3
PROBLEM
CAUSE
REMEDY
REFERENCE
6. Noisy
1. Backlash between shuttle hook See mechanical adjustment
P. 13
operation
gear and lower shaft gear is
“Clearance between needle and
too great.
shuttle race (NO. 2).”
2. Lower shaft gear is loose.
Eliminate the looseness.
3. Inappropriate belt tension.
See mechanical adjustment
P. 21
“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. 10
pattern
synchronization.
“Needle swing.”
2. Inappropriate disengagement See mechanical adjustment
P. 20
of cam follower.
“Disengagement of cam follower.”
3. Upper thread tension is too
Adjust upper thread tension
P. 7
strong.
correctly.
4. Inappropriate feed balance.
See mechanical adjustment
P. 18
"Feed balance on stretch stitch."
Summary of Contents for 43
Page 1: ...SERVICE MANUAL PARTS LIST MODEL Magenta 43 First Edition 08 July 2020...
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