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18M3 Motor Grader
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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.

Standard Equipment

Power Train

Forward/Reverse Gears
8 Forward/6 Reverse
Direct drive, power shift, countershaft
Brakes – Service
Oil-actuated, oil disc
Brakes – Service, Surface Area
27069.27 in2
Brakes – Parking
Spring applied, hydraulically released
Brakes – Secondary
Oil-actuated, oil-disc


Blade Width
18.0 ft
Moldboard – Height
31 in
Moldboard – Thickness
1 in
Arc Radius
16.3 in
Throat Clearance
5 in
Cutting Edge – Width
10 in
Cutting Edge – Thickness
1.4 in
End Bit – Width
6 in
End Bit – Thickness
0.75 in
Blade Pull – Base GVW
47216 lb
Blade Pull – Maximum GVW
52878 lb
Blade Down Pressure – Base GVW
34008 lb
Blade Down Pressure – Maximum GVW
43861 lb
Moldboard – Blade Width
18 ft


25.5 in
9.3 in
Sidewall Thickness – Inner
0.9 in
Sidewall Thickness – Outer
0.9 in
Drive Chain Pitch
2.5 in
Wheel Axle Spacing
72.5 in
Tandem Oscillation – Front Up
Tandem Oscillation – Front Down

Operating Specifications

Top Speed – Forward
32.1 mph
Top Speed – Reverse
25.3 mph
Turning Radius, Outside Front Tires
30.5 ft
Steering Range – Left/Right
Articulation Angle – Left/Right
Forward – 1st
2.8 mph
Forward – 2nd
3.8 mph
Forward – 3rd
5.5 mph
Forward – 4th
7.6 mph
Forward – 5th
11.8 mph
Forward – 6th
16.0 mph
Forward – 7th
22.0 mph
Forward – 8th
32.1 mph
Reverse – 1st
2.2 mph
Reverse – 2nd
4.1 mph
Reverse – 3rd
6.0 mph
Reverse – 4th
9.3 mph
Reverse – 5th
17.4 mph
Reverse – 6th
25.3 mph

Service Refill

Fuel Capacity
131 gal
Cooling System
18.5 gal
Hydraulic System – Total
38.6 gal
Hydraulic System – Tank
18.5 gal
Diesel Exhaust Fluid
4.2 gal
Trans./Diff./Final Drives
26 gal
Engine Oil
9.5 gal
Tandem Housing (each)
34 gal
Front Wheel Spindle Bearing Housing
0.24 gal
Circle Drive Housing
2.6 gal

Hydraulic System

Circuit Type
Electro-hydraulic load sensing, closed center
Pump Type
Variable piston
Pump Output
74 gal/min
Maximum System Pressure
3590 psi
Reservoir Tank Capacity
856 gal
Standby Pressure
*Pump output measured at 2,150 rpm. psi


Operating Weight – Typically Equipped
74324 lb
Gross Vehicle Weight – Maximum – Front Axle
74324 lb
Gross Vehicle Weight – Maximum – Rear Axle
20494 lb
Operating Weight, Typically Equipped – Front Axle
53830 lb
Operating Weight, Typically Equipped – Rear Axle
72298 lb
Gross Vehicle Weight – Base – Front Axle
19837 lb
Gross Vehicle Weight – Base – Rear Axle
52461 lb
Gross Vehicle Weight – Maximum – Total
84877 lb
Gross Vehicle Weight – Base – Total
26125 lb
Operating Weight, Typically Equipped – Total
58753 lb

Blade Range

Circle Centershift – Right
22 in
Circle Centershift – Left
27.2 in
Moldboard Sideshift – Right
31.1 in
Moldboard Sideshift – Left
29.1 in
Maximum Blade Position Angle
Blade Tip Range – Forward
Blade Tip Range – Backward
Maximum Shoulder Reach Outside of Tires – Right
103 in
Maximum Shoulder Reach Outside of Tires – Left
103 in
Maximum Lift above Ground
15.7 in
Maximum Depth of Cut
18.5 in


ISO 3450: 2011
ISO 3471: 2008/ISO 3449: 2005
ISO 6394: 2008/ISO 6395: 2008/ISO 6396: 2008
ISO 5010: 2007


Drawbar – Width
3 in
Circle – Diameter
71.7 in
Circle – Blade Beam Thickness
2 in
Drawbar – Height
8 in
Circle – Height
0.6 in
Front Frame Structure – Height
18.1 in
Front Frame Structure – Width
14.0 in
Front Axle – Height to Center
26.4 in
Front Axle – Wheel Lean, Left/Right
18° Left/17° Right
Front Axle – Total Oscillation per Side


Ripper Shank Holder Spacing
17.5 in
Ripping Depth – Maximum
17.8 in
Ripper Shank Holders
Penetration Force
30311 lb
Pryout Force
43700 lb
Machine Length Increase, Beam Raised
63.4 in


Base Power (1st gear) – Net
304 hp
Engine Model
5.1 in
6.2 in
Speed @ Rated Power
2,000 rpm
Base Power (1st gear) – Net (Metric)
309 hp
U.S. EPA Tier 4 Final/EU Stage IV/Japan 2014 (Tier 4 Final)
High Ambient – Fan Speed – Standard
Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent Emission Standards
Maximum Torque (VHP Plus)
Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent Emission Standards lb ft
Standard Capability
227-266 kW (304-357 hp) ° F
Torque Rise
VHP Plus Range – Net
VHP Plus Range – Net (Metric)
227-266 kW (309-362 hp)
VHP Plus: Gear – Net Power – Forward – 1st
38% hp
VHP Plus: Gear – Net Power – Forward – 2nd
1306 hp
VHP Plus: Gear – Net Power – Forward – 3rd
1270 hp
VHP Plus: Gear – Net Power – Forward – 4th
1270 hp
VHP Plus: Gear – Net Power – Forward – 5th
12500 hp
VHP Plus: Gear – Net Power – Forward – 6th
12176 hp
VHP Plus: Gear – Net Power – Forward – 7th
12973 hp
763 in3
Number of Cylinders
High Ambient – Fan Speed – Maximum
1,450 rpm
High Ambient – Fan Speed – Minimum
550 rpm
High Ambient Capability
122 ° F


Height – Top of Cab
147.5 in
Length – Counterweight to Ripper
29.9 in
Width – Outside Front Tires
72.5 in
Length – Front Axle to Mid Tandem
120.7 in
Length – Front Tire to Rear of Machine
290 in
Length – Front Axle to Moldboard
417 in
Length – Between Tandem Axles
474.4 in
Width – Outside Rear Tires
16.7 in
Width – Tire Center Lines
122.6 in
Height – Front Axle Center
141.1 in
Height to Exhaust Stack
106.4 in
Height to Top of Cylinders
134.3 in
Ground Clearance at Rear Axle
134.3 in


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.