518-3389 355-5668 5183389 3555668 336D2 em will send free parts to repair. And this model Final Drive used for excavator hitachi

518-3389 322-8729 355-5668 511-6018 5183389 3228729 3555668 5116018 336F and With 6-12 months warranty，Any quality problem will send free parts to repair. And this model Final Drive used for excavator hitachi

518-3387 518-3388 518-3389 5183387 5183388 5183389 335F 336E and With 6-12 months warranty，Any quality problem will send free parts to repair. And this model Final Drive used for excavator hitachi