JUKI MO-6000S series Engineer's Manual page 61

Adjustment Procedures
Loosen top presser adjusting screw nut 1, when tightening top
presser adjusting screw 2, the top feed dog pressure is increased
and feed force is increased. After the adjustment, be sure to tighten
top presser adjusting screw nut 1.
(Caution) When the top feed dog jumps and noise becomes
large during using the sewing machine, tighten top presser
adjusting screw 2 until noise becomes small. When the
machine is used for many hours while noise is excessively
large, a forcible load is applied to other section. So, be
careful.
1) Loosen lifter B stopper nut 1 and turn lifter B stopper screw 2
to adjust the lifting amount.
2) After the adjustment, tighten lifter B stopper nut 1.
<Checking after adjustment>
Play between the top end of lifter B stopper screw 2 and
presser lifting arm 3 should be 0.5 to 1 mm when the top
feed dog is brought to the lowest point (needle bar is at highest
point).
(Top end of the screw should be separated from presser lifting
arm 3 by 0.5 to 1 mm when pulling the lifter B with finger.)
Results of Improper Adjustment
™ When top feed dog pressure is
excessively low
Top feed dog jumps and noise
becomes large.
Feed force is decreased.
™ When top feed dog pressure is
excessively high
Feed dog defect is put on some
materials.
Unnecessary load is applied to
the sewing machine and the
sewing machine is influenced for
the worse by it.
Noise level is increased.
™ When the lifting amount of the
top feed dog is excessively high,
contact occurs between vertical
shaft and lifter B, and noise
occurs when operating the
sewing machine.
™ When the lifting amount of the
top feed dog is excessively low,
when entering cloth at the start
o f s e w i n g h e a v y - w e i g h t
materials, cloth may be not able
to be entered at the top feed
dog.
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