1. Common causes of heavy steering: (1) The upper and lower bearings of the steering gear are over-tightened or the shaft is damaged; the worm and the roller (tooth fan) are engaged too tightly. (2) The knuckle kingpin and the knuckle thrust bearing have poor lubrication or rust; the knuckle kingpin and the bushing are too tight; or the bushing is rotating to block the oil passage and the grease cannot enter, so that the sleeve and the joint pin are sintered. (3) The steering shaft, the casing is bent or the stem is recessed, causing friction or seizing. (4) The ball pin parts of the vertical and horizontal tie rods are tightened too tightly or lacking in oil. (5) Improper toe adjustment or low front wheel pressure; front axle or frame bending deformation. 2. Steady diagnosis and elimination of steering: Judgment and elimination of heavy steering should be performed in the order of first steering gear, then linkage mechanism, and other parts. The specific methods are as follows: (1) Remove the steering arm and turn the steering wheel. If you feel heavy, the worm bearing tightness or the meshing clearance of the worm and roller (or tooth fan) is improper. If you turn the steering wheel and you feel uneven or stuck, the worm wheel or bearing may be damaged. Check the steering gear. If the steering wheel has a scratching sound, the steering shaft is generally bent or the casing is recessed and should be corrected or replaced. (2) Remove the steering arm. If the steering wheel rotates flexibly and effortlessly, the fault should be on the linkage mechanism. The front axle shall be lifted, the left and right front wheels shall be pulled, the kingpin of the steering knuckle shall be inspected, the bushing and the thrust bearing, and the horizontal and the straight rods shall be checked. Whether the ball pin joint is too tight, whether the lubrication is good, and whether the bushing is sintered, and if necessary, it should be adjusted and replaced. (3) If the above inspection results are all good, check whether the front axle and frame are deformed, whether the front wheel alignment is inaccurate, and whether the tire pressure is normal. The front axle and frame deformation should be corrected or replaced, and the front wheel misalignment should be adjusted. (4) In steering, if there is accidental or intermittent steering heavy phenomenon, there is no certain regularity; and in the event of heavy, there is no fixed position of the steering wheel angle, this may be due to a long time no change of lubricant in the steering gear, The oil is interspersed with hard particles that wear away from the metal parts and are caught between the worm and the roller (or tooth fan), occasionally causing heavy steering. Cleaning the steering gear and replacing the oil can eliminate the malfunction.
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