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SECTION 4. PERFORMANCE PROBLEMS CHART
PROBLEM PROBABLE CAUSE CORRECTION
Skipping Stitches
Breaking Upper Thread
Breaking Bobbin Thread
Fabric not Moving
Machine Jamming Knocking Noise
incorrect size needle,
Bent or blunt needle.
incorrect setting of needle.
Tight upper thread tension.
Starting to stitch too fast.
Improper threading.
Tight upper thread tension.
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs at hole of needle plate+
Improper bobbin case threading.
Lint in bobbin holder or hook race.
Darning plate in place.
Stitch Length set at 0+
Thread knotted under fabric.
Push-pull clutch is disengaged.
Thread caught in hook race.
Lint in bobbin case or shuttle.
Choose correct s+ze needle tot thread and fabric.
Insert new needle.
Reset needle.
Loosen upper thread tension.
Start to stitch at a medium speed.
Rethread machine.
Loosen upper thread tension.
Choose correct size needle for thread and fabric.
Insert new needle.
Replace needle ptate, or polish off burrs completely.
Check bobbin case threading.
Clean bobbin case and shuttle+
Remove darning plate.
Adjust Stitch Length Control.
PLace both threads back under presser foot before beginning
to stitch.
Push in the clutch.
Disassemble and clean hook race,
Clean bobbin holder and hook race.
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