Morbark Pronar MPB 20.55 Trommel Screen

Perfectly suited to work with a wide variety of materials, including soil, compost, municipal waste, coal, aggregate and biomass, these trommel screens have easy-to-use electronic controls that allow the operator to tailor the operation parameters to the materials to be separated.

Dimensions and ability to attach and tow the machine to different vehicles allow you to navigate on public roads without special permits. The 20.55 Trommel Screen also is available in a tracked unit.

Morbark Pronar Trommel Screens are also available in three other sizes: the 14.44, 18.47 and 20.72. Specs for these sizes are available in the Full-Line Brochure.

Trommel Drum

Quick and Easy Drum Change

Replacement drums are available with round or square holes and variable drum thicknesses, to meet your specific needs.

Pull-out Platform

Pull-out Platform

The engine and hydraulic system are mounted on a pull-out frame, which provides easy access for maintenance.

Magnetic Roller

Magnetic Roller

Magnetic roller for removal of ferrous metals may be mounted on rear and side discharge conveyors.

Hydraulic Tipping Grid

Hydraulic Tipping Grid

Hydraulic tipping grid for removal of large objects prevents damage to the trommel drum.


Length (transport): 39’4″ (12 m)
Length (operating): 49’10” (15.18 m)
Height: 13’1″ (4 m)
Width (transport): 8’4″ (2.54 m)
Width (operating): 21’2″ (6.46 m)

Length (tracked): 38’1 ½” (11.62 m)
Height (tracked): 11’5 ¾” (3.5 m)
Width (tracked): 10’2″ (3.1 m)

Gross weight (approximately): 35,273 lbs. (16,000 kg)
Gross weight, tracked (approximately): 44,945 lbs. (20,840 kg)

Horsepower: 97 HP (72 kW)
Engine: CAT

Trommel length: 18′ (5.5 m)
Trommel diameter: 6’6¾” (2 m)

Rotational speed: up to 19 RPM

Infeed hopper length: 12’9″ (3.9 m)
Infeed hopper width: 7’3″ (2.23 m)
Infeed hopper capacity: 6.52 cubic yards (5 cubic meters)

Infeed hopper width (tracked): 7’3 ¾” (2.23 m)
Infeed hopper capacity (tracked): 7.85 cubic yards (6 cubic meters)
Effective sieve surface (tracked): 35.64 square yards (29.8 square meters)
Maximum tracking speed: 1.25 mph

Equipment Highlights

  • 18′ (5.5m) long, 6’6¾” (2m) diameter drum assembly can be replaced without removing parts of the machine
  • Wide-opening doors provide accessibility for fast switching of screening drums
  • Motor and hydraulic pump unit are on a hinged trolley for quick and easy maintenance access to motor unit, hydraulic system and hopper
  • Low fuel consumption and maintenance costs

16′ x 31″ (4.9 m x 80 cm) exterior side conveyor
16′ x 31″ (4.9 m x 80 cm) exterior rear conveyor
4’3″ (1.3 m) wide interior longitudinal conveyor
31″ (80 cm) wide interior transverse conveyor

Remote control (tracked unit)

19’8¼” x 3’3 3/8″ (6 m x 1 m) exterior side conveyor (tracked unit)
19’8¼” x 3’3 3/8″ (6 m x 1 m)  exterior rear conveyor (tracked unit)
4’3″ (1.3 m) wide interior longitudinal conveyor (tracked unit)
31″ (80 cm) wide interior transverse conveyor (tracked unit)

Specifications may vary with equipment options.