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This is a genuine Jaeger‑LeCoultre winding pinion for Caliber 854 manual‑winding movement, Swiss‑made. As a critical component of the keyless works, the winding pinion is mounted on the winding stem and works with the clutch wheel to transmit crown rotation to the movement, enabling manual winding and time setting. This original factory part is the ideal replacement for watchmakers to restore winding and setting functions when servicing the Caliber 854 movement.
Genuine JLC Part – Swiss factory‑original for Caliber 854, not a copy.
Keyless Works Core – Connects the crown to the movement for manual winding and time setting.
Precision Machined – Accurate gear teeth and sliding surfaces for smooth operation and reliable engagement.
Essential for Service – Replace when manual winding slips, spins freely, or setting feels sticky.
Compatible Movement – Designed for Jaeger‑LeCoultre Caliber 854 manual‑wind (common in Reverso).
| Parameter | Details |
|---|---|
| Part Name | Winding Pinion |
| Compatible Movement | Jaeger‑LeCoultre Caliber 854 manual‑winding |
| Type | Genuine original |
| Function | Transmits crown torque for manual winding and time setting |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Jaeger‑LeCoultre Caliber 854 manual‑winding movement (common in classic Reverso models).
Repair of manual winding failure, crown spinning without effect, or slipping.
Troubleshooting of non‑functional time setting or vague crown positions.
Replacement of worn or damaged winding pinions during movement service.
1. Is this a genuine Jaeger‑LeCoultre winding pinion?
Yes. It is a Swiss factory‑original part for Caliber 854, not a copy.
2. What are the symptoms of a damaged winding pinion?
Symptoms: the crown spins freely when winding (no resistance); cannot wind the mainspring; hands do not move or slip when setting time; vague or sticky keyless feel.
3. What should I pay attention to during installation?
The winding pinion sits on the stem. Clean the keyless works before assembly. Test smooth winding and setting mode switching after installation. Professional help is recommended.
4. Does the clutch wheel need to be replaced at the same time?
Not always. If the clutch wheel teeth are also visibly worn (rounded), replace both. Inspect both components.
5. Does this part fit other JLC calibers like Caliber 856?
Different calibers may have different winding pinion dimensions. Caliber 856 is an automatic movement with a different keyless design – not interchangeable. Verify with the parts diagram.
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