Advantages of Hydraulic Oil Coolers

A hydraulic oil cooler does not add new power to a system. By keeping oil temperature in a suitable range, it helps the system do the work it is already meant to do more steadily and for longer. This article covers the benefits a cooler provides without exaggeration, and under which conditions they apply.

Contribution to oil life

As oil temperature rises, oxidation and aging generally speed up. The oil can thicken, leave deposits and lose its protective properties. Keeping the temperature within the manufacturer's range helps preserve the oil change interval. The actual change interval depends on the type of oil, the contamination level and the operating conditions.

Contribution to seal and pump life

Seals and hoses are elastomer materials; at excessive temperatures they can harden and lose their flexibility, which leads to leaks. When the oil gets too hot and thins out, the lubricating film in pumps and valves weakens and internal leakage increases. Keeping the temperature in balance reduces the load on these components.

Stable operation

Oil viscosity is sensitive to temperature. When the temperature keeps rising and falling, cylinder speed, pressure and response time can change as well. By limiting temperature swings, a cooler helps the machine behave more predictably.

More predictable maintenance

Having the temperature under control also makes maintenance planning easier. Oil sampling, filter condition checks and leak inspections can follow a more predictable schedule, because sudden heat-related deterioration is less likely. Maintenance can then be carried out at predefined intervals rather than after a failure occurs.

Another benefit is that the machine can keep working in demanding conditions. Ambient heat rises in summer, in an enclosed machine compartment or during long shifts. A properly sized cooler helps keep the oil from exceeding its temperature limit in these conditions.

Fewer unplanned stops

Failures caused by overheating often show up during peak working hours. Keeping the temperature under control lowers the likelihood of such failures. A cooler alone does not eliminate the risk of failure; maintenance, filtration and the right choice of oil are also required.

For the advantage to hold

• The cooler capacity must be selected to suit the heat load of the system; an undersized cooler will not deliver the expected benefit.
• Working pressure and temperature must stay within the limits of the cooler.
• The fins must be kept clean of dust and oil buildup; a blocked surface reduces heat rejection.
• Airflow must not be obstructed.

In the aluminum bar-plate construction used in Safkan oil radiators, the separator design in the oil channels creates turbulence and improves heat transfer. The maximum working pressure of the fan-cooled models is 15 bar; for exact values, rely on the model PDF datasheets.

Summary

• Oil: when temperature stays in balance, aging slows and the service life of the oil is preserved.
• Seals and hoses: the risk of hardening and leaks caused by excessive heat is reduced.
• Pump and valves: the lubricating film is preserved, and internal leakage and wear load are reduced.
• Operation: temperature swings are limited and the machine behaves more predictably.
• Continuity: the chance of heat-related unplanned stops decreases.

None of these gains is automatic; they matter together with the right selection, correct installation and a clean operating environment. Thinking of the cooler as one protective layer is a more accurate way of giving it a realistic place in the system.

Next step

You can read how a cooler works in the circuit in the article on the working principle of cooling in hydraulic systems, and what happens without cooling in why oil cooling systems are necessary. To see the products, visit the fan-cooled radiators page; for a model that suits your application, contact us.