Re: Crane Underside Detail


You realize the chain has to twist as the truck swivels. The chains that form the speed reduction, that run on sprockets on fixed shafts, are roller chain, similar to bicycle chain. But the last chain in the drive, which runs at the slowest speed, is round link chain which is better at dealing with the misalignment.

Typically, this last drive chain was taken down if the crane was to be handled in a train. The speed restrictions were due more to the poor riding characteristics of cranes in general; they tend to bounce, even if the boom is supported by a cradle on the idler car.

Dennis Storzek

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