5 troubleshooting, Troubleshooting – SINGER 321D-241M-24 INDUSTRIAL SERGER User Manual
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Troubleshooting
18
Ultra High Speed Overedge and Safety Stitch Machine
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Instruction Manual and Parts List
Problems
Possible Causes
Possible Solutions
Broken needle
1. Needle installed the wrong way.
1. Install the needle correctly.
2. Wrong kind of needle.
2. Use needle adequate for cloth and thread.
3. Damaged needle.
3. Replace for a new one.
4. Wrong relation with needle guards.
4. Adjust needle guards.
5. Wrong relation with looper.
5. Adjust the looper.
6. Needle is not centralized with the hole at the needle
plate or the presser foot.
6. Adjust the needle plate or the presser foot.
Broken thread
1. Low quality thread.
1. Use good quality thread.
2. Thread is thicker than the eye of the needle.
2. Use adequate needle to cloth and thread.
3. Wrong passage of thread.
3. Pass thread correctly.
4. Thread tension too tight.
4. Adjust the thread tension unit.
5. Needle wrongly set.
5. Set needle correctly.
6. Thread stand wrongly set.
6. Set the thread stand correctly.
7. Needle overheating.
7. Fill in silicon oil or adjust needle guards.
8. Tension disk or guides with burrs .
8. Replace the parts.
9. Wrong relation of needle with looper .
9. Adjust the synchronism of needle and looper.
10. Needle, looper, needle plate and guides have burrs. 10. Replace the part.
Skip stitches
1. Wrong relation of needle with looper.
1. Adjust the relation of needle with looper.
2. Wrong passage of thread.
2. Pass thread correctly.
3. Needle installed the wrong way.
3. Install needle correctly.
4. Inadequate tension of thread.
4. Adjust thread tension button.
5. Point of looper damaged.
5. Replace the part.
6. Needle damaged.
6. Replace for a new needle.
7. Wrong installation of needle guards.
7. Adjust the needle cover.
Failure in stitches
1. Wrong threading.
1. Pass thread correctly.
2. Thread is thicker than needle hole.
2. Use proper needle hole for cloth and thread.
3. Wrong thread tension.
3. Adjust the thread tension units.
4. Needle thread is not lubricated.
4. Fill in the silicon oil.
5. Wrong relation of needle with looper.
5. Adjust the needle and looper.