Turn on the power supply for the whole machine
Many of US users may be used to hitting the car directly when they are normally started. In fact, our excavators also have a self inspection process when the power supply is connected to the car. All kinds of sensors on the excavator begin to work, collecting water temperature, oil temperature, fault information and so on to the computer board, and then on the display. The above display, some fault code will also be displayed at this time, different types of excavator self-test time varies, generally in about 10 seconds.
Excavator display
Start the engine and keep the idle
When starting the engine, you can stand in the engine to listen to the sound of the starting motor, identify whether the starting motor has abnormal sound, whether there is the sound of the tooth when starting, the motor power is strong, and the storage condition of the battery can be judged by the sound.
Excavator starting motor
At the same time, notice the failure indication of the display after starting, the engine oil pressure and the pressure of the hydraulic system will be set up after starting, and check the pressure is normal.
The condition of the engine will also be exposed when it is started. Whether the start time is in the normal range and the start time is too long indicates that some problems have appeared in the engine. Because the electric current is especially large when starting the motor, the service life of this machine will be greatly shortened.
Another particular note is to carefully observe the engine exhaust at startup, which refers to the exhaust status at the start of the cold car. If there is a small amount of black smoke at the start of the start, it is normal to disappear after the start of the start. This is due to the insufficient combustion of the diesel engine at the start of the start.
The excavator smoked black smoke
If it is white smoke that represents some problems in this engine, white smoke may be steam or diesel steam, and can be placed at the vent to see whether there is water or whether it is water vapor or diesel steam. There is water vapor in the engine with water channeling into the cylinder, with diesel steam indicating the engine's timing system has appeared, part of the diesel has not been burned to be discharged, the specific reasons for the next article will be analyzed, please look forward to!
Check the large pump and the engine
After starting, the valve is not urgent to operate, it is suggested that first listen to the large pump and engine whether there is abnormal sound, check the large pump and engine operation is smooth, whether there will be the knock cylinder and other noise, can also put hands on the large pump to feel if there is a disharmonious vibration.
After that, throttle can be added to the normal working condition and the above check will be carried out.
When the user is accustomed to starting the engine, it will increase the throttle to carry out the compound action test. In fact, the actual condition of the equipment can be reflected in the condition of idle speed or small throttle.
First, a single operation is carried out to check whether the working process of the oil cylinder and the bucket cylinder is smooth, the sound of the engine is smooth, and then the left and right revolving operations are carried out. When the two walking handles are pushed, walk for a distance to check whether there will be any deviation.
Check whether the arm can support the body, the hydraulic system is normal excavator idle speed can support the body, this time can operate on the single side of the walk, check whether the walking motor has a different noise.
After the operation of the idle speed, the oil temperature and water temperature of the excavator have reached the normal working temperature. At this time, the throttle can be transferred to the normal working condition, the operation of the compound action, check the fluency of the compound action, whether the engine will hold the condition of the car, it is best to test the load with the load operation. Check whether the hydraulic system is working properly, whether the engine is suppressing or not.
Check the whole state of the engine by hot car
In the case of the heat engine working for a period of time to check the temperature of the water and the temperature of the hydraulic oil is normal, observe the condition of the exhaust of the excavator when the load is working normally, and whether there is the occurrence of blue smoke, black smoke and white smoke.
In simple terms, the engine blue smoke is caused by the oil entering the combustion chamber. The black smoke is due to the insufficient combustion of diesel fuel. The white smoke is due to the unburned part of the diesel oil or the water flowing into the combustion chamber. The specific reasons will be revealed in the next article.
The test machine is a relatively high professional inspection project, is also the most capable of reflecting the real performance of a second-hand excavator of a check, if the user's own experience is not particularly rich advice in the trial of a professional accompanied by a professional, I hope you can buy a suitable used excavator.
