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This is a genuine intermediate wheel designed for ETA Calibers 2824-2, 2834-2, and 2836-2 self-winding movements, with part number 203, Article 10, Made in Switzerland. The intermediate wheel is a key component of the gear train, positioned between the seconds wheel and the escape wheel, responsible for transmitting power from the mainspring barrel to the escapement system. As an original factory part, it is the ideal choice for replacing worn components during service or repair.
| Feature | Description |
|---|---|
| Compatible Movements | ETA 2824-2, ETA 2834-2, ETA 2836-2 |
| Part Number | 203 |
| Article Number | 10 |
| Part Name | Intermediate Wheel |
| System | Gear Train |
| Core Function | Transmits power from the seconds wheel to the escape wheel – a critical link in the power transmission path |
| Position | Between the seconds wheel and the escape wheel |
| Material | High-precision steel, precision machined |
| Origin | Made in Switzerland |
| Product Type | Genuine ETA part |
ETA 2824-2 Technical Background:
| Parameter | Value |
|---|---|
| Movement Type | Self-winding mechanical |
| Diameter | 25.6 mm (11.5 lines) |
| Thickness | 4.60 mm |
| Jewels | 25 |
| Power Reserve | Approx. 38-40 hours |
| Frequency | 28,800 vph (4 Hz) |
| Winding Direction | Bi-directional automatic |
Movement Variant Differences:
2824-2: Basic 3-hand with date
2834-2: Day-date display with day at 12 o‘clock
2836-2: Day-date display with day and date at 3 o’clock
| Instruction | Details |
|---|---|
| Primary Use | As an intermediate gear train component, transmits power from the seconds wheel to the escape wheel |
| Normal Function | Meshes with seconds wheel and escape wheel to ensure smooth power transmission and stable movement operation |
| Failure Symptoms | Worn intermediate wheel causes: unstable movement operation, increased time deviation, reduced power reserve, unusually low amplitude |
| Step | Instruction |
|---|---|
| 1. Remove Automatic Module | Remove the automatic winding module to access the gear train |
| 2. Remove Train Wheel Bridge | Loosen and remove the screws securing the train wheel bridge (typically 3 screws) |
| 3. Remove Wheels in Sequence | Remove wheels in correct order: third wheel → great wheel → intermediate wheel (203) → escape wheel |
| 4. Cleaning | Clean the train wheel bridge and mounting area to remove old oil and debris |
| 5. Install New Intermediate Wheel | Place the new intermediate wheel in position, ensuring proper gear meshing |
| 6. Install Train Wheel Bridge | Reinstall the train wheel bridge and tighten the 3 screws in a diagonal sequence |
| 7. Testing | Manually wind and observe smooth gear train operation without unusual noise |
Important Note: Proper installation sequence and gear meshing are critical. Ensure the intermediate wheel (203) teeth fully align with adjacent gears before securing the bridge. Train wheel bridge screws should not be over-tightened or under-tightened. Professional installation by a watchmaker is recommended.
| Aspect | Guidance |
|---|---|
| Inspection Period | Inspect intermediate wheel teeth for wear or deformation during each movement service |
| Wear Indicators | Signs of wear include: unstable movement operation, unusually low amplitude, increased time deviation, reduced automatic winding efficiency |
| Cleaning Method | Use specialized cleaning solution and ultrasonic equipment; avoid corrosive cleaners |
| Lubrication | Apply specialized watch oil to intermediate wheel pivots – microscopic amount only; gear teeth typically require no lubrication |
| Replacement Interval | Replace immediately if teeth are worn, missing, or deformed |
| Service Advice | ETA 2824/2834/2836 movements should be professionally serviced every 3-5 years |
Q1: Which ETA movements use the 203 intermediate wheel?
A: The 203 intermediate wheel is used in ETA 2824-2, 2834-2, and 2836-2 movements. These are among the most common Swiss automatic calibers, found in many watch brands including Tissot, Longines, Hamilton, Mido, Certina, and countless others.
Q2: What is the difference between the 203 intermediate wheel and the 210 third wheel?
A: The intermediate wheel (203) is positioned between the seconds wheel and the escape wheel. The third wheel (210) is positioned between the center wheel and the seconds wheel . They serve different positions in the gear train and are not interchangeable.
Q3: What is the Article number for this part?
A: The Article number for the 203 intermediate wheel is 10. This is ETA‘s internal reference number used for parts ordering and identification within the ETA parts catalog.
Q4: Is this part compatible with ETA 2824 (non-2 version)?
A: The 2824-2 is the modern version of the caliber. While many parts are similar, it is recommended to use this part for 2824-2, 2834-2, and 2836-2 movements specifically. For older 2824 (non-2) movements, verify compatibility with a parts guide or professional.
Q5: What are the symptoms of a worn intermediate wheel?
A: Symptoms include: unstable movement operation, low amplitude (the balance wheel doesn‘t swing fully), increased time deviation, reduced power reserve, or the watch stops intermittently.
Q6: Can I install this intermediate wheel myself?
A: This repair requires complete movement disassembly, specialized tools (screwdrivers, tweezers, oilers), and experience with the 2824 gear train. Professional installation by a qualified watchmaker is strongly recommended.
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