How should the elevator maintenance

① the control box button, switch is functioning correctly.
② car door safety device reliability.
③ car roof box push button switch and the car top safety switch function properly.
Part II sedan-the lubricating oil level is normal.
⑤ ceiling fixed traction wire ropes steel wire rope for velocity limiter is no exception.
⑥ speed, reliable layer each part is working properly.
⑦ guide shoe is operating normally.
⑧ car, car roof clean.