SunStar SWF/B Series User Manual page 140

Error Type
Dent on thread path on
hook and bobbin case
Narrow space between
hook holder and groove for
hook holder (on hook)
Insufficient oil in hook
Poor timing of needle and
hook
Incorrect lower dear stop
Dent on thread path
Fabric moves on the frame
Inadequate height of
presser foot (does not
press the work material)
Cause
Remove dent or change
Adjust space
Oil the raceway of hook
Adjust timing
Adjust the lower dead stop
Check:
• Thread path in presser foot
• Around needle hole on
needle plate
• Thread guide on the head
• Thread path in tension adjuster
Fix the fabric firmly
Adjust height
Inspection & Repair Reference
Check rotary hook
Set it at 0.5-0.7mm for
smooth passage of
upper thread
See 5.11.4
See 11.9
See 11.6