Komatsu PC308USLC-3E0 Operation & Maintenance Manual page 65

OPERATION
Emergency Monitors
If the monitor lights up red, stop the engine immediately or run at low idle, check applicable location, then perform necessary
actions.
These items should be observed while the engine is running. If there is a problem, the monitor for the abnormal
location lights up red and buzzer sounds, perform action immediately.
(1) Engine coolant temperature monitor
(2) Hydraulic oil temperature monitor
Engine Coolant Temperature Monitor
Monitor (1) warns operator that the engine coolant temperature
has risen.
If engine coolant temperature becomes abnormally high, monitor
lights up red, overheat prevention system is automatically
actuated, and the engine speed goes down.
Stop operations and run engine at low idle until monitor (1)
changes to green.
CAUTION
(3) Engine oil pressure monitor
DETAILED CONTROLS AND GAUGES
3 - 9