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Hook
raceway
is
jammed
with
thread
or
needs
oiling.
Burrs
or
sharp
edges
on
needle
plate
slot.
3.
Needle
Breaks
Ca
use:
Bent
needle
strikes
point
of
sewing
hook.
Needle
too
thin
or
thread
too
heavy.
Fabric
pulls
needle
so
it
bends
and
strikes
needle
plate.
Bobbin
case
inserted
incorrectly.
4.
Faulty
Stitch
Formation
Cause:
Improper
tension.
Thread
too
heavy,
knotty
or
hard.
Bobbin
unevenly
wound.
Pieces
of
thread
between
tension
discs.
Clean
and
oil
hook
raceway.
Polish
needle
plate
slot
with
fine
emery
cloth.
Remedy:
Replace
needle
at
once
to
prevent
further
damage.
Use
correct
needle
and
thread
sizes.
Don’t
force
the
feeding
motion.
Guide
the
material
lightly.
Push
bobbin
case
until
you
hear
it
snap
into
place.
Remedy:
Adjust
tensions
as
instructed.
Use
only
first-rate
thread
—
the
correct
size
for
the
needle
and
fabric.
Don’t
run
thread
over
finger
when
winding
the
bobbin,
but
lead
it
around
thread
retainer
stud
on
top
cover
and
through
thread
guide.
Raise
presser
bar
lifter
and
remove
thread.
30
il[.