Komatsu PC118MR-8 Operation And Maintenance Manual page 106

INSTRUMENTS AND CONTROLS
(11) Hydraulic fluid temperature gauge
This gauge (11) indicates the hydraulic oil temperature.
During normal operation, the needle should remain within the
green area.
If the gauge needle enters the red zone (A), the hydraulic oil
temperature has reached or exceeded 102°C. Keep the engine
running at idle or switch off the engine and wait for the
hydraulic oil temperature to drop.
q (A) - (B): Red zone
q (A) - (D): Green zone
q (D) - (C): White zone
REMARK
When the gauge needle reaches the red zone (A), the hydraulic oil temperature is as follows.
Red zone (A): > 102°C - Red zone position (B): > 105°C 
When the gauge needle is in the red zone (A) - (B), the hydraulic fluid temperature warning light (E) indicates the
fault.
If the gauge needle is in position (C) upon engine start and the hydraulic fluid temperature is 20°C, the hydraulic
fluid warning light (E) indicates a low temperature status. If this occurs, carry out the warming-up procedure. For
more details, see "Warming the hydraulic system (3-139)".
q Warning light low temperature state (G): Background of
indicator (K) is white
q Warning light correct temperature state (H): Background of
indicator (K) is blue
q Warning light fault state (J): Background of indicator (K) is
red
(12) Fuel gauge
This gauge (12) displays the quantity of fuel in the tank.
During normal operation, the needle should remain within the
green area.
If the gauge needle enters the red zone (A), there are less than
52 litres of fuel remaining and the machine must be refuelled.
q (A) - (B): Red zone
q (A) - (C): Green zone
REMARK
When the gauge needle reaches the red zone (B), there are less than 33 litres of fuel remaining.
The fuel warning light (D) illuminates when the needle reaches the red zone (B).
In some cases, the correct fuel level may not be visible for a few seconds after turning the ignition key to ON. This
is normal and is not a fault.
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FUNCTIONING