Giant Manitowoc crane tested

Overload test of 5.5 million pounds goes “very smoothly.”

Manitowoc Cranes has completed the overload test of its Manitowoc 31000. The 31000, which has a rated capacity of 2,535 tons, lifted 5.5 million lbs.

All new crane designs must undergo an overload test to confirm crane capacity.

“The lift went very smoothly,” says Larry Weyers, senior vice president of the Americas region, “and our unique Variable Position Counterweight worked perfectly.” The counterweight minimizes the crane’s footprint and ground preparation.

The Manitowoc 31000 was fitted with more than 600 strain gauges that measure the tension or compression of the steel components of the crane while lifting.

Kevin Blaney, manager of product marketing for crawler cranes, says that data from the test will be analyzed to determine if any design changes are required in the production units of the Manitowoc 31000. “We’ll check the stresses in the structure to verify the preliminary capacities. Then we will correct them up or down or modify structural components to assure that actual stresses are within accepted limits.”

The largest capacity crawler ever built by Manitowoc, the 31000 is powered by two 600 hp Cummins engines.