1. Whether the machine equipment is clean and whether the backup bolts and nuts are loose.
2. Whether the lubricating oil is enough and smooth.
3. Whether the belt is normal, it must be adjusted if it is loose, and it must be replaced if it is damaged.
4. Whether the electrical appliance is turned on and whether it is normal, and whether the motor is abnormal.
5. Rotate the flywheel approximately two times with or inching to see if it rotates.