Pfaff 433 - Page 40

33. Trouble Shooting
Skipping of stitches
1. Incorrect threading
2. Wrong needle used
3. Needle inserted incorrectly
4. Needle too thin for thread used
5. Needle too thick for thread used
6. Needle bent
7. Needle at incorrect height
8. Too wide o clearance between needle and pjoint of hook (.004'
9. Needle rise insufficient
10. Processing adhesive or heavily dressed mate iais
11. Thread twisted too much
Thread Breaking
1. For any of the above reasons
2. Thread tensions too tight
3. Knotty
thread
4. Thread has become unserviceable because of
5. Inferior quality thread
6. Thread jamming in the hook race
7. Rough edges of needle hole
8. Thread has slipped from spool and snarled u^
9. Incorrect setting of check spring
10. Point of needle blunt as a result of hitting th
Needle Breakage
1. Needle bent and struck by point of hook
2. Thread too thick for needle used
3. Timing of hook disturbed after thread jamming
4. Needle thread tension too tight
5. Needle deflected by hard spots in material
6. Needle bent because material is pushed or bulled
7. Machine feeds while needle is down in material
8. Hook set too close to needle
9. Needle too thin for material sewn
10. Thread snarled up on spool pin
38
extensive and dry storage
around spool pin
e hook, etc.
From the library of: Superior Sewing Machine & Supply LLC