Komatsu PC138USLC Operation & Maintenance Manual page 78

OPERATION
ECO Gauge
This gauge (14) shows the working load status.
When the gauge is in green range A, the work load is light to
medium. When the gauge is in orange range B), the load is heavy.
When the gauge enters the orange range, there is no
abnormality on the machine, but to protect the environment,
reduce the engine output to a point where there is no adverse
effect on the operation. Generally, carry out energy-saving
operations in the green range. Reducing the frequency of travel
also helps to save energy. Consider the best way of saving
energy.
DETAILED CONTROLS AND GAUGES
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