Komatsu PC78US-6 Operation & Maintenance Manual page 76

DETAILED CONTROLS AND GAUGES
SUN ROOF
When leaving the operator's compartment, set the safety lock lever securely to the LOCK position.
If the control levers are not locked, and they are touched by mistake, this may lead to a serious accident.
When opening or closing the roof hatch, carry out the operation on horizontal ground. If you open or close the hatch when the
footing conditions are poor, there is danger that you may fall.
Opening
Closing
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OPERATION