0 so that there is no left-right play.
- 16 -

Lower Shaft (Part Two)
--r;-^-^. J • '; ' 1>
"4 "• ^
"• . "
!----(?• ---1-
'4
Procedures
5. As shown inthe diagram, place the lower shaftinits bedand install inthe following sequence; knife driving camO-
horizontal eccentric wheel O- spiral gear O- vertical feed eccentric wheel ®. and spiral gear O onto lower shaft O-
6. Fasten bearing presser (D with screw ®.
7. Install timing pulley D © to lower shaft O with screw © and screw ©.
*Tighten screw © to screw seat of lower shaft O
8. Install knife driving cam O to lower shaft O with set screw © and screw ©
* Tighten set screw © to screw seat of lowershaft O and then fasten screw ©
9. Install horizontal eccentric wheel O with two screws ©.
* Tighten screw © in front of lower shaft O rotating direction to the screw seat
10. Install vertical feed eccentric wheel © with screw ©
* Tighten screw © to screw seat.
(2) Thread Trimmer and Rotary Hook
spacer
Spacer
Spacer
Procedures
11. Turn the machine upright.
Install slider assembly O to rotary hook bases © and O with two flat screws O (right and left).
* Verify that slider assembly O operates smoothly (right and left).
Turn the machine over.
Insert lever LO and rocking arm shaft O to rotary hook base ©• and install rocking arm © with set screw © and
screw ©.
Insert lever assembly R© and rocking arm shaft ©to rotating hook base © and install rocking arm © with set screw
© and screw ©.
Temporarily fasten rotary hook bases © and © with screw © and washer © (right and left).
Insert feed bar fork © to vertical feed eccentric wheel © and install with flat screw © and washer ©
Place pinion © into grooved portion of rotary hook bases © and ©.
Place rotary hooks © (spacer) on rotary hook bases © and © and pinion ©. and then temporarily fasten with screw
12
13
14
15
16
17
18
19
©
20. Temporarily fasten feed dog © with two screws ©
- 17-