promelectroavtomat M3000C, Service Manual, Page: 43 / 67

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11. HEIGHT OF FEED DOG
STANDARD
When the balance wheel is turned to raise the feed dog to its highest position, the standard height of the feed dog
above the needle plate should be 0.9-1.1 mm.
ADJUSTMENT
1. Turn the balance wheel to raise the feed dog to its highest position.
2. Loosen the screw securing the vertical feed roller shaft.
3. Turn the vertical feed roller shaft to adjust the feed dog height to within 0.9-1.1 mm.
4. Tighten the screw securing the vertical feed roller shaft.
Adjustment Points
1. If the feed dog is too high, the following problems may occur: the feed dog may contact the back of the
needle plate, a noise may be generated, an incorrect forward and backward motion of the feed bar may
be produced, an incorrect feed may be produced, or the fabric may not feed.
2. If the feed dog is too low, an incorrect feed may be produced or the fabric may not feed.
(
∗
Check by stacking two scales, one on top of the other.)
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