Improperly meshed or worn gear wheels, gear wheel brackets broken or improperly secured.
Improperly meshed or worn gear wheels, gear wheel brackets broken or improperly secured.
齿轮啮合不好或破损，齿轮支架破裂或不牢固。
Improperly meshed or worn gear wheels, gear wheel brackets broken or improperly secured.
齿轮啮合不好或破损，齿轮支架破裂或不牢固。