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4
CAUSE OF TROUBLES AND TROUBLESHOOTING
1) Sewing machine troubleshooting
No Symptom Checkpoints Root cause Corrective action
1
2
Needle breaks
Needle
Height of needle
Threading method
Needle
Upper thread tension
Lower thread tension
Needle
Threading
Height of needle bar
Needle is bent
Bad timing of feed dog
Bad timing of needle and hook
Wrong threading
Bent needle or broken needle tip
Too tight upper thread tension
Too loose lower thread tension
Bent needle or broken needle tip
Thread passing at wrong position
Wrong timing of needle and hook
Needle is inserted into wrong
position
Bad timing of needle and hook
Needle inserted in the wrong
position
Needle inserted into wrong position
Wrong timing of needle and hook
Wrong timing of needle and hook
Loose upper thread
Bad timing of needle and hook
Direction and height
of needle
Operating capacity of
take-up lever spring
Direction and height
of needle
Ascending level of
needle bar
Gap between needle
and hook
Ascending level of
needle bar
Gap between needle
and hook
Direction and height
of needle
Change the needle
Adjust the timing of feed dog
Adjust the timing of needle and hook
Thread the needle correctly
Change the needle
Reduce tension of upper thread
Reduce tension of lower thread
Change the needle
Thread the needle correctly
Adjust the timing of needle and hook
Reinsert the needle correctly
Adjust the timing of needle and hook
Adjust the timing of needle and hook
Insert the needle correctly
Reinsert the needle in the right
direction
Adjust the timing of needle and hook
Adjust the timing of needle and hook
Adjust take-up lever spring
Thread breaks
3
Stitch skips
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