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M343D
Brother M343D Service Manual
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MODEL
:
Home Overlock Machine
SER
VICE MANUAL
Nov
.,2015
Dec.,2016
Published :
Revised :
c
2015 Brother Industries, Ltd.
All rights reserved.
CONFIDENTIAL
2104D/2104DA
V
M343D/4100D/SB3734T
2504D/1034DX
2
Table of Contents
Default Chapter
4
Table of Contents
4
1 Outline of Mechanism
6
Main Mechanisms
6
Driveline
6
Main Frame / Covers / Upper Thread Guide
12
2 Disassembly with Assembling Note
12
Disconnecting Cables and Removing Accessories
14
Clothplate Cover Assy
15
Front Cover Assy
16
Panel Plate L Assy
18
Rear Cover Assy
20
Spool Stand Base Assy
21
Thread Tension L Assy
23
Looper Thread Take-Up
27
Oil Pan
28
Lamp / Electrical Parts / Main Motor Unit
31
LED Assy / Motor L Assy
31
Presser Foot Unit
32
Presser Foot Adjusting Screw / Presser Foot Holder Assy / Presser Bar
33
Presser Lifter Shaft Assy
34
Upper Blade / Lower Blade / Looper
36
Needle Plate Assy / Stitch Width Dial Assy
36
Upper Knife Holder
37
Lower Knife Holder Assy
38
Over Looper L Assy
39
Lower Looper / Movable Needle Guard
40
UL Lever
41
Upper Knife Plate Assy
42
Upper Knife Lever / Upper Knife Arm / Feed Adjusting Cam
43
OL Link Plate / OL Lever
44
OL Eccentricity / UL Rod / UL Eccentricity
45
Feed Mechanism
47
Differential Adjusting Plate
47
Feed Bar Assy
48
Feed Rod
52
Feed Dial
53
Driving Mechanism
54
Hand Wheel Assy
55
Spiral Bevel Gears L / Looper Driving Shaft
57
Feed Adjusting Lever / Differential Adjusting Lever / Differential Dial Stand Assy
58
Needle Bar
61
Needle Bar Driving Lever Assy
63
3 Adjustment
65
Presser Bar Height Adjustment
66
Needle Bar Height Adjustment
67
Needle Bar Balance Position Adjustment
68
Lower Looper Position Adjustment
69
Lower Looper Timing Adjustment
70
Front / Back Position of Lower Looper Adjustment
71
Movable Needle Guard Position Adjustment
72
Fixed Needle Guard Position Adjustment
73
Over Looper Position Adjustment
74
Over Looper Timing Adjustment
75
Over Looper / Lower Looper Gap Adjustment
76
Feed Dog Height Adjustment (1)
77
Feed Dog Height Adjustment (2)
78
Feed Timing Adjustment
79
Thread Tension Adjustment
80
Thread Tension Release Adjustment
81
Stitch Width Dial Adjustment
82
Lower Knife / Upper Knife Position Adjustment
83
Motor Position Adjustment
84
Looper Take-Up Position Adjustment
85
Thread Take-Up Position Adjustment
86
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Brother M343D Specifications
General
Stitch Width
5.0 - 7.0 mm
Stitch Length
2.0 - 4.0 mm
Differential Feed
0.7 - 2.0
Free Arm
Yes
Rolled Hem
Yes
Number of Threads
3 or 4
Type
Overlock
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