A SERVICE OF

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4
Cause:
Remedy:
4.
Seam
is
not
uniform
Tension
out
of
adjustment.
Check
upper
and
lower
tensions.
Thread
too
thick,
knotty
or
hard.
Use
first-class
thread
only.
Bobbin
thread
wound
unevenly.
During
bobbin
winding,
do
not
hold
thread
in
hand,
but
pass
it
through
the
bobbin
tension
stud.
Kinks
appear
on
top
and
bottom
of
Thread
machine
properly
and
check
material,
both
tensions.
5.
Machine
feeds
irregularly
or
not
at
all
Lint
has
accumulated
between
tooth
Remove
needle
plate
and
clean
out
rows
of
feed
dog.
lint.
Feed
dog
dropped.
(Drop-feed
control
Flick
drop-feed
control
to
the
left.
is
at
right.)
6.
Machine
runs
with
difficulty
Thread
ends
in
hook
raceway.
Remove
thread
ends
and
put
a
drop
of
oil
into
hook
raceway.
7.
Fundamental
rules
Never
run
a
threaded
machine
unless
there
is
a
piece
of
fabric
under
the
sewing
foot.
If
you
have
to
leave
the machine,
even
for
a
short
while,
be
sure
to
switch
off
the
master
switch.
This
is
particularly
important
when
children
are
around.