To provide an abnormality diagnostic device for a hydraulic elevator, capable of predicting trouble of a hydraulic equipment substantially hindering the operation of an elevator.
A data measuring part 21 for measuring pressure on the discharging side of a motor-driven pump, and a data storing unit 22 for storing a measured value of pressure on the discharging side are provided, pressure on the discharging side is measured by the data measuring part 21 in the heating operation in which operating oil is returned to an oil tank through a relief valve and the temperature of the operating oil is raised, and judgement of abnormalities is performed on the basis of the correlation between the measured value of pressure on the discharging side and the last measured values stored in the data storing part 22. When this time measured value is larger than the last measured value, it is judged that the relief valve is abnormal, while, when this time measured value is smaller than the last measured value in rising of a car, it is judged that a check valve is abnormal. Moreover, when this time measured value is smaller than the last measured value in not-rising of the car, it is judged that oil leakage to the outside is generated.
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YOSHIMIYA YUZURU
TAMURA TAKASHI
AOKI MAKOTO
