Cut through tough ground conditions with the T655III Commander?? 3 tractor with optional trencher, rockwheel or bucket wheel attachment. The optional bucket wheel attachment is designed for the installation of small-diameter cross-country pipelines and helps increase productivity in soft soils, while the optional rockwheel attachment is designed for highway lighting, fiber installation and rock applications. The Tier 3 or Tier 4 Final John Deere 6090 HF diesel engine provides the power to dig up to 8' (2.4 m) deep. Low-speed, high-torque splined headshaft motor improves cutting performance and minimizes chain wear, while the exclusive Vermeer SmartTEC electronic control system monitors real-time machine performance.