Adjusting The Bobbin Thread Tension; Opening Amount Of The Tension Disk - JUKI HZL-30Z Service Manual

4-11 Adjusting the bobbin thread tension

Remove the throat plate.
How to adjust 1. Position the bobbin case and the tension gauge as illustrated and adjust the adjusting

4-12 Opening amount of the tension disk

Remove the face cover and the front panel.
How to adjust 1. Turn the adjusting screw in the thread
screw (4) so that the tension is 0.1862±0.0098 [N] (19g±1g) with SHAPPE
#60 thread.
Bobbin case
Tension gauge
tension disk floating plate and adjust
so that the clearance between tension
disk (A) and tension disk (B) is 1 mm
when the thread tension dial is set to
the maximum and the presser lifting
lever is raised.
(4)
Adjusting
screw
Disk A
-13- -13- -13- -13- -13-
Bobbin thread should not come
in contact with bobbin case.
Tension gauge
Thread tension
disk floating plate
Disk B
1 mm