Trouble shooting
Problem
Fabric does not feed well
Needle breaks
Thread breaks
Irregular stitches
Fabric puckers
Irregular trimming
Fabric jams
Machine does not operate
38
Maintenance
Solution
- Lengthen stitch length.
- Increase presser foot pressure for heavyweight fabric.
- Decrease presser foot pressure for lightweight fabric.
- Check the differential feed.
- Insert needle correctly.
- Do not pull fabric while sewing.
- Tighten needle set screw.
- Use a larger size needle on heavy fabrics.
- Check threading.
- Check for tangled or caught thread.
- Insert needle correctly.
- Insert new needle, current needle may be bent or have a blunt point.
- Loosen thread tension.
- Insert new needle, current needle may be bent or have a blunt point.
- Tighten needle set screw.
- Insert needle correctly.
- Change type or size of needle.
- Check threading.
- Increase presser foot pressure.
- Balance thread tension.
- Check for tangled or caught thread.
- Check threading.
- Loosen thread tension.
- Check for tangled or caught thread.
- Decrease presser foot pressure for lightweight fabrics.
- Check the differential feed.
- Check alignment of cutters.
- Replace one or both cutters.
- Check for tangled or caught thread.
- Compress thick layers of fabric with conventional machine before sewing
with overlock.
- Connect machine to power source correctly.