OPERATION EXPLANATION OF COMPONENTS 4. Grip knobs (A) at the top, bottom, left, and right of the front window, and pull lock lever (B) to release the lock at the top of the front window. The top of the front window will come out. 5. Hold lower knob (C) with your left hand from inside the operator's cab, and with your right hand, grip top knob (D), pull it up, and push it against lock catch (E) at the rear of the cab securely to lock the window. 3-27