Komatsu ecot3 Operation And Maintenance Manual page 74

OPERATION
Engine Oil Level Monitor
Monitor (2) warns the operator that the oil level in the engine oil pan
has dropped.
If oil level in the engine oil pan is low, the lamp lights up in red, so
check the oil level, and add oil.
Maintenance Interval Monitor
This monitor (3) lights up when the maintenance due time gets
close and remains lighted after the maintenance due time has
already passed.
Lighted yellow: The maintenance due time is due within 30
hours.
Lighted red: The maintenance due time has already passed.
This monitor lights up when the starting switch is turned to ON
position. It goes off after 30 seconds and the display changes to
the normal screen.
REMARK
For details of the method of confirming the maintenance
interval, see "Maintenance Selector Switch (PAGE 3-42)".
If it is desired to change settings for the maintenance interval,
have your Komatsu distributor change the settings.
DETAILED CONTROLS AND GAUGES
3 - 17