1. The belt does not pull, the wheel rotates, and the machine does not move.
Treatment method: Remove the tensioner, check the teeth of the tensioner, and clean up the dust if there is any dust. If the tightening gear is damaged, replace the tightening gear.
2. The belt does not pull, the wheel rotates, and the machine moves forward.
Treatment: Remove the lower gear plate, check the lower gear plate, if there is dust, clean up the dust. If the lower tooth plate is damaged, replace the lower tooth plate. If the elasticity of the No. 83 spring is not good, the No. 83 spring needs to be replaced (it is recommended to replace the No. 83 spring frequently). If the rotation resistance of No. 50 is large, remove it and clean the dust (be careful not to get oil, which is easy to stick to dust).