JUKI MOL-254 Engineer's Manual page 45

Adjustment Procedures
Loosen setscrews to adjust the position.
Loosen lock nut in the presser bar lifting cylinder and turn
cylinder rod to adjust the lift.
Results of Improper Adjustment
If the lower plate protrudes from the
cloth presser foot, it will interfere
with needle and needle breakage or
thread breakage may occur.
If the presser foot is excessively
raised, skew may be produced.
If the presser foot is excessively
lowered, it will interfere with the belt
loop supplying device or belt loops.
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