Gyratory crusher, and failure prediction diagnostic device and method therefor

This gyratory crusher comprises a mantle fixed to a main shaft, a concave forming a crushing chamber between the mantle and the concave, an eccentric sleeve supporting a lower portion of the main shaft via a lower bearing, a drive motor rotationally driving the eccentric sleeve, and a power transmission mechanism that includes a bevel pinion and a bevel gear and that transmits output of the drive motor to the eccentric sleeve, wherein: an engagement vibration acceleration generated by engagement between the bevel pinion and the bevel gear is acquired; an engagement vibration acceleration waveform is obtained by arranging, in a time series, the engagement vibration accelerations detected in a no-crushing-load-period in which an object to be crushed is not supplied to the crushing chamber; and the existence of a sign of a failure is diagnosed on the basis of an analysis result of the engagement vibration acceleration waveform.