BUILT) Lego 8288 Crawler Crane, Hobbies & Toys, Toys & Games on Carousell
Mini crawler crane designed I came up with (cat for scale) I used set 42121 as the base and the instructions for set 8288. The hardest part was setting up the pulley
Liebherr 1750 LR Crawler Crane - Building LEGO - BRICKPICKER