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WHAT TO DO WHEN
4
CONDITION
CAUSE
HOW TO FIX
REFERENCE
5. Needle breaks.
1. Needle is hitting the
needle plate.
2. Needle is bent or worn.
3. Needle is hitting the
hook.
4. The fabric moves while
the needle is piercing it
or the needle zigzag
while in fabric.
5. Fabric is being pulled
too strongly while
sewing.
See mechanical adjustment
"Needle position".
Change the needle.
See mechanical adjustment
"Clearance between needle
and hook.
See mechanical adjustment
"Zigzag synchronisation".
Guide the fabric gently while
sewing.
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6. Noisy operation.
1. Backlash between
shuttle hook gear and
lower shaft gear is too
great.
2. Lower shaft gear is
loose.
3. Inappropriate belt
tension.
4. Not enough oil.
See mechanical adjustment
"Backlash (lower shaft gear)".
Eliminate the looseness.
See part removal and
replacement "Driving motor
(DC motor)".
Oil all moving parts.
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7. Deformation
pattern
1. Inappropriate feed
balance.
2. Inappropriate zigzag
synchronisation.
3. Upper thread tension is
too strong.
See mechanical adjustment
"Stretch stitch feed balance.
See mechanical adjustment
"Zigzag synchronisation".
See mechanical adjustment
"Needle thread tension".
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