Used Caterpillar 140K Grader

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It’s worth clarifying right at the start: the Caterpillar 140K is a motor grader, not a bulldozer (track-type tractor). The two machines serve very different purposes—graders are used for fine grading, shaping, and finishing, while bulldozers are for heavy earthmoving and pushing. That said, the 140K is one of the most popular mid-size motor graders ever built, and here is its detailed introduction in English.

Caterpillar 140K Motor Grader – Detailed Introduction

Overview

The Caterpillar 140K is a mid-range motor grader from Caterpillar’s K-Series, positioned between the smaller 120K and larger 160K. It succeeded the highly successful 140H and brought significant improvements in engine technology, operator comfort, controllability, and serviceability. The 140K is widely used in road construction and maintenance, site preparation, ditching, slope work, snow removal, and general earthmoving grading tasks.

Engine

Model: Cat C7 ACERT™ inline 6-cylinder diesel engine
Net Power (ISO 9249): 138 kW (185 hp) at 2,000 rpm
Note: power varies slightly by market and emission standard (Tier 3 / Stage IIIA equivalent)
Displacement: 7.2 litres
Aspiration: Turbocharged and aftercooled
Fuel System: Electronic high-pressure common rail
Emission Control: ACERT technology with advanced electronic control, meets EPA Tier 3 and EU Stage IIIA emission standards
Maximum Torque: Approximately 850 N·m (627 lb-ft) at 1,400 rpm
Torque Rise: Up to 39%, providing excellent lugging capability without downshifting under varying loads
Cooling: High-efficiency radiator with a hydraulically driven, variable-speed fan that reduces power draw and noise

The engine is tuned to deliver strong low-end torque and consistent performance in all grading applications, with a full-load fuel consumption that is highly competitive for its class.

Transmission & Drivetrain

Transmission Type: Cat direct-drive power shift with electronic control
Gears: 8 forward speeds / 6 reverse speeds
Shifting: Smooth, clutch-free powershifting under load using the transmission control lever; an automatic shift mode is also available
Top Speed (Forward): Approximately 45 km/h (28 mph)
Top Speed (Reverse): Approximately 35 km/h (22 mph)
Differential: Standard locking/unlocking differential in the rear tandem axle
Tandem Drive: Caterpillar’s proven tandem drive system with heavy-duty chains and gear reduction in each tandem wheel hub, ensuring excellent traction and long component life
NoSpin® Differential (optional): Automatically locks the rear axles together when wheel slip is detected, improving traction in poor underfoot conditions

The powershift transmission allows operators to change gears instantly while maintaining momentum, which is essential for productivity in grading operations.

Hydraulic System

Implement Hydraulic Pump: Variable-displacement piston pump with load-sensing capability
Pump Output (max flow): Up to 230 L/min (60.7 gal/min) at 2,200 psi (15,200 kPa) standard system pressure
Control Valves: Electro-hydraulic valve stack with low-effort fingertip controls
Blade Control Functions: Raise/lower (left and right sides independently), circle rotate, sideshift (left and right), blade tip (forward and backward), blade pitch adjustment
Optional Auxiliary Hydraulics: For front lift group, ripper, scarifier, snow wing, or other attachments
Hydraulic Filter: High-efficiency full-flow filtration with cold-start bypass and filter restriction indicator

The load-sensing hydraulic system provides flow only when demanded by the operator, reducing parasitic losses and heat generation. Precise metering makes it possible to achieve very fine grading control.

Moldboard (Blade)

Standard Moldboard Length: 3.66 m (12 ft)
Optional Moldboard Lengths: 4.27 m (14 ft) for higher capacity applications
Blade Height: 610 mm (24 in)
Blade Thickness: 22 mm (0.87 in), with hardened cutting edge and end bits
Blade Sideshift: Total sideshift capability of approximately 660 mm (26 in) right and left
Circle Diameter: 1,524 mm (60 in)
Circle Rotation: Full 360° continuous rotation with slip clutch protection
Blade Pitch Adjustment: Hydraulic blade tip with a range of 40° forward to 5° backward, allowing the operator to adjust the cutting angle for different materials
Maximum Blade Pull (calculated): Approximately 12,000 kg (26,455 lb) – sufficient for heavy blading work

The blade geometry and hydraulic response allow for aggressive cutting and precise finishing. The circle and drawbar design is engineered for high stress loads and long service intervals.

Front Axle & Articulation

Frame Articulation: 25° left and right, providing a tight turning radius and exceptional maneuverability
Front Axle Oscillation: ±15°, allowing the front wheels to follow uneven terrain while keeping the machine stable
Turning Radius (outside front tyres): Approximately 7.6 m (25 ft)
Lean Wheel System (optional): Front wheel lean up to 18° left or right, counteracting side draft and improving stability on slopes
Front Axle Lock/Unlock: The differential can be locked for maximum traction or unlocked for tight turns without scuffing

Operator Station

Cab Type: ROPS/FOPS certified enclosed cab with sound suppression
Visibility: Large curved front windshield, tinted safety glass, large side windows, and a standard rear-view camera (on later production years) or mirrors provide excellent all-round visibility to the blade and working area
Controls: Two low-effort joystick controllers (left for blade lift and circle rotation, right for sideshift and articulation/auxiliaries) with adjustable armrests; steering wheel with tilt and telescoping column
Instrumentation: Cat Messenger display system showing engine parameters, fuel consumption, service codes, and machine diagnostics; gauges for engine coolant, hydraulic oil temperature, and fuel level
Seat: Air-suspension high-back cloth seat with fore/aft and weight adjustment
HVAC: High-capacity air conditioning and heating system with pressurised cab and filtered air intake
Noise Level: Approximately 72 dB(A) inside the cab, well below operator fatigue thresholds
Storage: Multiple compartments for lunch box, documents, and personal items

The K-Series cab was a significant step forward in ergonomics and operator comfort, reducing fatigue during long shifts.

Structure & Undercarriage

Frame: Heavy-duty articulated box-section mainframe made of high-strength steel with welded and bolted connections at high-stress areas
Drawbar: A-frame drawbar with replaceable bushings and hardened pins, designed for continuous rotational and horizontal loads
Circle and Pinion: Robust ductile iron circle with hardened teeth and a bronze wear strip for smooth rotation; pinion gear is easily accessible for maintenance
Linkage: Blade lift cylinders, circle rotation motor, and sideshift cylinder are mounted in protected locations to reduce damage risk

Serviceability & Technology

Service Access: Large one-piece engine hood that tilts forward, ground-level access to daily service points (engine oil, coolant, air filter, sight gauges), grouped hydraulic filters and grease points
Ecology Drains: Standard on engine oil, hydraulic tank, coolant, and transmission for clean fluid change
AccuGrade™ Ready: The 140K is factory-prepared for Caterpillar’s AccuGrade laser, GPS, or total station grade control systems, with wiring harnesses and brackets installed
Cat Product Link™: Optional telematics system that remotely tracks location, hours, fuel consumption, and machine health
Long Service Intervals: Engine oil and filter change at 500 hours, hydraulic oil at 2,000 hours (with SOS sampling), and extended coolant life with ELC (Extended Life Coolant)

Typical Operating Specifications

Operating Weight (standard configuration): Approximately 15,900 – 16,500 kg (35,000 – 36,400 lb), depending on equipment
Maximum Operating Weight: Can exceed 18,000 kg (39,700 lb) with ripper, scarifier, and front lift group
Overall Length (with blade straight): Approximately 8.6 m (28 ft 3 in)
Wheelbase (between front axle and tandem centre): 6.2 m (20 ft 5 in)
Width over tyres: 2.5 m (8 ft 2 in)
Height to top of cab: 3.3 m (10 ft 10 in)
Ground Clearance (centre of machine): ~350 mm (13.8 in)
Fuel Tank Capacity: 340 litres (90 US gal)
Hydraulic System Fluid Capacity: 110 litres (29 US gal)

Common Attachments & Options

Rear-mounted ripper/scarifier (variable or fixed shank)
Front lift group (dozer blade or push plate)
Snow wing and snow plough
Mid-mount scarifier
Laser/GPS grade control (Trimble, Topcon, or Cat AccuGrade)
Automatic air greaser (Lincoln auto-lube system)
Additional lighting packages for night work
Engine block heater for cold-weather starting

Applications

The Caterpillar 140K is a versatile machine found on virtually every type of civil construction and maintenance project:

Road construction: Spreading and trimming base material to precise grade before paving
Road maintenance: Reshaping gravel and unpaved roads, removing corrugations, cutting ditches
Site development: Final grading for large commercial and residential building pads
Airport runways: Fine grading for flatness tolerances
Mining: Haul road maintenance to reduce tyre wear on trucks
Snow removal: With a front V-plough or wing, the 140K clears highways and city streets efficiently
Agriculture: Land levelling and contouring for irrigation

Summary

The Cat 140K motor grader stands out for its balance of power, weight, and controllability. It offers excellent fuel economy through the C7 ACERT engine and on-demand hydraulics, a comfortable and quiet cab, and the legendary durability expected from Caterpillar. While it has been superseded by the M Series (and later the Next Generation graders), the 140K remains a highly sought-after used machine due to its simplicity, reliability, and parts support worldwide.

Non flooded

No accident

Original product

Used Caterpillar 140K Grader

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