Troubleshooting Chart-Continued

Table 4-4.—Troubleshooting Chart-Continued 1. Stitching Problems—Continued Trouble Probable Cause Remedy FAILURE TO Wrong variety needle Change to correct length needle. MAKE A S T I T CH Bent needle Change. Needle not all the way in the Insert correctly. needlebar Safety clutch disengaged Clear jam and reengage clutch. S K I P P ED Hook too far from needle Move hook saddle. S T I T C H ES Hook out of time Retime. Needlebar improperly set Reset. Needle not all the way into bar Insert correctly. Needle incorrectly aligned Insert correctly. . . Thread too large for needle eye Select correct needle. T H R E AD Thread controller Adjust spring tension and/or spring stop. B R E A K A GE Right twist thread Change to left twist (Z). Hook point piercing needle thread Needle eye too small Burr on needle point Hook out of time (retarded) Too much tension Improper threading sequence Thread unwinding incorrectly Thread breaks when clearing work Set hook to needle. Select larger size. Remove burr or replace needle. Retime. Adjust tension springs. Rethread (check first). Adjust stand and/or spool. Adjust tension release. Thread take-up lever not at highest point. 2. Feeding Problems F E E D Arm shaft not in time with sewing Retime by take-up lever and timing plate F A I L U RE hook driving shaft (timing collar spline screw m u s t be in spline). Feed lifting cam fork inverted Install properly. 4-14