The Mighty Giant Model 4012 Power Unit is designed for heavy duty commercial use. The tub tilts hydraulically (something we’ve been doing for over 50 years) for easy access to the hammers and screens. Model 4012 machines are equipped with a swinging elevator system and a multi-function remote control system as standard equipment. Screens are available in a wide range of sizes, with custom configurations available because we fabricate our own screens. The Model 4012 is equipped with a Caterpillar engine. These engines are covered with Caterpillar’s 5 year /5000-hour Extended Service Coverage. The 14” discharge auger under the mill allows trouble-free grinding with less mess under the machine.


  • Engine: Choice of Caterpillar C15 or Caterpillar C18
  • Grinder suspension: Air ride suspension 50,000 lb capacity
  • Clutch: Fluid Coupling
  • Size of mill cylinder: Choice of 26” x 48” or 28” x 50” or 28” x 56”
  • Mill shaft diameter: 5 ½”
  • Mill bearing size: 3 15/16” pillow block bearings
  • Number of hammers: 84 (28 x 50) or 96 (28 x 56)
  • Hammer Size: ½” thick
  • Hammer Swing: 360 Degrees
  • Number of mill pins: 6
  • Mill pin size: 1 ¼” diameter
  • Mill disk thickness: 3/8”
  • Mill base: Constructed of rectangular tube with 3/8” plate auger trough sides and formed 10 ga. auger trough
  • Tub floor and walls: 12 ga.
  • Tub drive: Hydraulic motor with Heavy Duty Chain
  • Number of tub rollers: 8
  • Elevator size: 24” wide x 27’ long
  • Elevator drive: Hydraulic motor with chain drive to rubber lagged pulley on top end of elevator
  • Discharge auger: 14” diameter
  • Screen size: For dry material, round holes sizes up to 11” diameter, For wetter material, half screens various sizes
  • Overall height: approximately 12’-0”


  • Tub opens hydraulically for servicing and changing the screens.
  • Tub hydraulic system uses a variable displacement hydrastat pump with electronic speed control for forward and reverse. Tub is chain driven.
  • Trouble free high capacity 14” discharge auger
  • Uses a rigid elevator that drives from the top with a rubber lagged pulley and hydraulically swings around to the side of the grinder for transportation.
  • Elevators hydraulically raise and lower, and hydraulically swing side to side to make a wider pile or to fill trucks.
  • Hammers have hard surfacing on all 4 edges so that they can be turned 4 times to use all 4 corners.
  • Standard Model 4012’s have a semi-hitch with air brakes and tandem axles with dual 255/75R22.5 tires and wheels.
  • All engines have a heavy duty air filter system with a precleaner and a muffler on the exhaust system. All engines have a completely enclosed engine compartment.
  • Jones Mfg. Co. purchases Caterpillar Extended Service Coverage(Warranty) for 5 Years or 5000 hours on new Caterpillar engines.
  • Handheld remote control allows the operator to control tub and elevator functions from the loader tractor.

Available Options:

  • Reversing engine fan assembly: Enables operator to clean the radiator without turning the machine off.
  • Other engine options available, but must meet specification requirements for machine and approved by Jones Manufacturing Co.