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)
its in the museum on mainstreet of steamworks island :)
There are no ghost on steam work island
It's Steamworks Island #14th Island
(The solution is at the related question "How do you beat Steamworks Island")
to work the weed wrecker where it and press space
the crab on steamworks island is next to the living quarters
You go to Steamworks and head to the museum and there is the Deogen
You just get the codes (on the other cheats) and enter them in.
steamworks island
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)
Steamworks island
you can get it on the far left of steamworks island, past the living headquarters.