| 摘要 |
PROBLEM TO BE SOLVED: To facilitate proper replacing time of a hydraulic fluid by arranging a measuring means, a diagnostic means and a display means in a hydraulic machine. SOLUTION: The light is irradiated to a hydraulic fluid so that transmissivity of the irradiated light is measured by a pollution measuring device 13. This measured value is inputted to a control part 12. Next, a degree of pollution and the degradation of the hydraulic fluid is diagnosed on the basis of the measured value by this control part 12 so that a control command is outputted to a flow control valve 11 and a minitor 14. Then, when diagnosing that the pollution and the degradation do not make progress so much, the control command is outputted to the control valve 11 so as to minimize a flow rate of a bypass oil passage B. Then, oil delivered from a first pump 1 is filtered by a filter 7 to return to an oil tank 3. While, when diagnosing that the degradation makes progress, the control part 12 commands the control valve 11 to increase a flow rate of the oil passage B. Then, the oil is filtered by a filter 8 besides filtration of the filer 7. When diagnosing the replacement of the hydraulic fluid, it is displayed on the minitor 14 to thereby avoid the performance deterioration of a hydraulic apparatus.
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