Clearance Between The Needle And The Blade Point Of The Hook; Position Of The Bobbin Case Stopper Plate - JUKI HZL-30Z Service Manual

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

Remove the face cover and the throat plate.
How to adjust

4-10 Position of the bobbin case stopper plate

Remove the throat plate.
How to adjust
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
Loosening direction
* 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.
Drive body stop shaft (2)
Setscrew
Needle bar lateral
adjusting 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.
Bobbin case stopper plate
Clearance provided between the needle and the hook
becomes larger.
Clearance provided between the needle and the hook
becomes smaller.
Setscrew
Projection of bobbin case
Setscrew (3)
-12- -12- -12- -12- -12-
Needle
Blade point
of hook
0.05 to 0.1 mm
To align
Bobbin case stopper plate