LEGO TECHNIC: Crawler Crane (8288) for sale online | eBay
LEGO 8288 Crawler Crane Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO 8288 Crawler Crane | Brickset
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