Many reasons cause this, some may include meshing of the gears might be wrong, broken bearing in motor(yes, that does happen), gear/differential scraping parts of the car.

 
  • 很多可能性:可能是齿隙造得不好(扫齿);轴承坏了;齿轮/差速摩到壳/车身;差速太松;齿差速坏齿;车壳和车身接合太松等...
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