Key characteristics of this frequently occurring fault:
1. Low trigger threshold: It can be triggered by everyday fluctuations such as slight blockage of the suction filter, low oil level in the tank, or slight air leakage in the suction pipe, without requiring severe wear of core components.
2. High concealment: In the early stages, it is not accompanied by obvious abnormal noises, only manifesting as insufficient system pressure and slow operation, which can easily be misdiagnosed as a relief valve malfunction.
3. Wide coverage: It occurs frequently in various vane pump applications such as industrial machine tools, injection molding machines, and construction machinery, and is not limited by the service life of the equipment.
Core causes of high frequency:
1. Hydraulic oil has not been changed for a long time, and impurities in the oil quickly clog the suction filter. The oil filter is the primary cause of this malfunction.
2. Failure to check the oil tank level during routine maintenance and insufficient oil replenishment leads to the oil inlet being exposed above the liquid surface, directly causing cavitation.
3. Long-term aging of the seals in the oil suction line causes micro-leaks that are difficult to detect with the naked eye, continuously disrupting the negative pressure environment of the pump chamber.
Key Points for Quick Troubleshooting and Repair
1. Prioritize checking the oil tank level and oil suction filter, clearing blockages, and replenishing oil to the oil level mark. 80% of these malfunctions can be resolved quickly.
2. Inspect all joints in the oil suction line, replace aging seals, and completely eliminate air inlets.
If the above operations are ineffective, disassemble and check if the impeller is stuck or if the distributor plate is misaligned. Avoid excessive disassembly to prevent secondary damage.
