JUKI LH-4128-7 Engineer's Manual page 17

3) Needle bar height
o LH-4128, LH-4128-7
1. Set stitch dial "Minimum".
2. Turn the handwheel to bring needle bar
3. Loosen the needle bar connecting setscrew
4. Align the upper marker line engraved on the needle bar
lower end face of the needle bar rocking base
bar connecting setscrew
o LH-4168-7, LH-4188-7
1. Set the stitch dial at "Minimum".
2. Turn the handwheel to bring needle bar
3. Remove the cap , and loosen the setscrew
4. Align the uppermost marker line engraved on the needle bar
the lower end face of the needle bar rocking base
tightening screw at a tightening torque of 5.9N•m (60kgf•cm).
(Caution) 1. After the adjustment, the needle entry point in the
needle slot in the feed dog may change.
2. When tightening the setscrew
the needle throwing drive arm
arrow.
(When the DPX17 is used)
While the DPX17 is used, the second engraved marking line from the
bottom of the needle bar
face of the needle bar rocking base
Adjustment Procedure
to the lowest dead point.
.
to the lowest dead point.
shall be made to coincide with the lowest
.
.
with the
and tighten the needle
.
with
and tighten the
, make sure not to shift
in the direction of the
– 13 –
Results of Improper Adjustment
o Change in height of the needle
bar may result in stitch skipping
or thread breakage.
o If the needle throwing drive arm
is shifted, this can be a cause
of needle bar torque or needle
bar lock-up.