The jaw heights of the four main fixtures are uniformly adjusted.

Lift the vehicle to a certain height by secondary lifting or jack. Loosen the bolt of the jaw, move the four main fixtures to the body fixing point in turn, drop the vehicle, and put the skirt of the fixing point into the jaw. Tighten the jaw bolt to make the trolley and the main fixture become a whole. Fix the main fixture and the platform with the main fixture fixing bolts. Then fix the fixture fixing block to the fixture base.