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XL-4200-II Reflects Next-Generation Technology

By Walt Moore, Senior Editor | September 28, 2010

Gradall
According to Gradall, the new XL-4200-II features a low profile, short tail swing and good visibility all around.

A Field Test report in the August 2003 issue of Construction Equipment compared Gradall's new truck-mounted excavator, the XL-4100-Series II, to its predecessor model, the XL-4100. We found the new model 13 and 7 percent more productive at trenching and truck loading, respectively, and 15 percent stronger in bucket breakout and boom lift. Impressive numbers. But what really got our attention was the design overhaul that the new machine reflected—new boom, new boom cradle, streamlined hydraulics and comfortable new cabs. Now, Gradall has packaged all this performance and design refinement into a crawler version, the XL-4200-Series II.

According to Gradall, the new XL-4200-II crawler, which weighs in at 44,300 pounds with 31.5-inch shoes, is mounted on a big undercarriage with tracks that are 7 percent longer than those of its predecessor, the XL-4200. A dual-range, high-torque piston motor powers each track, and the drive system, which provides travel speeds to 3.4 mph, automatically downshifts when difficult conditions are encountered. Drawbar pull, says Gradall, is up by 6 percent.

With the installation of a six-cylinder, 6.8-liter, turbocharged John Deere diesel engine, the new model has nearly 11 percent more horsepower. This boost in power, coupled with refinement of the XL-4200-II's hydraulic system, results in a stated increase in breakout force of nearly 35 percent. The new model's hydraulic system uses a single, load-sensing, axial-piston pump that produces 84 gpm. Electronic monitors keep watch on hydraulic-fluid level, temperature and filter restriction.

Of course, the new model retains its predecessor's tilting telescopic boom—a hallmark design feature of Gradall's excavators. The boom and boom cradle, however, have been completely redesigned. The new boom is more robust to accommodate higher digging and lifting forces, and it incorporates simplified hydraulic plumbing for the telescopic section. The cradle, which supports the boom and allows it to rotate 220 degrees, has been redesigned and relocated (from the end of the boom to its midpoint), and it uses a planetary-type drive system that requires no support rollers, as did its predecessor.

A new cab, mounted on the boom's left side, has more elbowroom and uses a standard suspension seat. The cab is fitted with new instrumentation and controls, and the control pattern can be easily switched. For the operator's convenience, the cab is wired for plug-in installation of a radio, CD player and additional lights.

The XL-4200-II, with standard equipment, has an estimated list price of $193,000. 

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