When the car is running at a speed of less than 20km/h, the front wheel swings left and right.

The front wheel swing amplitude will be more and more the vehicle with a jitter.

2) cause of failure

The front camber of the front axle is too small, or the front beam is small (front big and small), and the camber of the front wheel becomes smaller.

The front plate spring is loose, the deflection is bad, the load is flattened or bent down, so that the kingpin caster angle changes.

The bolts of the steering gear of Baotou North heavy truck are loose and the transmission gap is too large.

4. Loosening and fixing the knuckle arm.

The connection point of the longitudinal and horizontal tie rod is loose, the spring breaks or the gap appears.

The Baotou beiben heavy truck parts hub bearing clearance is too large.

The rear wheel overload or insufficient tire pressure.

3) analysis and diagnosis

Check the steering system. One turn the steering wheel, another steering mechanism observed in the body, such as the steering wheel excessive free movement of the fault in the steering gear itself; such as the steering arm swing and the front wheel deflection is not many, the fault in the transmission mechanism, should arm and longitudinal and transverse pull rod of each joint is loose to check when necessary, adjust. If the steering gear and steering gear are good, should be from the top of the front axle, on the side of the tire, the tire with a crowbar to pry, check the wheel hub bearing is loose, adjust and repair as necessary.

Measuring the front toe of the front wheel according to the measuring position specified by the manufacturer. The front beam misalignment and the matching of the front wheel camber angle are not reasonable, which can not effectively eliminate the lateral sliding of the front wheel edge caused by the camber angle of the front wheel, resulting in low speed shimmy. The measurement result should be adjusted correctly when the measurement result is not in conformity with the regulation.

Check whether the specifications of the leaf spring before the Baotou heavy truck fittings are wrong, whether the elasticity meets the requirements, and whether the U bolt assembly is loose or not. These factors will cause the inclination angle to be smaller, and even lose the ability of the front wheel to automatically return to the middle position of the straight line and shimmy.

According to the abnormal wear of tires to judge.