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TECHNICAL GUIDE
Setting position of the day wheel
Slide the hammer so that it engages with the pinion of the day wheel as shown in the illustration below.
Setting position of the date driving wheel and day indicator driving wheel
• Check that the notched portion of the day driving wheel aligns with a tooth of the intermediate day driving
wheel.
• Set the day driving wheel so that the midpoint between its two protrusions aligns with the center of the
hour wheel.
• Set the date driving wheel so that its protrusion aligns with the indented portion on the auxiliary plate.
• Check that the notched portion of the date driving wheel aligns with a tooth of the date star.
Check that the notched portion of
the day driving wheel aligns with a
tooth of the intermediate day
driving wheel.
Day driving wheel
Set the day driving
wheel so that the
midpoint between its
two protrusions
aligns with the center
of the hour wheel.
Day wheel
Hammer
Intermediate day driving wheel
Hour wheel
Date driving wheel
Set the date driving wheel so
that its protrusion aligns with
the indented portion on the
auxiliary plate.
Intermediate day driving wheel
Indented portion
on the auxiliary plate
Cal. 4S77A
Date jumper
Date star
Check that the notched portion
of the date driving wheel aligns
with a tooth of the date star.
9
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