Troubleshooting - Singer 191D-20 Instruction Manual And Parts List

Problems
1. Needle is installed wrong
2. Wrong needle type or size
3. Needle is bended
Needle break
4. Wrong relation with rotary hook
5. Needle doesn't center the needle hole of throat plate
or presser foot
1. Low quality thread
2. Thread is thicker than needle hole
3. Wrong threading
4. Thread tension is too strong
Thread break
5. Needle is installed wrong
6. Thread stand installed wrong
7. Thread tension disc, thread guide, needle, hook point
and needle plate are burred
8. Wrong relation with rotary hook
1. Wrong relation of needle and hook point
2. Wrong threading
3. Needle is installed wrong
Skip stitches
4. Inadequate thread tension
5. Hook point is damaged
6. Needle is bended
1. Wrong threading
2. Thread is thicker than needle hole
Loosen stitches
3. Inadequate thread tension
4. Wrong setting of needle and hook point
1. Thread tension is too strong
2. Take-up spring is too strong
Wrinkled stitches 3. Inadequate pressure of presser foot
4. Inadequate height of feed dog
5. Needle is too thick

Troubleshooting

Possible Causes
High Speed Straight Lockstitch Sewing Machine
Possible Solutions
1. Install needle correctly
2. Use proper needle for fabric and thread
3. Replace needle
4. Readjust the rotary hook
5. Readjust the needle plate and presser foot
1. Change the thread
2. Use proper needle for fabric and thread
3. Rethreaded the machine correctly
4. Readjust the thread tension nut
5. Install needle correctly
6. Install thread stand correctly
7. Grind off, polish or replace by a new parts
8. Readjust needle and hook point relation
1. Readjust needle and hook point
2. Rethread the machine correctly
3. Installed needle correctly
4. Readjust the thread tension nut
5. Replace by a new part
6. Replace needle
1. Rethread the machine correctly
2. Use proper needle for fabric and thread
3. Readjust the thread tension nut
4. Readjust needle and hook point
1. Readjust the thread tension nut
2. Readjust the take-up spring
3. Readjust the presser foot pressure
4. Readjust the feed dog
5. Use proper needle for fabric and thread
| Instruction Manual and Parts List
22