Abstract:To improve the problems that the car lift leveling circuit operation is difficult, time-consuming and laborious, it was redesigned. A three-position fourway valve was used to replace two manual fill oil valve of the original system. the trigger signal orderly transfer was realized with the help of the limit switches of the original system, final operation with one key was achieved. The improved leveling circuit can reduce labor intensity and misoperation, improve the service life of equipment.