Komatsu PC78US-6 Operation & Maintenance Manual page 114

MACHINE OPERATIONS AND CONTROLS MACHINE OPERATIONS AND CONTROLS
NOTICE
Do not add oil above the H line. This will damage the hydraulic circuit or
cause the oil to spurt out.
If oil has been added above the H level, stop the upper structure so that the
drain plug (P) under the hydraulic tank will be between both tracks, and
stop the engine and wait for the hydraulic oil to cool down, then drain the
excess oil from drain plug (P).
REMARK
NOTICE
Be sure to pressurize the hydraulic tank. If it is not pressurized, the pump
will suck in air, and this will adversely affect the equipment.
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OPERATION OPERATION