on the top right when you enter the island
you break it with your rubber mallet.
if you go to the right you will see a place to put the dirty beaker
it's across the drawbridge
The "crane" is a drawbridge that lowers to the right to reach the Botanical Research Lab. You will need the key to lower the bridge. (see related question)
They are both left of Main Street on the main scene of the island. Here is a general layout : Storeroom-Living Quarters / Garage-Sully's / Cantina-Museum / Hub / Botanical Research Lab
its in the museum on mainstreet of steamworks island :)
The monsters on Steamworks are all mutations of plants on the island. They took over the island after being altered in the Research labs (Production Zone) to the right of the Hub. You battle them at several locations on the island. (see related question)
It's Steamworks Island #14th Island
(The solution is at the related question "How do you beat Steamworks Island")
3 blue, 2 green, 4 red. Theres a poster in the lab that says it
the crab on steamworks island is next to the living quarters
When you are getting the Living Quarters key from the closet in the Greenhouse of the research lab (production zone), you set off an alarm. Since you cannot leave the way you came, use the rubber mallet to break the glass dome near the upper left corner of the lab.