Hydraulic pump failure diagnosis device, construction machinery equipped with failure diagnosis device, failure diagnosis method and failure diagnosis program

摘要

PROBLEM TO BE SOLVED: To provide a failure diagnosis device capable of failure diagnosis of a hydraulic pump without newly installing a flow meter or a pressure gauge. SOLUTION: A failure diagnosis device 80 controls a swash plate angle for controlling a pump volume of a variable displacement hydraulic pump based on a deviation between a target rotation speed of an engine and an actual rotation speed which is an actual rotation speed of the engine. The storage unit 81 that stores the related data associated with the control signal and the engine load factor, the data density calculation unit 82 that calculates the data density from the related data, and the variable displacement hydraulic pump based on the data density are abnormal. It is provided with an abnormality determination unit 83 for determining whether or not. [Selection diagram] Fig. 1