Why doesn't the motor move when I assemble it?
Please confirm the battery level, whether the battery is installed correctly, and whether the shrapnel is installed backwards. If the shrapnel is not in good contact with the battery, it will not be able to start without power.
Why does the gearbox make abnormal noises and does not run smoothly?
Please check whether the order of the gear combinations in the gearbox is wrong or reversed according to the instructions.
Toys not running smoothly?
Usually the operation is not smooth because the burrs are not trimmed cleanly. Check whether the burrs of the parts are completely cut according to the instructions.
Parts are missing or the part board is broken or broken during disassembly and assembly
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