13
MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND HOOK POINT
* The clearance between the needle and the point of hook should be –0.1 to +0.05 mm.
PREPARATION:
1. Remove the needle plate, bobbin holder, and bed cover, 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 setscrews (A), (B), (C), then slightly tighten the hinge screw (C).
2. Turn the handwheel toward you to bring the hook point behind the needle. Adjust the clearance between the 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, gear and lower shaft gear (see page 14).
5. Attach the bed cover, needle plate and bobbin holder, and remove the test pin.
Hinge screw (C)
Setscrew (B)
Setscrew (A)
Bobbin holder
Needle plate
–0.1 to +0.05 mm
Test pin
Point of hook
Hook set plate
Summary of Contents for NH40
Page 1: ...SERVICE MANUAL MODEL NH40...
