538-9739 550-5744 5389739 5505744 320D3 main pump cat 320d and With 6-12 months warranty，Any quality problem will send free parts to repair. And this model Hydraulic Pump used for excavator

173-3381 200-3366 1733381 2003366 320C and With 6-12 months warranty，Any quality problem will send free parts to repair. And this model Hydraulic Pump used for excavator main pump cat 320b, cat 320 main pump