1. Introduction
This manual provides comprehensive instructions for the Longines HYDROCONQUEST Automatic Dive Watch, model L37824566. Please read this manual carefully before using your watch to ensure proper operation and to maintain its performance and longevity. This watch features an automatic movement, a black dial, a silver-tone stainless steel case and bracelet, and is water-resistant up to 300 meters (1000 feet).
2. Safety Information
- Water Resistance: The watch is water-resistant to 300 meters. Ensure the crown is fully pushed in and screwed down (if applicable) before any contact with water. Do not operate the crown or pushers underwater.
- Temperature Extremes: Avoid exposing the watch to extreme temperatures (above 60°C / 140°F or below 0°C / 32°F) or sudden temperature changes.
- Magnetic Fields: Keep the watch away from strong magnetic fields (e.g., speakers, refrigerators, mobile phones, airport security scanners) as they can affect the accuracy of the automatic movement.
- Shocks: While robust, avoid severe impacts or shocks to the watch.
- Chemicals: Avoid contact with solvents, detergents, perfumes, and cosmetic products, which can damage the bracelet, case, or gaskets.
3. Components Overview
Familiarize yourself with the main components of your Longines HYDROCONQUEST watch:
- Crown: Used for winding, setting time, and setting date.
- Bezel: Unidirectional rotating bezel, typically used for timing dive durations.
- Dial: Displays time and date.
- Hands: Hour, minute, and second hands.
- Bracelet: Stainless steel bracelet with a security folding clasp.
- Case: Stainless steel case, 43mm diameter.
- Crystal: Scratch-resistant sapphire crystal.
Image 1: Front view of the Longines Hydroconquest watch, highlighting the dial, rotating bezel, and crown on the side. The stainless steel bracelet is also visible.
4. Setup
4.1 Initial Winding
Your Longines HYDROCONQUEST watch is equipped with an automatic mechanical movement. It is powered by the motion of your wrist. If the watch has stopped or its power reserve is low, it needs to be manually wound:
- Unscrew the crown (if it's a screw-down crown) by turning it counter-clockwise.
- Pull the crown out to position 1 (winding position).
- Turn the crown clockwise approximately 30-40 times. This will build up a sufficient power reserve.
- Push the crown back in and screw it down clockwise to ensure water resistance.
For daily wear, the natural motion of your wrist will keep the watch wound. If worn regularly (8-12 hours a day), manual winding should not be necessary.
4.2 Setting the Time
- Unscrew the crown (if applicable) and pull it out to position 3 (time setting position). The second hand will stop.
- Turn the crown clockwise or counter-clockwise to set the desired time. To avoid confusion between AM and PM, advance the hands until the date changes. This indicates midnight. Then set the correct time.
- Once the time is set, push the crown back to position 1 and screw it down clockwise to secure water resistance.
4.3 Setting the Date
Important: Do not set the date between 9 PM and 3 AM, as this can damage the movement. If you need to set the date during this period, first set the time outside this window (e.g., to 6 AM), then set the date, and finally reset the correct time.
- Unscrew the crown (if applicable) and pull it out to position 2 (date setting position).
- Turn the crown to set the correct date.
- Once the date is set, push the crown back to position 1 and screw it down clockwise to secure water resistance.
5. Operating the Watch
5.1 Using the Unidirectional Rotating Bezel
The Longines HYDROCONQUEST features a unidirectional rotating bezel, designed for timing events, particularly dive durations. It rotates only counter-clockwise to prevent accidental increases in elapsed time, which is a critical safety feature for divers.
- Before starting an event (e.g., a dive), align the zero marker (usually a luminous triangle) on the bezel with the minute hand.
- As time passes, the minute hand will indicate the elapsed time against the bezel's scale.
Image 2: A close-up view of the watch bezel, demonstrating how to align the zero marker with the minute hand for timing purposes.
5.2 Water Resistance
The watch is water-resistant to 300 meters (30 ATM / 1000 feet). This rating makes it suitable for professional marine activity and serious surface water sports, but not for saturation diving.
- Always ensure the crown is fully screwed down before exposing the watch to water.
- Do not operate the crown or pushers while the watch is wet or submerged.
- After contact with salt water, rinse the watch thoroughly with fresh water and dry it with a soft cloth.
6. Maintenance
6.1 Cleaning
To maintain the appearance of your watch:
- Clean the case and metal bracelet regularly using a soft cloth.
- For stubborn dirt, use a soft brush and soapy water, then rinse thoroughly with fresh water and dry carefully.
- Avoid using harsh chemicals or abrasive materials.
6.2 Service Intervals
Like any precision instrument, your Longines watch requires regular servicing to ensure optimal performance and longevity. It is recommended to have your watch inspected by an authorized Longines service center every 3 to 5 years. This service typically includes:
- Disassembly and cleaning of the movement.
- Replacement of worn components.
- Lubrication of the movement.
- Checking and replacing gaskets to ensure water resistance.
- Case and bracelet cleaning.
- Accuracy testing.
6.3 Water Resistance Checks
The water resistance of your watch is not permanent. Gaskets can deteriorate over time due to aging or exposure to chemicals. It is advisable to have the water resistance checked annually by an authorized service center, especially if the watch is frequently exposed to water.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch has stopped or is running slowly. | Insufficient power reserve. | Manually wind the watch by turning the crown clockwise 30-40 times (after unscrewing if applicable). Wear the watch regularly for 8-12 hours a day. |
| Watch is running too fast or too slow. | Exposure to strong magnetic fields; needs regulation. | Keep away from magnetic sources. If problem persists, consult an authorized Longines service center for demagnetization or regulation. |
| Date does not change at midnight. | Time is set to PM instead of AM, or vice-versa. | Advance the hour hand by 12 hours. Ensure the date changes around midnight. |
| Condensation under the crystal. | Loss of water resistance; sudden temperature change. | Immediately take the watch to an authorized Longines service center. This indicates moisture ingress which can damage the movement. |
8. Specifications
- Model Number: L37824566
- Movement Type: Automatic
- Case Material: Stainless Steel
- Case Diameter: 43 mm
- Case Thickness: 14 mm
- Dial Color: Black
- Crystal: Scratch-resistant Sapphire Glass
- Bracelet Material: Stainless Steel
- Band Width: 21 mm
- Clasp Type: Folding clasp with security release
- Water Resistance: 300 meters (30 ATM / 1000 feet)
- Special Features: Unidirectional rotating bezel, Luminous hands and markers, Date display
- UPC: 703200206264
9. Warranty and Support
9.1 Manufacturer's Warranty
Your Longines watch is covered by a manufacturer's warranty against manufacturing defects. The duration and terms of the warranty are specified in the warranty card provided with your watch. Please refer to this document for detailed information regarding coverage and exclusions. Keep your proof of purchase and warranty card in a safe place.
9.2 Customer Support
For any questions, service requests, or warranty claims, please contact an authorized Longines service center or visit the official Longines website for a list of service locations. Using unauthorized service providers may void your warranty.
Official Longines Website: www.longines.com