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Very impressive. I'd like to know how long it takes to set a crane like that up, and how long to set up for 1 lift?
TK, it looks like the come-a-longs are used for exactly what you mentioned. Or maybe a precaution to keep the load from shifting? They are both on the outside legs.
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Don't quote me on this, as I'm by no means an expert, but probably a day or two, no more to set the crane up. Usually, the crane can self assemble it's own counter weights, and such, but more than likely, a separate crane is used to assemble to luffing jib, as it is assembled in parts and the big cranes boom must be fully boomed down, since assembly of the jib is done on the ground.