ETA 7750-8086 Oscillating Pinion

Product Description

The ETA 7750-8086 Oscillating Pinion is a genuine Swiss-made component for the ETA/Valjoux 7750 automatic chronograph movement. As a critical part of the chronograph mechanism, the oscillating pinion engages and disengages the chronograph seconds wheel when the pusher is activated. It is a common service replacement part when chronograph start/stop issues or irregular resetting behavior occurs.

Features & Function

• Genuine ETA/Valjoux part – authentic Swiss-made component for the ETA 7750 movement

• Chronograph mechanism component – engages and disengages the chronograph seconds wheel

• Critical for chronograph function – enables smooth start, stop, and reset operations

• Direct replacement – drop-in replacement for worn or damaged pinions

• Precision-engineered – manufactured to ETA’s original specifications

Specifications

• Part Number: 7750-8086

• Compatible Movements: ETA/Valjoux 7750, 7751, 7753, 7754, 7760, 7765

• Movement Diameter: 30.0 mm

• Movement Height: 7.9 mm

• Jewels: 25

• Frequency: 28,800 vph (4 Hz)

• Power Reserve: 42–48 hours

• Origin: Switzerland (ETA factory part)

• Condition: Brand new

Applications

• Service and overhaul of ETA 7750-series movements

• Chronograph mechanism repair – replacing worn or damaged oscillating pinions

• Chronograph function restoration – resolving start/stop or reset issues

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 7750-8086), made in Switzerland. It is not an aftermarket or generic copy.

2. Which movements is this oscillating pinion compatible with?
This part is compatible with the ETA/Valjoux 7750 and its variants, including 7751, 7753, 7754, 7760, and 7765.

3. What are the signs that the oscillating pinion needs replacement?
Common signs include chronograph not starting/stopping smoothly, irregular resetting behavior, jumping seconds hand, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues.

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