Table 4-4.—Troubieshooting Chart-Continued

Table 4-4.—Troubieshooting Chart-Continued Trouble Probable Cause Remedy F A I L U RE Feed-driving crank loose Tighten Pinch Screw. TO FEED S T I T C H ES Insufficient presser foot pressure Add spring pressure. NOT IN LINE Presser bar improperly set Adjust presser bar. Feed dogs too low Set height to one full tooth. M A T E R I A L Presser foot pressure too great Reduce pressure. DAMAGED BY S C U F F I NG Feed dogs too high Set one full tooth or less. S L U G G I SH Improper oil or accumulation of Clean with recommended solvent. O P E R A T I ON foreign matter FAILURE TO Needle in backwards MAKE A S T I T CH Needle threaded from wrong side Wrong variety of needle Bent needle Needle not all the way in the needlebar Needlebar out of adjustment Shuttle driver pin sheared Shuttle too far from needle Install correctly. Thread correctly. Change to correct length needle. Change. Insert correctly. Adjust needlebar. Replace pin. Shim shuttle closer to needle. 1. Stitching Problems FAILURE TO Needle in backwards Remove and reinstall. MAKE A S T I T CH Machine out of time Inspect and retime. Needle threaded from wrong side Thread correctly. Hook too far away from needle Reset hook saddle. 4-13