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Why We Use Oil Cooler In The Hydraulic System
Apr 05, 2017

Hydraulics has a lot of advantages when it comes to power transmission. However, hydraulics is not at all overall efficient. The fact is that every hydraulic machine needs to have high and continuous power input as well as power output and needs an oil cooler. The oil cooler is important in ensuring that the oil temperature is stable and within the standard limits.

Why Hydraulic Systems Overheat?

Inefficiencies cause the hydraulic fluid to overheat, which results in loss of input power. The loss of input power is converted into heat. Thus, the heat load of a hydraulic system is equal to its total power lost due to inefficiencies.

On that note, when the total input power that was lost is greater than the heat that was dissipated, it means the hydraulic system will overheat in the long run. Depending on the type of hydraulic system, the typically installed cooling ability is between 25 to 40% of input power.

What are Hydraulic Oil Coolers?

Hydraulic oil coolers are used for lubricating and quenching of oils as well as for heat transfer fluids. These are superior quality product that incorporates the best materials and hottest technological features.

This product is mainly used in the high risk of overheating damage in hydraulic components.  The fact is that overheating is one of the most common problems of hydraulic equipment and the oil cooler is the way to prevent it.

Types of Hydraulic Coolers

There are two principal types of hydraulic oil cooler. They differ in the cooling medium used which could either be water or air. The most commonly used type in places with adequate water supply is of course the water type.

Its advantages include being susceptible to ambient air temperature changes and being compact. On the other hand, the air type is lighter in construction and allows larger heat dissipation. However, its operation is sensitive to ambient air temperature changes.  

How Are Hydraulic Oil Coolers Used?

Basically, hydraulic oil coolers are used to prevent the oil in hydraulic systems from overheating. In hydraulic systems, overheating of the oil could lead to drop in the efficiency of the system. At the same time, it could also lead to excessive wear of system components resulting from reduced oil viscosity.

The oil’s chemical stability is measured in terms of its resistance to oxidation. When oxidation happens, oil molecules and oxygen combines and that sets off a chain of chemical reactions. Those chemical reactions create soluble and insoluble products causing degradation.

As a result, the oil becomes darker while its acidity and viscosity increases. Moreover, sludge and gums are deposited within the hydraulic system. Oxidation of the oil is greatly increased by high temperatures as well as the effects of water, air and some wear materials.

In order to prevent the unconstrained heating of the oil, hydraulic systems often use hydraulic oil cooler. With this device, the heat from the oil is allowed to be dissipated. To properly position the hydraulic oil cooler inside the hydraulic circuit, it’s important to identify heat generation’s major sources. With that, the device can be placed in the most beneficial location for effective dissipation of heat. 


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