Where ever possible we like to avoid having to fit coolers to hydraulic systems. The cause of a hot system can be boiled down to one thing, wasted energy.
It is possible to waste energy in many ways and I would guess that the most common for hydraulic systems is blowing oil across a relief valve.
No hydraulic system is 100% efficient and any inefficiency will result in heat generation but often this can often be kept to a minimum and dissipated by convection and radiation. A large tank can help ensuring good air flow around its surfaces.
Pumps can play a significant role. Variable displacement pumps can provide the exact amount of flow needed without wasting fluid across the relief valve.
System design is critical in preventing heat generation by using unloading circuits, accumulators and correct sizing of components.
Regards
Bob
More at www.hydraulicbrain.com
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