Seiko Cal. 4S15A Movement Parts Catalogue & Technical Guide
Complete technical reference and parts catalogue for the Seiko Cal. 4S15A automatic movement. This workshop manual covers all specifications for this 26.0mm diameter movement (25.6mm casing diameter, 4.17mm height) with 25 jewels and 28,800 vibrations per hour beat rate. Includes detailed exploded diagrams identifying each principal component, lubrication schedules with specific oil types and precise application quantities for optimal performance, and step-by-step guidance on disassembly and reassembly procedures. Covers the automatic winding system with manual winding capability, date window mechanism, second-hand setting device, micro-regulating adjustment, and fine-positioning regulator pin. Essential for watchmakers performing maintenance, service work, or complete overhauls on this movement. Helps technicians source correct replacement parts and understand proper assembly sequences.
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Document Details
- Format
- Pages
- 13
- Size
- 382.6 KB
- Category
- Watchmaking