ETA 7750-8171 Chronograph Cam

Product Description

Genuine ETA 7750-8171 Chronograph Cam, Made in Switzerland, brand new — the original factory heart-shaped cam for the ETA/Valjoux 7750 chronograph movement’s reset mechanism. Precisely engineered with a precise curved cam profile that drives the reset hammers outward when the chronograph reset is activated, the Chronograph Cam coordinates the entire reset sequence and ensures all chronograph hands return precisely to zero. An essential replacement part for restoring a worn or damaged cam during movement service. Original ETA part — the professional’s choice for genuine chronograph reset restoration.

Features & Function

• Genuine ETA 7750-8171 — original Swiss-made factory part, brand new, authentic, part number 7750-8171
• Chronograph cam — heart-shaped cam with precise curved profile that drives reset hammer motion during reset
• Reset sequence coordination — controls the timing and force of all reset hammers to ensure simultaneous zero return
• Cam-driven reset — the curved cam surface translates pusher input into precisely coordinated hammer motion
• Original factory quality — exact cam profile geometry and dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Specifications

Applications

• Replacement of worn, damaged, or stripped Chronograph Cam in the ETA/Valjoux 7750 movement
• Repair of chronograph reset failures: chronograph hands not returning to zero, uneven reset, or reset jamming
• Repair of cam profile wear: worn cam surface causing weak or inconsistent reset force
• Repair of reset sequence issues: reset hammers not deploying properly due to cam malfunction
• Professional movement service, overhaul, and chronograph restoration

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-8171 Chronograph Cam, 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 7750-8171 is the specific Chronograph Cam 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 Chronograph Cam do?
A: The Chronograph Cam (7750-8171) is the heart of the chronograph reset mechanism — it is the heart-shaped rotating cam that coordinates the entire reset sequence. When you press the reset pusher, a reset lever pushes against the cam’s curved profile, causing it to rotate. As the cam rotates, its precisely machined surface pushes the reset hammers outward, which in turn push the chronograph seconds, minute counter, and hour counter hands back to zero simultaneously. The cam’s specific profile determines the exact timing, sequence, and force of the reset. Without a functioning cam, the reset hammers have no driving force, and the chronograph hands cannot return to zero.

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