Introduction
This manual provides essential instructions for the proper setup, operation, and maintenance of your Master Lock 6421LJWO Keyed Padlock. Please read these instructions carefully before using the product to ensure optimal performance and security.
An image of the Master Lock 6421LJWO Keyed Padlock, featuring a black rectangular body and a silver U-shaped shackle.
Setup
Package Contents
- One Master Lock 6421LJWO Keyed Padlock
- Two operating keys
Initial Inspection
Before first use, inspect the padlock for any signs of damage. Ensure the shackle moves freely and the key inserts smoothly into the keyway. Verify that the provided keys operate the lock correctly.
Operating Instructions
Unlocking the Padlock
- Insert the key fully into the keyway.
- Turn the key clockwise approximately one-quarter turn (90 degrees).
- Pull the shackle upwards to open the padlock.
- Remove the key.
Locking the Padlock
- Align the shackle with the padlock body.
- Push the shackle firmly downwards until it clicks into place.
- Ensure the shackle is securely locked by attempting to pull it open without the key.
- The key can be removed only when the padlock is in the locked position.
Maintenance
Lubrication
To ensure smooth operation and prolong the life of your padlock, periodically apply a small amount of graphite lubricant or a silicone-based lubricant to the keyway and shackle mechanism. Avoid using oil-based lubricants as they can attract dirt and debris, potentially hindering operation.
Cleaning
Wipe the padlock body with a clean, dry cloth to remove dirt and grime. For stubborn dirt, a mild soap solution can be used, followed by thorough drying to prevent corrosion.
Troubleshooting
Key is difficult to insert or turn
- Ensure the key is inserted correctly and fully into the keyway.
- Apply lubricant to the keyway as described in the Maintenance section.
- Check for any debris or foreign objects in the keyway that might be obstructing the key.
Shackle does not open or close smoothly
- Apply lubricant to the shackle mechanism where it enters the padlock body.
- Ensure the key is fully turned when attempting to open the shackle.
- Check for any physical obstructions preventing the shackle from moving freely.
Lost Keys
If keys are lost, contact Master Lock customer support for assistance. Note that this model uses a unique key for each padlock, and replacement keys may require specific information about your lock, such as the key code if available.
Specifications
| Brand | Master Lock |
| Model Number | 6421LJWO |
| Lock Type | Key Lock |
| Body Material | Steel (Laminated Finish) |
| Shackle Material | Boron |
| Shackle Diameter | 5/16 inch |
| Shackle Height | 2 1/2 inches |
| Shackle Width | 7/8 inch |
| Body Dimensions (H x W x T) | 2 13/32 in (Height) x 2 1/8 in (Width) x 1 5/16 in (Thickness) |
| Color | Black |
| Key Type | Different (Unique Key) |
| Weather Resistant | Yes |
| Rekeyable | Yes |
| UPC | 071649074257 |
Warranty Information
Master Lock products are manufactured to demanding standards and are warranted to be free from defects in workmanship and materials for the life of the product. This warranty does not cover product abuse, modification, or improper installation. If you experience any issues, please refer to the support section or visit the official Master Lock website for detailed warranty terms and conditions.
Support
For further assistance, product registration, or to view frequently asked questions, please visit the official Master Lock website:
You may also contact Master Lock customer service directly through their website for personalized support regarding your 6421LJWO Keyed Padlock.
