Komatsu D475A-5E0 Operation & Maintenance Manual page 152

OPERATION
CHECK BACKUP ALARM SOUND
1. Turn starting switch to ON position (B).
2. Set parking brake lever to FREE position (F).
3. While depressing the brake pedal, set joystick (steering,
directional and gear shift lever) to REVERSE position (b).
The buzzer must sound immediately.
Buzzer will continue to sound until the joystick is moved to
NEUTRAL position (N) or FORWARD position (a).
4. As soon as it is confirmed that the buzzer is working properly,
set the joystick to NEUTRAL position (N), put the parking brake
lever to LOCK position (L), and then release the brake pedal.
OPERATION
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