We may have found other answers which could help you.
Click here for Lervia Kh 4000were is the tune up screw on lervia kh 4000?
sewing machine wont pick up thread?
Sewing machine issue?
How do I unjam my Lervia KH4000 Sewing Machine?
how can i fix my lerviakh4000 wont sew?
Lervia Free Arm sewing machine KH4000 ?