Janome 6260QC Service Manual page 5

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