Master Lock 643D Operating Instructions

This lock is preset to open at 0-0-0-0.
To set your own combination:
1. Set dials so 0-0-0-0 aligns with the stripe; lift shackle.
2. Turn shackle 90° (1/4 turn).
3. Press shackle down.
4. To set your new combination, align numbers with the stripe.
5. Lift shackle, return to closed position, and hold shackle down while scrambling numbers to lock.
6. To re-open lock, set dials to your new combination and lift shackle.
Master Lock 643D Set Your Own Combination Padlock
Operating Instructions