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