Abnormality diagnosis device for planetary gear reducer and construction machine

The abnormality diagnosis device for the planetary gear reducer has a second vibration sensor attached to the housing of a hydraulic motor, the output shaft of which is connected to the planetary gear reducer, and a controller calculates the peak frequency (Fm) of the hydraulic motor and the rotational speed of the hydraulic motor on the basis of second vibration data obtained via the second vibration sensor. On the basis of the calculated rotational speed and the number and number of teeth of a plurality of gears included in the planetary gear reducer, the characteristic frequency (fd) of each of the plurality of gears is calculated. The presence or absence of an abnormality in a plurality of gears is determined on the basis of a peak frequency (Fm) of a hydraulic motor and an amplitude (fd) at a characteristic frequency (fd) of first vibration data obtained via a first vibration sensor attached to a planetary gear reducer. 行星齿轮减速机的异常诊断装置具有安装于液压马达的外壳的第2振动传感器，该液压马达的输出轴与行星齿轮减速机连结，控制器基于经由第2振动传感器获得的第2振动数据来运算液压马达