JUKI MO-6800S Series Engineer's Manual page 17

Adjustment procedures
1. Take off the upper cover, loosen the clamping screw ❷ of needle
driving forked crank ❶ and move needle driving forked crank ❶
up or down to adjust the needle height.
(Caution) Do not fully loosen the clamping screw ❷ of the
needle driving forked crank ❶ . If the needle driving
forked crank has got out of position laterally when
its clamping screw was loosened, fully loosen the
clamping screw and turn pulley to allow the forked
crank to turn until it settles by itself. Then tighten the
clamping screw to fix the forked crank at that posi-
tion.
Adjustment procedures
1. Loosen four setscrews ❷ of two throat plate bases ❶ and move
two throat plate bases ❶ back and forth to adjust dimension A or B.
❷
❶
❷
❶
❷
– 5 –
Results of Improper adjustment
Any other needle height than
o
specified here will badly affect
the action of the lower looper,
the timing for catching the upper
looper thread, etc.
Improper lateral position of the
o
needle driving forked crank ❶
will cause seizure, play, or other
troubles.
Results of Improper adjustment
Improperly positioned throat
o
plate will cause needle break-
age, contact of the needles will
the throat plate, or other trou-
bles.