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JUKI LBH-784 - Stitching Troubles Caused by Other Reasons

JUKI LBH-784
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29.
STITCH'NG
TROUBLLS
CAUSED
BY
OTHER
REASONS
Trouble
Cause
Remedy
Page
1.
Starting
pedal
does
not
work.
(The
work
clamp
arm
is
not
lifted
up
fully.)
(1)
Needle
plate,
needle
plate
base
or
bobbin
thread
trimmer
is
clogged
with
fibrous
dust.
(2)
The
needle
thread
trimmer
is
interfered
by
the
work
clamp
check
or
the
trimmer
driving
plate.
0
Tilt
the
machine
head
and
clean
them
up.
o
Readjust
the
installation
of
the
trimmer,
or
the
position
of
the
trimmer
driving
plate.
8
2.
Machine
does
not
reach
the
high
speed
even
when
the
pedal
is
stepped
down
fully.
(1)
The
hand
stop
crank
is
not
in
the
correct
position.
(2)
The
belt
shifter
of
the
speed
transmitter
has
not
changed
to
the
high
speed
pulley.
o
Correct
the
position
of
the
hand
stop
crank.
o
Lubricate
the
shifter
driving
pin.
1
3.
A
loud
noise
is
produced
with
a
stop-motion,
or
sewing
speed
does
not
lower
at
the
end
of
sewing.
(1)
Improper
setting
of
the
low
speed
cam
for
small
numbers
of
stitches.
(2)
The
flat
belt
is
too
loose.
(3)
The
low
speed
V
belt
is
too
loose.
o
Readjust
the
setting
of
the
low
speed
cam.
o
Increase
the
belt
tension
by
the
tension
pulley.
o
Increase
the
tension
of
the
V
belt
by
the
motor.
6
2
1
4.
Stop-motion
is
not
smooth.
(1)
Stop-motion
lever
needs
lubrication.
(2)
The
belt
shifter of
the
speed
transmitter
has
not
changed to
the
low speed pulley.
o
Lubricate
the
stop-motion
lever,
o
Readjust
the
position
of
the
belt
shifter.
3
7
5.
The
machine
does
not
lubricate.
(1)
Oil
level
in
the
oil
reservoir
is
too
low.
(2)
Oil
is
not
circulated.
O Fill
the
lubricating
oil
up
to
"HIGH"
mark.
o
Apply
oil
to
the
oil
return
felts.
3
3
6.
Knife
is
dropped
during
high
speed
rotation.
(1)
Position
of
the
knife
tripping
segment
is
not
correct.
(2)
The
setting
of
the
low
speed
cam
for
numbers
of
stitches
is
not
correct.
o
Adjust
the
position
of
the
driving
cam
so
that
the
knife
is
dropped
down
at
a
delayed
timing.
o
Correct
the
setting
of
the
low
speed
cam.
8
6
7. Knife is
dropped
1 even if the needle
thread
is
broken.
(1)
The
machine is
threaded
incorrectly.
o
Correct
the
threading.
•
8.
Needle
is
broken.
(1)
The
needle
is
bent.
(2)
The
needle
and
the
hook
blade
touch
with
each
other.
(3)
Needle
thread
trimmer
hits
the
needle
when
opening
its
blades.
o
Replace
the
needle,
o
Readjust
the
positions
of
the
needle
and
the
sewing
hook,
o
Readjust
the
position
of
the
trimmer,
o
Adjust
so
that
the
limiting
plate
and
the
blocking
arm
touch
each
other
at
the
time
of
starting.
3
7
8
8
From the library of: Superior Sewing Machine & Supply LLC

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