Pfaff 145 Owner's Manual - Page 16

18. Trouble Shooting Machine Skips Stitches Cause Wrong needle system. Needle bent. Needle inserted incorrectly. Incorrect threading. Remedy For correct needle system see Chapter 6. Insert new needle as instructed in Chapter 7. Orient needle so that its short groove faces toward the sewing hook. Thread needle as instructed in Chapters 5 and 8. Thread Breaks Cause For any of the reasons indicated above. Tread tensions too tight. Knotty thread. Needle point blunt or damaged. Thread snarled up. Remedy See remedies listed above. Regulate tensions as instructed in Chapter 10. Use high-quality thread only. Replace needle. Check upper threading from spool of thread to needle. Faulty Stitch Formation Cause Improper tension. Wrong needle size and/or thread used, Pieces of thread between tension discs or under bobbin case tension spring, Remedy Regulate tensions as instructed in Chapter 10. Correlate needle, thread and fabric as shown in table in Chapter 6. Remove thread and re-adjust tension as instructed in Chapter 10. Needle Breaks Cause Wrong needle system. Needle bent. Needle too thin. Remedy Insert needle of correct system as instructed in Chapter 6. Insert new needle. Insert thicker needle. Machine Works Heavily Cause Lack of oil. Wrong lubricant. Hook race obstructed by pieces of thread. Remedy Oil machine as instructed in Chapter 3. Use only non-resinous and acid-free sewing machine oil. Try to free the jammed thread as you rock the balance wheel back and forth. If this action should fail, dismantle the sewing hook as instructed in Chapter 13. 15