The RM300 combines superior performance and reliability to achieve the most demanding job specifications while maximizing machine uptime. With many enhanced features and options, the RM300 is designed to work well in both full depth reclamation and soil stabilization applications.

Maximum Operating Weight 53911 lb

Operating Specifications
Cutting/Mixing Width 96 in
Maximum Cutting/Mixing Depth 20 in
Maximum Travel Speed 6 mile/h
Operating Speed 2.7 mile/h
Rotor Options Universal, Combination, Spade
Rotor Speed - First (at 2100 Engine rpm) 106 r/min
Rotor Speed - Second (at 2100 Engine rpm) 144 r/min
Rotor Speed - Third (at 2100 Engine rpm) 216 r/min

Gross Power 350 HP
Engine Model C11 with ACERT

Ground Clearance 28.3 in
Length 32.83 ft
Maximum Height 11.08 ft
Wheel Base 20.75 ft
Width 9.83 ft

Service Refill Capacities
Fuel Tank Capacity 279 gal (US)

C11 Engine with ACERT® Technology

Cat® C11 Engine with ACERT® Technology
The C11 engine provides a full-rated gross power (SAE J1995) of 261 kW (350 hp) at 1800 rpm with a torque of 1384 Nm (1024 lb/ft). The combination of large displacement and high torque allow the RM300 to propel through the toughest materials

Mechanically-Actuated Electronically Controlled Unit Injection (MEUI)
The MEUI fuel system is a unique system that combines the technical advancement of an electronic control system with the simplicity of direct mechanically controlled unit fuel injection.

The MEUI system excels in its ability to control injection pressure over the entire engine operating speed range. These features allow the C11 to have complete control over injection timing, duration and pressure.

Multiple Injection Fuel Delivery
Multiple injection fuel delivery involves a high degree of precision. Precisely shaping the combustion cycle lowers combustion chamber temperatures, which generates fewer emissions, optimizes fuel combustion; translating into more work output for your fuel cost.

C11 Cylinder Block
The cylinder block is a one-piece, grey iron block that features generous ribbing for stiffness and heavy bearing bulkheads for rigidity and strength as the crankshaft turns. This new design supports the engine's higher compression ratios and increases its power density. The incorporation of straight-thread, o-ring connection points reduces the loss of engine oil and fluids.

High Cylinder Pressures
High cylinder pressures combined with tightly controlled tolerances promote extremely efficient fuel burn, less blow by and lower emissions.

Single Overhead Cam
One single overhead cam is driven by a gear on the flywheel end of the engine. Placing the cam gear at the flywheel end significantly reduces noise and vibration. To reduce wear, a pendulum absorber is mounted at the front of the camshaft. Together these two features contribute to the long-life and durability of this engine.

Service, Maintenance and Repair
Easier service, maintenance and repair is accomplished by monitoring key functions and logging critical indicators. Advanced electronic diagnostic capabilities are possible using Cat Electronic Technician.

Turbocharged and Air-to-Air Aftercooling (ATAAC)
The turbocharged air-to-air aftercooling system provides high horsepower with increased response time while keeping exhaust temperatures low for long hours of continuous operation.

Air-to-Air Aftercooling
Air-to-air aftercooling keeps air intake temperatures down and in concert with the tight tolerance combustion chamber components, maximizes fuel efficiency and minimizes emissions. New turbocharger, unique cross-flow head, single, rear driven, overhead cam and a more efficient intake manifold generate significant improvements in air flow. This generates significant improvements in efficiency and reduced emissions.

ADEM™ A4 Electronic Control Module
The ADEM A4 electronic control module manages fuel delivery, valve timing and airflow to get the most performance per gallon (liter) of fuel used. The control module provides flexible fuel mapping, allowing the engine to respond quickly to varying application needs. It keeps track of engine and machine conditions while keeping the engine operating at peak efficiency.

Operator's Station

Hydraulically-Assisted Sliding Platform
The hydraulically-assisted sliding platform allows the operator to position the platform to any desired position to provide good visibility to both sides of the machine. Platform can be accessed from either side of the machine.

Operator's Seat
Comfortable and durable operator's seat has adjustable fore/aft position, bottom cushion height, suspension stiffness and flip-up arm rests. Seat and side control console rotates to seven positions to enhance operator comfort.

Operating Controls
Controls are conveniently located for easy one-handed control while seated. Propel lever with center detent allows forward/reverse operation and variable machine speed.

Adjustable Steering Column
Adjustable steering column offers telescoping and tilt features to provide a comfortable operating position for the operator.

Operational Controls

Clear instrumentation includes gauges for engine oil pressure, engine coolant temperature, hydraulic oil temperature, charging system voltage and fuel level.

Analog Gauges
Large analog gauges display propel ground speed, engine rpm, engine hour meter and fault codes.

Electronic Monitoring System
Electronic Monitoring System constantly monitors input signals from sensors and switches in various machine systems and alerts the operator if a problem does occur.

Load Control Selection Switch
A load control selection switch controls propel speed manually or automatically by the ECM.

Rear Wheel Steering Control
Standard rear wheel steering control allows operator to position rear wheels for maneuvering in tight quarters. Automatic four mode steering including a crab and coordinated position is optional.

Sliding Cab (Optional)

Pressurized Iso-Mounted Cab
Iso-mounted cab is pressurized to keep noise, dust and the elements out and comfort in.

Items Included with Cab
Items included with cab are: rotating cloth seat, left and right side lockable doors, tinted glass, air conditioning, heater/defroster, dual front and rear windshield wipers and sound absorbing floor mat.

Additional Operator Comforts
Additional operator comforts include two cup holders and a 12-volt power receptacle. The cab is also radio-ready and includes a power converter, antenna with cable, two speakers and a headliner location for mounting radio.

Exceptional Viewing Area
The cab offers an exceptional viewing area to the front tire edge, mixing chamber and to the rear wheels.

Electronic Control Modules

Field-Proven Technology
Reliable field-proven technology provides maximum productivity and simplifies troubleshooting.

Electronic Control Modules (ECM)
Electronic Control Modules (ECM) receives input signals from sensors in the engine, propel, steering and rotor drive systems which monitor current operating conditions.

Self-diagnostics provides information for troubleshooting and alerts the operator of potential system problems.

Automatic Load Control
Automatic load control adjusts propel speed so that engine speed does not drop below 1800 rpm. Machine always works at peak efficiency for maximum output.

Automatic Rotor Depth Control (Optional)
Optional automatic rotor depth control provides consistent quality and performance.

Propel System

Propel Pump
Propel pump provides balanced flow to the dual displacement front drive motors. Provides superior tractive effort in soft underfoot conditions.

Load Sensing System
Load sensing system controlled by the ECM, matches propel speed to the load on rotor.

Two Speed Ranges
Two speed ranges allow the machine to operate at either maximum torque to propel the machine through the toughest conditions or a faster speed for moving around the job site.

Variable Machine Speeds
Infinitely variable machine speeds determined by the propel lever and speed control dial.

Flow Divider Control Valve
Flow divider control valve provides equal hydraulic oil flow to each drive motor to increase tractive effort in slippery conditions.

Rear Wheel Drive (Optional)

Two Propel Pump system
Two propel pump system: one pump is dedicated to drive the front wheels, while the second propel pump is dedicated to drive the rear wheels.

Tractive Effort
Increased tractive effort for those tough soil or reclamation jobs.

Flow Divider Control Valve
Flow divider control valve directs equal hydraulic flow to each rear wheel to provide all-wheel drive.

Four Wheel Drive Machine
High torque large displacement motors on rear wheels makes this a true four-wheel drive machine.

Rear Tires
Large rear tires with an aggressive tread and large footprint propels the machine easily in the most severe applications.

Rear Wheel Drive
Rear wheel drive feature can be turned on by a switch on the operator's console when maximum tractive effort is required.

Rotor Drive

Hydraulically Engaged Clutch, High Torque Mechanical Transmission and Drive Axle
Hydraulically engaged clutch, high torque mechanical transmission and drive axle allows efficient and reliable transfer of engine power to rotor and is sized to handle tough cutting and deep mixing.

Rugged Drive Chains
Rugged drive chains provide efficient, continuous power to the rotor. Single strand heavy-duty chain resists breakage.

Three Rotor Speeds
Three rotor speeds for maximum performance in a variety of materials and cutting depths. First speed is used primarily for pulverizing the material. Second and third rotor speeds can be used as blending or mixing passes.

High Capacity
High capacity rotor driveshafts and maintenance-free universal joints.

Heavy-Duty Shear Disc Or Optional Torque Limiter
Heavy-duty shear disc or optional torque limiter protects rotor drive components from torsional stress and shock loads.

Mixing Chamber

Mixing Chamber
Mixing chamber allows the rotor to move independently so that the capacity of the chamber actually increases in deeper cuts to allow better material mixing.

Mid-Machine Rotor
Mid-machine rotor uses total machine weight to help keep rotor steady in the cut for uniform depth control.

Bi-Directional Mixing
Bi-directional mixing capability increases machine efficiency.

Breaker Bars
Large heavy-duty breaker bars help achieve uniform sizing.

Hydraulically Adjustable Rear Door
Hydraulically adjustable rear door for optimum control of gradation and material uniformity.

Hydraulically Adjustable Front Door (Optional)
Optional hydraulically adjustable front door allows more precise sizing control when operating in the reverse direction.

Side Access Doors
Side access doors enable quick and simple replacement of cutting tools on rotor ends.

Hydraulic Front Door (Optional)

Hydraulically Operated Front Door
Hydraulically operated front door allows the operator to control the opening of the front door from the operator's station.

Dual Hydraulic Cylinders
Dual hydraulic cylinders offer increased lifting force and precise control of the front door.

Front Door Raises Parallel To Cutting Surface
The front door raises parallel to the cutting surface to prevent the door from plowing material in harsh soil stabilization conditions.

Forward Or Reverse Operation
Forward or reverse operation increases machine versatility in soil stabilization.

Visual Site Gauge
Visual site gauge on rotor hood displays door position and allows the operator to precisely control the opening of the front door.

Universal Rotors

Universal Rotor 41 cm (16") for Asphalt
Designed to produce maximum breakout force, the Universal Rotor 41 cm (16") performs well in severe asphalt cuts. It also cuts existing soil cement.

Universal Rotor 46 cm (18") for Soil
The Universal Rotor 46 cm (18") is designed to provide maximum mixing depth and has lower breakout force compared to the Universal Rotor 41 cm (16"). This rotor meets European 45 cm mixing depth requirements while providing the highest level of material pulverization and gradation.

Rotor Specs
  • Maximum cutting depths: 41 cm (16") or 46 cm (18")
  • Chevron-pattern bit arrangement
  • Bolt-on Breakaway bit holders
  • 200 carbide-tipped bits
  • Abrasion-resistant steel kicker paddles on every stand-off
  • 19 mm (3/4") shank bit holders

Combination Rotor

Combination Rotor
Designed for deep-cut soil mixing where pulverization and gradation is of lesser importance than higher working speeds. Performs well in cohesive soils and has a secondary application of surface mining for non-engineered substances such as coal, shale, or limestone.

Rotor Specs
  • Maximum cutting depth: 51 cm (20")
  • Replaceable end rings (weld-on bit holders only)
  • Chevron-pattern bit arrangement
  • Bolt-on Breakaway bit holders
  • 114 carbide-tipped bits
  • 22 mm (7/8") shank bit holders

Spade Rotor

Spade Rotor
The Spade Rotor blends additives with cohesive, semi-cohesive or granular materials. 58 carbide-faced quick change spade tools provide long service life and are easily replaced due to a single nut and bolt connection. This design allows the tool to break away if it strikes a solid object, preventing damage to the rotor and the rotor drive train.

Rotor Specs
  • Maximum cutting depth: 45.7 cm (18")
  • Chevron-pattern bit arrangement
  • Weld-on bit holders
  • 58 spade-type carbide-tipped bits
  • 22 mm (7/8") shank bit holders


Cooling Package
Cooling package is a multi-row modular design, stacked in series for easy access for cleaning and service. A modular stacked cooling system provides more efficient cooling of individual systems and makes replacement and routine cleaning easier. Electronically controlled on-demand variable speed cooling fan provides the lowest overall noise levels and high ambient operation capability.

Hydraulic Rotor Hood
Hydraulic rotor hood tilt rotates hood forward for convenient access to rotor for inspection and tool maintenance.

Service Doors
Hinged service doors open wide on sides of engine, rotor hood and on top deck for access to power train and rotor drive components.

Rotor Drive Chains
Self-lubricating rotor drive chains in sealed chain cases partially filled with oil.

Electronic Control Module (ECM)
Electronic Control Module (ECM) monitors machine systems and provides self-diagnostics for operator or service personnel. Three warning levels alert operator to conditions on the machine that require attention. Encourages repair before major failure. Level One - a flashing gauge indicator and a flashing alert indicator light. Level Two - level one warning plus the warning action lamp flashing. Level Three - level two warning plus the warning action horn sounds.

Visual Indicators
Visual indicators allow easy check of engine coolant, rotor axle and hydraulic oil level and air restriction indicator.

Hydraulic Test Ports
Quick-connect hydraulic test ports simplify system diagnostics.

Ecology Drains
Ecology drains provide an environmental method to drain fluids. They are included on the radiator, engine oil pan, hydraulic and fuel tank.

S•O•S Ports
S•O•S ports allow for simple fluid collection of engine oil, engine coolant and hydraulic oil.

Hose Routing
Secure hose routing with polyethylene routing blocks to reduce rubbing and increase service life.

Electrical System
Nylon braided wrap and all-weather connectors ensure electrical system integrity. Electrical wiring is color-coded, numbered and labeled with component identifiers to simplify troubleshooting.

Cat Batteries
Maintenance-free Cat batteries are mounted on the side of the machine and are accessible from ground level. Cat batteries are specifically designed for maximum cranking power and protection against vibration.

Cat Product Link System (PLS)
Machine is Product Link wire-ready. The Cat Product Link System (PLS) ensures maximum uptime and minimum repair costs by simplifying tracking of equipment fleets. Provides automatic machine location and hour updates. Can be obtained through your local Cat dealer.