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What to Do When
PERFORMANCE
PROBLEMS
CHART
PROBLEM
PROBABLE
CAUSE
CORRECTION
Irregular Stitches
Incorrect size needle
Improper threading.
Loose upper thread tensson,
Pulling fabnc.
Loose presser foot
Unevenly wound bobbin.
Nicks or burrs at hote of needle plate.
Choose correct size needle for thread and fabnc,
Rethread machine.
Tighten upper thread tension.
Do not pull fabric; guide it gently_
Reset presser foot.
Rewind bobbin,
Replace needle plate, or polish off burrs completefy.
Pulling fabnc.
Do not pul! tabnc; guide it gently.
Breaking Needle
Incorrect size needle.
Choose correct size needle for thread and fabric,
incorrect setting of needle.
Reset needle°
Loose presser foot.
Reset presser foot.
Bunching of Thread
Upper and lower threads not drawn back
When starting a seam be sure to draw both threads under and
under presser foot before starting seam.
back of presser foot about 4'" and hold until a few 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 s_ze and kind.
Puckering
Bent or blunt needle.
Insert new needle.
Loose presser foot,
Reset presser foot.
Fabric too sheer or too soft.
Use underlay ot tissue paper.
Incorrect s_ze needle.
Choose correct size needle for thread and Iabnc
Skipping Stitches
Bent or blunt needle.
Insert new needle.
Incorrect setting of needle.
Reset needle.
Tight upper thread tension.
Loosen upper thread tension.
Starting to stitch too fast.
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 needle for thread and fabnc,
Sharp eye _nneedte.
Insert new needle.
Nicks or burrs at hole of needle plate,
Replace needle plate, or polish off burrs completely.
Breaking Bobbin Thread
Improper bobbin threading.
Check bobbln threading,
Lint in bobbin holder or hook race.
Clean bobbin holder and hook race.
The feed dog Js not in the upper position.
Raise the feed dog with the drop lever.
Stitch Length set at 0.
Adiust Stitch Length Control
Fabric not Moving
Thread knotted under fabnc.
Place both threads back under presser foot beiore beginning
to stitch.
Push-pull clutch Is disengaged.
Push _n the clutch.
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.
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