When purchasing a used excavator, there are several key factors to consider to ensure equipment performance, reliability and return on investment:
1. Machine working time
Check the working hours: The working hours directly affect the degree of wear of the excavator. Generally speaking, the higher the working hours, the more serious the wear of the various parts of the equipment.
Understand the use history of the machine: is it used in a heavy-duty working environment or a relatively easy job.
2. Engine condition
Engine inspection: The engine is one of the core components of the excavator. Check whether the engine has oil leakage, abnormal noise, difficulty in starting, etc. You can check whether there are abnormal oil stains or carbon deposits by observing the appearance of the engine.
Engine brand and model: Branded used excavator engines are generally more reliable, and repairs and parts are more readily available.
3. Hydraulic system
Hydraulic system inspection: The hydraulic system is one of the core power sources of the excavator. Check the quality of the hydraulic oil, whether there is leakage in the oil circuit, whether the oil cylinder is leaking, and the operation of the hydraulic pump and motor.
Test the operating function: During the on-site test, observe whether each hydraulic action (such as bucket, arm, rotation, etc.) is smooth, responsive, and whether there is abnormal noise or lag.
4. Track and travel system
Track wear degree: Check whether the track is obviously worn, broken or damaged. The service life of the track usually depends on the use environment and maintenance.
Travel system inspection: Check whether the travel system (such as travel motor, shock absorber, transmission gear, etc.) operates smoothly, whether there is noise or jamming.
5. Structure and frame
Check the frame and structure of the machine: Check whether the fuselage, arm, bucket and other parts have cracks, deformation or welding marks, especially after high-intensity work, fatigue damage may occur.
Check the bucket and accessories: the degree of wear of accessories such as buckets and breaker hammers, and whether they need to be replaced.
6. Operating system and electrical system
Electrical system inspection: Check the battery, starting system, cable connection, etc. to ensure that the electrical system is working properly. Electrical failure may affect the startup and stable operation of the equipment.
Display and instrument panel: Check whether the display of the instrument panel is normal and whether all indicator lights are working. The appearance of abnormal indicator lights may be a signal that there is a problem with the machine.
7. Historical repair and maintenance records
Understand the maintenance history: Check the repair and maintenance records of the used excavator equipment to see if there has been a major overhaul or accident history. Regularly maintained equipment generally performs better and has a lower risk of failure.
Repair and maintenance records: Confirm the repair records of the equipment with the seller to see if there is a history of replacement of important parts, such as the engine, hydraulic pump, etc.
8. Hydraulic oil and fuel system
Check the hydraulic oil and fuel system: Check the cleanliness of the oil and confirm whether there is leakage or contamination. The good operation of the hydraulic oil and fuel system is essential, and poor oil quality may cause system damage.
9. Test operation
On-site test: It is recommended to test the machine on site and observe the operating status of the equipment. By operating the excavator, check whether its movements are flexible and whether the work is stable. The test items include functions such as rotation, digging, and lifting.
Pay attention to sound and vibration: Is there any abnormal sound, vibration or leakage when the machine is running
10. Price and market comparison
Market research: Understand the market price of equipment of the same model and age, and evaluate whether the price of the used excavator is reasonable. Equipment with too low a price may have hidden problems.
Additional costs: In addition to the purchase price, additional costs such as transportation, registration, and insurance should also be considered.
11. Brand and model
Brand influence: Equipment from well-known brands is usually of better quality and has more complete after-sales service.
Model adaptability: Confirm whether the equipment model is suitable for your work needs and whether there are enough accessories and maintenance services.
12. After-sales guarantee
After-sales service: Some second-hand excavator dealers will provide a short warranty period. Check whether it provides protection and whether subsequent repairs and technical support can be obtained.
Through the comprehensive evaluation of the above aspects, you can better judge whether the second-hand excavator is worth buying and avoid buying equipment with major problems.