How to adjust the steam door of An Kai school bus 19 seat?

Adjustment of door speed The movement speed of pneumatic door pump is controlled by fine adjustment of two speed regulating joints on the pump body. The door closing speed can be changed by adjusting the opening of the upper speed regulating joint, and the door opening speed can be controlled by adjusting the opening of the lower speed regulating joint.

19 seat school bus, the car is not big. Because the cart has 50 seats. So it is not a cart. /kloc-the school bus with 0/9 seats is a medium-sized school bus. It is a medium-sized school bus. Many schools adopt this medium-sized school bus.