typical GC6-7D - Needle and Rotating Hook Timing; Adjusting Needle Bar Position; Adjusting Rotating Hook Point Timing

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21.Timing between the needle and the rotating hook (Fig.23、24、25、2
(b) The needle thread tension is too weak or the
bobbin threal is too strong, turn the tension regulating
thumb nut clockwise to make the needle thread get
more tension or turn the bobbin case tension regulating
screw counter clockwise with small plastic screw
driver to make the bobbin thread get less tension
(Fig.22)
(c) Other abnormal stitches as shown in Fig.20
(d) .(e), adjustment can be made which reference to
the above methods.
1.Adjusting the position of needle bar
Turn the balance wheel to locate the needle bar
(C) at its lowest position, remove the rubber plug in
the face plate (A), then loosen the needle bar (C)
connecting stud clamping screw (B) and move the
needle bar (C) vertically to locate the timing position
(The timing position of the needle bar is : when the
needle bar at its lowest position, the center of needle
eye (D) coincide with inside surface (E) of bobbin
case bolder as shown in Fig.24). Tighten clamping
screw (B), plug the rubber plug.
22
23
A
B
C
D
E
24