JUKI HZL-30Z, Service Manual

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4-9 Clearance between the needle and the blade point of the hook

Remove the face cover and the throat plate.

1. Set the machine to the zigzag pattern (large) (zigzag width 5 mm). Raise the needle
    bar by hand from the lowest point of its stroke and make sure that the clearance
    provided between the blade point of the hook and the needle is 0.05 mm to 0.1 mm at
    the left and right needle entry points when the blade point of the hook comes to the
    rear of the center of the needle.  (To such an extent that the needle slightly moves
    when it is lightly pressed with a small screwdriver or the like.)
2. Turn drive body stop shaft 

(2)

 and adjust the clearance.

    Tightening direction          Clearance provided between the needle and the hook
                                          becomes larger.
    Loosening direction          Clearance provided between the needle and the hook
                                          becomes smaller.
* When the clearances at left needle entry point and the right needle entry point are
  different from each other, loosen setscrews (left) and (right) in the needle bar lateral
  adjusting plate (asm.) and move the needle bar lateral adjusting plate (asm.) to the left
  or right to adjust the clearances.

How to adjust

Drive body stop shaft 

(2)

Blade point

of hook

4-10 Position of the bobbin case stopper plate

Remove the throat plate.

1. On condition that the bobbin case is set to the outer hook, loosen setscrew 

(3)

 and

    determine the longitudinal position of the bobbin case stopper plate so that the rear
    end of the projection of the bobbin case aligns with the rear end of the plate spring of
    the bobbin case stopper plate.
    In addition, for the lateral position, make the turn stopper come in contact with the
    right side as much as the occurrence of the play and fix it with setscrew 

(3)

.

* Wipe out the race face of the hook or the bobbin case with alcohol since there may be
  a case where dirt, oil, grease, etc. stitck on the race face of the hook or the bobbin
  case.
  Otherwise, running noise, noise from the bobbin case, noise of slip-off of the thread,
  etc. will happen.

How to adjust

Projection of bobbin case

Setscrew 

(3)

Bobbin case stopper plate

Setscrew

Needle bar lateral
adjusting plate

Setscrew

Needle

0.05 to 0.1 mm

To align

Bobbin case stopper plate