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Poor stitch

tension

Needle breaks

① Weak upper thread tension

② Uneven upper thread

tension due to foreign

substances

③ Weak lower thread tension

④ Uneven lower thread

tension

⑤ Thread thickness

⑥ Poor timing of needle and

hook

⑦ Insufficient oil in hook

① Bent needle

② Bad quality needle

③ Tip of the needle is worn or

bent

④ Inadequate needle size

⑤ Needle touches the hook

point

⑥ Incorrect installation of

needle

⑦ Needle touches the needle

hole on the needle plate

■ Adjust tension

■ Clean main and sub tension

adjusters in the thread

tension adjusting plate

■ Adjust lower thread tension

■ Clean bobbin case and

check tension on bobbin

spring

■ Change to quality thread

■ Adjust timing

■ Oil the raceway of hook

■ Change needle

■ Space the needle and the

hook point

■ Correct the installation

■ Check if needle plate is

unscrewed

■ Adjust the position of the

needle bar

Inspection & Repair CauseError Type Reference

Brand	SWF
Model	MAN-12
Category	Sewing Machine
Language	English

SWF MAN-12 User Manual

Table of Contents

Questions and Answers:

SWF MAN-12 Specifications

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