Possible cause: The front bearing is malfunctioning and causes shaking. The continuous rotation of the bearing will increase the frictional force over time. For example, water rusts, the bearing steel ball is out of round, and the gap is large, which will cause the bearing to be damaged. Once the steel ball "off the track", the front wheel will lose balance and shake badly from side to side. Difficult to control, please replace the bearing in time.
Solution: 1. Spray the rust remover on both ends of the screw to let the rust evaporate and help dismantle. Use a proper Torx wrench to cover the screw. It is best not to use a live-end wrench or a larger wrench to tighten it. It is easy to flatten the screw edge, which brings trouble to disassembly afterwards.
2. Remove the front axle. Sometimes it is very difficult to remove the front axle. Do not forcefully smash it out to prevent damage to the screw pattern. Use the screw cap to flatten the screw shaft and knock it. It may be easy to loosen and tighten back and forth. When removing it, pay attention to the sleeves on both sides of the shaft. Which side of the shaft should be placed on which side. Some front wheels have disc brakes. The misalignment of the sleeves will make the brakes not installed or worn. Kick out the bearing, there is a set of "lap" between the two bearings, it is best to use a suitable steel rod to kick it off! Then clear the sleeve and kick another bearing (some of them have disc brake pads and smash it unsupportably, otherwise the disc brake pads will lose their roundness and the brakes will be biased, so they will be scrapped). . One for a pair.
3. Check whether the ring is damaged by the injured bearing "Wai", whether the outer circle of the bearing is worn (the inner circle does not rotate, the outer circle rotates to prevent abnormal noise during installation), and it should be replaced if it is broken. Yuan customers also want to use it in exchange for a thin iron or aluminum pad. Make the bearing in place to be parallel, knock the bearing into place and slowly knock it into place, and be sure to hit it in place (the bearing sleeves on one side of the bearing top and the other side must be installed, without it being tightly rotated, the bearing will soon fall apart) Pry down the bearing oil seal with a sharp awl and apply lubricating oil to make the lubrication oily and rotate smoothly. The screw of the shaft must be tightened, otherwise it will escape and hurt the owner.