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SINGER SEWING MACHINES 31-15, 331K1, AND CONSEW C-30
Table 4-4.Troubieshooting Chart-Continued

Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices - index
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Table 4-4.—Troubleshooting Chart A. Troubleshooting Chart Trouble Probable Cause Remedy 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 Adjust thread controller spring stop. Needle eye too small Select larger size. Burr on needle point Remove burr or replace needle. . Too much tension Adjust tension springs. Improper threading sequence Rethread (check first). Thread unwinding incorrectly Adjust stand and/or spool. Thread breaks when clearing work Adjust tension release. Thread take-up lever not at highest point. S K I P P ED Needlebar improperly set S T I T C H ES Needle not all the way into Needle incorrectly aligned Reset. b ar Insert correctly. Insert correctly. Thread too large large for needle Select correct needle. eye Presser bar maladjusted Adjust presser bar. T H R E AD Operating machine without ma- Unthread when running without fabric. J A M M I N G terial U N D ER T H R O AT Failure to hold free ends of thread Maintain pressure. P L A T E for first stitches Needle thread not between tension Thread disc. discs. U P P ER Feed-driving eccentric improperly Adjust eccentric. T H R E AD adjusted L O O P I NG U N D ER No upper thread tension Adjust or place thread in tension disc. M A T E R I AL 4-12







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