Used Caterpillar 320DL Excavator

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Caterpillar 320DL Hydraulic Excavator Detailed Introduction

The Caterpillar 320DL is a class-leading 20-ton class medium hydraulic excavator manufactured by Caterpillar Inc., the global leader in construction and mining equipment. Renowned for its exceptional durability, high operational efficiency, and low total cost of ownership, it is one of the best-selling models in Caterpillar's excavator lineup, widely favored by contractors across construction, mining, forestry, and municipal engineering sectors.

1. Engine & Power Performance

The 320DL is equipped with Caterpillar’s proprietary C6.4 ACERT 6-cylinder, turbocharged, air-to-air aftercooled diesel engine, which meets Tier 3/Stage IIIA emission standards while delivering stable and strong power output:

Net rated power: 103 kW (138 hp) at 2000 rpm
Max torque: 550 N·m at 1500 rpm, with 30% extra torque reserve for heavy-load operations such as hard rock excavation and dense soil lifting.
The dual-stage fuel filtration system effectively adapts to low-quality fuel in emerging markets, reducing downtime caused by fuel contamination.
The automatic idle and engine speed control system cuts fuel consumption by 8-10% compared to the previous 320C model under the same working conditions.

2. Hydraulic System

Caterpillar’s optimized load-sensing hydraulic system ensures precise control and high operational efficiency for the 320DL:

Total main pump flow: 420 L/min (2 x 210 L/min), maximum working pressure: 35 MPa, providing strong breakout force for digging operations.
The proportional pilot control system delivers extremely smooth operation, allowing operators to perform fine adjustments for precision tasks such as pipe laying and trenching with minimal effort.
Independent flow distribution technology guarantees synchronous and stable performance of compound actions (digging, swinging, boom lifting, arm extending at the same time), eliminating operation lag and improving work efficiency by 15% compared to similar competing models.
Buffer valves installed at key positions of the boom and arm cylinders reduce hydraulic shock during sudden stops or heavy load changes, extending the service life of hydraulic components by 20%.

3. Key Operating Specifications

Parameter	Standard Configuration
Operating weight	20,300 kg – 22,000 kg (depends on attachment and counterweight configuration)
Bucket capacity range	0.8 m³ – 1.2 m³ (general purpose rock bucket, heavy-duty bucket, and ditch cleaning bucket available as options)
Maximum digging depth	6,720 mm
Maximum digging radius	9,850 mm
Maximum dumping height	6,510 mm
Bucket breakout force	150 kN
Arm breakout force	114 kN
Swing speed	11.5 rpm
Maximum travel speed	5.5 km/h (high speed) / 3.5 km/h (low speed)

Long-reach boom and arm configurations (maximum digging depth up to 15 m) are also available for special applications such as river dredging and deep foundation construction. A full range of work attachments including hydraulic breakers, grapples, quick couplers, and augers are compatible with the 320DL to expand its application scope.

4. Structural Design & Durability

The 320DL is built to withstand the harshest working environments:

The X-type lower frame adopts a fully welded box structure made of high-tensile steel, with excellent torsional and bending resistance, eliminating structural deformation even under long-term heavy-load operations.
The boom and arm are designed with thickened high-strength wear-resistant steel plates, and reinforced plates are added at high-stress positions (boom foot, arm joint) to extend the service life of the working device to more than 15,000 working hours under normal use.
The heavy-duty undercarriage system is equipped with sealed and lubricated track links, hardened track shoes, and reinforced idlers and carrier rollers, which can adapt to rough terrain such as quarries, mountain construction sites, and muddy sites without frequent maintenance.
Optional full undercarriage guards and hydraulic cylinder guards prevent damage from rocks and debris in mining and quarry applications.

5. Operator Comfort & Safety

Caterpillar prioritizes operator experience and safety in the 320DL design:

The cab is certified to ROPS (Roll-Over Protective Structure) and FOPS (Falling Object Protective Structure) standards, providing maximum safety for operators in case of rollover or falling construction debris.
The fully sealed, pressurized cab reduces interior noise to below 75 dB(A), and the high-efficiency HVAC system with adjustable air outlets maintains a comfortable working temperature in environments ranging from -20°C to 50°C.
The adjustable air-suspension seat with lumbar support reduces operator fatigue during long shifts, and the ergonomically arranged control levers and large LCD monitor allow operators to grasp equipment status and adjust parameters easily.
The large glass area and narrow cab pillar design provide 360° panoramic visibility, effectively eliminating blind spots and improving operation safety.

6. Maintenance & Total Cost of Ownership

The 320DL is designed for easy maintenance to reduce downtime and operating costs:

All daily maintenance points (oil filler ports, filter positions, grease points) are arranged at ground-accessible positions, eliminating the need to climb on the upper frame for routine inspection, cutting daily maintenance time by 30%.
Extended service intervals: engine oil and filter change every 500 working hours, hydraulic oil and filter change every 2000 working hours, air filter replacement every 1000 working hours under normal dusty conditions.
Caterpillar's global after-sales service network provides 24/7 technical support and genuine spare parts supply, and the 320DL has an extremely high residual value, with a second-hand resale rate 15-20% higher than similar competing models after 5 years of use.

7. Typical Application Scenarios

The 320DL is a versatile workhorse suitable for a wide range of operations:

Urban and rural construction: foundation excavation, house demolition, material handling
Road and bridge construction: roadbed excavation, slope trimming, culvert digging
Mining and quarrying: ore loading, rock excavation, site clearing
Water conservancy projects: river dredging, reservoir construction, pipeline laying
Forestry and agriculture: land clearing, forest logging, farmland reconstruction

Summary

As a time-tested classic model in Caterpillar's excavator portfolio, the 320DL balances power, efficiency, durability and operating comfort perfectly. Whether working in extreme cold, high altitude, or heavy-duty quarry environments, it can deliver consistent and reliable performance, making it the first choice for contractors pursuing high productivity and low long-term operating costs.

Non flooded

No accident

Original product

Used Caterpillar 320DL Excavator

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