Pressure is the result of resistance to flow. The single function of the pump is to take fluid from one place and put it somewhere else. I often hear the complaint that a pump isn’t putting out as much pressure as it should, implying that the pump is supposed to deliver pressure.Ī common assumption is that if the pressure is low, the pump must be bad. It is not uncommon to hear the terms used interchangeably, as though they are synonyms. If I had to pick a single concept that keeps most parts changers from becoming troubleshooters, it would be the failure to understand the difference between pressure and flow. With a filled-in arrowhead indicating liquid output. Hydraulic pump is represented by a circle, Usually, by the time I am called to help, a considerable amount of parts changing has occurred, and what began as something simple may have progressed into multiple issues which can be very time consuming to diagnose. While it is possible to repair the system this way, it is also possible to add a problem or two whenever a component is replaced that was not bad. What do you suppose the parts changer’s next course of action may be? If you said “change something else,” you would be correct.įrequently, the parts changing process continues until one of two things occurs: either the machine is repaired, and everyone rejoices, or the system is put into such a state that someone must be called. The trouble comes when a parts changer changes a part and it doesn’t fix the problem. It works fine whenever changing a part does in fact correct the issue. Someone with that level of experience is valuable, but it isn’t troubleshooting it’s parts changing. Now I don’t mean this in a derogatory way. They may or may not know exactly why this is, but they know from experience that replacing this part fixes the problem. These are people who have worked on and around hydraulic systems for so long that they know changing a specific part typically corrects a certain problem. The number of hydraulic troubleshooters I have come across, however, I can count on the fingers of one hand.įor the most part, I have encountered a lot of excellent hydraulic parts changers. As a hydraulic instructor and consultant, I have met thousands of people whose job consists, at least in part, of the maintenance and repair of hydraulic systems.
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