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LH-4128-7
JUKI LH-4128-7 User Manual
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Direct-drive, High Speed, 2-Needle, Needle-feed, Lockstitch Machine
LH-4128
LH-4128-7/4168-7/4188-7
40038257
No.E367-03
ENGINEER’S MANUAL
®
Direct-drive, High Speed, 2-Needle, Needle-feed, Lockstitch Machine
with
Automatic Thread T
rimmer
2
Table of Contents
Table of Contents
3
Specifications
5
Name of each Component
6
Model Numbering Sysytem
7
LH-4128 (Without a Thread Trimmer)
7
LH-4128-7•LH-4168-7•LH-4188-7(With a Thread Trimmer)
8
Special Notes for Safe Operation
9
Standard Adjustment
12
Needle Bar and Feed Dog
12
Initial Position of the Needle Bar
12
Adjustment of the Right and Left Feed Dog Positions, Height, and Gradient
14
Needle Bar Height
16
Needle Clamp
18
Needle Entry
18
Timing between the Needle and the Hook
20
Lift of the Needle Bar
20
Clearance between the Needle and the Blade Point of the Hook
20
Position of the Needle and the Blade Point of the Hook
20
Initial Position of the Bobbin Case Opening Lever
22
Standard Adjusting Position for the Inner Hook Guide Arm Shaft
22
Clearance between the Throat Plate and the Bobbin Case Stopper
24
Relation between the Main Shaft and the Lower Shaft
26
Lubrication
28
Lubrication System
28
How to Clean the Filter Section
28
Hook Oil Amount
28
Oil in the Feed Box
30
Replacement of the Hook Shaft Oil Wick
30
Replenishing Grease to the Specified Places (for LH-4168-7, LH-4188-7 Only)
32
Forward and Reverse Stitch Pitches
36
Adjusting the Needle Stop Position
38
Needle-Up Stop Position of the Sewing Machine
38
Needle-Down Stop Position of the Sewing Machine
38
Disc Release Changeover for Lap Lifter
40
Needle Bar Stroke Adjustment (for LH-4168-7, LH-4188-7 Only)
42
Thread Trimming Device
44
Moving Knife Position
44
Adjusting the Height of the Counter Knife
44
Adjusting the Thread Presser Spring
46
Position of the Thread Trimming Cam and the Thread Trimming Timing
48
Clearance between the Thread Trimming Cam and the Thread Loosening Arm
48
Adjustment of Thread Tension Release
50
Wiper Components
52
Reverse Solenoid Position
52
Initial Position of the Reverse Feed Control Lever
54
Auto-Back
54
Assembling/Adjusting the Knee-Lifter Detecting Device
56
Assembling the Knee-Lifter Detection Sensor Plate (Asm.)
56
Assembling the Knee-Lifter Plate (Asm.)
56
Connecting the Cords
58
Adjusting the Knee-Lifter Detection Seat (Asm.)
58
Thread Take-Up Lever Guide Position
58
Separately Driven Needle Changeover Switch (for LH-4168-7, LH-4188-7 Only)
60
Gauge Replacing Procedure
61
Needle Feed/Bottom Feed Changeover
63
Replacing the Timing Belt
66
Installation/Removal of the Needle Bar Rocking Base
68
Sewing Specification
70
List of Gauge Components
71
Lh-4128F
73
Lh-4128-7
74
Lh-4168-7
75
Lh-4188-7
76
List of the Major Components
77
List of Expendable Parts
77
Other Renewal Parts
77
Troubles and Corrective Measures
78
Drawing of the Table
87
Other manuals for JUKI LH-4128-7
Brochure & Specs
8 pages
4
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JUKI LH-4128-7 Specifications
General
Brand
JUKI
Model
LH-4128-7
Category
Sewing Machine
Language
English
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