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TECHNICAL GUIDE
5
Oscillating weight with ball bearing
• How to remove and install
A screwdriver having a tip as shown in the illustration at right is
convenient for removing or installing the oscillating weight with
ball bearing.
9
First reduction wheel and pinion
• How to remove
Before removing the first reduction wheel and pinion, be sure to
unwind the mainspring. To do so, move the click in the direction
of the arrow with tweezers as shown in the illustration at right
while turning the crown gently counterclockwise. If the click is
moved without turning the crown counterclockwise, the mainspring
will be unwound forcibly all at once and may cause the mainspring
to be damaged.
11 Auxiliary train wheel bridge
• Setting position
Intermediate small
hour hand corrector
wheel and pinion
Small hour hand wheel
Day driving wheel
Date star
10
Intermediate small hour hand
Day driving wheel
corrector wheel and pinion
Small hour hand corrector lever
Yoke
Minute wheel and pinion
Cal. 4S77A
Tweezers
Click
Complete barrel
with mainspring
Setting lever
Small hour hand corrector
winding stem
Small hour hand corrector
setting wheel
Setting lever spring
Day wheel
Hammer
Intermediate day driving
wheel
Intermediate wheel for
day corrector (A)
Intermediate date corrector
setting wheel (A)
Intermediate date corrector
setting wheel (B)
Date jumper
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