When the Mounted crane truck products are running and braking, longitudinal or lateral force will be generated, such as the simultaneous braking of the large and small vehicles, a synthetic braking force will be generated, so that the track bears an oblique thrust. If there is a height difference between the two sides when the track is installed, the center of gravity of the Mounted crane truck products will move to the lower side, thereby increasing the lateral force on the track, so that the wheels on one side of the track are tightly clamped on the outside of the track, resulting in track gnawing.

When the diameters of the main and driven wheels on both sides of Mounted crane truck products are not equal (due to uneven manufacturing and wear), when the crane is running, at the same speed, the strokes of the two sides are not equal, and the side with the larger diameter should gradually advance. , so that the car body is skewed and the rail is gnawed. If the wheel is not installed in the correct position, it is also easy to cause rail gnawing.

The deformation of the bridge frame and foundation of Mounted crane truck products will inevitably cause the skew of the wheel and the change of the span size, which will cause the crane to run and gnaw the rail. Due to the deformation of the bridge frame, the end beam will be bent horizontally, causing the horizontal deflection of the wheel to be out of tolerance. It is also the main reason for gnawing.