Troubleshooting - Singer 321C 133M-04 / TF Instruction Manual And Parts List

Problems
1. Needle installed the wrong way.
2. Wrong kind of needle.
3. Damaged needle.
Broken needle
4. Wrong relation with needle guards.
5. Wrong relation with looper.
6. Needle is not centralized with the hole at the needle
plate or the presser foot.
1. Low quality thread.
2. Thread is thicker than the eye of the needle.
3. Wrong passage of thread.
4. Thread tension too tight.
5. Needle wrongly set.
Broken thread
6. Thread stand wrongly set.
7. Needle overheating.
8. Tension disk or guides with burrs .
9. Wrong relation of needle with looper .
10. Needle, looper, needle plate and guides have burrs.
1. Wrong relation of needle with looper.
2. Wrong passage of thread.
3. Needle installed the wrong way.
Failure in stitches
4. Inadequate tension of thread.
5. Point of looper damaged.
6. Needle damaged.
7. Wrong installation of needle guards.
1. Wrong threading.
2. Thread is thicker than needle hole.
Skip stitches
3. Wrong thread tension.
4. Needle thread is not lubricated.
5. Wrong relation of needle with looper.
From the library of: Superior Sewing Machine & Supply LLC

Troubleshooting

Possible Causes
High Speed Overlock Machine
Possible Solutions
1. Install the needle correctly.
2. Use needle adequate for cloth and thread.
3. Replace for a new one.
4. Adjust needle guards.
5. Adjust the looper.
6. Adjust the needle plate or the presser foot.
1. Use good quality thread.
2. Use adequate needle to cloth and thread.
3. Pass thread correctly.
4. Adjust the thread tension unit.
5. Set needle correctly.
6. Set the thread stand correctly.
7. Fill in silicon oil or adjust needle guards.
8. Replace the parts.
9. Adjust the synchronism of needle and looper.
10. Replace the part.
1. Adjust the relation of needle with looper.
2. Pass thread correctly.
3. Install needle correctly.
4. Adjust thread tension button.
5. Replace the part.
6. Replace for a new needle.
7. Adjust the needle cover.
1. Pass thread correctly.
2. Use proper needle hole for cloth and thread.
3. Adjust the thread tension units.
4. Fill in the silicon oil.
5. Adjust the needle and looper.
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