Singer The SINGER 160 Instruction Manual 5 - Page 28

21.TROUBLE CHART PROBLEM PROBABLE CAUSE f CORRECTION Breaking lower thread Thread not wound evenly on the bobbin or not drawn up correctly Lower thread tension too tight Lint stuck in the bobbin case and inside the tension spring P.10, P. 5 P.12 Remove lint and fluff with a cleaning brush Skipping stitches Needle not fully inserted Needle bent Size or type of needle and thread not suitable for the material Incorrect upper threading Too. much oil on the hook P. 7 P. 7 P .16 P.13 P.40 Irregular stitches Incorrect size of needle for the material Upper thread tension too loose Incorrect lower tension P.16 P.19 P.12 The material not fed correctly Pattern selection dial not set correctly Incorrect feed dog height Lint stuck on the feed dog P.17 P.12 P.39