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PROBLEM CAUSE REMEDY REFERENCE
6. Noisy 1. Backlash between shuttle hook See mechanical adjustment P. 14
operation gear and lower shaft gear is “Clearance between needle and
too great. hook (NO. 2).”
2. Lower shaft gear is loose. Eliminate the looseness.
3. Inappropriate belt tension. See mechanical adjustment P. 22
“Motor belt tension.”
4. Upper shaft gear is loose. Eliminate the looseness.
5. Not enough oil. Oil all moving parts.
7. Deformation of 1. Inappropriate zigzag See mechanical adjustment P. 11
pattern synchronization. “Needle swing.”
2. Inappropriate disengagement See mechanical adjustment P. 21
of cam follower. “disengagement of cam follower.”
3. Upper thread tension is too Adjust upper thread tension P. 8
strong. correctly.
4. Inappropriate feed balance See mechanical adjustment P. 19
BALANCE "Feed balance on stretch stitch."
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