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This is a genuine ETA original 2543 intermediate date wheel, designed for ETA calibers 2834, 2836 and 2846 automatic movements. As a key transmission component in the calendar module, it smoothly transfers power from the date quick‑set mechanism to the date jumper, enabling precise and instantaneous date changes. As an OEM part, it offers watchmakers a reliable solution to restore the calendar function, ensuring accurate date alignment and smooth date‑advance operation.
Genuine quality: Factory‑produced by ETA Switzerland, brand new, fully compliant with original material and precision standards.
Compatible movements: ETA 2834 (day/date), 2836 (date/day, different stem heights), 2846 (economy automatic, 21,600 vph).
Part number: ETA 2543.
Core function: Positioned between the date quick‑set wheel train and the date jumper, the intermediate date wheel transfers torque from the crown or corrector pusher to the date jumper, driving the date disc stepwise.
Construction: Precision‑milled steel wheel with a pinion, ensuring accurate meshing with adjacent gears.
Repair value: When a movement exhibits quick‑set failure, sticky date change, date misalignment, or grinding noises in the calendar train, the intermediate date wheel (worn teeth or loose pivot) is often the cause – replace with this genuine part.
Q1: If the date jumps two or more days per quick‑set action, is the intermediate date wheel at fault?
A: Not necessarily. Possible causes: ① weak date jumper spring; ② worn date jumper teeth; ③ damaged or misaligned intermediate date wheel. Disassemble and inspect – replace the calendar train as a set.
Q2: The quick‑set feels very stiff after installation – what should I do?
A: Possible causes: ① insufficient lubrication on the intermediate wheel pivot; ② date cover plate screws too tight; ③ overly tight gear meshing or debris. First re‑lubricate; then slightly loosen the cover screws. If still stiff, check gear compatibility.
Q3: Can I use an intermediate date wheel from a 2834 on a 2836 movement?
A: Yes. The calendar mechanisms of the 2834 and 2836 are identical – the intermediate date wheel is interchangeable. 2846 also uses the same part.
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