Needle Bar Height - promelectroavtomat ULT2003D Service Manual

6.

NEEDLE BAR HEIGHT

STANDARD
When test mode "5" is selected, turn the balance wheel so that the needle meets the rotary hook point. At this
time, the clearance between the upper end of the needle eye and the bottom of the rotary hook point should be
1.0-1.4 mm.
ADJUSTMENT
1. Select test mode "5".
2. Turn the balance wheel so that the needle meets the rotary hook point.
3. Loosen the screw of the needle bar block assembly.
4. Move the needle bar vertically to adjust the clearance to between 1.0-1.4 mm.
5. Tighten the screw of the needle bar block assembly.
NOTE :The needle bar clamp should be parallel to the side of the needle plate. If the needle bar is loose
when you adjust the needle bar height, it may result in sewing troubles.
Adjustment Points
1. If the needle bar height is too low or too high, skipped stitches, split thread or cut thread may occur. (Refer
to (A).)
2. While adjusting the needle bar height, check the needle threading hook.
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