1. Each interface on the device should be checked to see if there is loosening phenomenon;

2. Some small gadgets on the equipment must see whether the wear is more serious, small parts are actually the most easy to ignore;

3. Pay attention to the temperature of the bearing, when unstable, be sure to check and solve the cause of instability;

4. Check the sound of the gear;

5. You can't ignore every little thing, because every great thing happens because you ignore the little things.