The Master Lock model 175 combination lock is designed to secure gates, fences, and other doors and entrances that may require a high security lock. The Master Lock 175 is unlocked using a personal combination. You can use a special key, included with the purchase of the lock, to change the combination.
Set the wheels on the bottom of the Master Lock 175 combination lock, to the current combination. If no combination has yet been set, rotate each wheel to "0."
Unshackle the lock. Insert the special key into the keyhole in the side of the Master Lock 175 combination lock, and push the key all the way in.
Turn the key 90 degrees in either direction. Leave the key in place.
Set the wheels to the desired combination. If writing down the new combination, place the written combination in a secure place.
Turn the key back to its original position, 90 degrees from its current position. Remove the key.
Shackle the Master Lock 175 combination lock. Scramble the new combination.