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This is a genuine Jaeger-LeCoultre second wheel for Caliber 854, a Swiss‑made original movement part for the manual‑wind Caliber 854. As a key component of the gear train, the second wheel transmits power from the third wheel to the escapement and drives the center seconds hand, directly affecting timekeeping stability and accuracy. This original factory part is the ideal choice for watchmakers to restore seconds hand function and timekeeping precision when servicing Caliber 854 movements.
Genuine JLC Part – Swiss factory‑original for Caliber 854, not a copy.
Gear Train Core – Sits between the third wheel and escape wheel, also drives the center seconds hand.
Precision Machined – Accurate gear teeth and pivots for smooth power transfer and low wear.
Essential for Service – Replace when the seconds hand does not move, wobbles, or timekeeping is inaccurate.
Compatible Movement – Designed for Jaeger-LeCoultre Caliber 854 manual‑wind.
| Parameter | Details |
|---|---|
| Part Name | Second Wheel |
| Compatible Movement | Jaeger-LeCoultre Caliber 854 manual‑wind |
| Type | Genuine original |
| Function | Transmits power to escapement, drives center seconds hand |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Jaeger-LeCoultre Caliber 854 manual‑wind movement (common in classic Reverso watches).
Repair of seconds hand not moving, wobbling, inaccurate timekeeping, or stoppage.
Replacement of worn, broken‑tooth, or bent‑pivot second wheels during movement service.
1. Is this a genuine JLC second wheel?
Yes. It is a Swiss factory‑original part for Caliber 854, not a copy.
2. What are the symptoms of a damaged second wheel?
Symptoms: very slow running or stoppage; seconds hand does not move, moves weakly, or wobbles; unusual noise or hesitation in the gear train.
3. What should I pay attention to during installation?
The second wheel sits between the third wheel and escape wheel. Ensure both pivots drop into jewels and the teeth mesh correctly. Follow the JLC technical guide. Professional installation is strongly recommended.
4. Does this second wheel fit other JLC calibers (e.g., variations of 854)?
Parts within the Caliber 854 family are generally interchangeable, but verify with the parts diagram.
5. When should it be replaced?
Inspect for worn, deformed, or broken teeth; bent or worn pivots. If accuracy cannot be restored after servicing other components, replace the second wheel.
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