18M3 Motor Grader 18M3 Motor Grader
18M3 Motor Grader 18M3 Motor Grader
18M3 Motor Grader 18M3 Motor Grader
18M3 Motor Grader 18M3 Motor Grader
Cat® 16M3 and 18M3 Mining Motor Graders Cat® 16M3 and 18M3 Mining Motor Graders
Advanced Control Joysticks | Cat® Motor Graders Advanced Control Joysticks | Cat® Motor Graders
Cat® M Series Motor Graders | Integrated Technologies Cat® M Series Motor Graders | Integrated Technologies


Base Power (1st Gear) - Net304 HP (227 kW)
Engine ModelCat® C13 ACERT™ VHP
Bore5.1 in (130 mm)
Stroke6.2 in (157 mm)
The 18M3 builds on the success of the 16M and offers additional power, a wider moldboard and the possibility to use a more aggressive blade angle, making it an ideal fit for mining operations that run 172-tonne (190-ton) or smaller trucks. The 18M3 enhances operational efficiencies by increasing coverage and reducing the number of passes required to complete the width of the road in certain applications. The 18M3 includes features that provide large benefits on operating cost reduction, uptime & performance improvements as well as enhanced safety.


Base Power (1st Gear) - Net304 HP (227 kW)
Engine ModelCat® C13 ACERT™ VHP
Bore5.1 in (130 mm)
Stroke6.2 in (157 mm)
Speed at Rated Power2,000 rpm
Base Power (1st Gear) - Net - Metric309 HP (227 kW)
Derating Altitude - Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent12973 ft (3954 m)
Derating Altitude - Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent12176 ft (3711 m)
Derating Altitude - Tier 4/Stage IV/Japan 2014 (Tier 4 Final)12500 ft (3810 m)
Emissions (1)U.S. EPA Tier 4 Final/EU Stage IV/Japan 2014 (Tier 4 Final)
Emissions (2)Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent Emission Standards
Emissions (3)Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent Emission Standards
Maximum Torque - ISO 9249 - Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent1270 lb/ft (1721 N·m)
Maximum Torque - ISO 9249 - Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent1270 lb/ft (1721 N·m)
Maximum Torque - ISO 9249 - Tier 4/Stage IV/Japan 2014 (Tier 4 Final)1306 lb/ft (1771 N·m)
Standard - Ambient Capability122 °F (50 °C)
Standard - Fan Speed - Maximum1,450 rpm
Standard - Fan Speed - Minimum550 rpm
Torque Rise - Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent38%
Torque Rise - Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent38%
Torque Rise - Tier 4/Stage IV/Japan 2014 (Tier 4 Final)40%
VHP Range - Net227-266 kW (304-357 hp)
VHP Range - Net - Metric227-266 kW (309-362 hp)
Displacement763 in³ (12.5 l)
Number of Cylinders6
Forward/Reverse Gears8 Forward/6 Reverse
TransmissionDirect drive, power shift, countershaft
Brakes - Dynamic Brake Torque per Wheel27069.27 lb/ft (36701 N·m)
Brakes - ParkingSpring applied, hydraulically released
Brakes - SecondaryOil-actuated, oil-disc
Brakes - ServiceOil-actuated, oil disc
Circuit TypeElectro-hydraulic load sensing, closed center
Pump TypeVariable piston
Maximum System Pressure3590 psi (24750 kPa)
Standby Pressure856 psi (5900 kPa)
Note*Pump output measured at 2,150 rpm.
Pump Output*74 gal/min (280 l/min)
Articulation Angle - Left/Right20°
Forward - 1st2.8 mile/h (4.5 km/h)
Forward - 2nd3.8 mile/h (6.1 km/h)
Forward - 3rd5.5 mile/h (8.9 km/h)
Forward - 4th7.6 mile/h (12.3 km/h)
Forward - 5th11.8 mile/h (19 km/h)
Forward - 6th16 mile/h (25.8 km/h)
Forward - 7th22 mile/h (35.5 km/h)
Forward - 8th32.1 mile/h (51.7 km/h)
Reverse - 1st2.2 mile/h (3.6 km/h)
Reverse - 2nd4.1 mile/h (6.6 km/h)
Reverse - 3rd6 mile/h (9.7 km/h)
Reverse - 4th9.3 mile/h (15 km/h)
Reverse - 5th17.4 mile/h (28 km/h)
Reverse - 6th25.3 mile/h (40.8 km/h)
Steering Range - Left/Right47.5°
Top Speed - Forward32.1 mile/h (51.7 km/h)
Top Speed - Reverse25.3 mile/h (40.8 km/h)
Turning Radius - Outside Front Tires30.5 ft (9.3 m)
Fuel Capacity131 gal (US) (496 l)
Cooling System18.5 gal (US) (70 l)
DEF Tank4.2 gal (US) (16 l)
Hydraulic System - Tank18.5 gal (US) (70 l)
Hydraulic System - Total38.6 gal (US) (146 l)
Engine Oil9.5 gal (US) (36 l)
Transmission - Differential - Final Drives26 gal (US) (98.5 l)
Tandem Housing - Each34 gal (US) (129 l)
Front Wheel Spindle Bearing Housing0.24 gal (US) (0.9 l)
Circle Drive Housing2.6 gal (US) (10 l)
Circle - Blade Beam Thickness2 in (50 mm)
Circle - Diameter71.7 in (1822 mm)
Drawbar - Height8 in (203 mm)
Drawbar - Width3 in (76 mm)
Front Axle - Height to Center26.4 in (670 mm)
Front Axle - Total Oscillation per Side35°
Front Axle - Wheel Lean18° Left/17° Right
Front Frame Structure - Height18.1 in (460 mm)
Front Frame Structure - Thickness0.6 in (14 mm)
Front Frame Structure - Width14 in (356 mm)
Sidewall Thickness - Inner0.9 in (22 mm)
Sidewall Thickness - Outer0.9 in (22 mm)
Tandem Oscillation - Front Down25°
Tandem Oscillation - Front Up15°
Height25.5 in (648 mm)
Width9.3 in (236 mm)
Drive Chain Pitch2.5 in (63.5 mm)
Wheel Axle Spacing72.5 in (1841 mm)
Blade Width18 ft (5.5 m)
Arc Radius16.3 in (413 mm)
Throat Clearance5 in (126 mm)
Blade Pull* - Base GVW47216 lb (21417 kg)
Blade Pull* - Maximum GVW52878 lb (23985 kg)
Cutting Edge Thickness1.4 in (35 mm)
Cutting Edge Width10 in (254 mm)
Down Force - Base GVW34008 lb (15426 kg)
Down Force - Maximum GVW43861 lb (19895 kg)
End Bit - Thickness0.75 in (19 mm)
End Bit - Width6 in (152 mm)
Height31 in (787 mm)
Thickness1 in (25 mm)
Width18 ft (5.5 m)
Maximum Blade Position Angle65°
Maximum Lift Above Ground15.7 in (400 mm)
Maximum Depth of Cut18.5 in (470 mm)
Blade Tip Range - Backward
Blade Tip Range - Forward40°
Circle Centershift - Left27.2 in (690 mm)
Circle Centershift - Right22 in (560 mm)
Maximum Shoulder Reach Outside of Tires - Left103 in (2605 mm)
Maximum Shoulder Reach Outside of Tires - Right103 in (2605 mm)
Moldboard Sideshift - Left29.1 in (740 mm)
Moldboard Sideshift - Right31.1 in (790 mm)
Ripping Depth - Maximum17.8 in (452 mm)
Shank Holder Spacing - Minimum17.5 in (445 mm)
Ripper Shank Holders7
Penetration Force30311 lb (13749 kg)
Pry-Out Force43700 lb (19822 kg)
Machine Length Increase, Beam Raised63.4 in (1610 mm)
Operating Weight - Typically Equipped74324 lb (33713 kg)
Gross Vehicle Weight - Base** - Front Axle19837 lb (8998 kg)
Gross Vehicle Weight - Base** - Rear Axle52461 lb (23796 kg)
Gross Vehicle Weight - Base** - Total72298 lb (32794 kg)
Gross Vehicle Weight - Maximum Tested - Front Axle26125 lb (11850 kg)
Gross Vehicle Weight - Maximum Tested - Rear Axle58753 lb (26650 kg)
Gross Vehicle Weight - Maximum Tested - Total84877 lb (38500 kg)
Gross Vehicle Weight - Typically Equipped - Front Axle20494 lb (9296 kg)
Gross Vehicle Weight - Typically Equipped - Rear Axle53830 lb (24417 kg)
Gross Vehicle Weight - Typically Equipped - Total74324 lb (33713 kg)
Ground Clearance - Rear Axle16.7 in (423 mm)
Height - Exhaust Stack141.1 in (3584 mm)
Height - Front Axle Center29.9 in (760 mm)
Height - Top of Cab147.5 in (3746 mm)
Height - Top of Cylinders122.6 in (3115 mm)
Length - Between Tandem Axles72.5 in (1841 mm)
Length - Counterweight to Ripper474.4 in (12051 mm)
Length - Front Axle to Mid Tandem290 in (7365 mm)
Length - Front Axle to Moldboard120.7 in (3066 mm)
Length - Front Tire to Rear of Machine - Including Tow Hitch417 in (10593 mm)
Width - Outside Front Tires134.3 in (3411 mm)
Width - Outside Rear Tires134.3 in (3411 mm)
Width - Tire Center Lines106.4 in (2703 mm)
BrakesISO 3450: 2011
ROPS/FOPSISO 3471: 2008/ISO 3449: 2005
SoundISO 6394: 2008/ISO 6395: 2008/ISO 6396: 2008
SteeringISO 5010: 2007
Optimized VHP Range - Net227-266 kW (304-357 hp)
Note*Blade pull calculated at 0.9 traction coefficient, which is equal to ideal no-slip conditions, and Gross Machine Weight.
NoteCalculated with no slip and 23.5R25 L-3 tires.
Wheel Group - 19.5×25 MP (1)Tires: 23.5R25 Bridgestone VKT 2 Star
Wheel Group - 19.5×25 MP (2)Tires: 23.5R25 Bridgestone VKT 1 Star
Wheel Group - 19.5×25 MP (3)Tires: 23.5R25 Bridgestone VJT 1 Star
Wheel Group - 19.5×25 MP (4)Tires: 23.5R25 Michelin XHA 2 Star
Wheel Group - 19.5×25 MP (5)Tires: 23.5R25 Michelin XLDD 2 Star L5
Shank Holder Spacing - Maximum20 in (500 mm)
Gear - Forward 1st309 HP (227 kW)
Gear - Forward 2nd309 HP (227 kW)
Gear - Forward 3rd315 HP (232 kW)
Gear - Forward 4th325 HP (239 kW)
Gear - Forward 5th332 HP (244 kW)
Gear - Forward 6th341 HP (251 kW)
Gear - Forward 7th347 HP (255 kW)
Gear - Forward 8th362 HP (266 kW)
Gear - Reverse 1st309 HP (227 kW)
Gear - Reverse 2nd309 HP (227 kW)
Gear - Reverse 3rd-6th315 HP (232 kW)
Gear - Forward 1st304 HP (227 kW)
Gear - Forward 2nd304 HP (227 kW)
Gear - Forward 3rd311 HP (232 kW)
Gear - Forward 4th321 HP (239 kW)
Gear - Forward 5th327 HP (244 kW)
Gear - Forward 6th337 HP (251 kW)
Gear - Forward 7th342 HP (255 kW)
Gear - Forward 8th357 HP (266 kW)
Gear - Reverse 1st304 HP (227 kW)
Gear - Reverse 2nd304 HP (227 kW)
Gear - Reverse 3rd-6th311 HP (232 kW)
Note (1)*No Tier 4 Final/Stage IV/Japan 2014 (Tier 4 Final) emission engine: subtract 150 kg (331 lb) from rear axle wt. & total wt.
Note (2)**Base operating weight calculated on standard machine configuration with 23.5R25 tires, full fuel tank operator and rops cab.

Benefits and Features

You measure profitability by the ore you produce – and the more cost effectively you do that, the more successful you are. While drills, draglines, loaders and haul trucks are responsible for producing ore, motor graders have a direct impact on how productively these machines can operate – in particular in their role in haul road maintenance.

  • 18 Foot Moldboard – The 18M3 includes a standard 18 foot moldboard and straight 10 inch by 1 3/8 inch cutting edge, which allows the operator to increase coverage by 12.5% compared to a 16 foot moldboard. Also the operator can us a more aggressive blade angle and still be able to deposit the windrow away from the tires to protect tire life. The use of a more aggressive blade angle results in reduced load on the machine and the ability to better maintain ground speed for enhanced performance.
  • 18M3 Power Levels and Optimized Variable Horse Power (VHP) – Compared to the 16M3, the 18M3 has on average 5% more power. The additional power combined with the 18 foot moldboard and proper weight balance provides the best combination of performance and coverage. The Optimized Variable Horse Power (VHP) is designed to provide the ideal amount of power in all gears to efficiently perform diverse motor grader applications while protecting structure and drive train components.
  • Machine Balance – With optimized combination of weight and balance the 18M3 delivers enhanced traction and the ability to keep ground speed, especially when carrying a large load on the board.
  • Simple, Operator Friendly Emissions Technology – The 18M3 is available with three variations of the C13 engine with ACERT™ Technology. One meets U.S. EPA Tier 4 Final / EU Stage IV / Japan 2014 (Tier 4 Final) emissions standards and is required for sale in higher regulated countries. The other options will be capable of meeting Tier 2 / Stage II / Japan 2001 (Tier 2) equivalent emission standards or Tier 3 / Stage IIIA / Japan 2006 (Tier 3) equivalent emission standards, depending on the emission standards of the specific country. Emissions reduction technology on the 18M3 Motor Grader is designed to be transparent, with no action required from the operator.
  • Rear Ripper / Scarifier – Made to penetrate tough material fast and rip thoroughly for easier movement with the moldboard. The 18M3 includes a standard ripper with three shanks with the ability to add four more for additional versatility.
  • Comfort and Control – The multi-color / touch screen Information Display is the operator's gateway to monitoring machine performance, a convenient way of modifying machine parameters to tailor performance to the current task and access the service information for initial troubleshooting.
  • Monitor, Manage, and Enhance Job Site Operations – Cat Product Link™ Elite is deeply integrated into your machine, helping you take the guesswork out of equipment management. Easy access to timely information like machine location, hours, fuel usage, idle time and event codes via the online VisionLink® user interface can help you effectively manage your fleet and lower operating cost.

High mechanical availability is one of your top concerns. The 18M3 helps reduce downtime and operating cost through improved serviceability, fuel economy and reduced maintenance. Major components are modular in design, so most can be removed and reinstalled without disturbing other components.

  • Use Less Fuel – Engine Economy (ECO) Mode improves fuel economy by reducing high idle engine speed while maintaining machine power. ECO Mode controls the high engine idle speed (capped at 1,900 rpm in working gears) to ensure the engine is performing as efficiently as possible with respect to fuel consumption. ECO Mode could provide significant fuel consumption savings especially in operations that are typically run at light to moderate loads, high idle and gear usage between 3R to 5F.
  • Engineered for Maximum Production and Service Life – The center shift section of the front frame is made of heavy duty steel casting which improves stress distribution to this high load area for enhanced durability. The rear frame structure is lengthened to provide easy service access to components in the engine enclosure as well as improve machine balance. Front axle steering cylinder has been designed to enhance durability and hydraulic hoses have been routed to improve reliability.
  • Standard Front Axle Guard – A front guard helps protect the front axle from rocks or other debris that could damage the axle or its components.
  • Standard Transmission Guard – The transmission guard provides a steel protection from ground debris.
  • Ease of Maintenance – The modular cooling package makes for simple removal and installation of components on the cooling system which reduces service time. Engine enclosure doors provide complete and easy access to the engine without the impediment of any enclosure post. Also, extended maintenance intervals reduce the number of touches and downtime.
  • Protecting Your Asset – Ok to Start and critically low fluid monitoring systems help prevent critical components from damage when low fluid levels are present. All information is available via the Information Display within the cab, and diagnostic codes are logged.

You consider the safety of your workers a top priority, and we're doing our best to help you meet your safety goals. Caterpillar considers the safety of everyone in, on or around Cat equipment when developing new products or enhancing safety features for existing products. The 18M3 has numerous safety features such as but not limited to:

  • Access to Tandem
  • Light Emitting Diode (LED) Enclosure Service Lights
  • Seat Belt Indication
  • Fire Suppression Ready System
  • Rearview Camera
  • Access Platform – optional
  • Service Access Platform – optional

Your local Cat dealer is committed to helping you succeed, by ensuring you have the right machine for the job, making parts available, and providing you with versatile work tools.

Standard Equipment

  • Adjustable electric arm rest
  • Air cleaner, dual stage dry type radial seal with service indicator through messenger and automatic dust ejector
  • Front axle cylinder guard
  • Alternator, 150 ampere, sealed
  • Alarm, back up
  • 3-bolt blade bracket
  • 5.5 m (18 ft) blade with flat cutting edge 254 mm × 35 mm (10 in × 13⁄8 in)
  • A partial allowance for tires on 597 mm × 609.6 mm (23.5 in × 24 in) multi-piece rims is included in the base machine price and weight
  • Extended Life Coolant to –35° C (–31° F)

Optional Equipment

  • Comfort package
  • Transmission, autoshift
  • Debris guard
  • Additional monitor for rearview camera
  • Auto-lube, Centro-matic
  • 5.5 m (18 ft) blade with curved cutting edge 203 mm × 25 mm (8 in × 1 in)
  • Coolant, –51° C (–60° F)