Impex MARCY MWM-1840 Owner's Manual page 26

Set up the Lock Combination
A.) The combination is pre-set to 0-0-0 by the factory.
B.) Turn the dials to 0-0-0 and aligned to the Combination Set Up Line.
0.
C.) Pull out the shackle and turn 180
D.) Press down on the shackle.
E.) Turn the dials (aligned to the Combination Set Up Line) to your desired combination.
F.) Pull out the shackle and twist back to normal position and the combination are set.
G.) Repeat Procedure C to F to re-set the combination.
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