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Hydraulic Filter Element Replacement Standards for Wet Spray Vehicles
Release time:
2026-02-25
Source:
Author:
Summary:
The hydraulic filter element is the core protective component of the wet spray carriage’s hydraulic system; its operational status directly affects the reliability and service life of the equipment. Establishing scientific replacement criteria can both ensure system cleanliness and help avoid unnecessary maintenance costs.
I. Standards for Changing Time Periods
Basic replacement cycle
Establish basic replacement criteria based on equipment operating time:
- Oil return filter element: Per operation 500 Must be replaced hourly.
- High-pressure filter element: Per operation 500 Hour or 3 Replace every month
- Oil-absorbing filter element: Per operation 1000 Hour or 6 Replace every month
- Pilot filter element: Per operation 500 Hour or 6 Replace every month
Special operating condition adjustment
Cycle Adjustment Under Different Working Conditions:
- First-time use of the new device: 250 Perform the first replacement within one hour.
- After major equipment overhaul: 200 Complete the replacement within the hour.
- Dusty environments: All filter element replacement cycles are shortened. 30%
- Continuous high-intensity operation: shortened replacement cycle 25%
II. Differential Pressure Indication Replacement Criteria
Automatic indication and judgment
Determine the replacement timing by relying on the differential pressure indicator:
- The blockage triggers the transmitter to send a signal: 24 Must be replaced within the hour.
- The mechanical indicator has entered the red zone: Arrange for replacement immediately.
- The pressure difference exceeds 0.35MPa It is recommended to replace it as soon as possible.
- Visually inspect the filter housing for deformation: Stop the machine immediately and replace it.
Manual detection method
Criteria for judgment when no indicator is present:
- The temperature of the filter cartridge housing has abnormally risen.
- The system's operating noise has noticeably increased.
- The actuator's operating speed has decreased.
- The oil temperature has abnormally risen above the standard value.
III. Standards for Oil Product Testing and Replacement
Laboratory analysis
Replacement criteria based on oil analysis:
- Pollution level exceeds NAS 9 Level: Replace all filter cartridges immediately.
- Moisture content exceeds 0.1% Replace and troubleshoot the cause of water inflow.
- Acid value reaches that of new oil 2 Double: System cleaning and filter cartridge replacement
- Excessive metal particle content: Replace and inspect worn components.
On-site rapid testing
Simple Judgments in Daily Maintenance:
- Dark, murky oil color: Immediately inspect and replace the filter element.
- The oil has a burnt smell: The filter element must be replaced.
- Visible solid impurities: Replace and inspect the source of system contamination.
- Oil emulsification: Thoroughly inspect and replace the filter element.
IV. Requirements for Replacements in Special Circumstances
Replace after failure
Special requirements after equipment maintenance:
- After hydraulic pump maintenance: all filter elements must be replaced.
- After removing the oil cylinder: Replace the corresponding system filter element.
- After the pipeline ruptures: Thoroughly clean and replace the filter cartridge.
- After the system is flooded with water: Replace the filter cartridge and treat the oil.
Seasonal replacement
Replacement requirements for a specific period:
- Before winter arrives: Inspect and replace all filter cartridges.
- Equipment that has been idle for a long period: Must be replaced before activation.
- After an environmental change: Inspect and confirm replacement requirements.
- After oil change: Work 50 Hourly filter element inspection
V. Replacement Operation Specifications
Preparatory work
Essential preparations before replacement:
- Confirm that the new filter cartridge model matches the original.
- Prepare dedicated tools and cleaning supplies.
- Thoroughly clean and replace the work area.
- Prepare oil collection containers and wiping materials.
Operating steps
Standard replacement procedure:
1. Shut down the machine and completely release system pressure.
2. Clean the filter element housing and surrounding area.
3. Remove the old filter cartridge and inspect for any remaining residue.
4. Confirm that the new filter cartridge seal is intact.
5. Install the new filter element and tighten it to the specified torque.
6. Clean the site and check the sealing performance.
6. Inspect and confirm after replacement.
Installation Quality Inspection
Necessary verification after replacement:
- Confirm that the sealing ring is installed correctly and without distortion.
- Check that there are no leaks at the connection points.
- Confirm that the fixing bolts have reached the specified torque.
- Record the replacement time and operating parameters.
System Operation Validation
Functional testing after replacement:
- Start the device and observe the pressure reading.
- Check the system for any unusual noises.
- Confirm that all actuators are functioning properly.
- Record operating parameters and establish a file.
VII. Preventive Maintenance Recommendations
Daily monitoring
Key monitoring points for daily maintenance:
- Check the status of the differential pressure indicator for each class.
- Record system pressure fluctuations.
- Monitor changes in the operating sound of the device.
- Observe the color and transparency of the oil.
Regular testing
System inspection according to the prescribed cycle:
- Conduct rapid oil testing monthly.
- Samples are collected quarterly and sent to the laboratory for analysis.
- Record filter cartridge replacement history data
- Analyze the pattern and characteristics of filter element clogging.
Conclusion
The scientific replacement of hydraulic filters in wet spray carts is a crucial aspect of equipment maintenance. By establishing multi-dimensional evaluation criteria and taking into account the actual operating conditions of the equipment, we can not only ensure the cleanliness of the hydraulic system but also achieve economically reasonable maintenance costs. It is recommended to develop detailed replacement procedures, equip with necessary testing devices, enhance training for maintenance personnel, and establish a comprehensive maintenance record-keeping system. Through standardized maintenance management, we can significantly improve equipment reliability, extend its service life, and provide strong support for construction projects.
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