Causes
Make sure you have threaded the machine correctly.
- Look for any knots in the thread, especially in the bobbin case. Knots will stop the machine from working.
- Rethread the machine. The thread take up lever should be in the highest position and then attach the spool of thread. Pull the thread through the needle tension discs, then through the needle, leaving a long tail of thread.
The thread tension needs to be adjusted depending on the weight of the fabric and the thread.
- Adjust the upper thread tension to ensure it is balanced with the bobbin thread.
- Rethread the machine, making sure the thread is seated correctly in the tension disks and threading path.
- Make sure the bobbin is inserted properly and wound evenly.
- If the problem continues, you may want to change the type or weight of the thread you are using.
Feed dogs may get jammed when thread snags or debris accumulates.
- Turn off the machine, and remove the needle and presser foot.
- Carefully clean the feed dog area by removing any lint or thread.
- Manually move the feed dogs up and down to ensure they are working properly.
- Reassemble the needle and presser foot, turn on the machine, and test it without fabric to ensure the feed dogs function correctly.
The needle may be damaged, bent, or dull, which is dangerous.
- Check to see if the needle needs to be replaced.
- Turn off the machine, loosen the needle clamp screw, take out the damaged needle
- Insert the new needle with the flat edge to the back of the sewing machine. Ensure it is placed as high as possible, tighten the needle clamp screw.
- Make sure the needle is straight. Manually turn the hand wheel to ensure the needle moves freely.
- Turn on the machine and test it.
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