10
DC4030P
Test pin
Point of hook
–0.1 to +0.05 mm
Hinge screw (C)
Setscrew (B)
Hook set plate
Setscrew (A)
NEEDLE CLEARANCE TO SHUTTLE
The clearance between the needle and the tip of hook should be -0.1 to +0.05 mm.
PREPARATION:
1. Remove the needle plate, bobbin holder, and bed cover (see page 3), and replace the needle with the test pin.
2. Turn the power switch on, and select pattern " " (simple zigzag). (Maximum zigzag width)
ADJUSTMENT PROCEDURE:
1. Loosen the screws (A), (B), (C), then slightly tighten the hinge screw (C).
2. Turn the handwheel toward you, and adjust the clearance between test pin and the point of the hook in the
left and right needle position to –0.1 to +0.05 mm by moving the hook set plate up or down.
3. Tighten the setscrews (A), (B), (C).
4. Check the backlash of the hook drive gear and lower shaft gear. If the backlash is too great or not enough,
adjust the backlash (see page 11).
5. Attach the bed cover, needle plate and bobbin holder, and remove the master needle.
MECHANICAL ADJUSTMENT
Bobbin holder
Needle plate
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