The Commander 4000 Series of digger derrick from Terex Utilities are designed for long-term reliability.

With four models in the series, they have sheave heights of 42.5, 45.5, 47.4, and 50.4 feet. Work zone capacities at median digging radii range from 5,778 lbs to 4,232 lbs.

“[Commander 4000 digger derricks] can dig holes and set poles without requiring the operator to reposition the truck,” said Joe Caywood, Director of Marketing.

Crews can also load pole trailers without having to unhook the trailer and move it. Meanwhile, optional X-Boost increases lifting capacity when crews need to lift at high boom angles above 50 degrees.

Strength and Rigidity

Dual hydraulic lift cylinders with a trapezoidal design stabilize the boom during digging and rotation, which provides superior out-of-the-hole lifting.

A large nut retention system for the main hinge pin locks the boom and side plates together, which additionally contributes to excellent rigidity. The pedestal has a large diameter rotation bearing and rigid upper and lower mounting plates.

“Terex was the first in the industry to introduce a mechanical digger derrick back in 1945. The Commander Series was first introduced in 1966 and since then has evolved into our current offerings of the Commander 4000, 5000, and 6000 series,” Caywood added.

A wide variety of augers, designed for various types of soil conditions, further contribute to increased productivity on the job site. In addition, augers with interchangeable heads are now available.

 “We recommend the Bullet Tooth Augers for rock applications and the TX Series Augers for dirt or cobble conditions,” said Greg Adler, Regional Account Manager for Auger Tooling.