There are various hydraulic devices which are found and the most common perhaps are the log splitter. This contains a four stroke engine, this powers the system and this engine has the hydraulic oil pump which is attached to it. There is a stream of high pressure oil which is sent to the valve and the valve allows the operator to actuate the cylinder which is used to split the log. The oil is held in a tank and that is used to feed the pump. There is also a filter which ensures the oil is kept clean.
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