5 – MACHINE MAINTENANCE 41
TROUBLE SHOOTING
Problem Solution
Fabric Does Not Feed Well Lengthen stitch length.•
Increase presser foot pressure for heavyweight fabric.•
Decrease presser foot pressure for lightweight fabric.•
Check the differential feed.•
Needle Breaks Insert needle correctly.•
Do not pull fabric while sewing.•
Tighten needle set screw.•
Use a larger size needle on heavy fabrics.•
Thread Breaks Check threading.•
Check for tangled or caught thread.•
Insert needle correctly.•
Insert new needle, current needle may be bent or have a blunt point.•
Use high quality thread.•
Loosen thread tension.•
Skipped Stitches 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.•
Use a high quality thread.•
Irregular Stitches Balance thread tension.•
Check for tangled or caught thread.•
Check threading.•
Fabric Puckers Loosen thread tension.•
Check for tangled or caught thread.•
Use high quality lightweight thread.•
Shorten stitch length.•
Decrease presser foot pressure for lightweight fabrics.•
Check the differential feed.•
Irregular Trimming Check alignment of cutters.•
Replace one or both cutters.•
Fabric Jams Check for tangled or caught thread.•
Compress thick layers of fabric with conventional machine before •
sewing with overlock.
Machine Does Not Operate Connect machine to power source correctly.•
