When is the right time to change your filters? There are two schools of thought on this subject.
The first says that filters should be changed according to equipment manufacturer guidelines, which are typically based on hours of service. The drawback with that approach is that the filters may or may not need to be changed at that time. If they are overdue for a change, then you have compromised the efficiency of your machine and risked the messy aftermath of a clogged filter; if they do not need to be changed, you have wasted some of the useful life of the filter. In some cases, maintenance will use their own experience with the equipment to develop a schedule for changing the hydraulic filters that makes better use of overall filter life.
The other approach is to use an element condition indicator. An indicator measures the pressure drop across the filter. Once it reaches a critical level (e.g., 2 bar for a filter that has a 3 bar pressure drop when it is at capacity), the indicator reveals that you need to change the filter. Filters are then changed when the element indicators reveal that the filter is getting near capacity. Some maintenance departments and companies take this a step further and continuously monitor the pressure drops across the filters, which not only indicates when a hydraulic filter needs to be changed but can reveal impending failure within the system and enable the technicians to track down the cause. This requires a significant upfront investment in transducers and sensors, a reliable system to log the data, and someone who knows how to extract useful information from that data.
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