How to judge the failure of the electro-hydraulic thrusters

How to judge the failure of the electric hydraulic thruster?
① The electric hydraulic thruster in the operation of the motor is abnormal noise and oscillation, should be timely check whether the bearing is damaged, such as damage should be replaced in time; Then check whether the rotor is loose, such as loose should be adjusted in time.
② When the thrust of the electric hydraulic thruster decreases, check whether the amount of oil is lack, if lack should be made up in time; The voltage of the grid is not lower than 85% of the additional voltage, if it is low, it should be advanced to the additional value in time.
③ Regularly check whether the electric hydraulic thruster is working normally, whether the oil is enough, whether there is leakage, whether the insulation of the introduction wire is outstanding, and whether the protection equipment is appropriate and reliable.
Check the oil once a half year, when the oil disintegration, viscosity increase should be replaced in time.