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"Can I change the combination on my mechanical safe lock?"


We get this question from time to time, and the answer is yes you can, but they are tricky if you haven't done it before and know what you are doing.


Getting it wrong means you'll have to take the back of the lock body off and re-align the entire mechanism. Plus, regardless if you successfully change it or not, you void any factory warrant the lock has.


It's a detailed process and we really, really recommend you have a locksmith do this for you. That being said, if you still want to attempt it, the instructions are below.


Disclaimer: T&T Liberty Safes is providing the instructions given by Sargent & Greenleaf for models 6741 and 6730, both models used by Liberty safes. We are not responsible for any issues that arise from someone attempting to change their lock combination on their own.


S&G Models 6741 and 6730

The combination must be three numbers. The last number must be between 11 and 89. Having the last number between 90 and 10 can cause the lock to not engage during the last step to open it.


A suggestion: It's best not to select a combination like your birthday or anniversary, or another predictable number that someone that has your personal information can guess.


You need a Sargent & Greenleaf change key. Make sure you have the right change key for the lock on your safe.


Note that there are two "notches" on the ring around the dial (shown on the diagram). The one at the 11 o'clock position is called the Changing Index and the one at the 12 o'clock position is called the Opening Index. Remember these terms while following the instructions.


1) Using the existing combination on the Opening index, unlock the combination lock and open the safe door. With the safe door now open, turn the handle and lock the safe open with the bolts out.

2) Take the back panel of the safe door off to gain access to the lock body, located inside the door behind the front dial.

3) Dial the existing combination again, this time using the Changing Index. When you get to the third number, keep the third number aligned on the Changing Index.

4) Insert the change key into the key hole located on the back of the lock body. The change key must be completely inserted.

5) Rotate the change key 90 degrees.

6) Enter your new three number combination using the Changing Index, dialing as follows:

• Turn the dial left (counter clockwise) until the first number aligns with the Changing Index the fourth time.

• Turn the dial right until the second number aligns with the Changing Index the third time.

• Turn the dial left until the third number aligns with the Changing Index the second time.

• Turn the dial right exactly 10 numbers.

7) Rotate the change key 90 degrees, and remove it from the back of the lock body.

8) Using the Opening Index, check the new combination at least three times to be sure that it works consistently. Be sure to rotate the handle as you test the combination to be sure the entire door mechanism is working as intended.

9) If all is working correctly, then replace the door panel on the back of the door.