SINGER W9951 User Manual
Page 24
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26
Trouble
Upper thread
breaking
Material
puckering
Probable Cause
Correction
Improperly threaded
Too much tension
Starting with take up
in incorrect position
Improper setting of
needle
Bent or eye of needle
too sharp
Bent or blunt needle
Refer to threading instructions see page No. 11
and rethread machine
Loosen
tension
on
upper
thread
by
turning
thread tension knob to lower number.
Always
start
sewing
with
take
up
lever
in
highest position
Refer to needle setting instruction see page No. 8
Try a new needle
Discard all blunt or bent needles and replace
with new
Tensions too tight
Dull needle
Stitch length too
long
See tension adjustment page No. 13 & 14.
Change needle
Reduce stitch length
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