Pfaff hobbymatic 917 Owner's Manual - Page 67
Poor-quality - how to thread
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4 Faults and their remedies Cause: 1. Machine skips stitches Needle not inserted correctly. Wrong needle used. Needle bent or blunt. Machine threaded improperly. Needle too thin for thread used. 2. Needle thread breaks For any of above reasons. Thread tension too strong. Poor-quality or knotty thread used, or thread that has become too dry by excessive storage. 3. Needle breaks Needle not pushed up as far as it will go. Needle bent. Needle too thin or too thick. Needle bent and strikes needle plate because work is pushed or pulled. Bobbin case improperly inserted. 4. Seam is not uniform Tension out of adjustment. Thread too thick, knotty or hard. Bobbin thread wound unevenly. Kinks appear on top and bottom of material. Remedy: Push needle up as far as it will go, its flat shank side facing toward the back. Insert system 130/705 H needle. Insert new needle. Check threading. Insert thicker needle. See par. 1 above. Regulate thread tension. Use onty. good-quality thread. Insert new needle and push it up as far as it will go. Insert new needle. Refer to needle table. Let machine feed the work alone. Only guide the material lightly. When inserting the bobbin case, push it in as far as it will go. Check upper and lower tensions. Use first-class thread only. During bobbin winding, do not hold thread in hand, but pass it through the bobbin tension stud. Thread machine properly and check both tensions.