When choosing a used excavator, the inspection of several key components is particularly important to ensure the performance and reliability of the excavator. The following components require special attention:
Hydraulic System
In the process of use, hydraulic pumps, hydraulic cylinders, hydraulic valves, etc., are prone to leakage, damage and other problems, resulting in unstable operation of the excavator and reduced work efficiency. When buying a second-hand excavator, it is necessary to check whether the various components of the hydraulic system are intact, and maintain and replace them in time when problems are found.
Engine
The engine is an indispensable core component of the second-hand excavator. In the process of use, the engine is prone to oil leakage, water leakage, overtemperature and other problems. If these problems are not dealt with in time, they will have a significant impact on the use and performance of the excavator, and even lead to engine damage. During the test, pay attention to whether the engine is noisy, observe whether the power is strong, and whether there is a phenomenon of speed loss. At the same time, check whether the exhaust system is normal and whether there are abnormal phenomena when starting. When buying a second-hand excavator, it is necessary to check the health of the engine to ensure that it is operating normally.
Track System
In the process of use, the track wheel, track plate, track rod and other parts are easy to wear, break, fall off and other problems, resulting in the second-hand excavator can not run smoothly or produce vibration, noise and other problems. Check the wear of the drive wheel, guide wheel, load wheel, belt wheel and track, and whether the chain is original. At the same time, check whether the speed of the two walking motors is consistent during the walking process, if the speed is different, there may be a problem. When buying a second-hand excavator, it is necessary to check whether the various components of the track system are in good condition to ensure that they can operate normally.
Cab
The cab is the working space of the second-hand excavator operator, and the air conditioning, heating, sound and other equipment inside the cab are easy to fail, and even have safety problems. When buying a second-hand excavator, it is necessary to check whether the equipment in the cab is complete and functional to ensure the safety and comfort of the operator.
Lubrication System
Lubrication system is an important guarantee for the normal operation of second-hand excavator. During the use of the second-hand excavator, the lubrication system is prone to problems such as loose throttle, loose tubing and low sensitivity of the oil pump, resulting in inadequate lubrication and affecting the normal use of the excavator. Therefore, when buying a second-hand excavator, it is necessary to check whether the various components of the lubrication system are normal to ensure that the excavator is lubricated in place.
The arms of the excavator
Observe whether there are cracks or welding marks on the upper and lower arms of the excavator. If there is a crack, it may mean that the machine has been used in a bad working environment. There may be serious damage and such a machine may be difficult to maintain even if bought back.
Rotary Motor
Observe if the rotation is strong and if there is noise during the rotation. If there is noise, it is necessary to check which part is emitted, and observe whether there is a gap in the rotating chassis.
Oil Hydraulic Pump
The hydraulic pump is the power component of the hydraulic system, check whether there is a crack or oil leakage, and observe whether it is strong and noiseless during the test.
Electric System
Ensure that all components of the electrical system function properly and are not damaged or aged.