Precautions After Replacing the Hydraulic Pump on an Excavator
2013-07-09
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(1) Always watch for abnormal phenomena
Abnormal noise, vibration, or abnormal signals from the monitoring system must have a cause. As soon as an abnormality is found, immediately obtain the circuit diagram and follow it to trace the cause, carefully observing whether the abnormal phenomenon is caused by a temporary error. Assess whether the machine needs to be stopped for handling. Factors such as pressure, load, temperature, time, startup, and shutdown all contain possible causes of abnormal phenomena. These should be analyzed and studied item by item during normal operation.
(2) Do not apply load immediately after starting the hydraulic pump
After startup, the hydraulic pump must run without load for a period (about 10 to 30 minutes). Especially when the ambient temperature is very low, a warm-up process is even more necessary so that the hydraulic circuit circulates normally before load is applied, and the operating condition should be confirmed.
(3) Observe changes in oil temperature
Pay attention to checking the changes in maximum and minimum oil temperatures, and determine the relationship between oil temperature and the external ambient temperature. Only in this way can you know whether the cooler capacity and reservoir capacity match the surrounding conditions and operating conditions, and only then can there be clues for troubleshooting the cooling system.
(4) Pay attention to the noise of the hydraulic pump
A new hydraulic pump has little initial wear and is easily affected by air bubbles and dust. Poor lubrication at high temperatures or excessive load under operating conditions can all cause adverse consequences and make the hydraulic pump produce abnormal effects.
(5) Pay attention to checking the displayed values of instruments
Always observe the pressure gauge readings of the hydraulic circuit, the vibration and stability of pressure switch indicators, etc., so as to detect as early as possible whether the hydraulic circuit is operating normally.
(6) Pay attention to observing the machine's movement (for modified pumps)
Improper hydraulic circuit design or poor component manufacturing is not easily detected in the initial stage of use, so special attention should be paid to the movement states exhibited under various operating conditions.
(7) Pay attention to adjustments within each valve
Fully understand the use of pressure control valves, flow control valves, and directional control valves, and pay special attention to the adjustment ranges and limits. Otherwise, incorrect adjustment will not only damage the machine but also pose a threat to safety.
(8) Check the condition of the filter
The filter in the circuit should be removed and cleaned regularly, and the condition of the filter screen and the contaminants adsorbed on it should be checked. Analyze the quality, quantity, and size of the contaminants. In this way, the degree of contamination in the circuit can be observed, and even the source of contamination can be inferred from it.
(9) Regularly check changes in the hydraulic oil
Every one or two months, check and analyze changes in the deterioration, discoloration, and contamination degree of the hydraulic oil to ensure the normal operation of the hydraulic transmission medium.
(10) Pay attention to leakage in the piping
Whether the piping of the hydraulic device is good or not can be seen after a period of operation. Check whether there is oil leakage and whether the piping is loose.
(11) Pay attention to the operating condition during the first three months of operation of a new machine
During the operation period of a new machine, attention should be paid to checking the operating condition, such as maintenance of components, whether screws are loose, whether the oil temperature rises abnormally, whether the hydraulic oil deteriorates quickly, and whether the operating conditions meet the regulations.
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