Sargent & Greenleaf (S&G) combo locks are renowned for their reliability and security in safes and vaults. These locks combine durability with advanced features for superior protection. Model 2740, 2937, and 6700 series are popular choices, offering both electronic and mechanical operation. Known for their precise engineering, S&G locks ensure secure access control. This guide provides detailed instructions for setting up, maintaining, and troubleshooting these locks effectively. Master codes, combination changes, and reset procedures are covered to help users manage their locks confidently. Whether for residential or commercial use, S&G combo locks deliver unmatched security and convenience. Understanding their operation ensures optimal performance and long-term reliability. Follow these instructions to maximize the security and functionality of your S&G combo lock. Proper maintenance and regular checks are essential to uphold their integrity and ensure seamless operation over time. This comprehensive guide addresses common questions and provides step-by-step solutions for all S&G combo lock models.

Factory Default Combination

The factory default combination for Sargent & Greenleaf (S&G) combo locks is typically set to 1-2-3-4-5-6. This standard combination is programmed during manufacturing and is intended for initial setup and testing. For electronic models like the 6120, 6123, and Z02, entering 123456 will also open the lock. It is crucial to change this default combination immediately after the first use to ensure maximum security. Users can dial the factory combination directly to access the lock before making any changes. If the lock is reset or reverted, the default combination will be restored. Always ensure the door is open and the handle is in the correct position before attempting to use the factory combination. For specific models, such as the 2740, the default combination may vary slightly, so refer to the model-specific instructions. Remember, using the factory combination long-term can compromise security, so updating it is highly recommended.

Changing the Combination

To change the combination on an S&G lock, dial the existing combination to the change mark. Set the new combination by turning the dial and ensuring the third number aligns correctly. Test the new combination three times for confirmation.

• Dial the current combination to the change mark.
• Set the new combination and align the third number.
• Test the new combination three times to confirm.

3.1. Locating the Change Key

The change key is essential for initiating the combination change process on S&G combo locks. It is typically located on the back of the dial or attached to the lock’s documentation. For models like the 2740 and 6700 series, the change key may be stored in a compartment near the dial or provided separately during installation. Ensure the lock is open and the dial is accessible before proceeding. If the key is missing, refer to the lock’s manual or contact a professional. Once located, insert the key into the designated slot and turn it clockwise to unlock the combination mechanism. This step prepares the lock to accept a new combination. Always store the change key securely to prevent unauthorized access. If unsure, consult the specific model’s instructions or the manufacturer’s guidelines for assistance.

3.2. Dialing the Existing Combination

Dialing the existing combination is a critical step in the process of changing the combination for your S&G combo lock. Begin by ensuring the lock is in the open position and the dial is free to rotate. Turn the dial clockwise at least four full rotations to clear any previous entries. Stop at the first number of the current combination, ensuring the dial is aligned with the mark. Next, rotate the dial counterclockwise to the second number, aligning it precisely with the mark. Finally, turn the dial clockwise to the third number, stopping exactly at the change mark. It is crucial to be accurate, as misalignment may prevent the mechanism from engaging. Once the correct combination is entered, the lock will open, and the mechanism will be ready for the new combination to be set. Avoid forcing the dial, as this could damage the internal components.

3.3. Setting the New Combination

After successfully dialing the existing combination, you can proceed to set the new combination. Rotate the dial clockwise to the first number of the new combination, ensuring it aligns precisely with the change mark. Continue by turning the dial counterclockwise to the second number, and then clockwise to the third number, aligning each with the change mark. For electronic models, enter the new combination using the keypad. Once the new combination is entered, the lock will typically click or provide an audible signal indicating the change has been accepted. To confirm, open and close the lock using the new combination. For models with a reset button, press and hold it while entering the new combination. Always refer to the specific model’s instructions for any unique procedures. Testing the new combination multiple times ensures it works correctly. Proper alignment and precise dialing are crucial for the mechanism to function smoothly.

3.4. Testing the New Combination

Testing the new combination is essential to ensure it works correctly and provides secure access. Start by dialing the new combination precisely, aligning each number with the change mark. For electronic models, enter the combination using the keypad and listen for a confirmation tone or click. Open the lock to verify access. Repeat this process at least three times to confirm consistency. If the lock fails to open, double-check the combination and dialing sequence. For mechanical locks, ensure the dial stops at each number accurately. After successful testing, close the lock and test it again to confirm it secures properly. Proper testing ensures the combination is set correctly and the lock functions as intended. This step is critical for maintaining security and avoiding future issues. Always document the new combination securely to prevent loss. Testing under different conditions can also help identify any potential issues early.

Using the Management Reset Code (MRC)

The Management Reset Code (MRC) is used to regain control of the lock when the master code is lost. Enter the MRC to reset the lock to factory defaults, removing all user codes. This feature ensures access recovery but requires reprogramming the combination afterward. Use the MRC cautiously, as it erases all existing codes and restores the lock to its factory default combination. Always document the MRC securely to prevent unauthorized access. The MRC process varies by model, so refer to specific instructions for your S&G lock. This step is critical for maintaining security and ensuring proper functionality after a reset.

4.1. When to Use the MRC

The Management Reset Code (MRC) is a critical feature for regaining access to your S&G combo lock when the master code is forgotten or lost. It is specifically designed for situations where the master code has been misplaced or compromised, rendering the lock inaccessible. Use the MRC when you cannot open the lock with the existing combination or master code. This code is also useful in cases where multiple incorrect attempts have locked the device, requiring a reset to restore functionality. The MRC does not change the combination but instead resets the lock to its factory default combination, allowing you to start over. However, using the MRC will erase all previously set user codes, so it should only be employed when absolutely necessary. Always use the MRC with caution and ensure it is stored securely to prevent unauthorized access. This feature is a last-resort solution for maintaining control of your lock;

4.2. Steps to Apply the MRC

To apply the Management Reset Code (MRC), follow these steps carefully:
Ensure the lock is in its default state or has been inactive for at least 10 seconds.
Enter the MRC by dialing or pressing the corresponding numbers on the keypad.
Press the “Enter” or “Set” button to activate the reset process.
The lock will confirm the reset with a beep or visual indicator.
Once reset, the lock will revert to its factory default combination (e.g., 1-2-3-4-5-6).
Immediately set a new master code and test it to ensure functionality.
The MRC does not change the combination but resets the lock to its default state, allowing you to regain access and reprogram it. Use this feature only when necessary, as it erases all previous user codes. Always store the MRC securely to prevent unauthorized resets. After applying the MRC, verify the new combination works correctly before closing the safe or vault. This ensures the lock operates smoothly and maintains its security features.

Specific Models

Model 2740, 2937, and 6700 series are popular S&G combo locks, each offering unique features. Model 2740 is known for its electromechanical design, while Model 2937 focuses on precise dial operation. The 6700 series excels with its electronic keypad and durability, making it ideal for high-security applications. These models cater to different security needs, ensuring reliable performance across various settings. Understanding their specific functionalities helps users choose the right lock for their requirements. Each model is designed to provide advanced security features while maintaining ease of use. Proper setup and maintenance are crucial for optimal performance. This guide covers detailed instructions for each model, ensuring users can fully utilize their capabilities. By following the model-specific instructions, users can maintain security and functionality effectively.

5.1. Model 2740 Instructions

The S&G Model 2740 is a popular electromechanical safe lock designed for high-security applications. To operate it, start by turning the dial left to clear any previous attempts. Stop at the first number of the combination, then turn right to the second number, and left again to the third. Open the lock by turning the handle. If the combination is lost, the lock can be reset using the Management Reset Code (MRC). Enter the MRC, press “B,” and follow the prompts to set a new combination. The factory default combination is 1-2-3-4-5-6, but it’s recommended to change it for enhanced security. After ten incorrect attempts, the lock shuts down temporarily. Regular maintenance, such as cleaning and lubricating the dial, ensures smooth operation. Always test the new combination three times before securing the safe. Refer to the troubleshooting section for resolving common issues. Proper care extends the lock’s lifespan and reliability.

5.2. Model 2937 Instructions

The S&G Model 2937 is a high-security combination lock designed for secure storage applications. Installation requires careful mounting of both the lock and dial ring, ensuring proper alignment. The factory default combination is 1-2-3-4-5-6, but it’s essential to change it for security. To set a new combination, dial the existing code, stop at the change mark, and enter the new sequence. For locks with a splined spindle, avoid setting the third number between 0 and 20. After changing, test the new combination three times before closing the safe. Regular maintenance, such as cleaning the dial and lubricating the mechanism, ensures smooth operation. If issues arise, refer to the troubleshooting section for solutions. The Model 2937 is known for its durability and reliability, making it a trusted choice for protecting valuable items. Proper installation and maintenance are key to its long-term performance and security. Always follow the provided instructions to ensure optimal functionality.

5.3. Model 6700 Series Instructions

The S&G Model 6700 Series offers advanced security features and user-friendly operation. To operate, turn the dial left at least four times to clear any previous attempts. Enter your combination by turning right, stopping at each number. After the last number, turn the dial left to the change mark and open the safe. For combination changes, dial the existing code, stop at the change mark, and enter the new sequence three times for confirmation. The factory default combination is 1-2-3-4-5-6, but it’s crucial to set a unique code. If the lock is inactive for ten seconds, it resets automatically. Regular maintenance, such as cleaning the dial and lubricating the mechanism, ensures smooth operation. The Model 6700 Series is known for its reliability and modern design, making it ideal for secure storage needs. Always follow the provided instructions to maintain its performance and security. Proper care extends its lifespan and ensures consistent functionality;

Resetting the Lock

The lock automatically resets after ten seconds of inactivity or incorrect attempts. To manually reset, dial the correct combination and turn the handle to ensure proper locking mechanism engagement.

6.1. Automatic Reset Due to Inactivity

The S&G combo lock features an automatic reset mechanism that activates due to inactivity or incorrect combination attempts. If no input is detected for ten seconds, the lock resets, requiring the user to start the dialing process over. This feature enhances security by preventing unauthorized access after a period of inactivity. If an incorrect combination is entered, the lock will also reset automatically, ensuring that the mechanism remains secure. Users must re-enter the correct combination from the beginning after any reset. This automatic reset is designed to protect the lock from tampering and ensures that only authorized individuals can access the contents. It is important to understand this feature to avoid unnecessary delays when operating the lock. Regular testing of the combination can help maintain familiarity with the lock’s behavior and ensure smooth operation. Always allow the lock to reset fully before attempting a new entry for optimal performance;

6.2. Manual Reset Procedure

The manual reset procedure for an S&G combo lock is essential when the lock needs to be reset due to incorrect entries or inactivity. To initiate the manual reset, ensure the lock is in an open position. Enter the Management Reset Code (MRC) by dialing or pressing the corresponding numbers on the keypad. After entering the MRC, turn the dial to the left and stop at the “change mark” indicated on the dial ring. This step aligns the internal mechanism to accept a new combination. Once aligned, you can set a new combination by following the standard change procedure. It is crucial to test the new combination immediately after resetting to ensure it functions correctly. If the lock does not respond, repeat the process carefully. The manual reset ensures the lock is ready for reprogramming and maintains its security features. Always refer to the MRC and follow instructions precisely to avoid further issues. Proper execution of this procedure ensures the lock operates smoothly afterward.

Battery Replacement

Battery replacement is a crucial maintenance task for S&G combo locks, particularly for electronic models like the 6120 and 6700 series. These locks rely on battery power to operate their electronic features. To replace the batteries, open the lock and locate the battery compartment, usually found on the back or underside of the dial. Remove the old batteries and insert new ones, ensuring the correct polarity. Most models require standard alkaline batteries, such as AA or AAA. After replacing, test the lock by entering the combination to confirm proper operation. Regular battery checks are recommended to prevent lockout due to low power. Always refer to the owner’s manual for specific instructions, as procedures may vary slightly between models. Proper battery maintenance ensures uninterrupted access and optimal performance of your S&G combo lock. Neglecting this can lead to security issues, so stay proactive with battery replacements.

Maintenance Tips

Regular maintenance ensures optimal performance of S&G combo locks. Clean the dial and internal mechanisms periodically to prevent dust buildup. Lubricate moving parts with silicone-based spray for smooth operation. Avoid harsh chemicals, as they may damage components. Use a soft cloth to wipe down surfaces. Regularly inspect the battery terminals for corrosion and ensure secure connections. Check the torque settings on wheel packs to maintain proper alignment. Always refer to the manufacturer’s guidelines for specific maintenance recommendations tailored to your lock model. Proper care extends the lifespan and reliability of your S&G combo lock, ensuring secure and consistent functionality over time. Schedule routine maintenance to avoid potential issues and maintain peak performance. Regular upkeep is key to preserving the lock’s integrity and security features. Stay proactive to ensure your lock operates flawlessly for years to come.

8.1. Cleaning the Dial

Cleaning the dial of your S&G combo lock is essential for maintaining smooth operation and preventing dust or grime buildup. Use a soft, dry cloth to gently wipe the dial surface, removing any dirt or residue. For more stubborn marks, dampen the cloth slightly with water, but avoid soaking it to prevent moisture from entering the lock. Never use harsh chemicals, abrasive cleaners, or rough materials, as they may scratch or damage the dial finish. After cleaning, inspect the dial for any remaining debris, especially around the numbers and markings. Ensure the dial is completely dry before use to avoid corrosion or sticking. Regular cleaning helps maintain the dial’s responsiveness and ensures accurate combination entry. For best results, clean the dial every 3-6 months or as needed. Proper care prevents wear and tear, keeping your lock functioning like new.

8.2. Lubricating the Mechanism

Lubricating the mechanism of your S&G combo lock is crucial for ensuring smooth operation and extending its lifespan. Use a high-quality, silicone-based lubricant specifically designed for locks. Avoid using oil-based products, as they can attract dust and dirt, potentially jamming the mechanism. Apply a small amount of lubricant to the dial and spindle, gently turning the dial to distribute it evenly. Wipe off any excess lubricant with a clean, dry cloth to prevent residue buildup. Repeat this process every 12-18 months or when you notice sluggish dial movement. Proper lubrication ensures the lock’s internal components move freely, reducing wear and tear. Regular maintenance helps maintain the lock’s precision and reliability.

Security Features

S&G combo locks feature advanced anti-pick pins, hardened steel components, and tamper-resistant designs. They incorporate robust combination strength and anti-tamper mechanisms to ensure maximum security against unauthorized access and forced entry attempts.

9.1. Combination Strength

The combination strength of S&G combo locks is a critical security feature, ensuring protection against unauthorized access. These locks typically use a 6-number sequence, with the factory default often set to 1-2-3-4-5-6. Users are advised to change this default combination to a unique sequence for enhanced security. The locks support a wide range of combinations, allowing for high customization and strength. Certain models, such as the 2740, 2937, and 6700 series, may have specific guidelines for combination setup to maximize security. For example, some models recommend avoiding the third number being set between 0 and 20 if the dial has a splined spindle. This feature ensures that combinations are less predictable and harder to crack. Regularly updating the combination is recommended to maintain optimal security. The lock’s design also includes anti-pick pins and hardened components, further reinforcing its resistance to tampering and forced entry.

9.2. Anti-Tamper Mechanisms

S&G combo locks are equipped with advanced anti-tamper mechanisms to prevent unauthorized access and manipulation. These locks feature automatic shutdown after multiple incorrect combination attempts, ensuring heightened security. For instance, entering ten incorrect combinations in a row triggers a temporary lockout, further deterring potential breaches. Certain models, such as the 2740, incorporate wheel pack torque adjustments, which enhance resistance to picking and forced entry. Additionally, the locks are designed with hardened components and anti-pick pins, making them highly resistant to tampering tools. The dial/spindle assembly is securely screwed to the cam, ensuring mechanical integrity. These features collectively provide robust protection against physical and numerical attacks. Regular maintenance, such as lubricating the mechanism, also supports the lock’s anti-tamper capabilities. By combining these elements, S&G locks offer a formidable defense against unauthorized access, ensuring the security of valuable assets. These mechanisms are integral to the lock’s reliability and long-term performance.

Troubleshooting Common Issues

Common issues with S&G combo locks include incorrect combination attempts and lock shutdown after repeated failures. If the lock shuts down, wait 10 seconds before retrying. For mechanical issues, ensure the dial is properly aligned and the wheel pack torque is set between 16-24 inch-ounces. If the lock does not open after entering the correct combination, verify that the spindle is securely attached to the cam. Resetting the lock or re-entering the combination may resolve the issue. Always test the new combination multiple times to ensure reliability. If problems persist, refer to the specific model’s troubleshooting guide or contact a professional. Proper maintenance, such as lubricating the mechanism, can prevent recurring issues. Regular checks ensure smooth operation and long-term functionality. Addressing issues promptly helps maintain the lock’s security and performance.

10.1. Incorrect Combination Attempts

If you encounter issues with incorrect combination attempts, ensure the dial is properly aligned and the numbers are entered accurately. Model 2740 locks may shut down after 10 incorrect tries, requiring a 10-second wait before retrying. For mechanical locks, check if the wheel pack torque is set between 16-24 inch-ounces. If the combination still fails, verify that the spindle is securely attached to the cam. Electronic locks may require a master code reset or entering the management reset code (MRC) to regain access. Always test the combination multiple times after resolving the issue to ensure reliability. If the problem persists, refer to the specific model’s troubleshooting guide or contact a professional. Regular maintenance, such as lubricating the mechanism, can prevent recurring issues. Addressing incorrect combination attempts promptly helps maintain the lock’s security and functionality. Proper alignment and accurate entry are crucial for smooth operation.

10.2. Lock Shutdown After Incorrect Entries

If your S&G combo lock shuts down due to incorrect combination attempts, it is a security feature to prevent unauthorized access. For Model 2740 locks, entering 10 incorrect combinations in a row will trigger a temporary shutdown. Wait 10 seconds before attempting to enter the combination again. If the issue persists, try using the Management Reset Code (MRC) to regain access. Enter the MRC, followed by the master code, to reset the lock. After a shutdown, ensure the combination is entered accurately and the dial is properly aligned. If the lock remains unresponsive, check the battery level for electronic models or verify the mechanical linkage for proper function. Testing the combination multiple times after resolving the issue is recommended. Always refer to the specific model’s instructions for detailed reset procedures. Regular maintenance, such as cleaning and lubricating the mechanism, can help prevent recurring shutdowns. Addressing the issue promptly ensures the lock’s security and functionality are maintained. Proper operation and accurate entry are key to avoiding shutdowns.

Videos and Tutorials

For visual learners, videos and tutorials provide an excellent way to understand the operation of S&G combo locks. Platforms like YouTube offer detailed guides, such as those by Parkers Safes, demonstrating how to change combinations and replace batteries. Specifically, the 6700 series locks have overview videos showing dialing sequences and combination changes. These resources are ideal for users who prefer step-by-step visual instructions. Many tutorials cover both basic and advanced features, ensuring users can master their lock’s functionality. Videos often include troubleshooting tips and maintenance advice, such as cleaning the dial or lubricating the mechanism. Some channels also provide model-specific instructions, like for the 2740 or 2937 locks. Watching these videos can help users test new combinations confidently and avoid common mistakes. For those unsure about procedures, these tutorials are a valuable resource. Always check official S&G channels or reputable third-party sources for accurate and up-to-date information. Videos are a great supplement to written instructions, making complex tasks easier to follow. By watching these guides, users can ensure their locks are set up and maintained correctly. This visual learning approach enhances understanding and minimizes errors, ensuring the lock performs optimally. Videos are especially helpful for less experienced users, providing clarity and reassurance. They are a key resource for anyone looking to maximize the security and functionality of their S&G combo lock. Regularly reviewing these tutorials can also help users stay updated on best practices. Overall, videos and tutorials are an essential tool for mastering S&G combo locks.

Sargent & Greenleaf combo locks are highly reliable and secure, designed to protect valuable assets with ease. This guide has provided comprehensive instructions for setting up, maintaining, and troubleshooting these locks, ensuring optimal performance and security. Whether you’re using the Model 2740, 2937, or 6700 series, the steps outlined here will help you master their operation. From changing combinations to using the Management Reset Code, and from battery replacement to maintenance tips, this guide covers everything needed to manage your lock effectively. By following these instructions, users can ensure their S&G combo lock operates securely and efficiently. Proper care and regular checks will extend the life of your lock, maintaining its integrity and performance over time. With these insights, you can confidently secure your valuables, knowing your S&G combo lock is functioning at its best. Always refer to this guide for any questions or concerns about your lock’s operation.