Komatsu PC18MR-3 Operation & Maintenance Manual page 61

OPERATION
DETAILED CONTROLS AND GAUGES
Fuel Gauge
This meter (2) shows the fuel level in the fuel tank.
F indicates that the tank is full.
E indicates that the fuel level is low. If the fuel level goes below 6.0
liters (1.59 US gal), the indicator enters red range (A), and at the
same time, pilot lamp (B) flashes.
If the indicator enters red range (A) or pilot lamp (B) flashes, check
the fuel level and add fuel.
The correct level may not be displayed for a short time after the
starting switch is turned to the ON position, but this is not a
problem.
REMARK
The fuel gauge indicator moves to the right position after it once
swings to either E or F when the starting switch is turned to the ON
position.
Service Meter
This meter (3) shows the total time that the machine has been
operated.
Use this display to manage the specified service intervals.
If the engine is running, the service meter advances even if the
machine is not being operated.
The meter advances 0.1 for every 1/10 hours (6 minutes) of engine
operation, regardless of the engine speed.
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