Trouble Cause Remedy
1.
Starting pedal does not (1) Needle plate needle plate base 0 Tilt the machine head and clean
work. (The work clamp
or
bobbin thread trimmer is
them
up.
arm is not lifted up fully)
clogged with fibrous dust.
0 Readjust the
in
stallation
of
the
(2)
The
needle thread trimmer
is
the work clamp check
or
the
trimmer
or
the position
of
the
trimmer interfered by driving
trimmer driving plate.
plate.
2. Machine does not reach ( 1) The hand stop crank is not
in
0 Correct the position
of
the hand
the high speed even when the correct position. stop
crank.
the pedal is stepped
down
(2)
The
belt shifter
of
the speed 0 Lubricate the shifter driving pin.
fully. transmitter bas not changed to
the high speed pulley.
3. A lond noise is produced
(I)
Improper setting
of
the low 0 Readjust the setting
of
the low
with a stop-motion,
or
speed cam for snall numbers
speed cam
sewing speed does not
of
stitches.
0 Increase the belt tension by the
lower
at
the end
of
sewing. (2)
The
flat belt
is
too loose.
tension pulley.
(3) The low speed V belt is too
0 Increase the tension
of
the V belt
loose.
by the motor.
4. Stop-motion is not
(I)
Stop-motion lever needs 0 Lubricate the stop-motion lever
smooth. lubrication. 0 Readjust the position
of
the belt
(2)
The
belt shifter
of
the speed shifter.
transmitter has not changed to
the low speed pulle
y.
5.
The
machine does not (1) Oil level
in
the oil reservoir is 0 Fill the lubricating oil up to
lubricate.
too low. "HIGH" mark.
(2) Oil is not circulated.
0 Apply oil to the oil return felts.
6.
Knife is dropped during (1) Position
of
the knife tripping 0 Adjust the position
of
the driving
high speed rotation.
segment is not correct.
cam so that the knife is dropped
(2)
The
setting
of
the low speed
down at a delayed timing.
cam for numbers
of
stitches is
o Correct the setting of the low
not correct.
speed
cam.
7. Knife is dropped even
if
(
1)
T
he
machine is threaded 0 Con·ect the threading.
the needle thread is broken.
incorrectly.
8. Needle
is
broken.
(1
) T
he
needle is bent
0 Re
plac
e
th
e n
ee
dl
e.
(2)
The
needle and the book blade
0
Re
a
dju
st
th
e
po
s
iti
ons
of
th
e needle
and
the
sewing
ho
ok.
touch w.
ith
each other.
0 Readjust
th
e
po
s
ition
of
th
e trimme
r.
(3) Needle thread trimmer hits the
0
Adju
st so
that
the
limiting
pl
ate
and
needle when opening its blades.
the
blocking arm
touch
each
other at
th
e
Lim
e
of
starting.
From the library of: Superior Sewing Machine & Supply LLC
To Next Page
Loading...
