1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Salsbury Industries 3790-5 replacement lock for 4C horizontal mailbox doors. Please read these instructions carefully before proceeding with installation or use to ensure proper function and longevity of the product.
2. Product Overview
The Salsbury Industries 3790-5 is a standard key lock designed as a direct replacement for 4C horizontal mailbox doors. Each lock unit is supplied with three unique keys. This product is intended for securing individual mailbox compartments.
Image showing the Salsbury Industries 3790-5 replacement lock, typically supplied with three keys per lock.
3. Package Contents
Verify that all components are present before beginning installation.
- 5 x Salsbury Industries 3790-5 Mailbox Locks
- 15 x Keys (3 keys per lock)
4. Installation
Tools Required: Depending on your specific mailbox door, you may need a screwdriver (Phillips or flathead), pliers, or a wrench.
- Remove Existing Lock:
a. Open the mailbox door. Locate the retaining nut or clip on the back of the existing lock cylinder.
b. Use appropriate tools to loosen and remove the retaining nut or clip.
c. Carefully slide the old lock cylinder out from the front of the mailbox door.
- Prepare New Lock:
a. Ensure the new Salsbury 3790-5 lock is in the unlocked position (if applicable, the cam should be free to rotate).
- Insert New Lock:
a. Insert the new lock cylinder through the hole in the mailbox door from the front.
b. Ensure the cam (the flat piece that rotates to secure the door) is oriented correctly to engage with the mailbox frame when locked.
- Secure New Lock:
a. From the inside of the mailbox door, place the retaining nut or clip onto the back of the new lock cylinder.
b. Tighten the retaining nut or secure the clip firmly, but do not overtighten, as this can damage the lock mechanism or the mailbox door.
- Test Functionality:
a. With the mailbox door open, insert a key and turn it to ensure the cam rotates freely and fully.
b. Close the mailbox door and test the lock by turning the key to the locked position. Attempt to open the door without the key to confirm it is securely latched.
c. Unlock the door and remove the key. Repeat with all provided keys to ensure they function correctly.
Important: If you encounter resistance or difficulty during installation, do not force components. Consult a professional or contact Salsbury Industries support.
5. Operation
To operate the Salsbury Industries 3790-5 mailbox lock:
- To Lock: Insert the key into the lock cylinder. Turn the key clockwise (typically 90 degrees) until the cam engages with the mailbox frame, securing the door. Remove the key.
- To Unlock: Insert the key into the lock cylinder. Turn the key counter-clockwise (typically 90 degrees) until the cam disengages from the mailbox frame. The door can now be opened. Remove the key.
Always ensure the key is fully inserted before turning to prevent damage to the key or lock mechanism.
6. Maintenance
The Salsbury Industries 3790-5 lock requires minimal maintenance to ensure reliable operation.
- Cleaning: Periodically wipe the exterior of the lock with a soft, damp cloth to remove dirt and grime. Avoid abrasive cleaners or solvents.
- Lubrication: If the key becomes difficult to turn or the lock feels stiff, apply a small amount of graphite lubricant or a silicone-based spray lubricant specifically designed for locks into the keyway. Do not use oil-based lubricants, as they can attract dust and debris.
- Key Care: Avoid bending or forcing keys. Store spare keys in a safe, accessible location.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Key will not insert fully or is difficult to insert. | Debris in keyway, bent key, incorrect key. | Check key for damage. Use compressed air to clear keyway. Ensure it is the correct key for the lock. Apply graphite lubricant. |
| Key turns but lock does not engage/disengage. | Cam is bent or misaligned, internal mechanism damage. | Inspect the cam for damage or obstruction. If damaged, the lock may need replacement. Contact support. |
| Lock is stiff or hard to turn. | Lack of lubrication, internal corrosion or wear. | Apply graphite or silicone-based lock lubricant into the keyway. Work the key gently. |
| Mailbox door does not close properly after lock installation. | Lock cam is misaligned or retaining nut is overtightened. | Re-check cam orientation during installation. Loosen retaining nut slightly and re-test. Ensure no obstructions. |
If troubleshooting steps do not resolve the issue, contact Salsbury Industries customer support for further assistance.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | 3790-5 |
| Brand | Salsbury Industries |
| Lock Type | Key Lock |
| Material | Metal |
| Recommended Use | Securing 4C horizontal mailbox doors |
| Quantity per Pack | 5 Locks |
| Keys per Lock | 3 |
| Total Keys | 15 |
| Item Weight | 1.4 pounds (for the 5-pack) |
| Package Dimensions | 2 x 2 x 1.5 inches |
| UPC | 820996628206 |
9. Warranty and Support
For information regarding product warranty, returns, or technical assistance, please contact Salsbury Industries directly. Refer to the official Salsbury Industries website or your purchase documentation for current contact details and warranty terms.
Salsbury Industries Contact: www.salsburyindustries.com
