Bush for bearing 1754546 is generally divided into two kinds of before and after the lifting lug the front lifting lug is used to fix the steel plate and the rear bridge positioning can only rotate can not move often need to fill butter or replace the rubber sleeve. The rear lifting lugs can move backward or extend. Generally the rear lifting lugs of large trucks are fixed but the steel plate extends while the trolley is a movable lug and the steel plate and the lug move at the same time. After the main effect on the load so that the steel plate can be extended extended can have a normal buffer effect.