Terex Corporation has unveiled the 845G "E-Traction" motor grader, marking the industry's first heavy-class grader to completely abandon the traditional driveline in favor of direct electric wheel-hub motors. In road construction, maintaining precise drawbar pull while fine-tuning the blade angle on steep side-slopes is critical. Traditional mechanical drivelines suffer from drivetrain windup and sudden traction loss when the inner wheels lift off the ground during sharp articulation. The 845G E-Traction eliminates the transmission, driveshaft, and differential entirely.
The engineering breakthrough is the "Independent Wheel-End Torque Vectoring" system. Powered by a 400 kW solid-state battery pack (with a swappable hydrogen fuel-cell range extender), electricity is routed directly to four permanent magnet motors integrated into the tandem drive wheels. When the operator engages the blade to cut a steep cross-fall, the inside wheels naturally lose vertical load. Instead of a mechanical differential sending all power to the slipping wheel, the ECU reads the wheel speed sensors 100 times per second. If the inside wheel speed exceeds the outside wheel speed by 2%, the ECU instantly reduces torque to the inside motor by 50% and redirects that electrical current to the outside motor. This generates a turning moment that pulls the grader smoothly through the curve without engine lug or tire scrubbing. Furthermore, the system features "Dynamic Blade-Load Trimming." When pushing heavy windrows of dirt, the electric motors provide instant maximum torque from 0 RPM. If the blade hits a buried boulder and the grader begins to stall, the system momentarily increases the wheel-end torque by 30% for 2 seconds to power through the obstacle, preventing the operator from having to shift gears or back up. This electric architecture reduces fuel and maintenance costs by 45% while increasing grading precision in variable soil conditions.
