Maintenance methods and lifespan extension techniques for hydraulic pumps
Check the pump body seals for leaks weekly and replace any that are aged or damaged.
Release Time：
2025-05-30
Hydraulic Pump Maintenance Methods and Lifespan Extension Techniques
I. Core Aspects of Hydraulic Oil Management
Oil Selection and Replacement
Use only the hydraulic oil grade specified in the equipment manual; mixing different brands or types of oil is prohibited.
Replace hydraulic oil every 2000-4000 hours; replace immediately if the oil deteriorates (e.g., turns dark black).
When adding oil, filter it through a filter with a mesh of 80 or more, to prevent impurities from entering the system.
Oil Temperature and Cleanliness Control
Maintain operating temperature between 15~65℃; if the oil temperature exceeds 65℃, stop and cool.
Maintain the oil level in the tank above the marked line to prevent air intake and cavitation.
Regularly clean the oil tank and filter element; the oil filtration accuracy should be less than 25μm.
II. Key Component Maintenance Strategies
Bearing Maintenance
Select C3/C4 clearance bearings; prioritize C4 clearance for high-temperature conditions.
Mandatorily replace bearings every 10000 hours; replace immediately if discoloration or scratches are found on the rollers.
Use three-layer labyrinth seals for bearings to reduce the risk of contaminant ingress.
Sealing System Protection
Check the pump body seals for leaks weekly; replace any aged or damaged seals promptly.
Before starting the plunger pump, fill it with clean oil through the drain port.
III. Operating Standards and Monitoring
Start-up and Operating Requirements
When starting, pulse several times, operate at low pressure for 5~10 minutes before loading.
Avoid long-term operation under excessive pressure; maximum pressure is only allowed for short periods.
Condition Monitoring Technology
Measure bearing temperature weekly (warning value 80℃), and check vibration values monthly.
Abnormal noise (such as sharp sounds), a 30% drop in flow rate requires immediate shutdown and troubleshooting.
IV. Environmental and System Matching Optimization
Anti-pollution Design: Gear pumps are preferred for applications with impurities; install a high-precision filter at the oil suction port.
Load Adaptation: Variable plunger pumps are suitable for scenarios with frequent pressure fluctuations and can automatically adjust displacement.
Extreme Environments: Preheat hydraulic oil in low-temperature environments; use stainless steel pump bodies in seawater applications.
Comprehensive Measures for Lifespan Improvement
Reserve 10%~20% power margin for the motor to prevent overload and burnout.
Conduct a comprehensive check of pipeline tightness every quarter to prevent leaks.
Use synthetic-based special lubricating grease; the filling amount should be 30%~50% of the bearing space.
Through the above systematic maintenance, the lifespan of the plunger pump can be extended to more than 18000 hours, and the lifespan of the gear pump can reach 10000 hours with proper maintenance.
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