The Caterpillar 12G is a motor grader designed for road construction, maintenance, and earthmoving applications. Built by Caterpillar, the 12G features a moldboard blade, articulated frame, and tandem rear drive for grading, leveling, and ditching work. It is commonly used in highway projects, site preparation, and municipal road maintenance. The machine is known for its mechanical drivetrain, operator cab, and hydraulic controls that support precise blade positioning. As a Caterpillar motor grader, the 12G is part of the company's long-running grader lineup and remains recognized in used equipment markets for grading performance and serviceability.
Circle
Caterpillar 12G Motor Grader Circle specifications
Blade Tip Angle - Front
90 degrees
Blade Tip Angle - Rear
90 degrees
Diameter
60.30 in (153.16 cm)
Max Lift Above Ground
17.30 in (43.94 cm)
Max Reach Outside Tires - Left
72.10 in (183.13 cm)
Max Reach Outside Tires - Right
73.70 in (187.20 cm)
Rotation
360 degrees
Dimensions
Caterpillar 12G Motor Grader Dimensions specifications
Blade Base
8.50 ft (2.59 m)
Height to Top of Isomount Cab
11.00 ft (3.35 m)
Overall Length
27.30 ft (8.32 m)
Tandem Axle Wheelbase
5.00 ft (1.52 m)
Wheelbase
19.50 ft (5.94 m)
Width Over Tires
8.00 ft (2.44 m)
Engine
Caterpillar 12G Motor Grader Engine specifications
Displacement
640.80 cu in (10,500.85 cu cm)
Max Power
135.00 hp (100.67 kw)
Net Power Gear 5-6
135.00 hp (100.67 kw)
Number of Cylinders
6
Power Measured @
2200 rpm
Front Axle
Caterpillar 12G Motor Grader Front Axle specifications
Ground Clearance
2.10 ft (0.64 m)
Oscillation - Total
32 degrees
Wheel Lean
18 degrees
Hydraulic System
Caterpillar 12G Motor Grader Hydraulic System specifications
Pump Flow
51.00 gpm (193.04 lpm)
Pump Type
closed-center constant-pressure system w/ variable displacement piston
Relief Valve Pressure
2150 psi
Moldboard
Caterpillar 12G Motor Grader Moldboard specifications
Max Depth of Cut
17.80 in (45.21 cm)
Moldboard Height
24.10 in (61.21 cm)
Moldboard Thickness
0.90 in (2.29 cm)
Moldboard Width
12.00 ft (3.66 m)
Side Shift Left
26.40 in (67.06 cm)
Side Shift Right
20.50 in (52.07 cm)
Operating Specifications
Caterpillar 12G Motor Grader Operating Specifications specifications
Alternator Supplied Amperage
19 amps
Cooling System Fluid Capacity
12.50 gal (47.31 l)
Fuel Capacity
74.80 gal (283.12 l)
Hydraulic System Fluid Capacity
20.10 gal (76.08 l)
Max Operation Weight - Front Axle
9,987.00 lbs (4,529.25 kg)
Max Operation Weight - Rear Axle
21,605.40 lbs (9,798.37 kg)
Max Operation Weight - Total
31,592.30 lbs (14,327.57 kg)
Oil System Fluid Capacity
7.70 gal (29.14 l)
Operating Voltage
24 volts
Std Operation Weight - Front Axle
7,870.60 lbs (3,569.43 kg)
Std Operation Weight - Rear Axle
20,128.30 lbs (9,128.48 kg)
Std Operation Weight - Total
27,998.80 lbs (12,697.87 kg)
Tandem Case Fluid Capacity (each)
17.00 gal (64.35 l)
Transmission Fluid Capacity
23.00 gal (87.06 l)
Steering System
Caterpillar 12G Motor Grader Steering System specifications
Articulation Angle
50 degrees
Turning Radius
24.00 ft (7.32 m)
Transmission
Caterpillar 12G Motor Grader Transmission specifications
Max Speed - Forward
25.50 mph (41.04 kph)
Max Speed - Reverse
25.50 mph (41.04 kph)
Number of Gears - Forward
6
Number of Gears - Reverse
6
Transmission Type
Cat-built direct drive power shift
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