The FP-66 packs high-volume “Perfect In One Pass” grinding technology into a mid-sized platform.

The Rotochopper FP-66 offers many of the same advantages as the B-66 (our largest grinder) with lower horsepower. So you get the time-saving features designed for large-scale wood waste recycling along with lower fuel costs for smaller raw material volumes.

  • Domed slat infeed conveyor
  • Gap-less infeed transition
  • Patented slab ramp adjustable shear plane
  • Patented concentric powerfeed lift with dual hydraulic drives
  • Patented replaceable mount rotor
  • Biomass rotor package for producing short fiber fuels from round wood (optional)
  • Hydraulic screen installation system
  • Crawler tracks with highway transport dolly (optional)
  • Asphalt shingle grinding package (optional)
  • Simultaneous grind & color system (optional)
  • Auxiliary hydraulic pump for changing screens with the engine disabled

The FP-66 is uniquely scaled to match the needs of forestry biomass processors, large pallet shops, and other companies that need a full-featured grinder with mid-range horsepower.



  • Length: 41′
  • Height: 13′ 3″
  • Width: 9′ 6″
  • Weight: 57,000 lbs

Power Supply

  • 540 – 630 HP diesel engine

Additional Specifications

Feed System

  • 66″ W x 26″ H infeed clearance
  • 66″ W x 16′ L arched slat steel belt infeed conveyor
  • 32″ diameter x 66″ W power feed roller
  • Parallel unequal-length linkage arm powerfeed lift system
  • Hydraulic powerfeed down pressure
  • Engine load regulated feed rates

Conveyor Discharge

  • 48″ W x 26′ L folding truck loading conveyor


  • 5th wheel hitch
  • Two 25,000 lbs axles
  • Hydraulic jacks

Grinding Chamber

  • 36″ diameter x 66″ W rotor
  • 5.4375″ diameter rotor shaft
  • Patented replaceable rotor mounts with indexable teeth
  • Shear pin protected screen installation system
  • Grinding chamber direct injection water manifold


  • Crawler tracks with or without transport dolly
  • Magnetic head pulley
  • Cross-belt conveyor
  • Dust hood
  • Air compressor
  • Cold start kit with integrated timer
  • Reversing radiator fan