ETA 7750-415 Ratchat Wheel

Product Description

Genuine ETA 7750-415 Ratchet Wheel, Made in Switzerland, brand new — the original factory ratchet gear for the ETA/Valjoux 7750 chronograph movement’s automatic winding mechanism. Precisely engineered with precisely cut ratchet teeth that engage with the pawl to enable unidirectional winding, the Ratchet Wheel converts bidirectional oscillating weight motion into single-direction power to wind the mainspring. An essential replacement part for restoring a worn or damaged ratchet wheel during movement service. Original ETA part — the professional’s choice for genuine automatic winding restoration.

Features & Function

• Genuine ETA 7750-415 — original Swiss-made factory part, brand new, authentic, part number 7750-415
• Ratchet wheel — ratchet gear with precisely cut asymmetric teeth engaging with the pawl for unidirectional automatic winding
• Automatic winding conversion — converts bidirectional rotor motion into single-direction power to wind the mainspring
• Winding protection — ratchet teeth design allows free rotation in one direction while locking in the other to protect the mainspring
• Original factory quality — exact tooth profile and dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, damaged, or stripped Ratchet Wheel in the ETA/Valjoux 7750 movement
• Repair of automatic winding failures: ratchet teeth engagement failure or winding not functioning
• Repair of ratchet mechanism issues: ratchet teeth worn, stripped, or not engaging properly with pawl
• Repair of mainspring winding issues: mainspring not receiving power due to ratchet failure
• Professional movement service, overhaul, and chronograph restoration

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-415 Ratchet Wheel, Made in Switzerland, brand new. It is an original factory part from ETA (Swatch Group), the world’s leading movement manufacturer. Not a generic or replica part.

Q2: How do I confirm this part fits my movement?
A: Confirm your movement is an ETA/Valjoux 7750 chronograph. The part number 7750-415 is the specific Ratchet Wheel for this movement. Common brand applications include: IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform.

Q3: What does the Ratchet Wheel do?
A: The Ratchet Wheel (7750-415) is the key power-transferring gear in the automatic winding mechanism. The automatic winding chain is: Oscillating weight (rotor) → Pawl (engages ratchet) → Ratchet Wheel → Mainspring barrel. The ratchet wheel has asymmetric ratchet teeth — they are designed so that the pawl can push past them in one direction (winding direction), but locks against them in the other direction (preventing unwinding). As the rotor spins, the pawl pushes the ratchet wheel forward in the winding direction, winding the mainspring. When the rotor tries to reverse, the pawl locks against the ratchet teeth, preventing the mainspring from unwinding. Without a functioning ratchet wheel, the automatic winding cannot transmit power to the mainspring.

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