Adjusting the Feed Dog Height

For average weight material, a full tooth should be visible when the feed dogs are at their highest point. To adjust the feed dog height, you must loosen the feed lifting crank pinch screw (figure 4-17 [A]) in the feed lifting crank and move the feed bar (figure 4-17 [B]) up or down as required. Then you must retighten the feed

Figure 4-16.\Setting needlebar. ^{lifting crank pinch screw.}

Figure 4-17.\Adjusting feed dogs.

Centering the Feeding Action

Set the sewing machine to its maximum stitch length. Loosen the feed-driving rockshaft crank pinch screw (figure 4-18 [A]). Rotate the feeddriving rockshaft (figure 4-18 [D]) so that the feed dog's movement is an equal distance from the front and rear of the throat plate slots. After you do this, retighten the feed-driving rockshaft crank pinch screw.

Setting Side Play of Feed Dogs

Loosen the adjusting screw locknuts (figure 4-18 [B]). Adjust the feed-driving rockshaft (figure 4-18 [D]) to center the side play of the feed dogs by turning the adjusting screws (figure 4-18 [C]) left or right as needed; then retighten the adjusting screw locknuts. Be sure the adjusting screw locknuts hold the feed-driving rockshaft snugly in place without binding.

Timing the Feed-Driving Eccentric

Timing the feed-driving eccentric is accomplished as follows:

1. Set the stitch regulator to its lowest point. This gives the operator the maximum stitch length of 7 SPI.

2. Rotate the balance wheel toward the operator until the feed dogs complete their movement aft and before they begin to drop. At this point the needle must be entering the material being sewn. If this doesn't occur, the following trial-and-error sequence must be made:

Open the cover located on the rear of the uprise. Rotate the balance wheel until the feeddriving eccentric setscrew becomes visible (figure 4-19 [A]). Loosen this screw. Now place your finger or a screwdriver on the feed-driving eccentric to hold the eccentric in place, and rotate the balance wheel a short distance. Retighten the feed-driving eccentric setscrew. Continue this procedure until the sewing machine complies with step 2.