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Analysis of the Causes of Excessive Noise in the Hydraulic System of a Truck-Mounted Pump
Release time:
2026-05-15
Source:
Author:
Summary:
Hydraulic system noise is an important indicator of equipment operating condition, and abnormal noise often signals potential faults or malfunctions in the system. Accurately identifying the source of the noise and analyzing its root causes is crucial for ensuring normal equipment operation and extending service life.
I. Noise Analysis of Hydraulic Pumps
Cavitation
Cavitation noise caused by air entrapment in the hydraulic pump:
1. The oil suction line is not sealed properly, allowing air to be drawn in.
2. Oil-absorbing filter element is clogged, resulting in excessive inlet oil resistance.
3. The hydraulic fluid has excessive viscosity and poor flowability.
4. Pump speed is too high, exceeding the allowable range.
Mechanical noise
Internal mechanical failure of the pump casing:
Bearing wear, excessive clearance
Wear on the mating surfaces between the swashplate and the cylinder block
Loose connection between the plunger and the slipper
Drive shaft bending or damage
II. Noise Analysis of Hydraulic Valves
Relief valve noise
Abnormal noise from the pressure control valve:
Pilot spool wear leads to poor stability.
Pressure-regulating spring fatigue leads to increased vibration.
Spool sticking causes high-frequency whining.
Excessive back pressure in the return oil line causes impact.
Directional valve noise
Abnormal symptoms of directional control valves:
1. The electromagnet fails to engage smoothly and emits a buzzing sound.
2. Spool reversal impact, resulting in knocking noise.
3. Throttling port blockage, abrupt change in flow velocity
4. Reset spring fatigue, abnormal operation
III. Noise of Actuating Elements
Hydraulic cylinder noise
Abnormal noise during cylinder operation:
Piston seal damage causes leakage noise.
Worn guide bushing, metallic friction noise
Buffer failure, end-of-travel impact noise
Piston rod bending, resulting in unstable operation.
Hydraulic motor noise
Abnormal motor operation:
1. Wear of the oil distribution shaft increases internal leakage.
2. Bearing damage, resulting in unstable operation.
3. Plunger jamming causes impact.
4. Housing resonance, producing a buzzing sound.
IV. Noise from Auxiliary Components
Piping System Noise
Pipeline Vibration and Abnormal Noises:
Pipe clamp loosening, pipeline vibration
Sudden change in pipe diameter, resulting in turbulence.
Excessive bends increase resistance.
Pipeline aging and reduced elasticity
Fuel Tank and Accessories Noise
Fuel tank system anomaly:
1. The fuel tank resonates, emitting a buzzing sound.
2. Air filter clogged, intake noise
3. Low oil level, pump cavitation noise
4. Improper return oil pipe positioning, impact noise
V. Noise Caused by Hydraulic Fluid Issues
Fluid contamination
Oil quality issues:
Air entrainment in the hydraulic fluid causes cavitation noise.
Contaminants clog the throttling orifice, causing a sudden change in flow velocity.
Oil emulsification leads to reduced lubricating performance.
Oil degradation leads to reduced foam resistance.
Abnormal oil temperature
Effect of temperature on noise:
1. When the oil temperature is too low, viscosity increases.
2. Excessive oil temperature leads to reduced viscosity.
3. Oil temperature fluctuations lead to unstable performance.
4. Cooling system failure, temperature out of control
VI. System Design and Installation Issues
System matching issue
Design and installation defects:
Excessive misalignment between the pump and motor
Excessive spacing of pipeline supports
Component selection mismatch
System natural frequency resonance
Installation quality issues
Installation process defects:
1. Improper sealing installation leads to air leakage.
2. Insufficient bolt tightening torque
3. Incomplete pipeline cleaning
4. Weak foundation for component installation
VII. Noise Diagnosis and Treatment
Noise Identification Method
On-site diagnostic steps:
Using a stethoscope to locate the sound source
Analysis of Noise Frequency Characteristics
Compare with the normal operating sound
Record the patterns of noise variation
Handling Measures
Targeted solutions:
1. Inspect and eliminate cavitation.
2. Replace worn parts
3. Optimize system operating parameters
4. Strengthen equipment maintenance and upkeep
Conclusion
Excessive noise in the hydraulic system of vehicle-mounted pumps is the result of multiple interacting factors and requires systematic analysis and comprehensive mitigation. By establishing a robust equipment monitoring system, strengthening routine maintenance and servicing, and optimizing system operating parameters, system noise can be effectively reduced. It is recommended to develop detailed equipment maintenance procedures, equip facilities with the necessary diagnostic tools, and enhance operator training to ensure that equipment consistently operates in optimal condition. At the same time, emphasis should be placed on the collection and analysis of noise data to continuously improve equipment management practices, thereby providing strong assurance for the safe and reliable operation of the equipment.
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Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
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