Simplex 900 Series Mechanical Pushbutton Lockset

Step 10. Slide the faceplate onto the holding bracket. Make sure the faceplate aligns with the cross bore opening.

Step 11. Insert the lock assembly from the rear of the door into the cross bore openings. Position and rotate the thumbturn to the vertical position to accommodate the shaft of the ball bearing clutch assembly.

Step 12. Install the three mounting screws while keeping the lock assembly in place.

Once the lock has been installed, test the operation with the door open. If there is a problem, the lock can be easily accessed.

Step 1. With the door open, turn the outside thumbturn counterclockwise to the stop position. This clears any numbers that have been entered into the combination chamber.

Step 2. Enter the combination. The factory preset combination is two and four pressed together, then three. Each time a button or buttons are pressed, you should hear distinctive clicks.

Step 3. If the operating combination has been properly entered, turning the outside thumbturn clockwise will retract the deadbolt. Note: If at any time a mistake is made, turn the outside thumbturn counterclockwise to clear the combination chamber.

To extend the deadbolt from the outside, turn the thumbturn counterclockwise until it stops.

Changing The Combination

Most Simplex pushbutton locks have the same factory default combination. It is important to change the factory default combination once the lock has been installed.

The combination can be changed without removing the lock from the door. Choose the new combination carefully before changing. Remember: A combination cannot use any number more than once. When setting up a new combination, two or more numbers can be pressed simultaneously as part of the combination.

When changing the combination of a Simplex 900 lock, have the door open to prevent accidental lockout. This is especially important when changing a deadbolt model combination because turning the deadbolt model's thumbturn to clear the chamber causes the bolt to extend and lock in position.

Step 1. Clear any entry by turning the outside thumbturn to the left (counterclockwise) until it stops. Then release the thumbturn.

Step 2. Remove the hex head screw from end of the lock housing using a 1/8" hex wrench.

Step 3. Enter the operating combination. A slight click should be heard as each button is depressed.

Step 4. Insert the long end of the Allen wrench into the screw hole and gently depress the internal lockout slide until there is a slight click. Do not force. Remove the hex wrench from the lock. Depressing this slide permits the combination to be changed.

Step 5. Clear the combination by turning the outside thumbturn counterclockwise to the stop position. Then release the thumbturn.

Step 6. Enter the new combination by carefully depressing the buttons. A slight click should be felt as each button is depressed.

Step 7. Turn the outside thumbturn clockwise to the stop position to set the new combination. Then release the thumbturn.

Test the new combination at least three times before closing the door. Reinstall the hex head screw.

Clearing a lost combination

The following instructions enable the user to set a new combination when the combination is no longer available. The only way to determine an unknown combination is to remove the combination chamber from the lock, which requires disassembly of the lock.

Step 1. Remove the lock from the inside of the door by removing the three Phillips head screws.

Step 2. Remove the two screws and flange washers from the opposite ends of the center plate containing the barrel assembly from the lock housing.

Step 3. Lift out the center plate.

Step 4. Remove the two screws securing the gear plate.

Step 5. Carefully lift out the gear plate and disconnect the armature from the sector cam.

Step 6. Remove the two screws securing the combination chamber in the housing.

Step 7. Lift the combination chamber out of the housing.

Step 8. Use a small straight slot screwdriver to remove the "e" ring from the unlocking slide stud.