Cavitation is the term used to describe the formation of gas cavities within a liquid. In a hydraulic system, this is normally taken to mean formation of vapor bubbles within the oil. But it can also mean dissolved air coming out of solution in the oil.
Cavitation erosion occurs when gas cavities in the oil collapse (implode) under pressure, in … Read more
Hydraulic filter elements divide into two main categories: surface and depth. Surface filters typically have a wire mesh construction like, for example, a suction strainer. Depth filters are constructed from a matrix of fibres. Cellulose (paper), plastic, glass and metal can all be used to construct a depth filter.
Man-made glass fibers are smaller and more uniform than naturally occurring … Read more
A recent client consulted me about the hydraulic oil turning black, smelling bad and depositing varnish in the Hitachi EX5600 mining shovels he is responsible for. These are BIG diggers. Twin Cummins QSK50s with 4 main pumps (250 GPM) on each engine. Bucket capacity is 40 tons. And a 240 ton dump truck is loaded in 6 passes, in around … Read more