White 734 - Troubleshooting and Remedies

PROBLEM
AND
REMEDIES
Trouble
Probable
Cause
Remedies
II Machine
Minds
Skipping
Stitch..
Upper
thr.ed
tension
too
loose.
Improper
threading.
lobbin
not
wound
evenly.
Pulling or holding
material.
Not
enough
tension
on upp.r
thread.
Poor
quality thread.
Needle
too
fIn.
tot
thread
being used.
Starting
with take-up
In incorrect
position.
Improper
setting
of
needle.
Bent
or
eye
of
needle
too
diem.
Sent
or blunt
needle.
Tension, too
tight.
Dull ne.die.
Stitch
length too
long.
Stitch
length
control
Ia set
at
other
than
Number
5,
Clean
and oil machin,
the
shuttle
area.
(Sea
page
39.)
Place
needle correctly.
(See
page
10.)
Replace
needle or
thr.ad
to conform
each
other.
(See
page
9.)
Place
a piper beneath
fabric, or
use
Hill Point
needle.
Tighten
upper
tension.
See threading
Instruction,
peg. 13.
Adjust
bobbin
winder.
(See
page
12)
Avoid
pulling
or
holding
material,
just
ride
it.
Increase
tension.
Try
different
thread.
Se. needle
and
threed chart.
page
9.
Refer
to
threading
instructions,
see
page 13, and
rethr.ed
machine.
L.ooin
upper
thread
tension.
Seepage
18.)
Always
start
sewing
with
takeup lever
in highest
position.
Refer
to needle
setting
instruction,
see
peg.1O.
Try
a new needle.
Discard all
blunt
or
bent
needles and
replace
with
new.
See
tension
adjustment,
page
18.
Change
needle.
Reduce
stitch length.
Set stitch length
control
at
Number
5
Remove
needle
plete
and
clean lint from
feed
dog.
Thread
or lint in raceway.
Bent
needle.
Needle placed
incorrectly
in
clamp.
Too fine
a
needie
for
thread
being
used.
Too stretchy
fabric.
Replace
with
new
needle.
(See page
10j
Irregular
.•‘r ‘‘.
Upper Thread
Bribing
.:,..
. Material
Puc.ring
Machine
noisy
•
material
wil
not
feed
In
atiitch
itltchlng.
Improperly
tttreeded.
Too
much
tendon.
If
your
machine
skips
stitches
only
on
certain
fabrics,
try
all
of the
procedures
on
the
previous
page
before
calling
a
repair-man.
Check
the
needle
plate
area, if
there
are
scratches
and
marks
around
the
needle
hole
opening,
your
machine
is
not
being
cleaned
properly.
Always
remove
the
needle
plate
and
clean the
feed
dogs
periodically,
Improper
and
lack of
cleaning
will
cause
an
accumulation
of
lint
which
hampers
the
feeding
mechanism,
this
in turn
will
cause
the
operator
to
impatiently
pull
or push
the
cloth
causing
the
needle
to bend
and
strike
the
plate,
toot
or
hook,
causing
a
slip
in
the timing
mechanism.
Continuous
striking
will
cause
defects
making
it
necessary
to call
a
serviceman,
Lint
In feed
dog.