CONDITION
CAUSE
HOW TO FIX
REFERENCE
5. Breaking
thread
6. Stitches
are not
balanced.
7. Needle
breaks.
8. Puckering
1. Threading order is wrong.
2. Tip of the upper looper or lower
looper is dull or worn.
3. Needle is not attached properly.
4. Position of the looper thread
guide is off.
5. When beginning sewing, both the
needle thread and the looper
thread are not being pulled under
the presser foot.
6. Threads are jamming in the
thread path.
7. Needle eye is worn.
8. Quality of the thread is low.
9. Needle is hilling the needle plate,
upper or lower looper.
I. Position of the looper thread
guide is off.
2. Quality of the thread is low.
3. Telescoping thread guide bar
thread guide is not directly over
the spool.
1. Needle in not attached properly.
2. Fabric is being pulled too hard
while sewing.
3. The needle rubs against front
needle guard too much.
4. Needle is hitting the lower looper
too
much.
5. Needle is hilling the upper looper
too much.
6. Improper clearance between the
needle and needle guard.
7. Feed dog liming is off.
1. Position of the looper thread
guide is off.
2. Needle plate is not correct one for
current sewing operation.
3. Feed dog liming is off.
4. Presser foot pressure is too
strong.
5. Differential feed mechanism is
not functioning correctly.
Thread the lower looper, upper looper, right
side, and needle. Then left side needle.
Replace the upper or lower looper.
Re-set the needle
Adjust the looper thread guide position.
Pull both threads under the presser foot.
Check the threading and fix jamming.
Replace the needle.
Use high quality sewing thread.
Replace the needle or adjust clearance.
Adjust the looper thread guide position.
Use high quality sewing thread.
Center the thread guide over the spool.
Re-set the needle
Pull the fabrics gently during sewing.
Adjust the clearance between the needle
and lower looper.
Adjust the clearance between the needle
and lower looper.
Adjust the clearance between the needle
and upper looper.
Adjust clearance between the needle and
needle guard.
Adjust feed dog timing.
Adjust the looper thread guide position.
Replace the needle plate.
Adjust the feed dog timing.
Adjust the pressure with the pressure
adjusting screw
Adjust the differential feed ratio.
P 29
P 19, 20,
21, 26
P 29
P 19, 20
P 19, 20
P 26
P 19, 20,
21
P 16
P 29
P 16
4
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