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CONTENTS
1. Brief introduction 1
2. Main specifications 1
3. Machine installation and operation preparation 1
1. Machine installation 1-3
2. Operation preparation and notice before running 3-4
4. Machine operation 5-6
1. Coordination among needle, thread and materials 5
2. Install the needle 5
3. Winding the bobbin thread 5-6
5. Machine adjustment 6-9
1. Adjust the needle thread tension and bobbin thread tension 6-7
2. Adjust the pressure of presser foot 7
3. Adjust the safety clutch device 7-9
1. MSK-8420BL-18 machine casting components 10-13
2. MSK-8400BL-18 machine casting components 14-17
3. Upper shaft and presser foot components 18-19
4. Needle bar and lower feed components 20-23
5. Lower shaft thread looping components 24-25
6. Stitch length adjustment components 26-27
7. Knee lifter and winding components 28-29
8. Lubrication components 30-31
9. Accessories 32-33
Operation instruction
Parts manual