JUKI MF-7700D Series Engineer's Manual page 29

Adjustment Procedure
1. Remove rubber cap
needle bar bracket and adjust the height of the needle bar.
2. After adjusting the height, equally adjust the clearance A between
needle and needle hole
bar with setscrew
in the face plate, loosen setscrew
in the throat plate and fix the needle
in the needle bar bracket.
A
Equal
Results of Improper Adjustment
in the
– 25 –
o When the height of the needle
is excessively different, stitch
skipping, needle breakage,
thread breakage, etc. will be
caused.