12. OPERATION CHECK CENTRAL WARNING LAMP Carry out the following checks to prevent failure by the warning system due to defective operation of the buzzer or blown lamp bulb in central warning lamp 1 . Stop the engine, turn the starting switch to the ON position, set the parking brake valve lever to the PARKING position, move the shift lever to any position other than N, and check that the lamp flashes. If the air pressure is below the specified pressure, the lamp should flash and the buzzer should sound when the starting switch is turned ON. CHECK MACHINE MONITOR SYSTEM 1. Before starting the engine, turn the starting switch to the ON position. 2.
Check that all monitor lamps, gauges, and the central warning lamp light up for approx. 3 seconds and that the alarm buzzer sounds for approx. 1 second. REMARK When this is done, the speedometer should display 88. When the starting switch is at the ON position, if there is not at the neutral position, the transmission shift lever position pilot lamp and the central warning lamp will flash and the alarm buzzer will continue to sound intermittently. At this time, when the lever is placed at neutral, letter “N” is displayed, the central warning lamp goes out and the buzzer stops. After the engine is stopped, the monitor cannot be checked until at least 30 seconds have passed. 3.
When checking the monitor, check for blown bulbs in the the caution lamps and pilot lamps at the same time. Before starting the engine, turn the starting switch to the ON position, press bulb check switch 1 , and check that no caution lamp or pilot lamp bulb is blown. If the monitor lamp, caution lamp, or pilot lamp do not light up, there is probably a failure or disconnection, so please contact your Komatsu distributor for inspection. 2-56