The Standard for Mid-Sized Grinder Uptime & Efficiency

Like the larger B-66 E electric grinder, the EC series can deliver engineered fiber commodities from a wide range of raw materials, thanks to exclusive Rotochopper features:

  • Steel slat infeed conveyor
  • Gap-less infeed transition
  • Patented slab ramp adjustable shear plane
  • Aggressive powerfeed roller with serrated traction plates
  • Choice of rotor and tooth styles to match raw materials and end product needs
  • Hydraulic screen installation system with shear pin protection
  • Full-length collection conveyor
  • Choice of discharge conveyor styles to meet product handling needs
  • Asphalt shingle grinding package (optional, EC-366 only)
  • Simultaneous grind & color system (optional)

As the third generation of the long popular EC series grinder, the EC-366 continues to raise the standard for efficiency and uptime we set with the first Rotochopper electric grinder. Upgrades to the EC platform include a full-length roller bed collection conveyor, roller bed discharge conveyor, wear liners, and independent colorizer controls (optional). These upgrades result in even cleaner operation, simpler maintenance, and lower operating costs than before. The advantages of these upgrades become particularly evident in facilities that grind steady streams of tear-off shingles, green waste, and other sticky, abrasive materials.



  • Length: 30′ 9″
  • Height: 9′
  • Width: 8′ 6″
  • Weight: approx. 28,000 lbs.

Power Supply

  • 150-400 HP Electric
  • Dedicated hydraulic pump motor
  • Solid state soft start

Additional Specifications

Feed System

  • 66″ W x 18″ H infeed clearance
  • 66″ W x 16′ L heavy duty steel belt infeed conveyor
  • 32″ diameter x 66″ W power feed roller
  • Motor load regulated feed rates

Grinding Chamber

  • 26″ diameter x 66″ W rotor
  • 4.25″ diameter rotor shaft
  • Choice of tooth mount styles and placement patterns
  • Shear pin protected screen installation system
  • Grinding chamber direct injection water manifold


  • N/A

Conveyor Discharge

  • Choice of conveyor styles. Please call for details.


  • PAS grind and color system
  • Bale pre-processing system
  • Magnetic head pulley
  • Cross-belt conveyor
  • Dust hood
  • StopWatch Monitor & Control System
  • Lift Kit
  • 24 volt remote control

* All weights are approximate and vary with configurations and options

** Dimensions for electric models do not include discharge conveyors, which vary in length & height.