SINGER 191D-30 - Manual (Page 25)

22 High Speed Straight Lockstitch Sewing Machine | Instruction Manual and Parts List
Troubleshooting
Problems Possible Causes Possible Solutions
Needle break
1. Needle is installed wrong 1. Install needle correctly
2. Wrong needle type or size 2. Use proper needle for fabric and thread
3. Needle is bended 3. Replace needle
4. Wrong relation with rotary hook 4. Readjust the rotary hook
5. Needle doesn’t center the needle hole of throat plate
or presser foot
5. Readjust the needle plate and presser foot
Thread break
1. Low quality thread 1. Change the thread
2. Thread is thicker than needle hole 2. Use proper needle for fabric and thread
3. Wrong threading 3. Rethreaded the machine correctly
4. Thread tension is too strong 4. Readjust the thread tension nut
5. Needle is installed wrong 5. Install needle correctly
6. Thread stand installed wrong 6. Install thread stand correctly
7. Thread tension disc, thread guide, needle, hook point
and needle plate are burred
7. Grind off, polish or replace by a new parts
8. Wrong relation with rotary hook 8. Readjust needle and hook point relation
Skip stitches
1. Wrong relation of needle and hook point 1. Readjust needle and hook point
2. Wrong threading 2. Rethread the machine correctly
3. Needle is installed wrong 3. Installed needle correctly
4. Inadequate thread tension 4. Readjust the thread tension nut
5. Hook point is damaged 5. Replace by a new part
6. Needle is bended 6. Replace needle
Loosen stitches
1. Wrong threading 1. Rethread the machine correctly
2. Thread is thicker than needle hole 2. Use proper needle for fabric and thread
3. Inadequate thread tension 3. Readjust the thread tension nut
4. Wrong setting of needle and hook point 4. Readjust needle and hook point
Wrinkled stitches
1. Thread tension is too strong 1. Readjust the thread tension nut
2. Take-up spring is too strong 2. Readjust the take-up spring
3. Inadequate pressure of presser foot 3. Readjust the presser foot pressure
4. Inadequate height of feed dog 4. Readjust the feed dog
5. Needle is too thick 5. Use proper needle for fabric and thread