1. Walking (left and right)
2. Jaws (strong enough to hang from)
3. Winch (direct drive, very fast!)
The LDD file linked as instructions uses grey pieces instead of black for better visibility.
The one linked under 3D File Available has accurate colours.
The LDD file has a few parts that could not be placed correctly: The 3L axle with stop sticking in the jaw goes into a 16 tooth gear and a universal joint. The back shell has complex curves and is completely in pieces. The legs are not linked to the mechanisms either.
Waiting for Inventory to load
Use LEGO Digital Designer to open these files and generate step by step building instructions.
This MOC also has a 3D digital file available (eg LDD, MPD, etc): 3D Model