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Seiko 4S77A Parts Catalogue /Technical Manual

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PARTS CATALOGUE / TECHNICAL GUIDE
[SPECIFICATIONS]
Brand
Item
Movement
Outside diameter
Movement size
Casing diameter
Height
Time indication
Vibrations per hour
Additional mechanism
Loss/gain
Jewels
Cal. 4S77A
Cal. No.
ø26.0 mm
ø25.6 mm
5.38 mm
Three hands (Hour, minute and second hands)
with 24-hour, date and day hands
28,800 (8 beats per second)
• Automatic winding (with auxiliary hand winding mechanism)
• Calendar indicated by hands (Date and day of the week)
• Instant setting device for date and day calendar
• 24-hour hand
• Independent adjustment of hour hand
• Micro-regulating device
• Second setting device
• Regulating device by micro-positioning regulator pin
Daily rate at normal temperature range: Within a range between
+15 seconds and -10 seconds
28 jewels
CREDOR
4S77A
(x 1.0)
1

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Summary of Contents for Seiko 4S77A

  • Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 4S77A [SPECIFICATIONS] Brand CREDOR Cal. No. 4S77A Item Movement (x 1.0) Outside diameter ø26.0 mm Movement size Casing diameter ø25.6 mm Height 5.38 mm Three hands (Hour, minute and second hands) Time indication with 24-hour, date and day hands...

  • Page 2: Parts Catalogue

    Reassembling procedures Figs. : Lubricating: Types of oil Oil quantity Moebius V Liberal quantity Moebius A Normal quantity SEIKO Watch Oil S-6 Extremely small SEIKO Watch Oil S-4 SEIKO Watch Oil S-3 Hour, minute and second hands 24-hour hand Day hand...
  • Page 3 PARTS CATALOGUE Cal. 4S77A 0509 108 Oscillating weight with ball bearing 0012 744 Screw for framework for automatic device (2 pcs.) Diafix Framework for automatic device 0012 284 Screw for barrel and train wheel bridge (3 pcs.) 0112 284 Barrel and train wheel bridge...
  • Page 4 PARTS CATALOGUE Cal. 4S77A 0012 201 Auxiliary plate screw (B) 0012 820 Auxiliary plate screw (A) 0102 117 Auxiliary plate (Crown wheel) 0387 007 0012 513 Minute wheel bridge Rachet wheel screw (left-hand thread) 0285 023 Rachet wheel 0281 076...
  • Page 5 PARTS CATALOGUE Cal. 4S77A • List of screws Part No. Name Part No. Name • Stud screw • Click screw 0012 121 0012 672 • Screw for barrel and train • Screw for friction spring wheel bridge for second wheel pinion •...
  • Page 6 PARTS CATALOGUE Cal. 4S77A • List of jewels Part No. Name Part No. Name 0011 221 • Diashock upper/lower cap jewel • Upper/lower hole jewel for third 0011 540 wheel and pinion • Diafix upper cap jewel for fourth 0011 541 •...
  • Page 7 61 Second wheel pinion 70 Center wheel and pinion • Discrimination of the hand installation height Cal. 4S77A watches have numerals printed on the dial and movement to indicate the hand installation height. When repairing, refer to the tables below. Height...

  • Page 8: Technical Guide

    TECHNICAL GUIDE Cal. 4S77A • The explanation here is only for the particular points of Cal. 4S77A. REMARKS ON DISASSEMBLING AND REASSEMBLING Within 3° on both sides How to install the hands of the center of the hour marker 24-hour hand...
  • Page 9 TECHNICAL GUIDE Cal. 4S77A 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. Day wheel Hammer Intermediate day driving wheel Setting position of the date driving wheel and day indicator driving wheel •...
  • Page 10 TECHNICAL GUIDE Cal. 4S77A 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. First reduction wheel and pinion Tweezers •...
  • Page 11 TECHNICAL GUIDE Cal. 4S77A 38 Minute wheel bridge • Lubricating Lubricate the crown wheel of the minute wheel bridge at the portion indicated in the illustration below. <Top view> <Cross section> Crown wheel Minute wheel bridge Crown wheel 55 Jewelled pallet fork and staff •...
  • Page 12 63 Complete barrel with mainspring • Lubricating It is not necessary to disassemble the complete barrel with mainspring. If it is disassembled for cleaning purposes, lubricate 2 to 3 portions inside the barrel with SEIKO Watch Oil S-3. <Top view> <Cross section>...
  • Page 13 TECHNICAL GUIDE Cal. 4S77A REFERENCE How to wind the main spring Click • Manual winding mechanism By turning the crown clockwise while the winding pinion and sliding crown wheel engage with each other (while the crown is at the normal or first click position), the...

  • Page 14: How To Operate

    TECHNICAL GUIDE Cal. 4S77A Regulating device by micro-positioning regulator pin The accuracy of the watch can be adjusted by To extend the clearance: To reduce the clearance: moving the lever attached to the regulator device as shown in the illustration to extend or reduce the clearance between the regulator key and regulator pin.
  • Page 16 99-4 Printed in Japan...