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Dial Combination Locks

Dial combination locks continue to be used in the safe industry in various markets. Three commonly used Dial locks on traditional plate and composite safes built by FireKing Security Group include the LaGard 3370, the S&G 6730 and the S&G 8550.

PDF LaGard 3370 Cut Sheet
PDF LaGard 3370 Operating Instructions
PDF LaGard 3370 Installation Instructions
PDF S&G 6700 Series Operating Instructions
PDF S&G 6700 Series Installation Instructions
PDF S&G 8550 Operation and Installation Instructions

Opening a Typical Dial Combination Safe

1. Turn the dial left past the first number 3 times and stop on the forth time.
2. Turn the dial right past the second number twice and stop on the third time.
3. Turn the dial left past the third number once and stop on the seond time.
4. Turn the dial right until the dial stops at the last number.
5. Turn the handle and open the door.

When a Combination Does Not Work

1. Run the combo with all numbers one number low. Example: Combo should be 50-25-50, run 49-24-49.
2. Try one number high.
3. Continue in 1/2 number increments up to 3 numbers off in either direction.
4. If the door opens using one of the above methods, check if the users tend to spin the dial rapidly. If so, this will cause tumbler wear and combo drift.
5. Once the door is opened, the combo should be changed and tested before being shut.
6. If the door cannot be opened, it must be drilled.

Changing the Combination on a LaGard Dial (3370)

1. The existing combo and a LaGard Gp 2 change key are required.
2. Open the safe door by dialing the existing combo.
3. With the door open verify that the dial stops between 90 and 100 on the opening index.
4. Dial the existing combo again on the changing index, stopping at the third number of the combo.
5. In the back of the door insert the change key. If the key does not insert the wheels are not properly aligned: repeat Step 4.
6. Turn the change key to the right until it stops (approx. 1/4 turn).
7. Leave the change key in the lock.
8. Prepare to create a new combo of three numbers. Caution: Never use a number from 0 to 20 as the last number.
9. Using the change index turn the dial left and pass the first number 3 times and stop exactly on the forth time.
10. Turn the dial right and pass the second number 2 times, then stop exactly on the third time.
11. Turn the dial left and pass the third number once, then stop exactly on the second time.
12. Leave the dial on the last number and turn the change key back to the left and remove the change key.
13. With the door open dial the new combo several times on the opening index to ensure the door will open properly.
14. Note: When dialing the new combo on the opening index, the last (forth) number will be a hard stop.

Changing the Combination on an S&G Dial Combination Lock (6730, 6738, 8550)

1. The existing combo and a change key are required.
2. Open the safe door by dialing the existing combo.
3. Dial the existing combo again on the changing index, stopping at the third number of the combo.
4. Insert the change key. The wing should be entirely inside the lock and come to a positive stop. If the key does not insert the wheels are not properly aligned: repeat Step 3.
5. Turn the change key to the left 1/4 turn.
6. Leave the change key in the lock.
7. Prepare to create a new combo of three numbers.
8. Using the change index turn the dial left and pass the first number 3 times and stop exactly on the forth time.
9. Turn the dial right and pass the second number 2 times, then stop exactly on the third time.
10. Turn the dial left and pass the third number once, then stop exactly on the second time.
11. Leave the dial on the last number and turn the change key back to the right and remove the change key.
12. With the door open dial the new combo several times on the opening index to ensure the door will open properly.
13. Note: When dialing the new combo on the opening index, the last (forth) number will be a hard stop.

Note: The part number for the standard S&G 6730 lock is T-3515. The part number for the standard S&G 8550 lock is T-3600.

S&G 6730 Duress Feature

This lock is actually S&G Model 6738-1, but is best known as 6730 with Duress.

Operation: To open the door and trigger the silent alarm, add 10 to the first number of the combo. For example, if the real combo is 50-25-50, using the combo 60-25-50 will trigger the silent duress alarm. Entry to the safe is otherwise normal.

Setup: The switch is located on the side of the lock body nearest the container. To wire the alarm for a normal closed alarm loop connect wires in series to terminals C and NO. To wire the alarm for a normal open alarm loop connect wires in series to terminals C and NC. For low voltage applications use the normal open connectiion.