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Made for the Composting Industry of Today and Tomorrow

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1670 Roto-Mix Industrial Compost Mixer

The Dependable Mixer

Progressive compost technicians know once a proper recipe has been selected, mixing the ingredients is essential to ensure rapid decomposition and quality compost. One of the major benefits of mixing is to uniformly distribute nutrients and microorganisms throughout the compost pile.

The ROTO–MIX design combines gentle tumbling with quick complete mixing to save time and improve your bottom line. The ROTO–MIX conveyor can be used to build windrows or static piles. ROTO–MIX has a complete line of Industrial Mixers—one that will meet your needs today and tomorrow.

GeneRation II Staggered Rotor Mixers

Illustration GenRation 2 Staggered Roter

patent pending

Available as Truck, Trailer or Stationary Models

The ROTO–MIX mixing system carries US Patent Nos. 4,506,990—4,597,672—4,741,625 and CANADA Patent No. 1,249,262—other foreign patents pending.

1670 Stationary Industrial Compost Mixer
Industrial Compost Trailer MixerIllustration 5 Blade Rotor

The rotor design lifts ingredients up to the side augers that move ingredients end-to-end for a fast thorough mix. Unlike the wedge point on other brands, our rotor lifts the material past the wedging point of the lower side auger, giving you a fluffier mixture while lowering power requirements.

Drawing Rotor ActionTotal movement of material in the mixing chamber eliminates dead spots common in conventional auger mixers.

Compost Spreading Attachment

For fast, accurate compost application–great for highway projects, housing developments, erosion control or anywhere an even compost bed is required.

Compost Spreading AttachmentCompost Spreading Attachment

patent pending

Features and Benefits

Easy Access Rear Doors

The single lever latch makes inspection easy and desirable compared to other little latches or hardware.

Single Point Grease Bank

Allows quick lubrication from a single point. Heavy-duty drive assembly runs in an enclosed oil bath.

Lower Center of Gravity

A lower center of gravity makes for a more stable unit when making windrows and less shock load when cornering.

Forward Pitched Rotor

The patented rotor lifts ingredients up to the side augers that move the ingredients from end-to-end for thorough mixing. The lifting action of the rotor eliminates wedging of the compost under the lower auger. Patented tumbling design reduces mixing power requirements.

Industrial Duty Drive Train

Spline shafts eliminate shearing of keys and gaulding of shafts. Heavy-duty chains and bearings extend life and reduce downtime.

Industrial Flighting

3⁄4", 5⁄8" and 1⁄2" flighting available for lower auger to extend life. Top augers available in 3⁄8" and 1⁄2" flighting.

Flared Side

The flared side allows ingredients to tumble out of the rotor speeding up the mixing action and reducing the chance for ingredients to get trapped inside the rotor.

Full Scale Frame

Sturdy box frame construction with rectangular tubing for increased stability and weighing accuracy. Scale frame assembly allows scale frame to float independent of truck frame.

Particle Integrity

The ROTO–MIX system protects particle size with less grinding or compaction. Particle size and porosity are critical because it determines how well air can enter and diffuse into the composting mass.


With better air introduction and distribution, ROTO–MIX consistently produces quality compost by lifting the ingredients past the lower auger’s wedge point, resulting in a fluffier mixture that starts to compost faster.

Totally Mixed Compost

Our thorough mixing action eliminates dead spots, auger tunneling and corner pile-up giving a consistent balance of nutrients and microorganisms from the first yard of compost to the last.


Mixes all types of compost ingredients, solid waste, yard waste, food waste, sludge and amendments, animal manure and a number of others with consistency day after day.

Industrial Scale Check System

Load-cell mounting comes standard with ROTO–MIX ball and socket type tie bars to connect the mixer to the frame. This feature eliminates side and end movement on the load cells, which allow for scale dependability and accuracy.


Optional hydraulic folding conveyor up to 120" long gives you ability to build windrows, static piles or load truck fast and efficiently. We also have a portable stand-alone conveyor for stationary models.


The forward pitch rotor design, adjustable UHMW wiper blades, and the rotation of the lower auger quickly and efficiently cleans out the mixing chamber.

Rugged Dependability

Short wheel base allows for easy maneuverability and tight turning radius.

Heavy Duty Drive Assembly

The extra heavy-duty drive assembly runs in an oil bath.

A grease bank allows easy access to all drive assembly bearings.

Lower auger and rotor have double tapered roller bearings and both augers are flanged for easy removal over the top.

A low center of gravity puts less shock load on the axle and springs when cornering or driving over rough terrain.

Rotor is equipped with spring tension bars to relieve pressure and eliminate wedging of bulky materials. UHMW wiper blades are adjustable for a fast, effective clean-out.

Extra heavy wall auger tubes give maximum life and less maintenance.

Patented tumbling action allows easier pulling mixer action, reducing the load on the transmission, PTO, and drive line.

ROTO–MIX units have two automotive type drive shafts from a truck PTO to one heavy-duty gear reducer

The rotor design keeps the lower side auger at full capacity, giving quick clean-out.

only 2 augers photo

Only two augers with one-half to two-thirds less flighting than most conventional auger mixers.

The patented rotor lifts material up to the side augers that move the material from end-to-end for thorough mixing. The lifting action of the rotor eliminates wedging of bulky materials under the lower auger.

Innovative Indicators by Digi-Star

RD Wireless Photo

RD Wireless, 1000 Remote with RF 900 Transceiver

Load precise rations without straining to see the display.

A transceiver (RF 900) connected to an EZ Indicator in the cab communicates via radio frequency to another RF 900 on the loader, which is connected to a Wireless RD 1000 Remote Display. With 16 different channels to select from, this is an ideal application for multi-unit installation since you no longer need a remote on each truck.

Digistar Transmitter Receiver

Transmitter / Receiver (TR optional)—Radio controlled TR lets you zero and select net or gross from up to 100 ft. away.

Put Ingredients’ Weight at Your Fingertips

Get more for your money with the EZ II line of indicators. Call ROTO–MIX for information on the complete line and related products including stainless steel load sensors.

Quality—It’s Built In

2570 Stationary Industrial Compost Mixer

Stationary Units

  • Right or left hand discharge available.
  • Higher side discharge location allows easier loading of conveyors while maintaining a minimum mixer height.
  • Low electric horsepower requirements.
  • Flexible motor mount designs to keep overall space requirements to a minimum.
  • Wide base scale frame.


  • Door—wide door openings allow for fast ingredients’ delivery with easy hydraulic control while mixer is running.
  • Conveyor—stationary incline belt conveyor with 10 hp electric motor.
  • Ladders to aid in inspection of mixing chamber.
  • Stainless steel body or liners for mixing chamber.
  • Rotor options of 5 and 6 bar to match your ingredients’ density and improve mixing speed and performance.
Trailer Frame Illustration

Trailer Features

  • Single pole tongue allows for a tight turning radius.
  • Trailer constructed of heavy-duty tubular steel with built in scale mountings.
  • Heavy-duty hubs and spindles designed for years of trouble free operation.
  • A wide selection of tire choices.
  • Rear bumper is standard equipment.
  • Short wheel base allows for tight turns and easy maneuverability.
  • Adjustable hitch clevis allows the operator to level mixer with most tractors to maximize mixer efficiency.
  • Heavy-duty, tubular trailer frame ensures long life and maximum scale accuracy.
  • Weigh bar scale or load-cell mounting.
  • Load-cell mounting comes standard with Roto-Mix ball and socket type tie bars to connect the mixer to the frame. This feature eliminates side and end movement on the load cells which allows for scale dependability and accuracy.
  • Heavy-duty leaf spring suspension on 2670 and 3410 units.
1670 Stationary compost Mixer With Conveyor

Energy Efficiency at its Peak

In design, operation and maintenance, the ROTO–MIX mixer
was developed with pure cost-efficiency in mind.

You’ll find fewer bearings and less moving parts overall than conventional auger mixers.
It all adds up to fewer repairs and a reduced cost for maintenance.

1670 Compost Mixer
Variable rate discharge door.

The ROTO–MIX variable rate discharge door is hydraulically operated and can be opened or closed with the mixer running to control compost flow. This feature eliminates constant PTO off-and-on, reducing torque surge and offering operation ease.

Optional Hydraulic folding conveyor.

Optional hydraulic folding conveyor up to 120" long gives you ability to build windrows, static piles or load truck fast and efficiently.

ROTO–MIX Industrial Compost Mixer Specifications

Model Description 1670 2300 2670 3410
Maximum Mixing Capacity (cu. yd.) *** 16.7 23 27.8 34.1
Maximum Mixing Load (lb) *** 17,500 17,500 20,500 26,100
Unit Weight (lb) Truck Installed 13,650 16,380 19,975 21,685
Unit Weight (lb) Trailer w/Tires 15,400 18,130 22,125 25,085
Unit Weight (lb) Stationary w/o Motor 13,360 16,090 18,655 20,485
Power Requirement (hp) Truck 230 230 230 250
Power Requirement (hp) Trailer 110 120 130 140
Power Requirement (hp) Stationary 50 50 50 40 / 75
Mixer Length (in) 170 218 223 232
Mixing Chamber Length (in) 144 192 192 216
Length Hitch to Tire Center (in) 171 182 185 1⁄2 193
Length Cab to Axle Center (in) 108 138 144 156
Overall Length–Trailer (in) 226 278 278 303
Overall Length–Truck (cab to bumper) (in) 181 229 235 262
Overall Length–Stationary (in) 182 1⁄2 230 1⁄2 234 250
Overall Width–Folded Spout (in) 112 112 115 122 3⁄4
Overall Width–Stationary (in) 106 1⁄2 106 1⁄2 110 118 3⁄4
Overall Width–Mixer Only (in) 106 1⁄2 106 1⁄2 110 118 3⁄4
Overall Width–Optional Conveyor (in) 140 140 145 172
Overall Height–Trailer* (in) 110 1⁄2 110 1⁄2 121 130
Overall Height Mixer / Truck Frame / Ht. (in) 116 / 36 116 / 36 119 / 36 135 / 36
Overall Height Mixer–Stationary (in) 85 1⁄2 85 1⁄2 89 1⁄2 101 3⁄4
Overall Width of Tires–Trailer (in) 94 94 96 96
Overall Width of Tires–Truck (in) 96 96 96 96
Discharge Hinge Height Trailer (in) 45 45 51 59
Discharge Hinge Height Truck (in) 51 51 52 56
Discharge Width (in) 46 1⁄2 46 1⁄2 46 1⁄2 46 1⁄2
Thickness–Bottoms (in) ** 3⁄8 3⁄8 3⁄8 3⁄8
Thickness–End Plates (in) 1⁄4 1⁄4 1⁄4 1⁄4
Thickness–Sides 7 ga 7 ga 7 ga 7 ga
Top Auger Flight (in) 3⁄8 x 24 OD 3⁄8 x 24 OD 3⁄8 x 24 OD 3⁄8 x 24 OD
Lower Auger Flight (in) 3⁄4, 1⁄2 x 24 OD 3⁄4, 1⁄2 x 24 OD 3⁄4, 1⁄2 x 24 OD 3⁄4, 1⁄2 x 24 OD
Rotor Diameter (in) 72 1⁄2 72 1⁄2 76 1⁄2 84 1⁄2
Rotor Bar Options 5,6 5,6 5,6 5,6
Drive Chain–Auger Drive ** #80H-100-120 #80H-100-120 #80H-100-120 Hydrostatic
Drive Chain–Rotor Drive #140 #140 #120-(2) #180

*Tire size may vary in height. Unit weight, listed most common option packages. All dimensions and specifications are subject to change without notice.

**Other options available.

***Maximum mixer capacity can be reached by volume or weight. By volume, each rotor bar should always be visible at the peak of the rotor cycle. By weight, when maximum load capacity is reached.

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