27S Electric Drop Feed Hog

27S Electric Drop Feed Hog


The Peterson 27S Electric Drop Feed Hog is a wood waste processing machine, designed for applications that need a small footprint, excellent productivity, and easy maintenance.

Based on Peterson’s proven 2700-series rotor and grate design, the 27S Electric Drop Feed Hog is a simple and robust design that is ideal for sizing odd shaped materials.

The 27S Drop Feed Hog uses a 150 to 400 hp (112–300 kW) electrical motor that can be powered by a VFD or soft start controls. The 27S is a drop feed design, where material is gravity fed into the hopper, and is reduced against an anvil and sized through four grates which can be easily changed to match your product specification.

The 27S is available with either a pinned or drum rotor. The mill assembly is protected with a variety of shear pins, designed to break away under a heavy impact of trapped material, protecting your investment. The sides of the grinding chamber are made from thick, abrasion resistant steel, to protect the rotor, and facilitate a long wear life.

The 27S Electric Drop Feed Hog is easily serviced by large access doors on the front and rear the machine, allowing easy bit and grate service, minimizing maintenance and machine inspection time.

27S Electric Drop Feed Hog


Maximum Power with High Torque Electric Motor

The 27S uses a crusher duty electric motor that has a rugged cast-iron frame and features a dynamically balanced die-cast aluminum rotor for durability and long wear. 

Two Rotor Styles Available

A 20-bit or 30-bit drum rotor, or 18-bit pinned rotor are available, with a wide variety of bit styles available depending on your application.

2-Stage Grinding Process

Feed material is gravity fed and fractured against a heavy-duty anvil (1) and sized through four grates (2), quickly and efficiently reducing material size.

Peterson Bit & Grates Provide the Best Quality Product

Peterson offers a wide variety of durable, long-lasting bits and grates to enable you to produce exactly the products your customers demand.

27S Electric Drop Feed Hog



Overall Length
13' 2" (400 cm)
Overall Width
6' 7" (201 cm)
Overall Height
6' 9" (204 cm)
Grinder Length
6' 8" (203 cm)
Grinder Width
6' 1" (184 cm)
Grinder Height
5' 8" (173 cm)
2' 4" (70 cm)
Direct Drive Motor Centerline
2' 7" (79 cm)
In-feed Length Clearance
1' 8" (51 cm)
In-feed Width Clearance
2' (61 cm)
In-feed Length
5' 1 " (154 cm)
In-feed Width
2' 2" (65 cm)


Machine Weight*
Approx. 18,000 lbs (8165 kg)
*Varies based on optional equipment and machine configuration.


Electric Power
460 volt, 60Hz, 3-phase electric
Rotor Drive Motors
crusher duty, 150–400 hp (112–300 kW)

Feed System

Feed Opening (width x height)
2' 2" x 5' 1 " (65 x 154 cm)


Rotor Shaft Size
5.125" (130 mm) @ bearing, 5¾" (146 mm) @ center
10,362 fpm (3158 mpm) @ 2100 rpm (engine)
Rotor Width
60"(152 cm)
Rotor Diameter
32" (81 cm)
Bit Size (width x height)
2.75 x 5" (70 x 127 mm)
Number of Bits


Number of Grate Sections
Total Grate Area
21 ft² (1.9 m²)
Grate Coverage
Grate Thickness
1" (25 mm)

Optional Equipment

Pinned and Drum rotor options available
Support Structure

Specifications vary based on optional equipment and machine configuration and are subject to change without notice. Measurements are rounded to the nearest whole increment.

Request More Info

  • This field is for validation purposes and should be left unchanged.