The 12H blends productivity and durability to give you the best return on your investment. The Cat® C-9 engine, direct-drive power shift transmission and load-sensing hydraulics are perfectly balanced, working together to deliver top productivity in all applications.

Base Power (1st gear) - Net 144.83 hp
Engine Model Cat® C-9 ETA VHP
VHP - gears 4-8 Net 165.0 hp
VHP Plus - gears 1-3 Net 145.0 hp
VHP Plus - gears 4-6 Net 165.0 hp
VHP Plus - gears 7-8 Net 185.0 hp
Base Power (all gears) Gross 156.0 hp
VHP - gears 1-3 Gross 156.0 hp
VHP - gears 4-8 Gross 176.0 hp
VHP Plus - gears 1-3 Gross 156.0 hp
VHP Plus - gears 4-6 Gross 176.0 hp
VHP Plus - gears 7-8 Gross 196.0 hp
Bore 4.4 in
Stroke 5.9 in
Speed @ Rated Power 2000 RPM
Base Power (all gears) - Net 145.0 hp
Maximum Torque 728.71 lb ft
Torque Rise 50%
Displacement 537.0 in3
VHP - gears 1-3 Net 145.0 hp
Number of Cylinders 6
Derating Altitude 10000.0 ft
Standard - Fan Speed - Maximum 1210 RPM
Standard - Fan Speed - Minimum 500 RPM
High Ambient - Fan Speed - Maximum 1350 RPM
High Ambient - Fan Speed - Minimum 500 RPM
High Ambient Capability 122.0 ° F

Gross Vehicle Weight - Maximum - Total 45818.0 lb
Gross Vehicle Weight - Maximum - Front Axle 13744.0 lb
Gross Vehicle Weight - Maximum - Rear Axle 32074.0 lb
Gross Vehicle Weight - Base - Front Axle 8346.0 lb
Gross Vehicle Weight - Base - Rear Axle 22974.0 lb
Gross Vehicle Weight - Base - Total 31320.0 lb

Blade Width 12.0 ft
Moldboard - Height 24.0 in
Moldboard - Thickness 0.87 in
Arc Radius 16.25 in
Throat Clearance 4.7 in
Cutting Edge - Width 6.0 in
Cutting Edge - Thickness 0.63 in
End Bit - Width 6.0 in
End Bit - Thickness 0.63 in
Blade Pull - Base GVW 20677.0 lb
Blade Pull - Maximum GVW 28867.0 lb
Blade Down Pressure - Base GVW 14447.0 lb
Blade Down Pressure - Max GVW 23800.0 lb

Height - Top of Cab 122.0 in
Height - high profile cab 131.0 in
Height - no cab 122.0 in
Length - counterweight to ripper 394.2 in
Width - Outside Front Tires 96.0 in
Length - Front Axle to Mid Tandem 239.6 in
Length - Front Tire to Rear of Machine 337.4 in
Length - Front Axle to Moldboard 101.3 in
Length - Between Tandem Axles 60.0 in
Width - Outside Rear Tires 95.3 in
Width - Tire Center Lines 81.8 in
Height - Front Axle Center 23.4 in
Height to Exhaust Stack 122.0 in
Height to Top of Cylinders 119.0 in
Ground Clearance at Rear Axle 13.4 in

Operating Specifications
Top Speed - Forward 27.4 mph
Top Speed - Reverse 21.6 mph
Turning Radius, Outside Front Tires 24.25 ft
Steering Range - Left/Right 50 degrees
Articulation Angle - Left/Right 20 degrees
Forward - 1st 2.3 mph
Forward - 2nd 3.2 mph
Forward - 3rd 4.6 mph
Forward - 4th 6.4 mph
Forward - 5th 10.0 mph
Forward - 6th 13.7 mph
Forward - 7th 18.8 mph
Forward - 8th 27.4 mph
Reverse - 1st 1.8 mph
Reverse - 2nd 3.5 mph
Reverse - 3rd 5.0 mph
Reverse - 4th 7.9 mph
Reverse - 5th 14.8 mph
Reverse - 6th 21.6 mph

Service Refill
Fuel Capacity 100.0 gal
Cooling System 11.6 gal
Hydraulic System - Total 19.5 gal
Hydraulic System - Tank 9.9 gal
Engine Oil 6.3 gal
Transmission/Differential/Final Drives 12.2 gal
Tandem Housing (each) 16.9 gal
Front Wheel Spindle Bearing Housing 0.13 gal
Circle Drive Housing 1.8 gal

Power Train
Forward/Reverse Gears 8 fwd / 6 rev
Transmission Direct drive, power shift
Brakes - Service Air actuated multiple oil disc
Brakes - Service, Surface Area 3712.0 in2
Brakes - Parking Air-actuated, multiple oil-disc
Brakes - Secondary Dual circuit

Hydraulic System
Circuit Type Closed center load sense
Pump Type Variable piston
Pump Output 51.9 gal/min
Maximum System Pressure 3500.0 psi
Reservoir tank capacity 10.04 gal
Standby Pressure 450.0 psi

Circle - Diameter 60.2 in
Circle - Blade Beam Thickness 1.2 in
Drawbar - Height 5.0 in
Front-Top/Bottom Plate - Width 12.0 in
Front-Top/Bottom Plate - Thickness 1.0 in
Front-Side Plates - Width 9.5 in
Front-Side Plates - Thickness 0.5 in
Front-linear weights - min 112.0 lb/ft
Front-linear weights - max 144.0 lb/ft
Front-section modulus - min 127.0 in3
Front-section modulus - max 291.0 in3
Front Axle - Height to Center 23.75 in
Front Axle - Wheel Lean, Left/Right 18°
Front Axle - Total Oscillation per Side 32°

Blade Range
Circle Centershift - Right 28.7 in
Circle Centershift - Left 27.4 in
Moldboard Sideshift - Right 26.0 in
Moldboard Sideshift - Left 20.6 in
Maximum Blade Position Angle 90°
Blade Tip Range - Forward 40°
Blade Tip Range - Backward
Maximum Shoulder Reach Outside of Tires - Right 71.2 in
Maximum Shoulder Reach Outside of Tires - Left 73.6 in
Maximum Lift above Ground 18.9 in
Maximum Depth of Cut 28.9 in

Front, V-Type - Scarifier shank holder spacing 4.6 in
Front, V-Type - Scarifier shank holders 11
Front, V-Type - Scarifying depth, maximum 11.5 in
Front, V-Type: Working width 46.6 in
Front, straight: Working width 71.0 in
Front, straight: Scarfying depth, maximum 12.5 in
Front, straight: Scarifier shank holders 17
Front, straight: Scarifier shank holder spacing 4.38 in
Rear - Working Width 91.0 in
Rear - Scarifier Shank Holders 9
Rear - Scarifier Shank Holder Spacing 10.5 in

Ripping Depth - Maximum 18.2 in
Ripper Shank Holders 5
Shank Holder Spacing - Minimum 21.0 in
Penetration Force 17740.0 lb
Pryout Force 20460.0 lb
Machine Length Increase, Beam Raised 38.2 in

Height 19.9 in
Width 7.9 in
Sidewall Thickness - Inner 0.63 in
Sidewall Thickness - Outer 0.71 in
Drive Chain Pitch 2.0 in
Wheel Axle Spacing 60.0 in
Tandem Oscillation - Front Up 15°
Tandem Oscillation - Front Down 25°

Caterpillar® engines deliver increased performance and lower operating costs.

Cat C-9 DITA ATAAC Engine
The innovative Cat C-9 diesel engine delivers large-engine performance from a compact engine design. This six-cylinder engine is turbocharged and air-to-air aftercooled. With high displacement and low rated speed, the C-9 provides excellent fuel economy and durability that can significantly reduce operating costs.

Power Train
Matched Caterpillar components deliver smooth, responsive performance and reliability.

Power Train

Power Shift Transmission
Designed and built specifically for Cat motor graders, the rugged transmission provides on-the-go, full-power shifting as well as inching capability.

Caterpillar multi-disc brakes offer a large surface area for dependable, extended-life braking. The air-actuated service brakes, located in each of the four wheel spindle housings, are sealed, adjustment free, and lubricated and cooled by tandem housing oil. The parking/emergency brakes, located in the transmission on the output shaft, are spring actuated and air pressure released. When engaged, they neutralize the transmission and lock the wheels.

Balanced hydraulics deliver consistent, precise and responsive control.


Load Sensing Hydraulics
A load sensing variable displacement pump and the advanced proportional priority pressure-compensating (PPPC, or "triple-PC") hydraulic valves provide superior implement control and enhanced machine performance and efficiency. Continuously matching hydraulic flow and pressure to power demands creates less heat and reduces power consumption.

Implement Control Valves
PPPC valves have different flow rates for the head and rod ends of the cylinder. This insures consistent extension and retraction properties for each cylinder, and improves operator 'feel' and system response. All control valves use lock valves to maintain blade settings. Line relief valves protect cylinders from excessive pressure.

Balanced Flow
Hydraulic flow is proportioned to ensure all implements operate simultaneously. If demand exceeds pump capacity, all cylinders are reduced by the same ratio. The result is improved productivity in virtually any application.

Blade Float
Blade float, incorporated into the blade lift control valves, allows the blade to move freely under its own weight. By floating both cylinders, the blade can follow the contours of the road when removing snow. Floating only one cylinder permits the toe of the blade to follow a hard surface while the operator controls the slope with the other lift cylinder.

Independent Oil Supply
Large separate hydraulic oil supply prevents cross-contamination and provides proper oil cooling, which reduces heat build-up and extends component life.

Heavy Duty XT™ Hose
Caterpillar hose technology allows high pressures for maximum power and reduced downtime, while excellent routing minimizes exposure to damage.

Optional Hydraulic Lockout
Mechanically locks all moldboard, machine, and attachment control levers during machine roading. This prevents implements from being accidentally engaged when the motor grader is traveling down the road.

Drawbar, Circle, Moldboard
Every component is designed for maximum productivity and durability.

Heat treated moldboard rails, through-hardened, curved DH-2™ steel cutting edge and end bits, and replaceable metallic wear inserts assure a long, reliable service life. Three sideshift mounting locations for the optional moldboard add flexibility.

Blade Positioning
The blade linkage design provides extensive moldboard positioning, most beneficial in mid-range bank sloping and in ditch cutting and cleaning.

Circle Construction
One-piece forged circle with hydraulically driven motor stands up to high stress loads. Raised wear surfaces prevent circle teeth wear against the drawbar. Sixty-four uniformly spaced teeth on the front 240° of the circle are flame cut and heat induction hardened to resist wear. And the circle, with 360° rotation, is secured to the drawbar by six vertically and horizontally adjustable shoes for maximum support.

Drawbar Construction
The Y-frame drawbar is constructed of two solid beams for high strength and optimum durability, as well as precise blading control. And the yoke plate completely covers the top of the circle.

Blade Lift Accumulators
Optional blade lift accumulators absorb vertical shocks encountered when the moldboard contacts immovable objects. This option is especially useful in rough grading and rocky areas.

The 12H frame is designed and built to exceed the expectations of the customer.


Integrated Bumper
The integrated bumper ties the rear frame together into a cohesive unit to provide a solid platform for the C-9 power train. This is especially important in ripping and snow removal applications where graders are equipped with snow wing attachments.

Rear Frame
Rear frame has two box-sectioned channels integral with fully welded differential case for a solid working platform.

Front Frame
Continuous top and bottom plate construction provides consistency and strength. The flanged box section design removes welds from high stress areas, improving reliability and durability, and increasing resale values for the customer.

Re-engineered inspection and service points save time and expense.


Service Center
A 'Service Center' on the left-hand side provides easy, centralized access to most check and maintenance points. Routine inspection and service are faster and easier, for better machine availability and lower operating costs.
  • Large hinged doors provide easy access to the adjacent engine and maintenance service compartments.
  • Engine and hydraulic oil checkpoints, coolant gauges, and air filters
  • Tandem oil checkpoint
  • Spin-on filters for oils, fuel, coolant
  • Remote lubrication points, purge valves and ecology drain lines
  • Sample ports for engine, hydraulic, transmission fluids, coolant and fuel, encourages preventive maintenance and diagnostics like the S·O·SSM Analysis program.

Fuel Tank
The 378 L (100 gal) ground level fuel tank allows longer work shifts and reduces refueling times. An easily accessible fuel tank sediment drain enables the operator to remove sediment accumulation, reducing the risk of fuel system damage.

Extended Oil Change Interval
Operate a full 500 hours between engine oil and filter changes, 4000 hours between hydraulic oil changes, and 6000 hours between engine coolant changes. This reduces downtime and operating expense.

Cat XT Hose
Caterpillar XT hose technology allows high pressures for maximum power and reduced downtime, while excellent routing minimizes exposure to damage.

O-Ring Face Seals
Cat O-ring face seals assure rock-solid connections that maintain pressure and reduce oil leaks. Intelligent hose routing minimizes exposure to damage, increasing hose life and enhancing reliability.

Radiator Cleanout Access
Radiator clean-out access gives the operator the ability to clear away debris and other materials that build up around the radiator. This ensures that the radiator functions properly keeping the engine cool and increasing component life.

Operator's Station
The 12H includes innovative changes to improve operator efficiency and, in turn, greater machine productivity.

Operator's Station

Comfort and Convenience
Comfort and convenience are designed into every feature of the operator's station.

Exceptional Visibility
Operator's console was redesigned, and large side windows allow a clear view of the moldboard heel and tandem tires. The 12H has a wide rear window and tapered engine hood. The air dryer and air leaner were moved, and the precleaner and muffler were aligned. Operators can work more confidently and efficiently.

Environmentally Responsible Design
Caterpillar builds machines that help you create a better world.

Environmentally Responsible Design

Quiet Cab
The resiliently mounted engine and transmission reduce interior engine noise and vibration. With the sound suppression group, interior sound levels are 75dB(A), per ISO 6394. Lower interior noise levels improve operator working conditions.

Quiet Machine
Exterior sound levels are 109dB(A) per ISO 6395. The sound suppression group lowers exterior sound levels below 108dB(A), complying with the EU 2000/14/EC sound limit of 109 dB(A). This quiet operation lets the 12H work with minimal disturbance to the surroundings.

Low Emissions
The 12H Motor Grader is even more environmentally friendly than its predecessors with reductions in NOx, hydrocarbon, and particulate emissions. It meets or exceeds all U.S. EPA Tier 2 and EU Stage II emissions control standards worldwide.

Fuel Efficient
Caterpillar state-of-the-art electronically controlled, unit injection fuel system has high injection pressure for complete fuel combustion, increased fuel efficiency and reduced emissions.

Dry Machine
Lubricant fill points and filters are designed to minimize spillage. O-ring face seals, Cat XT hose and Cat hydraulic cylinders protect against leaks.

Ozone Protection
To help protect the earth’s ozone layer, air-conditioning units use a refrigerant free of chlorofluorocarbons (CFCs).

Customer Support
Cat dealer services help you operate longer with lower costs.

Customer Support

Product Support
You will find nearly all parts at our dealer parts counter. Cat dealers use a world-wide computer network to find in-stock parts to minimize machine down time. Save money with genuine Cat Reman parts. You receive the same warranty and reliability as new products at substantial cost savings.

Machine Selection
Make detailed comparisons of the machines under consideration before purchase. Cat dealers can estimate component life, preventive maintenance cost, and the true cost of lost production.

Look past initial price. Consider the financing options available as well as day-to-day operating costs. Look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run.

Customer Support Agreements
Cat dealers offer a variety of product support agreements, and work with customers to develop a plan that best meets specific needs. These plans can cover the entire machine, including attachments, to help protect the customer's investment.

Improving operating techniques can boost your profits. Your Cat dealer has videotapes, literature and other ideas to help you increase productivity, and Caterpillar offers certified operator training classes to help maximize the return on your machine investment.

Maintenance Services
Talk to your dealer about the range of available maintenance services. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as S·O·SSM Analysis and Coolant Sampling and Technical Analysis help avoid unscheduled repairs.

Repair, rebuild or replace? Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

Standard Equipment

  • Alarm, back-up
  • Alternator, 35 ampere, sealed
  • Batteries, maintenance free, 750 CCA
  • Electrical system, 24 volt
  • Lights, stop and tail
  • Motor, starting
  • Product Link connection
  • Accelerator
  • Ashtray and lighter
  • Coat hook
  • Control console, adjustable
  • Cup holder
  • EMS III operator warning system
  • Panel gauges inside cab
  • Hydraulic controls, load sensing
  • Meter, hour, digital
  • Mirror, inside rearview, wide angle
  • Mounting bracket, general purpose
  • Power steering, hydraulic
  • ROPS cab, sound suppressed, low profile
  • Seat, cloth, static
  • Seat belt, retractable 76 mm (3 in)
  • Steering wheel, tilt, adjustable
  • Storage area for cooler/lunchbox
  • Sunscreen, front windshield
  • Throttle control, electronic
  • Washer / wipers, (3) front windshields
  • Windows, fixed lower front
  • Air cleaner
  • Air to air after cooler (ATAAC)
  • Brakes - oil disc, four-wheel air actuated
  • Demand fan
  • Differential, lock-unlock
  • Engine, C-9 DITA ATAAC diesel
  • Fuel tank, sediment drain
  • Fuel-water separator
  • Lube for life pump drive shaft
  • Muffler, under hood
  • Parking brake - multi-disc, sealed and oil cooled
  • Pre-screener
  • Priming pump, fuel
  • Serpentine belt, automatic tensioner
  • Tandem drive
  • Transmission
  • Antifreeze -35°C (-30°F)
  • Bumper, rear, integrated, with hitch
  • Clutch, circle drive slip
  • Cutting edges
  • Doors, engine compartment, locking
  • Drawbar
  • Endbits - 16mm (5/8 in) DH-2 steel, mounting bolts
  • Engine shutdown, ground level
  • Frame, articulated with safety lock
  • Fuel tank, 100 gallon (378 L)
  • Fueling, ground level
  • Horn, air
  • Moldboard
  • Radiator cleanout access
  • S•O•SSM ports: engine, hydraulic, transmission, coolant, fuel
  • Tool box
  • Partial allowance: 13.00-24 10PR on 9" single piece rims

Optional Equipment

Accumulators, blade lift - 71 kg (156 lb)
Air conditioner with heater and pressurizer - 49 kg (107 lb)
Air dryer - 13 kg (29 lb)
Alternator, 75 ampere 7 kg (15 lb)
Batteries, extreme duty, 1300 CCA - 58 kg (128 lb)
Autoshift, transmission - 2 kg (5 lb)
Batteries, heavy duty, 1100 CCA - 42 kg (93 lb)
Blade, 3658 mm x 688 mm x 25 mm (12' ft x 27 in x 1 in) - 151 kg (340 lb)
Blade, 3962 mm x 686 mm x 25 mm (13 ft x 27 in x 1 in)- 208 kg (460 lb)
Blade, 4267 mm x 688 mm x 25 mm (14 ft x 27 in x 1 in) - 261 kg (574 lb)
Blade, 4267 mm x 610 mm x 22 mm (14 ft x 24 in x 7/8 in)- 75 kg (166 lb)
Blade, front-mounted 2750 mm x 980 mm (9 ft x 39 in) - 850 kg (1874 lb)
Blade, front dozer 1180 kg (2602 lb)
Blade, front, narrow 1100 kg (2425 lb)
Blade, front, with foldable ends 1525 kg (3362 lb)
Canopy, ROPS, high profile, with rear wall and window - -41 kg (-90 lb)
Cab, ROPS, high profile, sound suppressed - 77 kg (170 lb)
Converter, 25-amp, 24-V to 12-V - 5 kg (11 lb)
Covers, louver with screen 7 kg (15 lb)
Covers, lower rear frame 11 kg (25 lb)
Covers, metallic, fuel tank 11 kg (25 lb)
Cutting edges for 22 mm (7/8 in) thick blade
  • 203 mm x 19 mm (8 in x 3/4 in) for 3.7 m blade
  • 203 mm x 19 mm (8 in x 3/4 in) for 4.1 m blade
  • 203 mm x 16 mm (8 in x 5/8 in) for 3.7 m blade
  • 203 mm x 16 mm (8 in x 5/8 in) for 4.1m blade
Cutting edges for 25 mm (1 in) thick blade
  • 203 mm x 19 mm (8 in x 3/4 in) for 3.7 m blade
  • 203 mm x 19 mm (8 in x 3/4 in) for 4.1 m blade
Endbits, overlay, reversible - 11 kg (24 lb)
Engine, VHP or VHP Plus - 4 kg (10 lb)
Ether starting aid - 1 kg (2 lb)
Extensions, blade 610 mm (2 ft) right and left
  • for 22 mm (7/8 in) thick blade - 114 kg (250 lb)
  • for 25 mm (1 in) thick blade - 148 kg (325 lb)
Fan, defroster, front and rear - 2 kg (4 lb)
Graderbit system, penetration bit type - 163 kg (360 lb)
Guard, brake lines - 8 kg (18 lb)
Guard, lower platform - 23 kg (50 lb)
Guard, transmission - 98 kg (215 lb)
Hammer, with mounting - 5 kg (12 lb)
Heater, engine coolant - 1 kg (3 lb)
Heater, cab - 14 kg (30 lb)
Heater, cab, with pressurizer - 18 kg (40 lb)
Hydraulic arrangements with one or more additional hydraulic valves are available for front scarifier, rear ripper-scarifier, dozer, dozer angle, snow plow and snow wing. See dealer price list.
Hydraulic lockout - 2 kg (5 lb)
Lighting systems:
  • bar mounted, directional and headlights - 13 kg (28 lb)
  • cab mounted, directional and headlights - 9 kg (20 lb)
  • cab and bar mounted, directional, headlights and work lights - 22 kg (48 lb)
  • cab and bar mounted, high, directional, headlights and work lights - 22 kg (48 lb)
  • work lights, front and rear - 6 kg (13 lb)
  • snow wing light, right - 18 kg (40 lb)
  • warning light, cab or canopy mounted - 3 kg (6 lb)
Mirrors, dual, inside mounted - -
Mirrors, outside mounted - 8 kg (18 lb)
Mirrors, outside mounted, heated - 11 kg (25 lb)
Mount, snow wing, frame-ready - 91 kg (200 lb)
Power port, 12-V - 2 kg (5 lb)
Precleaner, turbine-type - -
Push plate, front mounted - 919 kg (2025 lb)
Radio ready, entertainment
Receptacle, starting, plug-in - 2 kg (5 lb)
Rims, tires - refer to dealer price list
Ripper-scarifier, rear - 961 kg (2119 lb)
Ripper-scarifier/tooth, one - 33 kg (72 lb)
Rear scarifier, shanks/teeth, nine - 65 kg (144 lb)
Scarifier, front mounted, V-type - 845 kg (1862 lb)
Scarifier, front mounted, straight - 903 kg (1988 lb)
Seat, cloth-covered, contour air suspension
Seat, vinyl-covered, contour suspension
Snow arrangements, refer to Snow Arrangement Supplement
Sound suppression - 91 kg (200 lb)
Speedometer/tachometer - 1 kg (2 lb)
Steering, secondary - 50 kg (111 lb)
Sunshade, rear window - 3 kg (7 lb)
Windows, lower front, opening - 3 kg (6 lb)
Windows, sliding side - 4 kg (8 lb)
Wiper and washer, rear, intermittent - 7 kg (16 lb)
Wiper and washer, front, intermittent
European roading group which provides an additional air tank, air circuit protection valve and two position lights with integral turn signals. Dealer supplied equipment is required to meet some specific country on-road requirements - 23 kg (52 lb)



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