Komatsu D155A-6 Operation & Maintenance Manual page 160

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