Adjusting The Needle Thread Tension; Tension Knob - JUKI HZL-30Z Service Manual

4-13 Adjusting the needle thread tension

Remove the face cover and the front panel.
How to adjust

4-14 Tension knob

The tension knob has the structure which can make the correction when the needle thread tension is desired
to be corrected after assembling the front panel and the thread spool cover.
How to adjust
1. Remove the tension knob fixing E ring
and remove the thread tension dial
presser, the tension knob and the
tension cam.
2. Prepare SHAPPE SPAN # 60 and the
tension gauge, and pass needle thread
from the base tension to the tension
disk.
3. Lower the presser lifting lever, attach
SHAPPE SPAN # 60 to the tension
gauge, and turn the adjusting nut to
adjust so that the tension is 0.588 [N]
(approx. 60 g).
4. After the adjustment, set the tension
cam to the groove in the adjusting nut
so that the convex of the tension cam
is in the position which is lower by
approximately 7 mm than the crest line
of the thread guide cover B.
5. Fix the tension knob so that the center
of the latch section of the tension knob
meets with the convex of the tension
cam.
6. Fix again the thread tension dial presser
and the tension knob fixing E ring.
7. Fix the tension cam positioning plate.
1. In case of increasing the needle thread tension
1) Turn the tension knob in the direction of "a"
until it comes in contact with the stopper.
2) Move (shift) the tension knob to the right side
and the engagement with the tension cam is
disengaged. On this condition, turn the tension
knob in the direction of "a".
2. In case of decreasing the needle thread tension
1) Turn the tension knob in the direction of "b"
until it comes in contact with the stopper.
2) Move (shift) the tension knob to the right side
and the engagement with the tension cam is
disengaged. In this state, turn the tension
knob in the direction of "b".
* After performing the adjustment of 4-13,
re-adjust so that the thread tightness ratio is
100 to 108 % with cotton broad cloth and
SHAPPE SPAN #60.
Then perform fine adjustment in the 4-14 above.
Adjusting nut
Crest line
7mm
Convex
-14- -14- -14- -14- -14-
Tension gauge
Tension cam Tension knob
Latch section
Thread guide cover B
b
a
Tension knob