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This is a genuine TMI/Seiko VK63 movement minute wheel, an original Japanese-made component for the popular VK63 meca-quartz chronograph movement. As part of the chronograph module, this wheel drives the 60-minute counter subdial (typically at 12 o’clock), ensuring accurate elapsed time measurement.
This brand new original part is essential for watchmakers restoring proper chronograph function when the original wheel becomes worn or damaged.
About the VK63 Movement
The Seiko VK63 is a popular meca-quartz chronograph movement that combines quartz timekeeping with a mechanical chronograph module. Key specifications include :
| Specification | Details |
|---|---|
| Caliber | VK63 / VK63A |
| Type | Quartz (meca-quartz) |
| Size | 13 1/2‴ (30.80mm × 29.10mm) |
| Height | 5.10mm |
| Battery | 394 |
| Hand Sizes | 1.50mm / 0.90mm / 0.32mm |
| Functions | Hours, minutes, small seconds, date, central chronograph seconds, 60-minute counter, 24-hour indicator |
The minute wheel is part of the chronograph module and works in conjunction with the chronograph second hand and hour counting wheel.
Chronograph Operation on VK63 :
| Operation | Button | Function |
|---|---|---|
| Start | Press button (A) | Chronograph second hand starts moving |
| Stop | Press button (A) again | Chronograph hands stop to indicate elapsed time |
| Reset | Press button (B) | All chronograph hands reset to zero position |
Signs of Minute Wheel Wear:
60-minute counter does not advance when chronograph is running
Counter advances erratically or jumps multiple steps
Counter fails to reset to zero position
Unusual noise or grinding during chronograph operation
Proper Handling Tips:
Use non-metallic tweezers when handling the wheel to avoid damaging the teeth
Keep the pivot ends clean and free of old oil
The chronograph can measure up to 60 minutes; after 60 minutes it stops automatically
Tools Required:
Non-metallic tweezers
Screwdrivers (appropriate sizes for chronograph module disassembly)
Movement holder
Loupe or microscope (10x recommended)
Rodico cleaning putty
Step-by-Step Installation:
Step 1: Movement Preparation
Remove the movement from the watch case
Remove the hands and dial
Remove the chronograph module to access the wheel train
Step 2: Remove the Old Minute Wheel
Locate the minute counting wheel in the chronograph module (typically near the 12 o’clock subdial position)
Using non-metallic tweezers, carefully lift the old minute wheel from its pivot
Note the orientation and any washers or spacers
Step 3: Inspect and Clean
Inspect the hour counting wheel and intermediate wheels for signs of wear
Clean the pivot area using Rodico to remove old oil and debris
Check that all teeth are intact on the new wheel
Step 4: Install the New Minute Wheel
Position the new genuine Seiko minute wheel onto its pivot post
Ensure the wheel sits flush and engages properly with the intermediate wheels
The wheel should rotate freely but with minimal play
Step 5: Lubrication
Apply a small amount of appropriate watch lubricant to the pivot (use minimal oil)
Avoid over-lubrication, which can attract dust
Step 6: Reassembly and Testing
Reinstall the chronograph module
Reinstall the dial and hands
Test chronograph function: start, run for 60 seconds, stop, reset
Verify the 60-minute counter advances correctly
Important Notes:
The VK63 chronograph module contains multiple small parts – handle with care to avoid losing components
After battery replacement, the movement may need to be reset using conductive tweezers
Professional installation is strongly recommended for those without movement service experience
Common Symptoms of Minute Wheel Wear:
| Symptom | Possible Cause |
|---|---|
| 60-minute counter does not advance | Worn minute wheel teeth or damaged engagement |
| Counter advances erratically | Worn teeth or debris in mechanism |
| Counter fails to reset | Worn engagement with reset mechanism |
| Chronograph runs but counter stays at zero | Disengaged or broken wheel |
Diagnostic Process:
Visual Inspection: Under magnification, examine the minute wheel teeth for wear, chipping, or deformation.
Function Test: Operate the chronograph while observing the 60-minute counter movement. Run for 1-2 minutes to verify advancement.
Reset Test: After stopping the chronograph, press the reset button (B) to verify the counter returns to zero.
When Replacement is Necessary:
Visible tooth damage or wear on the minute wheel
The wheel does not engage properly with adjacent components
The pivot is worn or bent
Previous repair attempts have failed
Preventive Maintenance:
Replace battery every 2-3 years to prevent leakage
Avoid operating the chronograph continuously for extended periods
Have the watch serviced by professionals every 3-5 years
When to Seek Professional Help:
You lack experience with chronograph module disassembly
Multiple components show signs of wear
The movement has other timing issues
You are uncertain about proper reassembly sequence
Q1: What is the function of the minute wheel in the VK63?
A: The minute wheel (part number 0902-017) is part of the mechanical chronograph module. It drives the 60-minute counter subdial (typically at 12 o‘clock), allowing the chronograph to measure elapsed time up to 60 minutes . When the central chronograph seconds hand completes one full rotation (60 seconds), this wheel advances the 60-minute counter by one minute.
Q2: Can I install this part myself?
A: This part requires disassembly of the chronograph module. The VK63 is a meca-quartz movement with a mechanical chronograph module that contains multiple small parts . Professional installation by a qualified watchmaker is strongly recommended. Improper installation can damage the chronograph mechanism or affect timing accuracy.
Q3: What other parts should I inspect when replacing the minute wheel?
A: Inspect the hour counting wheel, intermediate wheels, and the chronograph reset mechanism for wear. The VK63 chronograph module includes multiple interacting components . If the minute wheel shows wear, related components may also be affected. Also check the heart-shaped cam for the chronograph second hand.
Q4: What is the battery type for the VK63 movement?
A: The VK63 movement uses a 394 battery (also known as SR936SW). Battery life is typically 2-3 years depending on chronograph usage . After battery replacement, the movement may need to be reset using conductive tweezers .
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