Komatsu PC1250-11 Original Instructions Manual page 167

OPERATION
(a) Correct stowing position
The wiper blade is on the cab.
(b) Wrong stowing position
The wiper blade is on the glass.
3.
Hold the handles (A) (2 places) on the right and left top
sides of the front window, and pull the levers (B) (2 places)
to release the locks at the top of the front window. The top
of the front window will come out.
EXPLANATION OF COMPONENTS
3-101