RICHARDSON, writing in Scientific Lubrication recently, stressed the need for strict attention to the cleanliness of the fluids used in hydraulically operated automatic transmissions with special reference to storage conditions, cleaning materials and the care of filters. In the same number of the journal Chisholm briefly described methods of oil filtration in general when discussing the maintenance of industrial hydraulic systems. It will be found too that the majority of articles and booklets dealing with hydraulic fluids and systems—industrial, automotive and aeronautic—pay attention to the potential effect of impurities, their exclusion and removal, in greater or lesser detail. Similarly diagrams of typical hydraulic circuits will usually show permanent wire mesh screens or strainers in the oil reservoir on the suction side of the pump and sometimes below the filler plug while by‐pass filters are generally located at some point in the circuit after the pump. (By‐pass filters owe their popularity to the fact that should the element become completely clogged the flow of hydraulic oil is not thereby interrupted).
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