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What to Do When
PERFORMANCE PROBLEMS CHART
PROBLEM PROBABLE CAUSE CORRECTION
Irregular Stitches
incorrect size needfe
improper threading.
Loose upper thread tension.
Pulling fabric.
Loose presser toot
Uneventy wound bobbin.
Nicks or burrs at hole ot needle plate.
Choose correct size needle for thread and fabric.
Rethread machine.
Tighten upper thread tension.
Do not pull fabric; guLde Jtgently.
Reset presser |oot.
Rewind bobbin.
Replace needle plate, or polish off burrs completely.
Pulling tabnc. Do not pull fabric; guide it gentJy.
Breaking Needie Incorrect s_ze needle. Choose correct size needle tot thread and fabric.
Incorrect setting of needle. Reset needle.
Loose presser toot. Reset presser loot.
Bunching of Thread Upper and lower threads not drawn back When starting a seam be sure to draw both threads under and
under presser loot betore starting seam. back ot presser foot about 4"" and hold until a tow stitches are formed.
Incorrect thread tension. Reset thread tension.
Using two different sizes or kinds of thread. Upper thread and bobbin thread should be same size and kind.
Puckering Bent or blunt needle. Insert new needle.
Loose presser loot. Reset presser toot.
Fabric too sheer or too soft. Use undeday of tissue paper.
Incorrect s_ze needle. Choose correct s=ze needle for thread and fabnc
Skipping Stitches Bent or biunt needle. Insert new needle.
Incorrect setting ot needle. Reset needle.
Tight upper thread tension. Loosen upper thread tension.
Starting to stitch too tasL Start to stitch at a medium speed.
Improper threading. Rethread machine.
Breaking Upper Thread Tight upper thread tension. Loosen upper thread tension.
Incorrect size needle. Choose correct size needte tot thread and tabnc.
Sharp eye Jnneed}e. Insert new needle.
Nicks or burrs at hole ol needle plate. Replace needle plate, or polish off burrs completely.
Breaking Bobbin Thread Improper bobbin threading. Check bobbin threading.
Lint in bobbin holder or hook race. Clean bobbin holder and hook race.
The teed dog is not in the upper position. Raise the teed dog with the drop fever.
Stitch Length set at O. Adjust Stitch Length Control
Fabnc not Moving Thread knotted under fabnc. P_ace both threads back under presser toot betore beg_nn=ng
to stitch.
Push-pull clutch is disengaged. Push in the ctutch.
Machine Jamming Knocking No_se Thread caught in hook race. Disassemble and clean hook race.
Lint in bobbin holder or hook race. Clean bobbin holder and hook race.
I o7
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