Author: Site Editor Publish Time: 2025-07-11 Origin: Site
In the fields of construction engineering, mining, etc., second-hand excavators are favored for their high cost performance. Many companies and individuals will purchase cheap used excavators for sale through used excavators supplier to save procurement costs. However, due to the long service life of the equipment and the large mechanical wear, second-hand excavators are more prone to various faults during use. Understanding these common faults and their repair methods will help improve the use efficiency and reduce maintenance costs.
The engine of a second-hand excavator usually works for a long time and is prone to power loss, difficulty in starting, and black smoke. This is mostly caused by wear of the injection system and reduced cylinder sealing.
The wear of the slewing motor and reducer will produce abnormal noise and weak rotation. If it is not maintained for a long time, the lubricating oil is contaminated or insufficient, which will also cause the gear wear to increase.
If the travel motor or track assembly is damaged, the machine will be unable to climb or deviate. Loose tracks and damaged rollers will also cause abnormal wear.
The electrical circuit of the second-hand excavator is aging, and display panel failure, false alarms or circuit short circuits often occur.
Replace hydraulic oil and filter elements regularly to prevent impurities from clogging the pipeline.
Check the oil pump and multi-way valve. If they are severely worn, they need to be replaced in time.
Repair or replace seals to ensure system sealing.
Clean the intake and fuel systems regularly to avoid carbon deposits and impurities.
Check the wear of the injection pump nozzle.
Replace aging cylinder gaskets to ensure cylinder sealing.
Regularly add or replace the lubricating oil of the slewing motor and walking reducer.
Replace severely worn gears, bearings or seals.
Check the track tensioning device to maintain the appropriate track tension.
Check whether the line connection is loose and whether the insulation is aged.
Replace the faulty sensor or control module.
Use waterproof plugs to reduce the risk of short circuit.
Regularly check whether the boom and dipper welds have cracks.
Repair or replace cracked parts to avoid fatigue damage.
When purchasing, it is recommended to check the equipment maintenance records in detail and evaluate the remaining life through the regular wholesale used excavators platform.
To help you better understand the performance of different models, the following is a comparison table of common large-tonnage second-hand excavators:
Model | ||
Operating Weight | 49 tons | 45 tons |
Engine Power | 304 kW | 257 kW |
Standard Bucket Capacity | 2.5 m3 | 2.1 m3 |
Maximum Digging Depth | 7.5 m | 7.1 m |
Hydraulic System Pressure | 35 MPa | 34.3 MPa |
Main Advantages | Powerful performance,suitable for heavy-duty operations,good parts compatibility | Excellent fuel efficiency,responsive control, easy maintenance |
Common Failures | Hydraulic pump leaks, engine power loss | Swing motor wear, travel reducer oil leakage |
Maintenance Difficulty | Medium to high, parts relatively expensive | Medium, parts readily available |
When purchasing, choose the appropriate model according to the construction intensity, budget and later parts supply.
Try to use a reputable used excavators supplier to avoid buying a machine with a major accident.
Inspect the operating status of the engine, hydraulic pump, and travel system on site.
Request equipment maintenance records to understand the repair history.
Prioritize models with clear maintenance cycles and sufficient parts supply.
Regularly replace the three filters (air filter, oil filter, fuel filter).
Pay attention to the quality and level of hydraulic oil and coolant.
Repair minor faults in time to avoid problems from expanding.
Whether you are a small or medium-sized contractor or an equipment rental company, choosing a well-maintained second-hand excavator can not only save procurement funds, but also ensure construction progress and quality. Equipment that has been strictly tested and regularly maintained can be close to new machines in terms of work efficiency and service life, reducing downtime losses caused by sudden failures. Through standardized maintenance, timely repairs, and regular inspections of key components, second-hand excavators will continue to play an important role in various complex working conditions and provide reliable support for the smooth progress of projects.
If you have purchasing needs, it is recommended to purchase in bulk through the wholesale used excavators platform. You can follow Huaiyun used excavators. We will provide you with consultation to help you get customized selection suggestions.
