Master Lock 5420EC Portable Lock Box User Manual

1. Introduction

This manual provides instructions for the setup, operation, and maintenance of your Master Lock 5420EC Portable Lock Box. This device is designed to securely store keys and access cards, offering convenient access for authorized individuals while protecting against unauthorized entry. Its adjustable shackle allows for versatile attachment to various fixtures.

2. Safety Information

• Ensure the lock box is securely attached to a stable fixture to prevent accidental falls or theft.
• Do not force the combination dials if they are stiff; refer to the troubleshooting section.
• Keep the combination confidential and store it in a safe, memorable location separate from the lock box.
• This product is designed for key and access card storage; do not store valuables or sensitive documents.
• Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

3. Package Contents

Verify that all items are present in your package:

• Master Lock 5420EC Portable Lock Box (1 unit)
• Owner's Manual (this document)

4. Setup

4.1. Setting Your Combination

The lock box comes with a factory default combination (usually 0-0-0-0). You must set your own unique 4-digit combination for security.

1. Open the lock box by entering the current combination (factory default is 0-0-0-0) and pushing down the black lever to open the compartment door.
2. Locate the reset lever on the inside of the compartment door. Push the reset lever to position A (usually to the left and up).
3. Rotate the dials to your desired new 4-digit combination. Choose a memorable but secure combination.
4. Push the reset lever back to position B (usually down and to the right) to lock in your new combination.
5. Scramble the dials and close the compartment door. Your new combination is now set.

Image: Detailed steps showing how to set a new combination for the lock box.

4.2. Attaching the Lock Box

The adjustable shackle allows for attachment to various door knobs, handles, and levers.

1. With the compartment door open, locate the shackle release button inside the box.
2. Push the shackle release button and pull the shackle upwards and out of the lock box.
3. Place the shackle around the desired door knob, handle, or lever.
4. Reconnect the shackle to the lock box, ensuring it clicks into place. Close the compartment door.

Image: Visual guide demonstrating how to attach the lock box to a door handle using the adjustable shackle.

Image: Illustration showing the lock box's compatibility with different door knob, handle, and lever styles.

5. Operating Instructions

5.1. Opening the Lock Box

1. Rotate the combination dials to your set 4-digit combination.
2. Push down the black lever located below the dials. The compartment door will spring open.

5.2. Storing Keys and Access Cards

The internal compartment is designed to hold multiple keys and key fobs.

• Place your keys, key fobs, or access cards inside the compartment.
• Ensure items are placed neatly to allow the door to close completely.

Image: Demonstrates the secure storage of keys and key fobs within the lock box, contrasting with insecure methods.

5.3. Closing and Locking the Lock Box

1. Gently push the compartment door closed until it latches securely.
2. Scramble the combination dials to lock the box and prevent unauthorized access.

6. Maintenance

• Regularly wipe the exterior of the lock box with a soft, damp cloth to remove dirt and grime.
• The vinyl-coated shackle and molded bumper help prevent scratching; inspect them periodically for wear.
• The weather cover protects the combination dials from outdoor elements. Ensure it is properly seated after each use.
• Avoid using abrasive cleaners or solvents, as they may damage the finish.

7. Troubleshooting

7.1. Lock Box Will Not Open

• Ensure the correct 4-digit combination is entered. Double-check each dial.
• Confirm that the black lever is fully pushed down after entering the combination.
• If the dials are stiff, gently wiggle them while applying pressure to the lever. Extreme temperatures may affect operation.

7.2. Shackle is Difficult to Remove/Attach

• Ensure the compartment door is fully open before attempting to remove or attach the shackle.
• Verify that the shackle release button is fully depressed when manipulating the shackle.

8. Specifications

Image: Diagram illustrating the external and internal dimensions of the lock box.

9. Warranty and Support

9.1. Warranty Information

This Master Lock product comes with a Limited Lifetime Warranty. For specific details regarding warranty coverage and claims, please refer to the official Master Lock website or contact their customer support.

9.2. Customer Support

For further assistance, troubleshooting, or product inquiries, please visit the official Master Lock website or contact their customer service department. Contact information can typically be found on the product packaging or the manufacturer's website.

You can also visit the Master Lock Store on Amazon for more product information and support resources.