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Caterpillar 18

Configuration: Base configuration: 23.5R25 tires, full fuel, operator, ROPS cab, 5.5 m (18 ft) moldboard; Tier 4 Final/Stage V engine.

26 sourced values · Sources: Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25

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Dimension diagram

A B C D E F Side viewFront view Schematic, not to scale
AOverall length10,593 mm
BOverall height3,746 mm
CWheelbase7,365 mm
DGround clearance423 mm
EOverall width3,411 mm
FTrack gauge / tread2,703 mm

Weights

SpecValueSource
Operating weight32,794 kg
Published: 32,794 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Gross vehicle weight, base (72,298 lb), Tier 4 Final. Typically equipped 33 713 kg. Non-T4F machines: subtract 150 kg.
Max gross (laden) weight38,500 kg
Published: 38,500 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Gross vehicle weight - maximum tested (84,877 lb).

Dimensions

SpecValueSource
Overall length10,593 mm
Published: 10,593 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Front tire to rear of machine, includes tow hitch. Counterweight to ripper 12 051 mm.
Overall width3,411 mm
Published: 3,411 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Width outside front/rear tires.
Overall height3,746 mm
Published: 3,746 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Height to top of cab.
Wheelbase7,365 mm
Published: 7,365 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Front axle to mid tandem. Between tandem axles 1841 mm.
Track gauge / tread2,703 mm
Published: 2,703 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Width, tire center lines.
Ground clearance423 mm
Published: 423 mm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
At rear axle.
Turning radius≈ 9,300 mm
Published: 9.3 m
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Outside front tires (30'6").

Undercarriage / tires

SpecValueSource
Undercarriage typeWheeled, articulated frame, tandem rear
Published: Wheeled, articulated frame, tandem rear
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Number of axles3
Published: 3
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Front axle plus tandem rear.
Wheels (count)6
Published: 6
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Tire size23.5R25
Published: 23.5R25
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
On 19.5x25 MP wheels.

Ground pressure

SpecValueSource
Ground pressureNot publishedCat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Not published in this document.

Axle loads

SpecValueSource
Axle load, front (unladen/operating)8,998 kg
Published: 8,998 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Base GVW.
Axle load, rear (unladen/operating)23,796 kg
Published: 23,796 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Base GVW (tandem).
Axle load, front (laden/max)11,850 kg
Published: 11,850 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Gross vehicle weight - maximum tested.
Axle load, rear (laden/max)26,650 kg
Published: 26,650 kg
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Gross vehicle weight - maximum tested (tandem).

Engine

SpecValueSource
Engine modelCat C13 VHP
Published: Cat C13 VHP
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
U.S. EPA Tier 4 Final/EU Stage V/Japan 2014; Tier 3 and Tier 2 equivalent versions also listed.
Net power227 kW
Published: 227 kW
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Base power (1st gear), net ISO 9249 (304 hp); VHP range 227-266 kW.
Gross power272 kW
Published: 272 kW
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
ISO 14396 declared power, Tier 4 Final, at 2,000 rpm (365 hp).
Displacement12.5 L
Published: 12.5 L
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
763 in³.
Rated speed2,000 rpm
Published: 2,000 rpm
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25

Hydraulics

SpecValueSource
Pump / aux flow280 L/min
Published: 280 L/min
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Variable piston pump output measured at 2,150 rpm (74 gal/min).
System / relief pressure≈ 24.8 MPa
Published: 24,750 kPa
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Maximum system pressure (3,590 psi). Standby 5900 kPa.

Performance

SpecValueSource
Max travel speed51.7 km/h
Published: 51.7 km/h
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Top speed forward, 8th gear (32.1 mph).
Blade / moldboard width≈ 5,500 mm
Published: 5.5 m
Cat 18 Motor Grader brochure/specifications AEHQ7639-02 (01-2023); Cat C13 VHP, U.S. EPA Tier 4 Final/EU Stage V/Japan 2014 column. Retrieved 2026-10-25
Moldboard width (18 ft).

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