4750B Electric Grinder

Electric power for permanent or semi-permanent operations.

4750B Electric Grinder


The Peterson 4750B Horizontal Grinder is the electric powered version of the popular 4700B. Highly productive and efficient, it hits the “sweet spot” in the Peterson grinder product line. Powered by twin 400 HP (300 kW) electric motors with either soft-start or Variable Frequency Drive (VFD) control packages, the 4750B is ideal for stationary or semi-stationary operations. Electric power costs are typically much lower than diesel fuel costs, and in today’s changing economy, electric power may be the answer to increasing your profits.

With an internal drive compression roll and a 60 x 37½ inch (152 x 95 cm) feed opening, the 4750B Horizontal Grinder can handle the requirements of your daily grind.

The 4750B Horizontal Grinder features Peterson’s Adaptive Control System, which controls all components of the feed system to optimize output. This system senses variations in motor load and adapts the operating parameters to produce the maximum amount of material at all times.

Peterson’s three-stage grinding process with an up turning rotor and large grate area enables the 4750B to produce materials to exact specifications. The quick-change multiple grate system makes it easy to customize grate configurations to produce a wide variety of finished materials. Grates are removed through an access door on the side wall.

Since 1981, Peterson has specialized in the developing of delivery and processing equipment that turns low-grade organic materials into high value products.

4750B Electric Grinder


The Siemens PLC Control System

Easily monitor system performance. The fully integrated, industrial grade Siemens PLC interface is user-friendly and customizable to your application.

The Impact Release System Protects Your Investment

Peterson’s patented Impact Release System’s latching detent  (cover removed) provides uniform grinding and protection from contaminated feedstock, a feature unique to Peterson grinders.

Maximum Power With High Torque Electric Motors

The 4750B’s industrial grade electric motors have a rugged cast-iron frame and a dynamically balanced die-cast aluminum rotor for durability and long wear.

Heavy-Duty Feed Chains

Features heavy duty feed chains to ensure a lasting product.

Use Peterson Bits for The Best Quality Product

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

Use Peterson Grates for The Best Quality Product

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

The 4750B standard drum rotor.

The 4750B comes standard with a robust drum rotor.

The 4750B optional pinned rotor.

The 4750B can also come equipped with an optional pinned rotor for tougher or contaminated materials.

4750B Electric Grinder


General Dimensions

Operating Length
56'-4" (172 m)
Operating Height
16'-6 1/2" (504 cm)
Operating Width
9'-8 1/2" (296 cm)
Travel Length
39'-8 3/4" (1211 cm)
Travel Height
12'-3 1/2" (375 cm)
Travel Width
8'-6" (259 cm)
Hopper Length
16'-11" (516 cm)
Hopper Width
60" (152 cm)
Hopper Height
7'-9" (236 cm)
Front to 5th Wheel
4'-2 1/2" (128 cm)
5th Wheel to Center Axle
27'-9 3/4" (848 cm)
Axle Spacing
4'-6 1/2" (138 cm)
5th Wheel Clearance Radius
6" (183 cm)
5th Wheel Height
49'-3/4" (1684 cm)
Ground Clearance
10" (25 cm)


Machine Weight*
64,000 lbs (29 029 kg)
Tri-Axle Weight*
44,000 lbs (19 958 kg)
*depending on configuration


Electric Power
USA-460 volt, 60Hz, 3-phase electric
Europe-400 volt, 50Hz, 3-phase electric
Canada-575 volt, 60Hz, 3-phase electric
Rotor Drive Motors
crusher duty, 2 x 400 hp (300 kW)
Auxillary Motor (for hydraulic functions)
high efficiency 100 hp (75 kW)
Main Hydraulic Tank Capacity
105 gal (397 L)

Feed System

9 yd³ (6.88 m³)
4 sections, full hopper width
Feed Opening (width x height)
60" x 37 1/2" (152 x 95 cm)
Compression Roll Diameter (tip to tip)
33 1/2" (85 cm)


Rotor Shaft Size
4 7/16" (113 mm) @ bearing, 5 3/4" (146 mm) @ center
1050 rpm @ 2100 rpm (engine)
Rotor Width
63 1/2" (161 cm)
Rotor Diameter
38" (96.5 cm)
Bit Size (width x height)
2 3/4 x 5" (7 x 12.7 cm)
Number of Bits


Number of Grate Sections
Total Grate Area
4023 in² (25 955 cm²)
Grate Coverage
187 degrees
Grate Thickness
1" (2.54 cm) or 1 1/4" (3.12 cm)

Discharge System

54" (137 cm)
Discharge Conveyor Speed
450 ft/min (137.2 m/min)

Optional Equipment

Centralized Greasing

Production (with two 400 hp motors)

360 yds³/95 US tons (275 m³/86 metric tons) per hour
425 yds³/65 US tons (325 m³/59 metric tons) per hour
Actual output may vary due to moisture content, material density, material size, support equipment, and grate size. Production rates are based on grinding 50 minutes per hour.

Specifications subject to change without notice

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