JUKI MEB-3200 Engineer's Manual page 63

Adjustment Procedures
1. Loosen four setscrews 1 in the turning motor installing plate.
2. Hook a spring balancer to hole 3 in turning motor installing
plate 2 and draw the balancer with 9.8N force in the direction
of the arrow mark "a".
3. While drawing the spring balancer, tighten four setscrews 1 in
the turning motor installing plate.
Adjustment Procedures
1. Loosen setscrew 1 in the rotary connecting pulley.
2. Turn needle bar rotary pulley 2 in the direction of the arrow
mark "a" and adjust so that the clearance between A and B
(0.03 to 0.1 mm) is equal while observing the respective
clearances of the needle and the looper when the needle going
up from the inside needle lower dead position is aligned with
the looper and when the needle coming down to the outside
needle lower dead position is aligned with the looper.
Results of Improper Adjustment
When the tension is high :
™ Looper bracket tilts and the
relation with the looper is
warped.
When the tension is low :
™ Tooth skipping of the timing belt
occurs.
Results of Improper Adjustment
When the clearances are not equal :
™ Stitch bite width is decreased.
™ Stitches tilt.
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