m5x130 swing motor

How to diagnose whether the m5x130 swing motor is abnormal? To judge whether the m5x130 swing motor is abnormal, it can be judged by disassembling the slewing motor separately. Turn off the engine first, remove only the fixing bolts of the m5x130 swing motor, separate the main shaft i of the rotary motor from the planetary gear of the rotary reducer for a certain distance, restart the engine, and operate the motor to make a rotary motion to perform evaporative idling. Since the slewing motor has been separated from the slewing reducer, if the slewing motor runs smoothly without any abnormal noise, it means that the slewing motor is faultless.