B2320DT FRONT AXLE Parts group B2320DT G10100 FRONT AXLE FRAME G10500 FRONT AXLE CASE G11500 FRONT DIFFERENTIAL G12100 BEVEL GEAR LH G12200 BEVEL GEAR RH G12300 BEVEL GEAR CASE G12600 FRONT AXLE CASE LH G12700 FRONT AXLE CASE RH G13000 FRONT AXLE LH G13200 FRONT AXLE RH G13800 DRIVE SHAFT (FRONT) G13900 DRIVE SHAFT (REAR) sale parts diagram catalog online construction equipment excavator tractor