5 Reasons for Abnormal Noise in the Hydraulic System and How to Solve It
As an excavator operator, it is common to encounter abnormal noises in the hydraulic system. Such noises could be a warning sign of a problem that requires immediate attention. This article will help you understand the possible reasons for the noise in the hydraulic system and how to solve it.
- Air intrusion
One of the most common reasons for noise in the hydraulic system is air intrusion. When air invades the hydraulic system, it compresses and expands as it moves through the system, causing noise. This phenomenon is known as "explosion." To solve this issue, you can install an exhaust device on the hydraulic cylinder for exhaust. Another method is to make the actuator reciprocate several times in a fast full stroke to exhaust after driving.
- Poor quality of hydraulic pumpor hydraulic motor
The quality of the hydraulic pump or motor could affect the hydraulic system's noise. A low-quality hydraulic pump could have parts that wear easily, resulting in a gap that is too large, leading to insufficient oil flow and pressure fluctuations. The solution to this problem is to use good quality hydraulic pumps and motors. Regular maintenance and repairs are also necessary. If the gear tooth shape accuracy is low, the gear should be ground to meet the contact surface requirements. If the vane pump has trapped oil, replace it and correct the triangular groove of the oil distribution plate to eliminate trapped oil.
- Improper adjustment of the reversing valve
If the spool of the reversing valve moves too fast, it could cause reversing impact resulting in noise and vibration. The hydraulic valve spool is supported on the spring when working. When the frequency is close to the pulsation frequency of the hydraulic pump oil delivery rate or other vibration sources, it will cause vibration and noise. To solve this issue, you can adjust the reversing valve's throttling element in the control oil circuit to make the reversing smooth without impact. By changing the natural frequency of the pipeline system, you can change the position of the control valve or properly add an accumulator to prevent vibration and reduce noise.
- Unstable overflow valve
The overflow valve could be unstable due to improper cooperation between the slide valve and the valve hole, or the cone valve and the valve seat is stuck by dirt, the damping hole is blocked, the spring is skewed, or fails, etc. This could cause system pressure fluctuations and noise. To solve this issue, clean and dredge the nipple, check the overflow valve, and repair or replace it if any damage is found.
- Mechanical vibration
Mechanical vibration can also cause noise in the hydraulic system. A slender oil pipe with many elbows and not fixed could cause the pipe to shake when the oil flow rate is high. An unbalanced rotating part of the motor and hydraulic pump, poor alignment during installation, or loose coupling can generate vibration and noise. To solve this issue, it is recommended to separate the longer oil pipe and separate it from the wall of the machine tool, add support pipe clamps, adjust the installation accuracy of the motor and hydraulic pump, and reinstall the coupling to ensure that the coaxiality is less than 0.1MM.
In conclusion, don't panic when you hear abnormal sounds from the hydraulic system when operating an excavator. Investigate the issue by understanding the possible reasons and taking appropriate measures to solve the problem. Regular maintenance and repairs are necessary to ensure a well-functioning hydraulic system. Remember the above five points to keep the hydraulic system in excellent condition, leading to smooth and efficient excavator operations.
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