I am a modern train. There is always an abnormal sound when you open the door in hot weather. What's the problem?

There has been a serious lack of lubrication. If the door hinge or slide rail lacks lubrication, the iron milling will naturally ring. If the door hinge or slide is not rusted and lubricated in time, it will rust and make abnormal noise, which will make the switch not smooth or even stuck.

Our 4S shop uses Hutou brand hotolube door hinge slideway grease, which is colorless, transparent, low temperature resistant, durable and has safety certification. The baby has a 130g toothpaste tube, which is very convenient to use.

Don't use lubricating oil or ordinary butter in these places, it is easy to lose or freeze at low temperature, and it will also volatilize harmful odor.