Condition Cause How to fix Reference
6. Noisy 1. Backlash between shuttle See mechanical adjustment p.18
operation hook gear and lower shaft “backlash (lower shaft gear)”.
gear is too great.
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See mechanical adjustment p.28
“motor belt tension”.
4. Not enough oil. Oil all moving parts.
5. Upper shaft is loose. Eliminate the looseness.
7. Deformed 1. Inappropriate feed balance. See mechanical adjustment p.13
pattern “stretch stitch balance”.
2. Inappropriate zigzag See mechanical adjustment p.27
synchronization. “needle synchronization”.
3. Upper thread tension is too See mechanical adjustment p.10
strong. “top tension”.
3
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