Used Caterpillar 120K Grader

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Detailed Introduction to CATERPILLAR 120K Bulldozer

The Caterpillar 120K is a classic medium-sized crawler bulldozer under Caterpillar’s K-series product line, designed to balance high operation efficiency, fuel economy, and extreme durability. It is widely favored in medium-to-heavy construction, mining, land management and other scenarios for its flexible maneuverability and strong load-handling capacity.

1. Core Specifications (Standard Configuration)

Parameter	Specific Value
Net Power (ISO 9249 standard)	138 kW / 185 hp at 2000 rpm
Operating Weight	19,800 kg (43,650 lb), up to 21,200 kg (46,740 lb) with U-blade and ripper attached
Blade Capacity	Straight (S) blade: 3.8 m³ (5.0 yd³); Semi-U blade: 4.9 m³ (6.4 yd³); Full U blade: 6.2 m³ (8.1 yd³)
Maximum Drawbar Pull	189 kN (42,500 lbf)
Ground Pressure	52 kPa (7.5 psi) with standard track shoes; 38 kPa (5.5 psi) with wide low-ground-pressure shoes
Travel Speed	Forward: 3.6–10.8 km/h (2.2–6.7 mph); Reverse: 4.4–12.6 km/h (2.7–7.8 mph)
Emission Standard	Meets EPA Tier 3 / EU Stage IIIA requirements

2. Core Performance Advantages

2.1 Power Train System

The 120K is equipped with a Caterpillar C7 ACERT 6-cylinder turbocharged aftercooled diesel engine, which optimizes fuel combustion efficiency through proprietary ACERT technology, reducing fuel consumption by 8-12% compared to older generation models of the same power class. It is also fitted with a dual-stage fuel filtration system that adapts to low-quality fuel in remote construction sites, with an engine overhaul interval of up to 12,000 operating hours. The on-demand variable speed cooling fan reduces unnecessary power loss and operating noise.

2.2 Undercarriage & Structural Design

It adopts Caterpillar’s heavy-duty welded track frame, which has strong impact resistance to cope with rugged and rocky working conditions. The optional Caterpillar SystemOne sealed and lubricated undercarriage extends track service life by more than 50% compared to ordinary undercarriages, greatly reducing daily maintenance costs. The equalizer bar design ensures maximum track contact with the ground on uneven terrain, maintaining stable traction and avoiding slippage.

2.3 Operation Comfort

The cab is certified with ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure). The sealed pressurized design isolates external dust and noise, with internal noise as low as 75 dB(A). It is equipped with a multi-directionally adjustable air suspension seat, and the ergonomic joysticks integrated on the armrests control travel and working devices separately, reducing operator fatigue during long-hour operations. The LCD digital dashboard displays real-time data such as fuel consumption, oil temperature, and fault codes, and a rearview camera is optional to eliminate blind spots.

3. Safety Configurations

Emergency stop button located at multiple accessible positions for fast power cut-off in case of abnormality
Standard reverse buzzer and travel alarm to remind surrounding personnel
Pressure relief valves installed in the high-pressure hydraulic system to avoid overload damage
Full LED lighting system covering front, rear and side working areas for safe night operation
Anti-slip walkways and handrails on both sides of the body to ensure safety during daily inspection and maintenance

4. Common Application Scenarios

Subgrade leveling, site clearing and earthwork transfer for highway, railway and municipal infrastructure projects
Waste dumping and site arrangement in open-pit mines
Forest land clearing, stump removal and farming land consolidation
Dam construction and river dredging in water conservancy projects
Post-disaster debris cleaning and demolition waste transfer in urban renewal projects

5. Optional Attachments

Multiple blade types: angle blade (adjustable left and right angle for side discharging), waste handling blade, snow plow
Ripper: single-tooth or 3-tooth ripper for breaking frozen soil, weathered rock and hard clay
Auxiliary devices: 10-ton winch for rescue and dragging operations, snow blower
Intelligent system: Caterpillar AccuGrade GPS grade control system, which realizes automatic leveling operation, improves construction accuracy by 30% and reduces rework rate
Caterpillar Product Link remote monitoring system, which tracks equipment location, operating status and fault warnings in real time, improving equipment utilization rate.

6. Maintenance Advantage

The 120K adopts a modular design, and all daily maintenance points are accessible from the ground, no need to climb to the top of the body for inspection. The engine oil replacement interval is 500 operating hours, and the hydraulic oil replacement interval is 2000 operating hours. Supported by Caterpillar's global after-sales service network, genuine spare parts are supplied efficiently, and the overall life cycle operating cost is 15% lower than similar products of other brands.

Non flooded

No accident

Original product

Used Caterpillar 120K Grader

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