K Series Motor Graders Caterpillar 120K

The 120K optimizes your investment by delivering maximum productivity and durability. The Cat C7 engine, direct-drive power shift transmission and load-sensing hydraulics work together to ensure the power and precision to get the job done.

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Balanced Flow, Independent Oil Supply

Hydraulic flow is proportioned to ensure all implements operate simultaneously. Independent oil supply prevents cross-contamination and provides proper oil cooling, which means less heat build-up and extended component life.

Implement Control Valves

Provide outstanding operator "feel" and predictable system response for unmatched implement control. To help maintain exact blade settings, lock valves are built into all control valves. Line relief valves are also incorporated into selected control valves to protect the cylinders from over-pressurization.

Load-Sensing Hydraulics (PPPC)

A load sensing variable displacement pump and the advanced Proportional Priority Pressure-Compensating (PPPC, or "triple-PC") hydraulic valves provide superior implement control and better machine performance. PPPC valves have different flow rates for the head and rod ends of the cylinder. Continuously matching hydraulic flow and pressure to power demands creates less heat and reduces power consumption.

Consistent and Predictable Movement

The hydraulic system uses valves that provide PPPC control for precise implement and machine operation. These valves contain spools that are specifically cut for each hydraulic function on the motor grader. They compensate for differences in flow requirements, based on cylinder size and the difference in surface volume between the rod end (blue) and barrel end (red) of the cylinder. The result is predictable, consistent hydraulic speeds whether extending or retracting the cylinder.


ROPS/FOPS Cab offers Low Sound and Vibration Levels

The operator sound pressure level for the cab offered by Caterpillar, when properly installed, maintained and tested with the doors closed, meets or exceeds requirements set forth in ISO 6394:1998. The quiet environment improves operator working conditions. Steel non-skid steps use raised perforations to provide sturdy access to the tandems.

Brake Systems and Machine Protection

Brakes located at each tandem wheel offer the largest total brake surface area in the industry, delivering dependable stopping power and longer brake life. Standard circle drive slip clutch protects the drawbar, circle and moldboard from shock loads when the blade encounters an immovable object. Blade lift accumulators help absorb impact loads to the moldboard by allowing vertical blade travel.

Electrical Disconnect Switch and Engine Shutoff Switch

Disconnect switch provides ground-level lockout of the electrical system to prevent inadvertent machine starts. Engine shutoff allows anyone nearby to shut the machine down in case of an emergency.

Additional Safety Features

Laminated glass on the front windows and lockable doors to reduce theft and vandalism are available with the optional cab. Brake lights, conveniently located grab rails, back up lights and alarm also help ensure a safe work environment.


Grouped Service Points on the left side to help ensure proper maintenance

Easy access to service areas speeds up maintenance and ensures that routine service is performed on time. Ecology drains shorten service times and help prevent spills. Radiator cleanout access gives the operator the ability to clear away debris and other materials that build up around the radiator. Fuel water separator is easily accessible from the ground.

Extended Service Intervals Reduce Downtime, Operating Cost

  • 500 hour engine oil changes
  • 4,000 hour hydraulic oil changes
  • 12,000 hour engine coolant changes

Diagnostics and Machine Monitoring via Electronic Technician

The dash cluster panel provides enhanced machine information and diagnostic capability, which allows faster servicing of the transmission and engine. Cat ET is a two-way communication tool that gives service technicians easy access to stored diagnostic data and lets them configure the machine parameters through the Cat Data Link.

O-Ring Face Seals

O-Ring face seals create a reliable connection and are used in all hydraulic circuits to minimize the possibility of oil leaks.

Separate Wiring Harnesses

This modular harness design provides simple disconnects for major machine repairs or rebuilds.

Electronic Solutions

AccuGrade™ Grade Control System

The Cat AccuGrade System automatically controls the blade, improving operator efficiency and productivity. AccuGrade technology reduces the need for traditional survey stakes or grade checkers, so you can reach grade faster and in fewer passes than ever before. The Cat AccuGrade System includes Cross Slope, Sonic, Laser, GPS or ATS electronic kits that are available in the AccuGrade price list. The factory installed AccuGrade Attachment Ready Option provides additional mounting brackets, cab controls and electrical harnesses for easy installation of the AccuGrade Systems.

Product Link

Streamlines diagnostic efforts, and reduces downtime, maintenance scheduling and costs by providing a communication flow of vital machine data and location. Product Link gives automatic updates on machine parameters such as machine hours, machine condition, location, fault codes and alarms directly to your office computer.

Cat ET (Electronic Technician)

Cat ET is a two-way communication tool that gives service technicians easy access to stored diagnostic data, reducing machine downtime and lowering operating costs.

Structures, DCM

Frame Structure - Provides Consistency and Strength

Front frame is a continuous top and bottom plate construction. Flanged box section design removes welds from high stress areas, improving reliability and durability. The rear frame structure has two box section channels with fully welded differential case for a solid working platform. An integrated bumper ties the rear frame together into a cohesive unit to handle high stress loads.

Drawbar, Circle and Moldboard (DCM)

The Y-frame drawbar is constructed of two solid beams for strength, durability, and precise blading control. This design allows the addition of a mid-mount scarifier without compromising blade positioning in extreme reach positions. The circle stands up to high stress loads. Raised wear surfaces prevent circle teeth wear against the drawbar. The 64 uniformly spaced circle teeth are flame cut and heat induction hardened to resist wear, and the circle is secured to the drawbar by four support shoes for maximum support. The moldboard provides optimal curvature and large throat clearance that helps move all soil types quickly and efficiently. These features deliver excellent load distribution and minimal material buildup in the circle area while allowing large blade loads to roll freely.

Blade Lift Accumulators

This optional feature uses accumulators to help absorb impact loads to the moldboard by allowing vertical blade travel. Blade lift accumulators reduce unnecessary wear and help to avoid unintended machine movement for increased operator safety.

Operator's Station

Designed to keep operators comfortable, relaxed and productive throughout the long work shift.

The 120K features:

  • Electronic Clutch Pressure Control (ECPC) optimizes inching modulation and smoothes shifting
  • Low efforts on all pedals, hydraulic controls and the transmission shifter
  • Rocker switches and transmission shifter are backlit for night time operation
  • The operator can adjust implement controls and steering wheel angle independently
  • Clear view to the moldboard heel and tandem tires
  • Fresh air filters above each cab door for quick replacement

In-dash Instrument Cluster

The instrument panel, with easy-to read, high-visibility gauges and warning lamps, keeps the operator aware of critical system information. The dash cluster panel provides enhanced machine information and diagnostic capability. It includes an engine coolant temperature gauge, an articulation gauge, voltage gauge, and fuel level gauge. Service brake air pressure gauges are also standard. Speedometer and tachometer are optional. All major systems are monitored by warning lights.

Additional Cab Features

Additional cab features include storage area, an adjustable control console, and a coat hook. The following optional features are also available: power port, air conditioner/heater, suspension seat, defroster fan, sun shade, backup lights, Product Link ready, and AccuGrade™ System Ready. NOTE: Some attachments are not available in all regions

Work Tools and Attachments

Moldboard Options

Standard moldboard length is 3.7 m (12 ft), with an optional 4.3 m (14 ft) moldboard available from the factory. Left and right side moldboard extensions (available through the Cat parts system) will increase moldboard surface area and extend reach capability.

Ground Engaging Tools (GET)

A wide variety of Cat GET is available from Cat parts system, including cutting edges, and end bits, all designed for maximum service life and productivity.

Rear Ripper / Scarifier

The 120K optional ripper/scarifier is made to penetrate tough material fast and rip thoroughly for easier material movement with the moldboard. The ripper includes three shanks with the ability to add two more if needed. Nine scarifier shanks can also be added for additional versatility.

Front Mounted Groups

A front mounted push plate/ counterweight or front blade can be ordered.

Mid-Mount Scarifier

Positioned between the front axle and the circle to break up tough material that the blade can then move, all in a single pass. The V-type scarifier can accommodate up to 11 teeth.

Snow Removal Work Tools

Includes snow wings, angle blades, and V-plows. Multiple mounting options are available, increasing machine versatility. (Availability may differ by region.)

Power Train

Power Shift Transmission

Provides on-the-go, full-power shifting and inching capability. Direct drive delivers superior fuel efficiency and better "feel" of blade loads, material hardness and ground speed.

Optional Autoshift - Automatic Gear Shifts

This feature automatically shifts the transmission at optimal points (in gears 3-8) so the operator can focus on the work, improving safety, productivity and ease of operation.

Oil Disk Brakes - Completely Sealed, Adjustment Free

Oil-bathed, air actuated and spring-released, located at each tandem wheel to eliminate power train braking loads and to reduce servicing time. The large brake surface area provides dependable braking capability and extended life before rebuild.

Front Axle with Cat Live Spindle Design

Caterpillar sealed spindle keeps the bearings free from contaminants and lubricated in a lightweight oil to reduce owning and operating costs. Two tapered roller bearings support the wheel spindle. The larger tapered roller bearing is outboard where the load is greater, extending bearing life.

Specificatii tehnice


Base Power (1st Gear) - Net 93 kW
Engine Model Cat® C7 ACERT™
VHP - Gears 1-2, Net 93 kW
VHP - Gear 3, Net 101 kW
VHP - Gears 4-8, Net 108 kW
VHP - Gears 1-2, Gross 103 kW
VHP - Gear 3, Gross 110 kW
VHP - Gears 4-8, Gross 118 kW
Displacement 7.2 l
Bore 105 mm
Stroke 127 mm
Speed at Rated Power 2000 r/min
Number of Cylinders 6
Derating Altitude 3048 m
High Ambient - Fan Speed - Maximum 1350 r/min
High - Ambient Capability 50 °C
VHP Range - Net 93-108 kW (125-145 hp)
Base Power (All Gears) - Net 93 kW
Torque Rise 50 %
Maximum Torque 794 N·m
Power Train
Forward/Reverse Gears 8 fwd / 6 rev
Transmission Direct drive, Powershift
Brakes - Service Air actuated, multiple oil-disc
Brakes - Service - Surface Area 18606 cm²
Brakes - Parking Air actuated, multiple oil-disc
Brakes - Secondary Dual Circuit
Operating Specifications
Top Speed - Forward 45.7 km/h
Top Speed - Reverse 36.1 km/h
Turning Radius - Outside Front Tires 7.3 m
Steering Range - Left/Right 47.5 °
Articulation Angle - Left/Right 20 °
Forward - 1st 3.9 km/h
Forward - 2nd 5.3 km/h
Forward - 3rd 7.7 km/h
Forward - 4th 10.6 km/h
Forward - 5th 16.8 km/h
Forward - 6th 22.8 km/h
Forward - 7th 31.4 km/h
Forward - 8th 45.7 km/h
Reverse - 1st 3.1 km/h
Reverse - 2nd 5.8 km/h
Reverse - 3rd 8.4 km/h
Reverse - 4th 13.3 km/h
Reverse - 5th 24.8 km/h
Reverse - 6th 36.1 km/h
Hydraulic System
Circuit Type Load Sensing, Closed Center, PPPC
Pump Type Variable Piston
Pump Output 210.5 l/min
Maximum System Pressure 25500 kPa
Standby Pressure 3600 kPa
Reservoir Tank Capacity 24.5 l
Blade Width 3.7 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 - Typical GVW 8210 kg
Blade Pull - Maximum GVW 10572 kg
Down Pressure - Typical GVW 7018 kg
Down Pressure - Maximum GVW 9037 kg
Blade Range
Circle Centershift - Right 656 mm
Circle Centershift - Left 658 mm
Moldboard Sideshift - Right 663 mm
Moldboard Sideshift - Left 512 mm
Maximum Blade Position Angle 90 °
Blade Tip Range - Forward 40 °
Blade Tip Range - Backward 5 °
Maximum Shoulder Reach Outside of Tires - Right 1928 mm
Maximum Shoulder Reach Outside of Tires - Left 1764 mm
Maximum Lift Above Ground 410 mm
Maximum Digging Depth 775 mm
Ripping Depth - Maximum 262 mm
Ripper Shank Holders, Quantity 5
Ripper Shank Holder Spacing 533 mm
Penetration Force 4343 kg
Pry-Out Force 2279 kg
Machine Length Increase, Beam Raised 1058 mm
Mid, V-Type - Working Width 1184 mm
Mid, V-Type - Scarifying Depth, Maximum 229 mm
Mid, V-Type - Scarifier Shank Holders Quantity 11
Mid, V-Type - Scarifier Shank Holder Spacing 116 mm
Circle - Diameter 1530 mm
Circle - Blade Beam Thickness 30 mm
Drawbar - Height 127 mm
Drawbar - Width 76.2 mm
Front Axle - Height to Center 615 mm
Front Axle - Wheel Lean - Left/Right 18 °
Front Axle - Total Oscillation per Side 32 °
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 cm²
Front-Section Modulus - Maximum 3681 cm²
Height 438 mm
Width 172 mm
Sidewall Thickness - Inner 1 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 °
Service Refill
Fuel Capacity 305 l
Cooling System 40 l
Engine Oil 25 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
Gross Vehicle Weight - Typically Equipped 13032 kg
Gross Vehicle Weight - Base - Total 12035 kg
Gross Vehicle Weight - Typically Equipped - Total 13032 kg
Gross Vehicle Weight - Typically Equipped - Rear Axle 9122 kg
Gross Vehicle Weight - Typically Equipped - Front Axle 3910 kg
Gross Vehicle Weight - Base - Front Axle 3611 kg
Gross Vehicle Weight - Base - Rear Axle 8425 kg
Gross Vehicle Weight - Maximum 16781 kg
Gross Vehicle Weight - Maximum - Front Axle 5034 kg
Gross Vehicle Weight - Maximum - Rear Axle 11747 kg
Height - ROPS Cab 3326 mm
Height - Non-ROPS Cab 3320 mm
Height - ROPS/Canopy 3326 mm
Ground Clearance - Center Front Axle 602 mm
Length - Between Tandem Axles 1510 mm
Length - Front Axle to Moldboard 2600 mm
Length - Front Axle to Mid Tandem 5870 mm
Length - Front Tire to Rear of Machine 8242 mm
Length - Counterweight to Ripper 9769 mm
Ground Clearance - Trans. Case 341 mm
Height - Top of Cylinders 2885 mm
Height - Exhaust Stack 2865 mm
Width - Tire Center Lines 2056 mm
Width - Outside Rear Tires 2459 mm
Width - Outside Front Tires 2464 mm
ROPS/FOPS ISO 3471:1994/ISO 3449:1992
Steering ISO 5010:1992
Brakes ISO 3450:1996
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