Komatsu PC138USLC Operation & Maintenance Manual page 76

OPERATION
Hydraulic Oil Temperature Gauge
This meter (11) shows the hydraulic oil temperature.
During normal operations, the indicator should be in the green
range.
If the indicator enters the red range (A) during operations, the
hydraulic oil temperature is 102°C (215.6°F) or more. Run the
engine at low idling or stop it and wait for the hydraulic oil
temperature to go down.
(A) - (B): Red range
(A) - (D): Green range
(D) - (C): White range
REMARK
When the indicator reaches red range (A), the hydraulic oil temperature is as follows.
Red range (A) position: 102°C (215.6°F) or more
Red range (B) position: 105°C (221°F) or more
When the indicator is in red range (A) - (B), hydraulic oil temperature monitor (E) shows the abnormality display.
When the engine is started, if the indicator is at position (C) and the hydraulic oil temperature is 20°C (68°F),
hydraulic oil temperature monitor (E) shows the low-temperature display. If this happens, carry out the warm-up
operation. For details, see "Hydraulic Equipment Warm Up (PAGE 3-141)".
Display (G) at low temperatures: Monitor background (K) is white
Display (H) at correct temperatures: Monitor background (K) is
Display (J) when condition is abnormal: Monitor background (K)
Fuel Gauge
This meter (12) shows the amount of fuel remaining in the fuel tank.
During normal operations, the indicator should be in the green
range.
If the indicator starts to enter red range (A) during operation, there
is less than 52 liters (13.74 US gal) of fuel remaining, so carry out
inspection and add fuel.
(A) - (B): Indicates red range
(A) - (C): Indicates green range
REMARK
When the indicator reaches red range (B), there is less than 33
liters (8.72 US gal) of fuel remaining.
When the indicator is in red range (B), fuel level monitor (D) lights
up red.
The correct fuel level may not be displayed for a short time when the starting switch is turned ON, but this is not an
abnormality.
blue
is red
DETAILED CONTROLS AND GAUGES
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