Hitachi Zaxis 17U-5A Operator's Manual page 266

Unlocking
1. Turn key switch (1) ON. Then, all numeric keys (2) are lit.
2. Input the 1st digit of the four-digit password.
3. Similarly, input the 2nd digit.
4. Similarly, input the 3rd digit.
5. Similarly, input the 4th digit.
6. If the input numerals coincide with those of the
password, the buzzer sounds twice, and unlocking is
done. In this condition, when key switch (1) is turned ON,
the engine will start.
f
NOTE: If mis-input the password, the entered numbers can
be cancelled by pushing Key C (3). Alternatively, redo from the
beginning by turning key switch (1) OFF.
OPTIONAL ATTACHMENT
NUMERIC KEYPAD LOCK
13-16
1
M1M7-01-007
2
M1M7-OP1-01-002
1
M1M7-OP1-01-003