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8-6

Error Type Cause

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 dead stop

Dent on thread path

Fabric moves on the

frame

Inadequate height of

presser foot

(does not press the work

material)

Inspection & Repair

Remove dent or change the

case

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 material firmly

Adjust height

Set it at 0.5-0.7mm for

smooth feeding of upper

thread

Reference

SWF E-Series User Manual

Other manuals for SWF E-Series