3104554 gear center fits hitachi zx350-3 zx330-3 zx370-3 hpv145 pump gear box. MOTTROL USA EXCAVATOR PARTS DEPOT. YOUR BEST SOURCE FOR OEM QUALITY EXCAVATOR PARTS. For the parts described with both part number and application machine model or engine model, please make sure to order according to the part number, the application machine model or engine model is just for reference.