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This is a genuine ETA 7750-1482 ratchet wheel driving wheel. As an authentic Swiss-made part, it is specifically designed for the ETA 7750 automatic chronograph movement.
This component plays a critical role in the automatic winding system, transferring power from the oscillating weight to the mainspring barrel.
Genuine ETA Part – Swiss factory-original for Caliber 7750, not a copy.
Automatic Winding Core – Transfers rotor power to the mainspring barrel for efficient winding.
Precision Machined – Accurate gear teeth and bore for smooth power transfer and low wear.
Essential for Service – Common failure point when automatic winding efficiency drops or fails.
Compatible Movement – Designed for ETA 7750 (Valjoux 7750) automatic chronograph.
| Parameter | Details |
|---|---|
| Part Name | Ratchet Wheel Driving Wheel |
| Part Number | ETA 7750-1482 |
| Compatible Movement | ETA/Valjoux 7750 automatic chronograph |
| Function | Power transmission in automatic winding system |
| Origin | Switzerland |
| Condition | Brand new, genuine |
ETA 7750 (Valjoux 7750) automatic chronograph (common in Breitling, Omega, IWC, Tissot, etc.)
Repair of reduced automatic winding efficiency or rotor spinning without winding action
Replacement of worn, broken, or damaged ratchet wheel driving wheels during movement service
1. Is this a genuine ETA part?
Yes. It is a Swiss ETA factory-original part (7750-1482) for the 7750 movement.
2. What are the symptoms of a damaged ratchet driving wheel?
Symptoms: rotor spins normally but automatic winding is very poor (low power reserve); manual winding works but automatic does not; unusual noise or grinding during automatic winding.
3. What should I pay attention to during installation?
This wheel sits in the automatic module, working with reversing wheels and the ratchet wheel. Clean the train, inspect reversers. Use recommended lubrication. Professional installation is strongly recommended.
4. Does this part fit the Sellita SW500?
SW500 is an alternative to 7750. Automatic parts are often interchangeable, but using dedicated SW500 parts is recommended for best fit. This genuine ETA part may work.
5. When should it be replaced?
Inspect for worn, deformed, or broken teeth during service. If automatic winding fails after ruling out reversers and rotor bearings, replace this wheel.
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