JUKI MO-6800S Series Engineer's Manual page 43

Adjustment procedures
1. Bring the needle bar ❹ to the lower dead point.
2. Loosen the setscrew ❶ .
3. Adjust a position of the needle bar lubricating pin ❷ so that a
clearance provided between the needle bar lubricating pin ❷ and
the needle bar driving pin ❸ should be 0.1 to 0.3 mm.
* Adjustment of 0.1 to 0.3 mm is convenient to use a thickness
gauge or the like.
(Caution) A clearance should be 0.1 to 0.3 mm at an interme-
diate position of the needle bar stroke.
4. Tighten the setscrew ❶ .
[60H]
1. Bring the needle bar ❹ to the lower dead point.
2. Loosen the setscrew ❶ .
3. Adjust a position of the needle bar lubricating pin ❷ so that a
clearance provided between the needle bar lubricating pin ❷ and
the setscrew ❻ of needle bar driving arm ❺ should be 0.1 to 0.2
mm.
4. Tighten the setscrew ❶ .
Results of Improper adjustment
If the clearance provided be-
o
tween the needle bar lubricating
pin ❷ and the needle bar driving
pin ❸ is too small, the related
components will come in contact
with each other.
If the clearance provided be-
o
tween the needle bar lubricating
pin ❷ and the needle bar driving
pin ❸ is too large, oil will not be
fed properly resulting in seizure.
– 31 –