JUKI MB-1373 - User Manual

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ENGLISH

INSTRUCTION MANUAL

Table of Contents

Other manuals for JUKI MB-1373

Engineer's Manual50 pages

Questions and Answers

C
Caleb OconnorSep 12, 2025
What causes the length of thread remaining on the wrong side of the fabric after thread trimming to vary on my JUKI MB-1373 Sewing Machine?
- J
  Jennifer YatesSep 12, 2025
  If the length of thread remaining on the wrong side of the fabric after thread trimming varies on your JUKI sewing machine, adjust the position of the moving knife when the machine completes stop-motion (10 to 11 mm). Also, adjust the amount of lift of the button clamp jaw lever to 8.5 to 9.5 mm. Refer to '2-(5) Height and pressure of the button clamp.'
S
Sara RamirezSep 13, 2025
Why doesn't the button clamp go up on my JUKI MB-1373 Sewing Machine?
- L
  Leah HallSep 14, 2025
  If the button clamp fails to go up on your JUKI sewing machine, it might be because the hook section of the button clamp lifting link has worn out, in which case you should replace the worn-out parts with new ones. Also, ensure that the lifting hook is properly adjusted by aligning the end face of the lifting plate with that of the lifting hook at the time of stop-motion. Finally, if the clearance between the stitch adjusting cam and the roller is too large, adjust the clearance to 0.8 mm.
T
tamara03Sep 15, 2025
Why does the driving pulley clutch slip on my JUKI MB-1373?
- C
  Curtis SloanSep 15, 2025
  If the driving pulley clutch slips on your JUKI sewing machine, it could be because the ball and needle driving pulley pressure applying lever have worn out, in which case you should replace the ball, needle driving pulley pressure applying lever and pulley insert with new ones. Also, check for a decrease in the clearance between the ball and needle driving pulley pressure applying lever and adjust the clearance to 0.3 to 0.6 mm.
R
Robert ShafferSep 18, 2025
Why is the pedal heavy when operated due to overheating of the driving pulley on my JUKI MB-1373?
- C
  Cassandra NguyenSep 18, 2025
  Increase the clearance between the ball and the needle driving pulley pressure applying lever.
J
Justin SanchezNov 19, 2025
Why is my JUKI MB-1373 thread breaking?
- E
  Edward WilsonNov 19, 2025
  Thread breakage in your JUKI Sewing Machine can occur for several reasons: * The looper might be catching the thread twice due to an improper longitudinal position of the yoke slide. Adjust the looper positioning finger cam back and forth so that the looper blade point passes the center of the thread triangle at the position of the 9th or 10th stitch. * The crosswise or lengthwise travel timing of the yoke slide might be improper. Refer to the table of the yoke slide timing for how to adjust the needle bar height; the yoke slide should start moving backward immediately after the looper blade point passes the thread triangle. * The thread tension applied by thread tension disc No. 1 might be too high. Decrease the tension to approximately 68.6 to 147 mN (approximately 7 to 15 g). * ...
M
Melissa BurgessNov 23, 2025
Why is my JUKI MB-1373 Sewing Machine producing faulty thread tension and leaving remaining thread?
- S
  Sara MartinNov 23, 2025
  Faulty thread tension and remaining thread on your JUKI sewing machine can be caused by several factors: * If the thread tension applied by thread tension disc No. 1 is too low, adjust the tension to approximately 68.6 to 147 mN (approximately 7 to 15 g). * If the floating timing of thread tension disc No. 2 is too early, refer to the table of the floating timing of thread tension disc No. 2 for how to adjust the needle bar height. * If the crosswise travel timing of the yoke slide is too late, refer to the table of the yoke slide timing for how to adjust the needle bar height. * If the needle entry point in the button is improper, adjust it so that the needle enters slightly behind the center of the holes in the button to prevent the needle's front face from contacting the button...

Summary

Preparation of the Sewing Machine

Installation

Details on how to install the sewing machine head on the table and attach components.

Lubrication

Instructions for applying oil and grease to various parts of the sewing machine.

Attaching the Needle

Procedure for correctly inserting and tightening the needle in the needle bar.

Threading the Machine

Step-by-step instructions for threading the sewing machine with thread.

Adjustment of the Sewing Machine

Thread Tension Adjustment

Details on adjusting thread tension using tension posts for optimal stitch formation.

Adjustment of the Thread Pull-Off Lever

How to adjust the thread pull-off lever for correct thread delivery during sewing.

Adjusting the Tension Lever

Adjusting the Nipper

Needle-to-Looper Relation

Steps to adjust the needle bar height and looper position for correct stitch formation.

Position of the Needle Guide

Height of the Button Clamp

Adjustment of the Button Clamp Stop Lever

Timing of Thread Tension Release

Setting for 2- or 4-Hole Buttons

Instructions for setting lengthwise and crosswise feed regulators for 2- or 4-hole buttons.

Setting a Number of Stitches

Adjusting the Position of the Stop-Motion

How to adjust the stop-motion cam and hook for precise machine stopping.

Automatic Thread Trimmer

Knot-Tying Mechanisms

Troubles and Corrective Measures

JUKI MB-1373 Specifications

General

Number of Needles	1
Stitch Type	Lock Stitch
Feed Mechanism	Drop Feed
Max Sewing Speed	1, 500 rpm
Lubrication	Automatic
Presser Foot Lift	10 mm
Type	Button Sewing Machine

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