When the vehicle is running normally, the driver will experience steering wheel jitter, the front wheel is swaying, and the steering wheel is difficult to control when serious. The reasons for the instability of the steering wheel are: wear and looseness of the ball joints of the horizontal and the straight drawbars; serious wear of the kingpins and bushings of the steering knuckle; excessive clearances; loose front wheel bearings, meshing clearance between the worm and the steering gear of the steering gear Excessively large; worms have large gaps between upper and lower bearings. When driving at low speeds, the front wheels do not oscillate noticeably, while the front wheels oscillate at high speeds and the steering wheel flickers. In addition to the above reasons, there may be front rim arches; the tires are equipped with lining or retreaded tires; Not allowed; leaf spring bolt loose; front axle bent and frame deformation.
Judgment method: 1. A person turns the steering wheel, another person observes under the car. If the steering wheel rotates and the steering arm does not rotate, then the fault is in the steering mechanism. Check whether the worm's upper and lower bearing clearances and the worm and roller's meshing clearance are too large. Large; swinging the steering wheel to the left and right, judging whether the meshing clearance between the worm and the wheel is too large by the feeling; pushing and pulling the steering wheel up and down, judging whether the gap between the upper and lower bearing of the steering gear worm is too large, and if it is too large, adjust it. 2. Two persons are still required to cooperate. If the steering arm is rotated in a large amount and the front wheel is not deflected, check whether the ball joints of the steering arm and the horizontal straight pull rod are loose and if necessary, adjust them. Then set up the front axle and push the tire by hand to check if the gap between the kingpin of the steering knuckle and the bush is too large and if the front wheel bearing is loose. 3. Check if the front rim is arched. You can set up the front wheel first, place a stylus next to the rim (without a stylus, you can also use a wire on a brick or wood), then turn the wheel and place the stylus close to the rim to see the degree of arching, usually no more than 3 ~ 5 mm, otherwise it should be corrected.
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