Pfaff 16 Owner's Manual - Page 13

Cause and remedy of faults f6. Please always remember: many faults can be remedied merely by cleaning and oiling the machine. Machine works heavily 1. The driving strop is either too tight or too slack - length en or shorten the strap, or, - if- necessary, fit a new one to the machine. 2. Some of the working ports of -the mechanism are dry -- apply a few drops of oil to the parts concerned. 3. The machine is dirty clean it. 4. The machine is gummed owing to the use of unsuitoble oil - clean the machine with paraffin. Machine is noisy 1. Some of the working ports are dry - oil the parts c once r ii ed. 2, Screws ore loose - tighten them with the aid of a screw -driver. The Upper Thread breaks 1. Inferior quality, knotty sewing thread breaks easily - use a better quality. 2. The needle is too fine for the thread or fabric used use a thicker needle (see page 4: "Relative Needle Sizes and Thread Numbers"). 3. The Upper thread tension is too strong loosen the tension (see page 10: "Regulating the Thread Tensions"). 20 4. The eye of the needle has a knife edqe - change the needle. . Dirt and fluff are interfering with the free movement of the feed dog, causing intermittent feeding of the material remove needle plate and thoroughly clean the feed. 6. The hole in needle plate has developed a rough edge and catches the thread - consult a sewing machine expert. The Under Thread breaks 1. Inferior quality, knotty sewing thread breaks easily use a better quality. 2. The tension of shuttle thread is too strong - loosen it (see page 10: "Regulating the Thread Tensions"). 3. The tension of shuttle thread is too weak - tighten the screw (see page 10: "Regulating the Thread Tensians"). 4. The hole in needle plate has developed a rough edge, and catches the thread - consult a sewing machine expert. Stitches are skipped 1. The needle has been set either too high or too low, or it is bent or blunt - straighten it or use a new needle (see page 5: "Setting the Needle"). 2. The needle is either too thin or too thick for the thread used - change the needle or use a different thread to comply with the details given in the chart on page 4: (" Relative Needle Sizes and Thread Numbers"). 21