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M Series Motor Graders(Non Current)

Cat motor graders continue their reputation for offering world-class cab and controls, advanced electronics and hydraulics, and optimum productivity... to match your needs in any application.

120H Motor Grader

The 120H blends productivity and durability to give you the best return on your investment. The Cat® 3126B engine, direct-drive power shift transmission and load-sensing hydraulics are perfectly balanced, working together to deliver top productivity in all applications.

  • Specification Summary

  • Base Power (1st Gear) - Net 93 kW
  • Engine Model Cat® 3126B DITA ATAAC VHP
  • VHP - Gears 4-8, Net 104 kW
  • Base Power (All Gears) - Gross 104 kW

Product Details


Base Power (1st Gear) - Net 93 kW
Engine Model Cat® 3126B DITA ATAAC VHP
VHP - Gears 4-8, Net 104 kW
Base Power (All Gears) - Gross 104 kW
VHP - Gears 1-3, Gross 104 kW
VHP - Gears 4-8, Gross 115 kW
Bore 110 mm
Stroke 127 mm
Speed at Rated Power 2000 RPM
Torque Rise 50%
Maximum Torque 737 N·m
Base Power (All Gears) - Net 93 kW
Displacement 7.2 l
VHP - Gears 1-3, Net 93 kW
Number of Cylinders 6
Derating Altitude 3048 m
Standard - Fan Speed - Maximum 1210 RPM
Standard - Fan Speed - Minimum 500 RPM
Standard - Ambient Capability 47 °C
High Ambient - Fan Speed - Maximum 1300 RPM
High Ambient - Fan Speed - Minimum 500 RPM
High - Ambient Capability 50 °C

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 16744 cm²
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 144 l/min
Maximum System Pressure 24150 kPa
Reservoir Tank Capacity 38 l
Standby Pressure 3100 kPa

Operating Specifications

Top Speed - Forward 42.6 km/h
Top Speed - Reverse 33.7 km/h
Turning Radius - Outside Front Tires 7.3 m
Steering Range - Left/Right 50°
Articulation Angle - Left/Right 20°
Forward - 1st 3.6 km/h
Forward - 2nd 5 km/h
Forward - 3rd 7.2 km/h
Forward - 4th 9.9 km/h
Forward - 5th 15.7 km/h
Forward - 6th 21.3 km/h
Forward - 7th 29.3 km/h
Forward - 8th 42.6 km/h
Reverse - 1st 2.9 km/h
Reverse - 2nd 5.4 km/h
Reverse - 3rd 7.8 km/h
Reverse - 4th 12.4 km/h
Reverse - 5th 23.1 km/h
Reverse - 6th 33.7 km/h

Service Refill

Fuel Capacity 340 l
Cooling System 40 l
Hydraulic System - Total 68 l
Hydraulic System - Tank 38 l
Engine Oil 29.5 l
Transmission - Differential - Final Drives 47 l
Tandem Housing - Each 49 l
Front Wheel Spindle Bearing Housing 0.5 l
Circle Drive Housing 7 l


Circle - Diameter 1530 mm
Circle - Blade Beam Thickness 30 mm
Drawbar - Height 127 mm
Front-Top/Bottom Plate - Width 280 mm
Front-Top/Bottom Plate - Thickness 22 mm
Front-Side Plates - Width 236 mm
Front-Side Plates - Thickness 10 mm
Front-Linear Weights - Minimum 134 kg/m
Front-Linear Weights - Maximum 172 kg/m
Front-Section Modulus - Minimum 1619 cm³
Front-Section Modulus - Maximum 3681 cm³
Front Axle - Height to Center 608 mm
Front Axle - Wheel Lean - Left/Right 18°
Front Axle - Total Oscillation per Side 32°


Height 438 mm
Width 172 mm
Sidewall Thickness - Inner 14 mm
Sidewall Thickness - Outer 16 mm
Drive Chain Pitch 44.5 mm
Wheel Axle Spacing 1510 mm
Tandem Oscillation - Front Up 15°
Tandem Oscillation - Front Down 25°


Blade Width 3.658 m
Moldboard - Height 610 mm
Moldboard - Thickness 22 mm
Arc Radius 413 mm
Throat Clearance 120 mm
Cutting Edge Width 152 mm
Cutting Edge Thickness 16 mm
End Bit - Width 152 mm
End Bit - Thickness 16 mm
Blade Pull - Base GVW 8081 kg
Blade Pull - Maximum GVW 10661 kg
Blade Down Pressure - Base GVW 6574 kg
Blade Down Pressure - Maximum GVW 9100 kg

Blade Range

Circle Centershift - Right 628 mm
Circle Centershift - Left 625 mm
Moldboard Sideshift - Right 660 mm
Moldboard Sideshift - Left 524 mm
Maximum Blade Position Angle 90°
Blade Tip Range - Forward 40°
Blade Tip Range - Backward
Maximum Shoulder Reach Outside of Tires - Right 1912 mm
Maximum Shoulder Reach Outside of Tires - Left 1840 mm
Maximum Lift Above Ground 457 mm
Maximum Depth of Cut 775 mm


Ripping Depth - Maximum 262 mm
Ripper Shank Holders 5
Shank Holder Spacing - Minimum 533 mm
Penetration Force 4343 kg
Pry-Out Force 2279 kg
Machine Length Increase, Beam Raised 1058 mm


Front, V-Type - Scarifier Shank Holders 11
Front, V-Type - Scarifier Shank Holder Spacing 116 mm
Front, V-Type - Working Width 1184 mm
Front, V-Type - Scarifying Depth, Maximum 292 mm
Front, Straight - Working Width 1800 mm
Front, Straight - Scarfying Depth, Maximum 317 mm
Front, Straight - Scarifier Shank Holders 17
Front, Straight - Scarifier Shank Holder Spacing 111 mm


Gross Vehicle Weight - Maximum - Front Axle 5076 kg
Gross Vehicle Weight - Maximum - Rear Axle 11846 kg
Gross Vehicle Weight - Base - Front Axle 3611 kg
Gross Vehicle Weight - Base - Rear Axle 9039 kg
Gross Vehicle Weight - Maximum - Total 16922 kg
Gross Vehicle Weight - Base - Total 12650 kg


Height - Top of Cab 3108 mm
Height - High Profile Cab 3332 mm
Height - No Cab 3090 mm
Length - Counterweight to Ripper 10064 mm
Width - Outside Front Tires 2441 mm
Length - Front Axle to Mid Tandem 5923 mm
Length - Front Tire to Rear of Machine 8314 mm
Length - Front Axle to Moldboard 2596 mm
Length - Between Tandem Axles 1510 mm
Width - Outside Rear Tires 2402 mm
Width - Tire Center Lines 2056 mm
Height - Front Axle Center 594 mm
Height - Exhaust Stack 3138 mm
Height - Top of Cylinders 2912 mm
Ground Clearance - Rear Axle 351 mm


Caterpillar engines deliver increased performance and lower operating costs.

3126B DITA ATAAC Engine

The innovative Cat 3126B diesel engine delivers large-engine performance from a compact engine design. The six-cylinder engine is turbocharged and air-to-air aftercooled. With high displacement and low rated speed, this engine provides excellent fuel economy and durability that can significantly reduce operating costs.

Power Train

Matched Caterpillar components deliver smooth, responsive performance and reliability.

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 on any surface.


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, and intelligent 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 travelling 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 four 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.

Blade Lift Accumulators

These 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 120H 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 handle the loads possible with the new 3126B 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.

Operator's Station

The 120H includes innovative changes to improve operator efficiency and, in turn, greater machine productivity.

Comfort and Convenience

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

Exceptional Visibility

The narrow operator's console provides good forward visibility. Large side windows allow a clear view of the moldboard heel and tandem tires. A wide rear window and tapered engine hood provide a good view to the rear of the machine. The position of the air dryer and air cleaner, and the alignment the precleaner and muffler, provides good visibility to the rear of the machine. Operators can work more confidently and efficiently.


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

Service Center

Gathering many of the frequently serviced items into a ‘Service Center’ on the left side greatly improves access, and helps ensure proper maintenance and inspection routines, The result is 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
  • Spin-on filters for oils, fuel, coolant
  • Remote lubrication points, purge valves and ecology drain lines
  • Fuse panel with new automotive style fuses located inside cab
  • Sample ports for engine, hydraulic, transmission fluids, coolant and fuel, encourages preventive maintenance and diagnostics like the S•O•SSM analysis program.

Fuel Tank

A 340 L (90 gal) ground level fuel tank allows longer work shifts and reduces refueling times. A fuel tank sediment drain enables the operator to remove sediment accumulation, reducing the risk of fuel system damage.

Extended Fluid Change Interval

Operate a full 500 hours between engine oil and filter changes, 4,000 hours between hydraulic oil changes, and 12,000 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, and intelligent 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.

Environmentally Responsible Design

Caterpillar builds machines that help you create a better world.

Quiet Cab

The resiliently mounted engine and transmission provide interior sound levels of 76dB(A) when measured with the doors and windows closed per ISO 6394. Lower interior noise levels improve operator working conditions.

Quiet Machine

Exterior sound level of 107dB(A) when tested per ISO 6395, Annex B. The optional sound suppression group complies with the EU 2000/14/EC sound limit of 107 dB(A). This quiet operation lets the 120H work with minimal disturbance to the surroundings.

Low Emissions

The 120H 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 II and EU Stage II emissions control standards worldwide.

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 chloroflourocarbons (CFCs).

Customer Support

Cat dealer services help you operate longer with lower costs.

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.
    •  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 the 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, covered adjustable
    •  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 with dry type radial seal, service indicator, sutomatic dust ejector
    •  Air to air after cooler (ATAAC)
    •  Brakes - oil disc, four-wheel air actuated
    •  Demand fan
    •  Differential, lock-unlock
    •  Engine, 3126 DITA diesel with VHP, automatic derate, automatic idle control
    •  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 - 4 shoe, replaceable wear strips
    •  Endbits - 16mm (5/8 in) DH-2 steel, 16mm (5/8 in) mounting bolts
    •  Frame, articulated with safety lock
    •  Fuel tank, 90 gallon (340 L)
    •  Fueling, ground level
    •  Ground level engine shutdown
    •  Horn, air
    •  Link bar, 7 position
    •  Moldboard
    •  Radiator cleanout access
    •  SOS ports: engine, hydraulic, transmission, coolant, fuel
    •  Tool box
    •  Partial allowance: 13.00-24 10PR on 9" single piece rims
  • Partial allowance: 13.00-24 10PR on 9" single piece rims
    • 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 6 kg (15 lb)
            • Batteries, heavy duty, 1100 CCA - 44 kg (96 lb)
              • Blade, 3962 mm x 688 mm x 25 mm (13' ft x 27 in x 1 in) - 209 kg (460 lb)
                • Blade, 4267 mm x 610 mm x 22 mm (14 ft x 24 in x 7/8 in)- 75 kg (166 lb)
                  • Blade, 4267 mm x 688 mm x 25 mm (14 ft x 27 in x 1 in) - 261 kg (574 lb)
                    • Blade, front-mounted 2750 mm x 980 mm (9 ft x 39 in) - 850 kg (1874 lb)
                      • Blade, front - 1180 kg (2602 lb)
                        • Blade, front, narrow - 1100 kg (2425 lb)
                          • Blade, front with foldable ends - 1525 kg (3362 lb)
                            • Cab, ROPS, high profile, sound suppressed - 77 kg (170 lb)
                              • Canopy, ROPS, high profile, with rear wall and window - -41 kg (-90 lb)
                                • Converter, 25 ampere, 24V to 12V - 5 kg (11 lb)
                                  • Covers, metallic, fuel tank 11 25
                                    • 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
                                    • 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 - 4 kg (10 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)
                                                • 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, 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)
                                                                              • Power port, 12-V - 2 kg (5 lb)
                                                                                • Push plate, counterweight - 919 kg (2025 lb)
                                                                                  • Precleaner, turbine-type 2 kg (5 lb)
                                                                                    • Radio ready, entertainment
                                                                                      • Receptacle, starting, plug-in - 2 kg (5 lb)
                                                                                        • Rims, tires - refer to dealer price list
                                                                                          • Ripper, rear - 612 kg ( 1350 lb)
                                                                                            • Ripper-scarifier/tooth, one - 12 kg ( 26 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
                                                                                                      • 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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