Seiko 4R35A User Manual

PARTS LIST / TECHNICAL GUIDE
Automatic Cal. 4
R35A
[SPECIFICATIONS]
1/18
Item
Cal. No.
4R35A
Driving system
Additional function
Crown operation
Loss/Gain
Regulation system
Number of jewels
Normal position
1st click position
2nd click position
Lift angle of the escapment
Vibration per hour
Power reserve
Time indication
• 3 hands (hour, minute and second hands)
• Date indication
• Diameter Outside: Ø 27.4 mm
Casing: Ø 27.0 mm
• Height: 5.25 mm
Movement size
Automatic winding with manual winding mechanism
• 3 hands (Hour, Minute and Small Second hands)
• Date indicator
• Date correction function
• Second hand stop function
Date setting (counterclockwise)
Time setting (Hour and minute)
Manual winding (clockwise only)
21,
600 (6 beats per second)
Between + 45 and - 35 seconds
Mainspring
wind up status
Testing positions
(Isochronism
fault: T24-T0)
± 30 s/d
Measurement
(daily rate in
seconds:s/d)
Dial upward:
T0 (CH)
Daily rate worn
on the wrist at
t e m p e r a t u r e -
range between
5 °C and 35 °C)
Stan d a r d r a te
for measurement
6 o’clock
at the top
Dial upward :
T24 (CH)
9 o’clock
at the top
A
fter 24 hours
from fully wind
up
Fully wind up
± 30 s/d
23 jewels
ETACHRON system
F
rom fully wound to stoppage: Approximately 41 hours
52 °
Second hand stop
± 20 s/d
± 30 s/d

Seiko 4R35A Specifications

General

Movement Type	Automatic
Caliber	4R35
Jewels	23
Power Reserve	Approximately 41 hours
Hacking Feature	Yes
Manual Winding	Yes
Diameter	27.4 mm
Height	5.32 mm
Functions	Hours, minutes, seconds, date
Frequency	21, 600 vibrations per hour
Accuracy	+45/-35 seconds per day

Summary

SPECIFICATIONS

FEATURES

CHARACTERISTICS OF A MECHANICAL WATCH

PARTS LIST

Finding Correct Watch Parts

Guidance on identifying parts based on case design and catalog.

Screw Parts Cross-Section View

Visual identification of various screw types used in the movement.

Disassembly and Reassembly Tools and Consumables

Lists essential tools and watch oils for maintenance.

TECHNICAL GUIDE

Movement Disassembly and Reassembly

Key remarks and steps for dismantling and reassembling the watch movement.

Balance and Escapement Procedures

Detailed steps for disassembling and reassembling balance and escapement components.

Oscillating Weight Reassembly

Instructions for aligning and installing the oscillating weight for efficient winding.

Regulation and Isochronism Adjustment

Guidance on adjusting watch accuracy using the Etachron system.

Function Check Procedures

Steps to verify correct operation of watch functions after assembly.

Water Resistance Testing

Methods and pressure standards for performing water resistance tests.

Accuracy and Duration Tests

How to test the watch's timekeeping accuracy and power reserve.