What should be paid attention to in the steps of repairing the rear axle tooth package of tricycle

During differential maintenance, check whether the bearing is in good condition and the clearance is too large, and resolutely replace it. Pay attention to the fit clearance between large and small splayed gears and planetary gears. If it is broken, the gear will bite or the noise will become louder. When the corresponding screws are fastened in place, it must be confirmed that they cannot be loosened. Replace the seal, and seal it properly during installation to prevent oil leakage from the shell. It's useless to read it, and it's not easy to do. This job seems simple, but it is not. Some tricycles make noises when they are driving.