When the car is turning around, the steering wheel feels heavy and heavy, and the driver's energy consumption increases.

2. cause of failure

1) causes caused by the steering gear

(1) the adjustment of the upper and lower bearings on the steering gear is too tight or the bearing is damaged, and the working face of the bearing is not fit properly.

The meshing gap between the worm and the roller drive pair is too small.

The steering rocker shaft with the bushing is too small, the assembly is too tight, or the axis of the two bushing is skewed.

(4) the bending of the steering shaft or the shriveled axis of the shaft and rubbing each other.

The steering gear oil or no oil, steering position adjustment tight joint.

2) the cause caused by the steering gear

1. Tighten or lack oil in the head pin of the vertical and horizontal rod.

The steering knuckle bearing is lack of oil or rust.

3. The main pin and bushing of the steering knuckle are tight or lack of oil.

(4) steering knuckle arm deformation, transverse rod bending, steering shaft and casing bending, tube column concave or stuck.

3) causes caused by the driving system

(1) the deformation of the front axle or frame.

(2) the misalignment of the anterior wheel and the misalignment of the anterior bundle.

The pressure of the front wheel is insufficient.

(4) the deflection and size of the steel plate spring of the Mercedes Benz parts in the north of Baotou are not in accordance with the regulations.

4) the cause caused by the power steering

(1) the hydraulic system is short of oil, and the force is not enough when the steering is turned.

The oil pump, the power cylinder or the control valve are worn, the seal ring is damaged, the internal leakage is serious and the pressure is insufficient.

(3) there is air in the hydraulic system.

Drive the oil pump device to work badly (the belt is loose or the gear is undesirable).

(5) the northern Baotou Mercedes Benz accessories filter, oil supply pipeline joint oil leakage or blockage, oil supply is poor.

The safety valve leakage or lack of pressure spring is too soft.

3. analysis and diagnosis

(1) to put the transmission into a low speed, make a left and right turn, turn the head, reverse the car and other tests, determine the weight of one side, or the right and left weight.

2. When the front axle is lifted, the two front wheel is off the ground, and the steering wheel is rotated to carry out the test. If it feels heavy, it indicates that the trouble is not related to the steering and the transmission mechanism. After removing the steering arm and turning the steering wheel, it is still heavy, indicating that the fault is in the steering gear. If it feels light, it will indicate that the fault is in the steering gear. If you use your hand to pull the front wheel, if you feel too tight or unable to pull it, check whether the ball head pin fit is too tight, whether the thrust bearing is normal, whether the main pin is properly fitted with the bushing and whether the lubrication is good, so we need to make necessary adjustment and lubrication to replace the damaged parts.

To lift the front bridge and turn the steering wheel, if you feel turned light, the fault is in the driving system. At this time, it should be carefully checked whether the front wheel pressure is too low, whether the frame and the front axle are deformed, and whether the front plate spring is good. When necessary, the front axle shall be dismantled and the inclination angle of the main pin and the angle of the front wheel shall be checked.

(4) the inspection sequence of steering gear usually checks whether the surface of each journal is intact (geometry is correct), then checks the wear condition of the gear pair engaging surfaces, then checks whether the worm shaft and worm riveting is loose, and the perpendicularity of the hub body and the steering arm shaft. The adjustment of the axial clearance of the upper and lower bearings of the worm and the adjustment of the meshing clearance between the roller and the worm should be examined during the assembly process.

Check whether the pressure of the power steering oil pump of the Mercedes Benz parts in the north of Baotou is normal.