Seiko YT57B - Oscillating Weight Bridge Screw; Oscillating Weight Bridge; Generating Coil Block; Intermediate Wheel for Generating Rotor

8
TECHNICAL GUIDE
Cal. YT57B
Lubricating: : Moebius A
22 Oscillating weight bridge screw
24 Oscillating weight bridge
· Before tightening the oscillating weight bridge
screw, check that the upper pivot of the
generating rotor is inserted properly into the
pivot jewel.
· Be sure to lubricate the upper and lower pivots
of generating rotor and intermediate wheel for
generating rotor with the proper oil in the
quantity specified in the illustration.
· Lubricate the ball-bearing of the oscillating
weight bridge as shown in the illustration at
right.
Intermediate wheel for
generating rotor
Generating rotor
25 Generating coil block
The generating coil block for Cal. YT57B and that for Cal. 5M4 Series have a close resemblance in shape.
They can be discriminated by the size of the pattern on the lead terminal. If the generating coil block
for Cal. 5M4 Series is assembled by mistake, no electricity will be generated. When repairing the
generating coil block, check the size of the pattern on the lead terminal to make sure you are using the
proper one.
Smaller pattern Larger pattern
[ Generating coil block for Cal. YT57B ] [ Generating coil block for Cal. 5M4 Series ]
26 Intermediate wheel for generating rotor
• Lubricating
Refer to the illustration at right.
Note: Be sure to observe the position, type of oil
and quantity of the lubrication specified
in the illustration.