SECTION 4. PERFORMANCE PROBLEMS CHART
What to Do When
PROBLEM PROBABLE CAUSE CORRECTION
Incorrect size needle, Choose correct size needle for thread and fabric,
Improper threading, Rethread machine,
Loose upper thread tension. Tighten upper thread tension.
Irregular Stitches Pulling fabric. Do not pull fabric; guide it gently.
Loose presser foot, Reset presser foot.
Unevenly wound bobbin, Rewind bobbin.
Nicks or burrs at hole of needle plate. Replace needle plate, or polish off burrs completely.
Pulling fabric. Do not pull fabric; guide it gently.
Incorrect size needle. Choose correct size needle for thread and fabric.
Breaking Needle Incorrect setting of needle. Reset needle.
Loose presser foot. Reset presser foot.
Upper and lower threads not drawn back When starting a seam be sure to draw both threads under and
Bunching of Thread under presser foot before starting seam. back of presser foot about 4" and hold until a few stitchs are
formed.
Puckering
Incorrect thread tension(s).
Using two different sizes or kinds of thread.
Bent or blunt needle.
Loose presserfoot.
Fabric very sheer or very soft.
Reset thread tension(s).
Upper thread and bobbin thread should be same size and kind,
Insert new needle.
Reset presser foot.
Use underlay of tissue paper.
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