(1) the car is unstable in a straight line, and the direction of the car can be controlled by turning the steering wheel with a larger angle.

When the vehicle speed of 40km/h, shake the steering wheel, front wheel swing, which is difficult to control the steering wheel.

2. cause of failure

(1) there is a loose phenomenon in the improper installation of the steering gear of the Baotou North running heavy truck.

Second, the meshing clearance of the steering gear is too large, and the gap between the upper and lower bearings of the steering worm is too large or the wear loose and loose, which leads to the increase of the clearance of the steering wheel.

3. The vertical and horizontal tie rod pins are loose and loose, and the fastening nuts are loose.

(4) Baotou North running heavy card accessories turn to rocker arm spline with loosening or fastening nuts.

The wear of the main pin and bushing of the steering knuckle is serious, and the matching clearance is increased.

The front wheel hub bearing axial clearance is too large.

7 Baotou beiben heavy truck parts steering knuckle arm fastening nut loose: front spring U bolt loosening.

The front axle bending: the front wheel is too large.

3. analysis and diagnosis

(1) one person grabs the steering arm and the other person turns the steering wheel. If the volume of free rotation is large, it should be adjusted for the large gap of the spare parts of the steering gear, and check whether the steering gear is installed at the same time.

2. If the steering wheel's free rotation is normal, it can relax the steering arm, turn the steering wheel again, observe whether the connection point of each transmission mechanism is loose or not, and adjust it if necessary.

If the above inspections are all normal, check the front wheel hub bearing, the main pin and the bushing and the steering knuckle arm loosely. If the abnormal wear of the front wheel is found, check whether the front wheel's front axle is correct and whether the front axle is deformed.