Whether it is an excavator owner or an operator, they all hope that their excavators are full of power when they work. But some people say that after working for a period of time, their excavators become very slow, which not only affects the operator's working mood, but also delays the construction period and affects profits. If the excavator moves slowly, we need to find the reason based on the detailed situation. Below, Liugong's excavator parts supplier will inform you of several reasons that constitute the excavator's slow motion:

Slow movement of the excavator refers to the phenomenon of slow walking or turning speed and weakness when the excavator is operating or turning.

Classification of the disadvantages of slow excavators:

    1. A single action is slow

       It is assumed that the speed is relatively slow when operating a single operation such as walking, turning, raising and lowering arms, and retracting the bucket. There are generally three reasons for this situation, which are detailed as follows:

       1. Disadvantages of the component itself

       That is to say, the performance of the moving parts is poor or the performance is poor during the implementation process, or the pressure of the safety valve of the relevant component is too low. The excavator's hands can be disassembled and cleaned to see if there is jamming or oil leakage, or the pressure test is aborted. If it is normal, the maintenance will be suspended after the shortcomings are determined.

       2. Disadvantages of the conduction process

       That is, shortcomings occur in the command transmission process, which hinders the transmission of command signals. At this point, you can focus on checking the pump, pressure sensor and multi-way valve to see if there are any shortcomings.

       3. Operating system shortcomings

       That is, the excavator's command issuing system is shortcomings, resulting in the failure of the signal to be issued. This situation is generally more complicated and requires professional maintenance guidance. The operator or maintenance person can carefully check whether the relevant pilot oil circuit and solenoid valve oil circuit are defective.

2. The whole excavator moves slowly

       Assuming that the entire excavator (complete vehicle) moves slowly, Liugong excavator parts suppliers think you need to check:

       1. Hydraulic system

       The hydraulic system is one of the power systems of the excavator. Assuming that the whole excavator moves slowly, it should be checked whether the hydraulic system can be maintained on time and the hydraulic oil can be changed when denied. Outdated hydraulic oil not only affects the working effect of the excavator, but also corrodes the hydraulic circuit and hydraulic components of the excavator. At the same time, check whether the hydraulic oil circuit and the oil return filter element are blocked. If so, the oil circuit should be cleared, and the parts should be replaced in serious cases.

       2. The power of the initiator is too low

       The initiator is also one of the power systems of the excavator. The output power of the engine is too low, and the lack of power will cause the output power to be low, and then the excavator will hold back the vehicle, making the excavator vehicle slow. In addition, check whether there is black smoke in the motive. If the fuel injector is severely worn, it will cause the engine power to drop and the excavator will move slowly.

       3. Hydraulic pump

       The lack of hydraulic pump output can also cause the excavator to move slowly. This is one of the transmission shortcomings of the hydraulic system. The operator can enter the service diagnosis system to stop the relevant pressure test to see if the excavator moves slowly due to the lack of output flow of the hydraulic pump.

3. The cold engine is normal but the warm engine moves slowly

       When the excavator is working normally when the cold machine is working, but the hot machine is slow, you need to check:

       1. Check the oil

       Check whether the fuel used can meet the requirements of the excavator. If the fuel has not been changed for too long, or the fuel is too dirty, the fuel needs to be changed. At the same time, assuming that the oil inlet filter is attached with copper scraps, it will scratch the main pump and cause wear. At this time, the filter should be cleaned.

       2. The filter element is blocked

       Blockage of the filter element will cause the oil path to be unsuccessful. Therefore, check whether the pilot filter element, the oil return filter element, and the oil suction filter element are blocked during inspection. If the filter element is clogged, the clogging material needs to be cleaned up, and the filter element needs to be replaced in serious cases.

       3. Main pump conditioner

       Since most of the daily work of the excavator is dealing with the soil, the piston of the main pump conditioner is easily stained with oil, causing the piston to block, and the pump pressure of the main pump is reduced, the output power is reduced, and the excavator moves slowly. Therefore, when the excavator is routinely inspected and maintained, it is necessary to clean up the oil pollution in each part.

       Slow excavator movement is actually a signal to the operator and the owner. When the excavator is slow, you must carefully check the shortcomings of the excavator, and repair from these aspects to let your excavator return to "young" as soon as possible.

The supplier of Liugong excavator parts summarizes the reasons for the slow action of the excavator:

       1. The single slow action of the excavator refers to the slowness of the excavator during a single operation such as walking, turning, raising and lowering arms, and recovering the bucket. The common reasons are:

       ① The overflow pressure of related components of the excavator is too low.

       ② Defects of pump pressure sensor.

       ③ Disadvantages of solenoid valve.

       2. The slow motion of the whole excavator/the whole vehicle means that no matter what the excavator does, the whole vehicle is very slow and weak. Common reasons are:

       ① The engine speed is not too low or the engine power is insufficient.

       ② The output flow of the hydraulic pump of the excavator is too small.

       ③ The excavator CPU, upper and lower pressure sensors, solenoid valves and wiring are abnormal.

       ④ Abnormal hydraulic components of the excavator, abnormal oil circuit or flow loss.

       ⑤ The pump pressure value of the excavator is too small, lower than the normal value, causing the excavator to move slowly.

       ⑥ The pump components of the excavator are worn out. This problem usually occurs on second-hand or long-running excavators. The inspection method is to drain the oil to see if there are iron filings or other impurities in the oil. If there is an iron filing magazine, it means that the pump components are worn.

       ⑦ Lack of pilot pressure or defects of PC-EPC solenoid valve.

       ⑧ Circuit problems. (This problem is common with Kobelco excavators. Kobelco excavators have more circuit problems).

       3. The excavator works slowly in the morning

       Under normal circumstances, the slow action of the cold car is caused by the pressure and flow of the pump valve group of the excavator being lower than the standard value. Therefore, after this shortcoming, a pressure gauge is required to measure the pressure value of the pump valve group. If the pressure value is lower than the standard, it is necessary to debug. To measure flow, professional maintenance equipment is required.

       4. The excavator's heat engine moves slowly

       Common reasons for disadvantages are:

       ① The hydraulic oil is too dirty, and the oil needs to be changed. Check the oil filter when changing the oil to see if there is any copper scraps. If there are copper scraps, it means the main pump of the excavator is worn and needs to be disassembled and checked.

       ② The pilot filter element, the oil return filter element, and the oil suction filter element are blocked.

       ③ Replace the oil and filter element if it fails.

       ④ There is sludge on the servo piston of the main pump regulator, and the swash plate cannot be adjusted. The main pump always works at a small displacement and lacks flow.

For more information about excavator parts, please visit Chuanna Industrial (www.kscna.cn). I hope this article "Liugong Excavator Parts Tell You What Causes Excavator Slow Motion" is helpful to everyone. If you still don’t understand, you can directly leave a message or consult Chuanna Hydraulics National Service Hotline 15850333149, we will solve your doubts as soon as possible!