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Hydraulics Question Why do hydraulic systems overheat?

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Another often overlooked situation that causes hydraulic systems to overheat are, obstructions or blockages in the system, dirty or clogged hydro oil filter(s), using a tool that is designed for a closed system or an open system on a pump unit or hydraulic power source or pump of the opposite design (open or closed system operation). Also, check to be sure no restrictor/flow limiters have been installed on the system or tools, or that any reducer "washers" are at any fittings, couplers or other connection points.

Also, all hydraulic oil is hydroscopic, meaning that it will absorb water over time and thus become less effective and contaminated. This is why it is good to change the hydraulic fluid/oil at least once a year to avoid such problems, even if the tool hasn't been used all that much.

Posted on Jul 07, 2009

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Heating of hydraulic fluid in operation is caused by inefficiencies. Inefficiencies result in losses of input power, which are converted to heat. A hydraulic system's heat load is equal to the total power lost (PL) through inefficiencies and can be expressed as: PLtotal = PLpump + PLvalves + PLplumbing + PLactuators If the total input power lost to heat is greater than the heat dissipated, the hydraulic system will eventually overheat.

Posted on Aug 27, 2008

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