Trouble Shooting - Pfaff Coverlock 3.0 Owner's Manual

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.