B2320HSD FRONT AXLE Parts group B2320HSD G10101 FRONT AXLE FRAME G10501 FRONT AXLE CASE G11500 FRONT DIFFERENTIAL G12000 DIFFERENTIAL GEAR SHAFT G12300 BEVEL GEAR CASE G12500 FRONT AXLE CASE G13000 FRONT AXLE G13500 FRONT DRIVE SHAFT sale parts diagram catalog online construction equipment excavator tractor