Pfaff 80 Owner's Manual - Page 40

2. Needle Thread Breaks Cause: The above-mentioned may cause thread breakage. Thread tension too tight. Poor, knotty or rotten thread used. Hook raceway is jammed with thread or needs oiling. 3. Needle Breaks Cause: Bent needle strikes point of sewing hook, Needle too thin or thread too heavy. Fabric pulls needle so it bends and strikes needle plate, Remedy: See remedies listed under 1. above. Adjust tensions as instructed. Use good-quality threods only. Clean and oil hook raceway. Remedy: Replace needle at once to prevent further damage. Use correct needle and thread sizes (see page 14). Don't force the feeding motion. Guide the material lightly. 38