| 摘要 |
PROBLEM TO BE SOLVED: To lighten a burden of work for checking whether any one of components of construction machinery has to receive maintenance or not, and enable a sure grasp on timing of the maintenance. SOLUTION: When any one of the components needing the regular maintenance has to receive the maintenance, a maintenance mark 30 is displayed on a display screen 2 of a display device 1. When a switch 12 is pushed for operation during display of the maintenance mark 30 on the display screen 2, a component mark 42 corresponding to the component, which has to receive the maintenance, is displayed in a display color different from the display colors of other component marks 41 and 43-50.
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