The performance of steering swing is: when the car is driving, it feels that the two front wheels swing left and right, and the steering wheel is difficult to grasp. The reason is: the adjustment of the ball joint of the horizontal and straight tie rod is too loose (the spring is broken or the adjustment clearance is too large); Excessive free stroke of steering wheel; Excessive meshing clearance between steering gear roller and worm; The clearance between the upper and lower bearings of the worm is too large; The clearance between steering knuckle kingpin and bushing is too large; The assembly of the front wheel housing bearing is too loose, or the out of roundness and runout of the front wheel rim is too large; Front wheel alignment misalignment.