Purchasing a used Doosan excavator can be a strategic way to acquire high-quality equipment at a more affordable price. However, making a smart purchase requires you to be thorough in your evaluation. This guide will walk you through the essential steps, from inspecting the machine’s physical condition to evaluating its performance history, helping you make a confident and informed decision.

When buying a used Doosan excavator, focus on key aspects such as engine performance, hydraulic system, undercarriage, and maintenance history. A comprehensive inspection will help ensure you get a machine that meets your needs without unexpected costs.

Let’s now dive deeper into the critical areas you need to focus on when inspecting a used Doosan excavator. By the end of this guide, you’ll be equipped with the knowledge to make the right decision.

Assess the Machine’s Usage Hours

The number of operating hours on a used Doosan excavator can tell you a lot about its wear and tear, but it’s not the only factor you should consider. While low hours are generally a good sign, the machine’s maintenance and the types of work it has been used for matter just as much.

Check the machine’s operating hours on the hour meter. While fewer hours are often seen as a positive indicator, a well-maintained machine with higher hours can sometimes offer better value than a machine with low hours but poor maintenance.

You should always ask about the excavator’s operating history, not just the number of hours it has been used. For instance, if the machine has fewer than 5,000 hours but has been used in heavy-duty or high-stress tasks, it might require more maintenance than a machine with 6,000 hours that has been carefully maintained. Also, keep in mind that Doosan excavators are known for their durability, so a higher number of hours doesn’t necessarily indicate a worn-out machine if it has been properly maintained.

One key thing to look for is whether the excavator has had regular service intervals. If a machine has been regularly serviced but has higher hours, it may still be in excellent working condition.

Inspect the Engine and Transmission

The engine and transmission are the heart of any excavator. If these systems aren’t functioning optimally, the machine’s overall performance will be compromised. Before buying, ensure you thoroughly inspect both for signs of wear, leaks, and irregular performance.

Start the engine and listen for any unusual noises. Check the oil level and color, ensuring there are no leaks or signs of contamination. During a test drive, observe the transmission for smooth shifting and responsiveness.

The engine should start easily and run without excessive smoke or strange sounds. Look for any signs of oil leakage around the engine area and under the machine. Also, check the oil dipstick; clean oil should be amber-colored and free from contaminants. Dark or gritty oil could indicate engine wear or neglect.

During a test drive, shift the gears and observe how smoothly the transmission operates. Jerky or delayed shifts could indicate transmission issues that might need costly repairs. Be sure to test the full range of gears, as some issues may only appear when the machine is under load.

Additionally, examine the exhaust system for any signs of soot or excessive emissions, which could point to engine inefficiency or potential repairs down the line.

Inspect the Hydraulic System

The hydraulic system is responsible for powering the excavator’s arm, boom, and bucket. A smooth-operating hydraulic system ensures that your machine performs efficiently and without delay. Checking this system thoroughly is crucial before you make any purchase decision.

Check the hydraulic fluid levels and ensure that there are no leaks around the hoses, cylinders, or pumps. Test the arm, boom, and bucket for smooth operation without any delay or jerky movement.

Hydraulic systems are integral to an excavator’s performance, and any failure in this area can lead to significant downtime and repair costs. Start by checking the hydraulic fluid reservoir. The fluid should be clear and free of contaminants. Dark, milky, or foamy fluid can indicate contamination, which can lead to costly hydraulic repairs.

Next, operate the machine’s boom, arm, and bucket to test for smooth hydraulic movement. The movements should be quick, smooth, and responsive without jerks or hesitation. Listen for any unusual noises like grinding or whistling, which could indicate worn-out seals or hydraulic components.

Check all hydraulic hoses and cylinders for leaks or signs of damage. If you notice leaks, this could be a costly repair issue that will need immediate attention.

Examine the Undercarriage and Tracks

The undercarriage is one of the most important components of an excavator, as it bears the brunt of the machine’s movement and operation. A well-maintained undercarriage ensures stability and can significantly extend the lifespan of the excavator. Therefore, inspecting the tracks, rollers, and sprockets is a key part of the evaluation process.

Inspect the tracks for excessive wear, cracks, and any missing pads. Pay attention to the rollers and sprockets for signs of damage or rust, which can indicate a machine that has been poorly maintained or subjected to harsh working conditions.

The undercarriage is often the most expensive part to repair on an excavator. Look for visible signs of wear on the tracks, such as cracks, worn-out pads, or exposed metal. If the tracks are excessively worn, you may need to factor in the cost of replacement into your purchase price.

Next, check the sprockets, rollers, and idlers. These components should be in good condition, with minimal rust or wear. If you notice significant damage, it could indicate that the machine has been used in rough conditions or has not been regularly serviced.

Keep in mind that the condition of the undercarriage directly impacts the machine’s ability to move efficiently and safely, especially in tough working environments. If you’re purchasing a used Doosan excavator for heavy-duty work, ensure the undercarriage is in top condition.

Review the Maintenance History and Service Records

A comprehensive service history can provide insight into how well the machine has been maintained and whether it’s likely to have any hidden issues. Reviewing these records is one of the most reliable ways to gauge the overall health of a used Doosan excavator.

Ask for the full service records and maintenance logs. A well-maintained machine with a solid service history will likely be a more reliable investment than one without such documentation.

When reviewing the service history, look for details about regular oil changes, hydraulic system inspections, and any major repairs. A machine with an incomplete or missing service history should raise a red flag. If the machine has been neglected or has had long gaps between maintenance, it could be prone to issues that may not be immediately obvious.

Pay special attention to any major repairs or replacements that have been carried out, such as engine rebuilds or hydraulic system overhauls. This could indicate a history of significant wear or neglect. However, if these repairs were done professionally, it could also mean that the machine has been restored to good working condition.

Evaluate the Machine’s Overall Condition

Beyond the engine and hydraulics, evaluating the overall physical condition of the excavator is essential. A well-maintained exterior often indicates a machine that has been cared for and is likely to be in good working order.

Look for any visible damage like cracks, dents, or rust. Also, assess the condition of the cabin and the controls. A clean and well-maintained exterior typically suggests the machine has been well cared for.

Examine the exterior for any cosmetic damage. While scratches and dents may not affect the machine’s performance, cracks in the body or rust could be signs of more serious issues. A clean, well-maintained machine often indicates that the owner took good care of it overall.

Additionally, inspect the operator’s cabin for wear. Check that the controls are intact, and the seat is in good condition. If the cabin shows significant wear, it could indicate a rough working environment or poor treatment of the machine. A comfortable, functional cabin is key to operator safety and productivity.

Recommended Models for Used Doosan Excavators

When selecting a used Doosan excavator, certain models stand out for their reliability and performance in different types of construction projects. These models offer great value for money and long-term durability.

The Doosan DX150LC, Doosan DX225LC, and Doosan DX300LC are great choices. They offer solid performance, good fuel efficiency, and have a proven track record in various industries.

Doosan DX150LC: Ideal for smaller projects, the DX150LC is known for its fuel efficiency and versatility. It’s a perfect choice for urban construction, roadworks, and smaller excavation tasks.

Doosan DX225LC: The DX225LC is a reliable all-rounder for medium-duty tasks. Whether you need it for general excavation, grading, or heavy lifting, this model offers a good balance of power and efficiency.

Doosan DX300LC: This model is designed for large-scale projects. Known for its high lifting capacity and efficient operation, the DX300LC excels in heavy-duty tasks like mining and large-scale infrastructure development.

Resumen

Buying a used Doosan excavator requires careful evaluation of the engine, hydraulic system, undercarriage, and overall condition. With proper due diligence, you can secure a machine that will serve your business well for years to come. For expert advice and high-quality machines, feel free to contact us at HIXEN Machinery. We’re here to help you make the best choice!