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
LEGO Technic Crawler Crane BUILD YOUR HOOK INSTRUCTIONS. Build a Crawler Crane MOC Pt.1 - YouTube
LEGO MOC Crawler Crane (42069 c-model, 42042 alternate) by klimax | Rebrickable - Build with LEGO
Liebherr Crawler Crane LR 13000 42146 | Technic™ | Buy online at the Official LEGO® Shop US
LEGO TECHNIC: Crawler Crane (8288) for sale online | eBay | Lego technic, Rare lego, Crawler crane
USED LEGO TECHNIC SET 42042 CRAWLER CRANE COMPLETE W/ BOX & INSTRUCTIONS | eBay