7.
Troubleshooting
When trouble occurs when operating the machine, refer
to
the
following
table for selecting suitable measures:
Trouble
Needle thread breaks
Looper thread breaks
No
chaining on fabric end
Thread skips
Cause
1.
Damaged looper
2. Needle thread too tight
3. Worn our feed dog causing
fine
stitches
4. Thread twisting or entangling between
thread stand and needle
5. Improper needle setting;
Bent or damaged needle
6. Needle thread too loose
1.
Looper thread too tight or too loose
2. Damaged looper
3. Thread twisting or entangling between
thread stand and looper
1. Incorrect threading
2. Looper thread too tight
3. Improper timing of needle and looper
4. Presser foot screw loosened
1.
Needle setting not correct;
Bent or damaged needle
2. Needle thread regulator
set
too
low
3. Needle thread sticking on needle due
to
heat
4. Needle bar
set
too high
5. Needle thread pinched by needle guard,
collapsing loop
6. Looper thread too loose, not marking a
good triangle
Needle or looper breaks
1.
Improper timing of needle and looper
2. Bent needle
Nonuniform stitch length;
1.
Weak pressure of needle and looper
seam not straight 2. Bent needle
3. Worn out feed dog
11
Replace looper
Reduce tension
Replace feed dog
Cure
Secure correct threading
Set needle properly
Replace needle
Increase tension
Adjust tension
Replace looper
Check for correct threading
Thread machine correctly
Reduce tension
Adjust timing of needle and looper
Tighten the screw
Set needle correctly
Replace needle
Raise regulator
Use lubricant on thread
Lower needle bar
Lower needle guard slightly
Increase looper thread tension
Adjust timing of needle and looper
Replace needle
Increase pressure
Replace needle
Replace feed dog
From the Library of Superior Sewing Machine & Supply LLC
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