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To Remove and Replace the Sewing Hook

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239.458 Figure 9-49.—Timing sewing hook. position, the point of the sewing hook should be at the center of the needle (fig. 9-49). If the sewing hook is not timed correctly, loosen the three setscrews in its hub. Turn the hook on its shaft to align the point with the center of the needle, as shown in figure 9-50. Tighten the three setscrews. To Remove and Replace the Sewing Hook Remove the needle, slide plate, and bobbin case. Take out screw (D of fig. 9-50) and remove hook retainer (E of fig. 9-50). Loosen the three setscrews in the hub. Turn the handwheel until the thread guard (widest part) of the hook is at 239.459 Figure 9-50.—Sewing hook. 239.460 Figure 9-51.—Removing sewing hook. the bottom, then remove the sewing hook from its shaft (fig. 9-5 1). When installing a new sewing hook, have the thread guard at the bottom. Now turn the bobbin case holder until the notch (F) is at the top. Replace the hook retainer (E) watching that the projection (G) near its end (fig. 9-50) enters notch (F) in the bobbin case holder. Fasten the hook retainer to the underside of the bed by means of its screw. Replace the needle and time the sewing hook as described in the preceding paragraph. Reinstall the bobbin case, throat plate, and slide plate. Timing the Feeding Mechanism The feeding mechanism is timed at the factory for average stitching performance. Normal timing is such that the feed dog teeth, rising from their lowest position, should be just flush with the surface of the throat (needle) plate after the needle point has traveled about 5/16 inch above the plate while on its upstroke. To adjust the feeding mechanism, remove the top cover from the machine. Turn the handwheel toward you until the two setscrews, which lock the feed eccentric into the main shaft, come into view (fig. 9-5 1). Loosen both setscrews; lightly tap the feed eccentric toward you to advance the feed timing. To retard the feed timing, tap the eccentric to rotate it toward the rear of the machine. 9-38



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