JUKI MF-7900 Series Engineer's Manual page 57

Adjustment procedures
1. Adjusting the height of the presser foot
Loosen adjustment nut ❷ . Lower lifter lever ❶ , adjust height
adjustment screw ❸ , and fix nut ❷ at the position where the
presser foot does not come in contact with other components.
2. Adjusting the lifter connecting plate
For the adjustment of the clearance provided between lifter
connecting plate ❹ and hinge screw ❺ , loosen setscrew ❼
in the lifter lever shaft when the feed dog lowers from the top
surface of the throat plate and the bottom face of the presser
foot comes in close contact with the throat plate.
Results of Improper adjustment
◦ When the position of the press-
er foot is too high, it comes in
contact with the spreader, and
breakage, stitch skipping, etc.
will be caused.
In addition, the needle tip comes
out from the sole of the presser
foot. As a result, sewing material
is damaged or needle breakage
will be caused.
◦ When the clearance of lifter con-
necting plate ❹ does not exist,
not only feed force is reduced
but also components are led to
breakage since the presser foot
does not come down to the top
surface of the throat plate when
the feed dog comes down from
the top surface of the throat
plate.
◦ When adjusting the lever shaft,
adjust the height of lifter lever ❶ .
– 43 –