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SETTING SEWING HOOK TO OR FROM NEEDLE
Removing the Arm Shaft Connection Belt

Aircrew Survival Equipmentman 2 - Aviation theories and other practices
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the throat plate and clean all lint and dirt from between the grooves and teeth of the feed dog. Tip the machine back and turn the balance wheel toward the operator until the feed dog is in its highest position. Loosen the screw in the feed lifting cam fork and raise or lower the dog as desired; then retighten the screw. A properly set feed dog will show a full tooth above the throat plate when at its highest position. After adjusting the feed dog, check to see that the needle is properly set in the hole in the feed dog. If adjustment is needed, loosen the pinch screws in the feed driving rock frame,    and set the needle so that when it is all the way down, it will be slightly forward of center in the hole. Retighten the pinch screws. The feed adjust- ment points are illustrated in figure 9-37. ADJUSTING FEED ECCENTRIC.— The feed eccentric (fig. 9-38) may occasionally need adjustment to remove play caused by wear of the gib, or by looseness between the feed eccentric and the eccentric body. To adjust the gib, loosen the two locking screws, then turn inward on the adjusting screws until all play is eliminated and the eccentric fits in the slot properly. 240.86 Figure 9-37.—Feed adjustment for the 211 W 151 sewing machine. 240.87 Figure 9-38.—The feed eccentric. CAUTION LOCKING SCREWS MUST BE LOOSENED BEFORE ATTEMPTING TO LOOSEN ADJUSTING SCREWS. RETIGHTEN THE LOCKING SCREWS AFTER ADJUSTMENT IS MADE. The feed eccentric collar may be moved to the right or left to change spring tension, but it is ordinarily set flush with the hub of the eccentric body. CHANGING THE LENGTH OF THE STITCH.— TO change the length of stitch, stop the machine. Turn the balance wheel, by hand, toward the operator until the button drops (clicks), then turn the machine pulley until the number representing the desired stitches per inch is lined up properly and then release the button. CAUTION DISENGAGE THE BUTTON BEFORE ATTEMPTING TO SEW. DO NOT ENGAGE THE BUTTON WHILE THE MACHINE IS IN OPERATION. Removing Components To remove the hook, takeoff the presser foot, throat plate, and feed dog; then loosen the two 9-29







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