Abstract: To provide an operation vehicle monitoring device that can reduce man hours for maintenance and realize the maintenance efficiency, it includes an input unit (201) in which a signal for instructing registration of a selected monitoring item is input, a display unit (202) that sequentially updates and displays the current detection content of a monitoring item selected from a plurality of monitoring items related to the operation state of the construction machine, a memory (206) that registers the monitoring item for which the signal for instructing the registration is input by the input unit (201), and a controller (203) that causes the display unit (202) to display the current detection content of the registered monitoring item when there is the monitoring item registered in the memory (206).

Abstract: To provide an operation vehicle monitoring device that can reduce man hours for maintenance and realize the maintenance efficiency, it includes an input unit (201) in which a signal for instructing registration of a selected monitoring item is input, a display unit (202) that sequentially updates and displays the current detection content of a monitoring item selected from a plurality of monitoring items related to the operation state of the construction machine, a memory (206) that registers the monitoring item for which the signal for instructing the registration is input by the input unit (201), and a controller (203) that causes the display unit (202) to display the current detection content of the registered monitoring item when there is the monitoring item registered in the memory (206).

Abstract: A liquid crystal display which is installed in a work vehicle provided by the present invention includes a luminance adjusting section which can manually adjust luminance of a backlight in a liquid crystal panel, setting means which sets a luminance adjustable range by means of the luminance adjusting section, and measuring means which measures total operating time of the work vehicle, wherein the setting means has a first storage section which stores a predetermined luminance adjusting range for each operating time of the backlight therein, uses the total operating time measured by the measuring means as the substantial operating time, reads the luminance adjusting range corresponding to the operating time from the first storage section, and sets the read adjusting range as the luminance adjustable range in the luminance adjusting section so that an operator can arbitrarily adjust the luminance of the backlight.