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This is a genuine date jumper maintaining plate designed for the ETA 2824, 2834, and 2836 series automatic movements, with part number 2824-2595, Made in Switzerland, and brand new. This component is a dedicated clamping part in the movement‘s calendar module, used to secure the date jumper to the mainplate while also covering part of the date ring teeth to ensure precise positioning during date changes.
As an original factory part, it is the ideal choice for replacing worn or damaged components during service or repair.
| Feature | Description |
|---|---|
| Compatible Movements | ETA 2824-2, 2834-2, 2836-2 and derived calibers |
| Part Name | Date Jumper Maintaining Plate / Calendar Clamp Plate |
| Part Number | 2824-2595 (also listed as 2824.2595) |
| System | Date Display Module |
| Core Function | Secures the date jumper to the mainplate and assists in covering/holding part of the date ring teeth |
| Material | High-precision steel with electroplated finish |
The date jumper maintaining plate and the date jumper work as a matched pair. Replacing only the jumper without also replacing the maintaining plate may result in insufficient tension on the new jumper, affecting the reliability and crispness of the date change.
1. Remove Calendar Module Remove the movement, take off the automatic module and minute train bridge to expose the calendar module
2. Remove Old Part Loosen the fixing screws and carefully remove the old date jumper maintaining plate (2824-2595)
3. Inspect & Remove Old Jumper Check the old date jumper and remove it (recommend replacing the matching jumper, part 2576, at the same time)
4. Clean Mounting Area Clean the maintaining plate slot and contact surfaces – remove old oil and debris
5. Install New Jumper Place the new date jumper into the positioning slot, ensuring the locating post is fully seated
6. Install New Maintaining Plate Place the new maintaining plate (2824-2595) in position, ensuring its edge evenly covers the date ring teeth
7. Tighten Screws Use a precision screwdriver to tighten the screws – moderate torque, ensure the plate sits flat without tilting
8. Test Date Function Manually rotate the crown to test smooth and crisp date changes – verify correct date alignment
9. Final Check Ensure the plate is flush and screws are properly tightened before proceeding with assembly
Important Notes:
In the ETA 2824, the date wheel and the date jumper maintaining plate are riveted together as a single assembly – the maintaining plate will not separate. Install as one piece and ensure proper gear meshing.
Tighten screws moderately – over-tightening may deform the plate or bind the calendar train; under-tightening may allow the plate to shift.
| Aspect | Guidance |
|---|---|
| Inspection Period | Inspect the date jumper maintaining plate for deformation or loose screws during each movement service |
| Wear Indicators | Signs include: vague date change, misaligned date window display, uneven jumper spring release |
| Cleaning Method | Use specialized cleaning solution and ultrasonic equipment – avoid corrosive cleaners |
| Lubrication | Do not lubricate the maintaining plate itself – only apply microscopic oil to jumper-date ring contact points |
| Replacement Interval | Replace immediately if deformed, screw holes are stripped, or fit with the jumper is poor |
| Service Advice | ETA 28xx series movements should be professionally serviced every 3-5 years – replace the jumper and maintaining plate together as needed |
Q2: Why does the date jumper maintaining plate cover the date ring teeth?
A: The plate‘s edge covers part of the date ring teeth to prevent the date ring from lifting upward during movement operation. This ensures stable positioning and crisp date changes.
Q3: Can I replace the date jumper without replacing the maintaining plate?
A: Technically yes, but it is strongly recommended to replace both together. The maintaining plate also experiences wear over time, and new jumper+old plate may not provide optimal tension or alignment.
Q5: What happens if the maintaining plate screw is over-tightened?
A: Over-tightening can deform the maintaining plate, causing it to press unevenly on the date ring or bind the jumper spring. This may result in stiff or failed date changes. Always tighten screws moderately and evenly.
Q6: Can I install this part myself?
A: This replacement requires movement disassembly and careful alignment of the calendar module. If you have experience with watch movement service and proper tools, it is possible. However, professional installation by a watchmaker is strongly recommended for those without experience.
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