1. The cause of the wheel. First, due to manufacturing errors, the use of uneven wear and tear, maintenance, unilateral replacement, etc., resulting in both sides of the wheel diameter, running at the same speed, both sides of the trip is not equal, the diameter of the side will gradually advance, The formation of non-synchronized, so that the body skewed gnawing track. Second, the installation of the four wheels are not rectangular corners, the same side of the wheel center is not a straight line, the formation of the wheel centerline skew, resulting in gnawing track.

2. The reason for the track. First, due to the rail laying is not standardized, the formation of horizontal bending is too large, straightness error greater than 2mm, resulting in fixed line gnawing track. Second, the track gauge is too large, the outer edge of the gnawing track; the other hand, the inner edge of the gnawing track. Third, the two tracks on the same section of the tread vertical height difference is greater than 15mm, resulting in the side shift caused by gnawing track. Fourth, two orbit parallelism tolerance, the formation of "character" or trumpet-like, causing gnawing track. Fifth, the track is not solid, the load subsidence, causing gnawing track.

3. Cause of deformation of bridge. First, the deformation of the bridge caused by horizontal bending of the end beam, when the diagonal length is greater than 5mm or more, resulting in span tolerance, if it is positive when eating the inner wheel rim; Second, the horizontal bending of the beam to promote the horizontal deflection of the wheel, so that the wheel center line and the track center line is not a straight line, the formation of the same bias caused by gnawing track. Third, the vertical deformation of the bridge, causing the wheel vertical deflection, so that the tread center line and the vertical line angle, change the wheel's rolling radius, load, the side of the vertical deflection of the wheel gradually increased, the other side of the vertical skew Reduce the formation of rolling radius range, resulting in gnawing track.

4. Respectively, driven by the crane truck operating mechanism of the two motor speed is inconsistent, or two brake clearance adjustment is different, resulting in brake torque ranging, the pace is inconsistent, resulting in gnawing track.

5. Transmission mechanism at both ends of the coupling gap is too large, causing the wheel can not drive at the same time, resulting in gnawing track.

6. There are oil on the track tread or debris caused by both sides of the wheel speed, will lead to gnawing track