Common Faults And Repair Methods for Used Excavators

With the continuous development of construction and mining, excavators have become a vital piece of engineering machinery. Due to their competitive price and excellent performance, used excavators are increasingly popular among businesses and individuals. However, due to differences in age and maintenance, used excavators are bound to experience various faults during use. This article will analyze common faults and repair methods for used excavators from multiple perspectives to help users better maintain their equipment and improve efficiency.

Common Mechanical Failures and Troubleshooting Methods for Used and Used Excavators

Difficulty Starting the Excavator Engine

Cause Analysis:

Clogged fuel system or poor fuel quality

Starter circuit fault

Low battery charge

Clogged air filter

Maintenance Recommendations:

Clean or replace the fuel filter to ensure smooth fuel flow

Check battery voltage and replace if necessary

Check the starter and related circuits to repair short circuits or poor contact

Clean the air filter to ensure smooth air intake

Hydraulic system oil leakage and insufficient pressure

Cause Analysis:

Aging or cracked hydraulic lines or connectors

Worn or damaged hydraulic pump seals

Poor hydraulic oil quality or insufficient oil

Maintenance Recommendations:

Regularly inspect hydraulic lines and replace any aging immediately

Replace hydraulic pump seals and repair leaks

Use qualified hydraulic oil, replace the hydraulic oil regularly, and keep the oil clean

Sluggish or weak movement of the boom and bucket

Cause Analysis:

Insufficient hydraulic system pressure

Damaged hydraulic cylinder piston seal

Faulty or clogged control valve

Repair Recommendations:

Adjust hydraulic system pressure to ensure it meets design requirements

Replace hydraulic cylinder seal to restore sealing performance

Clean or replace control valve to ensure unobstructed hydraulic oil flow

Travel System Abnormality

Cause Analysis:

Travel motor malfunction

Severe wear on travel hub or chain

Brake system failure

Repair Recommendations:

Check travel motor electrical and hydraulic systems and repair any malfunctions

Replace damaged hub and chain to ensure smooth travel

Adjust or replace brake system components to ensure safe operation

Used Excavator Electrical System Troubleshooting

Electrical System Failure to Start

Cause Analysis:

Battery aging and failure

Poor or broken wires

Damaged starter relay

Repair Recommendations:

Test battery voltage and replace aged batteries

Check all electrical connectors and repair any breaks or shorts

Replace the starter relay to restore normal electrical control

Abnormal instrument panel indicator lights

Cause Analysis:

Internal instrument panel circuit malfunction

Damage to sensors or loose wiring

Repair Recommendations:

Check the instrument panel circuitry and replace damaged components.

Test sensor function to ensure accurate signal transmission.

Slow control system response

Cause Analysis:

Control module software malfunction

Aging electronic control components

Repair Recommendations:

Update or reset the control module software using a diagnostic tool.

Replace aged electronic components to ensure control sensitivity.

Key Points in Used Excavator Maintenance

Regularly Change Lubricating and Hydraulic Oil

Maintaining clean and sufficient lubricating and hydraulic oil levels is essential for the proper operation of the excavator's mechanical and hydraulic systems. It is recommended to replace them every 500 hours or according to the manufacturer's recommended interval.

Check and Replace Filters

The air filter, fuel filter, and hydraulic oil filter should all be inspected and cleaned or replaced regularly to prevent impurities from entering the system and causing malfunctions.

Hydraulic System Pressure Testing and Adjustment

Regularly test the hydraulic system pressure using specialized equipment to ensure it meets design standards. If pressure is insufficient, check for leaks and pump conditions.

Lubrication and Tightening Inspection of the Travel System

The lubrication and tightening of the chain, hub, and gears directly affect the excavator's travel performance. Lubricant levels and component wear should be checked regularly.

Electrical Circuit Safety Inspection

Regularly check the insulation and connector tightness of electrical circuits to prevent short circuits and poor contact.

How to Choose a High-Quality Used Excavator Supplier

Supplier's Equipment Source and Warranty

Choose a reputable used excavator supplier to ensure the equipment is legally sourced and offers a certain period of warranty service, ensuring purchase risk is manageable.

Supplier's After-Sales Service System

Comprehensive after-sales service, including technical support, spare parts supply, and repair guidance, can effectively extend the life of the equipment.

Supplier's Professional Technical Capabilities

Professional used excavator suppliers typically have extensive experience in mechanical inspection and repair, and can provide customers with accurate equipment assessments and maintenance recommendations.

Customer Reviews and Industry Reputation

Reviewing a supplier's customer feedback and industry reputation can help you assess its overall strength.

Used Excavator Maintenance Fault Summary Table

Conclusion

Used excavators are essential equipment in construction projects. Correctly identifying and promptly repairing common faults can significantly improve equipment efficiency and service life. When choosing a used excavator, be sure to contact a professional used excavator supplier to ensure high-performance, guaranteed equipment.

If you are looking to purchase or wholesale high-quality used excavators, please contact Jiecheng Used Excavator Supplier at guo@machbro.com or visit our website for more details: https://www.machbro.com.