Komatsu PC138US-11 Operation & Maintenance Manual page 169

OPERATION
When opening
1.
Stop the machine on a level ground, lower the work equipment to the ground, then stop the engine.
2.
Set the lock lever securely in LOCK position (L).
3.
Check that the wiper blade is stowed in the right stay.
4.
Hold two handles (A) on the right and left top sides of the
front window, and pull two levers (B) to release the locks at
the top of the front window. The top of the front window will
come out.
WENAM00111
EXPLANATION OF COMPONENTS
3-99