Figure 4-4.Timing arrows

Figure 4-3.Side view of Model 225 sewing machine showing oiling points

Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices - index
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Figure 4-4.—Timing arrows. the thread take-up lever with your fingers. You must check to ensure the arrows on the timing collar and the timing plate are aligned as shown in figure 4-4 (B) and (C). If the arrows don’t match, remove the connection belt from the lower pulley (figure 4-4 [A] and [D]). Now turn the lower pulley by hand until the arrow on the timing collar (figure 4-4 [B]) is in direct line with the arrow on the timing plate (figure 4-4 [C]). Replace the connection belt. This completes this timing point. 2. Setting the feed dog height Proper feed dog height is necessary to obtain proper feeding action. To set the feed dogs, proceed as follows: a. Turn the balance wheel toward the operator until the feed dog reaches its highest point (figure 4-5), and observe the relationship of the feed dog and the throat plate. If the valley between the teeth is level with the top of the throat Figure 4-5.—Feed dogs. 4-5

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