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Parts Manual - English - Page 2
BROTHER INDUSTRIES, LTD.
• T-8420B-0
0: CriZEliftif/ Minimum lubrication type
1
3: It 41±4tI Semi dry type
3: 41174t / Medium-weight materials
5: J4 / Heavy-weight materials
F:
a Foundation garments
Parts Manual - English - Page 14
...CODE Q'TY
a
NAME OF PARTS... SUPPORTER
...SET SCREW SOCKET (FT) M6X6
34
SA2528101 1 9'i i6
SHOULDER SCREW, M6
35
SA2529101 1 tm'./ -(1,/i-
F-ROCKER CONNECTING ROD ASSY
9
143612100 1 .-f, -(71-
DIAL LOCK LEVER
28
S39830101 1 Y-f-V)i,Eiv%/ii-/I )-(*) (E.s.. REVERSE STITCHING LEVER
40
SA2531001 1 ti.'./ -fl,ii - 71--Iti/i/s
SPRING
41
SA3067001 1 l ii--))'-(iz
LEVER GUIDE...8420B...
Parts Manual - English - Page 16
...FEED ROCKER SHAFT BUSH, R WICK, 4X4 L=250 SET SCREW M6 SET SCREW SOCKET (FT) M6X6 SET SCREW COLLAR SET SCREW, SOCKET (FT) M6X6 FEED ROCKER SHAFT ...SET SCREW SOCKET (FT) M6X6 FEED ROCKER BASE ARM SCREW, M5X12 WICK, 4X4 L=180 FEED BAR SLIDE BLOCK ASSY SCREW, FLAT #0 M2X4 WICK SUPPORT SCREW PAN M4X6 WICK, L=400 OIL TUBE, L=100 F. A9
/ Feed shaft mechanism
REF.NO CODE QTY
i!li'lt
NAME OF PARTS...
Parts Manual - English - Page 18
...SCREW ASSY
24
SA2574001 3 f-,(*M6ts), (
SET SCREW, (FT) M6
25
SA3054001 1 A5AF--if-
I
FELT SUPPORT
32
062400616 1 t- 4X6
SCREW PAN ... O-LEVER SHAFT WICK, 4X4 L=100 SET SCREW SOCKET (FT) M5X5
T-8420B-301 øû OPENER LINK OPENER...S07420000 1 =- - i 713M / Rotary hook mechanism
REF.NO CODE Q'TY
NA
NAME OF PARTS
RM
1
SA2755101 1 t7KY-(842ST(L) i.z.
1
SA2950101 1 t7FY-(...
Parts Manual - English - Page 20
...SUPPORT...4X4
SCREW, PAN M4X4
T-8420B-301 øý FELT DR ...SET SCREW, (FT) M6
35
SA2579001 1 AAF-A-fif*
SPECER
36
SA4043001 1 7I/I *n46x25
46
SA2567001 2 /\IJA*9 02-ts.')-(
47
SA2568001 2 /' 1)A*9 03-
OPENER
17
154965001 1 7 -3- */I.1-3.57X8
BOLT, SOCKET SM3.57X8
34
SA2563101 1 tvEY-rtii - Gl. 7I30{*-, / Rotary hook mechanism
REF.NO CODE Q'TY
i§',A
NAME OF PARTS...
Parts Manual - English - Page 30
M. 4.tiA LAM / Threading mechanism
REF.NO CODE Q'TY
PA
NAME OF PARTS
RM
1
SA3417001 1 r,r7-0- 91-71 .-*-. 3
2
SA3415001 2 -11- 91"),/it -...PLATE ASSY TENSION STUD THREAD TAKE-UP SPRING, L GUIDE ASSY, T/TAKE-UP SPRING SPACER THREAD TAKE-UP SPRING, R COLLAR STOPPER SUPPORT NUT 1 M3 SET SCREW, (CP) M3.5 SPRING GUIDE SET SCREW ADJUSTING THUMB SET SCREW, (CP) M3.5 COLLAR TENSION NUT STOPPER ...
Parts Manual - English - Page 32
..., M4X5 BOBBIN SUPPORT BOBBIN WINDER LEVER SPRING BOBBIN WINDER BASE SPRING O RING, SS5 BOBBIN WINDER FIXED SCREW KNIFE SCREW PAN M5X6 BOBBIN WINDER TENSION ASSY DISC, TENSION TENSION SPRING TENSION NUT WASHER SET SCREW SOCKET (FT) M5X5
T-8420B-402 ùÿ N. *OM / Bobbin winder mechanism
REF.NO CODE Q'TY
NA
NAME OF PARTS
RM
1
SA1971101...
Parts Manual - English - Page 36
...-B
PIPED SCREW SET, B
8
150206002 1 L5+f)f 16
WASHER, PLAIN 16
9
S38648001 1 6t9tVI-U5/8
NUT, U518-28
10
150174000 1 a5./_..4--k,-. COLUMN PIPE W/CAP
14
150174000 1 7.1-..*-VVI
COLUMN CAP
15
156112003 1 7./..,./ i -(ID
COLUMN PIPE, D
16
150173003 1 D5./..-)a 4:4-
" 5X8
SCREW PAN M5X8
T-8420B-910 úù a NJ% / Accessories
REF.NO CODE Q'TY
i!li'a
NAME OF PARTS
RM...
Instruction Manual - English - Page 40
... the power switch and disconnect the power cord before calling for repairs or service.
y Is the V-belt installed?
2 Upper thread is turned on y Is the power cord disconnected? y Has the thread been threaded incorrectly? y Is the thread take -up amount.
27
0977M
T-8420B, 8450B, 8720B, 8750B
34
y Is the bobbin not turning smoothly?
when...
Instruction Manual - English - Page 41
... y Is the thread take -up spring. Set the thread take -up spring too weak?... * * 19
20
Grooves Slot
2946M
2944M
35
T-8420B, 8450B, 8720B, 8750B 10.
Pull about 50 mm...a presser foot with a count that is incorrect, install the needle correctly.
y Is the needle too thin...replace the needle. TROUBLESHOOTING
Problem
Possible cause
4 Skipped stitches occur y Is the needle tip bent?
Instruction Manual - English - Page 42
TROUBLESHOOTING
Problem 6 Uneven seam
Possible cause
...-alloy bobbins specified by Brother.
2951M
2124M
17-18 16
17-18
T-8420B, 8450B, 8720B, 8750B
36 y Is the lower thread tension too strong? Set the bobbin so that 80... when the lower thread is not turning smoothly, replace the bobbin. Use only bobbins which are specified by Brother
being pulled? 10. The bobbin winding amount should...
Instruction Manual - English - Page 3
...;C to slip, and your Brother dealer or a qualified electrician ...problems with correct operation.
ii
T-8420B, 8450B, 8720B, 8750B Any fluctuations in an area which are greater than the requirements for the machine. Excessively dry or humid environments and dew formation may cause your skin, otherwise inflammation can cause vomiting and diarrhea.
2. The installation...
Instruction Manual - English - Page 40
...motor's inertia. Items with medium-weight material specifications, poor thread tightening may operate if the treadle is turned on the underside, or replace the feed dog with a fine grain or .... 10. TROUBLESHOOTING
y Please check the following remedies do not fix the problem, turn off the power switch and disconnect the power cord before calling for repairs or service. CAUTION
Turn...
Instruction Manual - English - Page 41
...Replace the needle with a count that is incorrect, thread the thread correctly.
Thread unravelling at y Is the thread take -up spring operating range too large?
Page
14 16-20
26
* * 27 * * 19
20
Grooves Slot
2946M
2944M
35
T-8420B, 8450B, 8720B, 8750B y Is the presser foot pressure too weak? Set..., install the needle correctly.
start .
TROUBLESHOOTING
Problem
Possible...
Instruction Manual - English - Page 42
...replace it turns in the V-belt
2948M
when it is damaged, smooth it with a finger.
7 Large degree of deflection in the opposite direction to as high a position as possible. Make the lower thread tension as weak as possible.
Use only bobbins which are specified by Brother
being pulled? TROUBLESHOOTING
Problem...the presser foot pressure. Set the bobbin so that there...
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