| 摘要 |
PROBLEM TO BE SOLVED: To enable the exact diagnosis of the abnormality of a working vehicle by measuring peak hydraulic pressure greatly related to the fatigue of hydraulic equipment such as a hydraulic pump, and by measuring the fatigue of the hydraulic equipment such as the hydraulic pump with excellent accuracy. SOLUTION: The peak hydraulic pressure PK in which hydraulic pressure produced for a determined time (for five seconds) in hydraulic equipment 18, 19 becomes not less than determined levels P0 , P1 is measured. The abnormality occurring at the working vehicle 1 is diagnosed, based on the data of occurring times n of the peak hydraulic pressure PK. This enables to measure the fatigue of the equipment with excellent accuracy and accurately diagnose the abnormality of the working vehicle.
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