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Sewing Machine
T-8420C
Brother T-8420C User Manual
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T-8420C, 8450C, 8720C, 8750C
1. NAMES OF MAJOR PARTS
1
1.
NAMES OF MAJOR P
ARTS
(1)
Bobbin
winder
(2)
Lifting
lever
(3)
Presser
foot
(4)
Knee
lifter
assembly
(5)
S
titch length dial
(6)
Reverse lever
(7)
Oil
gauge
window
(8)
Machine
pulley
(9)
Alarm display (semi dry
type)
(10)
Cotton stand
(1
1)
Stop lever (T-8450C, 8750C)
Safety devices
(12)
Thread take-up cover
(13)
Finger guard
(14) Belt
cover
2479B
9
11
Table of Contents
Default Chapter
3
Safety Instructions
3
Notes on Safety
4
Maintenance and Inspection
5
Warning Labels
6
Table of Contents
9
1 Names of Major Parts
10
2 Machine Specifications
11
3 Table and Motor
12
4 Installation
13
Installation
14
Cotton Stand
19
Lubrication
20
Checking the Machine Pulley Rotating Direction
22
Alarm Display (Semi Dry Type)
22
5 Preparation before Sewing
23
Installing the Needle
23
Removing the Bobbin
24
Winding the Lower Thread
25
Installing the Bobbin
26
Threading the Upper Thread
28
Adjusting the Stitch Length
30
Using the Knee Lifter
30
Corner Sewing Method (T-8450C, 8750C)
31
To Stop the Needle Bars (Right and Left)
31
Number of Stitches: Quick-Reference Guide
31
6 Sewing
32
Backtacking
32
Sewing Condensed Stitches
33
7 Thread Tension
34
Adjusting the Thread Tension
34
Adjusting the Presser Foot Pressure
35
Adjusting the Presser Foot Floating Amount (Minute Lifting Amount)
36
Adjusting the Thread Take-Up Amount
37
8 Cleaning
38
Daily Cleaning Procedures
38
Lubricating Via the Oil Cover (Every 6 Months)
39
Draining Lubricating Oil
39
Applying Grease - When the GREASE Indicator Illuminates (Semi Dry Type)
40
Resetting the Cumulative Operating Time
42
9 Adjusting the Rotary Hook Lubrication Amount
43
10 Standard Adjustment
44
Thread Take-Up Amount for Thread Take-Up Spring
44
Thread Take-Up Spring Tension
45
Clearance between Rotary Hook and Needle Plate
46
Clearance between Rotary Hook and Opener
47
Presser Foot Height
47
Needle and Rotary Hook Timing
48
Installing the Feed Dog
50
Feed Dog Position
51
Feed Dog Height
52
Feed Dog Angle
53
11 Troubleshooting
54
Instruction Manual
58
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Brother T-8420C Specifications
General
Brand
Brother
Model
T-8420C
Category
Sewing Machine
Language
English
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