Testing continues on the new Manitowoc 31000 crawler. The machine walks with a 748,000 pound load.

Testing continues on the new Manitowoc 31000 crawler. The machine walks with a 748,000 pound load.

Testing continues on Crane Rental Corp.'s new Manitowoc 31000. A Crane Rental team travelled up to Manitowoc recently to "visit" the 2,535-ton crane and watch its performance, according to the company.

The crane was configured with 295 feet of No. 90 main boom and the Series 3 counterweight package (1,426,700 pounds), seven parts of line, and heavylift hook and block (118,360 pounds).

In cold, wet and windy conditions, the crane did an excellent job, according Alan Ashlock, president of Crane Rental Corp. "Everything was rock solid on less-than perfect ground conditions," Ashlock said.

"The crane was exceptionally smooth and stable in every radius and configuration, whether walking or stationary."

The crane's Variable Position Counterweight (VPC) system and pick and carry capabilities were demonstrated over two days. The 31000 walked approximately 300 feet with 748,000 pounds of test weight, and made a right turn.

All functions were demonstrated at a 175-foot radius.

On the next day, the 31000 made the same maneuver with a 240,000-pound load (block and 121,640 pounds of test weight) with the counterweights retracted to its minimal 28 foot 6-inch tail swing.

Again, the crane's mobility was excellent, Ashlock said.

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