Common steering system faults

Deviation of direction

Directional deviation is manifested as: in driving, feel the car automatically to one side, the steering wheel must be firmly held, in order to maintain the right direction of driving. The reason is: about the tire pressure is not equal; Individual brake shoe scraping brake hub, or one side wheel housing bearing is too tight; Individual leaf spring broken, both sides of the steel plate elastic uneven; Front axle or frame bent; Misalignment of front wheel or unequal wheelbase on both sides; The clearance between the knuckle kingpin and the bushing is different, or the tightness adjustment of the ball head on both sides of the transverse tie rod is different; The freight car was unevenly loaded.

Directional swing

Direction swing head performance: the car in the driving, feel the two front wheels swing around, the steering wheel is difficult to master. The reason is: the ball head of the horizontal straight rod is adjusted too loose (spring break or adjustment gap is too large); Steering plate free travel is too large; The engagement clearance between the steering wheel and worm is too large; The clearance of worm upper and lower bearing is too large; The clearance between the knuckle kingpin and the bushing is too large; The front wheel housing bearing assembly is too loose, or the front wheel rim out of circle swing difference is too large; The front wheel is out of alignment.

Steering heavy

Steering heavy performance: let the car turn, turn the steering wheel, feel heavy. The reason is: the upper and lower shaft of the worm is adjusted too tight or the bearing is damaged; Worm gear and worm meshing too tight, steering rocker arm shaft of steering gear and bushing have no clearance; The steering shaft is bent or the pipe string is dented and scraped against each other; Steering wheel touching, grinding pipe string; The thrust bearing on the steering knuckle is short of oil or damaged; Steering knuckle kingpin and bushing assembly too tight or lack of oil; Steering knuckle pull rod (straight pull rod) screw plug is too tight, or pull rod joint lack of oil; The ball head of the transverse pull rod is adjusted too tight, or the pull head is short of oil; Low tire pressure; Front axle or frame bent, front wheel misalignment.

underturn

Understeer in a turn is shown as: the car does not have enough spin when turning. The reasons are: the steering rocker arm installed on the rocker arm shaft position is improper; The steering Angle limit bolt is adjusted too long; The front axle moves forward and backward; Circulating ball or steering gear fan tooth and worm box assembly position is improper.

Front wheel adjustment

The maximum deflection Angle (steering Angle) of the front wheel affects the steering radius (also known as passing radius) of the car when turning. The larger the deflection Angle, the smaller the steering radius, and the stronger the maneuverability of the car.

The maximum deflection Angle of the front wheel is adjusted by the limit screw on the front axle. The method is as follows: push up the front axle and turn the steering wheel to make the front wheel deflect to the collision object (fender plate, crossbar, frame, etc.) 8~10mm away. Turn the limiting screw to limit the wheel to this position. At this time, the included Angle between the center line of the tire landing track and the center line of the tire landing track when the tire is running in a straight line is the maximum deflection Angle. The maximum deflection Angle and minimum steering radius of various models are not the same. Please refer to the car's instruction manual before adjustment.