Operation Manual

Contents Page:
Service Instructions Cl. 69-373
(Edition 02/2008) Cl. 69-373H
1. General
1.1 Gauge set ................................................... 4
2. Zero position, feeding with sewing equipment
2.1 Checking the zero position (position of the stitch regulator link)................... 5
2.2 Settingofthebottomfeed.......................................... 6
2.2.1 Positionofthefeeddoginthethroatplatecutout ........................... 6
2.2.2 Advancingmovementofthefeeddog................................... 7
2.2.3 Lifting movement of the feed dog (only with the class 69-373H) ................... 8
2.3 Synchronous run of the needle and bottom feed ............................ 10
2.4 Setting of the upper feed .......................................... 11
2.4.1 Stroke of the upper feed and the material presser foot......................... 11
2.4.2 Advancing movement of the upper feed foot ............................... 12
2.5 Stitch regulator (equal stitch length for forward and reverse stitching) ............... 13
3. Sewing foot height and sewing foot lifting
3.1 Sewingfootliftingwiththeliftinglever .................................. 14
3.2 Sewingfootliftingwiththekneelever................................... 15
4. Opening the thread tension
4.1 Threadcontrollerspring........................................... 17
5. Needle bar height .............................................. 18
6. Hook settings
6.1 Loop stroke and clearance of the hook point to the needle ...................... 19
6.2 Bobbin case holder.............................................. 20
7. Bobbin winder ................................................ 21
8. Oil lubrication
8.1 General..................................................... 22
8.2 Lubrication points............................................... 23
9. Maintenance ................................................. 24
10. Summary of all sewing machine settings ............................... 25
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