Komatsu PC78US-6 Operation & Maintenance Manual page 77

OPERATION
WINDSHIELD
When opening or closing the front window, bottom window, or door,
always set the safety lock lever to the LOCK position.
If the control levers are not locked and they are touched by accident,
this may lead to a serious accident.
When opening or closing the window at the front of the cab, stop the
machine on horizontal ground, lower the work equipment completely to
the ground, stop the engine, then carry out the operation.
When opening the front window, hold the grip securely with both hands,
pull up, and do not let go until the automatic lock catch is locked.
When closing the front window, hold the handle with your both hands
and close it firmly.
DETAILED CONTROLS AND GAUGES
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