Komatsu PC308USLC-3E0 Operation & Maintenance Manual page 100

DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES
4. Hold 2 grips (A) on the left and right top sides of the front
window, and pull the 2 levers (B) to release the locks at the top
of the front window. The top of the front window will come out.
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OPERATION OPERATION