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The main idea is that to move a cylinder faster you sometimes need more oil flow than the pump alone can deliver at that moment. An accumulator is designed for that purpose: it stores hydraulic energy by keeping some oil under pressure in a gas-chaged or spring-loaded chamber, and when demand spikes, it releases that stored oil into the line. That quick burst of additional fluid increases the instantaneous flow to the cylinder, producing a faster motion without waiting for the pump to supply all of it.

This component is placed in parallel with the pump and cylinder so it can supplement the pump’s output when needed. The reservoir merely holds extra oil for the system; it doesn’t provide a rapid energy release. The filter’s job is to clean the oil, protecting components, and the valve controls where the oil goes and at what rate, but it doesn’t supply extra hydraulic energy itself.