Master Lock 646D Series Programming Instructions

Written Instructions

Note: This lock is preset at the factory to open at 0-0-0.

1. With dials at 0-0-0, pull out shackle.

2. Turn shackle counterclockwise 90° (1/4 turn) and press it down.

3. Continue FIRMLY PRESSING SHACKLE DOWN and turn another 90° (1/4 turn).

4. Set the dials to your own combination.

5. Turn shackle clockwise back to the original 90° position.

6. Lift shackle and return shackle to closed position