DRILL OPERATOR WAS ATTEMPTING TO REPLACE THE DECK WRENCH CYLINDER CONNECTING PIN AND KEEPER (CAB SIDE) WHICH CONNECTS THE YOLK OF THE CYLINDER TO THE DECK WRENCH FRAME. THE DECK WRENCH CYLINDE R IS HYDRAULIC CONTROLLED. EE ATTEMPTED TO OPERATE THE CYLINDER CONTROL LEVER INSIDE OF CAB DOOR WITH HIS RIGHT HAND WHILE REACHING TO ALIGN THE CYLINDER YOLK WITH THE DECK WRENCH FRAME FOR C