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Analysis of Possible Causes for Unusual Noises During Pumping in Wet Spray Vehicles
Release time:
2026-03-04
Source:
Author:
Summary:
Abnormal noises during the pumping process of wet spray carts are common signs of malfunction. These unusual sounds often indicate that a certain component of the equipment has developed an issue. Accurately identifying the type of abnormal noise and analyzing its root cause is crucial for preventing equipment damage and ensuring construction safety.
I. Abnormal Noise in the Hydraulic System
Abnormal noise from the hydraulic pump
Characteristics and Causes of Unusual Noises from Hydraulic Pumps:
1. Continuous " Buzzing " Noise: Usually caused by insufficient oil intake; check for clogged filter elements or low oil levels.
2. Regular " Click " Sound: May be due to piston damage or bearing wear.
3. Sharp " Hissing " Sound: Typically indicates severe internal leakage or seal failure.
4. Irregular " Boom " Sound: Possibly cavitation; check the sealing of the oil suction line.
Unusual noise from the valve assembly
Abnormal sounds generated by the control valve assembly:
- Impact noise during switching: failure of the cushioning device or improper parameter settings.
- Continuous " Squeak squeak " Sound: Valve core sticking or spring fatigue
- Intermittent " Plop plop " Sound: Air mixed into the hydraulic fluid.
- A harsh, piercing squeal: throttling port blockage or parameter misalignment.
II. Abnormal Noise from Mechanical Transmission
Abnormal noise from the pumping mechanism
Abnormal noise from the mechanical components of the pumping system:
1. Metallic friction noise: Scratches on the inner wall of the delivery cylinder or piston wear.
2. Regular knocking sound: Excessive clearance at the joint.
3. A harsh scraping sound: S Interference between the valve and the hopper liner.
4. A dull crushing sound: Foreign objects have been mixed into the concrete.
Unusual noise from the transmission system
Abnormal power transmission component:
- Periodic " Giggle " Sound: Bearing damage or poor lubrication
- Continuous " Rustling " Sound: Gear wear or abnormal clearance.
- Irregular " Dong dong " Sound: Coupling damage or misalignment.
- Sharp " Creaking " Sound: Lack of lubrication or dry friction between components
III. Unusual Noises from Structural Components
Abnormal noise from the boom system
Abnormal noises during arm operation:
1. " Creak " Sound: Insufficient lubrication or wear at the hinge joint.
2. " Bang bang " Sound: Internal leakage in the hydraulic cylinder or failure of the cushioning device.
3. " Click! " Sound: Cracks in structural components or loose connections
4. " Buzzing " Sound: Resonance phenomenon, check the fastening condition.
Chassis noise
Unusual noises when the equipment is moving or supported:
- During the turn " Kaka " Sound: Steering mechanism failure
- During support " Creaking " Sound: Uneven or damaged leg support.
- Driving " Roaring " Sound: Tire abnormality or suspension malfunction
- During braking " Scream " Voice: The braking system needs adjustment.
4. Unusual noises from the electrical system
Unusual motor noise
Abnormal sounds from the electric system:
1. High frequency " Buzzing " Sound: Phase failure or unstable voltage in the power supply.
2. Regular " Tap tap " Sound: Bearing damage or rotor eccentricity
3. Harsh " Scream " Sound: Overload or poor heat dissipation
4. Intermittent " Crackling " Sound: Insulation damage or poor contact
Abnormal noise from the control system
Abnormal noise from control components:
- of the relay " Click " Sound: Contact arcing or poor contact
- of the solenoid valve " Buzzing " Sound: Coil aging or loose fastening
- of the transformer " Huff. " Core loosening or abnormal load
- of the inverter " Squeak squeak " Sound: Filter capacitor failure
V. Diagnostic Methods for Unusual Noises
Auscultatory localization
Accurate diagnosis using a stethoscope:
- Distinguish the source location: hydraulic system, mechanical transmission, or structural components.
- Identifying sound frequencies: High-frequency sounds typically originate from hydraulic systems, while low-frequency sounds often come from mechanical components.
- Identify sound patterns: Periodic sounds typically come from rotating components, while non-periodic sounds usually originate from impact components.
- Compare with normal voice: Establish a standard voice database.
Operating Status Analysis
Combined with equipment operating status judgment:
1. The relationship between abnormal noises and rotational speed
2. The relationship between abnormal noises and load
3. The relationship between abnormal noises and temperature
4. The relationship between abnormal noises and pressure
VI. Preventive Measures
Daily maintenance
Basic measures for preventing abnormal noises:
- Regularly check the lubrication condition of each component.
- Replace worn parts promptly.
- Keep the hydraulic system clean.
- Regularly tighten connecting components.
Regular check-up
Systematic Inspection Plan:
1. Conduct a comprehensive equipment inspection every month.
2. Quarterly specialized testing
3. Annual Major Maintenance and Service
4. Establish equipment health records
7. Emergency Handling
On-site handling
Emergency measures to take when an unusual noise is detected:
- Immediately reduce the load and operate.
- Check the oil level and oil pressure.
- Listening to determine the location of the sound source
- Prepare for the shutdown inspection.
Maintenance Decision
Determine the handling plan based on the nature of the unusual noise:
1. Slight abnormal noise: Record observations, schedule maintenance.
2. Obvious abnormal noise: Arrange inspection and repair as soon as possible.
3. Severe abnormal noise: Stop the machine and perform maintenance immediately.
4. Dangerous abnormal noise: Immediately shut down and evacuate.
Conclusion
Unusual noises from wet spray trucks’ pumping systems are important early warning signs of equipment failure and require timely attention and proper handling. By establishing a systematic process for identifying and addressing abnormal noises, equipping the necessary detection tools, and enhancing operator training, we can effectively prevent serious equipment failures from occurring. It is recommended to build a database of equipment sounds, recording typical noise characteristics and troubleshooting experiences to provide reliable support for equipment maintenance. At the same time, we should place great emphasis on preventive maintenance, regularly inspecting vulnerable components to ensure that the equipment remains in optimal working condition at all times.
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