Common faults of second-hand excavator equipment and their troubleshooting methods:
The engine is difficult to start or cannot start
Reason: insufficient battery power, fuel system problems, starter failure, internal engine failure, etc.
Troubleshooting method:
Check whether the battery power and cable connection are normal.
Check whether the fuel is sufficient and whether the fuel filter is blocked.
Check whether the starter is working properly and ensure that the electric start circuit is connected.
Check whether the engine has obvious damage or abnormal noise.
Power transmission system failure
Reason: transmission failure, clutch damage, drive belt wear, etc.
Troubleshooting method:
Check the transmission oil level and oil quality and replace if necessary.
Check whether the clutch is working properly and whether there is any abnormal noise.
Check whether the various components of the transmission system are worn, loose or damaged.
Hydraulic system abnormality
Reason: insufficient hydraulic oil, oil pump damage, hydraulic pipeline leakage, hydraulic oil pollution, etc.
Troubleshooting method:
Check the hydraulic oil volume and add oil if necessary.
Check whether the hydraulic oil is dirty and needs to be replaced.
Check whether the hydraulic pump and pipeline have oil leakage.
Check whether the hydraulic valve and control system are normal.
Hydraulic oil temperature is too high
Reason: hydraulic oil pump overload, oil circuit blockage, radiator dirty blockage, etc.
Troubleshooting method:
Check whether the hydraulic oil pump is overloaded and whether the working pressure needs to be adjusted.
Check whether the oil circuit is blocked and clean the oil circuit.
Check whether the radiator is dirty and blocked and clean the radiator if necessary.
Slow movement of bucket or arm
Cause: Insufficient hydraulic oil, hydraulic oil contamination, oil cylinder leakage, unstable hydraulic system pressure, etc.
Troubleshooting method:
Check the amount of hydraulic oil and add or replace it in time.
Check whether the hydraulic cylinder is leaking and check the integrity of the seal.
Measure the hydraulic system pressure of the second-hand excavator to check whether it meets the prescribed pressure standards.
Operating system failure
Cause: Electronic control system failure, sensor damage, loose circuit, etc.
Troubleshooting method:
Check whether the circuit and connector of the electronic control system are loose or damaged.
Check whether each sensor is working properly and replace it if necessary.
Use the diagnostic tool to read the fault code and confirm the specific fault point.
Wear or damage of external parts
Cause: Normal wear of bucket, blade, track and other parts.
Troubleshooting method:
Check whether the bucket and blade are severely worn and replace or repair them if necessary.
Check the tension of the track and whether there are cracks or looseness, and replace them in time.
Black smoke from exhaust
Reasons: Incomplete combustion of fuel, clogged air filter, fuel injection system problems, etc.
Troubleshooting methods:
Check whether the air filter is dirty and clogged, clean or replace it.
Check the injector and fuel supply system to ensure normal fuel injection.
Check the engine’s ignition system to ensure the correct ignition timing.
Excessive vibration
Reason: loose track, damaged engine bracket, unstable oil pressure, etc.
Troubleshooting method:
Check the tightness and wear of the track to ensure that the track is working properly.
Check the fixing bolts of the engine and transmission system to ensure that there is no looseness.
Check the stability of the hydraulic system to ensure that the oil pressure is normal.
The generator is not charging
Reason: generator failure, battery problem, loose wires, etc.
Troubleshooting method:
Check whether the generator is working properly and confirm the output voltage.
Check whether the battery connection is normal and replace the battery if necessary.
Check whether the wire connector is loose or corroded.
Troubleshooting of Heavy equipment second-hand excavator failures usually requires a comprehensive inspection of various systems, including the engine, hydraulic system, transmission system and electrical system. Second-hand excavators can be maintained and serviced regularly to detect problems in time to ensure the normal operation of the equipment and extend its service life.
