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This is a genuine cannon pinion with integrated driving wheel for the Sellita SW300 self-winding movement, part number SW300-242 in height H1. This combined component transmits power from the center wheel to the minute hand and, in conjunction with the hour wheel, drives the hour hand.
As a core component of the movement’s gear train, this part is an ideal replacement for worn or damaged original components during service or repair.
| Feature | Description |
|---|---|
| Compatible Movement | Sellita SW300 self-winding mechanical movement |
| Part Number | SW300-242 |
| Height Specification | H1 (specific height version for different movement batches or case heights) |
| Construction | Integrated cannon pinion and driving wheel |
| Core Function | Transfers power from the center wheel to the minute hand; works with the hour wheel to drive the hour hand |
| Material | High-strength hardened steel, precision machined |
| Product Type | Genuine Sellita part |
| Step | Instruction |
|---|---|
| 1. Disassembly | Remove the dial and hour wheel to expose the cannon pinion. Use a specialized tool to gently pull out the old cannon pinion |
| 2. Cleaning | Clean the center wheel pivot and cannon pinion mounting area to remove old oil residue or metal debris |
| 3. Inspection | Check the fit between the cannon pinion and center wheel, as well as the meshing of the hour wheel with the cannon pinion |
| 4. Installation | Vertically align the new cannon pinion assembly (SW300-242) with the center wheel pivot and press evenly into place until flush with the mainplate |
| 5. Lubrication | Apply specialized watch lubricant (e.g., Moebius oils) to the contact points between the cannon pinion and center wheel. Use extremely small amounts |
| 6. Testing | After reinstalling the hour wheel and dial, manually rotate the crown to verify that the hands move smoothly without jumping or sticking |
| Note | Details |
|---|---|
| H1 Height Confirmation | The SW300-242 is available in different height versions (H1, H2, etc.). Verify that your original cannon pinion is H1 height before installation, otherwise the hand height or dial fit may be incorrect |
| Genuine Part | This is a genuine Sellita part, not a generic replacement, with strict tolerances |
| Friction Fit | Proper friction between the cannon pinion and center wheel is critical. Too loose will cause hands to slip; too tight will increase resistance in the gear train |
| Professional Installation | Professional installation by a watchmaker is recommended. Improper handling may damage the center wheel pivot or mainplate |
| Simultaneous Replacement | If the cannon pinion is worn, it is recommended to inspect and replace the hour wheel at the same time to ensure proper meshing |
| Aspect | Guidance |
|---|---|
| Inspection Period | Check the friction fit and gear wear between the cannon pinion and center wheel during each movement service |
| Wear Indicators | Signs of wear include: jumping minute hand during time setting, hand slippage, or incorrect hand positioning |
| Cleaning Method | Clean with isopropyl alcohol or specialized cleaning solution; do not soak. Ensure complete drying after cleaning |
| Lubrication | Apply specialized lubricant to the contact surfaces between the cannon pinion and center wheel in microscopic amounts; gear teeth typically require no lubrication |
| Height Matching | Always verify the height version (H1) when replacing. Incorrect installation height can damage the dial or hands |
Q1: What does “H1” mean in SW300-242 H1?
A: H1 refers to the height specification of the cannon pinion. Different movements or case configurations require different cannon pinion heights to ensure proper hand clearance and dial fit. H1 is one of the standard heights for the SW300 movement.
Q2: Is this part compatible with ETA 2892 movements?
A: The Sellita SW300 is a clone of the ETA 2892, but parts are not always fully interchangeable. While some dimensions may match, it is recommended to use this genuine Sellita part for SW300 movements and ETA parts for ETA movements to ensure proper fit.
Q3: What are the symptoms of a worn cannon pinion?
A: Worn cannon pinion symptoms include: the minute hand jumps or moves unevenly when setting the time, the hands slip when the crown is pulled, or the time setting feels loose and imprecise.
Q4: Can I install this cannon pinion myself?
A: This repair requires movement disassembly and precise alignment. It is recommended to have a professional watchmaker perform the installation.
Q5: Do I need to lubricate the cannon pinion?
A: Yes, the contact surface between the cannon pinion and the center wheel requires a microscopic amount of specialized watch lubricant. Do not over-lubricate, as excess oil can migrate to other parts of the movement.
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