Protection of construction lifts

We must carry on the maintenance to the construction elevator car door and hall door. Because a lot of fault are in car door and hall door.
We should put oil on the door rack so that it is well lubricated, so that the elevator does not make strange noises when it is in use. And see 
what happens to the elevator's safety touchpad switch. Because this elevator opened and closed many times, it could easily hurt the switch line.