Pfaff 18 Owner's Manual - Page 16

The bobbin thread breaks Cause: T. When the bobbin thread is not wound correctly, it gets entangled. 2. The bobbin thread has slipped out from under the tension spring of the bobbin case. Remedy: Wind it properly. Draw it back under the tension spring. The machine skips stitches Cause: 1. The needle is not attached to the needle bar correctly. 2. The needle is either blunt or bent. 3. The needle is damaged. 28 Remedy: Attach it properly. Replace it. Replace it. The needle breaks Cause 1. The needle is bent. 2. The needle is not attached properly. 3. The material is too thick or heavy. 4. The material is pulled by the operator. 5. The needle is of inferior quality. Remedy: Insert a new needle. Attach it correctly. Use the correct needle for the material. Don't pull on the fabric. Replace it with a high-quality needle. Looping of stitches Cause: 1. The thread tenson is not properly adjusted. Remedy: Adjust the upper and lower thread tensions, as instructed. 29