K Series Motor Graders Caterpillar 120K
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.
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.
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.
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.
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
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.
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 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.
|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|
|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|
|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|
|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|
|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|
|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|
|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 °|
|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|