Common Problems and Effective Solutions for Used Doosan Excavators

In the used excavator market, used Doosan excavators are a popular choice for many engineering contractors and equipment buyers due to their affordability, flexible operation, and easy access to parts. The Doosan DX series, such as the Doosan DX220, DX225, and DX300 models, perform stably in earthmoving, road construction, municipal engineering, and mining operations. However, used Doosan excavators inevitably experience some wear and tear. Understanding potential malfunctions and mastering solutions is crucial for reducing maintenance costs and improving construction efficiency.

Shanghai Lingyi will provide an in-depth analysis of common problems and effective solutions for used Doosan excavators, helping users better assess equipment condition, improve purchasing and usage safety, and enhance return on investment.

Slow or Weak Hydraulic System Movement

The hydraulic system is the core of the excavator. If a used Doosan excavator experiences slow movement or weak digging power, common causes include:

Contaminated or deteriorated hydraulic oil

Worn hydraulic pump

Stuck main valve or abnormal overflow pressure

Solutions:

Regularly replace high-quality hydraulic oil and filter elements; check and adjust the overflow pressure; if severe pump wear is found, consider repair or replacement. For used Doosan excavator maintenance, hydraulic system maintenance is a crucial step in reducing future failures.

Difficulty Starting the Engine or Insufficient Power

This is common in older second-hand Doosan digger. Common causes may include:

Fuel system blockage

Worn fuel injectors

Insufficient air intake or turbocharger problems

Solutions:

Clean the fuel lines, check the fuel injector atomization and replace if necessary; regularly replace the air filter element; keep the cooling system clear to prevent overheating and engine shutdown. Good long-term engine maintenance can significantly reduce fuel consumption and maintain continuous power output.

Abnormal Slewing Noise or Stoppage

One of the more common problems in original used Doosan excavators, usually caused by lack of oil in the slewing bearing, gear wear, or insufficient lubrication.

Handling Methods:

Add grease

Check the slewing ring gear clearance

If wear is severe, it is recommended to replace the slewing bearing.

For Doosan excavator repair, maintenance of the slewing mechanism directly affects operational continuity. Regular maintenance is recommended to avoid further damage.

Rapid Chassis Wear and Weak Travel Power

After long-term operation in quarries or construction sites, the chassis (tracks, track chains, and support rollers) of Doosan excavators will gradually wear out.

Solution:

Regularly check the track tension; replace the track chains or drive wheels promptly if wear is severe; avoid prolonged high-speed idling; and reasonably plan the work path on the construction site to extend the chassis life.

Electrical System Malfunctions or Frequent Instrument Alarms

After prolonged use of a used Doosan excavator, aging wiring or poor contact of connectors can cause alarm prompts, screen flickering, or button malfunctions.

Countermeasures:

Clean the wiring connectors and check the battery condition; replace aging wiring harnesses if necessary. Keeping the electronic control system dry can effectively prevent recurring malfunctions.

Summary: Used Doosan Excavators Remain a Cost-Effective Choice

Overall, used Doosan excavators still offer excellent value for money. They perform well in earthmoving, municipal construction, and general excavation and loading tasks. As long as you conduct a thorough inspection before purchasing, choose a reputable used Doosan excavator supplier, and perform regular maintenance, you can extend the equipment’s lifespan and reduce repair costs.

Advantages that appeal to search users include:

Reasonable price and quick return on investment

Ample parts supply and low maintenance costs

Simple operation, suitable for various working conditions

For users planning to purchase a used Doosan excavator, it is recommended to focus on evaluating the hydraulic, engine, chassis, and electronic control systems, addressing potential problems in advance to ensure stable productivity during construction.