Siku 1798 Liebherr R9800 Mining ExcavatorThe giant among crawler excavators on construction sites and in open pit mines is a true colossus, even in 1: 87 scale. The Liebherr R9800 series is among the largest and most powerful excavators in the world. Two wide crawler tracks move this heavy model with its robust metal components. The enormous backhoe arm with its clamshell bucket is fully functional and loads the mining dump trucks in record time.