Komatsu PC78US-6 Operation & Maintenance Manual page 130

MACHINE OPERATIONS AND CONTROLS
Warming-Up Operation
NOTICE
When the hydraulic oil is at a low temperature, do not carry out operations or move the lever suddenly. Always carry out the
warming-up operation. This will help to extend the machine life.
Do not suddenly accelerate the engine before the warming-up operation is completed.
Do not run the engine at low idling or high idling continuously for more than 20 minutes. (Oil down) If it is necessary to run
the engine at idling, apply a load from time to time or run the engine at a mid-range speed.
NOTICE
When the work equipment is retracted, take care that it does not interfere
with the machine body or ground.
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OPERATION