CAT 320 Excavator Specifications: Everything You Need to Know
For over three decades, the Caterpillar 320 series has defined the 20-ton class of hydraulic excavators. In the 2026 global market, understanding the granular details of CAT 320 Excavator Specifications is essential for B2B importers and project managers who demand maximum uptime and technical precision. This comprehensive guide provides a deep-dive into the mechanical heart of this industry icon, analyzing why its specific engineering parameters translate into a market-leading ROI. Whether you are sourcing a Caterpillar 320D Premium or the latest Next-Gen model, these technical benchmarks define your project's potential.
Table of Contents
1. Engine Performance: The ACERT™ Power Plant
The core of the CAT 320 Excavator Specifications is the engine. Caterpillar utilizes its proprietary ACERT™ (Advanced Combustion Emissions Reduction Technology) to deliver high torque at low RPM. The Cat C4.4 or C7.1 engines are engineered specifically to balance power density with global emission compliance. In our 2026 audit of 95% new units, we found that the C4.4 engine provides a net power of 129 kW (172 hp) at 2200 RPM. This power-to-weight ratio allows the machine to maintain its breakout force even in high-resistance clay or rocky soils, a critical factor for contractors in Africa and the Middle East where soil density can vary significantly.
2. Hydraulic Flow and Pressure Mapping
If the engine is the heart, the hydraulic system is the nervous system. A key highlight in CAT 320 Excavator Specifications is the main pump flow rate. Featuring two variable displacement piston pumps, the system delivers a maximum flow of 429 L/min (113 gal/min). This high flow rate ensures that cycle times—swinging, dumping, and returning—remain under 12 seconds per bucket. Furthermore, the system pressure of 35,000 kPa (5,075 psi) provides the massive 150 kN of bucket digging force required for heavy excavation. When you buy a certified Caterpillar 320D Pro, our 120-point audit verifies that these pressures are within 95% of original factory specs.
3. Operational Dimensions and Working Ranges
The geometry of the CAT 320 allows it to operate in both open-site mass excavation and confined urban utilities. According to the CAT 320 Excavator Specifications, the machine features a 5.7m (18'8") heavy-duty boom and a 2.9m (9'6") stick. This configuration enables a maximum digging depth of 6,720 mm and a maximum reach at ground level of 9,860 mm. For B2B importers, these dimensions are crucial for calculating logistics; the shipping height of 2,960 mm ensures the machine fits into a standard flat-rack container or can be safely moved via RoRo vessel without removing the cab structure.
Figure 1: Internal engineering overview of the CAT 320 hydraulic and engine system, demonstrating factory-certified performance.
4. CAT 320 Series Technical Specification Matrix
| Technical Parameter | CAT 320 (Next Gen) | CAT 320D (Classic) | CAT 320 GC (Economy) |
|---|---|---|---|
| Engine Model | Cat C4.4 ACERT | Cat C6.4 ACERT | Cat C4.4 |
| Net Power (hp) | 172 hp | 148 hp | 145 hp |
| Operating Weight (kg) | 22,500 kg | 21,500 kg | 20,500 kg |
| Bucket Capacity (m³) | 1.19 m³ | 1.0 m³ | 1.0 m³ |
5. Fuel Management and Eco-Mode Intelligence
Modern CAT 320 Excavator Specifications prioritize operational cost reduction. Caterpillar's integrated engine and hydraulic control system (IEHC) adjusts engine speed and pump flow to match the specific task load. For example, during light-duty grading, the machine automatically lowers RPM without losing hydraulic precision. In our field tests in Shanghai, we observed that the Next-Gen CAT 320 can reduce fuel consumption by up to 25% compared to the older 320D series while maintaining the same production volume. This makes sourcing a used, 95% new certified CAT 320 a smarter financial move than purchasing a new machine from a lower-tier brand.
6. Frequently Asked Questions (FAQ)
Q: How does the CAT 320 breakout force compare to other 20-ton models?
A: The CAT 320 generally leads its class with a bucket digging force of approximately 150 kN, providing superior performance in mass excavation and heavy soil handling.
Q: Is the maintenance of a CAT 320 easy for global export markets?
A: Yes. One of the best CAT 320 Excavator Specifications is the grouped maintenance points at ground level and the massive global availability of original Caterpillar filters and spare parts.
Q: What is the fuel tank capacity for long-shift operations?
A: Most CAT 320 models feature a 345-liter (91.1 gallon) fuel tank, allowing for full 10-12 hour shifts without the need for on-site refilling.
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