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1. Causes of driving deviation (1) The two driving tire pressures are inconsistent, which makes the center of mass of the vehicle higher than that of the symmetrical position and makes the two-wheel rolling radius different. (2) Deformation of the frame, distortion of the front fork, or deformation of the wheel hub. (3) The elastic force of the spring on both sides of the front fork shock absorber is inconsistent, or the shock absorber on one side of the shock absorber is seriously leaking, and the left and right vibration damping effects are inconsistent. (4) The frame and rear axle are not correct, the front wheels are not on the symmetrical axis of the two rear wheels, or the rear axle is skewed. (5) The steering shaft sleeve is not correct, the lengths of the shock absorbers on both sides of the front wheel are not equal; the parallelism of the central axis of the three holes on the flange is excessive; the steering column nut is tightened too tightly, or the upper and lower thrust bearings are seriously damaged. It is difficult to turn the front wheels. (6) The spring height of the leaf spring lug is relatively high with respect to the plane height of the frame; the spring force of the leaf springs varies. (7) Inadequate manufacture or assembly, the front steering wheel is offset from the symmetrical central axis of the two driving wheels, or the rear axle is not perpendicular to the frame. (8) Improper loading of goods, or brake lag on unilateral wheels. 2. Exclusion of driving deviation (1) Check whether the tire pressure is sufficient. If it is insufficient, inflate it and make the air pressure of the two driving wheels consistent. If the driving wheel of one side is seriously worn out, the cause should be found and excluded. (2) Check the handlebar rotation is flexible, if the rotation is not working even issuing a card, should loosen the nut on the steering column, and check the upper and lower thrust bearings, add grease; when the bearing race or steel ball is damaged, should be replace. (3) Check the shock absorber. If any oil leakage is found, replace the seal ring and add vibration damping oil. If the left and right shock absorber springs are found to be inconsistent, check whether the spring has cracked or broken and replace it. New item. (4) Check whether the fork is distorted. If it has been deformed, it should be corrected on the press. Note: When inspecting and repairing the deformation, check the fork for cracks by oil soaking. If there is any crack, it should be repaired or replaced. (5) Check whether the rim and hub are deformed, the twisted rim should be corrected, and the deformed hub can be processed or replaced. (6) When loading the cargo, it should be centered as far as possible to avoid driving deviation and partial grinding of the driving wheel caused by partial load.