4600XL Wood Hog Horizontal Grinder

With a large hammermill and a 36″ (91.44 cm) tip swing, the Morbark 4600XL Wood Hog horizontal grinder offers unmatched performance in its class. Features include a 60″ x 46″ (152.4 cm x 116.84 cm) infeed opening for processing bulky material, 1050 HP (782 kW) engine, a pegged feed wheel to prevent wrapping, and rugged WHD-120 infeed chain to easily handle tough material.

MICS System 2017

Morbark Integrated Control Systems (MICS)

Automatically adjusts feed rates and monitors pressures and feed wheel position to maximize production and engine efficiency.


Laser-cut upturn rotor, factory-balanced with forged hammers, offers unsurpassed durability and smooth operation.

Feed System

Internal planetary drive with no chains and sprockets means lower maintenance, more torque and better durability.

Externally Adjustable Break-Away Torque Limiter

Flexible, easily adjustable torque limiter helps protect the driveline and hammermill for damage.


Length (transport) wheeled: 42′ (12.8 m)
Length (operating) wheeled: 63′ (19.2 m)
Height wheeled: 13’3″ (4.04 m)
Height (operating) wheeled: 16’9″ (5.1 m)
Width wheeled: 10’11” (3.33 m)

Length (transport) tracked: 45′ (13.72 m)
Length (operating) tracked: 61’10” (18.85 m)
Height tracked: 11’11” (3.63 m)
Height (operating) tracked: 16’4″ (4.98 m)
Width tracked: 11’3″ (3.43 m)

Gross weight wheeled: 75,660 lbs. (34,320 kg)
Axle weight: 51,600 lbs. (23,405 kg)
Tongue weight: 24,060 lbs. (10,915 kg)

Gross weight tracked: 88,640 lbs. (40,206 kg)

Engine: CAT
Horsepower: 1050 HP (783 kW)

Fuel capacity (tank) wheeled: 370 gallons (1,400 litres)
Hydraulic oil capacity wheeled: 187 gallons (708 litres)

Fuel capacity (tank) tracked: 340 gallons (1,287 litres)
Hydraulic oil capacity tracked: 267 gallons (1,010 litres)

Screen Area: 4,414 sq in (28,477 sq cm)

Brakes: air

Towing arrangement:fifth wheel

Dust suppression system

Hydraulically operated debris containment door

Remote control with tethered back-up system

Automatic reversing fan system

Externally adjustable break-away torque limiter

Magnetized end pulley with collecting slide tray for ferrous metal removal

11 HP (8.2 kW) air compressor with lockable enclosure

Infeed System

Infeed opening: 60″ x 46″ (152.4 cm x 116.8 cm)

Variable speed infeed system consists of one 33″ (83.82 cm) diameter top compression feed roll with internal drive and an 15’5″ long x 60 3/8″ (4.7 m x 153 cm) wide live floor equipped with four strands of WDH-120 chain in a staggered configuration with direct drive.

Hammermill and Grates

36″ x 61-3/8″ (91.4 cm x 155.9 cm) hammermill system constructed of heavy-duty 25-½” (64.7 cm) diameter rotor, (17) 1-1/8″ (44 cm) thick two-piece laser-cut rotor plates to ensure precision and enforce steel strength. The plates are keyed on an 8-3/8″ (21.27 cm) diameter shaft with two 5-3/16″ (13.17 cm) bearings and eight 2-¼” (5.7 cm) hammer retaining rods. Hammermill pattern consists of (18) 2″ (5.08 cm) balanced forged steel heavy-duty hammers, (18) 3-1/16″ (7.7 cm) wide double-edged replaceable inserts and 18 rakers.

Discharge System

Discharge system consists of a hydraulically driven, horizontal 48″ wide x 22′ (122 cm x 6.7 m) long aggregate belly belt conveyor discharging onto a 36″ (91.44 cm) wide stacking conveyor with hydraulic fold for transport.


  • Electric power
  • 12- or 16-knife chipper drum assembly
  • Variety of grates sizes available
  • Hydraulic rod puller
Specifications may vary with equipment options.