Used Caterpillar 320CL Excavator

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Caterpillar 320CL Hydraulic Crawler Excavator Detailed Introduction

The Caterpillar 320CL is an iconic 20-ton class hydraulic crawler excavator manufactured by Caterpillar Inc., the global leader in heavy construction equipment. Launched in the early 2000s as the successor to the widely recognized 320B L model, it is universally acknowledged as a benchmark in its class, favored by construction contractors, mining operators, and rental fleets worldwide for its balanced performance, extreme reliability, and low total cost of ownership.

1. Core Engine Performance

The 320CL is equipped with Caterpillar’s proprietary 3066T turbocharged direct-injection 6-cylinder diesel engine, compliant with EU Stage II / U.S. EPA Tier 2 emission standards:

Net power output: 103 kW (138 hp) at 2000 rpm, with optimized low-end torque to support heavy-duty digging, lifting, and grading operations
Built-in automatic idle speed control system cuts fuel consumption by reducing engine rpm during non-operating idle periods, lowering operating costs and noise emissions
High durability design enables stable operation in extreme temperature environments from -20°C to 45°C, with optional cold-start kits for alpine regions

2. Advanced Hydraulic System

The model adopts Caterpillar’s field-proven load-sensing hydraulic system with pressure compensation, delivering precise, responsive control and excellent multi-function coordination:

Dual axial piston main pumps provide a total maximum flow rate of 240 L/min, with a system working pressure of 35 MPa, ensuring strong breakout force for tough rock and soil digging conditions
Pre-programmed dedicated lift mode optimizes hydraulic pressure and flow for heavy lifting tasks, reducing swing drift and improving operational safety
Cushioning valves installed in the boom, arm, and swing circuits reduce mechanical shock, extend component service life, and improve operation smoothness

3. Key Operating Specifications

Parameter	Standard Configuration Value
Operating Weight	20,500 – 22,000 kg (varies by boom, arm, bucket and track shoe configuration)
Standard Bucket Capacity	0.8 – 1.2 m³
Maximum Digging Depth (5.7m boom + 2.9m stick)	6,720 mm
Maximum Digging Reach	9,850 mm
Maximum Dumping Height	6,510 mm
Boom Breakout Force	114 kN
Stick Breakout Force	141 kN
Max Travel Speed	5.5 km/h
Swing Speed	11.5 rpm
Gradeability	35° (70% slope)

4. Structural Design & Durability

The 320CL is built for long service life in harsh working environments:

The undercarriage adopts a full-box-section X-frame design, with high structural rigidity and excellent torsion resistance, capable of withstanding impact loads from rough terrain, mining sites, and demolition works
The boom and stick are manufactured with high-tensile strength steel plates, robotically welded and stress-relieved to avoid cracking under long-term heavy loads
The Sealed and Lubricated Track (SALT) system reduces internal wear of track pins and bushings, extending undercarriage service life by up to 30% compared to non-sealed tracks, and lowering travel noise
Heavy-duty large-diameter slew bearing ensures stable load bearing during high-load swing and lifting operations

5. Operator Comfort & Safety

The 320CL’s Caterpillar Comfort Cab is designed to reduce fatigue and improve operational safety:

The cab meets ISO ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) standards, ensuring operator safety in high-risk worksites
Fully sealed and pressurized cab with sound insulation material keeps internal noise level below 76 dB(A), and blocks dust and fumes from entering
Air-suspension multi-adjustable seat with lumbar support fits operators of different heights, reducing fatigue during long shifts
Low-effort pilot hydraulic joysticks are ergonomically placed to minimize wrist and arm strain
Multi-function LCD monitor displays real-time operating data including engine rpm, fuel level, hydraulic oil temperature, and active fault alerts
High-capacity heating and air conditioning system with multiple air vents ensures comfortable working temperatures in extreme cold or hot environments

6. Service & Maintenance Accessibility

Caterpillar designed the 320CL to minimize maintenance time and cost:

All daily and routine maintenance points are accessible at ground level, with centralized filter locations (engine oil filter, fuel filters, air filter, hydraulic oil return filter) on the right side of the upper frame, reducing service time
Extended service intervals: engine oil and filter change every 500 operating hours, hydraulic oil and filter change every 2000 hours (when using Caterpillar approved hydraulic oil), reducing downtime
Remote diagnostic ports allow service technicians to quickly read fault codes and perform troubleshooting
Centralized lubrication points for the boom, arm, and swing mechanism make regular greasing faster and more comprehensive

7. Typical Applications

Thanks to its balanced performance and versatile design, the 320CL adapts to a wide range of worksites:

General construction: foundation digging, trenching, backfilling
Road and bridge construction: roadbed excavation, material handling, slope grading
Mining and quarrying: overburden stripping, ore loading, site cleanup
Demolition works (with optional reinforced boom/arm): compatible with hydraulic breakers, hydraulic shears for small to medium demolition tasks
Water conservancy projects: river dredging, dam construction
It supports a wide range of optional work tools including grapples, augers, rippers, and pile drivers to expand its application range.

Market Reputation

Decades after its launch, the Cat 320CL remains one of the most sought-after excavator models in the global second-hand heavy equipment market, thanks to its extremely high reliability, wide availability of spare parts, low long-term operating cost, and high resale value.

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Used Caterpillar 320CL Excavator

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