JUKI MOL-254 Engineer's Manual page 47

Adjustment Procedures
1) Remove the face plate.
2) Loosen two setscrews
move the needle bar up or down to adjust the height.
3) After performing the adjustment, securely tighten two
setscrews.
① Change the operation box panel to the adjustment screen.
(Refer to page 45 of the Instruction Manual.)
② Select the hook adjustment mode <BB> and press the
selection key . The hook adjustment screen appears.
③ The hook moves in a unit of 0.01 mm with the ten key "1"
(open) or "7" (close), and is possible to move in a unit of
0.1 mm with the ten key "2" or "8". However, moving 0.1
mm cannot be accepted when the needle bar is not in the
stop position.
④ The clearance provided between the needle and the hook
can be adjusted by the panel according to the adjusted
needle gauge
(Caution) ○ At this time, be sure to check the needle and
the needle hole.
○ Be sure to press "R" key after performing
the adjustment.
in the needle bar connection and
40
− −
Results of Improper Adjustment
If the engraved marker line on the
needle bar is higher than the end
face of the lower bushing, stitch
skipping may occur often, and if it
is lower, pull-up of thread may be
defective.
If the clearance provided between
t h e n e e d l e a n d t h e h o o k i s
excessively large, stitch skipping or
thread breakage will occur and if it
is excessively small, blunt of the
blade point of hook or thread
breakage will occur.