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General| Model | 503 |
|---|---|
| Feed Type | Drop Feed |
| Operation | Mechanical |
| Stitch Types | Straight, Zigzag |
| Needle Positions | Left, center, right |
| Presser Feet | buttonhole, zipper |
| Included Accessories | Bobbins, Needles, Screwdrivers, Seam Ripper |
Cleaning and oiling procedures for the sewing machine components.
Measuring and adjusting thread clearances for optimal sewing machine performance.
Setting and adjusting the needle thread tension for proper stitch formation.
Adjusting needle bar ball bushings to resolve side-shake or binding.
Adjusting the needle bar to its proper height for sewing.
Aligning the rotating hook with the needle for correct stitch timing.
Adjusting the distance between the hook point and the needle.
Servicing the needle thread tension assembly.
Procedures for removing and replacing the rotating hook and position finger.
Procedures for removing and replacing the needle bar.
Procedures for removing and replacing the presser bar assembly.
Procedures for removing and replacing the horizontal arm shaft.
Procedures for removing and replacing the machine motor.
Procedures for removing and replacing the machine's light fixture.
Aligning the cam stack for proper machine operation.
Aligning the disc driving worm wheel for proper timing.
Checklist for identifying causes when the sewing machine binds.
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