CAT 320D vs. CAT 330D : comment choisir la bonne pelle d'occasion ?
Release time: 2025-09-02
Table of Contents
The CAT 320D and CAT 330D are representative models in Caterpillar (CAT) mid-sized hydraulic crawler excavator series, commonly used in various earthworks, construction, and mining projects. Although these two machines may look similar at first glance, there are several key differences between them. This article will compare the CAT 320D and CAT 330D’s key specifications and help you make an informed decision when purchasing used equipment.
Comparison Table: CAT 320D vs. CAT 330D
| Parameter | CAT 320D | CAT 330D |
|---|---|---|
| Engine Power | 140 HP | 200 HP |
| Poids en ordre de marche | 20,000 kg | 30,000 kg |
| Max Digging Depth (Reach) | 6,480 mm | 7,320 mm |
| Hydraulic Flow Rate | 250 L/min | 300 L/min |
| Capacité du godet | 0.8 – 1.4 cubic meters | 1.0 – 1.9 cubic meters |
| Max Digging Depth | 6,480 mm | 7,320 mm |
| Fuel Efficiency | Higher | Lower (due to higher power) |
| Typical Applications | Medium to light projects (e.g., foundation work) | Heavy-duty projects (e.g., large-scale earthworks) |
CAT 320D & CAT 330D Power and Performance Differences
Engine Power: The CAT 320D is equipped with a 140 HP engine, while the CAT 330D has a 200 HP engine. This means the CAT 330D provides significantly more power, making it better suited for heavy-duty tasks such as large-scale earthworks and demolition projects. On the other hand, the CAT 320D’s lower engine power offers better fuel efficiency, making it ideal for medium to small-scale projects where cost-effectiveness is a priority.
CAT 320D & CAT 330D Work Efficiency and Application
Typical Applications: The CAT 320D is primarily used for medium to light tasks like earthworks and foundation construction. Its efficiency and stability are suitable for most standard construction projects. The CAT 330D, however, is designed for heavy-duty tasks. Its larger engine power and more robust hydraulic system allow it to handle large-scale earthmoving and demolition projects with ease.
Work Range: The CAT 330D hydraulic crawler excavator offers a better digging depth and working range than the CAT 320D, which is particularly advantageous for tasks requiring deeper digging or more complex excavation. For projects that need to dig deeper or handle tougher materials, the CAT 330D is the better option.
CAT 320D & CAT 330D Size and Load Capacity
Operating Weight: The CAT 320D has an operating weight of approximately 20,000 kg, while the CAT 330D’s operating weight is around 30,000 kg. While the CAT 330D is larger, this gives it a stronger load capacity, ensuring better stability in rough or uneven terrain. For projects requiring heavy earthmoving or larger-scale demolition, the CAT 330D’s stability and load-bearing ability are advantageous.
CAT 320D & CAT 330D Hydraulic System and Work Efficiency
The CAT 330D comes with a more powerful hydraulic system (300 L/min vs. 250 L/min), which makes it more efficient during heavy-duty operations. When quick digging or heavy lifting is required, the CAT 330D’s hydraulic system delivers higher working pressure, improving work efficiency. The CAT 320D, with its smaller hydraulic flow, is ideal for lighter tasks that don’t require as much power.
CAT 320D & CAT 330D Fuel Efficiency and Cost
While the CAT 330D offers more power and higher work efficiency, its larger engine consumes more fuel. In contrast, the CAT 320D has better fuel efficiency, making it a cost-effective choice for projects with a limited budget or for those focusing on lighter tasks. If budget constraints are a concern and the project involves mainly light-duty operations, the CAT 320D provides better value for money.
Tips for Buying Used Equipment
When purchasing a used CAT 320D or CAT 330D, here are some important factors to consider:
Check Working Hours and Maintenance Records: The number of working hours indicates how often the machine has been used. Typically, machines with fewer than 10,000 hours of operation hold more value. Also, review the maintenance records to ensure the machine has been regularly serviced.
Hydraulic System and Engine: Inspect the hydraulic lines for oil leaks and listen for any abnormal engine sounds or excessive wear. The hydraulic system and engine are critical components, so it’s essential to ensure they are in good working condition.
Tracks and Undercarriage: Check for excessive wear on the tracks and ensure the undercarriage is level. Regular replacement of tracks and undercarriage parts will help avoid unexpected breakdowns.
Equipment Source and Seller Reputation: Choose a reputable seller for used equipment to ensure the machine has a legitimate history and that they provide accurate maintenance reports and inspection certificates.
Conclusion
In summary, the CAT 320D and CAT 330D have distinct advantages depending on the size and requirements of your project. The CAT 320D is ideal for medium and small-scale projects, offering better fuel efficiency and lower maintenance costs, while the CAT 330D is more suited for heavy-duty operations, providing more power and higher work efficiency. When purchasing used excavator equipment, it’s essential to consider your project needs, budget, and the condition of the equipment to make the best choice.
