Technical guide and parts list for the Seiko Cal. 4R35B/4R36A automatic mechanical watch movement.
The document provides detailed specifications of the Seiko Cal. 4R35B/4R36A movement, including dimensions, power reserve, jewel count, lift angle and vibration rate. It also describes the functions, calendar mechanisms, and differences between the 4R35B and 4R36A calibers.
A complete parts list is given with part numbers, diagrams and lubrication recommendations. The guide includes disassembly and re‑assembly procedures, regulation of isochronism, inspection checkpoints, water‑resistance testing and rate measurement instructions for watchmakers and service technicians.
| Outside diameter | Ø 27.4 mm |
|---|---|
| Casing diameter | Ø 27.0 mm |
| Height | 5.32 mm |
| Power reserve | Approximately 40 hours |
| Number of jewels | 24 jewels |
| Lift angle | 53° |
| Vibration frequency | 21,600 vibrations per hour (5 beats per second) |
| Daily rate tolerance | ±20 s/d (4R35B) / ±30 s/d (4R36A) |
The power reserve is approximately 40 hours from fully wound to stoppage.
The movement uses 24 jewels.