The robot crab is full of cold water, which you can use to cool down the Hot Hatch at the Hub on Steamworks Island. However, you will need Sprocket the Robot to help you.
Find the robot at the Living Quarters to the far left of the main part of the island. Jump on him to get him and Sully's door key. Using the Steam Generator (trash bin at the Cantina), open Sully's door and find Sprocket. Ringing the bell on the counter will awaken him. Take him and the crab to the Hot Hatch at the Hub. Use the robot crab and Sprocket will drop it on the Hatch, cooling it down so you can go underground. That is the only use for the crab
the crab on steamworks island is next to the living quarters
The flying robot drops the robot crab on it
Steamworks Island.
use the crab.
Jump on it.
You drop the crab (full of water) onto it. The crab should be found scuttling round, outside the Living Quarters.You give the robot crab to sprocket.
You jump on the top of it, and you will get the crab and Sully's key.
get the crab from the living quarters
You throw it on the hot thing and it cools off.
on the hot hatch on the hub place all the way on the right
he wants to help you break the crab over the hot valve.
The robot crab is full of cold water, which you can use to cool down the Hot Hatch at the Hub on Steamworks Island. However, you will need Sprocket the Robot to help you. Find the robot at the Living Quarters to the far left of the main part of the island. Jump on him to get him and Sully's door key. Using the Steam Generator (trash bin at the Cantina), open Sully's door and find Sprocket. Ringing the bell on the counter will awaken him. Take him and the crab to the Hot Hatch at the Hub. Use the robot crab and Sprocket will drop it on the Hatch, cooling it down so you can go underground. That is the only use for the crab.